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The Saudi Arabian Distribution Code

1. The Saudi Arabian Distribution Code DOC2 Operational Planning DOC2 1 Introduction DOC2 1 1DOC2 Operational Planning a sets out the operational planning procedure and typical timetable for the co ordination of outage requirements for Plant and apparatus to be provided by Users to enable DSP s to operate the Distribution System and b Specifies the information to be provided by Users to DSP s to allow it to comply with the Saudi Arabian Grid Code SAGC DOC2 1 2The means of providing the information to DSP s and its confirmation includes any non transitory written form or any other suitable means of electronic transfer which enables the recipient to retain information DOC2 1 3In order for the DSP s to fulfil the requirements of DOC2 it should be noted that the information set out in the Saudi Arabian Grid Code SAGC to be provided by the TSP will form the basis of operational planning under DOC2 DOC2 2 Scope DOC2 2 1DOC2 applies to the following Users of the Distribution System a Major Customers connected to the Distribution System where DSP s considers it appropriate b Embedded Generating Plant connected to the Distribution System c Customers with CHP and Customers with Auto production DOC2 3 Provision of Information DOC2 3 1 Information on Embedded Generating Plant not subject to Central Dispatch including Customers with CHP and Customers with Auto production shall be provided where specified di
2. DGC1 Introduction While each part of the Distribution Code presents the rules and provisions relating specifically to that part the Distribution General Conditions DGC presents provisions which are of general application to all parts of the Distribution Code DGC2 Scope The General Conditions apply to all Users of the Distribution System DGC3 Implementation DGC3 1 DGC3 2 The Distribution Service Provider Licence imposes a duty upon DSP s to implement and enforce the Distribution Code In order to do this DSP s may need access across boundaries services and facilities from Users or to issue instructions to Users for example to isolate or disconnect Plant or apparatus It is considered that these cases will be exceptional and it is not therefore possible to envisage precisely or comprehensively what DSP s might reasonably require in order to carry out its duty All Users are required to abide by the Distribution Code and also to provide the DSP s rights of access services and facilities and to comply with such instructions as may be reasonably required to implement and enforce the Distribution Code 13 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DGC4 Unforeseen Circumstances DGC4 1 If circumstances arise which the provisions of the Distribution Code have not foreseen DSP s shall to the extent reasonably practicable in the circumstances consult promptly and in good f
3. The Saudi Arabian Distribution Code DOC6 3 10 Within one month of receiving the System Test proposal DSP s shall submit a report to the Test Proposer which shall contain a proposals for carrying out the System Test including the manner in which it is to be monitored b an allocation of costs between the affected parties the general principle being that the Test Proposer will bear the costs and c such other matters that DSP s consider appropriate an outline of the procedure to be followed and the proposed test schedule and advice of any costs DOC6 3 11 the proposal report shall be submitted to all those who received a notice under DOC6 3 4 DOC6 3 12 If the proposal report or a revised proposal report as agreed between DSP s and the Test Proposer is approved by all recipients the System Test can proceed DOC6 3 13 At least one month prior to the date of the proposed System Test DSP s shall submit to all recipients of the proposal notice a programme which in DOC6 shall be called a Final Test Programme stating the switching sequence and proposed timings a list of those staff involved in carrying out the System Test including those responsible for site safety and such other matters as DSP s deem appropriate DOC6 3 14 The final test programme shall bind all recipients to act in accordance with the provisions contained within the programme in relation to the proposed System Test DOC6 3 15 At the conclusion of
4. DOC2 Operational Planning DOC3 Demand Control DOC4 Operational Communications and Liaison DOC5 Event Reporting DOC6 System Tests DOC7 Monitoring Testing and Investigation DOC8 Safety Co Ordination DOC1 Demand Forecasting DOC1 1 Introduction DOC1 1 1In order for DSP s to operate the Distribution System efficiently and to ensure maximum system security and system stability there is a need for those Users specified in DOC1 2 to provide loading and generation output information to DSP s DOC1 1 2D0C1 Demand forecasting specifies the information to be provided to DSP s by other Users of the Distribution System so that these requirements can be met DOC1 1 3DOC 1 Demand forecasting sets out the Demand forecasting and the generating Plant output information to be provided by Users to enable DSP s to operate the Distribution System and specifies the information to be provided by Users to the DSP s DOC1 1 4Where Demand data is required from the User this means the MW Demand of electricity at the Connection Point DSP s may in certain cases specify that the Demand data shall include the MVAR Demand DOC1 1 5The means of providing the information to DSP s and its confirmation includes any non transitory written form or any other suitable means of electronic transfer which enables the recipient to retain information 52 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC1 2 Scope DOC1
5. DOC3 1 Introduction DOC3 1 1DOC3 is concerned with provisions to be made by DSP s or Users of the Distribution System in certain circumstances to permit reductions in Demand Reductions would be permitted a In the event of insufficient Generating Plant and transfers from external interconnections are available to meet Demand 55 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code b To avoid disconnection of Customers or c In the event of breakdown and or operating problems such as in respect of system Frequency system voltage levels or system thermal overloads on any part of the Transmission or Distribution System DOC3 1 2The Demand control procedures ensure that hardship to Users and Customers is minimised and that in so far as is practicable all parties affected are treated equitably DOC3 1 3DOC3 deals with the following means of reducing Demand a automatic low Frequency or voltage Demand disconnection b Customer Demand reduction including Voltage Reduction c Customer Demand management initiated by Suppliers or other parties other than following an instruction by DSP s or TSP d Customer Demand reduction instructed by DSP s or TSP and e Emergency manual Demand disconnection The term Demand Control is used to describe any or all of these methods of achieving a Demand reduction DOC3 1 4Where Demand Control is exercised by DSP s or the TSP it shall be do
6. Demand forecasting applies to the following Users of the Distribution System a Major Customers connected to the Distribution System and Medium Voltage Customers where DSP s considers it appropriate b Embedded Generators with Generating Plant over 2MW DOC1 3 Information Flow and Co Ordination DOC1 3 1DSP s shall co ordinate Demand Forecast information for each Bulk Supply Point to meet the requirement of the Saudi Arabian Grid Code SAGC DSP s shall aggregate forecast information provided by Users where appropriate and provide forecast information to the TSP where Demand or change in Demand is greater than 10MW at any Connection Point DOC1 3 2Embedded Generator information for Generating Plant in the Distribution System which is not subject to Central Dispatch shall be provided where specified to DSP s Customers with CHP and Customers with Auto production may also be required to supply information DOC1 4 Demand Forecast Data DOC1 4 1 Generating Units greater than 2MW and not subject to Central Dispatch shall provide DSP s with information regarding output and planned shutdowns for specified future periods This shall be provided on an annual basis when requested by DSP s DOC1 4 2Major Customers shall provide to DSP s information regarding Demand and planned shutdowns for specified future periods This shall be provided on an annual basis when requested by DSP s 53 Issue 01 Revision 00 November 2008
7. November 2008 The Saudi Arabian Distribution Code DCC6 Embedded Generator Requirements DCC6 1 Introduction DCC6 1 1 Distribution Connection Code 6 DCCE6 is applicable to all existing or prospective Generators including Customers with CHP Customers with Auto production and Generators using renewable or alternative sources of energy that are connected to the Distribution System Customers with stand by Generators who are connected to the Distribution System must comply with clause DCC6 9 DCC6 1 2In addition to meeting the requirements of DCC6 Embedded Generators shall also comply with the requirements of the General Conditions the Planning Code the Connection Conditions and other relevant sections of the Distribution Code Embedded Generators that are subject to Central Dispatch shall additionally have to comply with the Saudi Arabian Grid Code SAGC DCC6 1 3If existing generating Plant does not comply with the standards set down in or cannot comply for technical or economic or other reasons with the requirements of this section the Generator shall seek derogation from the provision from ECRA DCC6 1 4The Generator shall initiate discussions at a sufficiently early stage in design to allow DSP s to examine the impact of the Generating Unit s on the Distribution System DCC6 1 5DSP s may refuse permission for the connection of a Generating Unit at a point on the Distribution System or require revision to design or te
8. initiated by the receipt of specific complaints as to the quality of supply on the Distribution System DOC7 3 3Where testing or monitoring is required at the Connection Point with a User then DSP s shall advise the User involved and DSP s shall make available the results of such tests to the User DOC7 3 4Where a User is found to be operating outside the technical limits specified in the Distribution Code then the User shall rectify the situation or disconnect the apparatus causing the problem from its electrical system connected to the Distribution System immediately or within such time as agreed with DSP s 65 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC7 3 5Continued failure to rectify the situation shall result in the User being disconnected DOC7 3 6DSP s shall from time to time monitor the affects of the User on the Distribution System DOC7 3 7The monitoring shall normally be related to the amount of Active Power and Reactive Power or Flicker or Harmonics transferred across the Connection Point DOC7 3 8Where the User is exporting or importing Active Power or Reactive Power in an amount causing disturbances DSP s shall inform the User and the User shall restrict the power transfer to within the specified parameters DOC7 3 9DSP s may check from time to time that Users are in compliance with agreed Protection requirements and Protection settings DOC8 SAFETY CO ORDINATION
9. regard to the recommendations of the Panel submit a revised Distribution Code to ECRA for approval DGC7 Communications between DSP s and Users DGC7 1 Unless otherwise specified in the Distribution Code the methods of operational communication and data transfer shall be agreed between DSP s and Users from time to time DGC8 Emergency Situations DGC8 1 Users should note that the provisions of the Distribution Code may be suspended in whole or in part pursuant to any directions given and or orders made by ECRA in emergency situations pursuant to provisions of the Electricity Law issued by Royal Decree No M 56 16 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DGC9 Derogations DGC9 1 If a User finds that they are or will be unable to comply with any provision of the Distribution Code then they shall without delay report such non compliance to DCRP and shall subject to the provisions of DGC9 2 make such reasonable efforts as are required to remedy such non compliance as soon as reasonably practicable DGC9 2 Where the non compliance is a with reference to Plant and or apparatus connected to the Distribution System and is caused solely or mainly as a result of a revision to the Distribution Code or b with reference to Plant and or apparatus which is connected approved to connect or for which approval to connect to the Distribution System is being sought and the User believ
10. 3 For connections at Low Voltage it is possible in most cases to assess whether a proposed connection is acceptable and to determine the necessary supply arrangements from analysis of the following data a Maximum kVA requirements o Type and electrical loading of equipment to be connected such as number and size of motors cookers showers air conditioning space and water electrical heating loads and nature of Disturbing Loads e g welding equipment c The date when connection is required d Plan covered area and location If a preliminary examination of this data indicates that more detailed information is reasonably required then it shall be provided to DSP s upon request Information Requirements and timeframes for quotation and connection are provided in Customer service manual as prepared by DSP s and approved by ECRA Copies of this manual are available on request from DSP s For connections at distribution level the provisions of DCC2 1 also apply Additionally the following information may be required a All Types of Demand i Maximum Active Power requirements ii Maximum and Minimum Reactive Power requirements iii Type of load and control arrangements e g type of motor start controlled rectifier or large motor drives iv Maximum load on each phase v Maximum harmonic currents that may be imposed on the Distribution System vi Details of cyclic load variations or fluctuat
11. Connection Point d Work and or operation associated with equipment at the interface with the Distribution System Users connected to the Distribution System shall comply with the relevant sections of the Distribution Code The categories of Users of the Distribution System are described in Table 1 and the sections of the Code that apply to each User are shown in Table 2 Users shall also comply with the requirements of relevant legislation which from time to time comes into force There are a number of technical documents annexed to the Distribution Code Users are bound to comply with the requirements of these documents as appropriate to their circumstances User Users shall also be required to enter into technical and other agreements Customers and Generator Embedded Generators shall be required to have Connection Agreements with the DSP s and Retailers Traders shall be required to enter into Use of System Agreements with the DSP s or the TSP as the case may be 10 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code CATEGORIES OF USERS OF THE DISTRIBUTION SYSTEM Embedded Generator gt 10 MW Embedded Generator gt 2 MW lt 10 MW Embedded Generator lt 2 MW Customers with CHP or Customers with Auto production Customers with stand by Generators Major Customers connected at High Voltage Customers connected at Medium Voltage Industrial and commercial Customers connected at Low
12. Connection Point shall not be less than the design Fault Level of the Distribution System as shown in DCC4 1 below DSP s shall take into account the contribution to Fault Level of the User s connected system and apparatus in the design of its system Connection Size of Load Short Circuit Level Voltage kVA RMS Symmetrical kA lt 152 gt 152 lt 500 380 220V 500 13 8kV All 33kV All 69 All 220 127V Table DCC4 1 Short Circuit Ratings DCC4 6 Insulation Levels DCC4 6 1 The basic insulation level BIL and power Frequency withstand voltage for medium system voltages are as tabulated below System Nominal Voltage kv Altitude above mean sea level RMS UP TO 1000 METERS ABOVE 1000 METERS 325 350 BIL KV peak Power Frequency withstand voltage kV RMS BIL KV peak Power 33 34 5 Frequency withstand voltage kV RMS BIL KV peak Power 11 13 8 Frequency withstand voltage kV RMS Note the dry wet power Frequency withstands voltages are Dry for one 1 minute and wet for 10 seconds 41 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code The basic insulation level BIL and power Frequency withstand voltage for low system voltages are as tabulated below Power Frequency withstand voltage kV RMS System Nominal Voltage v 227 480 230 400 220 380 127 220 BIL KV peak DCC4 7 Capacitive and Inductive Effects DCC
13. DOC8 1 INTRODUCTION DOC8 1 1 DOC11 specifies the safety rules and procedures to be applied by the DSP s to meet statutory requirements and Distribution Licence conditions and obligations DOC8 1 2 Similar safety rules and procedures shall be provided by other Users of the Distribution System when carrying out work or tests at the operational interface with the DSP s DOC8 2 OBJECTIVES DOC8 2 1 the objectives of safety co ordination procedures are to lay down the Safety Management criteria to be applied to ensure safety of persons working on the Distribution System and or across operational and ownership boundaries 66 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC8 3 SCOPE DOC8 3 1 DOC8 specifies the safety rules and procedures that apply to the oO xe DSP s and the following Users of the Distribution System Embedded Generators Major Customers Any other party reasonably specified by the DSP s including Users connected at Medium or Low Voltage for appropriate sections of DOC8 when necessary 2 Agents of the DSP s or Users working on the Distribution System or at or across operational boundaries DOC8 4 DOC8 4 1 DOC8 4 2 DOC8 4 3 DOC8 4 4 DOC8 4 5 Procedures The Safety Management principles and procedures Safety Management System for ensuring the health and safety of all relevant personnel shall be specified by DSP s and Users for work on their
14. This is characterised by sudden de re energisation of the power supply Dead times are typically 0 3s 1s and 10s at Medium Voltage and 3s and 60s on 38kV systems and c Users should also be aware that disconnection of one or two phases only of a three phase system may be effected by Distribution Protection arrangements for certain types of faults 38 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCC4 2 4The minimum Protection required for a User installation connected to the Distribution System will vary according to type size and method of connection loop tail tee and Earthing of the User System It is anticipated that a new connection may require all or some of the following Protection facilities a three phase over current b earth fault Protection suited to the local supply system c distance d inter tripping and e Others DCC4 2 5 Where interface Circuit Breakers are used they shall be fitted with relays of a type acceptable to DSP s These relays shall have three phases over current elements and one earth fault element and shall have time current characteristics complying with standard types A S and C of IEC 244 Maximum permissible relay settings at the ownership boundary necessary to provide selectivity any time in the future will be provided by DSP s Distribution Protection aims to minimise the impact of faults including voltage dip duration and must not be adv
15. are listed e g 220 127V the lower value refers to the phase to neutral voltages All other values are phase to phase voltages Existing but non standard voltages are listed in Table DPC2 2 22 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code Sa Lowest Voltage Highest Voltage 220 127V 209 120V 231 134V 380 220V 360 209V 400 231V 13 8kV 13 1kV 14 5kV 33kV 31 4kV 34 7kV 69kv 65 5kv 72 5kv Table DPC2 1 Standard Service Voltages Nominal Lowest Voltage Highest Voltage Voltage 8 8 8 11kV 10 45kV 11 55kV 34 5kV 32 78kV 36 23kV Table DPC2 2 Existing But Non Standard Voltages 23 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DPC2 3 Harmonics The level of Harmonics in the power system shall comply with the limits set out in Table DPC2 3 on a continuous basis Nominal Total Harmonic Individual Harmonic z Voltage Distortion Voltage Distortion Voltage o o Odd _ Even 4 0 for N lt 14 127 380V 5 0 15forN gt 14 2 0 13 8kV 4 0 3 0 1 5 33kV 3 0 2 0 1 0 Table DPC2 3 Maximum Continuous Harmonic Levels Note N is the harmonic order or multiple of the fundamental Frequency Voltage distortion is expressed as a percentage of the fundamental voltage The indicated values refer to maximum continuous levels DPC2 4 Power Factor Each Customer shall maintain a Power Factor of not less than 0 85 laggin
16. does not exceed 1kV Major Customer A Customer who is supplied at Medium Voltage whose Load is greater than 1MVA Medium Voltage A voltage used for the supply of electricity the nominal value of which is between 11kV and 36kV MVAR Megavar 1 000 000 Volt Amperes reactive MW Megawatt 1 000 000 Watts Normal Operating Frequency The Frequency at which the system normally operates i e 60Hz Operation A scheduled or planned action carried out on a system Operational Effect The effect of any Operation which causes the Transmission System or the Distribution System or the system of other Users to operate or be at a materially increased risk of operating differently from the way in which they would or may have operated in the absence of such Operation Planned Outage An outage of Generating Plant or of part of the Transmission System or of part of the Distribution System other than a forced outage 75 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCD59 DCD60 DCD61 DCD62 DCD63 DCD64 DCD65 DCD66 DCD67 Plant Fixed and movable items used in the generation and or supply and or transmission and or distribution of electricity other than apparatus Power Factor The ratio of Active Power to apparent power Protection The provisions for detecting abnormal conditions in a System and initiating fault clearance or actuating signals or indications React
17. electricity to other licensees and or eligible Customers For this purpose Traders will be entitled to use both the Transmission System and the Distribution System for the transport of electricity from Generating Units to those licensees or eligible Customers Generators generate electricity which is fed onto the Transmission or Distribution Systems Generating Units are classified according to their voltage output power and whether or not they are subject to Central Dispatch by the TSP Customers may purchase electricity from the DSP s Traders or Retailers Some Customers have their own generating Plant for supplying all or part of their own needs These are referred to as Customers with CHP or Customers with Auto Production ECRA was established to regulate the new Electricity Industry 9 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 1 4 Use of the Distribution System Use of the Distribution System may involve any of the following transactions a Any connection at entry to or exit from the Distribution System which is called an interface point An entry point is the connection between the Distribution System and the Transmission System or an Isolated Embedded Generating Plant An exit point is the connection between the Distribution System and the Customer s premises b Use of the Distribution System to transport electricity between entry and exit points c Construction of a
18. equipment shall comply with the relevant statutory requirements DOC8 6 SAFETY RULES DOC8 6 1 Operation and Maintenance of the User s equipment shall only be carried out by authorized personnel Before first Commissioning the Plant operating procedures shall be agreed with the DSP s DOC8 6 2 Instructions for operating and or Earthing the User s electrical equipment shall be clearly displayed in the User s Medium and High Voltage switch room DOC8 6 3 Safety Procedures for personnel working on or in close proximity to the Distribution System Plant and apparatus shall be governed by the DSP s DOC8 6 4 In the event of a conflict between the provisions of this Code and the provisions of the TSP safety rules the provisions of the TSP Safety Rules shall take precedence 69 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code PART 6 DEFINITIONS DCD1 DCD2 DCD3 DCD4 DCD5 DCD6 DCD7 DCD8 DCD9 Active Power The product of voltage and the in phase component of alternating current normally measured in kilowatts kW or megawatts MW Ambient Temperature The surrounding temperature in the absence of the equipment of the immediate environment in which equipment is installed This temperature normally varies A derived constant value is taken for the purposes of designing or rating equipment AVR Automatic Voltage Regulator Back Up Protection That Protection system wh
19. provided by the Generator at the reasonable request of DSP s DCC6 3 3 DSP s will use the information provided to model the Generating Unit to determine a technically acceptable method of connection If DSP s reasonably concludes that the nature of the proposed connection or changes to an existing connection requires more detailed analysis then further information than that specified in DCC6 3 1 may be required DCC6 3 4 Additional information may be required from Embedded Generators larger than 2MW or connected at a voltage level above 13 8kV a ii Technical Data Generating Plant information impedance per unit on rating Type of prime mover Rated MVA MW Type of excitation system Automatic Voltage Regulator AVR A block diagram for the model of the AVR system including the data on the forward and feedback gains time constants and voltage control limits 47 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code iii Speed Governor and Prime Mover Data A block diagram for the model of the Generating Plant governor detailing the governor fly ball if applicable and system control and turbine rating iv Generator Excitation System b Capacity and Standby Requirements i Registered Capacity and minimum generation of each Generating Unit and power station in MW ii Generating unit and power station auxiliary Demand Active and Reactive Power in MW and MVAR at registe
20. representing ECRA c one person representing the TSP d one person representing Generators with Embedded generation e one person representing Major Customers f one person representing suppliers and g one representative of the SASO 15 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code If any of the above parties fails to appoint its representative ECRA shall appoint one on its behalf Each of the above shall be appointed pursuant to the rules issued pursuant to DGC6 4 DGC6 4 The Panel shall establish and comply at all times with its own rules and procedures relating to the conduct of its business such rules and procedures to be known as the Constitution and Rules of the Panel which shall be approved by ECRA The DSP shall consult all Users liable to be affected in relation to all proposed amendments to the Distribution Code and shall submit all proposed amendments to the Distribution Code to the DCRP for discussion prior to such consultation Unless an amendment is urgently required ECRA will not amend the Distribution Code until all affected Users have been given a reasonable opportunity to make representations to ECRA concerning the amendment and those representations have been taken into account ECRA will notify all DSP s and all affected Users of any amendment that ECRA makes to the Distribution Code DGC6 6 DCRP shall from time to time or at the behest of ECRA having
21. the System Test the Test Proposer shall be responsible for preparing a written report the Final Report of the System Test for submission to DSP s DOC6 3 16 The Final Report shall include a description of the Plant and or apparatus tested and of the System Test carried out together with the results conclusions and recommendations DOC6 3 17 Results of tests shall be reported to relevant parties taking into account confidentiality issues 64 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC6 3 18 all system test procedures shall comply with all applicable legislation DOC7 Monitoring Testing and Investigation DOC7 1 Introduction DOC7 1 1In order to discharge its responsibilities in respect of safe secure and economic operation of the Distribution System and in accordance with its licence conditions DSP s shall organise and carry out monitoring testing and investigation on the effect of Users electrical apparatus or electrical installation on the Distribution System DOC7 2 Scope DOC7 2 1DOC7 applies to the following Users of the Distribution System a all Embedded Generators b all Customers who are connected to the Distribution System DOC7 3 Procedures DOC7 3 1DSP s shall from time to time determine the need to test or monitor the quality of supply at various points on the Distribution System DOC7 3 2The requirements for specific testing and or monitoring may be
22. transfer load from faulted Plant In summary DSP s will provide Customer connections which will deliver the required capacity to an acceptable standard as detailed in the Distribution Code and will comply with the Saudi Arabian Grid Code SAGC at all points of connection to the Transmission System A higher standard of installation or a higher security of connection arrangement can be provided at the Customer s request with the provision that any additional costs will be attributed in full to the Customer DISTRIBUTION SYSTEM Standard Configuration The standard configuration of the Distribution System is illustrated schematically in Figure 1 below High Voltage a AV MV Substation Medium Voltage LABRO I6V Medium Voltage Network MV LV Substation Low Voltage Network Figure 1 Representation of the Distribution System 84 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 2 2 2 3 Voltage Levels There are a number of standard voltages in use on the Distribution System and Customers will be connected at one of these levels Voltage Levels at which a connection can be provided are as follows Voltage Level Nominal Voltage Low Voltage LV 220 127V phase phase phase neutral 380 220V phase phase phase neutral Medium Voltage 13 8kV 33kV 69kv standard MV 11kV 34 5kV existing but non standard Table 1 Distribution System Nominal Voltages Effects of Dis
23. 4 7 1 The User shall when applying to make a connection provide DSP s with information as detailed in DPC3 Details shall be required of any capacitor banks and reactors connected at Medium Voltage which could affect the Distribution System and which it is proposed to connect if agreed with DSP s When requested by DSP s details shall also be provided of distributed circuit capacitance and inductance Sufficient detail is required for the following a to verify that controlling equipment of the Distribution System is suitably rated b to show that the performance of the Distribution System will not be impaired DCC4 8 Voltage Disturbances DCC4 8 1 Users of the Distribution System must not generate voltage disturbances at a level that would affect other Users Users should in their own interest select equipment that is capable of functioning satisfactorily in the presence of disturbances at the levels that can be expected as indicated by IEEE 1159 DCC4 8 2 It is a condition of connection that equipment connected directly or indirectly to the Distribution System shall conform to the requirements of the Distribution Code as amended from time to time 42 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCC4 8 3 Loads and installations shall comply with the emission limits which are set out in DPC2 3 Harmonics DPC2 4 Power Factor DPC2 5 Phase Unbalance and DPC2 6 Voltage Stability S
24. P s or Users System Tests are those which involve either simulated or the controlled application of irregular unusual or extreme conditions on the Total System or any part of the Total System but which do not include Commissioning or re Commissioning tests or any other tests of a minor nature DOC6 2 Scope DOC6 2 1DOCE6 applies to the following Users of the Distribution System a Major Customers connected to the Distribution System where DSP s considers it appropriate b Embedded Generating Plant with a capacity greater than 2MW c Customers with CHP and Customers with Auto production where DSP s reasonably considers it appropriate DOC6 3 Procedures DOC6 3 1 If the System Test is proposed by DSP s or the User connected to the Distribution System then the provisions of DOC6 shall apply 62 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC6 3 2If the system test will or may have an affect on the Transmission System then the provision of the Saudi Arabian Grid Code shall apply DOC6 3 3System Tests which have a minimal effect on the Distribution System or the systems of others will not be subject to this procedure minimal effect shall be taken to mean variations in voltage Frequency and waveform distortion of a value not greater than those figures which are defined in the Distribution Planning Code DOC6 3 4When DSP s or a User intends to undertake a System Test which may have si
25. RA as revised from time to time with the approval of or by the direction of ECRA Distribution Code Review Panel The panel with the functions which are set out in DGC6 Distribution Licence A distribution licence granted under Article 5 and 6 of the Electricity Law promulgated on 20 10 1427 AH 21 11 2006 AD by Royal Decree M 56 and ECRA Charter dated 17 05 1425 AH 05 07 2004 AD Distribution System The system which consists of electric lines electric Plant transformers and switchgear and which is used for conveying electricity to final Customers Distribution Service Provider DSP The legal entity that is licensed to own and maintain a network on the Distribution System or has such right by virtue of its historic existence for this purpose Distribution Use of System Agreement The agreement between DSP s and Retailers Traders for transport of electricity from the Transmission System or Embedded Generators through the Distribution System to Customers Disturbing Loads Loads which have the potential to introduce waveform distortion Harmonics Flicker or phase unbalance into the system 72 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCD28 DCD29 DCD30 DCD31 DCD32 DCD33 DCD34 DCD35 DCD36 DCD37 Earthing The provision of a connection between conductors and earth by means of an Earthing Device Earthing Device A means of providing a connection between
26. SAIFI SAIFI Total Customer Interruptions Total Connected Customers Measured in interruptions per 100 connected Customer years 26 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 2 System Average Interruption Duration Index SAIDI SAIDI Total Customer Hours of Interruptions Total Connected Customers Measured in Customer hours of interruptions per connected Customer year 3 Customer Average Interruption Duration Index CAIDI CAIDI SAIDI SAIFI Measured in hours of interruption 4 Index of Reliability IR Average system availability Index ASAI IR ASAI 8760 Hours Year SAIDI x 100 8760 Hours Year Expressed as a percentage The DSP s will have to comply with the security of supply standards limits as published by ECRA from time to time DPC2 8 2 DSP s shall use reasonable endeavours to maintain a supply from the system This cannot be ensured since faults planned maintenance and new works outages and other circumstances outside DSP s control can cause interruptions On such occasions DSP s shall use reasonable endeavours to restore the supply or connection as soon as practicable but shall be under no liability for any direct or indirect damage or associated loss incurred by the User DPC2 8 3 Restoration times for different outage types are as follows Fault Outages DSP s shall endeavour to restore access to the system as soon as practica
27. Voltage Domestic Customers Retailers Traders The Distribution Service Provider DSP s Table 1 11 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code SECTIONS OF THE DISTRIBUTION CODE APPLYING TO PARTICULAR CATEGORIES OF USERS OF THE DISTRIBUTION SYSTEM CATEGORY OF USERS D Code Ref Al A2 A3 A4 AS Bl B2 B3 B4 DDD AA AO DOOAAAALO A O DOOAAAALOA O DAO AAA A AAO DAO AAA A AAO AAA AAA AA AO D R D R R R R D D D VD OOAA AA AAO 5 JJag oloa a aIl AO vive vivia amp Jg Aio Table 2 Not Applicable D Applicable with specific obligations R Relevant for information but no specific obligations Note 1 Customers represented in Categories A4 and A5 must comply with the Code sections relevant to that category and additionally to the relevant sections of the category of Customer to which they belong 12 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code PART 2 GENERAL CONDITIONS Contents DGC1 DGC2 DGC3 DGC4 DGC5 DGC6 DGC7 DGC8 DGC9 DGC10 DGC11 DGC12 Introduction Scope Implementation Unforeseen Circumstances Hierarchy Distribution Code Review Panel Communications between DSP s and Users Emergency Situations Derogations Confidentiality Force Majeure Disputes and Dispute Resolution Procedures
28. a conductor and earth of adequate strength and capability for its intended purpose ECRA Electricity and Co Generation regulatory Authority Effectively Earthed System A power system in which the neutral is connected to earth either directly or through a neutral resistor Embedded Having a direct electrical connection to the Distribution System Embedded Generators A Generator whose Generating Units are directly connected to the Distribution System and includes Customers with CHP and Customers with Auto production Event An unscheduled or unplanned although it may be anticipated occurrence on or relating to a System including without limiting that general description faults incidents and breakdowns Fault Level Prospective current that would flow into a short circuit at a stated point on the System It is expressed in kA or in MVA Flicker Periodic fluctuations in voltage at frequencies below the fundamental Frequency These are generally expressed as percentage variations relative to the fundamental voltage Frequency The rate of oscillation of the AC supply This is generally expressed as a Frequency range in terms of a nominal Frequency in Hz cycles per second with plus and minus percentage limits 73 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCD38 Frequency Response The automatic adjustment of Active Power output from a Generation Unit s in response to Freq
29. aith with affected Users in an effort to reach agreement as to what should be done If agreement cannot be reached in the time available DSP s shall determine what is to be done DGC4 2 Whenever DSP s makes a determination it shall have regard wherever possible to the views expressed by Users and in any event to what is reasonable in all the circumstances DGC4 3 Each User shall comply with all instructions given to it by DSP s following such a determination provided that the instructions are consistent with the then current technical parameters of the particular User s System registered under the Distribution Code The DSP s shall promptly refer all such unforeseen circumstances and any such determination to the Distribution Code Review Panel DCRP in accordance with DGC6 2 DGC5 Hierarchy DGC5 1 In the event of any conflict between the provisions of any direction of ECRA on the one hand and the provisions of the Distribution Code on the other the provisions of ECRA s direction shall prevail DGC5 2 Inthe event of any conflict between the provisions of the Distribution Code and any contract agreement or arrangement between DSP s and a User the provisions of the Distribution Code shall prevail unless the Distribution Code expressly provides otherwise DGC5 3 In the event of any conflict between the provisions of the Distribution Code and the Transmission Code relating to system operation the provisions of the Transmissio
30. all Users the Grid Code and the Distribution Code is shown diagrammatically in Figure 1 1 6 Issue 01 Revision 00 November 2008 The Saudi Arabia Distribution Code THE DISTRIBUTION CODE GRID CODE AND DISTRIBUTION CODE BOUNDARIES Transmission Connected Customers Subject to central dispatch and scheduling The Generators Captive J Grid Not subject to central Code National S li dispatch and scheduling Control Centre uppuers DSP s Transmission System dS L Distribution System Code Retailers Traders Information a as The Distribution Control Customers ae Distribution Centre s Figure 1 1 7 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 1 2 Structure of Distribution Code The Distribution Code is in seven parts as follows Part 1 Introduction This outlines the purpose of the Code its relationship with the Saudi Arabian Grid Code SAGC the structure of the electricity supply industry and how the various parts of the Code are relevant to the different Users of the Distribution system Part 2 General Conditions This presents provisions which are of general application to all parts of the Code Part 3 Planning This specifies the technical and design criteria and the procedures to be employed in the planning and development of the Distribution system Part 4 Connection Conditions These define the minimum standards for
31. and or revision to reflect stages of development of the regulatory framework of the industry and changes to comply with legislation and good industry practice The proposals for change will be received by the Distribution Code Review Panel DCRP The rules and responsibilities of the DCRP are described in chapter DGC6 Upon receipt of such proposals for change the DCRP will carry out the necessary process as appropriate to study these proposals and officially prepare a report of recommendations to ECRA for its approval The DCRP is a stakeholders representation panel and its members are outlined in chapter DGC6 3 of the Distribution Code As a User of this Distribution Code it is your responsibility to ensure that you possess the most up to date issue Issues of the Distribution Code can be downloaded from ECRA s web site www ecra gov sa This Preface is provided to Users and to prospective Users for their information only and does not constitute a part of the Distribution Code 3 Issue 01 Revision 00 November 2008 The Saudi Arabia Distribution Code Preface The Saudi Arabia Distribution Code has been developed to define the rules and regulations for various participants for accessing and using the Distribution System The objective is to establish the obligations of the distribution service providers DSP s and other system Users TSP Embedded Generators other distribution service providers and Customers for a
32. ators shall ensure that any part of the installation supplied by the Generating Plant has first been disconnected from the Distribution System and remains disconnected while the Generating Plant is connected to the installation Methods of changeover and interlocking shall meet these requirements DCC6 9 3 Places required to provide standby Generators as per The Council a b c d e 2 of Ministers No 27 and date 15 2 1401 are The Tow Holy Mosques Hospitals Drinking water pumping stations and Sewage pumping stations Computer Centres Places of assembly where more than fifty people are likely to gather such as public libraries galleries museums closed athletic stadiums conference and lecture rooms and public halls in large hotels Cold storage of vaccines blood banks refrigerated and frozen food stores Important buildings like the Council of Ministers and the most important sections of the Ministries of Defence and Interior and Civil Defence operations centres airports police stations and the radio and television building and other places determined by the Minister of the Interior Important Factories determined by the Ministry of Trade and Industry Any other places determined by the Minister of Trade and Industry after the agreement with Interior Minister 51 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code PART 5 OPERATION Contents DOC1 Demand Forecasting
33. ccessing and using the Distribution System more specifically to i define obligations responsibilities and accountabilities of all the parties for ensuring open transparent non discriminatory and economic access and use of the system while maintaining its safe reliable and efficient operation ii define minimum technical requirements for the participants and iii Set out the information exchange obligations of the participants 4 Issue 01 Revision 00 November 2008 The Saudi Arabia Distribution Code CONTENTS if INTRODUCTION 2 GENERAL CONDITIONS 3 PLANNING 4 CONNECTION CONDITIONS 5 OPERATION 6 DEFINITIONS T SECURITY AND PLANNING STANDARDS FOR THE DISTRIBUTION SYSTEM Demand Customers Only 5 13 21 35 61 83 93 Issue 01 Revision 00 November 2008 The Saudi Arabia Distribution Code PART 1 INTRODUCTION Contents 1 1 Purpose of the Distribution Code 1 2 Structure of the Distribution Code 1 3 Structure of the Electricity Supply Industry 1 4 Users of the Distribution System 1 1 Purpose of the Distribution Code The Distribution Code specifies the technical aspects of the working relationship between the DSP s and all Users of the Distribution system which are necessary to ensure a stable reliable and economical electrical Distribution system and to enable the DSP s to fulfil their obligations specified in the Saudi Arabian Grid Code SAGC The relationship between
34. ch information or advice shall be provided by DSP s as soon as practical following a request by the User whether during the application for connection process or otherwise PA Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DPC2 Design Standards DPC2 1 Frequency The Frequency of supply is outside the control of DSP s however the standard Frequency range is as follows The Transmission System Frequency is nominally 60Hz and shall normally be controlled within the limits of 59 9Hz to 60 1Hz The system Frequency could rise to 62 5 Hz or fall to 57 0 Hz in exceptional circumstances Design of Generators Plant and apparatus must enable operation of that Plant and apparatus within that range in accordance with the following Below nominal Above nominal Operation Frequency Hz Frequency Hz requirement 58 8 60 0 60 0 60 5 continuous 57 5 58 7 60 6 61 5 For period of 30 minutes For period of 30 seconds 57 0 57 4 61 6 62 5 Users should ensure their equipment is designed or protected for these exceptional circumstances DPC2 2 Voltages The voltages listed in Table DPC2 1 shall be used as standard service voltages at the interfaces with power Customers The service voltage shall be maintained within the range defined by the indicated lowest and highest values under steady state and normal system conditions and over the full loading range of the system Where two voltages
35. chnical parameters of the generation unit or impose certain restrictions in order to ensure that security and quality of supply standards as specified in DPC2 are maintained In such instances DSP s shall provide sufficient supporting information to justify the refusal or the required revisions DCC6 2 Specific Rules for Embedded Generators DCC6 2 1 The integrity of the Distribution System and the security and quality of supply to existing Users shall not fall below standard as a result of Generators operating in parallel synchronised with the Distribution System Conditions for operation shall guarantee the safety of members of general public 44 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code personnel distribution equipment Supply quality to other Customers shall not fall below standard as a result of the presence or operation of Generating Units DCC6 2 2 Generating Units connecting to the Distribution System and operating in parallel with or which are capable of being operated in parallel with the Distribution System shall comply with the relevant DSP s document This document sets out the conditions with which Generating Units operating in parallel with the Distribution System shall comply DCC6 2 3 Protection conditions and requirements are to protect the Distribution System The Generator is responsible for Protection of its personnel and equipment and the efficient operation of it
36. cted load is measured in volt amperes VA Connection Agreement An agreement between DSP s and each User setting out terms relating to a connection with the Distribution System Connection Point The physical point at which User s Plant or apparatus is joined to the Distribution System Customer A User whose premises are connected to the Distribution System for the purpose of obtaining a supply of electricity at that premises Customer with Auto Production A Customer generating electricity for their own use Demand The electric power which is drawn for the system by a Customer usually expressed in MW MVA or MVAR Demand Load The maximum load drawn from the power system by a Customer at the Customer s interface either estimated or measured Disconnector A device which provides in the open position a means of disconnecting apparatus from the Distribution System in accordance with specified requirements 71 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCD20 DCD21 DCD22 DCD23 DCD24 DCD25 DCD26 DCD27 Dispatch The issue of instructions for Generating Units to achieve specific Active Power and Reactive Power outputs within Registered Data parameters and by stated times Distribution Code This code required to be prepared by DSP s pursuant to condition 14 Compliance with transmission distribution and market codes of the Distribution Licence and approved by EC
37. d Demand DOC3 3 4Deliberate reduction in system Frequency may also be used to achieve a temporary reduction in load Demand in accordance with the Saudi Arabian Grid Code SAGC DOC3 3 5Emergency manual load shedding may be carried out on the Distribution or Transmission Systems for reasons of shortfall in supply or other reasons DOC3 3 6In the event of a sustained period of shortfall then planned rota load shedding may be used to share the available power among affected Customers DOC3 4 Implementation of Demand Control DOC3 4 1Where a Demand Control is exercised by DSP s in order to safeguard the Distribution System DSP s shall liaise with and inform Users accordingly as far as is practicable 57 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC3 4 2Where Demand Control is exercised by DSP s on instruction or request from the TSP in order to safeguard the total System then DSP s is required to respond to these requests promptly but shall liaise with and inform other Users so far as is practicable DOC3 4 3Procedures for load shedding including exemption policies load shedding rotas and Customer communications are contained in the Distribution load shedding criterion plan approved by ECRA DOC4 Operational Communications and Liaison DOC4 1 Introduction DOC4 sets out the requirements for the exchange of information in relation to Operations and or Events on the Distribution System or
38. ents DPC2 7 Earthing Requirements 1 Separation of LV Neutral and MV Grounds LV neutral ground and any grounds associated with MV equipment system e g MV metal work cable screen etc shall always be kept separate Primary neutral if available shall not be bonded to secondary neutral 1 Separation between LV neutral ground and MV equipment system ground shall be achieved by grounding LV neutral points which are remote from MV grounds Minimum distance between any part of MV ground system and nearest LV neutral ground shall be 4 meters 2 Recommended ground resistance limits for different installations should be as under System GROUND 5 ohms ALL distribution substation 5 ohms Surge arresters 5 ohms LV distribution panel 10 ohms 3 LV metering Installations It shall be essential for the Customer to provide grounding at his interface The Customer shall bring the ground wire to the grounding terminals provided in the meter box The ground wire of the Customer shall be connected to the ground terminal inside the meter box The ground terminal shall be short linked with the neutral 29 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 4 For more than one KWH meters at one location four KWH meters shall be connected to one ground rod In case of additional KWH meters at the premises additional ground rods shall be provided Ground mounted MV equipment The equipmen
39. erating Code 1 DOC1 DPC 3 1 3 In addition to periodic updates of planning information a User shall give adequate notice of any significant change to their system or operating regime to enable DSP s to prepare its development plans and implement any necessary system modifications In the event of unplanned changes in a User s System or operating regime a User shall notify DSP s as soon as is practically possible to ensure any necessary measures can be implemented DPC3 1 4 Users shall also provide details of reactive compensation Plant directly or indirectly connected to the Distribution System other than at Low Voltage including its rating and operational control DPC3 1 5 Users may be required to provide DSP s with detailed data relating to the interface between their System and that of the Distribution System covering circuit parameters switchgear and Protection arrangements of equipment directly connected to or affecting the Distribution System to enable DSP s to assess any implications associated with these points of connection DPC3 2 Information to be exchanged DPC3 2 1 On the request of a User DSP s shall provide such information as may be reasonably required on the design and other characteristics of the Distribution System 29 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DPC3 2 2 Where DSP s proposes to make certain modifications to its system or where it has received informati
40. ersely affected by Customer s Protection limitations a In order to ensure satisfactory operation of the Distribution System Protection systems operating times discrimination and sensitivity at the ownership boundary shall be agreed between DSP s and the User during the application for connection process and may be reviewed from time to time by DSP s b In order to provide against the failure of a Circuit Breaker or equipment having a similar function to operate correctly by interrupting fault current on the system back up Protection shall normally be provided by operation of other Circuit Breakers or equipment having a similar function 39 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code c Unless DSP s advises otherwise the use of Protection and associated equipment to limit the fault current infeed from the User s system to the Distribution System is not acceptable if the failure of that Protection and associated equipment to operate as intended in the event of a fault could cause equipment owned by DSP s to operate outside its short circuit rating DCC4 2 6 Protection relays shall be commissioned on site by the User who shall ensure that the settings are below the maximum permitted levels In certain cases DSP s may wish to witness these tests and it shall be the responsibility of the User to ensure that sufficient notice is given to DSP s in such cases Users shall ensure that
41. es either that it would be unreasonable including cost and technical considerations to require it to remedy such non compliance or that it should be granted an extended period to remedy such non compliance it shall promptly submit to DCRP a request for a derogation from such provision in accordance with the requirements of DGC9 3 and shall provide DSP s with a copy of such application DGC9 3 A request for derogation from any provision of the Distribution Code shall contain the following a the issue number and the date of the Distribution Code provision against which the non compliance or predicted non compliance was identified bo identification of the Plant and or apparatus in respect of which a derogation is sought and if relevant the nature and extent to which the non compliance exists c identification of the provision with which the User is or will be unable to comply 17 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DGC9 4 DGC9 5 DGC9 6 d the reason for the non compliance and e the date by which compliance will be achieved if remedy of the non compliance is possible subject to DGC9 2 b A standard Distribution Code Derogation Application form is included in Annex 2 If DSP s finds that they are or will be unable to comply with any provision of the Distribution Code then they shall subject to the remaining provisions of DGC9 make such reasonable efforts a
42. evels at each Distribution node covered by the request DSP s may levy a charge for the provision of this statement as approved by ECRA on account of the reasonable costs incurred by DSP s in preparing this statement The statement shall be prepared within 28 days after the date of receipt of the information or the agreement of the person making the request to pay the cost of the statement whichever is the longer In the case of Generators and Major Customers seeking connection this period may extend up to 100 days depending on the nature and complexity of the request DPC3 3 7 The dates given in this DPC3 3 are target dates only and do not constitute a legal commitment DSP s shall however use reasonable endeavours to abide by them 31 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code PART 4 CONNECTION CONDITIONS Contents DCC 1 DCC2 DCC3 DCC4 DCC5 DCC6 Introduction Information Required for Connection Connection Arrangements Technical Requirements for Connections Metering and Telemetry Generator Requirements DCC1 Introduction DCC1 1 DCC1 2 DCC1 3 DCC1 4 DCC1 5 It is necessary to require certain minimum technical design and operational criteria to be met by Users Plant and apparatus in order to maintain insofar as is permitted by Good Industry Practice stable and secure operation of the Distribution System for the benefit of all Users and for the Protection of the Distr
43. ficant incidents shall be reported in writing to the affected party in accordance with the provision of DOC5 59 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC4 4 2Significant Incidents shall include Events which result in or may result in the following a Voltage outside statutory limits b System Frequency outside statutory limits or c System stability failure DOCS Event Recording DOC5 1 Introduction DOC5 1 1DOC5 sets the requirements for reporting in writing those Events deemed to be Significant Incidents under DOC4 DOC5 1 2DOC5 also provides for the joint investigation of Significant Incidents by the Users involved DOC5 2 Scope DOC5 2 1DOC5 applies to the following Users of the Distribution System a Major Customers connected to the Distribution System where DSP s considers it appropriate b Embedded Generating Plant with a capacity greater than 2 MW c Customers with CHP and Customers with Auto production where DSP s reasonably considers it appropriate DOC5 3 Procedures DOC5 3 1DSP s and each User specified in DOC5 2 1 shall nominate officers and establish communication channels to ensure the effectiveness of DOC5 Such officers and communication channels may be the same as those established under DOC4 DOC5 3 2Communication shall as far as possible be direct between the User and DSP s This does not however preclude communication with the Users
44. g at the interface with DSP s No Customer shall present a leading Power Factor to the DSP s system DPC2 5 Phase Unbalance Under normal system conditions the three phase voltages shall be balanced at MV and higher voltages in the system such that the negative phase sequence voltage does not exceed 2 of the positive phase sequence voltage Customers with a dedicated transformer or those supplied at 13 8kV or a higher voltage shall balance their loads such that the load phase unbalance at the Customer interface meets the above criterion All other Customers shall balance their loads over the three phases to the greatest degree possible The DSP s shall then balance these loads within the power system to meet the above criterion 24 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DPC2 6 Voltage Stability Voltage Dips For non repetitive voltage variation or voltage dips such as those associated with motor starting welding equipment or power system switching the voltage variation shall not exceed 7 of the fundamental nominal voltage under normal circumstances Such variations shall not occur more frequently than 3 times per day Application No Customer shall connect equipment to the power system which causes voltage fluctuation at the Customer interface in excess of these requirements The DSP s shall ensure that the power supply at each Customer s interface conforms to these requirem
45. gnificant effect on the System of others normally twelve months notice or as otherwise agreed by DSP s shall be given by the person proposing the System Test Test Proposer to DSP s and to those Users who may be affected by such a System Test DOC6 3 5The proposal shall be in writing and shall contain details of the nature and purpose of the proposed System Test and shall indicate the extent and situation of the Plant or apparatus involved DOC6 3 6If the information set out in the proposal notice is considered insufficient by the recipient they shall contact the Test Proposer with a written request for further information which shall be supplied as soon as reasonably practicable DSP s shall not be required to do anything under DOC6 until they are satisfied with the details supplied in the proposal or pursuant to a request for further information DOC6 3 7 If DSP s wishes to undertake a System Test DSP s shall be deemed to have received a proposal of that System Test DOC6 3 8DSP s shall have overall co ordination of the System Test using the information supplied to it under DOC6 and shall identify in its reasonable estimation which Users other than the Test Proposer may be affected by the proposed System Test DOC6 3 9Following receipt of the System Test proposal DSP s shall evaluate the impact of the System Test and discuss the proposals with Users identified as being affected 63 Issue 01 Revision 00 November 2008
46. h a derogation applies and if relevant the nature and extent to which the derogation applies including alternate compliance provision d the reason for the non compliance requiring derogation and e the date by which the derogation ends if compliance will be achieved or by which such derogation expires To the extent of any derogation granted in accordance with this DGC9 DSP s and or the User as the case my be shall be relieved from its obligation to comply with the applicable provision of the Distribution Code and shall not be liable for failure to so comply but shall comply with any alternate provision as set forth in the derogation Should a derogation not be granted then the User will be required to comply with the applicable provision of the Distribution Code and will be liable for failure to so comply DCRP shall a keep a register of all derogations which have been granted identifying the name of the person in respect of whom the derogation has been granted the relevant provision of the Distribution Code and the period of the derogation and b on request from any User provide a copy of such register of derogations to such User Where a material change in circumstance has occurred a review of any existing derogations and any derogations under consideration may be initiated by DCRP at the request of ECRA DSP s or Users DGC10 Confidentiality DGC10 1 The Distribution Code contains procedures under wh
47. he 6 CTE Bois ELECTRICITY amp CO GENERATION REGULATORY AUTHORITY The Saudi Arabian Distribution Code Issue 01 Revision 00 November 2008 Prepared by a Saudi Electricity company SEC No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without written permission of the Electricity amp Cogeneration Regulatory Authority The Saudi Arabia Distribution Code CHRONOLOGY OF SAUDI ARABIA DISTRIBUTION CODE REVISIONS Sr No Revision No Date Detail of the revision 2 Issue 01 Revision 00 November 2008 The Saudi Arabia Distribution Code Forward This is the first issue of the Saudi Arabian Distribution Code Such work has been accomplished by extensive efforts from Saudi Electricity Company SEC and was subjected to thorough technical and legal reviews by internationally renowned consultants including ESBI of Ireland and CMS Cameron McKenna of UK as well as a number of major Saudi stakeholders and the Electricity amp Co Generation Regulatory Authority ECRA The Distribution Code is designed to indicate the procedures for both planning and operational purposes and covers both normal and exceptional circumstances It is however a live working document It will be from time to time subject to change
48. he Distribution System Such information may include an indication of the pattern of build up of load and a proposed Commissioning programme This information shall be specifically requested by DSP s when necessary and shall be provided by the User within a reasonable time 34 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCC2 5 Users shall contact DSP s in advance if it is proposed to make any significant change to the connection electric lines or electric equipment install or operate any generating equipment or do anything else that could affect the Distribution System or require alterations to connection DCC2 6 Users shall provide to DSP s any information reasonably required by DSP s about the nature or use by the User of electrical equipment on the User s premises DCC3 Connection Arrangements DCC3 1 Connection Voltage DCC3 1 1 During the application for connection process DSP s shall in consultation with the User specify the voltage level to which a User will be connected in accordance with normal practice for the type of load to be supplied and network characteristics DCC3 1 2 Generally the voltage level will be the minimum nominal voltage in standard use on the System assessed against a satisfactory operation of the installation b isolation of disturbance from other Customers c lifecycle costs and d cost of connection DCC3 1 3DSP s may on occasion specify h
49. her Customers Where DSP s considers that the Customer s installation is in a dangerous condition Where alterations repairs renewal or maintenance of the Distribution System or DSP s assets or means of connection require the de energisation of the Connection Point Where a Customer extends supply for use by another party whom DSP s considers to be a separate Customer In any other circumstances in which discretion is necessary or appropriate to enable DSP s to comply with the Distribution Code and or to operate the Distribution System in accordance with Good Industry Practice or is required by any law direction rule or regulation having the force of law 28 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DPC3 Transfer of Planning Data DPC3 1 Planning information to be provided by Users DPC3 1 1 Users of the Distribution System shall provide sufficient planning data information as can reasonably be expected to be made available when requested by DSP s from time to time to enable DSP s to comply with the requirements under its Distribution Licence DPC3 1 2 Users of the Distribution System shall provide planning data for specific future time periods updated annually as necessary and including projected Demand requirements anticipated changes in maximum Demand or generating capacity as appropriate The data and timescales over which the data is required are given in Distribution Op
50. ian Distribution Code SECURITY AND PLANNING STANDARDS FOR THE DISTRIBUTION SYSTEM Demand Customers Only 79 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 20 ZH Ze 2 3 3 0 3 1 3 2 3 3 CONTENTS General Definition Aim of Planning DISTRIBUTION SYST Standard Configuration Voltage Levels Effects of Disturbing Loads ASSESSMENT OF NEW LOAD Application Form Information Required from Customers Need for room substation As per DSP s Customer service manual 80 102 102 105 107 107 108 108 109 109 109 tia 111 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 1 0 INTRODUCTION 1 1 1 2 General The DSP s is required to operate and ensure the maintenance of and develop as necessary a safe secure reliable economical and efficient electricity Distribution System To this end this document Security and Planning Standards for the Distribution System has been prepared in accordance with the Distribution Code It outlines DSP s s approach to the development of the network giving details of how the connection of new loads and Embedded Generators to the Distribution System are assessed It is intended as a guide to Users of the Distribution System and is referred to in the Distribution Code Reference 2 While this guide refers to Customers loads the same factors will apply in ge
51. ibution System and Users Plant and apparatus directly connected to the Distribution System The Connection Conditions define the minimum standards for the method of connection to the Distribution System and the technical design and operational standards to which Users connecting to the Distribution System shall comply The Connection Conditions specify the technical arrangements required at the Ownership Boundary between the Distribution System and the installation of the User and are applicable to all voltage levels covered by the Distribution Code The Connection Conditions specify the information to be provided by Users to ensure that adequate provision can be made by DSP s for new connections or increases in existing load It also applies to Generators who operate in parallel with the Distribution System where a connection is required Prospective Users shall provide to DSP s in good time all the details set out in this section In conjunction with the Connection Conditions there are Connection Agreements which are bilateral agreements between DSP s and each User and which contain the detail specific to each User s connection to and use of the Distribution System The Connection Agreement requires the User and DSP s to comply with the terms of the Distribution Code 32 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCC2 Information Required for Connection DCC2 1 DCC2 2 DCC2
52. ich the DSP s will receive information from Users relating to the intentions of such Users The DSP shall not except in pursuance of specific requirements of the Distribution Code disclose such information to any User or other person without the prior written consent of the provider of the information subject to the requirements of the Distribution Licence 19 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DGC11 Force Majeure DGC11 1 If a DSP or User would breach the terms of the Distribution Code due to an event outside the reasonable control of the DSP or User a Force Majeure Event then those obligations under the Distribution Code that are affected by the Force Majeure Event are suspended as long as the Force Majeure Event continues DGC11 2 The DSP or the User must give the other party prompt notice of the Force Majeure Event including full details an estimate of likely duration the obligations affected by it and the steps taken to remove overcome or mitigate its effects DGC12 Disputes and Dispute Resolution Procedure DGC12 1 any dispute that arises from time to time regarding how the Distribution Code is being administered and interpreted shall be resolved following the Dispute Resolution Procedure as set out in DGC 12 2 DGC12 2 The Distribution Code Dispute Resolution Process shall be in accordance with complaints handling procedure submitted by DSP under Implementing Regulati
53. ich will open a Circuit Breaker or other fault current interrupting device in the absence of the current Protection operation of another Protection system Black Start The procedure which is necessary for recovery from a total or partial system shutdown Bulk Supply Point A point of connection between the Transmission System and the Distribution System or between the Transmission System and a directly connected Customer Central Dispatch The Dispatch of Generating Units by the Transmission Service Provider TSP Centrally Dispatched Generating Units Generating Units subject to Dispatch by the TSP Circuit Breaker A mechanical switching device capable of making carrying and breaking currents under normal circuit conditions and also of making carrying for a specified time and breaking currents under specified abnormal circuit conditions such as those of short circuit 70 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCD10 DCD11 DCD12 DCD13 DCD14 DCD15 DCD16 DCD17 DCD18 DCD19 CHP Combined Heat and Power The simultaneous production of utilisable heat and electricity from an integrated thermo dynamic process Commissioning The final process of testing part of a system prior to that part of the system being considered suitable for normal use Connected Load The sum of the nameplate ratings of all present and future electrical equipment installed by a Customer Conne
54. igher connection voltage in order to avoid potential disturbances caused by the User s apparatus to other Users of the Distribution System or for other technical reasons or may agree alternative methods for minimising the effects of Disturbing Loads DCC3 2 Information Provided by DSP s Based on the information provided by the User for a connection to the Distribution System DSP s shall prepare a statement containing as many of the following elements as are necessary for or relevant to the proposed installation 23 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code a nominal voltage at which connection will be made b method of connection extension and or reinforcement details c the normal impedance to source at the point of connection d method of Earthing e maximum IMPORTED CAPACITY f individual Customer limits relating to i Harmonic Distortion ii Flicker iii Phase Unbalance g expected lead time of providing connection following formal acceptance of terms for supply and h Cost of connection DCC3 3 Ownership Boundaries DCC3 3 1 The point or points at which supply is given or taken between the Distribution System and User s installation shall be agreed between DSP s and the User as stipulated in the Connection Agreement between DSP s and the User DCC3 3 2 For LV supplies DSP s responsibility extends up to the Customer s Connection Point which i
55. ing loads as below 33 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code b Disturbing Loads Comprehensive schedule of installed new equipment including details of Disturbing Loads These are loads which have the potential to introduce Harmonics Flicker or unbalance to the system This could adversely affect the supply quality to other Customers Disturbing loads could be non linear loads power converters regulators and loads with a widely fluctuating Demand The type of load information required for motive power loads welding equipment harmonic producing non linear loads and generating equipment can be obtained from DSP s on request In the case of compensating equipment associated with Disturbing Loads details and mode of operation to be provided so as to ensure compliance with emission limits specified in DCC4 8 3 c Fluctuating Loads Duty cycle including details of cyclic or other variation of Active Power and Reactive Power in particular i the rates of change of Active Power and Reactive Power both increasing and decreasing ii the shortest repetitive time interval between fluctuations in Active Power and Reactive Power and iii the magnitude of the largest step changes in Active Power and Reactive Power both increasing and decreasing DCC2 4 In some cases more detailed information may be required to permit a full assessment of the effect of the User s load on t
56. installation ref IEC909 Method of voltage control Generator transformer details as applicable and Requirements for Top up Supplies and or Standby Supplies Details will also be required on the following parameters Inertia Constant MW secs MVA whole machine Stator Resistance Direct Axis Reactance Sub transient Synchronous Time Constraints Direct Axis Sub transient Zero Sequence Resistance Reactance Negative Sequence Resistance Reactance Generator Transformer Resistance Reactance MVA Rating Tap arrangement Vector Group Earthing Other Plant and Equipment Details A comprehensive schedule of installed new equipment including details of Disturbing Loads is required 46 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code c Interface Arrangements The means of synchronisation between DSP s and User Details of arrangements for connecting with earth that part of the Generating Plant directly connected to the Distribution System The means of connection and disconnection which are to be employed and Precautions to be taken to ensure the continuance of safe conditions if any earthed neutral point of the Generators System operated at High Voltage become disconnected from earth DCC6 3 2 The details of information required will vary depending on the type and size of the Generating Unit or the point at which connection is to be made to the Distribution System This information shall be
57. ive Power The product of voltage and current and the sine of the phase angle between them which is normally measured in Kilo vars kVAR or Mega vars MVAR Retail Business The business of bulk purchase for the purpose of retail sale of electricity to Consumers or large consumers authorized by a licence Safety Management The procedure adopted by the DSP or a User to ensure the safe operation of its system and the safety of personnel required to work on that system Safety Procedures The procedures which are specified within a Safety Management system Significant Incident An Event which has had or which may have an Operational Effect on the Transmission or Distribution system or on a User s installation Step Change in Voltage A step change is defined as a single rapid change of the RMS voltage Distribution System voltage step changes can occur due to switching in and out of capacitors lines cables transformers and other Plant 76 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCD68 DCD69 DCD70 DCD71 DCD72 DCD73 DCD74 DCD75 System Tests Those tests which involve simulating conditions or the controlled application of irregular unusual or extreme conditions on the Total System or any part of it but not including routine testing Commissioning or reCommissioning tests Total Harmonic Distortion Total harmonic distortion is the aggregate of the harmonic di
58. levant international standard available and or if DSP s considers it necessary DSP s may notify Users that supplemental specifications and or standards shall be complied with in which case User Plant and apparatus shall so comply DCC4 1 4All equipment in an installation connected to the Distribution System shall be suitable for use at the operating Frequency of the Distribution System and at the voltage and short circuit rating of the Distribution System as shown in Tables DPC2 1 and DCC4 1 at the Connection Point DSP s may require certification that the equipment has been designed and installed in a satisfactory manner DSP s may also seek evidence that the equipment has been tested for conformity with the standards DCC4 1 5For Users connected at Low Voltage installations shall comply with the standards as in DCC4 1 2 and DCC4 1 3 Users complying with these rules and regulations shall be deemed to comply with the requirements of the Distribution Code as regards design and safety DSP s may seek evidence that the equipment has been tested for compliance with standards DCC4 1 6 Before connecting any User to the Distribution System it will be necessary for DSP s to be reasonably satisfied that the User s System complies with the appropriate requirements of the Distribution Code 37 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCC4 2 Protection Requirements DCC4 2 1 Users shall ensure tha
59. lly possible taking into consideration the KPI set values approved by ECRA Planned Outages DSP s shall give five days notice to relevant Users of planned supply interruptions In some situations to facilitate emergency 27 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code repairs or local outages affecting a small number of Customers shorter notice may be given Supply Curtailments In some circumstances it may be necessary to request Customers to reduce load or to use standby supplies where appropriate In these situations DSP s shall endeavour to maintain access to the System In extreme cases where this may not be possible DSP s shall endeavour to provide two days notice to the Users Load Shedding In extreme situations there may be generation shortages and load shedding may be required In these circumstances DSP s shall notify Customers if possible but as this is an emergency situation it may not be possible to do so DSP s shall prepare a Load Shedding Criterion and submit it to ECRA for approval This criterion shall detail the methodology for selection of load s to be shed DPC2 8 4 DSP s may disconnect Users under certain circumstances These circumstances shall include a Where the Customer s installation or use of electricity is such as to interfere with the satisfactory operation of the Distribution or Transmission system or to cause disturbance to ot
60. may be perceived as being relevant to the operation of the Distribution or User Installation in accordance with Good Industry Practice DOC4 3 4DSP s shall notify the User of any Operation on the Distribution System or of any Operation on the Transmission System of which it has received notice which in the opinion of DSP s will have or may have an Operational Effect on the installation of the User DOC4 3 5A User shall notify DSP s of any Operation on the installation of that User which will have or may have an Operational Effect on the Distribution System DOC4 3 6A notification under DOC4 shall include the name of the individual reporting the Operation and although it need not state the cause shall be in sufficient detail to describe the Operation and to enable the recipient reasonably to Know and consider the implications and risks arising there from The recipient may ask questions to clarify the notification DOC4 3 7A notification under DOC4 shall be given as far in advance as possible to allow the recipient to consider and assess the implications and risks arising DOC4 4 Significant Incidents DOC4 4 1 Where an Event on the Distribution System has had or may have had a significant effect on the User s installation or where an Event in the User s installation has had or may have had a significant effect on the Distribution System DSP s in consultation with the User shall deem the Event to be a Significant Incident Signi
61. methods of connection to the Distribution System Part 5 Operation This part addresses various operational issues including load forecasting planning outages reporting of operational changes and events safety matters and procedures for dealing with emergencies Part 6 Definitions Part 7 References This lists other documentation which is referred to in the Code 8 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 1 3 Structure of the Electricity Supply Industry The Electricity Supply Industry comprises the following entities a The Transmission Service Provider TSP owns and operates the Transmission System The Transmission System transports the electricity generated by Generating Units to the Distribution System through which most Customers will be supplied Some Generating Plant is connected directly to the Distribution System and is referred to as Embedded Generation The Distribution Service Provider DSP s is responsible for operating and maintaining secure reliable and efficient electricity Distribution System The Distribution System transports electricity from the Transmission System or from Embedded Generating Units to the final Customer Retailers supply electricity to Customers For this purpose Retailers will be entitled to use both the Transmission System and the Distribution System for the transport of electricity from Generating Units to Customers Traders supply
62. n Code shall prevail unless the Distribution Code expressly provides otherwise DGCE6 Distribution Code Review Panel DGC6 1 The DSP s shall establish and maintain the DCRP which shall be a standing body to carry out the functions referred to in DGC6 2 DGC6 2 The Panel shall 14 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code h keep the Distribution Code and its working under review review all suggestions for amendments to the Distribution Code which ECRA or any User may submit to a DSP for consideration by the Panel from time to time recommend to ECRA amendments to the Distribution Code that the Panel feels are necessary or desirable and the reasons for the recommendation issue guidance in relation to the Distribution Code and its implementation performance and interpretation when asked to do so by any User consider what changes are necessary to the Distribution Code arising out of any unforeseen circumstances referred to it by DSP s under DGC4 consider the affect of proposed changes on the Transmission Code publish recommendations as to amendments to the Distribution Code that a DSP or the DCRP feels are necessary or desirable and the reasons for the recommendations and Produce an annual report of the activities of the DCRP DGC6 3 The Panel shall consist of a chairperson and two persons appointed by and representing DSP s b one person appointed by and
63. n one or more items of network Plant is out of service The exact feeding arrangement will depend on which items are out of service As standby feeding is a temporary arrangement different standards of voltage apply A standard structure owned and operated by DSP s containing the distribution equipment necessary to connect a Customer to the Distribution System Terminal substations are operated at the connection voltage of the Customer i e transformation is not required A standard structure owned and operated by DSP s containing one or more transformers to convert electricity at one standard distribution voltage to a lower standard voltage The aim of planning is to ensure that the Distribution System is developed in an orderly and cost effective manner It is necessary to ensure that there is capacity available to meet new loads as they arise and to meet ongoing growth requirements It is also necessary to ensure that new connections are made 1 in an economic fashion 2 with a view to the possible future needs of the Customer and the network 3 in away that is technically acceptable 83 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 2 0 2 1 In general the MV networks are planned to a single contingency standard This means that the system is designed to withstand a single contingency and any outages experienced for this single contingency are only for such time as is required to
64. nditions there is an expectation that some generation will continue to operate outside the standard Frequency limits however for Embedded Generators connected to the Distribution System it is likely that this could mean connection within an automatic low Frequency load disconnection zone Consequently Embedded Generators should ensure that all Protection on Generating Plant should have settings to co ordinate with those on the low Frequency load disconnection equipment which will be detailed by DSP s on request DCC6 7 Black Start Capability DCC6 7 1 Embedded Generators shall notify DSP s if its Generating Plant has a restart capability without connection to an external power supply DCC6 8 Generating Plant Commissioning Tests DCC6 8 1 Where the Generating Plant requires connection to the Distribution System in advance of the Commissioning date for the purposes of testing the Generator shall comply with the requirements of the Connection Agreement The Generator shall provide DSP s with a Commissioning programme approved by DSP s if reasonable in the circumstances to allow Commissioning Tests to be co ordinated DCC6 9 Standby Generators DCC6 9 1 Parallel operation with the Distribution System generally is not permitted for standby Generators Specific agreement of DSP s is required for parallel operation 50 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCC6 9 2 Customers with standby Gener
65. ne in a manner that in so far as reasonably practicable does not discriminate against any Customer or supplier and shall use reasonable endeavours to ensure that the burden is shared fairly among Customers Exemptions may apply to vital and priority Customers as defined in the Distribution load shedding criterion plan submitted by DSP s and approved by ECRA DOC3 2 Scope DOC3 2 1DOC3 applies to DSP s and all Users of the Distribution System 56 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC3 2 2Implementation of Demand Control by DSP s may affect all Customers of Suppliers connected to the Distribution System and where applicable contractual arrangements between Suppliers and their Customers may need to reflect this DOC3 3 Methods of Demand Control DOC3 3 1 Customer Demand may be disconnected automatically at selected locations in accordance with the requirements of the Saudi Arabian Grid Code in the event of a sudden fall in Frequency Such an arrangement shall be carefully co ordinated as part of an overall scheme and may take into account any operational requirements or essential load DOC3 3 2Automatic disconnection by under voltage relay may be used discriminately to disconnect load at 33kV or 13 8kV in order to maintain voltage within acceptable limits so as to avoid widespread load shedding DOC3 3 3Deliberate reduction of voltage may be used to achieve a temporary reduction in loa
66. neral to Generators also There are however some specific requirements relating to Generators and these are included under a separate heading Section 5 Definitions In general the terms used in this document have the meanings intended in the Distribution Code As a brief guide the terms used in this document are defined below Term Definition Connection Asset The network erected to connect the Connection Point to the existing Distribution System The connection asset forms part of the Distribution System and is not shared by other Users Continuity or This describes the quality of a supply as it Continuity of Supply relates to outages whether caused by faults or planned work A set of measures are required to describe continuity but in general the lower the incidence of outages and the shorter their duration the higher the continuity Distribution System The electric lines Plant and switch gear used to convey electricity to final Customers excluding Customers connected directly to the Transmission System grid 81 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code Disturbing Load Flicker Looped Connection Losses Maximum Import Capacity Normal Feeding Security of Connection Short Circuit Level Short Circuit Rating An electrical load that of its nature may affect the quality of electricity supply of other Customers Examples are welders large electric motor
67. nominated representative DOC5 3 3In the case of an Event that has been reported to DSP s under DOC4 and subsequently has been determined by DSP s to be a Significant Incident a written report shall be given to DSP s by the User in accordance with DOC5 60 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC5 3 4In the case of an Event that has been reported to the User under DOC4 and subsequently has been determined by DSP s to be a Significant Incident a written report shall be given to the User by DSP s in accordance with DOCS DOC5 3 5A Report shall be in writing or in electronic form and shall be sent to DSP s or User as the case may be It shall contain confirmation of the notification given under DOC4 together with more details relating to the Significant Incident including information which has become known relating to the Significant Incident since the notification The report shall as a minimum contain those matters specified in DOC5 DOC5 3 6A report under DOC5 shall be given as soon as reasonably practical after the notification under DOC4 DOC5 4 Joint Investigations DOC5 4 1 Where a Significant Incident has been declared and a report submitted under DOCS either party or parties may request in writing that a joint investigation be carried out DOC5 4 2The composition of such an investigation panel shall be appropriate to the incident to be investigated and agreed by all parties i
68. nvolved DOC5 4 3A joint investigation shall only take place where all parties affected by it agree to it The form and rules of and procedures for and all matters relating to the joint investigation shall be agreed at the time of a joint investigation and in the absence of agreement the joint investigation shall not take place DOC5 5 Matters to be Included in a Written Report of a Significant Incident DOC5 5 1 Matters applicable to DSP s and Embedded Generators are as follows date and time of Significant Incident location equipment involved brief description of Significant Incident details of any Demand Control undertaken conclusions and recommendations if applicable eee 61 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC5 5 2Matters applicable to DSP s are as follows Effect on Users where appropriate a Duration of incident and b Estimated date and time of return to normal service DOC5 5 3 Matters applicable to Embedded Generators as follows a date and time of Significant Incident b location c equipment involved d brief description of Significant Incident e details of any Demand Control undertaken f conclusions and recommendations if applicable DOC6 System Tests DOC6 1 Introduction DOC6 1 1DOCE6 sets out the responsibilities and procedures for arranging and carrying out System Tests which have or may have an effect on the Systems of DS
69. ocedures set down the basic safety requirements at the operator and DSP s interfaces These procedures are necessary to ensure the safety of all who may have to work at either side of the interface or on the interface boundary a Written rules for safety working and communicating procedures shall be available and used by all persons who may have to work at or use the facilities provided at the Interface b Electrical equipment connected to either side of the interface and interface equipment shall be under the control of a named person at either side c Each item of equipment shall be controlled by only one identifiable person at any one time d Adequate means of isolation shall be provided at the interface to allow work to be carried out safely at either side of the interface e Where necessary to prevent danger adequate facilities for Earthing shall be provided at either side of the interface to allow work to be carried out safely at the interface or at either side of the interface f Adequate working space adequate means of access and egress and where necessary adequate lighting shall be provided at all electrical equipment on or near which work is being done in circumstances which may cause danger 68 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code g All electrical equipment shall be suitably identified where necessary to prevent danger h Electrical installations and
70. on from a User under DPC4 1 above which may impact on other User installations then DSP s will notify Users of the proposal subject to any constraint of confidentiality or timing DPC3 2 3 DSP s shall provide information on request to Users regarding the local network conditions to enable them to determine their Protection requirements DPC3 2 4 Where the User s installation is connected to the bus bars of the Distribution System sufficient details may need to be exchanged with respect to User DSP s Ownership Boundary to enable an assessment to be made of transient over voltage effects The request for information may be initiated by either DSP s or the User DPC3 2 5 Information may be exchanged between DSP s and the User on fault in feed levels at the feeding bus bar or point of connection to the Distribution System as appropriate in the form of Three phase and single phase to earth short circuit in feed The X R ratio under three phase fault conditions DPC3 2 6 Information shall be exchanged between DSP s and User on Demand Transfer Capability where the same Demand can be supplied from alternate User points of supply This shall include the proportion of Demand normally fed from each point of supply and the arrangements manual or automatic for transfer under planned fault outage conditions DPC3 3 Planning Studies DPC3 3 1 In order to facilitate connections to the Distribution System DSP s shall prepare on reques
71. ons Article 29 20 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code PART 3 PLANNING Contents DPC 1 DPC2 DPC3 Introduction Design Standards Transfer of Planning Data DPC1 Introduction DPC1 1 DPG1 2 DPC1 3 DPC1 4 Part 3 Planning specifies the technical and design criteria and the procedures to be complied with by DSP s in the planning and development of the Distribution System It also applies to Users in the planning and development of their installations in so far as they affect the Distribution System The Users requirements may necessitate the reinforcement of or an extension to the Distribution System and for reinforcement of or extension to the relevant Transmission Distribution interface capacity such work being identified by DSP s or TSP as appropriate The time required for the planning and development of the Distribution System and any consequential requirement of the interface with the Transmission System will depend on the type and extent of the necessary reinforcement and or extension work the time required for obtaining planning permission and right of way including any associated hearings and the degree of complexity in undertaking the new work while maintaining satisfactory security and quality of supply Reference is made in Part 3 to DSP s supplying information or advice to Users For avoidance of doubt unless the context otherwise requires su
72. pecial conditions for Generators are presented in DCC6 DCC5 Metering and Telemetry DCC5 1 The User may be required to provide such voltage current Frequency Active Power and Reactive Power pulses as are considered necessary by DSP s to ensure adequate system monitoring Details will be specified in the User s Connection Agreement DCC5 2 Centrally dispatched Generating Units shall provide signals to the TSP as required by the Saudi Arabian Grid Code SAGC DCC5 3 If itis agreed between the parties that DSP s shall control the switchgear on the User s system DSP s shall install the necessary telecontrol outstation Notwithstanding the above it shall be the responsibility of the User to provide the necessary control interface for the switchgear of the User which is to be controlled DCC5 4 Metering principles applying to certain Users connected to the Distribution System shall be specified in the User s Connection Agreement DCC5 5 Specific metering arrangements depend on the load type size and nature of the installations being connected DCC5 6 Specific Arrangements DCC5 6 1 The specific arrangements for connection including substation layout requirements User equipment and Metering are set out clearly in the Distribution Code and or Customer Service Manual as prepared by DSP s and approved by ECRA Users must comply with the provisions of the documents relevant to their installations 43 Issue 01 Revision 00
73. rectly to DSP s 54 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC2 3 2Centrally Dispatched Generating Units shall comply with the requirements of the Saudi Arabian Grid Code SAGC Information shall be provided directly to the TSP DOC2 4 Timescales and Data DOC2 4 1 Detailed implementation of data gathering and timescales shall be determined by DSP s and each User Due recognition shall be given by DSP s to voltage levels and capacities of Plant and apparatus when assessing information requirements DOC2 4 2The information may be required for different timescales as may be determined by DSP s planning needs DOC2 5 Information from Embedded Generators DOC2 5 1 Information from Embedded Generating Plant greater than 2MW and not subject to Central Dispatch shall include details of Planned Outages for maintenance or other purposes as well as the expected time of return of service DOC2 5 2The Generator shall not synchronise without first obtaining permission from DSP s unless prior agreement has been reached with DSP s DOC2 6 Information to Users DOC2 6 1DSP s shall advise Major Customers or Generators who may be significantly affected by particular outages of Distribution Plant and apparatus of the likely dates and duration of the outages If there are objections from Users these shall be considered by DSP s and alternative arrangements proposed if possible DOC3 Demand Control
74. red capacity conditions iii Generating unit and power station auxiliary Demand Active and Reactive Power in MW and MVAR under minimum generation conditions DCC6 3 5In normal circumstances the information specified above will enable DSP s to assess the connection requirements Occasionally additional information may be required In such circumstances the information shall be made available by the Generator at the reasonable request of DSP s DCC6 4 Information Provided by DSP s DCC6 4 1 DSP s shall prepare a statement as per DCC3 2 for Generators applying for connection to the Distribution System DCC6 4 2 Where Generator paralleling or power export is intended the following additional information shall be provided including a Interface Protection settings b Equipment cabling switchgear metering requirements c Substation site and building requirements dimensions access planning permission Earthing lighting and heating 48 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCC6 5 Technical Requirements DCC6 5 1 Generating Plant Performance Requirements a All centrally dispatched Generators shall comply with the relevant sections of the Saudi Arabian Grid Code SAGC b For Embedded Generators not subject to Central Dispatch the electrical parameters to be achieved at the Generating Unit terminal shall be specified by DSP s with the offer for connection c Pro
75. relation to the existing network and plan cover area 3 2 2 Maximum Import Capacity MIC Maximum Import Capacity MIC required the size and nature of the load diversity of the load and proposed phasing of the development i e the pace at which the load is expected to increase from a specified initial Demand to the full Demand 3 2 3 Disturbing Loads Details of any disturbing elements of the load are required such as Large motors details of starting arrangements for all large motors Disturbing Loads i e electric welding and details of the nature and usage pattern of the disturbing load Harmonics details of any non linear equipment likely to produce Harmonics on our system and any filtering arrangements which the Customer may have already in place The Customer should also provide details of compensation or balancing equipment connected Unbalanced Loads Where a Customer has a three phase supply load should be balanced as evenly as possible over the three phases 86 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code The above is an example of the information which may be requested Depending of the size and complexity of the load additional information may also be requested Power Factor The Power Factor of the Customers load as seen by the network must be 0 85 or higher No Customer may present a leading Power Factor load to the DSP s system 3 2 4 Multiple Customer Development Ver
76. respective Systems or Plant apparatus connected to them There shall be joint agreement by DSP s and Users on which Safety Management System is to be used for sites or locations where an operational boundary exists and proper documentation of the safety precautions to be taken shall be maintained There shall be written authorisation of personnel who do the work of control operation work or testing of Plant apparatus forming part of or connected to the Distribution System There shall be joint agreement between DSP s and Users which specifies responsibility for system or control equipment which shall ensure that only one party is responsible for any item of Plant or apparatus at any one time DSP s and each User shall at all times have nominated a person or persons responsible for the co ordination of safety on the respective system 67 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC8 4 6 DOC8 4 7 DOC8 5 DOC8 5 1 DSP s and each User shall maintain a suitable system of documentation which records all relevant Operational Events that have taken place on the Distribution System or other system connected to it and the co ordination of relevant safety precautions for work System diagrams which show sufficient information for control personnel to carry out their duties shall be exchanged between DSP s and User as required Safety at the DSP s User Interface The following pr
77. s Generating Unit DCC6 2 4Where a Generating Unit is to be installed on premises DSP s shall be informed DSP s shall have the right to inspect generating installations to ensure that the requirements are met In some cases DSP s may require a demonstration by operation of the Generator Such demonstrations shall be by agreement with the User DCC6 3 Provision of Information DCC6 3 1 Information Required from Embedded Generators Embedded Generators shall provide to DSP s information on a the Generating Plant and b the proposed interface arrangements between the Generating Plant and the Distribution System The information required by DSP s before entering into an agreement to connect any Generating Plant to the Distribution System is shown below a Generating Plant Data i Terminal Volts kV ii Rated kVA ii Rated kW iv Maximum Active Power sent out kW Reactive Power requirements kVAR 45 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code Type of Generating Plant synchronous asynchronous etc Type of prime mover Anticipated operating regime of generation e g continuous intermittent peak lopping Fault Level Contribution a calculation sheet showing the fault current available from the Generators due to a metallic three phase short circuit at the main incoming Circuit Breaker when all the Generators are operating Account should be taken of any large motors in the
78. s are required to remedy such non compliance as soon as reasonably practicable In the case where DSP s requests derogation DSP s shall submit the information set out in DGC9 3 to DCRP On receipt of any request for derogation DCRP shall promptly consider such request and discuss the potential outcomes of such request with ECRA Following such discussion DCRP shall recommend to ECRA such derogation provided that DCRP considers that the grounds for the derogation are reasonable DCRP will not recommend to ECRA such derogation if a It would or it is likely that it would have a material adverse impact on the security and stability of the Distribution System or b It would result in ECRA imposing unreasonable costs on the operation of the Distribution System or Transmission System or on other Users In its consideration of a derogation request by a User DCRP may contact the relevant User and or DSP s to obtain clarification of the request or to discuss changes to the request Derogation from any provision of the Distribution Code shall contain the following a the issue number and the date of the Distribution Code provision against which the derogation applies b identification of the provision with which the derogation applies 18 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DGC9 7 DGC9 8 DGC9 9 c identification of the Plant and or apparatus in respect of whic
79. s etc See Appendix 1 Voltage fluctuations caused by a disturbing load or rapid variations in Generator output the major effect of which is Flickering of standard incandescent light bulbs As described in DPS Electrical losses are the difference between the energy entering the Distribution System and that delivered to Customers Losses are the energy lost in the network due to the heating effect of the electricity passing through it This is the maximum load that the Customer has contracted with DSP s The network configuration under normal conditions and when all distribution Plant is in service The normal feeding arrangement is typically designed to provide best voltage performance to minimise network losses and to make optimum use of the capacity of feeding substations The expectation that the Connection Point will remain energised The short circuit level is a measure of the strength of the network i e the ability to limit the impact of Disturbing Loads and to maintain voltage stability The size of the Customer switched load relative to the short circuit level determines the magnitude of its impact on the voltage This refers to the short circuit rating of the item 82 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 1 3 Standby Feeding Bulk Customer substation Distribution Substation Aim of Planning of Plant concerned The feeding arrangement whe
80. s normally at DSP s main Circuit Breaker as further specified in the Connection Agreement between DSP s and the User DCC3 3 3 For Medium Voltage supplies the ownership boundaries shall be subject to specific agreement between the parties in each case Changes in the Boundary arrangements proposed by either party shall be agreed in advance DCC3 3 4 All equipment at the Ownership Boundary shall meet the design principles contained in DPC2 and DCC3 Connections for entry to and exit from the Distribution System shall incorporate a means of disconnection of the User s installation by DSP s 36 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCC4 Technical Requirements for Connections DCC4 1 Connection Standards DCC4 1 1 A connection to the Distribution System may be by means of an overhead line an underground cable or a combination of both as detailed in the Connection Agreement between DSP s and the User The network configuration at the Connection Point may take a number of forms suitable to the nature of the load and network arrangements DCC4 1 2 All equipment in an installation connected to the Distribution System shall be designed manufactured tested and installed in accordance with all applicable statutory obligations and shall conform to the relevant IEC distribution standards current at the time of the connection of the installation to the Distribution System DCC4 1 3 If there is no re
81. stortions at all harmonic frequencies This is expressed as the root mean square value of harmonic distortions at all harmonic frequencies Trading Business The business of bulk purchase for the purpose of sale of electricity from to other Licensees or large Consumers authorized by a licence Transmission System Reference shall be made to the Saudi Arabian Grid Code SAGC for detailed definition Transmission Service Provider TSP The legal entity that is licensed to own and maintain a network on the Transmission System or has such right by virtue of its historic existence for this purpose User A term used in various sections of the Distribution Code to refer to the persons using the Distribution System more particularly identified in each section of the Distribution Code Voltage Reduction A method to control Demand temporarily by reduction of system voltage Voltage Unbalance In three phase networks the conditions in which the RMS values of the phase voltages or the angles between consecutive phases are not equal T1 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCD76 Zero Phase Sequence A set of phases of equal magnitude and zero phase angle relative to each other The 3 phase values are thus in phase with each other The term zero sequence may be applied in the same sense to AC voltages and currents 78 Issue 01 Revision 00 November 2008 The Saudi Arab
82. sus Single Load Whether the application is for infrastructure to facilitate connections to multiple end Customers within a development or is for connection of a single Customer 3 2 5 Specific Requirements Details of any specific Customer requirements for connection of the load 3 2 6 Load Coincidence Customers should note when assessing the Capacity requirements that not all of the equipment will be operating at full load at the same time The Customer should apply a coincidence factor to each component of the load as well as to the overall load in order to assess the capacity required Coincidence factors will vary depending on the nature of the load 3 3 Need for room substation As per DSP s Customer service manual 87 Issue 01 Revision 00 November 2008
83. t a study showing the implications of a connection at a particular point on the system DPC3 3 2 Under the terms of the Distribution Licence a reasonable charge as submitted by DSP s and approved by ECRA may be levied by DSP s for the planning study 30 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DPC3 3 3 A User or potential Users shall provide DSP s with information regarding the proposed facility including load details interface arrangements proposed Connection Point and import export requirements DPC3 3 4 The studies shall normally be prepared within 28 days after the date of receipt of the information or the agreement of the person making the request to pay the cost of the study whichever is the longer In the case of Generators and Major Customers seeking connection depending on the nature and complexity of the request this period may extend up to 100 days or a further 28 days from the receipt of planning information from the TSP whichever is the greater DPC3 3 5 Details of the procedures for application for connection to the Distribution System are contained in CUSTOMER SERIVICE MANUAL as prepared by DSP s and approved by ECRA DPC3 3 6 Where such information is available DSP s shall provide on request a statement of present and future circuit capacities forecast power flows and loadings on part or parts of the Distribution System specified in the request and shall include Fault L
84. t covered are RMU MV switches etc when separated from Transformer and Bulk Customer Indoor Switchgear All metal work shall be bonded together and to the substation metalwork grounding system Each continuous piece of metal that could form part of the path of a ground fault current shall be bonded to its neighbors so that continuity of grounding circuit does not depend on mechanical connections between components Licensed Distributors shall advise on the method of Earthing of the Distribution System for example whether it is connected solidly to Earth or through impedance The specification of associated apparatus and Plant of the Distribution System User shall meet the voltages that will be imposed on the apparatus and Plant as a result of the method of Earthing Notwithstanding the above the DSP s shall provide a complete separate Earthing code to define the Earthing requirements for safe use of the system This code shall constitute an integral part of the Distribution code Distribution System Users shall take precautions to limit the occurrence and effects of circulating currents in respect of the neutral points connected with Earth where there is more than one source of electricity DPC2 8 Security of Supply DPC2 8 1 The Security Standard for the Distribution System is as follows Security of supply also known as continuity is evaluated in terms of four indices as follows 1 System Average Interruption Frequency Index
85. t faults in the User s Plant and apparatus do not unreasonably cause disturbances to the Distribution System or to other Users Without limiting this obligation a User shall prior to connection of the User s installation to the Distribution System install the Protection equipment specified in DCC4 2 4 DCC4 2 2 Unless provided against faults on the Distribution System can cause damage to User s Plant and apparatus through for example loss of a phase over voltage or under voltage The User shall take account of the established practices of the particular network to which a connection is to be made and ensure that Protection installed is compatible with that used by DSP s The adequacy of the Protection installed by the User is the User s responsibility DCC4 2 3 The User s Protection arrangements at the Ownership Boundary including types of Equipment and Protection settings shall be compatible with existing system conditions and the Distribution System Protection practice as specified by DSP s at the time of application In particular a the maximum clearance times from fault current inception to arc extinction shall be within the limits established by DSP s in accordance with Protection and equipment short circuit rating policy adopted for the Distribution System b in connecting to the Distribution System the User should be aware that fast and slow speed automatic re closing is a feature of Power System operation
86. tection associated with Embedded Generating Plant shall be required to co ordinate with the Distribution System Protection regarding i Clearance times for fault currents ii Co ordination with auto recloser requirements iii Protection settings of the controlling Circuit Breaker Protection settings shall not be changed without a written agreement from DSP s These Protection requirements are additional to normal interface Protection requirements of the User d For Generators the Total Harmonic Voltage Distortion THVD limit is given in Table DCC6 1 below Voltage Level Total Harmonic Voltage Distortion Table DCC6 1 Generator Total Harmonic Voltage Distortion Limits 49 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCC6 6 Islanding DCC6 6 1 It is conceivable that a part of the Distribution System to which the Embedded Generators are connected can during emergency conditions become detached from the rest of the System DSP s may decide dependent on local network conditions if it if desirable for the Embedded Generators to continue to generate onto the islanded Distribution System DCC6 6 2 If no facilities exist for the subsequent automatic resynchronisation with the rest of the Distribution System then the Embedded Generators shall under DSP s instruction ensure that the Generating Plant is disconnected for resynchronisation DCC6 6 3 Under emergency co
87. the Protection settings remain below the maximum permitted levels This may require regular testing of the relays DCC4 3 Earthing DCC4 3 1 Earthing of the part of the User s installation that is connected to the Distribution System shall comply with the requirements of DPC2 7 DCC4 3 2 The arrangements for connecting the User s installation with earth shall be designed to comply with relevant international and national standards DCC4 3 3 The method of Earthing the Distribution System whether for example it is connected to earth solidly or through impedance shall be advised by DSP s The specification of associated equipment shall be appropriate to the voltages that will be imposed on the equipment as a result of the method of Earthing DCC4 3 4Where there is more than one source of energy Users shall take precautions to limit the occurrence and effects of circulating currents in respect of neutral points connected with earth DCC4 4 Voltage Regulation and Control DCC4 4 1 Extensions or connections to the Distribution System shall be designed so that they do not hinder the necessary control of voltage on the Distribution System Information on the voltage regulation and control arrangements shall be made available by DSP s if requested by the User DCC4 5 Short Circuit Levels 40 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCC4 5 1 The short circuit rating of User s equipment at the
88. the installation of any User connected to the Distribution System which have had or may have had or will have or may have an Operational Effect on the Distribution System or the installation of any other User DOC4 2 Scope DOC4 applies to the following Users of the Distribution System a Major Customers connected to the Distribution System where DSP s considers it appropriate b Embedded Generating Plant with a capacity greater than 2MW c Customers with CHP and Customers with Auto production where DSP s reasonably considers it appropriate DOC4 3 Procedure DOC4 3 1DSP s and Users connected to the Distribution System shall nominate persons and or contact locations and agree communication channels for the necessary exchange of information to make effective the exchange of information required by DOC4 DOC4 3 2SCADA equipment may be required at a User s site for transmission of information and data to and from the DSP s The requirement to provide this information shall normally be included in the relevant Connection Agreement 58 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DOC4 3 3Information between DSP s and Users shall be exchanged on the reasonable request of either party The request may follow a specific Operation or be in accordance with a prior agreement to exchange information on particular types of Event This does not preclude the voluntary exchange of information which
89. turbing Loads Certain types of equipment such as motors and welders may cause fluctuations in the supply voltage which cause disturbances to the connection of other Customers Where Customers intend to install any equipment likely to cause supply disturbances this equipment must be evaluated to assess the likely impact The limits imposed on Disturbing Loads are specified in the Distribution Code It may be necessary depending on the characteristics of the equipment for a Customer connection to be made using a different network configuration via a higher voltage a dedicated substation or other method 85 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code 3 0 ASSESSMENT OF NEW LOAD 3 1 Application Form The assessment of the connection for a new load requires details of the load The details should be provided by completing an application form as in See attachment 3 2 Information Required from Customers Details of the information required from Demand Customers and Generators seeking connections or extensions to the Distribution System are provided in the Distribution Code Application forms for connection are available from DSP s offices and are on the DSP s s website Specifically the following information may be requested depending on the nature of the load 3 2 1 Geographical Location Site location maps and site layout plans in order to determine the location of the proposed load in
90. uency changes DCD39 Fundamental Frequency The operating or system Frequency of the Power System Parameters whose Frequency is the same as the fundamental Frequency are referred to as fundamental parameters DCD40 Generating Plant A power station with one or more Generating Units DCD41 Generating Unit An apparatus which produces electricity DCD42 Generator A person who generates electricity DCD43 Good Industry Practice The standard of practice attained by exercising that degree of skill diligence prudence and foresight which would reasonably and ordinarily be expected from a skilled and experienced operator engaged in the same type of undertaking under the same or similar circumstances DCD44 Grid Code The Saudi Arabian Grid Code DCD45 Harmonics Sinusoidal currents with a Frequency equal to an integer multiple of the fundamental Frequency DCD46 High Voltage A voltage used for the supply of electricity the lower limit of nominal RMS value of which is greater than 100kV DCD47 IEC International Electrotechnical Commission 74 Issue 01 Revision 00 November 2008 The Saudi Arabian Distribution Code DCD48 DCD49 DCD50 DCD51 DCD52 DCD53 DCD54 DCD55 DCD56 DCD57 DCD58 Isolated Disconnected from associated equipment by an isolator or adequate physical separation kVA Kilo Volt ampere Low Voltage A voltage used for the supply of electricity the upper limit of nominal RMS value of which

The Saudi Arabian Distribution Code

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