Medium-Voltage distribution
Contents
1. Safety and intervention instructions personal protection equipment tools and indication Please refer to the local regulations and legislation PE90037 DEAIO7EN indd Golden rule All work performed on equipment or premises where there is a risk of electric shock must preferably be carried out on an installation that is powered off to ensure that the installation and the engineers are electrically safe Failure to comply with these safety measures can cause serious accidents or even prove fatal to the employees Schneider Electric 23 Appendices For your safety personal protection equipment Over gloves Faceshield and related products ai Schneider DEAIO7EN indd ES Electric For your safety tools and signs DE90009 DE90013 DE90014 DE90018 te Q O LL QO DE90019 DE90010 Insulating material DE90016 Insulating material DE90011 DE90020 DE90012 DE90017 DE90021 DE90025 DE90031 DE90022 EN 7 090028 EN 0 DE90032 DE90023 DE90026 DE90029 DE90033 EN DE90024 DE90027 EN DE90030 DE90034 DEAIO7EN indd Schneider Be ES Electric Maintenance and Services Guide Medium Voltage distribution 24 kV Schneider Electric Industries SAS As standards specifications and designs change from time to time please ask for confirmation of Head Office the information given in this publication 35 rue Joseph Monie2. Take account of all the power supply sources and in particular any possible power supplies outside the cubicle in which the equipment is installed e Handling this product requires the appropriate skills related to the protection of electrical networks Only engineers with the relevant skills are authorised to configure and adjust this product e Before carrying out a dielectric strength test or an insulation test on the cubicle in which the Sepam is installed disconnect all the Sepam connection wires High voltage tests may damage the electronic components The protection system comprises protection relays and measuring devices Sepam circuit breakers instrument transformers Failure to com ply with these instructions may result in serious or fatal injuries DEAIO7EN indd Sepam protection relay maintenance General The logic inputs and outputs and analogue inputs are the parts of Sepam that are the least well covered by the self tests They should be tested during a maintenance operation It is recommended that preventive maintenance be carried out every five years For the list of Sepam self tests please refer to the operating instructions and technical reference guides at your disposal Maintenance tests Carry out all the commissioning tests recommended for the type of Sepam to be tested apart from the test specific to the earth leakage protection function which is not necessary Depending o
3. utilisation Electrical network protection Sepam series 80 Installation use commissionning and maintenance Operation manual Disjoncteur Notice d utilisation SF2 fixe Circuit breakers Instructions for use SF2 fixes Disjoncteur Notice d utilisation SF1 fixe a commande GMh Circuit breakers Instructions for use Fixed SF1 with GMh operating mechanism RM6 Remplacement d une commande Q Replacing a Q operating mechanism Notice d utilisation SF disjoncteurs d brochables MCset4 Instruction for use Draw out SF circuit breakers in MCset4 User manual Evolis circuit breaker 24 kV Installation guide Evolis circuit breaker 24 kV User manual Evolis 24 kV Earthing truck Installation guide Earthing switch up to 24 kV SMALT DEAIO7EN indd Safety glossary DANGER Risk of electrocution burns or explosion Before taking any action remember that to avoid any accidental contact with live parts all the equipment must be powered off before each operation Check that there is no voltage present on any incoming and feeder areas Every operation carries a risk of electrocution burns or explosion inside or outside the equipment Only qualified engineers are authorised to inspect and repair the equipment and comply with all the safety requirements In the event of a problem during a maintenance operation Please contact your usual Schneider Electric representative
4. 07897591EN User manual Evolis 24 kV Earthing truck 07897608EN Installation guide Earthing switch up to 24 kV SMALT DEAIO7EN indd Schneider i Electric Operations to be performed Sepam protection relay maintenance The Sepam range of protection relays is suitable for all Medium Voltage public or industrial distribution network protection applications They satisfy the requirements of IEC 61850 The range consists of three series of relays in ascending order of performance PE55170 14 e Sepam series 20 for usual applications e Sepam series 40 for demanding applications e Sepam series 80 for customised applications All function protection e effective protection of people and property e accurate measurements and detailed diagnosis e integral equipment control e local or remote indication and operation Safety instructions e Only qualified operators familiar with all the installation instructions are authorised to work on the facility e Switch off all power supplies before working on this equipment e Always use an appropriate voltage detection device to check that the power supply is off e Before carrying out visual checks tests or maintenance operations disconnect all current and voltage sources Start from the principle that all the systems are powered on until they have been completely powered off tested and labelled Pay particular attention to the design of the power circuit
5. in heavy industry such as refineries the iron and steel industry paper mills the petrochemical industry etc When these pollutants are combined with humidity they are highly corrosive for the parts used in our equipment e bare copper silvering for electrical contacts e control mechanisms If it is not completely protected by enclosures providing a sufficiently high degree of protection IP the Medium Voltage equipment must be cleaned at regular intervals to guard against deterioration due to pollution Cleaning is a critical process The use of inappropriate products may cause irreversible damage to the equipment For cleaning procedures please contact your usual Schneider Electric representative About pollution problems Schneider Electric If no precautions are taken pollution will be deposited on The maintenance programme must be carried out on the cubicles as soon as they are commis sioned and then every three years at most the maintenance operator must have the required skill level These operations apply to the H S specific MCset switchboard for the environmen tal and operating conditions specific to the conditions as defined e the insulating parts causing deterioration via a corona effect crackling and tracking e the metal parts causing corrosion Remedies to reduce and or remove the consequences of exposure to large amounts of pollution e fit grilles V shape
6. may be accelerated if it is used too frequently mechanical malfunctions may occur if it is not operated for a long period of time Regular operation is necessary to maintain the original performance of each operating unit Interlocking with keys or padlocks must be fully tested to check that they are working correctly PE90020 PE90022 PE90021 DE90035 Equipment must be OFF Dust impacts aggressive atmosphere insufficient or excessive lubrication may adversely affect the mechanical operation of a device 1 MCset4 medium voltage compartment flap control 2 MCset4 voltage transformer extraction truck 3 MCset4 rack out circuit breaker guide rails DEAIO7EN indd DE90036 Do not walk on the parts Insulating materials and vents enti by this pictogram Dust deposited in various parts of the cubicle may adversely affect the electrical operation of a Medium Voltage device Dust removal Insulating materials Note too much dust on insulating materials may generate partial discharges that may ultimately cause dielectric flashover or internal arcing As for the control mechanisms a vacuum cleaner must be used to extract the dust For parts that are difficult to access use a dry cloth taking care not to accumulate any dust on the insulating material During this operation check that there is no foreign matter corona or partial discharge indicated by a change of colour or degradation
7. of the insulating material Air vents Note the air vents must also be cleaned to help the air to circulate in the cubicle and avoid overheating In all cases the cubicle must be thoroughly cleaned especially the back of the cubicle A vacuum cleaner must be used to extract the dust Natural ventilation is required for the cubicles Such cleaning is mandatory for versions with forced ventilation fans mounted on the top of the cubicle The frequency of these operations depends on the environmental and operating conditions PE90016 PE90017 1 NEX24 insulating supports 2 NEX24 air vents DEAIO7EN indd Schneider a Electric Operations to be performed Power circuits The connections between the various switchboard distribution systems busbars cables and the switchgear are an important source of heat dissipation Sliding connections rack in They consist of two parts clip and rack in connector This type of connection requires appropriate regular cleaning in accordance with the procedures described The grease makes it easier to connect the clips and rack in connectors and prevents damage to the silvered surface by reducing the rack in force In the case of a sulfiding corrosive atmosphere H2S SO2 the indications specific to each range must be observed Special greases can be used to protect silver and copper plated contacts from sulphurisation Silver or copper sulphides reduce contact qualit
8. transformer fuses if necessary replace the three fuses at the same time 15mn Please see the list of technical reference guides 1h30 mn Check the fuses in the feeder cubicles fitted with fused switches if necessary replace the three fuses at the same time 1h30 mn Removable devices Remove and replace the circuit breaker MCset 4 Remove and replace the rack out circuit breaker NEX24 Remove and replace the voltage transformer frame 15mn Please see the list of technical reference guides Check the operation of the position contacts Removable racked in or racked out part Aao Earthing switch me Racked out voltage transformer ree Replace the grease on the rack in Grease for connectors electrical use Control mechanisms p 8 Open close the moving parts manually and electri cally refer to the switchgear specific documents Open close the earthing switch manually Remove the dust and grease the earthing switch oa Mobilith SCH100 grease to be applied 30 mn 30 mn oS En m 50m i 30 mn Please see the list of technical reference guides 3 4 D Remove the dust and grease the flap control Remove the dust from the moving part En guide rails 30 mn Operate the key operated interlocks Operate the rack in inhibition E D _ mechanism 15mn O e a gt O 3 O pm Q O o wn ee I F Insulating mater
9. Medium Voltage distribution 24 kV Metal enclosed withdrawable Switchgears e MCset4 SF6 technology e NEX24 vacuum technology 2008 Maintenance and Services Guide October 2008 Schneider Electric A brief summary of the 24 kV range This Maintenance and Services Guide applies to 24 kV Medium Voltage distribution metal enclosed withdrawable switchgears MCset4 SF6 technology PE90026 NEX24 vacuum technology PE56388 gt MCset is metal enclosed switchgear with rack out units designed for indoor installation MCset is designed for the MV section of HV MV substations and high power MV MV substations MCset4 catalogue available AMTED 306032FR AMTED 306032EN 04 2008 gt NEX24 is indoor metal enclosed switchgear designed for the MV section of HV MV and MV MV substations It is a medium voltage equipment comprising cubicles with breaking devices sensors Medium Voltage connections and auxiliaries NEX24 catalogue AMTED 306006EN 07 2008 Maintenance and Services Guide MV Distribution 24 kV Distribution DEAIO7EN indd Foreword General Operations to be performed e Control mechanisms e Insulating materials and vents e Power circuits e Auxiliary circuits e Circuit breaker maintenance SF6 Vacuum technologies e Sepam protection relay maintenance Recommended frequenc
10. a process are as follows e damage due to jet pressure and impossibility of relubricating inaccessible fixing points e risk of overheating due to solvent pressure in contact areas e removal of special protection A dry cloth must be used for cleaning Important Insulating parts must be cleaned with a soft dry lint free cloth degreaser aerosols are absolutely forbidden the part to be cleaned Schneider Electric Circuit breaker maintenance operations such as visual checks cleaning with a degreasing agent removal replacement checking for wear dust removal etc are detailed and explained in the technical reference guides at your disposal The operations are carried out on the pole enclosure the control parts springs control unit latching mechanism gear motor and the pole mechanism Cleaning processes that involve spraying a pressurised insulating solvent and using The parts must be cleaned to remove the old grease before new grease is applied An electrical or mechanical solvent cleaner must be used for cleaning depending on DEAIO7EN indd Circuit breaker maintenance Rack out circuit breaker with vacuum technology Prerequisites Before carrying out any work e open the device e remove the device from the cubicle e switch off the supply to the power and auxiliary circuits e release the opening mechanism if necessary The device is designed to be used for 10 year
11. anisms Safe operation will be maintained by general dust removal cleaning appropriate lubrication and using the device regularly Dust removal Cleaning Degreasing Lubrication Operation 8 Schneider Electric vacuum cleaner must be used for this operation Do not use compressed air for this cleaning operation A completely clean dry cloth or brush free from any kind of solvent must be used for this operation High pressure spraying with products containing solvents trichloroethane trichloroethylene is strictly prohibited The main disadvantages of such spraying may be e impossibility of reapplying grease to inaccessible lubrication points greased for life e corrosion or friction on non regreased areas e deterioration due to jet pressure e risk of overheating due to the presence of insulating solvent on the contact areas e removal of special protection e deterioration of plastics This operation is carried out after certain mechanical joints such as those described in the maintenance procedures have been cleaned Greases recommended by Schneider Electric must be used Never apply too much grease because excessive greasing combined with dust can cause the mechanism to malfunction Grease must never be applied to insulating parts The requirement for an installation to run continuously generally means that the power devices are seldom operated Although the ageing process of a device
12. equipment and operators are protected Electronic components and cards are sensitive to the environment ambient temperature humid and corrosive atmosphere and to harsh operating conditions magnetic fields vibrations etc To ensure safe operation the following must be checked at regular intervals e the tripping chain e the intervention times according to fault current levels Auxiliary wiring Auxiliary wiring is used to transmit orders to the various control units of the device and retrieve its states A degraded connection or insulating material may prevent the device from operating or cause unwanted tripping The auxiliary wiring must be checked and replaced at regular intervals if necessary especially in the event of vibrations a high ambient temperature or corrosive atmospheres Indication contacts The contacts indicating the position of the circuit breaker earthing switch voltage transformer truck and ready to operate circuit breaker allow the operator to view the states and to act accordingly Any incor rect indication can lead to device control errors that may endanger the operators Contact failure worn contacts loose terminals may be the result of vibrations corrosion or abnormal overheating preventive maintenance must ensure good continuity or non continuity of the contact in the different states PE90024 MO D mn S MAC MCset4 Low voltage compartment DEAIO7EN indd For f
13. he fuse ratings DEAIO7EN indd Schneider ji amp Electric Appendices Technical reference guides Conditions for intervention and special equipment Please see the available technical reference documents MCset4 2 07897546 FR EN E 07897542 FR EN 07897541 FR EN NEX24 J ae 51190295 FO EN 51190297 FO EN _ 51190298 FO EN Sepam protection relays 301005FR Sepam s rie 20 PE90000 301005EN Maruti dutana 2x 301006FR ga 301006EN 303003FR 303003EN Circuit breaker moving part EN 7896901 FR Erots 24 by Late nat PE90034 z 7896901EN EJ 07897134FR 07897134EN 07897401FE Vu comm 07896866FR 07896866EN 07897530EN 07897531EN 07897591EN 07897608EN 99 Schneider Electric G nie civil Civil engineering guide Notice d installation Installation instruction Notice d utilisation Instruction for use G nie civil Civil engineering guide Notice d installation Installation instruction Notice d utilisation nstruction for use Protection des r seaux lectriques Sepam s rie 20 Notice d utilisation Electrical network protection Sepam series 20 User s manual Protection des r seaux lectriques Sepam s rie 40 Notice d utilisation Electrical network protection Sepam series 40 User s manual Protection des r seaux lectriques Sepam s rie 80 Installation utilisation mise en service et maintenance Notice d
14. ials and vents p 9 Remove the dust from the air vents Outside 30 mn Please see the list of technical 30 mn reference guides Remove the dust from the fans MCset 4 on cubicles according to performance Remove the dust from the insulating materials CR Power circuits p 10 Check and retighten the connections if necessary Calibrated torque busbars CTs earthing switches cables wrench Control and indication auxiliaries p 11 Check that the auxiliary wiring is uninterrupted 1h30mn and the appearance of the insulating material Commissioning 1 Power down the cubicle according to its configuration in the switchboard for example the feeder cubicle 2 To be selected according to the fuse ratings DEAIO7EN indd Schneider m amp Electric UPS ES se fal oeo o ee ial I gt gt ow D x PE90036 20 Recommended frequency Operating conditions in a corrosive atmosphere The optimum recommended frequency is tailored to the product life cycle to anticipate requirements and optimise the global cost Note i v m 7 D pe LA 7 ET The operating conditions in certain fields of activity require additional measures to be included in the maintenance programme under normal conditions so that the impact of atmospheric pollutants can be taken into account Pollution SO sulphur dioxide H S hydrogen sulphide These types of atmospheric pollutants are mainly found
15. n the module installed voltage input tests may be required Give priority to testing the logic inputs and outputs which are involved in tripping the circuit breaker Testing the complete system which includes the circuit breaker is also recommended For information on how to maintain Sepam devices see the Commissioning chapters in the available technical reference guides Important Risk of damaging the Sepam e do not open the Sepam base unit DEAIO7EN indd Repairs by replacement when the Sepam or a module is deemed to be faulty replace it with a new product or module as these items cannot be repaired e do not attempt to repair Sepam components the base unit or accessories Failure to comply with these instructions may damage the equipment Schneider Electric 15 Operations to be performed Sepam protection relay maintenance Troubleshooting major or minor faults the list of self tests is available in the Control and monitoring chapter of the Sepam technical guides MAJOR fault Sepam is in the fallback position The failures detected are considered to be major faults PE50359 Major faults are MINOR fault Sepam is not working properly only cleared after The base unit is working all the protection devices activated the cause of the are operating and indicates that one of the optional modules is faulty fault is corrected or that a module is configured but not connected a
16. nance instructions Level Operations requiring simple procedures and or support equipment integrated into devices or external that is easy to use and implement Level Preventive maintenance operations such as general adjustment identification and troubleshooting repairs by exchanging components or functional units minor mechanical repairs carried out by a specialised technician using the tools and adjusting and measuring instruments specified in the manufacturer s maintenance instructions technique or technology and or the use of specialised support equipment All important corrective or preventive maintenance operations carried out by the manufacturer s after sales services Operations that may affect switchgear performance Level 4 Operations whose procedures involve knowledge of a specific particular techniques or technologies industrial processes or support equipment Equipment will generally have to be returned to the factory This applies only to moving parts Level 5 Operations whose procedures involve know how requiring the use of Training Schneider Electric offers a wide choice of training courses on how to operate or maintain its equipment Level 3 4 5 operations require training on the equipment Training programme This training is delivered in our training centres by Schneider Electric s accredited qualified staff DEAIO7EN indd Schneider Electric Operations to be performed Control mech
17. nd Sepam is switched on again Self tests A number self tests are performed in the Sepam base unit and additional modules The purpose of these self tests is to e detect faults that may lead to unwanted tripping or to a failure to trip 1 when a fault occurs R e put the Sepam in a safe fallback position to avoid any unwanted action B Srrzea1 e notify the operator that a maintenance operation is required Sepan caguivis In practical terms the Sepam Diagnosis software screen provides Fault tes al access to information on the status of the base unit and optional on display major fault modules According to the type of faults detected these pages contain descriptions of the alarm messages the possible causes and the corresponding actions remedies List of self tests to be consulted in the technical reference guides at your disposal MT10848 Sepam Diagnosis screen SFT2841 m Schneider DEAIO7EN indd Electric MT50298 Sepam protection relay maintenance About the test and measuring equipment In short the equipment required will contain the following devices e generators Sinusoidal AC current sinusoidal AC voltage and DC voltage e measuring instruments ammeter voltmeter phasemeter e the basic IT equipment correctly configured PC software and connection cables e the reference documents comprehensive connection diagrams for the Sepam device and its additional mod
18. on diagnosis e if required an appropriate maintenance programme e an appropriate maintenance contract e adjustments where necessary Electrical authorisation recognition of a person s ability to carry out the tasks assigned to him in complete safety The scope and limitations of such tasks are specified in the authorisation document Only employees holding an electrical authorisation document will be allowed to carry out these maintenance operations This document is not intended to be used as a guide by anyone who has not completed the relevant training In the event of a problem during a maintenance operation please contact your usual Schneider Electric representative DEAIO7EN indd Intervention levels Different skill levels have been established to define the persons who are competent to work on Medium Voltage equipment The five intervention levels developed follow the life cycle of the equipment whilst at the same time defining the levels of complexity Level 1 Regular maintenance The maintenance operations to be carried out on the equipment are generally described in the instruction handbook They include minor preventive maintenance operations not requiring the removal of any parts of the equipment and servicing by replacement with standard parts provided for this purpose carried out by a technician authorised to do so by the user according to the manufacturer s mainte
19. p 8 Open close the moving parts manually and electri cally refer to the switchgear specific documents Open close the earthing switch manually o 30 mn Please see the list of technical reference guides as Op Remove the dust and grease the earthing switch control EE Mobilith SCH100 3 4 grease to be applied to th rt Remove the dust and grease the flap control r OAOE Pelt Remove the dust from the moving part guide rails Operate the key operated interlocks o Operate the rack in inhibition mechanism Insulating materials and vents p 9 15mn as oo Ro Po I I I I gt oo CO gt CO IR Remove the dust from the air vents Outside E 30 mn Please see the list of technical Inside 30 mn reference guides Remove the dust from the fans MCset 4 on cubicles according to performance CO CO I I I R gt CO gt Remove the dust from the insulating materials i 3 Power circuits p 10 Check and retighten the connections if necessary Calibrated torque busbars CTs earthing switches cables wrench Control and indication auxiliaries p 11 Check that the auxiliary wiring is uninterrupted 1 14h30mn and the appearance of the insulating material Check te pig han OS ee Commissioning 1 Power down the cubicle according to its configuration in the switchboard for example the feeder cubicle 2 To be selected according to t
20. r CS 30323 AY This document has been 92506 Rueil Malmaison es printed on ecological paper www schneider electric com Publishing SYNTHESE ECA Schneider Electric Printing DEAIO7EN 10 2008 ART960247 Schneider Electric Industries SAS All rights reserved
21. s or 10 000 operations in normal use in compliance with IEC 62271 Recommendations e Open Close Description Action Frequency Supplies Medium Circuit breaker propulsion truck Linear cam Clean with 10 years Non chlorinated Cloth at least once a year a degreasing agent grease solvent e Perform a visual Grease Isoflex Topas L152 grease Brush check at least every Worm screw Clean with 10 years Non chlorinated Cloth five years a degreasing agent grease solvent Grease Isoflex Topas L152 grease Brush Circuit breaker notching pins and fingers in the bushing Clean with 10 years Non chlorinated Cloth a degreasing agent grease solvent Conditions for intervention and special equipment Please see the technical reference guides at your disposal 8 FER 7896901 FR Disjoncteur Notice d utilisation SF2 fixe a un 7896901EN Circuit breakers Instructions for use SF2 fixes 07897134FR Disjoncteur Notice d utilisation SF1 fixe commande GMh 07897134EN Circuit breakers Instruction for use Fixed SF1 with GMh operating mechanism Ba gt 07897401FE RM6 Remplacement d une commande Q Replacing a Q operating mechanism 07896866FR Notice d utilisation SF disjoncteurs d brochables MCset4 07896866EN Instruction for use Draw out SF circuit breakers in MCset 4 07897530EN User manual Evolis circuit breaker 24 kV 07897531EN Installation guide Evolis circuit breaker 24 kV
22. t Altitude e less than or equal to 1000 m the maintenance e above 1000 m a derating coefficient will be applied Spear must have the required skill level please consult us These operations are applicable for Humidity e average relative humidity over 24 hours lt 95 the environmental and e average relative humidity over 1 month lt 90 operating conditions e average vapour pressure over 24 hours lt 2 2 kPa that meet the normal e average vapour pressure over 1 month lt 1 8 kPa service conditions in accordance with IEC 62271 1 for indoor switchgear PE5637 1 About condensation Condensation is the transformation of a gas or vapour into liquid It occurs in air when the latter is saturated with water vapour and results in the formation of liquid water Remedies to reduce and or resolve condensation problems e provide optimum ventilation conditions e avoid temperature variations DE52970 S M bi e remove any sources of humidity in the vicinity of the substation ee e install an air conditioning system 6 e ensure that the cabling conforms to the applicable rules e consider the resistors 48 Schneider DEAIO7EN indd Electric Check Frequency Tools Products Intervention Power down Approximate Reference intervention document time Cubicle LenS Switchgear Visually check the general condition of 1 the cubicle front panel control unit box frame Check the voltage
23. to the substation vents to minimise the ingress of dust and pollutants e keep the substation ventilation to the minimum required to evacuate the heat generated by the transformer thus minimising the ingress of dust and pollutants e use Medium Voltage cubicles with a sufficiently high degree of protection IP e use air conditioning systems with filters to minimise the ingress of dust and pollutants DEAIO7FR indd Check Frequency Tools Products Intervention Power down Approximate Reference intervention document time Cubicle LS Switchgear Visually check the general condition of 15mn Please see the cubicle front panel control unit box frame the list of technical reference guides Check the voltage transformer fuses i 1h30 mn if necessary replace the three fuses at the same time Check the fuses in the feeder cubicles fitted 1h 30 mn with fused switches if necessary replace the three fuses at the same time Removable devices Remove and replace the circuit breaker MCset 4 15mn Please see Remove and replace the rack out circuit breaker the list of technical NEX24 reference guides Remove and replace the voltage transformer frame Check the operation of the position contacts Removable racked in or racked out part SS LI Earthing switch a oo 30mn 30mn Racked out voltage transformer ns 30mn Replace the grease on the rack in Grease for connectors electrical use Control mechanisms
24. ules bills of materials and hardware installation rules all the Sepam parameters and settings available in paper format Conditions for intervention and special equipment Please see the technical reference guides at your disposal 301005EN Electrical network protection Sepam series 20 User s manual 301006EN Electrical network protection Sepam series 40 User s manual 303003FR Protection des r seaux lectriques Sepam s rie 80 Installation utilisation mise en service et maintenance Notice d utilisation Electrical network protection Sepam series 80 Installation use commissionning and maintenance Operation manual DEAIO7EN indd Schneider Electric 301005FR Protection des r seaux lectriques Sepam s rie 20 Notice d utilisation 301006FR Protection des r seaux lectriques Sepam s rie 40 Notice d utilisation 17 Recommended frequency Normal operating conditions The optinum recommended frequency is tailored to the product life cycle to anticipate requirements and optimise the global cost Ambient air temperature e less than or equal to 40 C e less than or equal to 35 C on average over 24 hours e above or equal to 5 C The maintenance programme must be carried out on Environment e no dust smoke salt corrosive or flammable gas and vapour the cubicles as soon clean industrial air as they are commis sioned and then every five years at mos
25. urther information please see the following pages which describe how to maintain Sepam devices Schneider ii Electric 12 Operations to be performed Circuit breaker maintenance A circuit breaker is a safety device used to operate and protect electrical distribution networks It is fitted in a cubicle to protect all the downstream components in the event of a short circuit Rack out circuit breaker with SF6 technology Checking the internal pressure of the circuit breakers The internal pressure of the circuit breakers must only be checked in the event of an SF6 alarm and such checks must be performed by Schneider Electric s specialist engineers The SF6 circuit breaker is classed as a sealed system When it is manufactured the leakage rate of each enclosure is measured We can therefore be sure that the leakage rate is less than the loss specified in the standard If an SF6 pressure drop is indicated you are advised to remove the circuit breaker from service and call in Schneider Electric to diagnose the fault in the malfunctioning device Pole maintenance The pressurised SF6 gas inside the poles retains all its dielectric properties after breaking Electrical endurance is limited by contact wear Contact wear depends on how much the device is used We wish to draw your attention to the dangers of using a cleaning process that involves spraying solvents at high pressure The main disadvantages of such
26. vicing operations Schyelder General Warning As Medium Voltage devices fulfil safety functions they must be installed in accordance with certain professional practices Similarly preventive maintenance operations must be strictly and regularly observed PE90000 Electrical devices must be maintai ned by specialist electrical engi neers 6 Schneider Electric Certain maintenance operations can be carried out independently by the Customer Two skills are essential e electrical qualifications e knowledge of the equipment to be maintained Other very complex operations are however exclusively the responsibility of Schneider Electric This guarantees that Customers enjoy optimised maintenance with respect to the economy security and availability of electrical energy e the engineers are highly qualified and have a thorough knowledge of Schneider Electric s equipment and its various technical levels they have all the methods and procedures specific to the different types of devices at their disposal as well as the advantage of feedback from the whole company e they have the relevant diagnostic tools and equipment for the system they are working on e they carry with them the full catalogue of the appropriate consumables and spare parts for each device which are available from local or regional stocks On request Schneider Electric will be able to provide at any time e an installati
27. y e Normal operating conditions e Operating conditions in a corrosive atmosphere Appendices e Technical reference guides e Safety glossary e For your safety reminders Personal protection equipment Tools and signs Scypeider 800064 Foreword Maintenance and Services Guide Medium Voltage distribution 24 kV Maintenance of the equipment responsibility Electrical equipment may only be maintained by qualified engineers Schneider Electric accepts no responsibility for the consequences that may result from the use of this document Operation of the equipment user s responsibility The user is responsible for checking that the equipment ratings are appropriate for its intended use You must read the operating and installation instructions prior to commissioning or maintenance and comply with them Failure to comply with these requirements may affect the correct operation of the equipment and constitute a hazard for the workforce and the equipment Protective earthing The user is responsible for conforming to all the standards and international and national electrical codes in force regarding the protective earthing of all the equipment DEAIO7EN indd gt Your Maintenance and Services Guide contains general instructions for e reducing equipment wear and tear and or failure e ensuring that the equipment is safe during all installation repair and ser
28. y They cause the contact resistance to increase which results in increased overheating As grease deteriorates over time it must be replaced regularly Fixed connections connection by lugs or busbars This type of connection does not require special maintenance if it is carried out according to Schneider Electric s recommendations torque class 8 8 screws and bolts and contact washer Otherwise regularly check the heating points change in the colour of the copper surface defect and remove the connection polish the contact parts and reassemble them with new screws and bolts Standard tightening torques non greased screws and bolts Schneider Electric The table opposite indicates the tightening torques for class 8 8 screws and bolts with contact washer and nut PE90018 PE90023 Any tightening that does not conform to the recommenda tions can cause a thermal runaway resulting in the degradation of the device insula ting materials and cables which may degenerate into a short circuit and or fire Screw 6 8 10 12 14 Torque in Nm 1 NEX24 power connections 2 MCset4 cable connection DEAIO7EN indd Low Voltage auxiliary circuits e Protection relay e Auxiliary wiring e Indication contacts Protection relay An electrical fault on the installation is detected by the relay which orders the circuit breaker to open in order to ensure that the
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