ICEE15A-462
Contents
1. PW 7012 AA EN SNS O7 0 Existing 92 MW New 27 MW Fig 5 Single line diagram of SCADA system between ABCD power plant amp PEA s SCADA Control Center For the implementation of this scenario in this paper the universal device which is able to work as either in RTU mode or Gateway protocol converter mode has been applied REMSDAQ Callisto Utility Controller CaSE NX User Manual 2014 5 FACTORY ACCEPTANCE TEST AND COMMISSIONING TEST In order to validate that the newly improved protection scheme is able to operate properly both the factory acceptance test FAT Test and the commissioning test after installation are mandatory The FAT test procedures utilize the hardware test tools and also the special simulation software The commissioning test was done under the special condition that needs all three parties to operate the teleprotection scheme and SCADA system simultaneously In fact the teleprotection scheme is mainly tested by EGAT and the SCADA system is mainly tested by PEA Figure 6 illustrates system configuration for the FAT test of teleprotection cabinets This was done by simulating the connection between two teleprotection cabinets at both ends EGAT and ABCD then connecting with actual devices in the simulation The PTT and DEF signals are simulated by relay protection of each side The injected voltage and current to the relay was created by a test tool OQMICRON CMC 356 Universal Relay Te2. Dn Nn Pass z o Z n S Pass gc Pass sul go Pass ro Q ile S o Dn yn nm an Distance Relay Phase C Norma Distance Relay Earth Fault Normal Trip Pas Pas nN Distance Relay Trip Normal Trip Pass Pass Distance Relay Zonel Normal Trip Pass Pass Distance Relay Zone2 Normal Trip Pass Pas Distance Relay Zone3 Normal Trip Pas Pass Distance Relay Switch on fualt_ Normal Trip Pas Pass l i N Distance Relay VT Supply Directional Overcurrent Phase A W Directional Overcurrent Phase B Nn Directional Overcurrent Phase C 1 Directional Earth Fault Directional Relay DC Supply 1 Teleprotection DTT I Line Aided Trip PTT I DC Supply Control Circuit 1 AC Supply Control Circuit 37 Trip Cet Supervision 1 WIVI INININININININ ININ ejelejeleiejejeje Table 8 Test results of the Control Output points of SCADA system Monitoring at STATE location Pass Fail 0o i DCS Control Center 01YB 01 CB Close Open Command 01YB 01 Close Bypass Sync Command Close Pass Pass 01YS 01 DS Close Open Command 4 POINT NAME Table 9 Test results of the Analog Input points of SCADA system UNIT location Pass Fail ACTUAL RAW ABCD s PEA s SCADA 6 VoltagePhaseCA kv 0 150 0 32767 Pass Pas Hz 060 032767 Pas Pas Frequency Hz
3. lae f far feed iesi kesi lar f ler aeeeee n n OJO tH 4 Nn es io IS Directional Relay DC Supply ormal Time Delayed CB Fail Normal zZ tH Teleprotection DTT Normal Line Aided Trip PTT JE lglg Z ea ormal Normal Normal Normal Normal Operate Lockout Normal N Normal Normal Normal Fail No Equipment _ ormal Fail Not Support Normal Trip NoEquipment ynchomizing Check Normal Operated _ No Equipment ync Relay MCB Trip Normal Alarm No Equipment nder Over Frequency Step1 ormal Alam Notuse function ormal Trip Notusefunction nder Over Voltage Step1 Normal Alarm Notuse function nder Over Voltage Step2 Normal Trip Notuse function 47 Under Over Instance Normal Trip Notusefunction 48 _ Under Over Frequency Relay Undefine On Off Fault Not use function 49 Sync Switch Selection Normal Off No Equipment gt 1 mm Ty fes D jo jo a had ia Gi Lockout F ge alala fab Z i Z IZ Z Table 2 Analog Input points list of PEA s requirement SCALE Connection type POINT NAME UNIT ACTUAL RAW at ABCD DATA DATA Copper wires 6 Voltage PhasecA kv o1so 0 32767 Copperwires A1 7 Frequency Hz 060 0 32767_ Copper wires A1 MW Al 0 PowerFactor
4. Distance relay zone 3 Distance relay zone 4 Traditional PTT Carrier Signal Protection Protection in POTT scheme Distance Distance amp Protection PTT carrier Setting A F Setting A F parameter parameter 31 6 lt 00 28 4 300 0 319 0 lt 40 0 600 0 618 0 600 0 z9 lt w0 300 0 322 1 lt 40 0 600 0 620 4 600 0 600 0 626 5 600 0 6 l 8 Table 6 Test results of a DEF carrier signal protection scheme Fault Function Sub station Operating time ms Traditional Protection DEF Carrier Signal Protection Directional Earth Directional Earth Fault Protection Fault amp DEF carrier Setting A F Setting A F parameter parameter ABCD Directional Earth Fault 600 0 619 8 EGAT Directional Earth Fault 600 0 620 4 EEE o l itnn Bia OELE I 7 gt ABB REL670 I L L L L L i i i i i p b ABCD power plant Ree e ee eee ew ew ake eo ee eo ee oe oe Voltage amp Current Omicron CMC356 Voltage amp Current Erel ee eferus o 100BASE FX Ethernet 10 100BASE T Ethernet RS 232 Serial Al Analog Input points list HIRCHMANN RSPL 20 Ethernet Switch Remsdagq Callisto RTU amp Gateway Al DI Copper wires dry contact DI Digital Input points list Fig 7 System configuration of RTU cabinet for FAT test Figure 7 illustrates system configuration of RTU cabinet FAT test The FAT test of the RTU cabinet was done by simulating th
5. 0 100 0 32767 Copper wires A THD Current Harmonic Phase A 0 100 0 32767_ Copper wires THD Current Harmonic PhaseB 0 100 0 32767 _ Copper wires THD Current Harmonic PhaseC 0 100 0 32767 _ Copperwires A THD Voltage Harmonic Phase A B 0 100 0 32767 _ Copper wires _A Table 3 Control Output points list of PEA s requirement Connection type 0 1 Comection Type 2 01YB 01 Close Bypass Sync Command Close TEC61850 SBO The single line diagram of ABCD SCADA system and PEA s SCADA Control Center is illustrated in Figure 5 To implement this SCADA scheme the RTU cabinet must be installed at ABCD power plant to link up with PEA s SCADA Control Center via the existing PEA s fiber optic network over Synchronous Digital Hierarchy SDH multiplexer MUX at PEA RY1 substation Each of the RTU cabinet consists of e An Ethernet switch to communicate between IED REL670 and RTU this paper uses HIRSCHMANN RSPL 20 Rail Switch Power Lite Reference Manual Rail Switch Power Lite RSPL 2008 e A Remote Terminal Unit RTU for collecting parameters in ABCD power plant and sending out to gateway A gateway protocol converter will do the conversion two different protocols between PEA DNP3 protocol and the internal ABCD IEC 61850 PEA s SCADA Control Center PEA CHONBURI Province aue M EGAT co PEA RAYONG 1 a RAYONG 1 1YB 01 a 115 kV
6. 92 MW New 27 MW Fig 1 Existing connection scheme between ABCD and two utilities 3 PROPOSED DIRECT TRANSFER TRIP DTT TECHNIQUE WITH CARRIER SIGNAL PROTECTION SCHEME PTT AND DEF A DTT Technique with Carrier Signal Protection Scheme PTT and DEF is sending receiving signals of the teleprotection between EGAT substation and ABCD power plant to disconnect a circuit breaker at both ends Because faults occur in transmission lines between both substations to clear fault instantaneous regardless of the time delay from relay protection Emil Bartosiewicz et al 2013 The scheme of teleprotection according to EGAT s requirement is illustrated in Figure 2 The signaling scheme of DTT PTT and DEF relies on digital teleprotection for sending receiving signals via fiber optic cables to Multiplexer FOM Then FOM will convert signals from E1 G703 terminal to fiber optic cables for interconnection of both substations Equi t Signat naljE ent T ee PTT Ait PTT IGITAL E1 G703 E1 G703 DIGITAL hal N LP EPROTECTION H re LEPROTECTION B 4 LP DEF AER ea 7e DEF n optic m e1 7 At EN sm e e nuo Equipment Signa a a A2 Signal Equipment EA CB jon 1 079 1679 lea gmorecrenla2 0TT CB uaa Se m C2r z LEGEND n fo LP LINE PROTECTION DISTANCE amp DIRECTIONAL RELAY 4 2 1 SEND 2 RECEIVE SY 4 CB 115 k
7. PROTOCOL As mentioned before ABCD is selling the electricity via PEA s transmission line system In order to complete the interconnection ABCD must also comply with PEA s new SCADA regulations for interconnection to PEA grid so that PEA will be able to monitor and control real time parameters 1 e power flow energy relevant parameters and having access to other equipment in ABCD power plant PEA also asks to have access to monitor real time statuses of the teleprotection scheme between EGAT RY1 substation and ABCD substation via PEA SCADA Control Center PEA would allow all of the transmission parameters over any protocol but it must have some kind of gateways for converting those parameters into PEA DNP3 protocol PEA parameters requirements are called Input Output points list I O points list The PEA I O standard points list consists of at least 1 Status Input 49 items 2 Analog Input 16 items and 3 Control Output 4 items as shown in Table 1 to Table 3 respectively ABCD power plant is currently using IEC 61850 protocol to communicate between Intelligent Electronic Device IED 1 e relay protection power meter and etc Christoph Brunner 2008 Therefore the I O points list will be sent out to Remote Terminal Unit RTU to link up with PEA s SCADA system over IEC 61850 protocol using copper wires Table 1 Status Input points list of PEA s requirement Connection type DEMME o 2 3 Comection T
8. 8 Active Power MW 0 155 88 0 32767 9 Reactive Power Ss MVAR _4 0 155 88 0 32767 10_ Power Factor Finally Figure 8 9 and 10 presents the actual work process for on site implementation for the new teleprotection scheme and the SCADA system including all the new extra RTU cabinets Fig 8 Left FAT test of the Teleprotection cabinets and Right FAT test of an RTU cabinet Fig 9 Left Teleprotection cabinet installed at ABCD and k Right Teleprotection cabinet installed at EGAT RY1 substation N IES A Fig 10 RTU cabinet installed at ABCD Power Plant 6 CONCLUSIONS The proposed DTT teleprotection scheme with carrier signals PTT and DEF has now been in operation in ABCD power plant for around six months already The SCADA system of ABCD power plant is also in operation and already linked up with both EGAT s and PEA s SCADA system and it is now working properly and smoothly The proposed system has been insured the stability and reliability throughout the process of tentative FAT test and commissioning test The proposed teleprotection scheme with SCADA system is able to resolve the aforementioned issue of a very unique manner interconnection problem This particularly case study shall be used as a very good example for the future to come and similar circumstance in Thailand ACKNOWLEDGEMENTS I would like to highly thank you my supervisor Dr Chow Chompoo inwai for the patient gui
9. The Interoperability of the New Direct Transfer Trip DTT Technique with Carrier Signal Protection Scheme PTT and DEF and SCADA System between two Utilities in Thailand CHOTIWANAPORN Naradon AUNGKUM Athiruk and CHOMPOO INWAI Chow Electrical Engineering Department Faculty of Engineering King Mongkut s Institute of Technology Ladkrabang KMITL Ladkrabang Bangkok THAILAND 10520 naradon_2002 hotmail com athiruk gmail com chompooc gmail com Abstract This research paper presents the case study of the concept and implementation for special protection scheme called Direct Transfer Trip DTT technique with Carrier Signal Protection Scheme Permissive Transfer Trip PTT and Directional Earth Fault Transfer Trip DEF to enhance the power system stability when connected the small power producer SPP to the system The case study here will talk about the scenario in natural gas type SPP named ABCD This SPP itself has a very unique manner that is ABCD usually earn its revenue from selling the electricity to Provincial Electricity Authority PEA via II5kV substation of Electricity Generating Authority of Thailand EGAT Both EGAT and PEA play some part in controlling how ABCD will generate and transfer the electricity through their own properties The recent status of the protection scheme in this SPP is that there are only distance and directional relays connected at both EGATs bus and ABCD ends without any interconnection The tr
10. V CIRCUIT BREAKER STATUS N FOM FIBER OPTIC TO MULTIPLEXER E T ORCOMBINATION PTT PERMISSIVE TRANSFER TRIP PA AND COMBINATION DEF DIRECTIONAL EARTH FAULT TRANSFER TRIP Y DTT DIRECT TRANSFER TRIP y NA Fig 2 Teleprotection scheme according to EGAT s requirement DTT signaling scheme relies on the status open of a circuit breaker at EGAT RY1 to send DTT signal Key for disconnecting a circuit breaker at SPP instantaneous to prevent SPP into islanding mode Chow Chompoo inwai et al 2014 The scheme of disconnect a circuit breaker at SPP must be depending on logic of EGAT s requirement Therefore two digital teleprotection units at SPP must receive exactly the same DTT signal AND logic to prevent the wrong trip from device s failure In general PTT signaling scheme relies on pilot tripping scheme of the distance relay In this case the Permissive Over Reaching Transfer Trip POTT is used POTT reads either over reaching zone 2 or initially extended zone lto generate tripping signal Key for remote relay Complete tripping signal will then be generated by distance relays after the fulfillment of two criteria e Local picking up either by over reaching zone 2 or initially extended zone 1 e Receiving remote tripping signal from another substation Emil Bartosiewicz et al 2013 Both ends at EGAT and ABCD are able to send receive the tripping signals mutually which in fact the digital tel
11. dance and advice he has provided throughout my time as his student I also would like to thank Mr Kosol Vigayatipat and Mr Srinon Chonganukulthanakorn from NYR Ltd Part accompanied by Mr Amnuay Tempiyapol from Thai Power Center Co Ltd for providing the information and supplying the equipment undertaken this research REFERENCES Chai Chompoo inwai Chitra Yingvivatanapong Pradit Fuangfoo and Wei Jen Lee Transmission Congestion Management During Transition Period of Electricity Deregulation in Thailand IEEE Trans Ind Appl vol 43 no 6 pp 1483 1490 Nov Dec 2007 Chow Chompoo inwai M Leelajindakrairerk S Banjongjit P Fuangfoo and Wei Jen Lee Biomass Power Generation Development in Thailand in IEEE Power amp Energy Society General Meeting 2009 Calgary AB 2009 pp 1 4 Chow Chompoo inwai Athiruk Aungkum Naradon Chotiwanaporn Siriwat Potivejjakul and Monthon Leelajindakrairerk A New Distributed Generation Protection Scheme in Thailand Using Direct Transfer Trip DTT Technique and a Mirrored Bit Protocol in The 20th International Conference on Electrical Engineering Jeju Korea 2014 pp 928 932 Emil Bartosiewicz et at Overview and Test Results of Modern Pilot Schemes for Coordination of Line Distance Protection Relays in 12th International Conference on Environment and Electrical Engineering EEEIC 2013 Wroclaw 2013 pp 191 196 DZ9 Teleprotection Application Technica
12. e connection between a RTU cabinet and two ends ABCD plant and PEA s SCADA Control Center Both are connected with real devices in the simulation process All IEC 61850 point lists are simulated by relay protection at ABCD power plant which inject voltage and current to the relay by a test tool OMICRON CMC 356 All the analog point lists AI are simulated by a test tool directly while the Digital Input point lists DI are simulated by the copper wires dry contact In the FAT test ABCD s DCS was simulated by RELAB OPC SERVER software to monitor I O point lists over IEC 61850 protocol while PEA s SCADA Control Center was simulated by ASE2000 software to monitor I O point lists via RTU and Gateway over PEA DNP3 protocol However the commissioning test was done at the actual locations for both ABCD s DCS and PEA s SCADA Control Center The test results for both FAT test and commissioning test of the newly installed SCADA system including Status Inputs Control Outputs and Analog Inputs points list are shown in Table 7 to Table 9 respectively Table 7 Test results of the Status Input points of SCADA system location Pass Fail Ce Te tee DCS_ Control Center 1YS 02 Closed Open Status Open Pass 1YG 01 Closed Open Status as S oO Pass Pass Pass 1YS 01 Control Set on Local F EE Ea l m l Pass oO gt oO als AE Pass J eS i A z
13. een both substations in this paper HUAHUAN H9MO fiber optic transmission equipment is used H9MO LMN4E1 SDH User s Manual for Fiber Optic Transmission Equipment 2007 EGAT PEA RAYONG 1 RAYONG 1 7052 1YB 01 C T H2167 21 ernt LAA G ree 115 kV E Infinite bus 342167 Pw 7012 sav MR a Zz gt gt 5 SAT 115 kV T ABCO LF di h LI I 1I G1 Gz 67 Ga Existing 92 MW New 27 MW Fig 3 Single line diagram of a DTT Technique with Carrier Signal Protection Scheme PTT and DEF The digital teleprotection unit receives DTT signal from a circuit breaker when circuit breaker 7022 at EGAT substation is in the Open status the DTT signal from EGAT will be sent to the digital teleprotection at ABCD power plant via FOM Two digital teleprotection units at ABCD power plant need to receive the same DTT signal before sending a trip signal to circuit breaker PW7012 at ABCD power plant Keep in mind that ABCD will not send out DTT signal to trip the circuit breaker at EGAT substation In contrary for the PTT and DEF teleprotection scheme both EGAT and ABCD are able to sending receiving the tripping signals between the two to trip the circuit breakers in both ends The existing PTT signaling scheme is now using the POTT scheme while the DEF is usingthe signal from directional earth fault overcurrent to generate the tripping signal to both ends of the teleprotecti
14. em Chai Chompoo inwai et al 2009 EGAT is responsible for purchasing electrical power from IPP and SPP while PEA is responsible for purchasing electrical power from SPP and VSPP whereas MEA is responsible for purchasing electrical power from SPP only Each utility has its own requirements and regulations about the electricity purchasing policy One of the key and common requirement is the teleprotection scheme of high voltage transmission line between the main power source EGAT MEA and PEA and the private sector power plant when synchronizing Almost all private sector in Thailand is able to connect to only one Utility while the SPP power plant can connect and sell the electricity to both EGAT and PEA Such an SPP must update its teleprotection scheme to comply with all connected grid network requirements and regulations Nowadays PEA s regulation for interconnection to PEA grid has two main requirements which are 1 PEA requires the IPP SPP contractor to install at least the simplest Direct Transfer Trip DTT teleprotection scheme for monitoring any of the circuit breaker status connected to PEA substation via PEA s fiber optic cable Chow Chompoo inwai et al 2014 and 2 the SPP contractor must meet up with the requirement to link up with PEA s Supervisory Control and Data Acquisition SCADA system It should be noted here that PEA s SCADA system is now operating over DNP3 protocol EGAT on the other hand has set its
15. eprotection scheme needs only one PTT signal OR signal logic DEF signaling scheme also applies similar methodology as PTT signaling scheme The key difference is that DEF signaling scheme relies on pilot tripping scheme of the directional overcurrent relay 67 instead And the picking up signal in directional earth fault overcurrent has been used to generate tripping signal Key to remote relay Tripping signal will be generating after the fulfillment of two same criteria as of the PTT scheme Both EGAT and SPP ABCD are also able to mutually send receive the tripping signal as in PTT scheme The single line diagram of DTT Technique with Carrier Signal Protection Scheme PTT and DEF is illustrated in Figure 3 In order to get such a protection scheme to work two extra teleprotection cabinets must be installed at both ends EGAT substation and ABCD power plant The communication between two ends has been done via PEA fiber optics network Each of the teleprotection cabinet comprises of two key components Two digital teleprotection units redundancy for sending receiving the DTT PTT and DEF signal between two substations The command logic of signals can be configured as AND OR as required in this paper the ISKRA DZ 9 teleprotection application is used DZ9 Teleprotection Application Description A Fiber optic to Multiplexer FOM for converting signal from digital teleprotection E1 G703 terminal to fiber optic cable betw
16. ipping commands on both ends rely on these two and the operator In the meantime ABCD would like to increase its generation capacity from 92 MW to 119 MW It is then required to meet EGAT S new protection scheme requirement with DTT technique and carrier signal protection scheme PTT and DEF PEA also now asks to have access to monitor and control the status of such protection scheme via PEAS supervisory control and data acquisition SCADA system This paper thoroughly elaborates the concept design and how to execute the implementation of the existing protection system and devices to meet both EGAT and PEA requirements Two teleprotection cabinets were added at both ends EGAT s bus and ABCD 5 bus in order to complete the interconnection between the two via PEA fiber optics network These two teleprotection cabinets play a significant role to fulfill EGATs DTT function with carrier signal protection scheme PTT and DEF requirement The in depth details of how to reconfiguration the existing system with this newly design scheme will be explained Another requirement to link up with PEAS SCADA system was done by adding another cabinet comprised of the gateway protocol converter between PEAS DNP3 protocol and internal ABCD IEC 61850 protocol remote terminal unit RTU and Ethernet switch at the ABCD 5 end The previously mentioned PEA fiber optic network has been used here via multiplexer MUX In order to validate that the newl
17. l Description v 1 13 Iskra d d Ljubljana H9MO LMN4E1 SDH Fiber Optic Transmission Equipment User 5 Manual v 1 2 Beijing Huahuan Electronics Co Beijing 2007 MiCOM P437 Distance Protection Device Technical Manual v 631 Schneider Electric Rueil Malmaison 2011 Line distance protection REL670 Technical reference manual v 1 2 ABB AB V ster s 2010 Christoph Brunner IEC 61850 for Power System Communication in T amp D IEEE PES Transmission and Distribution Conference and Exposition 2008 Chicago IL 2008 pp 1 6 R E Mackiewicz Overview of IEC 61850 and Benefits in JEEE PES Transmission and Distribution Conference and Exhibition 2005 2006 Dallas TX 2006 pp 376 383 Christoph Brunner The Impact of IEC 61850 on Protection in JET 9th International Conference on Developments in Power System Protection 2008 Glasgow 2008 pp 14 19 Reference Manual Rail Switch Power Lite RSPL v 2 0 Hirschmann Automation and Control Neckartenzlingen 2013 CaSE NX User Manual v 14 Remsdaq Limited Flintshire 2014 CMC356 Ref Manual v AE 7 OMICRON electronics Klaus 2013
18. neously right after the circuit breaker 7022 at EGAT opened The existing line protection system on the other hand needs to wait for a time delay which depends on the protection function setting of ABCD Table 5 and Table 6 present the test results of the new teleprotection functions PTT and DEF Carrier Signal Protection It is clear to be seen that the new teleprotection schemes with PTT and DEF have a much shorter operating time than the currently used protection This is mainly because the existing protection system needs to wait for a time delay which depends on the parameters setting of a relay protection while the new teleprotection functions can be operated instantaneously It is very clear here that the DTT with PTT and DEF Carrier Signal Protection scheme gives the system more stable and reliable Table 4 Test results of a DTT carrier signal protection scheme Fault Function EGAT s circuit breaker 7022 open when a fault occur A circuit breaker is not trip remain status Status of circuit breaker at ABCD PW7012 Traditional Protection DTT Carrier A circuit breaker is trip open status waiting time delay from Remark 8 y protection function Table 5 Test results of a PTT carrier signal protection scheme Fault Function Sub station Distance relay zone 1 Dist 2 ABCD i ance relay zone Distance relay zone 3 Distance relay zone 4 Distance relay zone 1 Dist I 2 EGAT ance relay zone
19. on units The MICOM P437 distance protection device is currently used in EGAT substation now MICOM P437 Technical Manual 2011 ABB REL670 transmission line distance protection device is now utilized in ABCD power plant Line distance protection REL670 Reference Manual 2010 In additional to the tripping signals all other alarming signals and communication statuses must be sent to both EGAT and ABCD Distributed Control System DCS in real time mode Such a scheme of teleprotection and communication between EGAT RY1 and ABCD power plant is illustrated in Figure 4 me e e e a a a a a a a a a a a ee ae ee ee 5 r ABCD power plant 1 EGAT RAYONG1 substation i MICOM P437 ABB REL670 Distance Protection Line distance protection i i Device JER RE nce ase rere l AE era ad a i Fiber optic i E L es ee EiS LDL crR CRR 1 D1 4 4 I bua aie l ITeleprotection cabinet 1 I Teleprotection cabinet 2 IEC61850 IEC60870 5 103 I l l l l o I o l J i J l l l l l l l r X I l 1 l I j i j i l I I I j l 1 l i 1 1 L ABCD s Power Plant DCS EGAT s DCS Fig 4 Scheme of teleprotection amp communication between EGAT RY1 substation and ABCD power plant 4 SCADA SYSTEM FOR MONITORING AND CONTROL OF ABCD POWER PLANT USING IEC61850
20. own new regulation for interconnection to any of EGAT grid The IPP SPP contractors must install or update their teleprotection schemes according to EGAT s new regulation which requires at least the following capabilities e Direct Transfer Trip scheme DTT e Permissive Transfer Trip scheme PTT e Directional Earth Fault Transfer Trip scheme DEF EGAT also require the IPP SPP contractor to link up with EGAT s SCADA system for remote control and monitoring the main equipment status in IPP SPP power plant over IEC 60870 5 103 protocol This paper mainly focuses on a very interesting case study here The scenario is that there is one natural gas type SPP power plant namely ABCD This SPP has a very unique and interesting manner ABCD usually earns its revenue from selling the electricity to PEA via 115 kV EGAT s substation however this action has been done over PEA s transmission line A very simple existing teleprotection scheme as shown in Fig l has been used for years more details in the next section An issue now starts when ABCD want to increase its generation capacity from 92 MW to 119 MW It is then a must to meet EGAT s new teleprotection scheme requirements for DTT with carrier signal protection scheme PTT and DEF PEA also now asks to have access to monitor and control the real time status of such a protection scheme via PEA s SCADA system As a result this research paper presents the solution for this case
21. st Set and Commissioning Tool is used for this purpose CMC 356 Reference Manual The DTT signal is simulated by copper wires via Digital Input Output DI DO of teleprotection cabinets Finally the operating time of all signals are measured by this test tool Omicron CMC356 Voltage amp Current Voltage amp Current Time trip signal Time trip signal i i por cRs t r lt CRS p0 gt j i MICOM P437 ABB REL670 Bye pt a EGAT RY1 7022 ABCD PW7012 Zonet 80 Instantaneous Trip Zone2 120 Permissive Zone Zone3 10 Time Delay Trip Zone4 150 Time Delay Trip System Backup Zonet 80 Instantaneous Trip Zone2 120 Permissive Zone Zone3 150 Time Delay Trip System Backup CRS Send Carrier Signal Protection DI Digital Input CRR Receive Carrier Signal Protection DO Digital Output Fig 6 System configuration of the teleprotection cabinets FAT test The tested results for both FAT test and commissioning test of the teleprotection functions i e DTT PTT and DEF comparing to the existing traditional protection scheme are shown in Table 4 to Table 6 respectively Table 4 illustrates the test results of the proposed DTT carrier signal protection scheme when a fault occurred and it caused EGAT circuit breaker 7022 to operate and in the Open status It was found that the circuit breaker at ABCD PW7012 tripped simulta
22. study in terms of the design concept and implementation including the commissioning test results This special protection scheme is then called Direct Transfer Trip DTT technique with Carrier Signal Protection Scheme PTT and DEF and SCADA system for monitoring amp control communicated by IEC61850 and DNP3 protocol between ABCD and two utilities 2 EXISTING CONNECTION AND TELEPROTECTION SCHEME BETWEEN ABCD POWER PLANT AND TWO UTILITIES ABCD is the petrochemical industrial company located in the eastern part of Thailand ABCD has been selling the electricity to PEA via EGAT substation since 2001 The existing connection scheme between ABCD power plant and two utilities is illustrated in Figure 1 The overall system consists of seven units of natural gas type generators G1 G7 which has a total generation capacity of 92MW ABCD connects to EGAT s 115kV substation namely RAYONGI EGAT RY1 and then connects to PEA substation also namely RAYONGI PEA RY1 via PEA s transmission line The currently used protection scheme for this scenario is that there are only two relays distance relay 21 and directional relay 67 connected at EGAT s infinite bus and ABCD ends without any teleprotection scheme EGAT PEA RAYONG 1 RAYONG 1 7052 1YB 01 tan 2067 21 any 3 z G 7022 Infinite bus z 115 kV 3HE _ Pw 7012 115 KV T CH sh 115 kV ABCD d ak d BCD o oO G1 G2 67 Gs Existing
23. y improved protection scheme is able to work properly both factory acceptance test FAT and the commissioning test after implementation are mandatory This paper also explains the steps and process on how to do FAT and commissioning test The test results and analysis are also presented here in this paper The concept design the implementation results and the test results from this particular case study can be used as a very good example for the similar circumstance in Thailand Keywords Direct Transfer Trip DTT Carrier Signal Protection Permissive Transfer Trip PTT Directional Earth Fault Transfer Trip DEF DNP3 0 protocol EC 61850 protocol 1 INTRODUCTION In Thailand the electrical power system has been managed by three state utilities 1 e the Electricity Generating Authority of Thailand EGAT the Metropolitan Electricity Authority MEA and the Provincial Electricity Authority PEA EGAT is responsible for operating the generation and the transmission systems while MEA and PEA are responsible for distribution system in metropolitan and other local areas respectively According to the Power Development Plan PDP 2012 during the year 2012 2025 Thailand government plans to purchase more electrical power from the private sector 1 e Independent Power Producer IPP Small Power Producer SPP and Very Small Power Producer VSPP to enhance the stability and reliability of Thailand s electrical power syst
24. ype 01YS 01 Closed Open Status O1YS 02 Closed Open Status 01YS 03 Closed Open Status___ Undefine Closed Open Fault No Equipment 01YG 01 Closed Open Status 6 _ 01YB 01 Control Set on OLYS 01 Control Set on 8 Sync Switch Selection __ Undefine _Auto Manual Fault No Equipment 9 SOBFRelay Status Undefine On Off Fault Not use function O1YS 02 Control Set on Undefine Local Remote Fault No Equipment__ DTT Inter Trip Cut Off Status 2 Distance Relay Phase A Normal Trip IBC61850___ SOE Distance Relay PhaseB_ Normal Trip mc6isso sor Distance Relay PhaseC Normal Trip mc6isso sor Distance Relay Earth Fault Normal Trip EC6i850 __ SOE Distance Relay Trip Normal Trip EC6i8s0 _ soE RIGIRISIBIZISISISISIZIBIZISIBIZISLSIQINIRESIRIBISISISISIZIDIRIGIEIS HAIN WIN Re CO jelo Alun AI Iun Nie oel aD aNs IOLOLOINIAITNn amp oo Distance Relay Zone1 Normal Trip IBC61850____ SOE Normal Trip tsco18so___ SOE Normal Normal ip tEC618s0___ SOE ip TEC6i8s0__ SOE ail Copperwires DI i mc isso DI IEC61850 SOE SO SO Z Distance Relay DC Supply ormal Distance Relay VT Suppl ormal Directional Overcurrent Phase A Normal N W Directional Overcurrent Phase B Normal Directional Overcurrent Phase C Normal Directional Earth Fault Normal
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ICEE15A 462