cover sheetTCE CONSULTING ENGINEERS LIMITED30421007-3OQ-00002-P0CSHEET 1 OF 1I/O LIST FOR SEQUENCE OF EVENTS RECORDERSAUDI ELECTRICITY COMPANYEASTERN OPERATING AREADammam, Saudi ArabiaGENERATION EXPANSION OF ARAR POWER PLANT(CONTRACT NO : 30421007/00)I/O LIST FOR SEQUENCE OF EVENTS RECORDERDOCUMENT NO : 30421007-3OQ-00002-P0CMAY 2005ENGINEERING CONSULTANTTCE CONSULTING ENGINEERS LIMITED73/1, ST.MARK'S ROADBANGALORE 560001INDIACONTRACTOR:AL-TOUKHI COMPANY FOR INDUSTRY & TRADINGP.O.BOX 497, RIYADH 11411, KINGDOM OF SAUDI ARABIATEL.00966-1-4633660 : FAX.00966-1-4631150P0C 19-05-05AESRREV NO. DATEPREPARED BYCHECKED BYCLEARED BYAPPROVED BY

&C&L&FSECTION :&A&RSHEET &P OF &N

Arar Power PlantSL.No.Alarm Code.Tag No.List of Digital Signals for SOERRemarksA.GTG-7As per GE's dwg no.GR0976-207D3312181OOver Frequency alarm -G60A281OOver Frequency alarm- G60B324Volts/Hertz Alarm-G60A424Volts/Hertz Alarm -G60B527PUnder voltage Alarm-G60A627PUnder voltage Alarm-G60B732-1Reverse power Trip -G60A832-2Reverse power Trip -G60B940-1,2Loss of excitation Trip -G60A1040-1,2Loss of excitation Trip -G60B1146Generator unbalance(Negative sequence) trip G60A1246Generator unbalance(Negative sequence) trip G60B1351PVVoltage Restrained Overcurrent-Trip -G60A1451PVVoltage Restrained Overcurrent-Trip -G60B1559POver voltage Alarm-G60A1659POver voltage Alarm-G60B1781 UUnder frequency Trip-G60A1881 UUnder frequency Trip-G60B1987SStator Differential Trip-G60A2087SStator Differential Trip-G60B2127TN3rd Harmoic Neutral Undervoltage Trip-G60A2227TN3rd Harmoic Neutral Undervoltage Trip-G60B2350/27Inadvertance energization Trip-G60A2450/27Inadvertance energization Trip -G60B2521Phase Distance Trip-G60A2621Phase Distance Trip-G60B2778Out of step Trip-G60A2878Out of step Trip-G60B2959NOver voltage Neutral Trip-G60A3059NOver voltage Neutral Trip-G60B31VTFFVoltage transformer fuse failure Alarm-G60A32VTFFVoltage transformer fuse failure Alarm-G60B33Critical FailureG60A fail Alarm34Critical FailureG60B fail Alarm86G-1ALock out relay 86G-1A operated86G-2ALock out relay 86G-2A operated86G-1BLock out relay 86G-1B operated86G-2BLock out relay 86G-2B operated86IELock out relay 86IE operated86ULock out relay 86U operated86BFLock out relay 86BF operatedB.Generator Circuit Breaker Unit-735Breaker Status3674/TC-1CB Trip coil -1 supervision operated3774/TC-2CB Trip coil -2 supervision operated38CB Operating Mechanism failed3994GB1Generator breaker alarm (grouped alarm)4094GB2Generator breaker fault (grouped fault)C.GTG-8As per GE's dwg no.GR0976-207D33124181OOver Frequency alarm -G60A4281OOver Frequency alarm- G60B4324Volts/Hertz Alarm-G60A4424Volts/Hertz Alarm -G60B4527PUnder voltage Alarm-G60A4627PUnder voltage Alarm-G60B4732-1Reverse power Trip -G60A4832-2Reverse power Trip -G60B4940-1,2Loss of excitation Trip -G60A5040-1,2Loss of excitation Trip -G60B5146Generator unbalance(Negative sequence) trip G60A5246Generator unbalance(Negative sequence) trip G60B5351PVVoltage Restrained Overcurrent-Trip -G60A5451PVVoltage Restrained Overcurrent-Trip -G60B5559POver voltage Alarm-G60A5659POver voltage Alarm-G60B5781 UUnder frequency Trip-G60A5881 UUnder frequency Trip-G60B5987SStator Differential Trip-G60A6087SStator Differential Trip-G60B6127TN3rd Harmoic Neutral Undervoltage Trip-G60A6227TN3rd Harmoic Neutral Undervoltage Trip-G60B6350/27Inadvertance energization Trip-G60A6450/27Inadvertance energization Trip -G60B6521Phase Distance Trip-G60A6621Phase Distance Trip-G60B6778Out of step Trip-G60A6878Out of step Trip-G60B6959NOver voltage Neutral Trip-G60A7059NOver voltage Neutral Trip-G60B71VTFFVoltage transformer fuse failure Alarm-G60A72VTFFVoltage transformer fuse failure Alarm-G60B73Critical FailureG60A fail Alarm74Critical FailureG60B fail Alarm86G-1ALock out relay 86G-1A operated86G-2ALock out relay 86G-2A operated86G-1BLock out relay 86G-1B operated86G-2BLock out relay 86G-2B operated86IELock out relay 86IE operated86ULock out relay 86U operated86BFLock out relay 86BF operatedD.Generator Circuit Breaker Unit-875Breaker Status7674/TC-1CB Trip coil -1 supervision operated7774/TC-2CB Trip coil -2 supervision operated78CB Operating Mechanism failed7994GB1Generator breaker alarm (grouped alarm)8094GB2Generator breaker fault (grouped fault)E.Future GTG8181OOver Frequency alarm -G60A8281OOver Frequency alarm- G60B8324Volts/Hertz Alarm-G60A8424Volts/Hertz Alarm -G60B8527PUnder voltage Alarm-G60A8627PUnder voltage Alarm-G60B8732-1Reverse power Trip -G60A8832-2Reverse power Trip -G60B8940-1,2Loss of excitation Trip -G60A9040-1,2Loss of excitation Trip -G60B9146Generator unbalance(Negative sequence) trip G60A9246Generator unbalance(Negative sequence) trip G60B9351PVVoltage Restrained Overcurrent-Trip -G60A9451PVVoltage Restrained Overcurrent-Trip -G60B9559POver voltage Alarm-G60A9659POver voltage Alarm-G60B9781 UUnder frequency Trip-G60A9881 UUnder frequency Trip-G60B9987SStator Differential Trip-G60A10087SStator Differential Trip-G60B10127TN3rd Harmoic Neutral Undervoltage Trip-G60A10227TN3rd Harmoic Neutral Undervoltage Trip-G60B10350/27Inadvertance energization Trip-G60A10450/27Inadvertance energization Trip -G60B10521Phase Distance Trip-G60A10621Phase Distance Trip-G60B10778Out of step Trip-G60A10878Out of step Trip-G60B10959NOver voltage Neutral Trip-G60A11059NOver voltage Neutral Trip-G60B111VTFFVoltage transformer fuse failure Alarm-G60A112VTFFVoltage transformer fuse failure Alarm-G60B113Critical FailureG60A fail Alarm114Critical FailureG60B fail Alarm86G-1ALock out relay 86G-1A operated86G-2ALock out relay 86G-2A operated86G-1BLock out relay 86G-1B operated86G-2BLock out relay 86G-2B operated86IELock out relay 86IE operated86ULock out relay 86U operated86BFLock out relay 86BF operatedF.Generator Circuit Breaker Future Unit115Breaker Status11674/TC-1CB Trip coil -1 supervision operated11774/TC-2CB Trip coil -2 supervision operated118CB Operating Mechanism failed11994GB1Generator breaker alarm (grouped alarm)12094GB2Generator breaker fault (grouped fault)G.Generator Transformer of Unit-712163-1 GTT607 Buchholz relay alarm operated12263-2 GTT607 Buchholz relay Trip operated12363-1 OLTCOLTC of T607 Buchholz relay alarm operated12463-2 OLTCOLTC of T607 Buchholz relay Trip operated12549-1 OGTT607 Oil temperature high - Alarm12649-2 OGTT607 Oil temperature very high - Trip12749-1 WGTT607 Winding Temperature high - Alarm12849-2 WGTT607 Winding Temperature very high - Trip12971 GTT607 Low Oil Level - Trip13063 PRGTT607 Pressure Relief Device operated - Trip13187 GTT607 87GT Differential protection PH-A operated13287 GTT607 87GT Differential protection PH-B operated13387 GTT607 87GT Differential protection PH-C operated13487 GTGT607 Restricted Ground Differential protection operated13551N GGTT607 Ground Over Current backup protection operated13687 OAT607 Overall Unit Differential Protection PH-A operated13787 OAT607 Overall Unit Differential Protection PH-B operated13887 OAT607 Overall Unit Differential Protection PH-C operated13987 GT FDRT607 132kV side Feeder Differential protection PH-A operated14087 GT FDRT607132kV side Feeder Differential protection PH-B operated14187 GT FDRT607 132kV side Feeder Differential protection PH-C operated14286 GT-1Gen.Transformer T607 Lockout relay-1 operated14374/86Gen.Transformer T607 Lockout relay-1 supervision relay operated14486 GT-2Gen.Transformer T607 Lockout relay-2 operated14574/86Gen.Transformer T607 Lockout relay-2 supervision relay operated14651 GTT607 phase fault back up over current protection PH-A operated14751 GTT607 phase fault back up over current protection PH-B operated14851 GTT607 phase fault back up over current protection PH-C operated14927T607 Tap changer device fail alarm150OLTC pressure relief device operated151OLTC protection relay operated152OLTC Low oil level alarm153Transformer membrane failure alarm154Cooling system failed alarm155Transformer low oil level alarm156Maintenance switch open15774DCDC circuit supervision relay (74DC)in the ckt of 86-115874DCDC circuit supervision relay (74DC)in the ckt of 86-2159Primary protection SOE common +ve open160Backup protection SOE common +ve open161Mechanical protection SOE common +ve open16286-1 Trip opened at FT16386-2 Trip opened at FT16486-3 Trip opened at FT16587GTRelay 87GT faulty16650/51Relay 50/51 GT faulty16787OAOverall differential relay 87OA faulty16887 GT FDRFeeder differential relay 87GT FDR faultyH.132kV Circuit Breaker Unit-7169Breaker Status17074/TC-1CB Trip coil -1 supervision operated17174/TC-2CB Trip coil -2 supervision operated172CB Operating Mechanism failed173SF6 Gas pressure low174Breaker failure relay operated175Breaker failure lockout relay operated176BF relay Circuit DC differential supervision relay operatedE.Generator Transformer of Unit-817763-1 GTT608 Buchholz relay alarm operated17863-2 GTT608 Buchholz relay Trip operated17963-1 OLTCOLTC of T608 Buchholz relay alarm operated18063-2 OLTCOLTC of T608 Buchholz relay Trip operated18149-1 OGTT608 Oil temperature high - Alarm18249-2 OGTT608 Oil temperature very high - Trip18349-1 WGTT608 Winding Temperature high - Alarm18449-2 WGTT608 Winding Temperature very high - Trip18571 GTT608 Low Oil Level - Trip18663 PRGTT608 Pressure Relief Device operated - Trip187COOLER FAILURET608 Cooling System failed - Trip18887 GTT608 87GT Differential protection PH-A operated18987 GTT608 87GT Differential protection PH-B operated19087 GTT608 87GT Differential protection PH-C operated19187 GTGT608 Restricted Ground Differential protection operated19251N GGTT608 Ground Over Current backup protection operated19387 OAT608 Overall Unit Differential Protection PH-A operated19487 OAT608 Overall Unit Differential Protection PH-B operated19587 OAT608 Overall Unit Differential Protection PH-C operated19687 GT FDRT608 132kV side Feeder Differential protection PH-A operated19787 GT FDRT608132kV side Feeder Differential protection PH-B operated19887 GT FDRT608 132kV side Feeder Differential protection PH-C operated19986 GT-1Gen.Transformer T608 Lockout relay-1 operated20074/86Gen.Transformer T608 Lockout relay-1 supervision relay operated20186 GT-2Gen.Transformer T608 Lockout relay-2 operated20274/86Gen.Transformer T608 Lockout relay-2 supervision relay operated20351 GTT608 phase fault back up over current protection PH-A operated20451 GTT608 phase fault back up over current protection PH-B operated20551 GTT608 phase fault back up over current protection PH-C operated20627T608 Tap changer device fail alarm207OLTC pressure relief device operated208OLTC protection relay operated209OLTC Low oil level alarm210Transformer membrane failure alarm211Cooling system failed alarm212Transformer low oil level alarm213Maintenance switch open21474DCDC circuit supervision relay (74DC)in the ckt of 86-121574DCDC circuit supervision relay (74DC)in the ckt of 86-2216Primary protection SOE common +ve open217Backup protection SOE common +ve open218Mechanical protection SOE common +ve open21986-1 Trip opened at FT22086-2 Trip opened at FT22186-3 Trip opened at FT22287GTRelay 87GT faulty22350/51Relay 50/51 GT faulty22487OAOverall differential relay 87OA faulty22587 GT FDRFeeder differential relay 87GT FDR faultyH.132kV Circuit Breaker Unit-8226Breaker Status22774/TC-1CB Trip coil -1 supervision operated22874/TC-2CB Trip coil -2 supervision operated229CB Operating Mechanism failed230SF6 Gas pressure low231Breaker failure relay operated232Breaker failure lockout relay operated233BF relay Circuit DC differential supervision relay operatedFGenerator Transformer of Unit-523463-1 GTT605 Buchholz relay alarm operated23563-2 GTT605 Buchholz relay Trip operated23663-1 OLTCOLTC of T605 Buchholz relay alarm operated23763-2 OLTCOLTC of T605 Buchholz relay Trip operated23849-1 OGTT605 Oil temperature high - Alarm23949-2 OGTT605 Oil temperature very high - Trip24049-1 WGTT605 Winding Temperature high - Alarm24149-2 WGTT605 Winding Temperature very high - Trip24271 GTT605 Low Oil Level - Trip24363 PRGTT605 Pressure Relief Device operated - Trip244COOLER FAILURET605 Cooling System failed - Trip24587 GTT605 87GT Differential protection PH-A operated24687 GTT605 87GT Differential protection PH-B operated24787 GTT605 87GT Differential protection PH-C operated24887 GTGT605 Restricted Ground Differential protection operated24951N GGTT605 Ground Over Current backup protection operated25087 OAT605 Overall Unit Differential Protection PH-A operated25187 OAT605 Overall Unit Differential Protection PH-B operated25287 OAT605 Overall Unit Differential Protection PH-C operated25387 GT FDRT605 132kV side Feeder Differential protection PH-A operated25487 GT FDRT605132kV side Feeder Differential protection PH-B operated25587 GT FDRT605 132kV side Feeder Differential protection PH-C operated25686 GT-1Gen.Transformer T605 Lockout relay-1 operated25774/86Gen.Transformer T605 Lockout relay-1 supervision relay operated25886 GT-2Gen.Transformer T605 Lockout relay-2 operated25974/86Gen.Transformer T605 Lockout relay-2 supervision relay operated26051 GTT605 phase fault back up over current protection PH-A operated26151 GTT605 phase fault back up over current protection PH-B operated26251 GTT605 phase fault back up over current protection PH-C operated26327T605 Tap changer device fail alarm264OLTC pressure relief device operated265OLTC protection relay operated266OLTC Low oil level alarm267Transformer membrane failure alarm268Cooling system failed alarm269Transformer low oil level alarm270Maintenance switch open27174DCDC circuit supervision relay (74DC)in the ckt of 86-127274DCDC circuit supervision relay (74DC)in the ckt of 86-2273Primary protection SOE common +ve open274Backup protection SOE common +ve open275Mechanical protection SOE common +ve open27686-1 Trip opened at FT27786-2 Trip opened at FT27886-3 Trip opened at FT27987GTRelay 87GT faulty28050/51Relay 50/51 GT faulty28187OAOverall differential relay 87OA faulty28287 GT FDRFeeder differential relay 87GT FDR faultyH.132kV Circuit Breaker Unit-5283Breaker Status28474/TC-1CB Trip coil -1 supervision operated28574/TC-2CB Trip coil -2 supervision operated286CB Operating Mechanism failed287SF6 Gas pressure low288Breaker failure relay operated289Breaker failure lockout relay operated290BF relay Circuit DC differential supervision relay operatedGGenerator Transformer of Unit-629163-1 GTT606 Buchholz relay alarm operated29263-2 GTT606 Buchholz relay Trip operated29363-1 OLTCOLTC of T606 Buchholz relay alarm operated29463-2 OLTCOLTC of T606 Buchholz relay Trip operated29549-1 OGTT606 Oil temperature high - Alarm29649-2 OGTT606 Oil temperature very high - Trip29749-1 WGTT606 Winding Temperature high - Alarm29849-2 WGTT606 Winding Temperature very high - Trip29971 GTT606 Low Oil Level - Trip30063 PRGTT606 Pressure Relief Device operated - Trip301COOLER FAILURET606 Cooling System failed - Trip30287 GTT606 87GT Differential protection PH-A operated30387 GTT606 87GT Differential protection PH-B operated30487 GTT606 87GT Differential protection PH-C operated30587 GTGT606 Restricted Ground Differential protection operated30651N GGTT606 Ground Over Current backup protection operated30787 OAT606 Overall Unit Differential Protection PH-A operated30887 OAT606 Overall Unit Differential Protection PH-B operated30987 OAT606 Overall Unit Differential Protection PH-C operated31087 GT FDRT606 132kV side Feeder Differential protection PH-A operated31187 GT FDRT606132kV side Feeder Differential protection PH-B operated31287 GT FDRT606 132kV side Feeder Differential protection PH-C operated31386 GT-1Gen.Transformer T606 Lockout relay-1 operated31474/86Gen.Transformer T606 Lockout relay-1 supervision relay operated31586 GT-2Gen.Transformer T606 Lockout relay-2 operated31674/86Gen.Transformer T606 Lockout relay-2 supervision relay operated31751 GTT606 phase fault back up over current protection PH-A operated31851 GTT606 phase fault back up over current protection PH-B operated31951 GTT606 phase fault back up over current protection PH-C operated32027T606 Tap changer device fail alarm321OLTC pressure relief device operated322OLTC protection relay operated323OLTC Low oil level alarm324Transformer membrane failure alarm325Cooling system failed alarm326Transformer low oil level alarm327Maintenance switch open32874DCDC circuit supervision relay (74DC)in the ckt of 86-132974DCDC circuit supervision relay (74DC)in the ckt of 86-2330Primary protection SOE common +ve open331Backup protection SOE common +ve open332Mechanical protection SOE common +ve open33386-1 Trip opened at FT33486-2 Trip opened at FT33586-3 Trip opened at FT33687GTRelay 87GT faulty33750/51Relay 50/51 GT faulty33887OAOverall differential relay 87OA faulty33987 GT FDRFeeder differential relay 87GT FDR faultyH.132kV Circuit Breaker Unit-6340Breaker Status34174/TC-1CB Trip coil -1 supervision operated34274/TC-2CB Trip coil -2 supervision operated343CB Operating Mechanism failed344SF6 Gas pressure low345Breaker failure relay operated346Breaker failure lockout relay operated347BF relay Circuit DC differential supervision relay operatedHGenerator Transformer of Future Unit32163-1 GTT609 Buchholz relay alarm operated32263-2 GTT609 Buchholz relay Trip operated32363-1 OLTCOLTC of T609 Buchholz relay alarm operated32463-2 OLTCOLTC of T609 Buchholz relay Trip operated32549-1 OGTT609 Oil temperature high - Alarm32649-2 OGTT609 Oil temperature very high - Trip32749-1 WGTT609 Winding Temperature high - Alarm32849-2 WGTT609 Winding Temperature very high - Trip32971 GTT609 Low Oil Level - Trip33063 PRGTT609 Pressure Relief Device operated - Trip331COOLER FAILURET609 Cooling System failed - Trip33287 GTT609 87GT Differential protection PH-A operated33387 GTT609 87GT Differential protection PH-B operated33487 GTT609 87GT Differential protection PH-C operated33587 GTGT609 Restricted Ground Differential protection operated33651N GGTT609 Ground Over Current backup protection operated33787 OAT609 Overall Unit Differential Protection PH-A operated33887 OAT609 Overall Unit Differential Protection PH-B operated33987 OAT609 Overall Unit Differential Protection PH-C operated34087 GT FDRT609 132kV side Feeder Differential protection PH-A operated34187 GT FDRT609132kV side Feeder Differential protection PH-B operated34287 GT FDRT609 132kV side Feeder Differential protection PH-C operated34386 GT-1Gen.Transformer T609 Lockout relay-1 operated34474/86Gen.Transformer T609 Lockout relay-1 supervision relay operated34586 GT-2Gen.Transformer T609 Lockout relay-2 operated34674/86Gen.Transformer T609 Lockout relay-2 supervision relay operated34751 GTT609 phase fault back up over current protection PH-A operated34851 GTT609 phase fault back up over current protection PH-B operated34951 GTT609 phase fault back up over current protection PH-C operated35027T609 Tap changer device fail alarm351OLTC pressure relief device operated352OLTC protection relay operated353OLTC Low oil level alarm354Transformer membrane failure alarm355Cooling system failed alarm356Transformer low oil level alarm357Maintenance switch open35874DCDC circuit supervision relay (74DC)in the ckt of 86-135974DCDC circuit supervision relay (74DC)in the ckt of 86-2360Primary protection SOE common +ve open361Backup protection SOE common +ve open362Mechanical protection SOE common +ve open36386-1 Trip opened at FT36486-2 Trip opened at FT36586-3 Trip opened at FT36687GTRelay 87GT faulty36750/51Relay 50/51 GT faulty36887OAOverall differential relay 87OA faulty36987 GT FDRFeeder differential relay 87GT FDR faultyH.132kV Circuit Breaker Future Unit-6370Breaker Status37174/TC-1CB Trip coil -1 supervision operated37274/TC-2CB Trip coil -2 supervision operated373CB Operating Mechanism failed374SF6 Gas pressure low375Breaker failure relay operated376Breaker failure lockout relay operated377BF relay Circuit DC differential supervision relay operatedIUnit Auxiliary Transformer UAT 30737849-1WUATUnit Auxiliary Transformer Winding Temperature high - Alarm37949-2WUATUnit Auxiliary Transformer Winding Temperature very high -Trip38051G UATUnit Auxiliary Transformer Ground Over Current protection operated38151G UATUnit Auxiliary Transformer Ground Over Current relay faulty38250/51 UATUnit Auxiliary Transformer HV Side over current protection Phase -A operated38350/51 UATUnit Auxiliary Transformer HV Side over current protection Phase -B operated38450/51 UATUnit Auxiliary Transformer HV Side over current protection Phase -C operated38550/51 UATUnit Auxiliary Transformer HV Side over current relay faulty38650/51Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection Phase-A operated38750/51Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection Phase-B operated38850/51Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection Phase-C operated38951NUnit Auxiliary Transformer LV side Inverse Ground fault protection operated39050/51NUnit Auxiliary Transformer LV side O/C, E/F relay faulty39186-A201Unit Auxiliary Transformer Breaker Lockout relay operated39274/86Unit Auxiliary Transformer Breaker Lockout relay supervision relay operated39374/DCUnit Auxiliary Transformer Breaker DC Supply Failure relay operated39486-UATUnit Auxiliary Transformer Lockout relay operated39574/86/UATUnit Auxiliary Transformer Lockout relay supervision relay operatedJUnit Auxiliary Transformer UAT 307 LV side Breaker(A201)39674/TCUnit Auxiliary Transformer Breaker Trip Coil Supervision relay operated397Unit Auxiliary Transformer Breaker Status398Unit Auxiliary Transformer Breaker Operating Mechanism failedJUnit Auxiliary Transformer UAT 30839949-1WUATUnit Auxiliary Transformer Winding Temperature high - Alarm40049-2WUATUnit Auxiliary Transformer Winding Temperature very high -Trip40151G UATUnit Auxiliary Transformer Ground Over Current protection operated40251G UATUnit Auxiliary Transformer Ground Over Current relay faulty40350/51 UATUnit Auxiliary Transformer HV Side over current protection Phase -A operated40450/51 UATUnit Auxiliary Transformer HV Side over current protection Phase -B operated40550/51 UATUnit Auxiliary Transformer HV Side over current protection Phase -C operated40650/51 UATUnit Auxiliary Transformer HV Side over current relay faulty40750/51Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection Phase-A operated40850/51Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection Phase-B operated40950/51Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection Phase-C operated41051NUnit Auxiliary Transformer LV side Inverse Ground fault protection operated41150/51NUnit Auxiliary Transformer LV side O/C, E/F relay faulty41286Unit Auxiliary Transformer Breaker Lockout relay operated41374/86Unit Auxiliary Transformer Breaker Lockout relay supervision relay operated41474/DCUnit Auxiliary Transformer Breaker DC Supply Failure relay operated41586-UATUnit Auxiliary Transformer Lockout relay operated41674/86/UATUnit Auxiliary Transformer Lockout relay supervision relay operatedJUnit Auxiliary Transformer UAT 308 LV side Breaker(A201)41774/TCUnit Auxiliary Transformer Breaker Trip Coil Supervision relay operated418Unit Auxiliary Transformer Breaker Status419Unit Auxiliary Transformer Breaker Operating Mechanism failedKUnit Auxiliary Transformer (Future Unit)42049-1WUATUnit Auxiliary Transformer Winding Temperature high - Alarm42149-2WUATUnit Auxiliary Transformer Winding Temperature very high -Trip42251G UATUnit Auxiliary Transformer Ground Over Current protection operated42351G UATUnit Auxiliary Transformer Ground Over Current relay faulty42450/51 UATUnit Auxiliary Transformer HV Side over current protection Phase -A operated42550/51 UATUnit Auxiliary Transformer HV Side over current protection Phase -B operated42650/51 UATUnit Auxiliary Transformer HV Side over current protection Phase -C operated42750/51 UATUnit Auxiliary Transformer HV Side over current relay faulty42850/51Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection Phase-A operated42950/51Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection Phase-B operated43050/51Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection Phase-C operated43151NUnit Auxiliary Transformer LV side Inverse Ground fault protection operated43250/51NUnit Auxiliary Transformer LV side O/C, E/F relay faulty43386Unit Auxiliary Transformer Breaker Lockout relay operated43474/86Unit Auxiliary Transformer Breaker Lockout relay supervision relay operated43574/DCUnit Auxiliary Transformer Breaker DC Supply Failure relay operated43686-UATUnit Auxiliary Transformer Lockout relay operated43774/86/UATUnit Auxiliary Transformer Lockout relay supervision relay operatedJUnit Auxiliary Transformer -Future LV side Breaker(A201)43874/TCUnit Auxiliary Transformer Breaker Trip Coil Supervision relay operated439Unit Auxiliary Transformer Breaker Status440Unit Auxiliary Transformer Breaker Operating Mechanism failedLStation Auxiliary Transformer SAT T20144163-1 SATStation Aux.Transformer T201 Buchholz relay alarm operated44263-2 SATStation Aux.Transformer T201 Buchholz relay Trip operated44349-1 OSATStation Aux.Transformer T201 Oil temperature high - Alarm44449-2 OSATStation Aux.Transformer T201 Oil temperature very high - Trip44549-1 WSATStation Aux.Transformer T201 Winding Temperature high - Alarm44649-2 WSATStation Aux.Transformer T201 Winding Temperature very high - Trip44771 SATStation Aux.Transformer T201 Low Oil Level - Alarm44863 P SATStation Aux.Transformer T201 Pressure Relief Device operated - Trip44963 OLTCStation Aux.Transformer T201 OLTC Buchholz trip45027Station Aux. Transformer T201 Tap changer device failure alarm45151G LVStation Aux.Transformer T201 Neutral Ground Fault protection operated45251G LVStation Aux.Transformer T201 Neutral Ground Fault relay faulty45350/51Station Aux.Transformer T201 HV BKR INST/ Inverse Time O/C Phase-A operated45450/51Station Aux.Transformer T201 HV BKR INST/ Inverse Time O/C Phase-B operated45550/51Station Aux.Transformer T201 HV BKR INST/ Inverse Time O/C Phase-C operated45650N/51NStation Aux.Transformer T201 HV BKR INST/ Inverse Time Ground fault protection operated45750/51NStation Aux.Transformer T201 HV BKR INST/ Inverse Time O/C, E/F relay faulty.45850GStation Aux.Transformer T201 HV BKR CBCT protection operated45986 B212Station Aux.Transformer T201 HV BKR lockout relay operated46074/86Station Aux.Transformer T201 HV BKR Lockout relay supervision relay operated46186 A101Station Aux.Transformer T201 LV BKR Lockout relay operated46274/86Station Aux.Transformer T201 LV BKR Lockout relay supervision relay operated46374 TCStation Aux.Transformer T201 LV BKR Trip coil supervision relay operated46474 DCStation Aux.Transformer T201 LV BKR DC supply supervision relay operated46551Station Aux.Transformer T201 LV BKR inverse time O/C Phase -A operated46651Station Aux.Transformer T201 LV BKR inverse time O/C Phase -B operated46751Station Aux.Transformer T201 LV BKR inverse time O/C Phase -C operated46851NStation Aux.Transformer T201 LV BKR inverse time earthfault relay operated46951/51NStation Aux.Transformer T201 LV BKR inverse time O/C, E/F relay faulty470OLTC pressure relief device operated471OLTC protection relay operated472OLTC Low oil level alarm473Transformer membrane failure alarm474Maintenance switch openMStation Auxiliary Transformer SAT T20247563-1 SATStation Aux.Transformer T202 Buchholz relay alarm operated47663-2 SATStation Aux.Transformer T202 Buchholz relay Trip operated47749-1 OSATStation Aux.Transformer T202 Oil temperature high - Alarm47849-2 OSATStation Aux.Transformer T202 Oil temperature very high - Trip47949-1 WSATStation Aux.Transformer T202 Winding Temperature high - Alarm48049-2 WSATStation Aux.Transformer T202 Winding Temperature very high - Trip48171 SATStation Aux.Transformer T202 Low Oil Level - Alarm48263 P SATStation Aux.Transformer T202 Pressure Relief Device operated - Trip48363 OLTCStation Aux.Transformer T202 OLTC Buchholz trip48427Station Aux. Transformer T202 Tap changer device failure alarm48551G LVStation Aux.Transformer T202 Neutral Ground Fault protection operated48650/51Station Aux.Transformer T202 HV BKR INST/ Inverse Time O/C Phase-A operated48750/51Station Aux.Transformer T202 HV BKR INST/ Inverse Time O/C Phase-B operated48850/51Station Aux.Transformer T202 HV BKR INST/ Inverse Time O/C Phase-C operated48950N/51NStation Aux.Transformer T202 HV BKR INST/ Inverse Time Ground fault protection operated49050/51NStation Aux.Transformer T202 HV BKR INST/ Inverse Time O/C, E/F relay faulty.49150GStation Aux.Transformer T202 HV BKR CBCT protection operated49286 B225Station Aux.Transformer T202 HV BKR lockout relay operated49374/86Station Aux.Transformer T202 HV BKR Lockout relay supervision relay operated49486 A102Station Aux.Transformer T202 LV BKR Lockout relay operated49574/86Station Aux.Transformer T202 LV BKR Lockout relay supervision relay operated49674 TCStation Aux.Transformer T202 LV BKR Trip coil supervision relay operated49774 DCStation Aux.Transformer T202 LV BKR DC supply supervision relay operated49851Station Aux.Transformer T202 LV BKR inverse time O/C Phase-A operated49951Station Aux.Transformer T202 LV BKR inverse time O/C Phase-B operated50051Station Aux.Transformer T202 LV BKR inverse time O/C Phase-C operated50151NStation Aux.Transformer T202 LV BKR inverse time earthfault relay operated50251/51NStation Aux.Transformer T202 LV BKR inverse time O/C, E/F relay faulty503OLTC pressure relief device operated504OLTC protection relay operated505OLTC Low oil level alarm506Transformer membrane failure alarm507Maintenance switch openNStation Auxiliary Transformer (Future Unit)50863-1 SATStation Aux.Transformer (Future) Buchholz relay alarm operated50963-2 SATStation Aux.Transformer (Future) Buchholz relay Trip operated51049-1 OSATStation Aux.Transformer (Future) Oil temperature high - Alarm51149-2 OSATStation Aux.Transformer (Future) Oil temperature very high - Trip51249-1 WSATStation Aux.Transformer (Future) Winding Temperature high - Alarm51349-2 WSATStation Aux.Transformer (Future) Winding Temperature very high - Trip51471 SATStation Aux.Transformer (Future) Low Oil Level - Alarm51563 P SATStation Aux.Transformer (Future) Pressure Relief Device operated - Trip51663 OLTCStation Aux.Transformer (Future) OLTC Buchholz trip51727Station Aux. Transformer (Future) Tap changer device failure alarm51851G LVStation Aux.Transformer (Future) Neutral Ground Fault protection operated51950/51Station Aux.Transformer (Future) HV BKR INST/ Inverse Time O/C Phase-A operated52050/51Station Aux.Transformer (Future) HV BKR INST/ Inverse Time O/C Phase-B operated52150/51Station Aux.Transformer (Future) HV BKR INST/ Inverse Time O/C Phase-C operated52250N/51NStation Aux.Transformer (Future) HV BKR INST/ Inverse Time Ground fault protection operated52350/51NStation Aux.Transformer (Future)HV BKR INST/ Inverse Time O/C, E/F relay faulty.52450GStation Aux.Transformer (Future) HV BKR CBCT protection operated52586 B221Station Aux.Transformer (Future) HV BKR lockout relay operated52674/86Station Aux.Transformer (Future) HV BKR Lockout relay supervision relay operated52786Station Aux.Transformer (Future) LV BKR Lockout relay operated52874/86Station Aux.Transformer (Future) LV BKR Lockout relay supervision relay operated52974 TCStation Aux.Transformer (Future) LV BKR Trip coil supervision relay operated53074 DCStation Aux.Transformer (Future) LV BKR DC supply supervision relay operated53151Station Aux.Transformer (Future) LV BKR inverse time O/C Phase-A operated53251Station Aux.Transformer (Future) LV BKR inverse time O/C Phase-B operated53351Station Aux.Transformer (Future) LV BKR inverse time O/C Phase-C operated53451NStation Aux.Transformer (Future) LV BKR inverse time earthfault relay operated53551/51NStation Aux.Transformer (Future) LV BKR inverse time O/C, E/F relay faulty536OLTC pressure relief device operated537OLTC protection relay operated538OLTC Low oil level alarm539Transformer membrane failure alarm540Maintenance switch openOStation Transformer ST T40154163-1 STStation Transformer T401 Buchholz relay alarm operated54263-2 STStation Transformer T401 Buchholz relay Trip operated54349-1 OSTStation Transformer T401 Oil temperature high - Alarm54449-2 OSTStation Transformer T401 Oil temperature very high - Trip54549-1 WSTStation Transformer T401 Winding Temperature high - Alarm54649-2 WSTStation Transformer T401 Winding Temperature very high - Trip54771 STStation Transformer T401 Low Oil Level - Alarm54863 PSTStation Transformer T401 Pressure Relief Device operated - Trip54951G1Station Transformer T401 Neutral Ground fault protection-1 operated55051G2Station Transformer T401 Neutral Ground fault protection-2 operated55151G1Station Transformer T401 Neutral Ground fault Relay-1 faulty55251G2Station Transformer T401 Neutral Ground fault Relay-2 faulty55387REF LVStation Transformer T401 REF protection operated55487REF LVStation Transformer T401 REF Relay faulty55550/51Station Transformer T401 HV BKR INST/Inverse Time O/C Phase-A operated55650/51Station Transformer T401 HV BKR INST/Inverse Time O/C Phase-B operated55750/51Station Transformer T401 HV BKR INST/Inverse Time O/C Phase-C operated55850N/51NStation Transformer T401 HV BKR INST/Inverse Time Ground fault protection operated55950/51NStation Transformer T401 HV BKR INST/Inverse Time O/C, E/F relay faulty.56087T T401Station Transformer T401 Differential Protection operated56187T T401Station Transformer T401 Differential Protection relay faulty5622/50 BFStation Transformer T401 HV side Breaker failure protection Timer operated -I stage Alarm56350 BFStation Transformer T401 HV side Breaker failure relay operated -II stage56486-1 B419Station Transformer T401 Lockout relay-1 operated56586-2 B419Station Transformer T401 Lockout relay-2 operated56686-3 B419Station Transformer T401 Lockout relay-3 operated56774/86-1Station Transformer T401 Lockout relay-1 supervision relay operated56874/86-2Station Transformer T401 Lockout relay-2 supervision relay operated56974/86-3Station Transformer T401 Lockout relay-3 supervision relay operated57074 TC-1Station Transformer T401 HV BKRTrip Coil-1 Supervision relay operated57174 TC-2Station Transformer T401 HV BKRTrip Coil-2 Supervision relay operated57286-1Station Transformer T401 HV BKR Lockout relay -1 operated57386-2Station Transformer T401 HV BKR Lockout relay -2 operated57474/86-1Station Transformer T401 HV BKR Lockout relay-1 supervision relay operated57574/86-2Station Transformer T401 HV BKR Lockout relay-2 supervision relay operated57650/51Station Transformer T401 LV BKR INST/Inverse Time O/C Phase-A operated57750/51Station Transformer T401 LV BKR INST/Inverse Time O/C Phase-B operated57850/51Station Transformer T401 LV BKR INST/Inverse Time O/C Phase-C operated57951NStation Transformer T401 LV BKR Inverse Time E/F relay operated58050/51NStation Transformer T401 LV BKR INST/Inverse Time O/C, E/F relay faulty58186 A201Station Transformer T401 LV BKR Lockout relay operated58274/86Station Transformer T401 LV BKR Lockout relay supervision relay operated58374 TC-1Station Transformer T401 LV BKR tripcoil-1 supervision operated58474 TC-2Station Transformer T401 LV BKR tripcoil-2 supervision operated585Maintenance switch open586Breaker failure relay stage-1operated587Breaker failure relay stage-2 operated588Breaker failurerelay lockout relay operated589Breaker failurerelay lockout relay supervision relay operatedPStation Transformer ST T40259063-1 STStation Transformer T402 Buchholz relay alarm operated59163-2 STStation Transformer T402 Buchholz relay Trip operated59249-1 OSTStation Transformer T402 Oil temperature high - Alarm59349-2 OSTStation Transformer T402 Oil temperature very high - Trip59449-1 WSTStation Transformer T402 Winding Temperature high - Alarm59549-2 WSTStation Transformer T402 Winding Temperature very high - Trip59671 STStation Transformer T402 Low Oil Level - Alarm59763 PSTStation Transformer T402 Pressure Relief Device operated - Trip59851G1Station Transformer T402 Neutral Ground fault protection-1 operated59951G2Station Transformer T402 Neutral Ground fault protection-2 operated60051G1Station Transformer T402 Neutral Ground fault Relay-1 faulty60151G2Station Transformer T402 Neutral Ground fault Relay-2 faulty60287REF LVStation Transformer T402 REF protection operated60387REF LVStation Transformer T402 REF Relay faulty60450/51Station Transformer T402 HV BKR INST/Inverse Time O/C Phase-A operated60550/51Station Transformer T402 HV BKR INST/Inverse Time O/C Phase-B operated60650/51Station Transformer T402 HV BKR INST/Inverse Time O/C Phase-C operated60750N/51NStation Transformer T402 HV BKR INST/Inverse Time Ground fault protection operated60850/51NStation Transformer T402 HV BKR INST/Inverse Time O/C, E/F relay faulty60987T T402Station Transformer T402 Differential Protection operated61087T T402Station Transformer T402 Differential Protection relay faulty6112/50 BFStation Transformer T402 HV side Breaker failure protection Timer operated -I stage Alarm61250 BFStation Transformer T402 HV side Breaker failure relay operated -II stage61386-1 B421Station Transformer T402 Lockout relay-1 operated61486-2 B421Station Transformer T402 Lockout relay-2 operated61586-3 B421Station Transformer T402 Lockout relay-3 operated61674/86-1Station Transformer T402 Lockout relay-1 supervision relay operated61774/86-2Station Transformer T402 Lockout relay-2 supervision relay operated61874/86-3Station Transformer T402 Lockout relay-3 supervision relay operated61974 TC-1Station Transformer T402 HV BKRTrip Coil-1 Supervision relay operated62074 TC-2Station Transformer T402 HV BKRTrip Coil-2 Supervision relay operated62186-1Station Transformer T402 HV BKR Lockout relay -1 operated62286-2Station Transformer T402 HV BKR Lockout relay -2 operated62374/86-1Station Transformer T402 HV BKR Lockout relay-1 supervision relay operated62474/86-2Station Transformer T402 HV BKR Lockout relay-2 supervision relay operated62550/51Station Transformer T402 LV BKR O/C Phase-A operated62650/51Station Transformer T402 LV BKR O/C Phase-B operated62750/51Station Transformer T402 LV BKR O/C Phase-C operated62851NStation Transformer T402 LV BKR Inverse Time E/F relay operated62950/51NStation Transformer T402 LV BKR INST/Inverse Time O/C, E/F relay faulty63086 A203Station Transformer T402 LV BKR Lockout relay operated63174/86Station Transformer T402 LV BKR Lockout relay supervision relay operated63274 TC-1Station Transformer T402 LV BKR tripcoil-1 supervision operated63374 TC-2Station Transformer T402 LV BKR tripcoil-2 supervision operated634Maintenance switch open635Breaker failure relay stage-1operated636Breaker failure relay stage-2 operated637Breaker failurerelay lockout relay operated638Breaker failurerelay lockout relay supervision relay operatedQStation Transformer (Future Unit)63963-1 STStation Transformer (Future) Buchholz relay alarm operated64063-2 STStation Transformer (Future) Buchholz relay Trip operated64149-1 OSTStation Transformer (Future) Oil temperature high - Alarm64249-2 OSTStation Transformer (Future) Oil temperature very high - Trip64349-1 WSTStation Transformer (Future) Winding Temperature high - Alarm64449-2 WSTStation Transformer (Future) Winding Temperature very high - Trip64571 STStation Transformer (Future) Low Oil Level - Alarm64663 PSTStation Transformer (Future) Pressure Relief Device operated - Trip64751G1Station Transformer (Future) Neutral Ground fault protection-1 operated64851G2Station Transformer (Future) Neutral Ground fault protection-2 operated64951G1Station Transformer (Future) Neutral Ground fault Relay-1 faulty65051G2Station Transformer (Future) Neutral Ground fault Relay-2 faulty65187REF LVStation Transformer (Future) REF protection operated65287REF LVStation Transformer (Future) REF Relay faulty65350/51Station Transformer (Future) HV BKR INST/Inverse Time O/C Phase-A operated65450/51Station Transformer (Future) HV BKR INST/Inverse Time O/C Phase-B operated65550/51Station Transformer (Future) HV BKR INST/Inverse Time O/C Phase-C operated65650N/51NStation Transformer (Future) HV BKR INST/Inverse Time Ground fault protection operated65750/51NStation Transformer (Future) HV BKR INST/Inverse Time O/C, E/F relay faulty.65887T T403Station Transformer (Future) Differential Protection operated65987T T403Station Transformer (Future) Differential Protection relay faulty6602/50 BFStation Transformer (Future) HV side Breaker failure protection Timer operated -I stage Alarm66150 BFStation Transformer (Future) HV side Breaker failure relay operated -II stage66286-1Station Transformer (Future) Lockout relay-1 operated66386-2Station Transformer (Future) Lockout relay-2 operated66486-3Station Transformer (Future) Lockout relay-3 operated66574/86-1Station Transformer (Future) Lockout relay-1 supervision relay operated66674/86-2Station Transformer (Future) Lockout relay-2 supervision relay operated66774/86-3Station Transformer (Future) Lockout relay-3 supervision relay operated66874 TC-1Station Transformer (Future) HV BKRTrip Coil-1 Supervision relay operated66974 TC-2Station Transformer (Future) HV BKRTrip Coil-2 Supervision relay operated67086-1Station Transformer (Future) HV BKR Lockout relay -1 operated67186-2Station Transformer (Future) HV BKR Lockout relay -2 operated67274/86-1Station Transformer (Future) HV BKR Lockout relay-1 supervision relay operated67374/86-2Station Transformer (Future) HV BKR Lockout relay-2 supervision relay operated67450/51Station Transformer (Future) LV BKR INST/Inverse Time O/C Phase-A operated67550/51Station Transformer (Future) LV BKR INST/Inverse Time O/C Phase-B operated67650/51Station Transformer (Future) LV BKR INST/Inverse Time O/C Phase-C operated67751NStation Transformer (Future) LV BKR Inverse Time E/F relay operated67850/51NStation Transformer (Future) LV BKR INST/Inverse Time O/C, E/F relay faulty67986Station Transformer (Future) LV BKR Lockout relay operated68074/86Station Transformer (Future) LV BKR Lockout relay supervision relay operated68174 TC-1Station Transformer (Future) LV BKR tripcoil-1 supervision operated68274 TC-2Station Transformer (Future) LV BKR tripcoil-2 supervision operated683Maintenance switch open684Breaker failure relay stage-1operated685Breaker failure relay stage-2 operated686Breaker failurerelay lockout relay operated687Breaker failurerelay lockout relay supervision relay operatedR4.16kV Switchgear68887 B14.16kV Switchgear Bus Section-1 87 B1 Phase-A operated68987 B14.16kV Switchgear Bus Section-1 87 B1 Phase-B operated69087 B14.16kV Switchgear Bus Section-1 87 B1 Phase-C operated69187 B24.16kV Switchgear Bus Section-2 87 B2 Phase-A operated69287 B24.16kV Switchgear Bus Section-2 87 B2 Phase-B operated69387 B24.16kV Switchgear Bus Section-2 87 B2 Phase-C operated694514.16kV Bus Section breaker Inverse time O/C Phase-A operated695514.16kV Bus Section breaker Inverse time O/C Phase-B operated696514.16kV Bus Section breaker Inverse time O/C Phase-C operated69751N4.16kV Bus Section breaker Ground fault protection operated69851/51N4.16kV Bus Section breaker O/C, E/F relay faulty69986 A2054.16kV Bus section breaker Lockout relay operated70074/864.16kV Bus section breaker Lockout supervision relay operated70174 DC4.16kV Bus section breaker DC supply failure relay operated.70274 TC-14.16kV Bus Section breaker trip coil-1 supervision relay operated70374 TC-24.16kV Bus Section breaker trip coil-2 supervision relay operated70495B14.16kV SWGR Busbar-1 CT supervision relay(95B1) phase-A operated70595B14.16kV SWGR Busbar-1 CT supervision relay(95B1) phase-B operated70695B14.16kV SWGR Busbar-1 CT supervision relay(95B1) phase-C operated70795B24.16kV SWGR Busbar-1 CT supervision relay(95B2) phase-A operated70895B24.16kV SWGR Busbar-1 CT supervision relay(95B2) phase-B operated70995B24.16kV SWGR Busbar-1 CT supervision relay(95B2) phase-C operated71095BX14.16kV SWGR Bus-1 BB protection CT shorting lockout Relay (95BX1) operated71195BX24.16kV SWGR Bus-2 BB protection CT shorting lockout Relay (95BX2) operated71286B14.16 SWGR BB-1 Protection lock relay operated71386B24.16 SWGR BB-2 Protection lock relay operated71474/86B14.16 SWGR BB-1 lock relay coil supervision 74/86B1 operated.71574/86B24.16 SWGR BB-2 lock relay coil supervision 74/86B2 operated.71674DC14.16kV SWGR Bus section 74DC1 failed71774DC24.16kV SWGR Bus section 74DC2 failed718274.16 kV SWGR Bus-1 UV trip lockout relay(27/UV) operated719274.16 kV SWGR Bus-2 UV trip lockout relay(27/UV) operated720STMGTG-7 Starting motor protection relay operated72150M/51MGTG-7 starting motor feeder O/C Phase-A operated72250M/51MGTG-7 starting motor feeder O/C Phase-B operated72350M/51MGTG-7 starting motor feeder O/C Phase-C operated72450M/51MGTG-7 starting motor feeder O/C relay faulty72550GGTG-7 starting motor feeder CBCT fault protection operated72686MGTG-7 starting motor feeder breaker lockout relay operated72774 TC-1GTG-7 starting motor feeder breaker trip coil-1supervision relay operated72874 TC-2GTG-7 starting motor feeder breaker trip coil-2 supervision relay operated72974/86GTG-7 starting motor feeder breaker lockout relay supervision relay operated73049-1BGTG-7 starting motor bearing temperature high alarm73149-2BGTG-7 starting motor bearing temperature very high trip73249AGTG-7 starting motor cooler failure733WTI AGTG-7 starting motor winding temperature high alarm734WTI TRIPGTG-7 starting motor winding temperature very high trip735STMGTG-8 Starting motor protection relay operated73650M/51MGTG-7 starting motor feeder O/C Phase-A operated73750M/51MGTG-7 starting motor feeder O/C Phase-B operated73850M/51MGTG-7 starting motor feeder O/C Phase-C operated73950M/51MGTG-7 starting motor feeder O/C relay faulty74050GGTG-8 starting motor feeder CBCT fault protection operated74186MGTG-8 starting motor feeder breaker lockout relay operated74274 TC-1GTG-8 starting motor feeder breaker trip coil-1supervision relay operated74374 TC-2GTG-8 starting motor feeder breaker trip coil-2 supervision relay operated74474/86GTG-8 starting motor feeder breaker lockout relay supervision relay operated74549-1BGTG-8 starting motor bearing temperature high alarm74649-2BGTG-8 starting motor bearing temperature very high trip74749AGTG-8 starting motor cooler failure748WTI AGTG-8 starting motor winding temperature high alarm749WTI TRIPGTG-8 starting motor winding temperature very high trip750STMFuture GTG Starting motor protection relay operated75150M/51MGTG-7 starting motor feeder O/C Phase-A operated75250M/51MGTG-7 starting motor feeder O/C Phase-B operated75350M/51MGTG-7 starting motor feeder O/C Phase-C operated75450M/51MGTG-7 starting motor feeder O/C relay faulty75550GFuture GTG starting motor feeder CBCT fault protection operated75686MFuture GTG starting motor feeder breaker lockout relay operated75774 TC-1Future GTG starting motor feeder breaker trip coil-1supervision relay operated75874 TC-2Future GTG starting motor feeder breaker trip coil-2 supervision relay operated75974/86Future GTG starting motor feeder breaker lockout relay supervision relay operated76049-1BFuture GTG starting motor bearing temperature high alarm76149-2BFuture GTG starting motor bearing temperature very high trip76249AFuture GTG starting motor cooler failure763WTI AFuture GTG starting motor winding temperature high alarm764WTI TRIPFuture GTG starting motor winding temperature very high trip765S480V Station Switchgear76651480V Bus Section breaker Inverse time O/C Phase-A operated76751480V Bus Section breaker Inverse time O/C Phase-B operated76851480V Bus Section breaker Inverse time O/C Phase-C operated76951N480V Bus Section breaker Inverse time E/F relay operated77051480V Bus Section breaker Inverse time O/C, E/F Relay faulty77186 A103480V Bus section breaker Lockout relay operated77274/86480V Bus section breaker Lockout relay Supervision relay operated77374 DC480V Bus section breaker DC supply failure relay operated77474 TC480V Bus Section breaker trip circuit supervision relay operated77527480V Bus Section-1 UV trip lockout relay(27/UV) operated77627480V Bus Section-2 UV trip lockout relay(27/UV) operatedTFuel oil System777Forwarding pump1 Trip778Forwarding pump2 Trip779Forwarding pump3 Trip780Forwarding pump4 Trip781Level switch High High DFO Tank#1(FOS-10-LSHH-01)782Level switch High DFO Tank#1(FOS-10-LSH-02)783Level switch Low DFO Tank#1(FOS-10-LSL-03)784Level switch Low Low DFO Tank#1(FOS-10-LSLL-04)785Level switch High High DFO Tank#2(FOS-10-LSHH-05)786Level switch High DFO Tank#2(FOS-10-LSH-06)787Level switch Low DFO Tank#2(FOS-10-LSL-07)788Level switch Low Low DFO Tank#2(FOS-10-LSLL-08)789Level switch High High DFO Tank#3(FOS-10-LSHH-09)790Level switch High DFO Tank#3(FOS-10-LSH-10)791Level switch Low DFO Tank#3(FOS-10-LSL-11)792Level switch Low Low DFO Tank#3(FOS-10-LSLL-12)793Level switch High High DFO Tank#4(FOS-10-LSHH-13)794Level switch High DFO Tank#4(FOS-10-LSH-14)795Level switch Low DFO Tank#4(FOS-10-LSL-15)796Level switch Low Low DFO Tank#4(FOS-10-LSLL-16)VEXCITATION(Unit-7)79764FField ground fault79894EX-1Exciter trip output relay79959FExciter OvervoltageVEXCITATION (Unit-8)80064FField ground fault80194EX-1Exciter trip output relay80259FExciter OvervoltageVEXCITATION (Future Unit)80364FField ground fault80494EX-1Exciter trip output relay80559FExciter OvervoltageWMISCELLANEOUSUnit-780674GT/52GTGas Turbine fault inducing generator trip80798(VT-2)Voltage Transformer -2 fuse fail80898(VT-4)Voltage Transformer -4 fuse fail809NGT alarmNGT Over heating alarm810NGT tripNGT Over heating tripUnit-881174GT/52GTGas Turbine fault inducing generator trip81298(VT-2)Voltage Transformer -2 fuse fail81398(VT-4)Voltage Transformer -4 fuse fail814NGT alarmNGT Over heating alarm815NGT tripNGT Over heating tripFuture Unit81674GT/52GTGas Turbine fault inducing generator trip81798(VT-2)Voltage Transformer -2 fuse fail81898(VT-4)Voltage Transformer -4 fuse fail819NGT alarmNGT Over heating alarm820NGT tripNGT Over heating tripXOTHER ALARMSUnit-7821Bearing Vibration822Bearing Oil Temp.High823Negative Sequence Current824Generator OvervoltageUnit-8825Bearing Vibration826Bearing Oil Temp.High827Negative Sequence Current828Generator OvervoltageFuture Unit829Bearing Vibration830Bearing Oil Temp.High831Negative Sequence Current832Generator OvervoltageYSTATOR COOLING WATER SYSTEMUnit-7833Inlet Temp.High834Inlet Flow low835Inlet Pressure Low836Liquid Header Outlet Temp High837Bulk water Outlet Temp.High838Conn.Ring Temp.High839Conn.Ring Flow Low840HV Bushing Outlet Temp.High841HV Bushing Flow Low842Main Filter Diff.Pressure High843Conductivity High844Tank Level High/Low845Reservce Pump running846Runback InitiatedUnit-8847Inlet Temp.High848Inlet Flow low849Inlet Pressure Low850Liquid Header Outlet Temp High851Bulk water Outlet Temp.High852Conn.Ring Temp.High853Conn.Ring Flow Low854HV Bushing Outlet Temp.High855HV Bushing Flow Low856Main Filter Diff.Pressure High857Conductivity High858Tank Level High/Low859Reservce Pump running860Runback InitiatedFuture Unit861Inlet Temp.High862Inlet Flow low863Inlet Pressure Low864Liquid Header Outlet Temp High865Bulk water Outlet Temp.High866Conn.Ring Temp.High867Conn.Ring Flow Low868HV Bushing Outlet Temp.High869HV Bushing Flow Low870Main Filter Diff.Pressure High871Conductivity High872Tank Level High/Low873Reservce Pump running874Runback InitiatedNOTE : The points considerd above are excluding the required no.of spare points and Minimum points as per clause 7.1 and 7.2 of PTS document 1022 Appendix-V

&C&"Arial,Bold"Annexure-1: SOER Signals for Arar Power Plant&C&P of &N