SOER Input Signals for Arar_rev1

278171494.xlsSECTION :cover sheeet SHEET 1 OF 22

TCE CONSULTING ENGINEERS LIMITEDSHEET 1 OF 1

I/O LIST FOR SEQUENCE OF EVENTS RECORDER

SAUDI ELECTRICITY COMPANYEASTERN OPERATING AREA

Dammam, Saudi Arabia

GENERATION EXPANSION OF ARAR POWER PLANT(CONTRACT NO : 30421007/00)

I/O LIST FOR SEQUENCE OF EVENTS RECORDER

DOCUMENT NO : 30421007-3OQ-00002-P0A

MARCH 2005

ENGINEERING CONSULTANTTCE CONSULTING ENGINEERS LIMITED

73/1, ST.MARK'S ROADBANGALORE 560001

INDIA

CONTRACTOR:AL-TOUKHI COMPANY FOR INDUSTRY & TRADING

P.O.BOX 497, RIYADH 11411, KINGDOM OF SAUDI ARABIATEL.00966-1-4633660 : FAX.00966-1-4631150

P0A 16-03-05 AE SR

REV NO. DATE PREPARED BY CHECKED BY CLEARED BY APPROVED BY

30421007-3OQ-00002-P0A

278171494.xlsSECTION :cover sheeet SHEET 2 OF 22

REV NO. DATE PREPARED BY CHECKED BY CLEARED BY APPROVED BY

Annexure-1: SOER Signals for Arar Power Plant

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SL.No. Tag No. List of Digital Signals for SOER Remarks

A. GTG-71 81O Over Frequency alarm -G60A2 81O Over Frequency alarm- G60B3 24 Volts/Hertz Alarm-G60A4 24 Volts/Hertz Alarm -G60B5 27P Under voltage Alarm-G60A 6 27P Under voltage Alarm-G60B7 32-1 Reverse power Trip -G60A8 32-2 Reverse power Trip -G60B9 40-1,2 Loss of excitation Trip -G60A

10 40-1,2 Loss of excitation Trip -G60B11 46 Generator unbalance(Negative sequence) trip G60A12 46 Generator unbalance(Negative sequence) trip G60B13 51PV Voltage Restrained Overcurrent-Trip -G60A14 51PV Voltage Restrained Overcurrent-Trip -G60B15 59P Over voltage Alarm-G60A16 59P Over voltage Alarm-G60B17 81 U Under frequency Trip-G60A18 81 U Under frequency Trip-G60B19 87S Stator Differential Trip-G60A20 87S Stator Differential Trip-G60B21 27TN 3rd Harmoic Neutral Undervoltage Trip-G60A22 27TN 3rd Harmoic Neutral Undervoltage Trip-G60B23 50/27 Inadvertance energization Trip-G60A24 50/27 Inadvertance energization Trip -G60B25 21 Phase Distance Trip-G60A 26 21 Phase Distance Trip-G60B 27 78 Out of step Trip-G60A28 78 Out of step Trip-G60B

As per GE's dwg no.GR0976-207D3312


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SL.No. Tag No. List of Digital Signals for SOER Remarks29 59N Over voltage Neutral Trip-G60A30 59N Over voltage Neutral Trip-G60B31 VTFF Voltage transformer fuse failure Alarm-G60A32 VTFF Voltage transformer fuse failure Alarm-G60B

33 G60A fail Alarm

34 G60B fail Alarm

B. GTG-835 81O Over Frequency alarm -G60A36 81O Over Frequency alarm- G60B37 24 Volts/Hertz Alarm-G60A38 24 Volts/Hertz Alarm -G60B39 27P Under voltage Alarm-G60A 40 27P Under voltage Alarm-G60B41 32-1 Reverse power Trip -G60A42 32-2 Reverse power Trip -G60B43 40-1,2 Loss of excitation Trip -G60A 44 40-1,2 Loss of excitation Trip -G60B45 46 Generator unbalance(Negative sequence) trip G60A46 46 Generator unbalance(Negative sequence) trip G60B47 51PV Voltage Restrained Overcurrent-Trip -G60A48 51PV Voltage Restrained Overcurrent-Trip -G60B49 59P Over voltage Alarm-G60A50 59P Over voltage Alarm-G60B51 81 U Under frequency Trip-G60A52 81 U Under frequency Trip-G60B53 87S Stator Differential Trip-G60A54 87S Stator Differential Trip-G60B

Critical FailureCritical Failure

As per GE's dwg no.GR0976-207D3312


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SL.No. Tag No. List of Digital Signals for SOER Remarks55 27TN 3rd Harmoic Neutral Undervoltage Trip-G60A56 27TN 3rd Harmoic Neutral Undervoltage Trip-G60B57 50/27 Inadvertance energization Trip-G60A58 50/27 Inadvertance energization Trip -G60B59 21 Phase Distance Trip-G60A 60 21 Phase Distance Trip-G60B 61 78 Out of step Trip-G60A62 78 Out of step Trip-G60B63 59N Over voltage Neutral Trip-G60A64 59N Over voltage Neutral Trip-G60B65 VTFF Voltage transformer fuse failure Alarm-G60A66 VTFF Voltage transformer fuse failure Alarm-G60B

67 G60A fail Alarm

68 G60B fail Alarm C. Future GTG

69 81O Over Frequency alarm -G60A70 81O Over Frequency alarm- G60B71 24 Volts/Hertz Alarm-G60A72 24 Volts/Hertz Alarm -G60B73 27P Under voltage Alarm-G60A 74 27P Under voltage Alarm-G60B75 32-1 Reverse power Trip -G60A76 32-2 Reverse power Trip -G60B77 40-1,2 Loss of excitation Trip -G60A 78 40-1,2 Loss of excitation Trip -G60B79 46 Generator unbalance(Negative sequence) trip G60A80 46 Generator unbalance(Negative sequence) trip G60B81 51PV Voltage Restrained Overcurrent-Trip -G60A82 51PV Voltage Restrained Overcurrent-Trip -G60B



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SL.No. Tag No. List of Digital Signals for SOER Remarks83 59P Over voltage Alarm-G60A84 59P Over voltage Alarm-G60B85 81 U Under frequency Trip-G60A86 81 U Under frequency Trip-G60B87 87S Stator Differential Trip-G60A88 87S Stator Differential Trip-G60B89 27TN 3rd Harmoic Neutral Undervoltage Trip-G60A90 27TN 3rd Harmoic Neutral Undervoltage Trip-G60B91 50/27 Inadvertance energization Trip-G60A92 50/27 Inadvertance energization Trip -G60B93 21 Phase Distance Trip-G60A 94 21 Phase Distance Trip-G60B 95 78 Out of step Trip-G60A96 78 Out of step Trip-G60B97 59N Over voltage Neutral Trip-G60A98 59N Over voltage Neutral Trip-G60B99 VTFF Voltage transformer fuse failure Alarm-G60A

100 VTFF Voltage transformer fuse failure Alarm-G60B

101 G60A fail Alarm

102 G60B fail Alarm

D. Generator Transformer of Unit-7103 63-1 GT T607 Buchholz relay alarm operated 104 63-2 GT T607 Buchholz relay Trip operated 105 63-1 OLTC OLTC of T607 Buchholz relay alarm operated106 63-2 OLTC OLTC of T607 Buchholz relay Trip operated107 49-1 OGT T607 Oil temperature high - Alarm 108 49-2 OGT T607 Oil temperature very high - Trip 109 49-1 WGT T607 Winding Temperature high - Alarm



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SL.No. Tag No. List of Digital Signals for SOER Remarks110 49-2 WGT T607 Winding Temperature very high - Trip 111 71 GT T607 Low Oil Level - Trip 112 63 PRGT T607 Pressure Relief Device operated - Trip

113 T607 Cooling System failed - Trip114 87 GT T607 87GT Differential protection PH-A operated115 87 GT T607 87GT Differential protection PH-B operated116 87 GT T607 87GT Differential protection PH-C operated117 87 GTG T607 Restricted Ground Differential protection operated 118 51N GGT T607 Ground Over Current backup protection operated119 87 OA T607 Overall Unit Differential Protection PH-A operated120 87 OA T607 Overall Unit Differential Protection PH-B operated121 87 OA T607 Overall Unit Differential Protection PH-C operated122 87 GT FDR T607 132kV side Feeder Differential protection PH-A operated 123 87 GT FDR T607132kV side Feeder Differential protection PH-B operated 124 87 GT FDR T607 132kV side Feeder Differential protection PH-C operated 125 86 GT-1 Gen.Transformer T607 Lockout relay-1 operated126 74/86 Gen.Transformer T607 Lockout relay-1 supervision relay operated127 86 GT-2 Gen.Transformer T607 Lockout relay-2 operated128 74/86 Gen.Transformer T607 Lockout relay-2 supervision relay operated129 51 GT T607 phase fault back up over current protection PH-A operated130 51 GT T607 phase fault back up over current protection PH-B operated131 51 GT T607 phase fault back up over current protection PH-C operated132 27 T607 Tap changer device fail alarm

E. Generator Transformer of Unit-8133 63-1 GT T608 Buchholz relay alarm operated 134 63-2 GT T608 Buchholz relay Trip operated 135 63-1 OLTC OLTC of T608 Buchholz relay alarm operated136 63-2 OLTC OLTC of T608 Buchholz relay Trip operated137 49-1 OGT T608 Oil temperature high - Alarm 138 49-2 OGT T608 Oil temperature very high - Trip

COOLER FAILURE


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SL.No. Tag No. List of Digital Signals for SOER Remarks139 49-1 WGT T608 Winding Temperature high - Alarm 140 49-2 WGT T608 Winding Temperature very high - Trip 141 71 GT T608 Low Oil Level - Trip 142 63 PRGT T608 Pressure Relief Device operated - Trip


F Generator Transformer of Unit-5163 63-1 GT T605 Buchholz relay alarm operated 164 63-2 GT T605 Buchholz relay Trip operated 165 63-1 OLTC OLTC of T605 Buchholz relay alarm operated166 63-2 OLTC OLTC of T605 Buchholz relay Trip operated

COOLER FAILURE


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SL.No. Tag No. List of Digital Signals for SOER Remarks167 49-1 OGT T605 Oil temperature high - Alarm 168 49-2 OGT T605 Oil temperature very high - Trip 169 49-1 WGT T605 Winding Temperature high - Alarm 170 49-2 WGT T605 Winding Temperature very high - Trip 171 71 GT T605 Low Oil Level - Trip 172 63 PRGT T605 Pressure Relief Device operated - Trip


G Generator Transformer of Unit-6193 63-1 GT T606 Buchholz relay alarm operated 194 63-2 GT T606 Buchholz relay Trip operated

COOLER FAILURE


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SL.No. Tag No. List of Digital Signals for SOER Remarks195 63-1 OLTC OLTC of T606 Buchholz relay alarm operated196 63-2 OLTC OLTC of T606 Buchholz relay Trip operated197 49-1 OGT T606 Oil temperature high - Alarm 198 49-2 OGT T606 Oil temperature very high - Trip 199 49-1 WGT T606 Winding Temperature high - Alarm 200 49-2 WGT T606 Winding Temperature very high - Trip 201 71 GT T606 Low Oil Level - Trip 202 63 PRGT T606 Pressure Relief Device operated - Trip


H Generator Transformer of Future Unit

COOLER FAILURE


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SL.No. Tag No. List of Digital Signals for SOER Remarks223 63-1 GT T609 Buchholz relay alarm operated 224 63-2 GT T609 Buchholz relay Trip operated 225 63-1 OLTC OLTC of T609 Buchholz relay alarm operated226 63-2 OLTC OLTC of T609 Buchholz relay Trip operated227 49-1 OGT T609 Oil temperature high - Alarm 228 49-2 OGT T609 Oil temperature very high - Trip 229 49-1 WGT T609 Winding Temperature high - Alarm 230 49-2 WGT T609 Winding Temperature very high - Trip 231 71 GT T609 Low Oil Level - Trip 232 63 PRGT T609 Pressure Relief Device operated - Trip


COOLER FAILURE


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I Unit Auxiliary Transformer UAT 307240 49-1WUAT Unit Auxiliary Transformer Winding Temperature high - Alarm 241 49-2WUAT Unit Auxiliary Transformer Winding Temperature very high -Trip242 51G UAT Unit Auxiliary Transformer Ground Over Current protection operated 243 50/51 UAT Unit Auxiliary Transformer HV Side over current protection operated 244 50/51 Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection operated 245 51N Unit Auxiliary Transformer LV side Inverse Ground fault protection operated246 86-A201 Unit Auxiliary Transformer Breaker Lockout relay operated 247 74/86 Unit Auxiliary Transformer Breaker Lockout relay supervision relay operated 248 74/TC Unit Auxiliary Transformer Breaker Trip Coil Supervision relay operated 249 74/DC Unit Auxiliary Transformer Breaker DC Supply Failure relay operated

J Unit Auxiliary Transformer UAT 308250 49-1WUAT Unit Auxiliary Transformer Winding Temperature high - Alarm 251 49-2WUAT Unit Auxiliary Transformer Winding Temperature very high -Trip252 51G UAT Unit Auxiliary Transformer Ground Over Current protection operated 253 50/51 UAT Unit Auxiliary Transformer HV Side over current protection operated 254 50/51 Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection operated 255 51N Unit Auxiliary Transformer LV side Inverse Ground fault protection operated256 86 Unit Auxiliary Transformer Breaker Lockout relay operated 257 74/86 Unit Auxiliary Transformer Breaker Lockout relay supervision relay operated 258 74/TC Unit Auxiliary Transformer Breaker Trip Coil Supervision relay operated 259 74/DC Unit Auxiliary Transformer Breaker DC Supply Failure relay operated

K Unit Auxiliary Transformer (Future Unit)260 49-1WUAT Unit Auxiliary Transformer Winding Temperature high - Alarm 261 49-2WUAT Unit Auxiliary Transformer Winding Temperature very high -Trip262 51G UAT Unit Auxiliary Transformer Ground Over Current protection operated 263 50/51 UAT Unit Auxiliary Transformer HV Side over current protection operated


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SL.No. Tag No. List of Digital Signals for SOER Remarks264 50/51 Unit Auxiliary Transformer LV side INST/ Inverse Time Over current protection operated 265 51N Unit Auxiliary Transformer LV side Inverse Ground fault protection operated266 86 Unit Auxiliary Transformer Breaker Lockout relay operated 267 74/86 Unit Auxiliary Transformer Breaker Lockout relay supervision relay operated 268 74/TC Unit Auxiliary Transformer Breaker Trip Coil Supervision relay operated 269 74/DC Unit Auxiliary Transformer Breaker DC Supply Failure relay operated

L Station Auxiliary Transformer SAT T201270 63-1 SAT Station Aux.Transformer T201 Buchholz relay alarm operated 271 63-2 SAT Station Aux.Transformer T201 Buchholz relay Trip operated 272 49-1 OSAT Station Aux.Transformer T201 Oil temperature high - Alarm273 49-2 OSAT Station Aux.Transformer T201 Oil temperature very high - Trip 274 49-1 WSAT Station Aux.Transformer T201 Winding Temperature high - Alarm 275 49-2 WSAT Station Aux.Transformer T201 Winding Temperature very high - Trip 276 71 SAT Station Aux.Transformer T201 Low Oil Level - Alarm 277 63 P SAT Station Aux.Transformer T201 Pressure Relief Device operated - Trip278 63 OLTC Station Aux.Transformer T201 OLTC Buchholz trip 279 27 Station Aux. Transformer T201 Tap changer device failure alarm280 51G LV Station Aux.Transformer T201 Neutral Ground Fault protection operated 281 50/51 Station Aux.Transformer T201 HV BKR INST/ Inverse Time Over current protection operated282 50N/51N Station Aux.Transformer T201 HV BKR INST/ Inverse Time Ground fault protection operated283 50G Station Aux.Transformer T201 HV BKR CBCT protection operated284 86 B212 Station Aux.Transformer T201 HV BKR lockout relay operated285 74/86 Station Aux.Transformer T201 HV BKR Lockout relay supervision relay operated286 86 A101 Station Aux.Transformer T201 LV BKR Lockout relay operated287 74/86 Station Aux.Transformer T201 LV BKR Lockout relay supervision relay operated288 74 TC Station Aux.Transformer T201 LV BKR Trip coil supervision relay operated289 74 DC Station Aux.Transformer T201 LV BKR DC supply supervision relay operated290 51 Station Aux.Transformer T201 LV BKR inverse time overcurrent relay operated291 51N Station Aux.Transformer T201 LV BKR inverse time earthfault relay operated292 M Station Auxiliary Transformer SAT T202


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SL.No. Tag No. List of Digital Signals for SOER Remarks293 63-1 SAT Station Aux.Transformer T202 Buchholz relay alarm operated 294 63-2 SAT Station Aux.Transformer T202 Buchholz relay Trip operated 295 49-1 OSAT Station Aux.Transformer T202 Oil temperature high - Alarm296 49-2 OSAT Station Aux.Transformer T202 Oil temperature very high - Trip 297 49-1 WSAT Station Aux.Transformer T202 Winding Temperature high - Alarm 298 49-2 WSAT Station Aux.Transformer T202 Winding Temperature very high - Trip 299 71 SAT Station Aux.Transformer T202 Low Oil Level - Alarm 300 63 P SAT Station Aux.Transformer T202 Pressure Relief Device operated - Trip301 63 OLTC Station Aux.Transformer T202 OLTC Buchholz trip 302 27 Station Aux. Transformer T202 Tap changer device failure alarm303 51G LV Station Aux.Transformer T202 Neutral Ground Fault protection operated 304 50/51 Station Aux.Transformer T202 HV BKR INST/ Inverse Time Over current protection operated305 50N/51N Station Aux.Transformer T202 HV BKR INST/ Inverse Time Ground fault protection operated306 50G Station Aux.Transformer T202 HV BKR CBCT protection operated307 86 B225 Station Aux.Transformer T202 HV BKR lockout relay operated308 74/86 Station Aux.Transformer T202 HV BKR Lockout relay supervision relay operated309 86 A102 Station Aux.Transformer T202 LV BKR Lockout relay operated310 74/86 Station Aux.Transformer T202 LV BKR Lockout relay supervision relay operated311 74 TC Station Aux.Transformer T202 LV BKR Trip coil supervision relay operated312 74 DC Station Aux.Transformer T202 LV BKR DC supply supervision relay operated313 51 Station Aux.Transformer T202 LV BKR inverse time overcurrent relay operated314 51N Station Aux.Transformer T202 LV BKR inverse time earthfault relay operated

N Station Auxiliary Transformer (Future Unit)315 63-1 SAT Station Aux.Transformer (Future) Buchholz relay alarm operated 316 63-2 SAT Station Aux.Transformer (Future) Buchholz relay Trip operated 317 49-1 OSAT Station Aux.Transformer (Future) Oil temperature high - Alarm318 49-2 OSAT Station Aux.Transformer (Future) Oil temperature very high - Trip 319 49-1 WSAT Station Aux.Transformer (Future) Winding Temperature high - Alarm 320 49-2 WSAT Station Aux.Transformer (Future) Winding Temperature very high - Trip 321 71 SAT Station Aux.Transformer (Future) Low Oil Level - Alarm 322 63 P SAT Station Aux.Transformer (Future) Pressure Relief Device operated - Trip


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SL.No. Tag No. List of Digital Signals for SOER Remarks323 63 OLTC Station Aux.Transformer (Future) OLTC Buchholz trip 324 27 Station Aux. Transformer (Future) Tap changer device failure alarm325 51G LV Station Aux.Transformer (Future) Neutral Ground Fault protection operated 326 50/51 Station Aux.Transformer (Future) HV BKR INST/ Inverse Time Over current protection operated327 50N/51N Station Aux.Transformer (Future) HV BKR INST/ Inverse Time Ground fault protection operated328 50G Station Aux.Transformer (Future) HV BKR CBCT protection operated329 86 B221 Station Aux.Transformer (Future) HV BKR lockout relay operated330 74/86 Station Aux.Transformer (Future) HV BKR Lockout relay supervision relay operated331 86 Station Aux.Transformer (Future) LV BKR Lockout relay operated332 74/86 Station Aux.Transformer (Future) LV BKR Lockout relay supervision relay operated333 74 TC Station Aux.Transformer (Future) LV BKR Trip coil supervision relay operated334 74 DC Station Aux.Transformer (Future) LV BKR DC supply supervision relay operated335 51 Station Aux.Transformer (Future) LV BKR inverse time overcurrent relay operated336 51N Station Aux.Transformer (Future) LV BKR inverse time earthfault relay operated

O Station Transformer ST T401337 63-1 ST Station Transformer T401 Buchholz relay alarm operated 338 63-2 ST Station Transformer T401 Buchholz relay Trip operated 339 49-1 OST Station Transformer T401 Oil temperature high - Alarm340 49-2 OST Station Transformer T401 Oil temperature very high - Trip 341 49-1 WST Station Transformer T401 Winding Temperature high - Alarm342 49-2 WST Station Transformer T401 Winding Temperature very high - Trip 343 71 ST Station Transformer T401 Low Oil Level - Alarm 344 63 PST Station Transformer T401 Pressure Relief Device operated - Trip 345 51G1 Station Transformer T401 Neutral Ground fault protection-1 operated 346 51G2 Station Transformer T401 Neutral Ground fault protection-2 operated 347 87REF LV Station Transformer T401 REF protection operated 348 50/51 Station Transformer T401 HV BKR INST/Inverse Time Over current protection operated349 50N/51N Station Transformer T401 HV BKR INST/Inverse Time Overcurrent Ground fault protection operated350 87T T401 Station Transformer T401 Differential Protection operated 351 2/50 BF Station Transformer T401 HV side Breaker failure protection Timer operated -I stage Alarm 352 50 BF Station Transformer T401 HV side Breaker failure relay operated -II stage


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SL.No. Tag No. List of Digital Signals for SOER Remarks353 86-1 B419 Station Transformer T401 Lockout relay-1 operated 354 86-2 B419 Station Transformer T401 Lockout relay-2 operated 355 86-3 B419 Station Transformer T401 Lockout relay-3 operated 356 74/86-1 Station Transformer T401 Lockout relay-1 supervision relay operated 357 74/86-2 Station Transformer T401 Lockout relay-2 supervision relay operated 358 74/86-3 Station Transformer T401 Lockout relay-3 supervision relay operated 359 74 TC-1 Station Transformer T401 HV BKRTrip Coil-1 Supervision relay operated 360 74 TC-2 Station Transformer T401 HV BKRTrip Coil-2 Supervision relay operated 361 86-1 Station Transformer T401 HV BKR Lockout relay -1 operated362 86-2 Station Transformer T401 HV BKR Lockout relay -2 operated363 74/86-1 Station Transformer T401 HV BKR Lockout relay-1 supervision relay operated 364 74/86-2 Station Transformer T401 HV BKR Lockout relay-2 supervision relay operated 365 50/51 Station Transformer T401 LV BKR Over current protection operated 366 86 A201 Station Transformer T401 LV BKR Lockout relay operated 367 74/86 Station Transformer T401 LV BKR Lockout relay supervision relay operated 368 74 TC-1 Station Transformer T401 LV BKR tripcoil-1 supervision operated 369 74 TC-2 Station Transformer T401 LV BKR tripcoil-2 supervision operated

P Station Transformer ST T402370 63-1 ST Station Transformer T402 Buchholz relay alarm operated 371 63-2 ST Station Transformer T402 Buchholz relay Trip operated 372 49-1 OST Station Transformer T402 Oil temperature high - Alarm373 49-2 OST Station Transformer T402 Oil temperature very high - Trip 374 49-1 WST Station Transformer T402 Winding Temperature high - Alarm375 49-2 WST Station Transformer T402 Winding Temperature very high - Trip 376 71 ST Station Transformer T402 Low Oil Level - Alarm 377 63 PST Station Transformer T402 Pressure Relief Device operated - Trip 378 51G1 Station Transformer T402 Neutral Ground fault protection-1 operated 379 51G2 Station Transformer T402 Neutral Ground fault protection-2 operated 380 87REF LV Station Transformer T402 REF protection operated 381 50/51 Station Transformer T402 HV BKR INST/Inverse Time Over current protection operated382 50N/51N Station Transformer T402 HV BKR INST/Inverse Time Overcurrent Ground fault protection operated


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SL.No. Tag No. List of Digital Signals for SOER Remarks383 87T T402 Station Transformer T402 Differential Protection operated 384 2/50 BF Station Transformer T402 HV side Breaker failure protection Timer operated -I stage Alarm 385 50 BF Station Transformer T402 HV side Breaker failure relay operated -II stage386 86-1 B421 Station Transformer T402 Lockout relay-1 operated 387 86-2 B421 Station Transformer T402 Lockout relay-2 operated 388 86-3 B421 Station Transformer T402 Lockout relay-3 operated 389 74/86-1 Station Transformer T402 Lockout relay-1 supervision relay operated 390 74/86-2 Station Transformer T402 Lockout relay-2 supervision relay operated 391 74/86-3 Station Transformer T402 Lockout relay-3 supervision relay operated 392 74 TC-1 Station Transformer T402 HV BKRTrip Coil-1 Supervision relay operated 393 74 TC-2 Station Transformer T402 HV BKRTrip Coil-2 Supervision relay operated 394 86-1 Station Transformer T402 HV BKR Lockout relay -1 operated395 86-2 Station Transformer T402 HV BKR Lockout relay -2 operated396 74/86-1 Station Transformer T402 HV BKR Lockout relay-1 supervision relay operated 397 74/86-2 Station Transformer T402 HV BKR Lockout relay-2 supervision relay operated 398 50/51 Station Transformer T402 LV BKR Over current protection operated 399 86 A203 Station Transformer T402 LV BKR Lockout relay operated 400 74/86 Station Transformer T402 LV BKR Lockout relay supervision relay operated 401 74 TC-1 Station Transformer T402 LV BKR tripcoil-1 supervision operated 402 74 TC-2 Station Transformer T402 LV BKR tripcoil-2 supervision operated

Q Station Transformer (Future Unit)403 63-1 ST Station Transformer (Future) Buchholz relay alarm operated 404 63-2 ST Station Transformer (Future) Buchholz relay Trip operated 405 49-1 OST Station Transformer (Future) Oil temperature high - Alarm406 49-2 OST Station Transformer (Future) Oil temperature very high - Trip 407 49-1 WST Station Transformer (Future) Winding Temperature high - Alarm408 49-2 WST Station Transformer (Future) Winding Temperature very high - Trip 409 71 ST Station Transformer (Future) Low Oil Level - Alarm 410 63 PST Station Transformer (Future) Pressure Relief Device operated - Trip 411 51G1 Station Transformer (Future) Neutral Ground fault protection-1 operated 412 51G2 Station Transformer (Future) Neutral Ground fault protection-2 operated


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SL.No. Tag No. List of Digital Signals for SOER Remarks413 87REF LV Station Transformer (Future) REF protection operated 414 50/51 Station Transformer (Future) HV BKR INST/Inverse Time Over current protection operated415 50N/51N Station Transformer (Future) HV BKR INST/Inverse Time Overcurrent Ground fault protection operated416 87T T403 Station Transformer (Future) Differential Protection operated 417 2/50 BF Station Transformer (Future) HV side Breaker failure protection Timer operated -I stage Alarm 418 50 BF Station Transformer (Future) HV side Breaker failure relay operated -II stage419 86-1 Station Transformer (Future) Lockout relay-1 operated 420 86-2 Station Transformer (Future) Lockout relay-2 operated 421 86-3 Station Transformer (Future) Lockout relay-3 operated 422 74/86-1 Station Transformer (Future) Lockout relay-1 supervision relay operated 423 74/86-2 Station Transformer (Future) Lockout relay-2 supervision relay operated 424 74/86-3 Station Transformer (Future) Lockout relay-3 supervision relay operated 425 74 TC-1 Station Transformer (Future) HV BKRTrip Coil-1 Supervision relay operated 426 74 TC-2 Station Transformer (Future) HV BKRTrip Coil-2 Supervision relay operated 427 86-1 Station Transformer (Future) HV BKR Lockout relay -1 operated428 86-2 Station Transformer (Future) HV BKR Lockout relay -2 operated429 74/86-1 Station Transformer (Future) HV BKR Lockout relay-1 supervision relay operated 430 74/86-2 Station Transformer (Future) HV BKR Lockout relay-2 supervision relay operated 431 50/51 Station Transformer (Future) LV BKR Over current protection operated 432 86 Station Transformer (Future) LV BKR Lockout relay operated 433 74/86 Station Transformer (Future) LV BKR Lockout relay supervision relay operated 434 74 TC-1 Station Transformer (Future) LV BKR tripcoil-1 supervision operated 435 74 TC-2 Station Transformer (Future) LV BKR tripcoil-2 supervision operated

R 4.16kV Switchgear436 87 B1 4.16kV Switchgear Bus Section-1 Busbar protection operated 437 87 B2 4.16kV Switchgear Bus Section-2 Busbar protection operated 438 51 4.16kV Bus Section breaker Inverse time over current protection operated 439 51N 4.16kV Bus Section breaker Ground fault protection operated 440 86 A205 4.16kV Bus section breaker Lockout relay operated441 74/86 4.16kV Bus section breaker Lockout supervision relay operated442 74 DC 4.16kV Bus section breaker DC supply failure relay operated.


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SL.No. Tag No. List of Digital Signals for SOER Remarks443 74 TC-1 4.16kV Bus Section breaker trip coil-1 supervision relay operated444 74 TC-2 4.16kV Bus Section breaker trip coil-2 supervision relay operated

445 STM GTG-7 Starting motor protection relay operated 446 50M/51M GTG-7 starting motor feeder Overcurrent protection operated 447 50G GTG-7 starting motor feeder CBCT fault protection operated 448 86M GTG-7 starting motor feeder breaker lockout relay operated449 74 TC-1 GTG-7 starting motor feeder breaker trip coil-1supervision relay operated450 74 TC-2 GTG-7 starting motor feeder breaker trip coil-2 supervision relay operated451 74/86 GTG-7 starting motor feeder breaker lockout relay supervision relay operated452 49-1B GTG-7 starting motor bearing temperature high alarm453 49-2B GTG-7 starting motor bearing temperature very high trip454 49A GTG-7 starting motor cooler failure455 WTI A GTG-7 starting motor winding temperature high alarm456 WTI TRIP GTG-7 starting motor winding temperature very high trip

457 STM GTG-8 Starting motor protection relay operated 458 50M/51M GTG-8 starting motor feeder Overcurrent protection operated 459 50G GTG-8 starting motor feeder CBCT fault protection operated 460 86M GTG-8 starting motor feeder breaker lockout relay operated461 74 TC-1 GTG-8 starting motor feeder breaker trip coil-1supervision relay operated462 74 TC-2 GTG-8 starting motor feeder breaker trip coil-2 supervision relay operated463 74/86 GTG-8 starting motor feeder breaker lockout relay supervision relay operated464 49-1B GTG-8 starting motor bearing temperature high alarm465 49-2B GTG-8 starting motor bearing temperature very high trip466 49A GTG-8 starting motor cooler failure467 WTI A GTG-8 starting motor winding temperature high alarm468 WTI TRIP GTG-8 starting motor winding temperature very high trip

469 STM Future GTG Starting motor protection relay operated


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SL.No. Tag No. List of Digital Signals for SOER Remarks470 50M/51M Future GTG starting motor feeder Overcurrent protection operated 471 50G Future GTG starting motor feeder CBCT fault protection operated 472 86M Future GTG starting motor feeder breaker lockout relay operated473 74 TC-1 Future GTG starting motor feeder breaker trip coil-1supervision relay operated474 74 TC-2 Future GTG starting motor feeder breaker trip coil-2 supervision relay operated475 74/86 Future GTG starting motor feeder breaker lockout relay supervision relay operated476 49-1B Future GTG starting motor bearing temperature high alarm477 49-2B Future GTG starting motor bearing temperature very high trip478 49A Future GTG starting motor cooler failure479 WTI A Future GTG starting motor winding temperature high alarm480 WTI TRIP Future GTG starting motor winding temperature very high trip

S 480V Station Switchgear481 51 480V Bus Section breaker Inverse time over current protection operated482 86 A103 480V Bus section breaker Lockout relay operated 483 74/86 480V Bus section breaker Lockout relay Supervision relay operated 484 74 DC 480V Bus section breaker DC supply failure relay operated 485 74 TC 480V Bus Section breaker trip circuit supervision relay operated

T GENERATOR SWITCHGEAR486 94GB1 Generator breaker alarm (grouped alarm)487 94GB2 Generator breaker fault (grouped fault)488 94LB1 Line breaker alarm (grouped alarm)489 94LB2 Line breaker fault (grouped fault)

U EXCITATION490 64F Field ground fault491 94EX-1 Exciter trip output relay

V MISCELLANEOUS492 74GT/52GT Gas Turbine fault inducing generator trip


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SL.No. Tag No. List of Digital Signals for SOER Remarks493 98(VT-2) Voltage Transformer -2 fuse fail494 98(VT-4) Voltage Transformer -4 fuse fail495 NGT alarm NGT Over heating alarm496 NGT trip NGT Over heating trip

W OTHER ALARMS497 Bearing Vibration498 Bearing Oil Temp.High499 Negative Sequence Current500 Generator Overvoltage

X STATOR COOLING WATER SYSTEM501 Inlet Temp.High502 Inlet Flow low503 Inlet Pressure Low504 Liquid Header Outlet Temp High505 Bulk water Outlet Temp.High506 Conn.Ring Temp.High507 Conn.Ring Flow Low508 HV Bushing Outlet Temp.High509 HV Bushing Flow Low510 Main Filter Diff.Pressure High511 Conductivity High512 Tank Level High/Low513 Reservce Pump running514 Runback Initiated


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NOTE : 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

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SOER Input Signals for Arar_rev1