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PROTECTION OF POWER SYSTEM PREPARED BY TRAINEE ENGINEER MUDDASIR MASOOD
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PROTECTION OF POWER SYSTEMPREPARED BY TRAINEE ENGINEER MUDDASIR MASOODWHAT DOES PROTECTION MEANSEVERY THING IN THIS WORLD NEEDS PROTECTION AGAINST THREATS SO DOES ELECTRICAL EQUIPMENTSINTERNAL THREATS

EXTERNAL THREATS

CRITICAL ELECTRICAL EQUIPMENTPOWER SYSTEMDAMAGEDTYPES OF ELECTRICAL THREATS/FAULTSSERIES FAULTSHUNT FAULTSPHASE TO PHASE SHORT CIRCUITPHASE TO GROUND FAULTOPEN CIRCUITTASK OF THE PROTECTION SYSTEM

PROTECT THE ELECTRICAL EQUIPMENT AGAINST UNESISSARY DAMAGE

PROTECT THE PERSONAL IN THE VICINITYOF THE ELECTRICAL FAULT

ENABLE CONTINUED SERVICE IN THE UNTROUBLED AREA OF THE NETWORK

PHILOSPHY OF THE PROTECTION SYSTEM

ABNORMAL BUT SECURE OPERATIONNORMAL NETWORK OPERATIONFAULT CONDITIONABNORMAL NETWORK OPERATIONREQUIREMENT OF THE PROTECTION SYSTEM

SPEEDYSELECTIVITYRELIABILITYSENSITIVITYSIMPLICITY

PROTECTION SCHEME FOR THE POWER SYSTEM

PROTECTION SYSTEM IS DIVIDED INTO ZONESPROTECTION ZONES ARE DECIDED BY THE LOCATION OF CTPRIMARY PROTECTIONBACKUP PROTECTIONGT-1

GENERATORCURRENT TRANSFORMERPOWER TRANSFORMERCIRCUIT BREAKER132KV BUSBAREARTH FAULT PROTECTIONDIFFERENTIAL PROTECTIONTYPICAL PROTECTION SCHEMEPROTECTION RELAY-2PROTECTION RELAY-1TRIPING MATRIXTRIP CIRCUITTRIP COIL-1TRIP COIL-2TRIPPING MECHANISMDC SUPPLYDC SUPPLY

BREAKER FAILURE SCHEMEG

MINTEGRATED POWER SYSTEMPROTECTIVE RELAYBREAKER FAILURETIME DELAY TRIP ALL PARALLEL CBTYPE OF EARTHING SYSTEMUNEARTHED NEUTRAL

LITTLE FAULT CURRENTEXTREME OVERVOLTAGE

DIRECTLY EARTHED

LARGE FAULT CURRENTNO OVERVOLTAGE

LESS FAULT CURRENTLESS OVERVOLTAGEINDUCTOR/ TRANSFORMER GROUNDING

GENERATOR PROTECTION

G

RDIFFERENTIAL PROTECTION100% STATOR EARTH FAULT80% STATOR EARTH FAULTNEGATIVE PHASE SEQUENCE PROTECTIONREVERSE POWER PROTECTIONUNDEREXCITATION PROTECTIONIMPEDENCE PROTECTIONVOLTAGE RISE PROTECTIONROTOR EARTH FAULT PROTECTIONUNIT STEPUP TRANSFORMER PROTECTIONGYY

GENERATOR TRANSFORMER DIFFERENTIAL PROTECTIONYYY

TRANSFORMER EARTH FAULT PROTECTIONBATBBT

RUNIT TRANSFORMER BUCHHOLZ TRIPPRESSURE RELIEF OLTC TRIPOIL TEMPERATURE TRIPWINDING TEMPERATURE TRIPPOWER TRANSFORMER OTHER PROTECTIONS

PROTECTION LOGIC ADOPTED AT BLOCK-1

PROTECTION RELAYTRIPPING MATRIXTRIP RELAYTRIP CIRCUITTRIP CIRCUIT SUPERVISIONTWO INDEPENDANT TRIP COILSTRIP SUPERVISORY CKTTRIP COMMAND REGISTERTRIP ANNUNCIATION+24

OPENING MECHANISM OF CBPOWER SUPPLY220 OR 24 VOLTTRIPPING MATRIX

ROTOR EARTH FAULT PROTECTIONREVERSE POWER PROTECTIONGENERATORDIFFERENTIALPROTECTIONVOLTAGE RISE PROTECTION80% EARTH FAULT PROTECTIONUNIT TRANSFORMER DIFFERENTIAL PROTECTIONREVERSE POWER PROTECTION WITH TIME DELAYFREQUENCY DROP PROTECTIONUNIT AUXILIARY TRANSFORMER DIFFERENTIAL PROTECTIONTRANSFORMER EARTH FAULT PROTECTIONFREQUENCY RISE100% EARTH FAULT PROTECTIONUNBALANCED LOAD PROTECTIONUNDEREXCITATION PROTECTIONUNDER EXCITATION PROTECTION WITH 2 STEPOVERCURRENT TIME PROTECTION EXCT. TRAFOUNIT TRANSFORMER BUCHOLZ OVERTEMP.SS TRANSFORMER BUCHOLZ OVERTEMP.OVERFLUXING PROTECTIONLOSS OF EXCITATION PROTECTIONEXCITATION TRANSFORMER BUCHOLZ TRIPSFC EARTH FAULTSFC FAILURESS TRAFO OVERCURRENTTIME PROTECTIONSYNC BREAKER-1SYNC BREAKER-2ST SERVICE SUPPLY BREAKEREMERGENCY TRIPEXCIT. BREAKERDE-EXCITATIONSFC BREAKERUNIT AUXILIARY CHANGEOVER

LOCAL INDICATIONREMOTE SIGNALRESETPOWER SUPPLY

CIRCUIT BREAKER

TRIP COILS

220VL+L-

GENERATOR DIFFERENTIAL PROTECTION 7TD43

G

RACTIFIERRACTIFIER

STABILIZING TRANSFORMERTRIPPING TRANSFORMER

TMSYNCH BREAKER-1DE-EXCITATION BREAKERSFC BREAKERUNIT AUX CHANGOVERST SERVICE SUPPLY BREAKEREMERGENCY TRIPSYNCH BREAKER-2GENERATOR DIFFERENTIAL PROTECTION

PROTECTION AGAINST PHASE TO PHASE FAULTPROTECTION AGAINST PHASE TO EARTH FAULTPROTECTION ZONE DEFINED BY THE LOCATION OF CTSINSENSITIVE TO INTERTURN FAULTSINOPERATIVE TO EXTERNAL FAULTSEARTH FAULT SENSITIVITY DEPEND UPON GROUNDING SYSTEM

GENERATOR DIFFERENTIAL PROTECTION

Us/UnUa/UnTRIPBLOCKPICKUP CHARACTERISTIC FOR THE SINGLE INFEED FAULT100% EARTH FAULT PROTECTION 7ue21

LIMIT VALUE SETTERTIMMERTRIP SIGNALCOMPARATOR

20 HZ FREQUENCY GENERATORRACTIFIER

CTSYNCH BREAKERDE-EXCITATIONSERVICE STATIONEMERGENCY TRIPSFCAUXILLARY CHANGEOVERTRIP MATRIXTRIP100% EARTH FAULT PROTECTION

EARTH FAULT PROTECTIONDETECTION OF THE EARTH FAULT AT ANY LOCATIONHIGHLY SENSITIVEEARTH FAUTL DUE TO INSULATION DAMAGESHORT CIRCUIT DUE TO THE PHASE WITH THE CORE

80% EARTH FAULT PROTECTION

VOLTAGE INPUT MODULE 7TM36VOLTAGE TRIGGER MODULE 7TU12TIMMER 7TT10PICKUPTRIP

ROTOR EARTH FAULT PROTECTION 7UR20UNGROUNDED FIELD WINDINGSINGLE EARTH FAULT CAUSE LITTLE CURRENTDOUBLE EARTH FAULT/ MAGNETIC UNBALANCEHIGH CURRENT AT THE FAULT LOCATION

EXCITATION SYSTEM

ELECTRICAL STRESS INCREASES

ROTOR EARTH FAULT CONT.

DETECT BEFORE IT EFFECTSCOUPLING RESISTER RvReRmRcLOW PASS FILTERWAIT FOR THE STEADY STATELIMIT VALUE GENERATORSET VALUEALARM