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Presentation given to block-1 Senior Engineers
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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