reactor protection
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REACTOR PROTECTIONPREPARED BY
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
gk_aptransco@yahoo.co.in, Mobile:9440336984
MAIN-1 & MAIN-2PROTECTION FORSHUNT REACTOR
ADOPTED IN ONE AND HALF
CIRCUIT BREAKER SCHEME
PREPARED BYGOPALA KRISHNA PALEPU
ADE/MRT(PROTECTION)
BASICS OF SHUNT REACTOR1. TYPES OF REACTORS :
A. BASED ON REACTOR CONNECTIONi. SHUNT REACTOR. ii. SERIES REACTOR.B. BASED ON REACTOR LOCATIONi. BUS REACTOR ii. LINE REACTORC. BASED ON CONTROLi. 3-PH OIL IMMERSED REACTOR WITH GAPPED IRON CORE. ii. THYRISTOR CONTROLLED REACTOR (STATIC VAR COMPENSATOR)(APTRANSCO UTILISING SHUNT REACTORS FOR BUS & LINE IN 400KV NETWORK)
2. NEED OF SHUNT REACTOR:A. LINE REACTORSHUNT REACTORS ARE USED IN ORDER TO COMPENSATE FOR THE CAPACITIVE SHUNT REACTANCE OF TRANSMISSION LINES. THE REACTOR IS CONNECTED PARALLEL TO THE LINE. THE LOCATION OF REACTOR IS OUT GOING SIDE OF LINE i.e AFTER CIRCUIT BREAKER. LENGTH OF LINE IS MORE THERE MAY BE VOLTAGE IS RAISING DUE TO FARANTI EFFECT(CAPACITANCE) DURING CHARGING. IN CASE OF ZONE-2 (OPEN JUMPER) FAULT, THE FAULT CLEARED BY REMOTE END IS FAST, BUT THIS END IT WILL TAKE TIME DELAY DUE TO ZONE-2. DURING THIS TIME, VOLTAGE MAY RAISING. SO, LINE REACTOR IS USED FOR CONTROLLING THE SWITCHING OVER VOLTAGES AND SAFEGUARD THE OPERATING EQUIPMENT. NORMALLY IT IS ALWAYS IN SERVICE. NORMALLY BOTH ENDS LINE REACTORS ARE PROVIDED. THE ELECTRICAL INTERLOCK IS PROVIDED THAT IF REACTOR ISOLATOR CLOSSED POSITION ONLY WILL GIVE PERMIT TO CLOSE THE LINE ISOLATOR. SIMILARLY FOR OPENING REACTOR ISOLATOR THE LINE ISOLATOR SHOULD BE IN OPEN POSITION. NEUTRAL REACTOR CONNECTED BETWEEN THE STAR POINT OF EHV SHUNT REACTOR AND THE GROUND, LIMITS THE SECONDARY ARC CURRENT TO A LOW VALUE OF AROUND 10 AMPS TYPICALLY FOR 400KV SYSTEM TO ENSURE COMPLETE DE-IONISATION OF ARC PATH WHEN EHV SYSTEM DEVELOPS A SINGLE LINE TO GROUND FAULT. ARC EXTINCTION DURING LINE SINGLE-PHASE AUTORECLOSE DEAD TIME IS ASSISTED BY THIS NEUTRAL REACTOR.
B. BUS REACTORTHE REACTOR IS CONNECTED PARALLEL TO THE BUS i.e LIKE A FEEDER/LINE. DURING LIGHTLY LOADED CONDITIONS THERE MAY BE POSSIBULITY OF RAISING BUS VOLTAGES. FOR SAFEGUARD THE OPERATING EQUIPMENT BUS REACTORSARE UTILISING. NORMALLY IT IS NOT IN SERVICE. WHENEVER THE VOLTAGE RAISES TO 4%TO 5% MORE THAN THE RATED VOLTAGE THIS MAY BE KEPT IN SERVICE AND 2% TO 3% LESS THAN THE RATED VOLTAGE THIS MAY BE KEPT OUT OF SERVICE.
3. SELECTION OF REACTORA. LINE REACTORNORMALLY LINE REACTORS ARE PROVIDED IF THE LINE IS MORE OR EQUAL TO 250KM. IN APTRANSCO NETWORK MAXIMUM LENTH OF LINE IS 350KM. AS PER SYSTEM STUDIES RECOMANDATIONS IF LINE LENGTH IS 250KM TO 300KM 50MVAR REACTOR IS TO BE USED. IF MORE THAN 300KM 63MVAR REACTOR IS TO BE USED.B. BUS REACTOR NORMALLY BUS REACTORS ARE PROVIDED IF THE SUBSTATION BUS VOLTAGE IS RAISING 5% MORE THAN THE RATED VOLTAGE DURING LIGHTLY LOADED CONDITION. BASED ON THE SYSTEM STUDIES RECOMANDATIONS BUS REACTORS ARE TO BE PROVIDED. CALCULATIONS ARE REQUIRED FOR PROVIDING BUS REACTOR. IN THIS THERE IS NO STANDARDISATION.
4. LOCATION OF REACTORS WITH CAPACITY IN APTRANSCOA. LINE REACTOR1. 400KV KALAPAKA-KHAMMAM 1 AT BOTH ENDS – 63MVAR 2. 400KV KALAPAKA-KHAMMAM 2 AT BOTH ENDS – 63MVARB. BUS REACTOR1. 400KV KALAPAKA SS – 2 X 50 MVAR2. 400KV NUNNA SS(PGCIL BAYS) – 1 x 63 MVAR
5. PURPOSE OF SHUNT REACTOR PROTECTIONTHE PURPOSE OF THE PROTECTION RELAYING IS TO DISCONNECT THE REACTOR AND LIMIT DAMAGE IN CASE OF INTERNAL SHORT CIRCUITS, EARTH FAULTS, INTERTURN FAULTS AND OVER VOLTAGE OR OVER LOAD.THE REACTOR FORMS CERTAIN IMPEDENCE FOR RATED FREQUENCY, AND AS IT IS SHUNT CONNECTED, AS OVER LOAD MAY BE CAUSED BY OVER VOLTAGE OR HARMONICS IN VOLTAGE AND CURRENT.
6. PROTECTION DEVICES INBUILT OR MOUNTED ON REACTORA. OIL IMMERSED REACTOR USUALLY HAVE A GAS DETECTOR AND OIL SURGE. DETECTOR (BUCHHOLZ ALARAM & TRIP DEVICES), WHICH ARE EXCELLENT FOR DETECTING INTERNAL FAULTS.B. TEMPARATURE MONITORS FOR OIL & WINDING PROVIDE GOOD OVER LOAD PROTECTION.C. PRESSURE RELIEF DEVICE IS PROVIDED TO SAFE GUARD THE REACTOR FROM HIGH PRESURES.
7. REACTOR DIFFERENTIAL PROTECTIONIT IS WIDELY USED AS INSTANTANEOUS PROTECTION FOR SHORT CIRCUIT FAULTS WITH IN THE DIFFERENTIAL ZONE. THIS IS TREATED AS MAIN-1 PROT FOR REACTOR.IT CAN BE OF HIGH IMPEDENCE TYPE OR OF A SENSITIVE CURRENT STABILISED TYPE. HIGH IMPEDENCE DIFFERENTIAL PROTECTION RELAYS REQUIRE AN EQUAL CT TURNS RATIO ON THE PHASE AND NEUTRAL SIDE. SENSITIVITY IS 5% OF NOMINAL REACTOR CT CURRENT.
8. BACK-UP PROTECTIONA VARIETY OF RELAYS ARE AVAILABLE.A. OVER CURRENT & EARTH FAULT PROTECTION. ( 50, 50N, 51, 51N, 67, 67N - ANY COMBINATION OF THESE)B. UNDER IMPEDENCE / DISTANCE ( Z<)(21R).C. NEUTRAL DISPLACEMENT PROTECTION (Un>).
9. RESTRICTED EARTH FAULT PROTECTIONIF, FOR SOME REASON, A SENSITIVE DIFFERENTIAL PROTECTION NOT CHOOSEN A RESTRICTED EARTH FAULT PROTECTION CAN BE UTILISED.
SHUNT REACTOR (BUS & LINE) (ONE AND HALF CIRCUIT BREAKER SYSTEM )
LINE 1
1-89
1-89A
1-52CB
1-CT3
3
3-89
3-89A
3-52CB
3-CT3
2-52CB
2-CT
2-89A 2-89B
1-89L
BUS-1 BUS-2
P1
P1
P1
P2 P2
P2
U UU
LINESHUNT
REACTOR
1-89R
U UU
BUSSHUNT
REACTOR
.3-89R
U UUU
.
IL
INTER LOCK FACILITY:WHEN 1-89R CLOSES ONLY
PERMIT TO CLOSE 1-89L AND1-89L OPENS ONLY
PERMIT TO OPEN 1-89R.
IL
1-PH NEUTRAL GROUNDING REACTOR
REACTOR BUSHING CT INFORMATIONCAPACITY OF 400KV REACTORS : 50, 63, 80, 125 MVAR
NGRSHUNT REACTORITEMSr
NOEARTH SIDELINE SIDESTAR / NEUTRAL SIDE400KV / LINE SIDE
CORE-2CORE-1CORE-4CORE -3CORE-2CORE-1CORE-5CORE-4CORE-3CORE -2CORE-1
200/1200/1200/1200/1WTI200/12000-1000-500/1
2000-1000-500/1
200/1200/1200/1RATIO1
NEUTRAN BUSHING CT : CORE-1 : BEFORE STAR FORMATION IN RYB PHASES
64 RREF1/2
64 RREF2
64 RREF1
87 RDIFFMET
FOR 21L1 /TEED-2 /
BBC
FOR 21L2 /TEED-1 /
BBM21 R IMP
64 R REF1
87 RDIFFPURPOSE5
PSPSPSPSPSPSPSPSPSCLASS OF ACURACY4
1 OHM1 OHM1 OHM1 OHM10 – 5 – 2.5 OHM
10 – 5 –2.5
OHM1 OHM1 OHM1 OHMRCT IN OHMS3
200V200V200V200V
Parameters of WTI CT for each winding shall be provided by the contractor
1.0 CLAND
BURDEN 10 VA
1000-500-250V
1000-500-250V
200V200V200VVKNEE FOR PS
& VA FOR MET
2
SHUNT REACTOR PROTECTION
400KV SIDE
21R – 3Ph, REACTOR BACKUP IMPEDANCE RELAY OF SUITABLY SHAPED CHARECRESTICS EITHER SINGLE /
DOUBLE ZONE TYPE.CORE-3
87 BBC/BB-221L2(M_CT+T_CT – R_CT)
87 TEED-2(M_CT, T_CT, R_CT)
21L2(M_CT+T_CT–R_CT)
CORE-4
87 BBM/BB-121L1(M_CT+T_CT – R_CT)
87 TEED-1(M_CT, T_CT, R_CT)
21L1(M_CT+T_CT–R_CT)
CORE-5
64R - REACTOR RESTRICTED EARTH FAULT PROTECTION OF1-POLE HIGH IMPEDANCE TYPE.(REF1)CORE-2
87R – 3Ph, 2Wdg REACTOR DIFFERENTIAL RELAY EITHER LOW or HIGH IMPEDANCE TYPE.CORE-1
BUSLINEBUSLINE
DOUBLE BUS & TRANSFER BUS SYSTEM
ONE & HALF BREAKER SYSTEMCORES
M_CT: Main CT, T_CT: Tie CT, R_CT: Reactor CT
SHUNT REACTOR PROTECTION
NEUTRAL GROUNDING REACTOR SIDE- -64 REF2- -64 REF1CORE-1
STAR / NEUTRAL SIDE
87R – 3Ph, 2Wdg REACTOR DIFFERENTIAL RELAY EITHER LOW / HIGH IMPEDANCE TYPE.CORE-3
64R - REACTOR RESTRICTED EARTH FAULT PROTECTION OF1-POLE HIGH IMPEDANCE TYPE .(REF1)CORE-4
- -64 REF 1 / 2- -64 REF1CORE-2
WINDING TEMPARETURE OF REACTORCORE-2METERING OF REACTORCORE-1
BUSLINEBUSLINE
DOUBLE BUS & TRANSFER BUS SYSTEM
ONE & HALF BREAKER SYSTEMCORES
U UU
LINESHUNT
REACTOR
.1-PH NEUTRAL
GROUNDING REACTOR
3
3
3
3
3
3
3
3
U UU
3
3
3
3
3
3
3
3
3
U UU
3
3
3
3
3
3
3
3
U UU
3
3CORE -1
CORE -2
CORE -3
CORE -4
CORE -5
CORE -1
CORE -2
CORE -3
CORE -4
CORE -1
CORE -2
REA
CTO
R B
USH
ING
CT
INFO
RM
ATI
ON
U UU
BUSSHUNT
REACTOR
.
3
3
3
3
3
3
3
3
U UU
3
3
3
3
3
3
3
3
3
U UU
3
3
3
3
3
3
3
3
CORE -1
CORE -2
CORE -3
CORE -4
CORE -5
CORE -1
CORE -2
CORE -3
CORE -4
REA
CTO
R B
USH
ING
CT
INFO
RM
ATI
ON
ONE & HALF BREAKER LINE & BUS SHUNT REACTOR PROTECTION SCHEME87BB1
87BB2
CVT
CVT
VBB1
VBB2
79
25
79
25
79
25VBB2
BF
BFVL2 / VL1
OR VBB1
VL1 / VL2
OR VBB2
VBB1
FEEDER1 / LINE1
87L 21M2 CVT VL1
BF
VL1
BUSBAR-1
BUSBAR-2
TEED-1
TEED-2PROTECTION OF BUS REACTOR
21M1 VL1
VL1 / VBB1
VL2 / VBB2
FOR REACTOR PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .
UU U UUU
87R
64R
OR
21R
UUU
87R
64R
VL1/V
BB1/V
BB2
VBB1/
VBB2
21R
LINE/BUS REACTOR DIFFERENTIAL PROTECTION (LOW IMPEDANCE DIFFERENTIAL PROTECTION)
3 3 3
R-CT
HV BUSHING
CORE-1CTR: 200/1A
CLASS: PS
1S2 1S2 1S2
1S11S1 1S1
P2P2P2 CT MB3 3 3
R-CT
STAR BUSHING
CORE-3CTR: 200/1A
CLASS: PS
3S1 3S1 3S1
3S23S2 3S2
P2P2P2
CT MB
C
E
DISPLAY
ACTIVE START TRIP
RET 670
NORMALLYLOW / HIGH IMPEDENCE DIFFERENTIAL RELAY IS
USED FOR BUS / LINE REACTOR
DIFFERENTIAL PROTECTION
IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR & P1 IS TOWARDS REACTOR
C
E
DISPLAY
ACTIVE START TRIP
RET 6703 3 3
3 3 3R-CT HV
BUSHING CT
CORE-1CTR: 200/1A
CLASS: PS
R-CT STAR
BUSHING CT
CORE-3CTR: 200/1A
CLASS: PS
P2P2P2
P2P2P2
P1P1P1
P1P1P1
1S21S21S2
3S23S23S2
1S11S11S1
3S13S13S1
LINE/BUS REACTOR DIFFERENTIAL PROTECTION (HIGH IMPEDANCE DIFFERENTIAL PROTECTION)
IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR& P1 IS TOWARDS REACTOR
NORMALLYLOW / HIGH IMPEDENCE DIFFERENTIAL RELAY IS
USED FOR BUS / LINE REACTOR
DIFFERENTIAL PROTECTION
C
E
DISPLAY
ACTIVE START TRIP
RET 6703 3 3
3 3 3P2P2P2
P2P2P2
P1P1P1
P1P1P1
2S22S22S2
4S24S24S2
4S14S14S1
2S12S12S1
LINE/BUS REACTOR REF PROTECTION (NGR IS NOT AVAIALBLE)
R-CT HV
BUSHING CT
CORE-2CTR: 200/1A
CLASS: PS
R-CT STAR
BUSHING CT
CORE-4CTR: 200/1A
CLASS: PS
IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR& P1 IS TOWARDS REACTOR
NORMALLYHIGH IMPEDENCE
VOLTAGE/CURRENT OPERATED SINGLE
POLE RELAY IS USED FOR BUS / LINE
REACTOR RESTRICTED EARTH FAULT PROTECTION.PRESENTLY NUMERICAL
DIFFERENTIAL RELAYS HAVING IN BUILT
FUNCTION OF 2 REF OR 2 SEF PROTECTIONS.
3 3 3
3 3 3P2P2P2
P2P2P2
P1P1P1
P1P1P1
2S22S22S2
2S22S22S2
2S12S12S1
2S12S12S1
LINE REACTOR REF PROTECTION (NGR IS AVAIALBLE)
R-CT HV
BUSHING CT
CORE-2CTR: 200/1A
CLASS: PS
NGR-CT EARTH
BUSHING CT
CORE-2CTR: 200/1A
CLASS: PS
IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR& P1 IS TOWARDS REACTOR
C
E
DISPLAY
ACTIVE START TRIP
RET 670 NORMALLYHIGH IMPEDENCE
VOLTAGE/CURRENT OPERATED SINGLE
POLE RELAY IS USED FOR BUS / LINE
REACTOR RESTRICTED EARTH FAULT PROTECTION.PRESENTLY NUMERICAL
DIFFERENTIAL RELAYS HAVING IN BUILT
FUNCTION OF 2 REF OR 2 SEF PROTECTIONS.
3 3 3
3 3 3P2P2P2
P2P2P2
P1P1P1
P1P1P1
2S22S22S2
4S24S24S2
4S14S14S1
2S12S12S1
LINE REACTOR 2 NOs REF PROTECTIONS (NGR IS AVAIALBLE)
R-CT HV
BUSHING CT
CORE-2CTR: 200/1A
CLASS: PS
R-CT STAR
BUSHING CT
CORE-4CTR: 200/1A
CLASS: PS
3 3 31S2 1S2 1S2
1S11S1 1S1
P1P1P1
CT MB
C
E
DISPLAY
ACTIVE START TRIP
RET 670
P2P2P2
3 3 32S1 2S1 2S1
2S22S2 2S2
P2P2P2
CT MBP1P1P1
NORMALLYHIGH IMPEDENCE
VOLTAGE/CURRENT OPERATED SINGLE POLE RELAY IS USED
FOR BUS / LINE REACTOR RESTRICTED EARTH FAULT
PROTECTION.PRESENTLY NUMERICAL
DIFFERENTIAL RELAYS HAVING IN BUILT FUNCTION OF 2 REF
OR 2 SEF PROTECTIONS.
NGR-CT BUSHING CTCORE - 1 & 2
CTR: 200/1A
CLASS: PS
C
E
DISPLAY
ACTIVE START TRIP
REL 6703 3 3
IR3 / A311IY3 / A331IB3 / A351
IN3 / A3713S2 3S2 3S2
3S13S1 3S1
P2P2P2 CT MBVR11 / E111VY11 / E131VB11 / E151VN11 / E171
LINE/BUS REACTOR B/U IMPEDANCE PROTECTION
R-CT HV
BUSHING CT
CORE-3CTR: 200/1A
CLASS: PS CVT SELECTION
BUS-1 CVT / BUS-2 CVT /
LINE CVT
CORE-1VA : 200
CLASS: 3P
LINE REACTOR PROTECTION FOR LINE (MAIN-1 PROTECTION)
C
E
DISPLAY
ACTIVE START TRIP
REL 5213 3 3
3 3 3
IR5 / A511IY5 / A531IB5 / A551
IN5 / A571
1-CT
CORE-5CTR: 2000-1000-500/1A
CLASS: PS
2-BCT
CORE-5CTR: 2000-1000-500/1A
CLASS: PS
5S4 5S4 5S4
5S25S2 5S2
P2P2P2 CT MB
P2P2P2
5S4 5S4 5S4
5S25S2 5S2
VR11 / E111VY11 / E131VB11 / E151VN11 / E171
1-CVT
CORE – 1
200VA
CLASS: 3P
3 3 3LR-CT 400KV
CORE-5CTR: 2000-1000-500/1A
CLASS: PS
P1P1P1
5S2 5S2 5S2
5S45S4 5S4
LINE REACTOR PROTECTION FOR LINE(MAIN-2 PROTECTION)
C
E
DISPLAY
ACTIVE START TRIP
REL 3163 3 3
3 3 3
IR4 / A411IY4 / A431IB4 / A451
IN4 / A471
1-CT
CORE-4CTR: 2000-1000-500/1A
CLASS: PS
2-BCT
CORE-4CTR: 2000-1000-500/1A
CLASS: PS
4S4 4S4 4S4
4S24S2 4S2
P2P2P2 CT MB
P2P2P2
4S4 4S4 4S4
4S24S2 4S2
VR21 / E211VY21 / E231VB21 / E251VN21 / E271
1-CVT
CORE – 2
200VA
CLASS: 3P
3 3 3LR-CT 400KV
CORE-4CTR: 2000-1000-500/1A
CLASS: PS
P1P1P1
4S2 4S2 4S2
4S44S4 4S4
BUS REACTOR TEED-1 PROTECTION{BAY3&2}
C
E
DISPLAY
ACTIVE START TRIP
RET 670
3 3 3
3 3 33-CT
CORE-5CTR: 2000-1000-500/1A
CLASS: PS
BR-LCT
CORE-5CTR: 2000-1000-500/1A
CLASS: PS
P2P2P2
P1P1P1
3 3 32-CT
CORE-1CTR: 2000-1000-500/1A
CLASS: PS
P1P1P1P2P2P2
P1P1P1
P2P2P2
5S4 5S4 5S4
5S25S2 5S2
1S4 1S4 1S4
1S21S2 1S2
4S4 4S4 4S4
4S24S2 4S2 IT WORKS ON CIRCULATING CURRENT PRINCIPLE AND IT IS HIGH IMPEDENCE DIFFERENTIAL RELAY. TEED-1 PROTECTION FOR BAY 2&3 AND THE FOLLOWING CTs & CORES ARE USED 3-CT(CORE-5), 2-CT(CORE-1) & BR-CT (CORE-5) ARE STARRED AND CONNECTED TO TEED-1 PROTECTION
IR5IY5IB5
IN5
IR5IY5IB5
IN5
IR1IY1IB1
IN1
BUS REACTOR TEED-2 PROTECTION{BAY3&2}
3 3 3
3 3 3
3-CT
CORE-4CTR: 2000-1000-500/1A
CLASS: PS
BR-CT
CORE-4CTR: 2000-1000-500/1A
CLASS: PS
4S4 4S4 4S4
4S24S2 4S2
P2P2P2 CT MB
CT MBP2P2P2
4S2 4S2 4S2
4S44S4 4S4
3 3 3
2-CT
CORE-2CTR: 2000-1000-500/1A
CLASS: PS
2S2 2S2 2S2
2S42S4 2S4
P2P2P2CT MB
C
E
DISPLAY
ACTIVE START TRIP
RET 670
RA
ICA
LBB
/BFR
RA
ICA
LBB
/BFR
IT WORKS ON KIRCHOFF’S CURRENT PRINCIPLE & IT IS PERCENTAGE BIASED LOW IMPEDENCE DIFFERENTIAL RELAY. TEED-2 PROTECTION FOR BAY 2&3 IS THE FOLLOWING CTs & CORES ARE USED. 3-CT(CORE-4), 2-CT(CORE-2) & BR-CT (CORE-4) ARE CONNECTED TO TEED-2 PROTECTION.
OVER EXCITATION/FLUX RELAY{FOR LINE & BUS REACTORS}
RATUB
V/F RELAYLINE
RATUB
V/F RELAYBUS
CVT SELECTION
BUS-1 CVT /
BUS-2 CVT /
LINE CVT
CORE-1VA : 200
CLASS: 3P
VOLTAGE
SELECTION
BUS-1 PT /
BUS-2 PT
CORE-1VA : 200
CLASS: 3P
3 3 3
IR2 / D211IY2 / D231IB2 / D251
IN2 / D271
R-CT STAR
BUSHING CT
CORE-2CTR: 200/1A
CLASS: 0.2
2S2 2S2 2S2
2S12S1 2S1
P2P2P2 CT MB
VR31 / E311VY31 / E331VB31 / E351
VN31 / E371
BASED ON SELECTION
LINE CVT / BUS-1 CVT / BUS-2 CVT
CORE – 3
100VA
CLASS: 0.2
REACTOR MULTI FUNCTION PANEL METERING
CARRIER INTERTRIPPING OF LINE SHUNT REACTORLINE SHUNT REACTOR PROTECTION TRIPPINGS WILL BE USED AS DIRECT TRIPPINGS OF LINE IN ADDITION TO OTHER TRIPPINGS. BUS SHUNT REACTOR NEED NOT REQUIRE CARRIER INTER TRIPPING FACILITY.
87R REACTOR DIFFERENTIAL RELAY
21R REACTOR IMPEDENCE RELAY
64R RESTRICTED EARTH FAULT RELAY
ABBNSD 50
DC +VE FROM PANEL
G4AD V9LC 2
DC –VE FROM PANELG4AD V9LC 1
LINE PROTECTION COUPLER PANEL-1
ABBNSD 50
DC +VE FROM PANEL
G4AD V9LC 2
DC –VE FROM PANELG4AD V9LC 1
LINE PROTECTION COUPLER PANEL-2
RET 670
REL 670
RET 670REACTORS INTERNAL FAULTS
87R REACTOR DIFFERENTIAL RELAY
21R REACTOR IMPEDENCE RELAY
64R RESTRICTED EARTH FAULT RELAY
REACTORS INTERNAL FAULTS
GROUP-1/A TRIPPINGS
GROUP-2/B TRIPPINGS
RET 670
REL 670
RET 670
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