Substation Protection Flashcards
Types of 132/11 kV S/S communication
RTU
BCU
BCPU
BMP
What is IBT Protection
OC RELAY
EF RELAY
REF
BUCHHOLZ
SBEF
PRV
OIL TEMP.
WINDING TEMP.
DIFFERENTIAL
33kV feeder Protection
PWP/Line Differential
Guard relay
Backup: OC and EF
Guard OC and EF
33 kV busbar protection
Discriminating Zone
Check Zone
OC
EF
33kV Capacitor protection
Over voltage
Under voltage
EF
OC
Out of balance
Earthing Transformer Protection
OC
EF
REF
Buchholz
PRV
Oil Temp.
Winding Temp.
IDT Protection (Old)
OC
EF
REF
BUCHHOLZ
SBEF
PRV
OIL TEMP.
WINDING TEMP.
DIFFERENTIAL
11 kV Feeder protection (Old)
OC
EF
SEF
11 kV capacitor protection (Old)
OV
UV
EF
OC
Out of balance
11 kV busbar protection (old)
Discriminating zone
Check zone
OC
EF
11 kV feeder main protection (New/BMP)
OC
EF
BF
UFLS
BB PROTECTION
11 kV feeder back up protection (New/BMP)
OC
EF
BF
Negative sequence
IDT Main 1 Protection (New/BMP)
Differential
HV: REF, BEF, SBEF
LV REF, BEF, SBEF
BUCHHOLZ(IDT/ET)
Oil Temp. (IDT/ET)
Mechanical Alarm (IDT/ET)
IDT Main 2 Protection (New/BMP)
Differential
HV: REF, CBF, SBEF, OC
LV: CBF, SBEF
PRV (IDT/ET)
Winding temp. (IDT/ET)
Mechanical alarm (IDT/ET)
C&I DC fail
11 kV protection (new/BMP)
Main:
- OC/EF stage 1 & 2 trip
- BB protection trip
- BF trip
Back up:
- OC
- EF
11 kV capacitor protection (BMP)
OC, EF, UFLS, BB protection
CPB relay: Unbalance, overload, fire protection
11 kV busbar protection (New/BMP)
- High impedance Discriminating zone
- Low Impedance check zone
33/11-6.6 DT protection
Primary & Secondary side: OC, REF
Secondary only: EF
PRV
BUCHHOLZ
OIL TEMP
WINDING TEMP
33 kV feeder protection (Cable circuit)
PWP
Guard relay
OC
EF
33 kV feeder protection (OHL)
OC
EF
33 kV BB protection
ARC protection (MG, Tamco, GEC, Alsthom, Energoinvest, ABB, Konkar, Siemens)
OC & EF (Bus section)
11-6.6 kV feeder protection
OC
EF
11-6.6 kV OHL
OC
EF
SEF
11 kV busbar protection
OC
Mechanical protection (VEM)
11-6.6/0.4 kV
HRC (for OC)
TLF (OC trip coil, EF trip coil)
CB with relay (OC & EF)
