BB PROTECTION TRIP TRANSFER

If any problem in one bus the BB protection relay will trip the CB's in fulty Bus and also Bus coupler and Bus section breakers.

If any problem in opening of Bus coupler or bus section breakers the after 100ms (ABB -REB500) & 250 ms ( Siemens) the relay will transfer the Trip to other buses.

This time delay need for other BF & PD scheme also.

230kV RATED SF6 GAS PRESSURE

Normal condition ( At 20 dec Tem)
CB - 0.630 Mpa
VT - 0.630 Mpa
OTHERS ( ES, DS, GIB ) - 0.550 Mpa
Pressure Alarams in density Detector
Stage -I Gas Leakage Alaram
CB - 0.605 Mpa
VT - 0.605 Mpa
OTHERS ( ES, DS, GIB ) - 0.495 Mpa
Stage -II Gas Leakage Alaram
CB - 0.560Mpa
VT - 0.560 Mpa
OTHERS ( ES, DS, GIB ) - 0.450 Mpa
High pressure Alaram
OTHERS ( ES, DS, GIB ) - 0.620 Mpa

UNDER FREQUENCY TRIP TO BF INITIATION

Under frequency trip will not given to BF initiation . Because the BF relay current setting will be full 1 Amps and during under frequency trip condition there is no changes in normal current. If U/F trip given to BF it will not operate.

RED 670 MASTER & SLEVE

Both side RED 670 Differential relay set as the slave and both side Converter for distance communication set as the master.

VIDEO GRAPHIC ABB

To Configuration the video graphic ( power factor meter ) switch on the configuration nab available inside the meter.