Both Unit board Tripped

Both Unit board (11 kv) Tripped

What To Do?

1. DC EOP, SOP, TD-A/B EOP, DC Scanner Fan (& emergency Damper),DC Lights starts on Auto. If not Start Them. Ensure APH Air Motor Starting.
2. Main DG set starts on Auto, If not Manually start from Local and ensure closing of i/c breaker. IF Main DG Fails start standby DG set and close its breaker. DG Board is charged.
3. Ensure Vacuum Breaker is Open on Speed <2000 rpm
4. DC Jop starts at 510 rpm, Ensure Battery Chargers are charged from DG (Bus-coupler to be closed).
5. Start B(or 2) pumps AOP2,AC JOP, TD-A/B LOP-B , SOP(AS)-2,SOP(H2), AC Scanner fan.
6. Ensure Main Turbine, TD-A/B Barring v/v Opening( Or Open from Local)
7. Ensure H2 Pressure. IF Drops. Purge by Co2.
8. Isolate Seal steam manual v/vs of Main Turbine and TDBFP-A/B.
9.  Ensure all Extraction v/v are closed.

Restoration Dos :

1.    Normalize 400 KV Buses 
2.   Normalise 132 KV Buses, 
3.   Normalize 11KV UNIT Buses thru ST. 
4.   Normalise 3.3 kv Unit buses through UATs. 

4.    NORMALIZE LT SWITCHGEARS  USS, SSS, TMCC, BMCC, SERVICE BUILDING MCC, ESP MCC,  AND OFFSITE SWITCHGEARS

5.   SYNCHRONIZE UES BUS WITH USS USING SYNCHRONIZER AND THEN CLOSE THE TIE BREAKER (I/C FROM USS). 

6.    FOR DEAD BUS CHARGING OF UES BY I/C FROM USS PUT DG SELECTION SWITCH ON MANUAL.

7.   TRIP THE DG BREAKER AND THEN STOP DG SET.