3.3 KV bus charging

3.3 KV bus charging from bus coupler/ Normal Incomer

A:    Bus charging from bus coupler: - (Only done from Electrical control panel at UCB)

1. Select 3.3 KV bus coupler breaker
2. Select I/C-A or I/C-B in trip selection (Select the incomer that we want to trip).
3. Put Key (Synch selection) in position “1 - check “.
4. Switch ON synchroscope by putting switch in position “2”.
5. If IN PHASE lamp (green LED) glows. Go to step-6. If OUT OF PHASE (RED LED) Glows
check for voltage/frequency difference & inform to EMD.
6. Close Circuit breaker (control switch position “2”). Bus coupler breaker will close &
incomer (which selected in trip selection) will trip.
7. Change over completed, Switch OFF synchroscope & put key in “0 – OFF” position.
8. Deselect bus coupler .
9. Reset all by pressing Control reset.

B: Bus charging from normal incomer :- (Only done from Electrical control panel at UCB)

1. Select 3.3kv Incomer breaker ( incomer-1/ incomer-2)
2. Select Bus coupler in trip selection.
3. Put Key (synch selection) in position “1 - check “.
4. Switch ON synchroscope by putting switch in position “2”.
5. If IN PHASE lamp (green LED) glows. Go to step-6. If OUT OF PHASE (RED LED) Glows
check for voltage/frequency difference & informed to EMD.
6. Close Circuit breaker (control switch position “2”). Incomer will close & Bus coupler
breaker will trip.
7. Change over completed, Switch OFF synchroscope & put key in “0 – OFF” position.
8. Deselect incomer breaker ( incomer-1/incomer-2).

9. Reset all by pressing Control reset.