1.Low Side Inter locks
1.1 CB Aux Contact - CB should be open Condition
1.2 Bus Earth & feeder line side switch should be Open condition
2 Hi Side Inter Locks
2.1 Transformer side ES should be open condition
LOW SIDE CB CLOSE BLOCK COIL
1. Transformer Protection all lockouts should be normal position
2. 34.5kv Bus earth switch should be open
LOW SIDE CB CLOSEING COIL
1.Hi side breaker should be in close condition
2.Transformer side Disconnector switch should be in closed condition.
LOW SIDE CB TRIPPING
1.All protection LOR
2.High side CB service condition and open
LOW SIDE INCOMER EARTH SWITCH
1.Hi side breaker should be in open condition
2.Transformer side Disconnector switch should be in open condition.
HI SIDE TRANSFORMER FEEDER DS INTERLOCK
1.Low side CB open
2.Low side ES open
HI SIDE TRANSFORMER FEEDER ES INTERLOCK
1. Low side CB open
2. Low side CB in test position
