Dear Team,
Would like to share some incident happened in our power plant.
There was Short circuit fault occurred on 33KV line between phase B & C and the fault traveled up to power plant 11KV Bus.
11KV feeder Protection relay was operated on I>> Short circuit, this 11KV feeder is connected to 11KV/33KV Step up T/F.
Fault current details of 11KV, In 1250 amps, Set value 3xIn(3750 amps) with T - 0.30 sec, Fault current - 4.41XIn(5512.5 amps).
when this fault traveled up to 11KV bus where power plant Generators are connected then the Bus voltage dropped up to 6.1 KV.
So just would like to know that is this behavior of voltage drop of generator at 11KV is normal with this kind of heavy Short circuit fault or pl share what will be the impact of short circuit current on source voltage.