Equalizing Ground Fault

S

Thread Starter

Shaheed

How can we equalize the ground fault in ground fault current with open delta voltage?

A generator is protected by a ground fault CT of 200/5 set to 2.5A secondary. When synchronized with grid the NGR switched off and the only protection of ground fault depends on open delta PT 11KV/110V. Somebody can guide how much secondary voltage of open delta would be equal to 2.5A secondary fault current of CT?

Regards
Shaheed
 
Shaheed... PTs having their secondaries open-delta (connected) usually have their primary-windings connected phase-to-phase.

Thus, they will not respond to earth-faults!

Regards, Phil Corso
 
Top