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from the Ground fault department...
Equalizing Ground Fault
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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
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
| Posted by Phil Corso  on 2 July, 2012 - 11:44 am |
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
Thus, they will not respond to earth-faults!
Regards, Phil Corso
| Posted by Phle Corso on 2 July, 2012 - 8:10 pm |
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