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Protection in Electrical circuit

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fakhtar

Electrical
Joined
Apr 9, 2009
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1
Location
IN
How to monitor ground fault in tertiary winding transformer Primary- Delta -6.6 KV 3 Ph, Secondary 1- Delta 2- Star 710 Volts 3 Phase 50 Hz Unearth used for 12 pulse VVFD. The Secondary voltage from transformer to Drive is in floating state.
 
Zero sequence voltage is about the only way to detect a ground on an "ungrounded" system. Not completely ungrounded, there is capacitance to ground from each of the phases.
 
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