We experienced the same situation with a large Robicon drive we have on site. The capacitors kept blowing up every so often. Finally Robicon admitted that they had been using poor quality capacitors and they were not holding up. The Robicon rep just finished changing all the caps today and we...
We found two ground faults (960V and 615V) on our Y-delta 4160/480Volt transformer. I have never seen faults of this magnitude on this system. Does any one have any idea of what could cause such large faults besides voltage transients in the line?
