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Arcing Ground Faults

Arcing Ground Faults

Arcing Ground Faults

(OP)
I have a 3 phase, 4-wire, 120/240 volt delta service to a machine shop.  I have recently had some 3 phase equipemnt damaged: an inverter, transformer, and 2 three phase surge protectors damaged from high voltage.  There was no damage to any single phase equipment.  I suspect an arcing ground fault.  Any information on this subject and references would be appreciated.  Also any suggestions on how to locate the point of fault.

RE: Arcing Ground Faults

Suggestion: A ground fault transformer with the high-resistance grounded neutral, the ground fault monitoring and possibly trip.
References:
1. D. Beeman "Industrial Power Systems Handbook," McGraw-Hill Book, Co., 1955
2. ANSI/IEEE Std 242-1986 Chapter 7 "Ground Fault Protection"

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