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Failure Analysis of Components Due to 480-V Ground Faults

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2 Author(s)
Love, D.J. ; Bechtel Power Corporation, P.O. Box 60860, Terminal Annex, Los Angeles, CA 90060. ; Hashemi, N.

While many preferred methods exist for protecting components against damage from ground fault currents on 480-V systems, few analyses (if any) have been made concerning the effects on components (molded-case breaker, overload relay, etc.) due to a failure or absence of a ground fault protective device to clear a ground fault. Unlike fuses, which by definition could be considered self-protecting, no such feature exists in relays, molded-case breakers, or overload relay heater elements. The need for sensitive ground fault protection is clarified as by using known I2t techniques to examine the circuit components.

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Industry Applications, IEEE Transactions on  (Volume:IA-22 ,  Issue: 4 )