The industry has become aware of the problem of severe generator damage due to stator ground faults. Two factors have been identified as contributors to this growing problem-the high magnitude of available ground fault current in complex systems with multiple ground sources, and the persistence of fault current through the faulted-generator neutral after its terminal circuit breaker opens. It has been suggested that to prevent this damage, bus-connected industrial generators should be high-resistance grounded and the number of ground sources on the system should be severely limited. This paper provides a brief review of the problem and examines the implementation of the proposed solutions in typical paper mill applications.
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