Grounding of Generators Connected to Industrial Plant Distribution Buses

Increasing ``energy consciousness´´ in industry is causing expanded interest in in-plant generators, which are normally connected to the main plant distribution bus. Electrical system reliability requires the proper application of neutral grounding and ground fault protection for these machines. Mechanical limits on safe generator ground fault currents, possible circulating harmonic currents in multiunit installations, and the effects of internal ground faults add complexity.