Generator ground-fault protection aspects are analyzed for midsize cogeneration plants. In these plants, the generators may be connected to a common generator bus. The overall bus-connected system should be considered when applying generator high-resistance grounding schemes. Calculations are reviewed for sizing generator neutral-ground resistance and evaluating third harmonic originated in the scheme. The relevant applications of third harmonics in applying 100% stator ground-fault protection schemes are examined. Practical considerations are presented for establishing selectivity of ground-fault protection schemes in the case of a common generator bus.
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Rasheek Rifaat (1997) studied this question.
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