A principle for resonance measurement based on injecting resonant frequency signal is presented in this paper. The grounding capacitance of lines and equipment and the grounding fault resistance can be measured online in ineffectively grounded systems. Petersen-coil automatic tuning is implemented, and 100% stator grounding fault protection for generator stator windings is also proposed. The prototype for Petersen-coil tuning has been tested on networks for many years. In addition, the new method for generator stator grounding fault protection is verified by simulation.
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Zeng et al. (2001) studied this question.
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