evaluation of the stator ground-fault protection for synchronous generators by means of the subharmonic injection method
Main Article Content
In this paper, we make an evaluation of the complete ground-fault protection of the stator of synchronous generators by use of the subharmonic injection method. Firstly, we describe two approaches for the complete protection of the stator: the third harmonic method and the method of subharmonic injection. Secondly, we analyze the error in the determination of the ground-fault resistance for an 11.4 kV synchronous generator from the consideration of various operating conditions. This error is related to the type of voltage transformers being used, the occurrence of signal noise, the digitalization process, and variations in the numerical values of the required parameters. Lastly, we show that the subharmonic injection method is very useful for the determination of the ground-fault resistance and performs well for the complete protection of the stator.
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