Generator Stator Earth-Fault Protection at Low Frequency Injection - CR4 Discussion Thread

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amitgujarathy Participant Join Date: Oct 2008 Posts: 1	Generator Stator Earth-Fault Protection at Low Frequency Injection 10/09/2008 6:52 AM
	In Large Generators,for providing 100% Stator Earth Fault protection,low Frequency Injection voltage at 20HZ IS WIDELY USED. Why is injected voltage chosen to be 20Hz and not 5Hz or 10 Hz.??
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Anonymous Poster	#1 Re: Generator Stator Earth-Fault Protection at Low Frequency Injection 10/11/2008 6:10 AM
	The relay measurement unit shall be blocked out of 10-40 HZ, because in this frequency range a zero voltage can also be generated by generators starting up or slowing down.
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