Reliability Analysis and Suggestions Based on Generator Rotor Grounding Protection
The generator rotor grounding protection of a combustion turbine power plant in Shanghai is configured with two sets of injection type protection,namely,the industrial frequency voltage injection type and the 1-3 Hz low-frequency square wave injection type.Since the two sets of rotor grounding protection affect each other in principle,only one set(1-3 Hz low-frequency square-wave injection ro-tor grounding protection)is put into operation,and the other set of protection is on standby.Recently,the plant #4 generator 1-3 Hz low-frequency square wave injected rotor grounding protection has ap-peared twice in the protection circuit fault alarm,both caused by the generator rotor grounding carbon brush contact failure.Through the introduction of the principle of the protection and the logic of the pro-tection circuit,the cause of the rotor grounding protection circuit failure was identified,and the reliability of the generator rotor grounding protection was analyzed,and the corresponding recommendations and measures were put forward.
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