Analysis on reasons of rotor singlepoint grounding fault and treatment measures

Abstract

Abstract: Abstract:The generator rotor grounding protection of unit No.4 in a power plant is based on the principle of PingPang type switchover protection. The rotor singlepoint grounding fault of the unit was analyzed, and it was determined that the reason of the fault is to change the protection output mode blindly. It was pointed out finally that for the devices based on the principle of PingPang type switchover protection, it is necessary to avoid turn on the switches of the rotor voltage circuit in multiple devices simultaneously; else the mutual interference may occur between the devices and cause the incorrect trip of the protection.

Key words: Key words:generator, excitation winding, rotor grounding protection, relay protection, principle of PingPang type switchover protection

LI Feng, LIU Haixia. Analysis on reasons of rotor singlepoint grounding fault and treatment measures[J]. Huadian Technology, 2013, 35(8): 41-42.

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Analysis on reasons of rotor singlepoint grounding fault and treatment measures

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