Analysis and Treatment of the 95%Grounding Protection Action in a Generator Stator
On June 27,2018,during the false synchronization test of Unit 1 in a certain power plant before the first grid connection of the generator,95%of the stator grounding protection of the generator acted,causing the turbine to trip and the generator excitation switch to trip.After analyzing the trip timing and fault waveform,and inspecting the on-site equipments,the operator finally determined that the cause of the protection action was a short circuit on the secondary side of the PT used for 95%grounding protection of the generator stator.This article introduces the reasons and treatment methods for the 95%grounding protection action of the generator in the power plant,providing reference for similar equipment failures.
95%grounding protection for generator statorprotection actionPTshort circuit
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