电源机组组保护换型后过电压保护误动分析

The Thinking for Generator Overvoltage Protection Malfunction after Generator and Transformer Grop Protection Exchange Type

发变组整流型保护更换为微机型保护后，因为原先并联在电压互感器二次侧熔丝上的一个电容，引起了发电机过电压保护误动作跳闸，误动作原因是LC串联谐振过电压。本文具体分析了事故的原因和微机保护改造后拆除二次回路电容的必要性，由此提醒电力同行在保护微机化改造过程中吸取教训，防微杜渐。

After commu ration type protection of generator and transformer grop replace for microcomputer type protection, generator＇s overvoltage protection misoperate trip because capacitance what for originally incidenceat at TV secondary side fuse,the cause of overvoltage protection rnisoperation is LC series resonance overvoltage. This paper in the concrete analyses necessity of dismantling secondary circuit capacitance after microcomputer protection transformation. Thereof remind rest power craft brother in the course of microcomputer protection transformation extract indoctrinate.