一起微机母差保护误动作事故分析

Analysis of a misoperation accident in microcomputer-based bus differential protection

对WMZ-41微机母差保护一次误动作过程详细描述,分析误动作原因,指出母线连接支路CT性能差异,切除外部故障后母差保护装置中会产生差流。对进一步完善设备功能和设备运行有一定借鉴作用。

This paper details the maloperation process of WMZ - 41 computer-based bus differential protection in a power accident. It analyzes the course of the accident and distinguishes different performances when bus connects branch CT. It indicates that bus differential protection would produce differential current after external failure is cut off. To pursue further perfect device function and more reliable device operation, this paper would supply some reference value.