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Analysis and Countermeasures for Mal-operation of Pilot Post-acceleration Protection
Author(s): 
Pages: 97-101
Year: Issue:  7
Journal: Automation of Electric Power Systems

Keyword:  后加速保护跳闸位置继电器阻抗元件非全相运行;
Abstract: 线路保护通常采用跳问位置继电器TWJ接点返回作为重合后加速保护开放的判据.通过对一起纵联后加速保护误动事故的分析,指出早期TWJ回路设计的不足:其接点返回时刻与断路器合闸时刻存在较大差异,导致线路保护提前投入重合后加速逻辑;同时,其保护装置软件存在缺陷,距离加速元件在非全相运行期间会满足动作条件.这些因素可能造成后加速保护在断路器重合于无故障时发生三相跳闸.从二次回路与保护装置相互配合的角度出发,...
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