一起500kV低压电抗器低流保护动作行为的分析

针对某500kV变电站低压电抗器合闸时电抗器低流保护多次动作的情况,通过故障录波图分析及对比试验,指出低压电抗器尾端电流互感器抗直流分量饱和能力不足是导致保护动作的根本原因,并对电抗器低流保护的动作原理提出了改进。

Study on the instantaneous protection reliability of low voltage circuit breakers

This paper outlines the significance of enhancing the instantaneous protection reliability of low voltage circuit breakers and describes their main failure modes. The instantaneous failure mechanism of low voltage circuit breakers was analyzed so that measures to improve instantaneous protection reliability can be determined. Furthermore, the theory of the instantaneous characteristics calibration device for low voltage circuit breakers and the method of eliminating the non-periodic component of test current are given in detail. Finally, the test results are presented.