川渝断面失步解列装置配置研究

摘要:

对当前中国电网中常用的失步解列装置及其原理进行了综述和说明。同时，对川渝断面失步解列装置配置 的可能性及其效果进行了计算和分析。

Abstract:

There is a certain zero － sequence voltage theshold for power directional component of conventional pilot zero － sequence protection，and thus there will be voltage dead zone． If high － resistance grounding fault occurs on the long lines whose zero － sequence impedance is very small in one side，it is possible to make the zero － sequence voltage below the threshold， resulting in the malfunction of zero － sequence directional protection． To solve the problem，a method by comparing the zero － sequence compensating voltage and the zero － sequence voltage at the place equipped with protection is proposed considering the imbalance zero － sequence voltage，which can effectively determine the positive or negative direction of the fault． The simulation results show that the proposed scheme is simple and easy，and can improve the reliability of pilot zero － sequence directional protection．