基于参数不平衡检测的电抗器匝间保护方法

本文提出了一种基于参数不平衡检测的高压并联电抗器匝间保护方法,该方法建立在时域参数模型基础上,利用高压电抗器的本末端电气量,计算出在最小二乘意义下的各相的电气参数。基于高压分相并联电抗器不可能三相同时发生匝间短路故障的前提下,通过构建体现三相参数不平衡和参数突变的综合检测判据,来识别高压电抗器是否发生匝间短路故障。

An Interturn Fault Protection Method of the HV Shunt Reactor Based on the Unbalanced Parameter Detection

An interturn fault protection method of the HV shunt reactor is put forward in this paper, which is based on the unbalanced parameter detection. This method is established on the basis of the time-domain parameter model, and uses the electrical quantities at two terminals of the HV reactor to calculate the electrical parameters of each phase by mean of least squares algorithm. Suppose that the interturn short-circuit faults of the HV phase-separated shunt reactors impossibly occur at three phases at the same time, we could identify whether the interturn short-circuit fault of the HV reactor occurs by designing the comprehensive detection criterion which could reflect three-phase unbalanced parameters and parameter mutation.