基于合成矢量的MOA故障判断方法

Calculation Method of MOA Resistive Fundamental Current Growth Rate Based on Synthetic Vector

摘要: 针对传统避雷器检测方法中阻性电流幅值太小不易测量的问题，本文提出了一种基于合成矢量的MOA阻性基波电流增长率的计算方法。该方法基于“一”字排列的三相避雷器模型，利用合成矢量的方法消除相间耦合电容对泄漏总电流的影响，同时，通过合成矢量相角的变化来间接获得单相阻性泄漏电流幅值的变化，极大的提高了阻性基波电流增长的测量精度。仿真分析和实验结果表明，该算法不仅能有效计算MOA阻性基波电流的增长情况，而且可真实反映避雷器的运行状态。

Abstract: According to the truth that the resistive leaking current is too small and difficult to measure in the traditional attester detection method, this paper proposes a method to calculate the MOA resistive leaking current growth rate based on the synthetic vector. The method is based on a three-phase arrester model arranged in a font. The utilization of synthetic vector approach can eliminate the effect of interphase coupling capacitance on the total leakage current. Meanwhile, we can obtain the change of single-phase resistive leakage current amplitude indirectly by the change of the synthetic vector which greatly improves the measurement accuracy of resistive leakage current. Simulation and experimental results show that this algorithm can effectively calculate the growth of resistive leakage current of MOA and can truly reflect the operating status of arrester.