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提出了一种适用于高阻接地故障的故障测距新算法。该算法基于微分方程描述的线路数学模型 ,利用单端信息对高压输电线路进行故障测距 ,保留了解微分方程算法的简单可靠、现实可行、不必滤除衰减直流分量、不受电网频率波动的影响等优点 ,同时消除了过渡电阻的影响 ,克服了传统解微分方程法中 ,在经高阻接地故障时测距误差过大的缺点 ,为检验算法的精度 ,进行了大量的EMTP数字仿真实验。仿真结果表明 ,算法原理正确并具有较高的测距精度。
A new algorithm for fault location based on high impedance grounding fault is proposed. Based on the mathematic model of line described by differential equation, this algorithm uses single-ended information for fault location of high-voltage transmission line. It is simple and reliable to keep the differential equation algorithm in practice. It is not necessary to filter the decaying DC component and not affect the frequency fluctuation of power grid. And eliminate the influence of the transition resistance at the same time. It overcomes the shortcomings of the traditional unbalanced equation method in ranging error caused by high impedance grounding fault. In order to test the accuracy of the algorithm, a large number of EMTP digital simulation experiments are carried out. Simulation results show that the algorithm is correct in principle and has a high accuracy of ranging.