基于自然频率的高压电缆单端行波测距方法

Fault Location Method of High-voltage Cable Single-ended Travelling Wave Based on Natural Frequencies

在高压电缆的行波测距中,准确识别波头到达时刻一直是重点和难点。引入提取行波自然频率的方法以提高单端行波测距的精度。研究了行波主频和在此频率下的波速与故障距离的关系。在此基础上,针对高压电缆的特点,利用PSCAD软件对主绝缘故障进行了相应的仿真,分析并验证了该故障条件下行波频谱的特点及算法的误差。

the accurate identification of the arrival time of the wave head has been the focus and difficulty in fault location of the high-voltage cable traveling wave. This article introduces the method of extracting the natural frequency of the traveling wave to improve the fault location accuracy of the single-ended traveling wave. The relationship between the traveling wave frequency and the velocity and the fault distance at this frequency is examined. On this basis ,in terms of the characteristics of high-voltage cables ,the article provides the simulation and analysis of the primary insulation fault with the help of PSCAD software,and verifies the features of the frequency spectrum of the traveling wave under this fault condition and the algorithm error.