基于行波理论的输电线路雷击定位方法研究与应用

Lightning Fault Location Method and Its Application for Transmission Line Based on Traveling Wave Method

为研究输电线路雷击定位,结合工程实际需求,在非接触式雷电流在线监测系统基础上建立了基于行波理论的新型输电线路雷击定位方法。该方法在传统单端法、双端法的基础上进行改进,以不受波速影响。首先根据首波前到达时间和极性确定雷击范围;再通过分析反射波前极性,确定不同波前到达监测点的依次顺序;最后利用小波变换提取相应波前到达时间进行定位计算。经EMTP-ATP软件仿真验证,相比较传统测距法而言,该研究提出的新型雷击定位方法精确度更高,误差均<0.5%;同时改进型双端法定位计算误差均<0.3%,比改进型单端法误差更小,更适用于实际应用。根据非接触式输电线路雷电流监测系统获得的实测数据,进行了初步雷击定位,进一步验证了该方法的实用性。

To improve the lighting location of transmission lines, taking engineering requirements into consideration, we put forward a novel lightning location method based on the traveling wave theory for non-contact lightning monitoring systems. The method is improved from the traditional single-end method and the double-end method to avoid influence of wave velocity. Firstly, we determine the lightning range according to the arrival time and polarity of the first wave. Then, the different wave fronts can be sequenced by analyzing the polarities of reflected waves. Lastly, through wavelet transformation, we can extract the corresponding arrival time of each wave front for locating lightning. We verify the proposed method through simulations in EMTP-ATP. It is shown that the method has error less than 0.5%, which indicates higher precision than traditional location methods. Plus, the improved double-end method has error less than 0.3%, which is smaller than that of the improved single-end method, so it suits engineering applications better. Using the proposed method, we calculate some field data from a non-contact lightning monitoring system, further proving that the novel method is practical.