基于能量比法的输电线路行波故障测距

Energy Ratio Function-Based Traveling-Wave Fault Location for Transmission Lines

输电线路行波故障测距的关键在于对故障行波波头的识别和定位。为实现准确故障测距,应用一种新的信号处理方法,从行波能量的角度出发,利用时窗滚动计算的能量比函数法来处理故障行波,以此计算波头时延,实现故障测距。研究了不同时间窗宽度对定位准确度的影响,以此选择合理的时间窗进行能量比计算,并分析了复杂环境干扰下能量比法的测距精度。ATP/EMTP仿真试验数据处理结果表明,该方法准确有效,而且计算简便快捷,在低信噪比环境下有很好的抗干扰能力。

The crux of traveling wave fault location for transmission lines is the identification and location of the wave front of fault generated traveling wave. To implement accurate fault location, a new signal processing method is utilized, i.e., from the viewpoint of traveling wave energy the fault generated traveling wave is processed by the energy ratio function obtained from time-window continuous calculation, thus the time-delay of wave front can be calculated and fault location is implemented. The influences of different time-window widths on location accuracy is researched and on this basis rational time-window is chosen for the calculation of energy ratio, meanwhile the accuracy of fault location by energy ratio under complex environmental interference is analyzed. Processing results of ATP/EMTP simulation data show that the proposed method is accurate and effective, and the calculation is simple, convenient and rapid, besides, it possesses satisfied anti-interference ability in the environment with low S/N ratio.