【摘要】 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。更多还原

【Abstract】 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.更多还原