小相角故障行波测距方法研究

摘要

为滤除环境干扰，提取输电线路小相角故障时的微弱行波信号，实现准确故障测距，提出了能量比法。从行波能量角度出发，选择合理时间窗，并利用时窗滚动处理故障行波进行能量比计算，得到信号波头时延以实现故障测距。仿真结果表明，该方法在低信噪比环境下有较强抗干扰能力，对微弱突变有效信号也十分敏感，可广泛应用于行波故障测距领域。%In order to filter noises, to collect weak traveling wave signals when small phase-angle failure occurred and to implement ac-curate fault location, this paper utilized an energy ratio method. From the viewpoint of traveling wave energy, rational time window was chosen to continuously process fault traveling wave to carry out the calculation of energy ratio, thus the time-delay of wave front could be calculated and fault location was implemented. Simulation results show that this method has stronger anti-interference ability in the en-vironment with low S/N ratio, accurately identifying weak variation signals. This method has the practical value for traveling wave fault location.