【摘要】 对故障行波波头的识别方法进行分析和比较,采用互相关函数的改进——单位脉冲响应法对单端行波故障测距的可行性进行了研究。依据相关函数能够反映2个信号所共有的频率成分、能完整地保留相位方面的信息的特性,同时考虑故障行波具有的宽带特征,提出了使用和故障行波具有相同频段的动态参考波与故障行波进行相关。在考虑环境干扰的情况下,处理的结果能够准确地判断初始行波、故障点反射波和对端母线到达的时刻,测距精度理想。和小波分析法相比,动态的参考波对于在复杂的干扰环境下提取有用的故障波形更加灵活、有效。更多还原

【Abstract】 The ways of wave front identification are analyzed and compared,and the unit impulse response method,an improved cross correlation function,is used to study the feasibility of single-end traveling wave fault location.The correlation function reflects the common frequency of two signals and keeps the phase data completely,based on which and considering the frequency domain characteristics of fault traveling waves,it is proposed to correlate the fault traveling wave with the dynamic reference wavein the same frequency band.In interferential environment,it can correctly detect the arrival time ofinitial traveling wave,reflecting wave from faulty point and reflecting wave from the opposite end of bus,with ideal fault locating precision.Compared with the wavelet analysis,the dynamic reference wavesare more flexible and effective in extracting the available fault traveling waves in the complex environment with serious noise.更多还原