暂态录波型故障指示器的单相接地故障研判应用

实际工程应用中,常采用暂态录波型故障指示器与配电自动化主站相配合的方法对配电网单相接地故障进行定位。本文针对现场暂态录波型故障指示器应用效果,对故障指示器安装过程中可能出现的反向、错相问题,提出了基于稳态特征的波形预处理方法,对故障指示器运行过程中可能出现的三相录波不同步问题,提出了总体最小二乘-基于旋转不变技术的信号参数估计(total least square-estimation of signal parameters via rotation invariance techniques,TLS-ESPRIT)波形同步校正方法,修正故障指示器录波波形,提升波形可用性。针对故障指示器采样频率较低、瞬时暂态波形特征误差较大等问题,提出了基于相关系数法的故障定位算法,提升主站单相接地故障定位准确性。最后,通过现场实际案例验证了文中所提方法能有效校正故障指示器录波波形、准确定位接地故障,提升配网接地故障处理能力。

Application on Transient Recording Fault Indicator for Single-Phase Grounding Fault Diagnosis

Transient recording fault indicator is often used in conjunction with the distribution automation master station to diagnose distribution network single-phase grounding fault in practical engineering application.In view of the problem of reverse,or wrong phase during fault indicator installation process,waveform preprocessing method based on steady state characteristics is proposed.In view of the problem of asynchronous three-phase recording,total least square-estimation of signal parameters via rotation invariance techniques(TLS-ESPRIT)waveform synchronization correction is proposed to improve the credibility of the recorded waveform.Aiming at the problem such as low sampling frequency and large transient waveform characteristic error,a fault location algorithm based on the cor-relation coefficient method is proposed to improve the accuracy of single-phase grounding fault location in the master station.Finally,field actual cases verify that the method proposed in this article can effectively correct the recorded waveforms,accurately locate the grounding fault,and improve the grounding fault handling capability of the distribution network.