基于故障暂态信号及其衰减特征的配网单相接地故障测距  

Single-phase-to-ground fault location based on transient fault signal and its attenuation character for distribution network

作　　者：张文海[1] 肖先勇[2] 汪颖[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065 [2]四川大学智能电网四川省重点实验室,四川成都610065

出　　处：《电力自动化设备》2013年第3期46-52,共7页Electric Power Automation Equipment

基　　金：四川省科技支撑项目(2010GZ0256)~~

摘　　要：提出基于故障暂态信号及其衰减特征的单相接地故障测距法,利用中性点非有效接地系统单相接地故障时非故障相电压升高引起的线路电容充电暂态信号及其衰减特征,自适应确定暂态信号有效区段并计算故障距离。该方法可充分利用故障暂态信息。分别利用实小波、复小波和S变换法提取充电信号特征并计算故障距离,对比和仿真表明,S变换法提取故障暂态特征效果最好,所提方法只需单端测量,利用了暂态信号幅值大的优点,可有效解决故障电阻较小时的单相接地故障测距问题,受故障距离、故障电压初相角及噪声的影响小。A method of single-phase-to-ground fault location is proposed based on the transient tault sagnal and its attenuation character. The transient signal of line capacitive charging caused by the voltage rising of healthy phases during the single-phase-to-ground fault of noneffeetively earthed system at neutral point and its attenuation character are used to adaptively identify the effective segment of the transient signal and calculate the fauk distance. It makes full use of the transient signal. The real wavelet transform,complex wavelet transform and S transform are applied to extract the transient character of charging signal and calculate the fault distance respectively. Comparison and simulation show that the S transform is the best. With the measurements of single end only and little effect by the fault distance,fault vokage initial angle and noise,the proposed method locates the grounding fault effectively when the fault resistance is smaller due to the large magnitude of transient signal.

关 键 词：配网 非有效接地 单相接地故障 故障测距 衰减特征 有效区段 暂态 接地 

分 类 号：TM711[电气工程—电力系统及自动化]