基于时域反射法的电力电缆网络故障诊断方法研究

Research on Fault Diagnosis Method of Power Cable Network Based on Time Domain Reflectometry

针对维护大规模老化电力电缆网络这一关键挑战,通过详细描述电力电缆中的信号传输物理模型,提取反射信号和透射信号中的故障特征,研究基于时域反射法的电力电缆网络故障诊断方法,实现电缆网络故障的快速辨识与定位;以最小单元Y型电缆网络为研究对象并建立其物理模型,利用分布式检测时测点之间的反射信号及透射信号所反映出的信号传播路径和阻抗不匹配信息,开展多源信息融合的电缆网络故障诊断方法研究;在Matlab/Simulink软件环境中搭建Y型电缆网络的故障仿真模型,通过设计不同主干、分支线路故障的仿真实验,验证了方法的有效性和适用范围,测量得到的故障距离相对误差限定在1%内。

Aiming at the key challenge of maintaining large-scale aging power cable networks,the physical model of signal transmission in power cables was described in detail to extract the fault characteristics of reflected signal and transmitted signal.The fault diagnosis method of power cable network based on time domain reflection method was studied to realize the rapid identification and location of cable network faults.Taking the minimum unit Y-type cable network as the research object,and establishing its physical model,the signal propagation path and impedance mismatch information were reflected by the reflected signal and transmitted signal between the measuring points in the distributed detection,which studied the cable fault diagnosis method based on the multi-source information fusion.The fault simulation model of Y-type cable network was built in Matlab/Simulink software environment.The experimental results show the method verifies the effectiveness and application range of in the different trunk and branch lines.The relative error of the measured fault distance is within 1%.