基于卫星对时的架空线路故障离线定位方法  

Off-line Fault Location Method for Overhead Lines Based on Satellite Time Synchronization

作　　者：徐铭铭 王俊杰[2] 董轩 薛永端[2] 陈明 XU Mingming;WANG Junjie;DONG Xuan;XUE Yongduan;CHEN Ming(Electric Power Research Institute of State Grid Henan Electric Power Company,Zhengzhou 450052,Henan Province,China;School of New Energy,China University of Petroleum(East China),Qingdao 266580,Shandong Province,China)

机构地区：[1]国网河南省电力公司电力科学研究院,河南省郑州市450052 [2]中国石油大学(华东)新能源学院,山东省青岛市266580

出　　处：《全球能源互联网》2024年第5期530-540,共11页Journal of Global Energy Interconnection

摘　　要：针对现有架空配电线路故障离线定位方法定位可靠性与精度不足的问题,建立适用于阻抗特征分析的线路等效模型,通过分析故障线路不同检测点处的零序阻抗角差异,提出一种基于卫星对时的故障离线式定位方法。该方法向停电隔离后的故障线路首端注入频率、相位恒定的交流电压信号,并手持信号接收装置进行人工巡线,利用卫星对时完成信号接收与注入装置间的同步采样,在不采集电压的情况下,即可实现检测点零序阻抗角的计算,进一步通过比较不同检测点处零序阻抗角差异,确定故障分支及故障点精确位置。分析并明确了注入信号频率、故障点过渡电阻与时钟同步误差对故障定位精度产生的影响。数字仿真结果表明该方法可有效实现故障的精确定位。Addressing the unreliability and inaccuracy of current offline fault location methods for overhead distribution networks,this study proposes an offline fault location method based on satellite timing.To locate the fault,an AC voltage signal of fixed frequency and phase is injected at the fault line's origin after power isolation.Subsequently,the fault line is manually surveyed with a portable signal receiver.Synchronous sampling,enabled by satellite timing,allows for the determination of the zero-sequence impedance angle at each monitoring point without voltage data.The precise fault location is deduced by analyzing the variance in zero-sequence impedance angles across multiple monitoring points.Moreover,the study examines how the injected signal's frequency,the fault point's transient resistance,and clock synchronization discrepancies affect the accuracy of fault localization.Simulations validate the approach's precision in identifying fault locations.

关 键 词：架空配电线路 交流信号注入 卫星对时 故障离线定位 

分 类 号：TM726.3[电气工程—电力系统及自动化] TM711