山东电力技术2025，Vol.52Issue(9)：1-9,9.DOI:10.20097/j.cnki.issn1007-9904.2025.09.001
基于零序电压投影量的小电阻系统单相接地故障测距方法
Single-phase Ground Fault Location Method for Low Resistance System Based on Zero Sequence Voltage Projection
摘要
Abstract
Aiming at the problem of low power supply reliability caused by long time-consuming manual line inspection after single-phase grounding faults of low-resistance grounding systems,a fault location method based on zero-sequence voltage projection gradient is proposed to determine the accurate fault location.Firstly,the distribution characteristics of zero-sequence current and zero-sequence voltage after single-phase grounding of low resistance grounding system are analyzed by using a zero-sequence equivalent circuit diagram.Secondly,the distribution characteristics of zero-sequence voltage projections of single-type lines and hybrid lines are analyzed by the phasor diagram of zero-sequence voltage changes of fault lines.It is found that after the hybrid lines are equivalent,the projections of both are linear functions of the distance to the bus.Finally,on the basis of accurately obtaining the location results of the section,a ranging method based on the gradient of zero-sequence voltage projection is proposed.A 10 kV small resistance grounding distribution network is built by MATLAB/Simulink,and simulation experiments are carried out on different line types.The results show that the method has high ranging accuracy and can effectively overcome the influence of inaccurate parameters of a single type of line on ranging results.关键词
单相接地故障/小电阻系统/零序电压投影量/分布特征/梯度测距Key words
single-phase ground fault/low-resistance systems/zero-sequence voltage projection/distribution characteristics/gradient ranging分类
信息技术与安全科学引用本文复制引用
朱文贺,李守钦,李广,齐兰涛,仉志华..基于零序电压投影量的小电阻系统单相接地故障测距方法[J].山东电力技术,2025,52(9):1-9,9.基金项目
国家自然科学基金项目(52077221). National Natural Science Foundation of China(52077221). （52077221）
