电力系统保护与控制2025，Vol.53Issue(11)：41-50,10.DOI:10.19783/j.cnki.pspc.241015
基于幅值比与相位差的灵活接地系统单相高阻故障检测方法
Single-phase high-impedance fault detection method for flexible grounding system based on amplitude ratio and phase difference
摘要
Abstract
Protection in flexible grounding systems mainly relies on time-limited zero-sequence overcurrent protection methods used in low-resistance grounding systems,which have limited capability to tolerate transition resistance.As a result,existing methods struggle to effectively detect faulty feeders.Aiming at this problem,a detection method based on the amplitude ratio and phase difference of zero-sequence currents is proposed.First,time-domain equations are used to analyze the zero-sequence currents between each feeder and the neutral point after low-resistance grounding.Then,by incorporating the inherent parameters of the distribution network,the specific differences between the amplitude ratio and phase difference of each feeder after adding the small resistors are obtained.Finally,by comparing the amplitude ratio of the zero-sequence current between the faulty feeder and the neutral point,it is found to be significantly higher than that of healthy feeders,thus forming Criterion 1.Additionally,by analyzing the phase difference of the zero-sequence current between the faulty feeder and the neutral point,it is found to differ by 90° from healthy feeders,thus forming Criterion 2.Simulation and field test results indicate that the proposed method can accurately detect single-phase high-impedance ground faults in flexible grounding systems,and is robust against current transformer polarity reversal,data loss,intermittent arcs,and strong noise.关键词
灵活接地系统/单相高阻故障/幅值比/相位差Key words
flexible grounding systems/single-phase high-impedance fault/amplitude ratio/phase difference引用本文复制引用
张帆,王晓卫,王新茜,范林慧,王毅钊,白浩..基于幅值比与相位差的灵活接地系统单相高阻故障检测方法[J].电力系统保护与控制,2025,53(11):41-50,10.基金项目
This work is supported by the National Natural Science Foundation of China(No.52177114 and No.61403127). 国家自然科学基金项目资助(52177114,61403127) （No.52177114 and No.61403127）
国网陕西省电力有限公司科技项目资助(5226KY23001U) （5226KY23001U）
