电力系统保护与控制2025，Vol.53Issue(12)：24-32,9.DOI:10.19783/j.cnki.pspc.240728
小电流接地配电网单相接地过渡电阻估计
Estimation of transition resistance for single-phase grounding faults in small current grounded distribution networks
摘要
Abstract
To identify whether a single-phase grounding fault occurs in a cable section or an overhead line section based on differences in transition resistance,this paper investigates estimation methods for transition resistance in small-current grounded distribution networks.The fundamental principles of four correction methods are discussed,including total approximation(TA)based on the detected zero-sequence voltage,zero-sequence current,and phase voltage;grounding current amplitude correction(GCAC);grounding current vector correction(GCVC);and GCVC plus equivalent zero voltage source correction(GCVC+EZVC).Next,a quantitative error analysis of these methods is conducted,along with a discussion of the impact of typical load distribution.The study shows that while TA has relatively large errors,all the correction methods significantly improve the estimation accuracy of the transition resistance.With GCVC+EZVC,in the case of typical feeder load distribution,although the relative errors are large during low-resistance grounding,the absolute error remains small enough to meet practical requirements.Finally,simulation and experimental results verify the feasibility and effectiveness of the proposed method.关键词
配电网/消弧线圈接地系统/单相接地故障/过渡电阻估计/误差分析Key words
distribution networks/arc suppression coil grounding system/single-phase grounding faults/transition resistance estimation/error analysis引用本文复制引用
刘健,丁俊鹏,杨东明,王毅钊,常小强,张志华,张小庆..小电流接地配电网单相接地过渡电阻估计[J].电力系统保护与控制,2025,53(12):24-32,9.基金项目
This work is supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China(No.5226SX22001C). 国家电网有限公司总部科技项目资助(5226SX22001C) （No.5226SX22001C）
