Faulty feeder detection for single-phase-to-ground fault in resonant grounding system based on transition resistance estimation

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Electric Power Systems Research Pub Date : 2025-07-28 DOI:10.1016/j.epsr.2025.112067

Xiaowei Wang , Linhui Fan , Xiangxiang Wei , Jie Gao , Fan Zhang , Xinqian Wang

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引用次数: 0

Abstract

Aiming at the weak fault characteristics and poor adaptability of existing methods during high-impedance faults in 10 kV resonant grounding distribution systems, this paper proposes a fault detection method based on transition resistance estimation. Firstly, transient equivalent models of faulty and healthy feeders are constructed by using lumped parameters, and voltage-current matrix equations are obtained. Secondly, by analyzing the differences in the phase-frequency characteristics between lumped parameter model and distributed parameter model, the characteristic frequency band of each feeder is determined. Finally, the transition resistance value of each feeder is estimated by using the nonlinear least squares method, and thus the fault detection criterion is constructed. Specifically, if the transition resistance values of all feeders are greater than 10000Ω, it is determined as a bus fault. Conversely, the feeder corresponding to the minimum value is identified as faulty feeder. Simulation results and field tests show that it can accurately achieve fault detection in high-impedance faults and even complex grounding scenarios.

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基于过渡电阻估计的谐振接地系统单相接地故障馈线检测

针对现有方法在10kv谐振接地配电系统高阻抗故障中故障特征弱、适应性差的问题，提出了一种基于过渡电阻估计的故障检测方法。首先，采用集总参数法建立了故障馈线和正常馈线的暂态等效模型，得到了电压电流矩阵方程；其次，通过分析集总参数模型与分布参数模型相频特性的差异，确定各馈线的特征频带；最后，利用非线性最小二乘法估计各馈线的过渡电阻值，从而构造故障检测判据。具体来说，如果所有馈线的过渡电阻值都大于10000Ω，则判定为母线故障。反之，最小值对应的给料机被识别为故障给料机。仿真结果和现场试验表明，该方法在高阻抗故障甚至复杂接地场景下都能准确实现故障检测。

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来源期刊

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.