摘要
矿山小电流接地系统发生单相接地故障时,基波零序电流幅值大、故障特征明显,因此零序电流选线法准确度较高;然而消弧线圈的补偿作用会造成零序电流选线法失灵,限制了零序电流选线法的使用。针对现有零序电流选线法选线方法无法应用于中性点经消弧线圈接地的小电流接地系统的问题,提出了一种新的基于大数据模型的小电流接地系统单相接地故障选线方法。首先总结了小电流接地系统发生单相接地故障时的故障特征,梳理了现有主要选线方法,分析指出消弧线圈的补偿作用是限制基波零序电流选线方法应用场景的主要原因。基于此,引入了大数据模型,用于形成线路的特征数据,从而区分正常线路与故障线路,实现准确的小电流接地系统单相接地故障选线。算例结果表明了所提方法的可行性和有效性。
When a single-phase grounding fault occurs in a small current grounding system,the amplitude of the fundamental zero-sequence current is large and the fault characteristics are obvious,resulting in a high accuracy of the zero-sequence current fault line selection method.However,the compensation effect of the arc suppression coil can cause the zero-sequence current line selection method to fail,limiting its application.To solve the problem that existing zero-sequence current fault line selection methods cannot be applied to small current grounding systems with neutral grounding through arc suppression coils,a new fault line selection method for single-phase grounding faults in small current grounding systems based on big data modeling is proposed.Firstly,the fault characteristics of single-phase grounding faults in small current grounding systems are summarized,and the existing main fault line selection methods are reviewed.Analysis indicates that the compensation effect of the arc suppression coil is the main reason limiting the application scenarios of the fundamental zerosequence current line selection method.Based on these,a big data model is introduced to form characteristic data for the lines,thereby distinguishing between normal and faulty lines and achieving accurate line selection for single-phase grounding faults in small current grounding systems.The results of case studies demonstrate the feasibility and effectiveness of the proposed method.
作者
张宇博
赵建科
张烜赫
孟超
车延博
ZHANG Yubo;ZHAO Jianke;ZHANG Xuanhe;MENG Chao;CHE Yanbo(Beijing Jingneng Energy Technology Research Co.,Ltd.,Beijing 100089,China;Tianjin University,Tianijin 300072,China;The Hong Kong Polytechnic University,Hongkong 999077,China)
出处
《中国矿业》
北大核心
2025年第S1期300-305,共6页
China Mining Magazine
关键词
电力系统
继电保护
小电流接地系统
故障选线
单相故障
大数据
power system
relay protection
small current grounding system
fault line selection
single-phase fault
big data
