内蒙古电力技术2025，Vol.43Issue(5)：58-65,8.DOI:10.19929/j.cnki.nmgdljs.2025.0062
电容电流超标变电站的中性点不接地方式研究
Research on Ungrounded Mode of Neutral Point for Substations with Excessive Capacity Current
摘要
Abstract
Aiming at the significant challenges faced by traditional neutral point grounding methods in the case of increasing capacitive current in the distribution network,a feasibility study on the neutral point ungrounded method for 10 kV substation with excessive capacitive current is carried out.Firstly,a simulation model of the substation with excessive capacitive current is established.Secondly,the neutral point grounding methods are set as ungrounded and grounded through the arc suppression coil,and the single-phase grounding fault and intermittent arc grounding fault of the distribution network are simulated by modifying the parameters such as the fault point transition resistance.Finally,the fault current,fault voltage and other data from the aspect of safety and stability are compared and analyzed.The results show that the neutral point ungrounded mode is convenient for quickly selecting the fault lines using fault current and voltage data,and there is no threat of high-amplitude arc overvoltage.It is recommended to be listed as one of the reference operation modes of the substation with excessive capacitive current.The data and conclusions obtained can provide a theoretical reference for the transformation of the neutral point grounding mode of the distribution network.关键词
配电网/电容电流/中性点不接地/单相接地故障/间歇性电弧接地故障Key words
distribution network/capacity current/neutral point ungrounded/single-phase grounding fault/intermittent arc grounding fault分类
信息技术与安全科学引用本文复制引用
王云龙,薛可钦,张源渊,周洋,王延国,杨兰均..电容电流超标变电站的中性点不接地方式研究[J].内蒙古电力技术,2025,43(5):58-65,8.基金项目
内蒙古电力(集团)有限责任公司科技项目"变电站10kV电容电流超标威胁性分析与治理方案研究"(20220301) （集团）
