摘要
配电线路普遍存在具有随机差异性的对地分布参数不对称,现有接地故障保护原理往往在配电线路三相分布参数严格对称的基础上提出,如何提升不对称配电线路接地故障检测与消弧的可靠性是当前故障保护应重点解决的问题。该文立足于国内外配电网接地故障保护的研究进展,首先阐述了配电线路三相分布参数不对称形成的因素,探讨了配电线路三相分布参数不对称对系统零序等效模型、零序电压轨迹和绝缘参数测量的影响。然后,论证了配电线路三相分布参数不对称对零序电流和接地电流的影响,梳理归纳了在不对称影响下故障检测与消弧的研究现状。最后,对计及配电线路三相分布参数不对称随机差异性的单相接地故障检测与消弧发展趋势进行了总结与展望,以期为未来接地故障的研究方向提供参考和建议。
Although the asymmetry of distribution parameters with random differences is common in distribution lines,the existing principle of single line-to-ground(SLG)fault protection is often studied on the basis of strictly equal three-phase distribution parameters.How to improve the reliability of SLG fault detection and arc suppression under asymmetric lines conditions is the key problem to be solved in SLG protection.This paper is based on the worldwhile development research of SLG fault protection.The formative factors for the existence of asymmetry in each feeder are firstly explained,and the influences of SLG fault protection on asymmetric distribution parameters are discussed based on the zero-sequence equivalent model,trajectory of zero-sequence voltage,and measurement of insulation parameters.Then,the influences of asymmetric three-phase distribution parameters on zero-sequence current and grounding current are verified respectively;moreover,the current status of existing research on SLG fault detection and arc suppression under the influence of asymmetry is sorted out and summarized.Finally,the research directions of SLG fault detection and arc suppression considering asymmetric distribution parameters are summarized for providing reference and suggestions for future research directions of SLG fault.
作者
刘宝稳
王晨雨
曾祥君
张慧芬
万子雄
LIU Baowen;WANG Chenyu;ZENG Xiangjun;ZHANG Huifen;WAN Zixiong(College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China;Hunan Province Key Laboratory of Smart Grids Operation and Control,Changsha University of Science and Technology,Changsha 410004,China;School of Automation and Electrical Engineering,University of Jinan,Jinan 250022,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2023年第9期3684-3695,共12页
High Voltage Engineering
基金
国家自然科学基金(51737002)
江苏省自然科学基金(BK20231460)
中央高校基本科研业务费项目(B220203049)。
关键词
配电网
单相接地故障
故障检测
消弧
分布参数不对称
distribution networks
single line-to-ground fault
fault detection
arc suppression
asymmetric distribution parameters
