一起电流互感器二次回路两点接地引起保护误动机制分析  

Analysis of Protection Misoperation Caused by Two-Point Grounding of Current Transformer Secondary Circuit

作　　者：代奇迹 王宇 韩雪 高吉普 张钥朗 李堃 姜骞 DAI Qiji;WANG Yu;HAN Xue;GAO Jipu;ZHANG Yuelang;LI Kun;JIANG Qian(Electric Power Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵州贵阳550005

出　　处：《电力大数据》2024年第12期63-74,共12页Power Systems and Big Data

摘　　要：该文选取一起500 kV变电站母线差动保护误动作事件作为研究案例,通过事故现场调查、故障模拟试验以及理论分析,全面探讨了二次回路两点接地导致保护误动作的机制。通过构建接地网等效模型并进行试验验证,该文精确量化了两点接地引起的感应电流大小及其对保护动作的影响范围。基于研究结果,文章提出了优化二次回路设计、规范作业流程的建议,旨在为电网的运行维护提供理论依据和实践指导。This paper selects a case of a 500 kV substation busbar differential protection misoperation as a research example.Through on-site investigation of the accident,fault simulation tests,and theoretical analysis,it comprehensively explores the mechanism of protection misoperation caused by two-point grounding in the secondary circuit.By constructing an equivalent model of the grounding grid and conducting experimental verification,this paper accurately quantifies the magnitude of the induced current caused by two-point grounding and its influence range on protection operation.Based on the research results,the paper proposes suggestions for optimizing the design of the secondary circuit and standardizing operation procedures,aiming to provide a theoretical basis and practical guidance for the operation and maintenance of power grids.

关 键 词：两点接地 感应电流 保护误动 接地网 

分 类 号：TM45[电气工程—电器]