变压器分闸对铁心剩磁的影响研究  

Research on the impact of transformer switching-off on core residual magnetism

作　　者：韩霄 陈浩天 周佳 陈卫[1] 陈德树[1] HAN Xiao;CHEN Haotian;ZHOU Jia;CHEN Wei;CHEN Deshu(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Dongguan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Dongguan 523009,China)

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074 [2]广东电网有限责任公司东莞供电局,东莞523009

出　　处：《浙江电力》2025年第2期103-109,共7页Zhejiang Electric Power

基　　金：南方电网公司科技项目(031900KC23070040)。

摘　　要：变压器空载合闸励磁涌流对电网运行产生诸多问题,以相控合闸为代表的涌流抑制技术可以消除其影响,而相控合闸实现的关键因素是变压器铁心剩磁的测量。为此,针对变压器分闸对铁心剩磁的影响问题展开研究。首先,基于变压器分闸回路,估算变压器分闸截流过电压,定性地研究其对铁心剩磁的影响;然后,结合J-A磁滞仿真,探究变压器铁心剩磁与分闸角的关系及分闸后铁心磁通的变化轨迹;最后,采用变压器剩磁定量测量,得出了变压器实际剩磁的演化规律,并对前述的理论分析及仿真探究结果进行了验证。Magnetizing inrush current caused by transformer no-load switching can lead to various issues in power grid operations.Techniques such as phase-controlled switching are effective in mitigating these effects,with the key factor being the measurement of the transformer core’s residual magnetism.This paper investigates the impact of transformer switching-off on core residual magnetism.First,based on the transformer switching-off circuit,the switching-off interruption overvoltage is estimated,and its qualitative impact on core residual magnetism is ana⁃lyzed.Next,using J-A hysteresis simulation,the relationship between transformer core residual magnetism and switching-off angle,as well as the magnetic flux trajectory after switching-off,is explored.Finally,quantitative mea⁃surement of the transformer’s residual magnetism is conducted,revealing the evolution patterns of actual residual magnetism.The theoretical analysis and simulation-based findings are validated.

关 键 词：变压器励磁涌流 剩磁 截流过电压 励磁涌流抑制 空载合闸 

分 类 号：TM40[电气工程—电器]