变压器铁芯接地不良导致的合闸过电压事故分析  

Analysis of Closing Overvoltage Caused by Poor Grounding of Transformer Core

作　　者：庞泽 刘守豹 韦昌伟 黄朝捍 PANG Ze;LIU Shoubao;WEI Changwei;HUANG Chaohan(Datang Hydropower Science&Technology Research Institute Co.,Ltd.,Guangxi Nanning 530007 China;Hengxian Jiangnan Power Generation Co.,Ltd.,Guangxi Nanning 530300,China)

机构地区：[1]大唐水电科学技术研究院有限公司,广西南宁530007 [2]横县江南发电有限公司,广西南宁530300

出　　处：《广西电力》2021年第6期82-86,共5页Guangxi Electric Power

摘　　要：本文针对某水力发电厂一起220 kV主变铁芯接地不良导致充电过程中电弧放电和低压侧避雷器损坏的事故,采用电磁暂态分析软件ATP—EMTP进行了仿真计算,定量分析了合闸过程中的铁芯电压异常情况,为指导变压器铁芯接地不良事故分析和处理提供了借鉴。In order to look into an accident in a hydropower plant in which the poor grounding of the 220 kV main transformer iron core caused the arc discharge and damage to the low-voltage side arrester during the charging process,simulation was carried out using the electromagnetic transient analysis software ATP-EMTP.The abnormal core voltage during the closing process is quantitatively analyzed and provides a reference point for the analysis and treatment of accidents caused by poor grounding of the transformer core.

关 键 词：变压器 铁芯 避雷器 接地 对地电容 电磁暂态 

分 类 号：TM83[电气工程—高电压与绝缘技术]