一起套管故障引起的500 kV变压器跳闸事故分析  

Analysis on 500 kV Auto-Transformer Tripping Accident Caused by Bushing Fault

作　　者：张旭 邳浚哲 ZHANG Xu;PI Junzhe(Extra High Voltage Branch of State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang,Heibei 050051,China)

机构地区：[1]国网河北省电力有限公司超高压分公司,河北石家庄050051

出　　处：《东北电力技术》2025年第1期17-20,24,共5页Northeast Electric Power Technology

摘　　要：针对某500 kV变电站一次中压侧套管故障引起的自耦变压器三侧断路器跳闸事故,结合站内保护跳闸报告及故障录波文件,对该次事故各保护动作行为正确性进行判别。对各TA电流相位进行对比,并计算差动电流、制动电流,分析确定故障点位置位于中压侧套管及套管故障点发展转移过程,并对变压器分侧差动保护不动作的原因进行详细分析,为相关技术人员提供自耦变压器中压侧近区故障的保护动作分析经验,提高电网运行管理水平。In view of the tripping accident of the auto-transformer three side caused by the bushing fault on the medium voltage side of an auto-transformer in a 500 kV substation,the correctness of each protection action related to this accident is evaluated in combination with the protection tripping report and fault recording files.Compare with the phase of each TA current,it calculates the differential current and braking current,analyzes and determine that the fault point is located in the bushing at the medium voltage side and the development process of the bushing fault point,and the reasons for the non action of the side differential protection are analyzed and described in detail.It provides relevant technicians with the analysis experience of the protection action of the near fault at the medium voltage side of the auto-transformer,and improves the power grid operation management level.

关 键 词：跳闸分析 分侧差动保护 自耦变压器 

分 类 号：TM407[电气工程—电器]