一起500kV换流变乙炔异常增长案例的分析及处理  

Analysis and Treatment of Acetylene Abnormal Growth of±500kV Converter Transformer

作　　者：陈宇 符劲松 肖佩 董凯 CHEN Yu;FU Jinsong;XIAO Pei;DONG Kai(Substation Intelligent Transportation and Inspection Laboratory of State Grid Hunan Electric Power Co.,Ltd.,Changsha 410000,China;State Grid Hunan Ultra-High Voltage Substation Company,Changsha 410000,China)

机构地区：[1]变电智能运检国网湖南省电力有限公司实验室,湖南长沙410000 [2]国网湖南超高压变电公司,湖南长沙410000

出　　处：《变压器》2025年第3期13-17,共5页Transformer

基　　金：国网湖南省电力有限公司小荷人才项目“基于运行工况的换流变现场负载试验方法研究”(5216A324000T)。

摘　　要：本文中作者介绍了某±500kV换流站换流变在运行过程中,换流变本体油中乙炔、总烃含量异常增长的故障案例。通过在线/离线油色谱取样分析,根据三比值法初步判断存在电弧放电现象,但局放试验暂无明显异常。经解体检查,结合放电痕迹、设备结构,发现带电运行中,由电流负荷感应的电动力引起CT升高座震动,导致拉螺杆螺牙脱离法兰连接盲孔从而局部放电。In this paper,a fault case of abnormal increase of acetylene and total hydrocarbon content in the converter body oil of a±5ookV converter station converter during operation is presented by ths authors.Through online/offline oil chromatography sampling and analysis,according to the three-ratio method of preliminary judgment there is an arc discharge phenomenon,but the local discharge test for the time being no obvious abnormality.After disassembling and checking,combined with discharge traces and equipment structure,it is found that during the charged operation,the electric force induced by the current load caused the cT elevated seat vibration,resulting in the pulling screw threads detached from the flange coupling blind holes and thus localized discharges.

关 键 词：换流变压器 乙炔 油色谱 故障诊断 

分 类 号：TM407[电气工程—电器]