特高压换流变压器阀侧升高座区域弹性电接触部件电阻异常原因分析  

Causes of Abnormal Resistance of Electrical Contact Elements in Valve Side Ascending Flange of UHV Converter Transformer

作　　者：段昊 汤浩 刘凯[3] 李熙宁 林牧 程华润 DUAN Hao;TANG Hao;LIU Kai;LI Xining;LIN Mu;CHENG Huarun(State Grid Corporation of China,Xicheng District,Beijing 100031,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan Province,China)

机构地区：[1]国家电网有限公司,北京市西城区100031 [2]中国电力科学研究院有限公司,北京市海淀区100192 [3]西南交通大学电气工程学院,四川省成都市611756

出　　处：《电网技术》2023年第11期4810-4819,共10页Power System Technology

基　　金：国家电网公司科技项目(GY71-22-022)。

摘　　要：特高压直流输电技术在我国发展迅速,成果斐然,是目前解决远距离能源资源与能源需求逆向分布问题的最优方案之一,而换流变压器是特高压直流输电工程中的关键设备,其阀侧升高座区域更是关系电力系统安全可靠运行的重点区域。该文针对某换流站年检过程中出现的换流变压器阀侧电阻异常超标故障,通过热态电阻测试、扫描电镜(scanning electron microscope,SEM)、以及能量色散光谱仪(energy dispersive spectrometer,EDS)、X射线衍射仪(X-ray diffrac-tometer,XRD)分析,对阀侧升高座区域内表带触指的电阻超标原因进行了探究。并建立换流变压器阀侧套管以及套管尾部插头的三维电热仿真模型,计算了表带触指的电阻分布情况对于该区域温度分布的影响,进一步验证了特高压换流变压器阀侧升高座区域内表带触指的腐蚀劣化原因。研究结果可以为换流变压器阀侧升高座区域电阻超标故障修复方案的制定提供理论参考,也为今后适用于特高压大电流的电连接器国产化提供了理论指引和工程参照。UHVDC transmission technology has developed rapidly in China and achieved remarkable achievements.It is one of the best solutions to solve the problem of the reverse distribution of long-distance energy resources and energy demands.As the key equipment in the UHVDC transmission projects,the valve side ascending flange of the converter transformer is the key area related to the safe and reliable operation of the power system.Aiming at the over-standard fault of the DC resistance of the converter valve side during the annual inspection of a converter station,the causes of the over-standard resistance of the elastic electrical contact components in the valve side ascending flange are explored through the thermal resistance test,the scanning electron microscope(SEM),the energy dispersive spectrometer(EDS)and the X-ray diffractometer(XRD)in this paper.A three-dimensional temperature simulation model of the bushing on the converter valve side and its tail plug is established,and the influence of the resistance distribution of the contact strip on the temperature distribution in this area is calculated,further verifying the causes of the contact deterioration of the elastic electrical contact components in the valve side ascending flange of the UHV converter.The research results may provide a theoretical reference for the repairing scheme of the abnormal resistance fault in the valve side ascending flange,and also give a theoretical guidance and engineering reference for the localization of electrical connectors suitable for the high voltage and high current in the future.

关 键 词：换流变压器 阀侧升高座 表带触指 接触电阻 

分 类 号：TM721[电气工程—电力系统及自动化]