高电压技术2023，Vol.49Issue(12)：4948-4959,12.DOI:10.13336/j.1003-6520.hve.20221629
±800 kV换流变压器阀侧套管表带触指型电连接结构地震响应分析
Seismic Response Analysis on Multilam Electrical-connection Structure Used in Valve-side Bushings of the ±800 kV Converter Transformer
摘要
Abstract
In recent years,there have been many overheat and discharge faults caused by the failure of the electri-cal-connection structure(ECS)at home and abroad.In order to explore the seismic response of the Multilam ECS,a finite element model of a±800 kV converter transformer with the Multilam ECS was established,and the dynamic contact re-sponse under the earthquake was analyzed.Based on the numerical calculation model of contact resistance,the three-level failure index of louvers of Multilam contact elements was proposed,and the distribution feature and causes of the high failure-risk louvers were summarized,so as to further reveal the failure mechanism of the ECS under earthquake.The re-sults show that,under normal working conditions,the method that sleeve on the valve side is installed by the inclined cantilever is adopted,thus its own weight will cause the electrical connection structure at the tail to be unable to fully align and the contact fingers of the watch strap to be unevenly compressed,and new contact areas will appear at the end of the connecting male head.Under the influence of earthquakes,the risk of failure of the contact finger blades in the three main positions of the watch strap is highest,and the resistance of the electrical connection structure significantly in-creases compared to normal working conditions and remains at a high level.The results of the dynamic time history analysis indicate that,there is an undeniable risk of seismic failure in the contact finger type electrical connection struc-ture of the watch strap,and the change in contact force between the contact finger blades caused by the relative motion between the connecting male and female heads is the main reason for its failure.The conclusions can provide basis for the design and selection of the ECS of valve-side bushings and analysis of overheating fault.关键词
表带触指/地震响应/电连接结构/失效机理/阀侧套管/特高压Key words
multilam/seismic response/electrical-connection structure/failure mechanism/valve-side bushing/UHV引用本文复制引用
谢强,陈云龙,毛宝俊,李晓璇..±800 kV换流变压器阀侧套管表带触指型电连接结构地震响应分析[J].高电压技术,2023,49(12):4948-4959,12.基金项目
国家自然科学基金(51878508) （51878508）
国家重点研发计划(2018YFC0809400).Project supported by National Natural Science Foundation of China(51878508),National Key R&D Program of China(2018YFC0809400). （2018YFC0809400）
