高电压技术2026，Vol.52Issue(5)：2086-2100,15.DOI:10.13336/j.1003-6520.hve.20251005
换流变阀侧套管环氧浸纸芯体模型气-固界面电荷积聚特性
Charge Accumulation Characteristics of Gas-solid Interface in Glue-impregnated Paper Core Model of Valve-side Bushing of Converter Transformer
摘要
Abstract
The valve-side bushing of ultra-high voltage(UHV)converter transformers is a key component in DC power transmission systems,playing a critical role in ensuring the safe and stable operation of the power grid.However,in re-cent years,surface flashover failures have frequently occurred at the SF6-solid insulation interface of valve-side bushings,and the surface charge distribution at this interface directly affects insulation performance.Therefore,understanding the charge accumulation characteristics at the SF6-solid interface is essential for maintaining the safe and stable operation of valve-side bushings.In this study,a charge measurement system was developed to assess the gas-solid interface of a scaled epoxy-impregnated paper model of a valve-side bushing.Surface charge distributions were measured under DC voltage in an SF6 environment,including both short-term and long-term behaviors.Experimental results reveal that two charge distribution patterns appear under DC voltage,namely,a fundamental pattern determined by the bushing structure,and a unipolar spot pattern influenced by surface conditions.Finally,simulation analysis was conducted to investigate the effects of solid current,gas current,and surface current components on surface charge accumulation.It is concluded that the surface current components is the main influencing factor of the core model surface charge accumulation.关键词
阀侧套管/环氧浸纸芯体/气固界面/反演/表面电荷积聚Key words
valve-side bushing/epoxy impregnated paper core/gas-solid interface/inversion algorithm/surface charge accumulation引用本文复制引用
李杨,王青于,史石峰,刘鹏,彭宗仁,刘智..换流变阀侧套管环氧浸纸芯体模型气-固界面电荷积聚特性[J].高电压技术,2026,52(5):2086-2100,15.基金项目
国家自然科学基金(U25B20195).Project supported by National Natural Science Foundation of China(U25B20195). （U25B20195）
