电瓷避雷器Issue(5)：92-101,10.DOI:10.16188/j.isa.1003-8337.2025.05.012
±400kV环保型直流穿墙套管干燥空气绝缘性能研究
Dry Air Insulation Performance of±400 kV Environmentally Friendly DC Wall Bushing
摘要
Abstract
Ultra high voltage direct current(DC)wall bushings are commonly used SF6 as the main insu-lation medium,which is also the important component of high-voltage transmission systems.Nowadays,it is meaningful to find the alternative gases to replace SF6,the dry air used as an insulation medium in±400 kV DC wall bushings meets the development requirements for environmentally friendly high-volt-age electrical equipment.Firstly,the electrical simulation was conducted on the three-dimensional model of the wall bushing,which obtained the electric field and potential distribution.Based on the loca-tion and numerical of the maximum electric field strength inside the wall bushing,different electrode structures were designed.Meanwhile,different electrode structures were investigated under AC and DC voltages in the range of 0.5～1.0 MPa air pressure to study the breakdown characteristics of dry air.The results indicate that the breakdown voltage of dry air generally increases with increasing air pressure,and the saturation phenomenon occurs at higher pressures.Concerning simulation and experimental results,dry air at 0.9 MPa shows the potential as an internal insulation gas for environmentally friendly±400 kV wall bushings.关键词
干燥空气/绝缘性能/工频击穿试验/直流击穿试验/电场不均匀度/穿墙套管Key words
dry air/insulation performance/AC breakdown experiment/DC breakdown experiment/e-lectric field non-uniformity/wall bushing引用本文复制引用
钟建英,刘赛,柴影辉,杜帅,程显,魏建巍..±400kV环保型直流穿墙套管干燥空气绝缘性能研究[J].电瓷避雷器,2025,(5):92-101,10.基金项目
项目基金:平高集团科技项目(编号:PGKJ2021-005).Project support by Technology Project of PingGao Group Co.,Ltd.(No.PGKJ2021-005). （编号:PGKJ2021-005）
