高电压技术2017，Vol.43Issue(8)：2754-2759,6.DOI:10.13336/j.1003-6520.hve.20170731042
SF6气体中氧化铝掺杂环氧树脂直流沿面闪络中的虫孔效应
Wormholes Effect in DC Flashover Process of Alumina Filled Epoxy Resin Surfaces in SF6
李武峰 1李鹏 2李金忠 1秦逸帆 2刘轩东 1张乔根2
作者信息
- 1. 西安交通大学电力设备电气绝缘国家重点实验室,西安710049
- 2. 中国电力科学研究院,北京100192
- 折叠
摘要
Abstract
In order to study the DC flashover characteristics in SF6 of alumina filled epoxy resin,which is one of the important insulating materials,DC flashover voltage test system is established.The short-term and long-term withstand voltages of epoxy resin samples with various alumina contents (mass ratio range of epoxy resin and alumina is from 2.5 to 4.0) in 0.4 MPa SF6,as well as the voltage application times were measured,and then the U-t characteristics were compared accordingly.The damages of the discharge process to alumina filled epoxy resin materials were also studied through the flashover traces and the microcosmic structure analysis.The "wormholes" formation in the discharge and its effect in the flashover process were analyzed and discussed.It is found that the withstand voltage of the epoxy resin with certain alumina content decreases exponentially with time,and the long-term withstand voltages is about 20％～30％ lower than the short-term withstand voltage.The epoxy resin sample with mass ratio of 3.5 has the lowest short-term and long-term withstand voltages and most serious carbonizations according to the experimental results.Wormholes are obviously found in the surface flashover path,and the superficial zone wormholes gradually transform into deep layer wormholes,which indicate that the flashover paths shift from creeping-discharge-based to bulk-breakdown-based due to wormholes effect with the increase of alumina content and the critical mass ratio of epoxy resin and alumina is about 3.0～3.5.关键词
SF6气体/环氧树脂/氧化铝/直流耐受电压/沿面闪络/体击穿/虫孔效应Key words
SF6 gas/epoxy resin/Al2O3/DC withstand voltage/flashover/bulk-breakdown/wormhole effect引用本文复制引用
李武峰,李鹏,李金忠,秦逸帆,刘轩东,张乔根..SF6气体中氧化铝掺杂环氧树脂直流沿面闪络中的虫孔效应[J].高电压技术,2017,43(8):2754-2759,6.
