Effect of Insulating Gases on Electrical Treeing in Epoxy Resin

被引:0
|
作者
Han, Qinghua [1 ]
Iddrissu, Ibrahim [1 ]
Chen, Lujia [1 ]
Rowland, Simon [1 ]
机构
[1] Univ Manchester, Dept Elect & Elect Engn, Manchester M13 9PL, England
基金
英国工程与自然科学研究理事会;
关键词
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Electrical trees initiated from defects in solid insulation are one of the main causes of cable insulation failure. Both the initiation and propagation of electrical trees are linked to PD activity in the free volume and interfaces between electrode, gaseous and solid dielectrics. This work investigates the potential of suppressing partial discharge (PD) during tree propagation by displacing air with a higher electron affinity gas. Epoxy resin samples with pre-existing trees were energized under 7 kVrms in atmospheric air and SF6 under 2 bar absolute for 3 hours. PD measurements indicate that the permeation of SF6 into the epoxy sample could significantly reduce the discharge energy and lead to a reduced number of discharges. However, the tree length growth was comparable for both gases. This is attributed to offsetting of reduced PD energy by SF6 within the tree channels and subsequent reaction between gas by-products and the epoxy.
引用
收藏
页码:482 / 485
页数:4
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