Calculation of Electric Field in Safety Film Capacitors

被引:13
作者
Peng, Bo [1 ]
Lin, Fuchang [1 ]
Li, Hua [1 ]
Dai, Ling [1 ]
Chen, Yaohong [1 ]
Han, Yongxia [1 ]
机构
[1] Huazhong Univ Sci & Technol, Coll Elect & Elect Engn, Wuhan 430074, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
Safety film capacitors; failure mechanism; electric field distortion range (EFDR);
D O I
10.1109/TDEI.2009.5128530
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
The failure mechanism of a safety film capacitor is a little different from that of an all-film capacitor. Experiments were carried out on a number of safety film pulse capacitors. A careful examination is made of the capacitor film after discharge. It is found that the failure of the capacitor comes from the capacitance loss, which is caused by the partial discharge (PD) at the edge of the segment electrode. The electric field is calculated in the paper and the results show that the electric field distortion is the main reason for PD at the edge of electrodes. The paper uses the electric field distortion range (EFDR) to review the influences of thickness of electrode, thickness of film and reversal coefficient of discharge voltage on PD at the edge of electrodes. As a result, the EFDR will be more intense and the PD at the edge of electrode will be more obvious if the electrode is thinner, the film is thicker or the amplitude of reversal coefficient of discharge voltage is higher. And when there is free surface charge on the film near the electrode, the PD will be more serious.
引用
收藏
页码:882 / 886
页数:5
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