关键词: 环氧纳米复合电介质/
交互区/
陷阱/
空间电荷
English Abstract
Influence of filler content on trap and space charge properties of epoxy resin nanocomposites
Yuan Duan-Lei1,Min Dao-Min2,
Huang Yin2,
Xie Dong-Ri2,
Wang Hai-Yan1,
Yang Fang1,
Zhu Zhi-Hao1,
Fei Xiang1,
Li Sheng-Tao2
1.Pinggao Group Co. LTD., Pingdingshan 467001, China;
2.State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
Fund Project:Project supported by the National Basic Research Program of China (Grant No. 2015CB251003), the National Natural Science Foundation of China (Grant No. 51507124), the Open Fund Project of State Key Laboratory of Power System of Tsinghua University, China (Grant No. SKLD16KZ04), the China Postdoctoral Science Foundation (Grant No. 2014M552449), the Fundamental Research Fund for the Central Universities, China (Grant No. xjj2014022), and the Program for New Teacher of Xi'an Jiaotong University, China (Grant No. DWSQc130000008).Received Date:29 November 2016
Accepted Date:31 January 2017
Published Online:05 May 2017
Abstract:Epoxy resin nanocomposites have excellent properties such as the suppression of space charge accumulation, high resistivity, and high electrical breakdown strength, which play an important role in developing the direct current power equipment. However, the influencing mechanisms of filler content on trap, conductivity, and space charge of nanocomposites have not been clear to date. In the present paper, a method to calculate the densities of shallow traps and deep traps in interaction zones is proposed based on the multi-region structure model of interaction zones, and the dependence of shallow traps and deep traps on filler content is obtained. It is found that the shallow trap density increases with the increase of filler content, while the deep trap density first increases and then decreases with increasing the filler content, which is caused by the overlap of interaction zones. Then, the relation between the shallow trap controlled carrier mobility and the filler content is investigated. With the filler content increasing, the density of shallow traps increases and their mean distance decreases, leading to an increase in the shallow trap controlled carrier mobility.Considering the charge injection from cathode into dielectrics, carrier hopping in shallow traps, charge trapping into and detrapping from deep traps, a unipolar charge transport model is established to study the conductivity and distributions of space charges and electric field in epoxy resin nanocomposites. At relatively low filler content, the charge transport is dominated by deep traps in interaction zones and the conductivity decreases with the increase of filler content. However, the charge transport is determined by shallow traps at relatively high filler content and the conductivity increases.
Keywords: epoxy resin nanocomposite/
interaction zone/
trap/
space charge
