Understanding insulation failure of nanodielectrics:tailoring carrier energy  

作　　者：Shengtao Li Dongri Xie Qingquan Lei 

机构地区：[1]State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an,People's Republic of China [2]College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao,People's Republic of China [3]School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin,People's Republic of China

出　　处：《High Voltage》2020年第6期643-649,共7页高电压（英文）

基　　金：the National Basic Research Program of China(973 Program)under Project with NO.2015CB251003;the National Key Research and Development Program of China under Project with NO.2017YFB0902702;the National Natural Science Foundation of China(NSFC)under Project with NO.51337008.

摘　　要：Owing to the formation of interface and new feature of which, the properties of nanodielectrics can be improved. ‘Hard/soft interface’ and its trap distribution can be tailored by functionalised groups. Molecular simulation results show that the interaction energy and electrostatic potential are larger for the soft interface, which indicates the greater bonding strength with the polymer matrix and electrostatic force on charge carriers. Charge transport simulation indicates that the accumulation of homo-charges would form a reverse electric field and distort electric field distribution. The injection depth would be restricted at the vicinity of sample/electrodes due to the greater trapping effect of deep traps, thus weakening the distortion in the sample bulk, thereby decreasing carrier energy and delaying the formation of impact ionisation. Based on the accumulation of carrier energy Φ = Eeλ, the idea of suppressing electron free path and carrier energy to enhance the insulation breakdown is confirmed. The classified effects of nanofillers during dc breakdown and corona-resistant are further understood from carrier energy. The introduced interfacial trap is effective in trapping carriers due to the low carrier energy under dc voltage, while ineffective in blocking the energetic charges during corona-discharge, but nanoparticles exert blocking and scattering effect against the energetic charges.

关 键 词：ENERGY TRAPPING INTERFACE 

分 类 号：TM21[一般工业技术—材料科学与工程]