Influence of N_(2)pressure on surface discharge characteristics of PEEK under positive repetitive square voltage  

作　　者：Ye Li Xuebao Li Wei Meng Zhibin Zhao Xiang Cui 

机构地区：[1]State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing,China

出　　处：《High Voltage》2021年第5期793-804,共12页高电压（英文）

基　　金：supported by National Natural Science Foundation of China-State Grid Corporation Joint Fund for Smart Grid under Grant U1766219。

摘　　要：PEEK(polyetheretherketone)and N_(2)are used in the packaging of high‐voltage power electronics as the frame material and insulation gas,respectively.The surface discharge behaviours of PEEK in N_(2)under positive repetitive square voltage are the main concerns for the packaging insulation design.However,the influence of N_(2)pressure on discharge characteristics and mechanisms has not been investigated.Herein,the optical images of streamer propagation and surface discharge current pulses of PEEK in N_(2)with different pressures are obtained under positive repetitive square voltage.The effects of different N_(2)pressures on the surface discharge initial voltage(SDIV),pulse parameters of discharge current,time lag of discharge and streamer propagation length are analysed in detail.The effects of N_(2)pressure on the memory effects of residual charges during surface discharge,effective ionisation rate and electron desorption rate are revealed.Furthermore,the time lag theory is used to analyse the influence of N_(2)pressure on the time lag of forward and backward discharge.The effects of N_(2)pressure on pulse pa-rameters of discharge current,surface discharge initial voltage and streamer propagation length are also explained on the basis of the process of surface charges accumulation under different N_(2)pressures.The presented results can provide guidance for the pack-aging of press pack IGBT(insulated gate bipolar transistor)and reveal the surface discharge mechanism with different N_(2)pressures under positive repetitive square voltage.

关 键 词：BIPOLAR surface CHARACTERISTICS 

分 类 号：TM21[一般工业技术—材料科学与工程]