Influence of frequency on the surface discharge characteristics of PEEK under positive repetitive square voltage  

作　　者：Zhuodong Yang Xuebao Li Xiangrui Meng Zhibin Zhao Pengyu Fu Bin Zhai 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 102206,People's Republic of China

出　　处：《High Voltage》2020年第6期669-678,共10页高电压（英文）

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

摘　　要：In this study, the surface discharge current pulses of polyetheretherketone (PEEK) material under positive repetitive square voltage in a nitrogen atmosphere are measured. The influences of different voltage amplitudes and frequencies on the detail parameters of forward discharge and backward discharge current pulses are statistically analysed. The results show that as the square voltage amplitude increases, the current pulse amplitude, fall time and pulse width of both forward and backward discharge current increase, and the rise time does not change significantly. As the voltage frequency increases, current pulse amplitude, fall time and pulse width of both forward and backward discharge current decrease, and the rise time does not change significantly. Due to the independence of the discharge at different repetitive cycles, the specific discharge process in one cycle is analysed in detail to explain the influence mechanism of the voltage amplitude and frequency on the discharge current. By mean of the Richardson-Schottky and the Cavallini relaxation model, the relationship between discharge voltage ratio and surface charge, and the decay process of surface discharge are analysed. Furthermore, the influences of amplitude and frequency of the positive repetitive square voltage on the PEEK surface current pulses are explained qualitatively.

关 键 词：SURFACE BACKWARD POSITIVE 

分 类 号：TM85[电气工程—高电压与绝缘技术]