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

• Published in: High voltage Vol. 5; no. 6; pp. 669 - 678
• Main Authors: Yang, Zhuodong, Li, Xuebao, Meng, Xiangrui, Zhao, Zhibin, Fu, Pengyu, Zhai, Bin, Cui, Xiang
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 01.12.2020; Wiley
• Subjects: backward discharge current pulses; Cavallini relaxation model; current pulse amplitude; decay process; dielectric relaxation; discharge process; discharge voltage ratio; fall time; forward discharge current pulses; nitrogen atmosphere; organic insulating materials; PEEK surface current pulses; polyetheretherketone material; polymers; positive repetitive square voltage; pulse width; repetitive cycles; Research Article; Richardson‐Schottky relaxation model; rise time; square voltage amplitude; statistical analysis; surface charge; surface charging; surface discharge characteristics; surface discharge current pulses; surface discharges; voltage frequency; surface discharge current pulses; backward discharge current pulses; Richardson-Schottky relaxation model; rise time; repetitive cycles; current pulse amplitude; organic insulating materials; discharge voltage ratio; square voltage amplitude; polymers; decay process; nitrogen atmosphere; surface discharges; forward discharge current pulses; dielectric relaxation; fall time; surface charging; pulse width; voltage frequency; discharge process; surface discharge characteristics; surface charge; positive repetitive square voltage; PEEK surface current pulses; statistical analysis; polyetheretherketone material; Cavallini relaxation model
• ISSN: 2397-7264; 2397-7264
• DOI: 10.1049/hve.2019.0292

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.