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

This is an open access article published by the IET and CEPRI under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 16/10/2019, Accepted 06/05/2020, Revised 18/02/2020, Published 07/05/2020

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.

Inspec keywords: polymers; surface discharges; dielectric relaxation; organic insulating materials; surface charging

Other keywords: discharge process; positive repetitive square voltage; surface discharge current pulses; decay process; discharge voltage ratio; surface discharge characteristics; backward discharge current pulses; current pulse amplitude; pulse width; rise time; nitrogen atmosphere; fall time; surface charge; square voltage amplitude; polyetheretherketone material; statistical analysis; forward discharge current pulses; PEEK surface current pulses; voltage frequency; Cavallini relaxation model; Richardson-Schottky relaxation model; repetitive cycles

Subjects: Organic insulation; Dielectric breakdown and discharges; Dielectric loss and relaxation

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