Evaluation of Erosion Discharge Characteristics in Inclined Plane Tracking and Erosion Tests on Silicone Rubber under AC and DC Voltages

Valeria Pevtsov, Nathan D. Jacob and Behzad Kordi
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Valeria Pevtsov: Manitoba Hydro High Voltage Test Facility, Winnipeg, MB R3T 1Y6, Canada
Nathan D. Jacob: Manitoba Hydro High Voltage Test Facility, Winnipeg, MB R3T 1Y6, Canada
Behzad Kordi: Department of Electrical & Computer Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada

Energies, 2021, vol. 14, issue 19, 1-19

Abstract: This paper investigates partial discharge (PD) characteristics that lead to the erosion of silicone rubber (SR) polymer under AC stress and DC stress of both polarities. The experiments are performed on high temperature vulcanized (HTV) SR material samples. The inclined plane test apparatus, constructed in accordance with IEC 60587 requirements, is employed to produce the surface partial discharges and the resulting accelerated aging of the specimens. Two commercial instruments are used to obtain the PD data. A concurrent analysis of visual observations of discharge and PD data is performed to classify discharges based on the severity of material degradation that each type causes. Three types of PD are identified and characterized using diagrams of charge magnitude versus time and a signal processing technique called time-frequency mapping. Individual pulse waveshapes of each type of discharge are also analyzed. PD pulse waveforms are analyzed according to their amplitude, energy, pulse width, and frequency spectrum. These pulse waveform parameters are evaluated and compared for the eroding discharge pulses under AC and DC voltage stresses. It is found that the stages of material degradation during IPT are related to the variations in discharge magnitude and the location of pulse clusters on the time-frequency maps.

Keywords: polymer insulator; inclined plane test; partial discharge; silicone rubber; erosion; time-frequency map (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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