On the arc-resistance when tested with DC- and AC-stress by the example of silicone elastomers

Kühnel, Samantha; Kornhuber, Stefan; Bärsch, R.; Lambrecht, Jens

doi:10.1109/ceidp.2016.7785531

Cited by 3 publications

(1 citation statement)

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“…Further rigorous investigations of the mechanisms that cause reproducible deep erosion under a DC voltage relative to the AC voltage are ongoing. Numerous analytical techniques, including statistical analysis of the leakage current, frequency analysis of dry band arcing energy, thermal imaging and arc mobility studies, have been employed to determine possible erosion indicators [17][18][19][20][21]. Results of these studies suggest that there are many different variables which contribute to the overall material degradation [14].…”

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confidence: 99%

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

2021

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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.

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