Analysis of degradation mechanisms of silicone insulation containing a spherical cavity using partial discharge detection

Tanmaneeprasert, Thanarat, Lewin, Paul and Callender, George (2017) Analysis of degradation mechanisms of silicone insulation containing a spherical cavity using partial discharge detection. In 2017 IEEE Electrical Insulation Conference (EIC). IEEE. pp. 233-236 . (doi:10.1109/EIC.2017.8004633).

Record type: Conference or Workshop Item (Paper)

Abstract

An investigation of surface erosion to complete failure of a gas-filled cavity embedded in a polymeric sample was experimentally undertaken to clarify the time-evolution of partial discharge (PD) behavior. During electrical ageing tests, analysis of phase-resolved partial discharge (PRPD) patterns can be distinguished into four stages: surface erosion, tree growth, surface discharges prior to failure and complete failure. A PD model was found to be able to match the variation of measured PRPD shapes and PD statistical quantities for turtle-like shapes, wing-like shapes, rabbit-like shapes and swarming pulsive micro-discharge (SPMD) mechanisms [1]. Morphological changes on the cavity surface were closely examined to determine the failure mechanism.

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