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Callender, G.
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Measuring and simulating partial discharge activity in a spherical cavity during electrical ageing processes
Abstract
<p>This paper considers partial discharge (PD) activity in an air-filled cavity under accelerated ageing condition. During ageing, PDs in the cavity bombard the inner cavity surface with charged particles leading to surface erosion and eventually complete failure. The time-evolution of phase-resolved partial discharge (PRPD) pattern demonstrates evidence of the formation of an eroded hole. Analysis of PD statistical quantities for distinct patterns is obtained in terms of apparent charge and the number of PDs per cycle. The physical parameters of the test sample such as the cavity radius, the material thickness, the applied voltage and the relative permittivity are used to implement a Finite Element Analysis (FEA) model, which is used to develop a PD model. The simulated PD behavior was analyzed in terms of PRPD patterns and statistical quantities in order to make a comparison with measurement results.</p>