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The Impact of Cavity Size on Electric Field Distribution and PD Inception Voltage in Epoxy-resin Insulation

Aliyu, B. D.; Rohani, Mohamad N. K. H.; Musa, U.; Jibril, Y.; Sulaiman, S. H.; Mas'ud, A. A.; Muhammad-Sukki, Firdaus

Authors

B. D. Aliyu

Mohamad N. K. H. Rohani

U. Musa

Y. Jibril

S. H. Sulaiman

A. A. Mas'ud



Abstract

Cavities in insulation systems of active high voltage (HV) equipment affect their performance, reliability and useful life periods. Cavities serves as flash points for enhanced field activity leading to ageing from partial discharge (PD) events and subsequent breakdown of the insulation material. In this paper, the impact of cavity diameter on the electric field distribution as well as PD inception voltage is investigated in an Epoxy-resin insulation sample. A 3D adequate model of the sample with a spherical cavity was created and simulated in COMSOL for different cavity sizes and applied voltage stresses respectively. The simulation results indicate that the both field distribution and the PD inception voltages are strongly influenced by cavity size as well as the applied voltage magnitude. The electric field intensity was observed to be higher in cavities with smaller diameter relative to the insulation bulk, while the inception voltage decreases with increase in the cavity diameter and vice-versa.

Presentation Conference Type Conference Paper (Published)
Conference Name 2023 IEEE 3rd International Conference in Power Engineering Applications (ICPEA)
Start Date Mar 6, 2023
End Date Mar 7, 2023
Acceptance Date Jan 14, 2023
Online Publication Date Apr 10, 2023
Publication Date 2023
Deposit Date Jan 16, 2023
Publicly Available Date Apr 10, 2023
Publisher Institute of Electrical and Electronics Engineers
Book Title 2023 IEEE 3rd International Conference in Power Engineering Applications (ICPEA)
DOI https://doi.org/10.1109/ICPEA56918.2023.10093169
Keywords Electric Field; COMSOL Multi-physics; Finite Element Analysis; Inception Voltage; Epoxy-resin Insulation

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The Impact Of Cavity Size On Electric Field Distribution And PD Inception Voltage In Epoxy- Resin Insulation (accepted version) (442 Kb)
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