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Simulation and Analysis of Electric Field Distributions in Stator Bar Insulation System with Different Arrangement of Cavities

Chee, Daphne Tay Ye; Mehranzamir, Kamyar; Nabipour-Afrouzi, Hadi; Ahmed, Jubaer; Malek, Zulkurnain Abdul; Kieh, Tiong Siing


Daphne Tay Ye Chee

Kamyar Mehranzamir

Hadi Nabipour-Afrouzi

Zulkurnain Abdul Malek

Tiong Siing Kieh


The underlying cause of the cessation in high voltage machineries can be rooted from the failure in the insulation system due to cavity's discharges originating from the presence of cavities. This paper caters to the study of the electric field distribution inside stator bar insulation system with different arrangement of cavities, in either single or multiple cavities of different alignment to aid the investigation of electric field stresses inside the cavities and the tendency of electrical breakdown in the stator bar insulation system. Simulation using Finite Element Method (FEM) with the assistance of COMSOL software is being carried out for this 2-Dimensional stator bar insulation modelling. A 10kV stator bar insulation system is modelled in 2 dimensions to analyse the electric field distribution under different arrangements of cavities. The simulation results show that the randomly distributed cavities aligned in vertical direction constitutes a greatest upsurge of electric field stress by 85% while horizontally aligned cavities that are 0.7mm apart instigates only 46.2% increase in electric field stress within the cavity. This affirms that the arrangement of cavities poses an influence over the electric field distribution inside stator bar insulation system.

Presentation Conference Type Conference Paper (Published)
Conference Name 2019 International UNIMAS STEM 12th Engineering Conference (EnCon)
Start Date Aug 28, 2019
End Date Aug 29, 2019
Online Publication Date Jan 9, 2020
Publication Date 2020
Deposit Date Dec 28, 2021
Publisher Institute of Electrical and Electronics Engineers
Book Title 2019 International UNIMAS STEM 12th Engineering Conference (EnCon)
Keywords Stator bar insulation, relative permittivity, arrangement of cavities, electric field distribution, electric field stress, COMSOL, FEM
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