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

Abstract

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.

Citation

Chee, D. T. Y., Mehranzamir, K., Nabipour-Afrouzi, H., Ahmed, J., Malek, Z. A., & Kieh, T. S. (2020). Simulation and Analysis of Electric Field Distributions in Stator Bar Insulation System with Different Arrangement of Cavities. In 2019 International UNIMAS STEM 12th Engineering Conference (EnCon). https://doi.org/10.1109/EnCon.2019.8861258

• Conference Name: 2019 International UNIMAS STEM 12th Engineering Conference (EnCon)
• Conference Location: Kuching, Malaysia
• 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)
• DOI: https://doi.org/10.1109/EnCon.2019.8861258
• Keywords: Stator bar insulation, relative permittivity, arrangement of cavities, electric field distribution, electric field stress, COMSOL, FEM
• Public URL: http://researchrepository.napier.ac.uk/Output/2823368