Investigation of electric field distribution on polymeric bushing using non-linear field grading materials

Aboshwerb, Mohamed, Albano, Maurizio ORCID: https://orcid.org/0000-0002-5486-4299 and Haddad, Manu ORCID: https://orcid.org/0000-0003-4153-6146 2024. Investigation of electric field distribution on polymeric bushing using non-linear field grading materials. Presented at: 23rd International Symposium on High Voltage Engineering (ISH 2023), Glasgow, UK, 28 August - 1 September 2023. IET Conference Proceedings. , vol.2023 (46) pp. 318-323. 10.1049/icp.2024.0514

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Abstract

This study investigated nonlinear resistive field grading material based on a ZnO microvaristor to optimize the distribution of the electric field along with a 36 kV composite bushing surface. In this work, we consider some parameters that influence nonlinear resistive field grading material properties such as different shapes of microvaristor layer design, switching parameters of field grading material including initial conductivity, non-linearity coefficient, and field switching threshold on the field distribution. A suitable design of field grading material has been proposed for effective stress control near the flange ground terminal. A polymeric bushing with field grading material has been proposed to evaluate some parameters using 2D axisymmetric models in COMSOL Multiphysics. Electric field enhancements at the triple junction points near the flange ground terminal are successfully suppressed. This consequently reduces the probability of corona and electric surface discharges, minimizes the possibility of dry bands formation, raises the flashover voltage, and may improve the long-term operation of the polymeric bushing in service.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Engineering
Last Modified:	21 Nov 2024 11:54
URI:	https://orca.cardiff.ac.uk/id/eprint/174201

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