Optimization of Electric Field Distribution for 33kV Polymeric Insulator Using Non-linear Field Grading Composites

Halloum, MR and Subba Reddy, B and Razouk, Y (2021) Optimization of Electric Field Distribution for 33kV Polymeric Insulator Using Non-linear Field Grading Composites. In: 5th International Conference on Condition Assessment Techniques in Electrical Systems, 3-5 Dec 2021, Kozhikode, pp. 292-297.

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Abstract

This study investigates non-linear resistive field grading composites based on Zinc Oxide microvaristors to optimize the distribution of the electric field along a 33 kV composite insulator. In this study, the effect of different switching parameters of field grading composites such as field switching threshold, non-linearity coefficient, and the initial conductivity on the field distribution is presented. A suitable design of field grading composites is proposed for effective stress control near end-fittings and along the insulator surface. The proposed graded insulator is evaluated with the optimized switching parameters using COMSOL Multiphysics 5.5 and 2D axisymmetric models. Electric field enhancements at the triple junction points at both terminals are successfully suppressed. This consequently decreases the probability of corona and electric surface discharges, reduces the possibility of dry bands formation, raises the flashover voltage, and improves the long-term operation of the polymeric insulators in service. © 2021 IEEE.

Item Type:	Conference Paper
Publication:	Proceedings of 2021 5th International Conference on Condition Assessment Techniques in Electrical Systems, CATCON 2021
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Electric breakdown; Electric corona; Electric insulation; Flashover; Grading; II-VI semiconductors; Insulating materials; Insulator contamination; Terminals (electric); Zinc oxide, Composite insulators; Electric field distributions; Microvaristors; Non linear; Non-linear field grading composite; Optimisations; Polymeric insulators; Stress control; Switching parameters; ZnO microvaristor, Finite element method
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	09 Mar 2022 10:31
Last Modified:	09 Mar 2022 10:31
URI:	http://eprints.iisc.ac.in/id/eprint/71543

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