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Study on non-linear grading material as stress control on polymeric outdoor insulator

Ahmad Shuhaimy, Nur Hanani (2014) Study on non-linear grading material as stress control on polymeric outdoor insulator. Masters thesis, Universiti Tun Hussein Onn Malaysia.


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Over the last few decades, polymeric insulators started to gain popularity amongst electric power utilities around the world. They are subject to mainly electrical stress more than mechanical or environmental stress. This paper investigates the potential use of non-linear grading material for optimising field distribution and the effectiveness in controlling the electric field stress on outdoor polymeric insulator. A two-dimensional (2D) asymmetrical modelling based on 11 kV polymeric insulator system voltage was modelled using a commercially available Finite Element Method (FEM) package. The electric field and potentials distributions along the leakage path on the surface of the insulator were computed using the FEM. Analysis of electric potential and field distributions on the insulator surface is under dry clean and contaminated surface conditions for non-graded polymeric insulator and microvaristor-graded polymeric insulator. Non-linear grading material was introduced at both insulator ends for controlling high field. The lightning impulse flashover test (1.2/50 μs), has been conducted for both graded and non- graded insulators to evaluate the effect of stress grading coating on the breakdown performance The percentage of field reduction are almost 23% under dry-clean surface and 17% for wet-polluted surface at high voltage terminal. The approach of microvaristor grading material with an appropriate switching characteristic has improved electric field and heat distributions along the insulator profile.

Item Type: Thesis (Masters)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3001-3521 Distribution or transmission of electric power
Depositing User: Normajihan Abd. Rahman
Date Deposited: 25 Jun 2014 08:47
Last Modified: 25 Jun 2014 08:47
URI: http://eprints.uthm.edu.my/id/eprint/5530
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