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Optimisation of electric field distribution around polymeric outdoor insulator

Mohd Hanifah, Nor Hazreen (2014) Optimisation of electric field distribution around polymeric outdoor insulator. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Polymer insulators are widely used now a day in high voltage transmission lines to replace porcelain and toughened glass insulators due to their better service performance in polluted environment. Despite this advantage, the major cause of polymeric insulator failure is due to the polymer material aging and degradation which is caused by electrical stress on the high voltage terminal of the insulator. In this project, three techniques for optimising electric field on outdoor polymeric are simulated using COMSOL Multiphysics along the insulator profile. The techniques are by i) improve insulator weather shed shape, ii) corona ring installation optimisation location and iii) adding microvaristor compound as filler. An 11kV polymeric insulator model in clean and dry condition is used in the simulation and the results from the simulation shown all these three techniques can improve the electric field stress on the insulator. In the first technique, a parametric study is done by adjusting the weather shed shape to obtain the best result. From the study, it is shown the weather shed diameter can reduce 70% of the electric stress near the high voltage terminal of the insulator. As for corona ring optimisation installation, the corona ring and tube diameter, and distance from insulator is important in improving the electric field stress. By installing corona ring, the electric field has 37% improvement. In the third techniques, Zinc Oxide with cone shape is used as microvaristor compound filler in the insulator and the improvement is 38%.

Item Type: Thesis (Masters)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics
Depositing User: Normajihan Abd. Rahman
Date Deposited: 30 Jun 2014 02:11
Last Modified: 30 Jun 2014 02:11
URI: http://eprints.uthm.edu.my/id/eprint/5525
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