Electrical performance of polymer-type insulators under various service and lightning voltage conditions

Nowadays, the usage of polymer insulators are increasingly popular in the power systems and their outdoor application has resulted in the exposure to the various service conditions such as weather, pollution and lightning conditions. This study expanded previous researches by considering on the e...

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Main Author:	Abd Rahman, Muhammad Syahmi
Format:	Thesis
Language:	English
Published:	2016
Subjects:	Electric power distribution Electric insulators and insulation - Polymers
Online Access:	http://psasir.upm.edu.my/id/eprint/67078/1/FK%202016%20149%20IR.pdf
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id	my-upm-ir.67078
record_format	uketd_dc
spelling	my-upm-ir.670782019-02-19T02:29:48Z Electrical performance of polymer-type insulators under various service and lightning voltage conditions 2016-11 Abd Rahman, Muhammad Syahmi Nowadays, the usage of polymer insulators are increasingly popular in the power systems and their outdoor application has resulted in the exposure to the various service conditions such as weather, pollution and lightning conditions. This study expanded previous researches by considering on the effects of wetting and pollution, i.e. clean-fog and salt-fog on the breakdown strength, voltage, electric field intensity and current density performance of a 10 kV polymer insulator under lightning impulse voltage. A set of experimental (based on IEC 60507) and simulation works revealed that the breakdown strength of insulator has significantly reduced under wet and pollution conditions where 21.18% and 53.33% of reduction was recorded, respectively due to the increase of surface conduction. Besides, the effect of insulator inclination under wetting and different pollution conditions were considered through both lab measurements and finite element modelling. The results indicated that the performance of insulator reduced up to 18.33% and the changes of electric field intensity around the insulator has been one of the factors. It should be mentioned that the inclination of insulator is one of the major problems in the electrical utilities due to line mechanical forces and the deficiency of the equipment itself. The reduction factor of U50 which is obtained from the study can be useful during the planning stage of the distribution line. The effect of lightning induced voltage on the electrical performance of polymer insulator was studied in this thesis, as it is one of the major factors for interruption of distribution lines in Malaysia. Note that the lightning induced voltage is due to the coupling between lightning electromagnetic fields and line condutors. The behaviours of electric field and voltage distribution in different parts of the insulator under lightning induced voltage condition were considered where the effects of pollution thickness, different pollution profile and humidity were investigated. It is expressed that the thickening of surface pollution can significantly increase the electric field intensity and current density for at most 62.17%. This study also found that the electric field increases due to the formation of the dry-band. Meanwhile, the increase in air humidity has been responsible to increase current density stress on the insulator surface. Electric power distribution Electric insulators and insulation - Polymers 2016-11 Thesis http://psasir.upm.edu.my/id/eprint/67078/ http://psasir.upm.edu.my/id/eprint/67078/1/FK%202016%20149%20IR.pdf text en public masters Universiti Putra Malaysia Electric power distribution Electric insulators and insulation - Polymers
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Electric power distribution Electric insulators and insulation - Polymers
spellingShingle	Electric power distribution Electric insulators and insulation - Polymers Abd Rahman, Muhammad Syahmi Electrical performance of polymer-type insulators under various service and lightning voltage conditions
description	Nowadays, the usage of polymer insulators are increasingly popular in the power systems and their outdoor application has resulted in the exposure to the various service conditions such as weather, pollution and lightning conditions. This study expanded previous researches by considering on the effects of wetting and pollution, i.e. clean-fog and salt-fog on the breakdown strength, voltage, electric field intensity and current density performance of a 10 kV polymer insulator under lightning impulse voltage. A set of experimental (based on IEC 60507) and simulation works revealed that the breakdown strength of insulator has significantly reduced under wet and pollution conditions where 21.18% and 53.33% of reduction was recorded, respectively due to the increase of surface conduction. Besides, the effect of insulator inclination under wetting and different pollution conditions were considered through both lab measurements and finite element modelling. The results indicated that the performance of insulator reduced up to 18.33% and the changes of electric field intensity around the insulator has been one of the factors. It should be mentioned that the inclination of insulator is one of the major problems in the electrical utilities due to line mechanical forces and the deficiency of the equipment itself. The reduction factor of U50 which is obtained from the study can be useful during the planning stage of the distribution line. The effect of lightning induced voltage on the electrical performance of polymer insulator was studied in this thesis, as it is one of the major factors for interruption of distribution lines in Malaysia. Note that the lightning induced voltage is due to the coupling between lightning electromagnetic fields and line condutors. The behaviours of electric field and voltage distribution in different parts of the insulator under lightning induced voltage condition were considered where the effects of pollution thickness, different pollution profile and humidity were investigated. It is expressed that the thickening of surface pollution can significantly increase the electric field intensity and current density for at most 62.17%. This study also found that the electric field increases due to the formation of the dry-band. Meanwhile, the increase in air humidity has been responsible to increase current density stress on the insulator surface.
format	Thesis
qualification_level	Master's degree
author	Abd Rahman, Muhammad Syahmi
author_facet	Abd Rahman, Muhammad Syahmi
author_sort	Abd Rahman, Muhammad Syahmi
title	Electrical performance of polymer-type insulators under various service and lightning voltage conditions
title_short	Electrical performance of polymer-type insulators under various service and lightning voltage conditions
title_full	Electrical performance of polymer-type insulators under various service and lightning voltage conditions
title_fullStr	Electrical performance of polymer-type insulators under various service and lightning voltage conditions
title_full_unstemmed	Electrical performance of polymer-type insulators under various service and lightning voltage conditions
title_sort	electrical performance of polymer-type insulators under various service and lightning voltage conditions
granting_institution	Universiti Putra Malaysia
publishDate	2016
url	http://psasir.upm.edu.my/id/eprint/67078/1/FK%202016%20149%20IR.pdf
_version_	1747812440274370560

Electrical performance of polymer-type insulators under various service and lightning voltage conditions

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