ZnO lighting arrester earthing impedance characteristics under transient overvoltages

Lightning arrester in a power system is categorized as a device, which operates in transient conditions. Therefore, the performance of the arrester must be analyzed in transient circumstances. Some particular considerations such as physical (grounding installation) and electrical (impulse current) a...

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Main Author:	Mokhtari, Mehrdad
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/33307/1/MehrdadMokhtariMFKE2013.pdf
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spelling	my-utm-ep.333072017-09-14T04:09:04Z ZnO lighting arrester earthing impedance characteristics under transient overvoltages 2013-01 Mokhtari, Mehrdad TK Electrical engineering. Electronics Nuclear engineering Lightning arrester in a power system is categorized as a device, which operates in transient conditions. Therefore, the performance of the arrester must be analyzed in transient circumstances. Some particular considerations such as physical (grounding installation) and electrical (impulse current) aspects must be taken. Hence, this research aims to take into account the effect of nonlinear characteristics of the grounding impedance on the residual voltage of the lightning protection system in different discharge conditions. In this issue, the lightning protection system consisting of ZnO and grounding model was adjusted to yield the accurate results in EMTP. For this purpose, IEEE dynamic model of ZnO arrester was adjusted such that the manufacturer's performance test results are achieved. The arrester was connected to the improved circuit model of the grounding electrode system. To analyze the performance of the lightning protection system with different grounding configurations, the system was subjected to the three groups of lightning impulse currents. For this purpose, CIGRE standard, Berger, and 8/20 (µs/µs) standard lightning currents were applied as impulse currents. The results shown that the lightning protection system cannot completely protect the power system equipment during the high amplitude and very fast front times of discharge currents, which were experienced under CIGRE and Berger current. In addition, residual voltages of the lightning protection system under standard performance tests for discharge currents less than 5kA do not exceed the protection level, but compare to the manufacturer’s results, the residual voltages are considerably increased. 2013-01 Thesis http://eprints.utm.my/id/eprint/33307/ http://eprints.utm.my/id/eprint/33307/1/MehrdadMokhtariMFKE2013.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:69738?site_name=Restricted Repository masters Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Mokhtari, Mehrdad ZnO lighting arrester earthing impedance characteristics under transient overvoltages
description	Lightning arrester in a power system is categorized as a device, which operates in transient conditions. Therefore, the performance of the arrester must be analyzed in transient circumstances. Some particular considerations such as physical (grounding installation) and electrical (impulse current) aspects must be taken. Hence, this research aims to take into account the effect of nonlinear characteristics of the grounding impedance on the residual voltage of the lightning protection system in different discharge conditions. In this issue, the lightning protection system consisting of ZnO and grounding model was adjusted to yield the accurate results in EMTP. For this purpose, IEEE dynamic model of ZnO arrester was adjusted such that the manufacturer's performance test results are achieved. The arrester was connected to the improved circuit model of the grounding electrode system. To analyze the performance of the lightning protection system with different grounding configurations, the system was subjected to the three groups of lightning impulse currents. For this purpose, CIGRE standard, Berger, and 8/20 (µs/µs) standard lightning currents were applied as impulse currents. The results shown that the lightning protection system cannot completely protect the power system equipment during the high amplitude and very fast front times of discharge currents, which were experienced under CIGRE and Berger current. In addition, residual voltages of the lightning protection system under standard performance tests for discharge currents less than 5kA do not exceed the protection level, but compare to the manufacturer’s results, the residual voltages are considerably increased.
format	Thesis
qualification_level	Master's degree
author	Mokhtari, Mehrdad
author_facet	Mokhtari, Mehrdad
author_sort	Mokhtari, Mehrdad
title	ZnO lighting arrester earthing impedance characteristics under transient overvoltages
title_short	ZnO lighting arrester earthing impedance characteristics under transient overvoltages
title_full	ZnO lighting arrester earthing impedance characteristics under transient overvoltages
title_fullStr	ZnO lighting arrester earthing impedance characteristics under transient overvoltages
title_full_unstemmed	ZnO lighting arrester earthing impedance characteristics under transient overvoltages
title_sort	zno lighting arrester earthing impedance characteristics under transient overvoltages
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2013
url	http://eprints.utm.my/id/eprint/33307/1/MehrdadMokhtariMFKE2013.pdf
_version_	1747816129868333056

ZnO lighting arrester earthing impedance characteristics under transient overvoltages

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