Modified test assembly for water tree study on polymeric insulating materials

Water tree is a process that causes degradation of insulation performance and ageing of Cross-Linked Polyethylene (XLPE) underground cables. It is known as one of the major causes of premature ageing and failure of polymeric cables. Previous research has shown that there are different effects of age...

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Main Author:	Che Mohamad Shukri, Che Nuru Saniyyati
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/48843/25/CheNuruSaniyyatiMFKE2014.pdf
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spelling	my-utm-ep.488432020-06-30T03:34:16Z Modified test assembly for water tree study on polymeric insulating materials 2014-06 Che Mohamad Shukri, Che Nuru Saniyyati TK Electrical engineering. Electronics Nuclear engineering Water tree is a process that causes degradation of insulation performance and ageing of Cross-Linked Polyethylene (XLPE) underground cables. It is known as one of the major causes of premature ageing and failure of polymeric cables. Previous research has shown that there are different effects of ageing time on water tree growth in different types of polymeric insulating materials where nickel and platinum have been used as electrodes and were found to cause corrosion and reduce efficiency. Thus, in this research, a modified test assembly using tungsten needle as an electrode to avoid corrosion and increase efficiency was introduced. This research investigated the effects of ageing time on water tree growth in two different types of polymeric sample namely (XLPE) and Low-Density Polyethylene (LDPE) under high voltage stress. Using computational simulation, the effect of voltage application and angle of tip radius against electric field using COMSOL 4.2a was studied. In this study, the polymeric samples were prepared using a new method known as “leaf-like” specimen method. The experiment was based on BS IEC 61956 2001, “Methods of test for the evaluation of water treeing in insulating materials” and BS EN 60243-1 : 1998, “Electrical strength of insulating materials-Test methods”. Samples were exposed to high voltage injection for 150 hours and 470 hours. The simulation results show that when voltage application increases, the electric field will increase. Besides that, a lower angle of tip radius in polymeric sample, will result in higher electric field being produced. Experimental results show that water tree growth is proportional to ageing time of the two polymeric samples. However, XLPE has better water treeing resistance than LDPE because the average length of water tree growth for LDPE is higher as compared to XLPE. This study has shown that ageing time as the cause of water tree growth that causes degradation in insulation performance has different effects on different types of polymers. 2014-06 Thesis http://eprints.utm.my/id/eprint/48843/ http://eprints.utm.my/id/eprint/48843/25/CheNuruSaniyyatiMFKE2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:85357 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 Che Mohamad Shukri, Che Nuru Saniyyati Modified test assembly for water tree study on polymeric insulating materials
description	Water tree is a process that causes degradation of insulation performance and ageing of Cross-Linked Polyethylene (XLPE) underground cables. It is known as one of the major causes of premature ageing and failure of polymeric cables. Previous research has shown that there are different effects of ageing time on water tree growth in different types of polymeric insulating materials where nickel and platinum have been used as electrodes and were found to cause corrosion and reduce efficiency. Thus, in this research, a modified test assembly using tungsten needle as an electrode to avoid corrosion and increase efficiency was introduced. This research investigated the effects of ageing time on water tree growth in two different types of polymeric sample namely (XLPE) and Low-Density Polyethylene (LDPE) under high voltage stress. Using computational simulation, the effect of voltage application and angle of tip radius against electric field using COMSOL 4.2a was studied. In this study, the polymeric samples were prepared using a new method known as “leaf-like” specimen method. The experiment was based on BS IEC 61956 2001, “Methods of test for the evaluation of water treeing in insulating materials” and BS EN 60243-1 : 1998, “Electrical strength of insulating materials-Test methods”. Samples were exposed to high voltage injection for 150 hours and 470 hours. The simulation results show that when voltage application increases, the electric field will increase. Besides that, a lower angle of tip radius in polymeric sample, will result in higher electric field being produced. Experimental results show that water tree growth is proportional to ageing time of the two polymeric samples. However, XLPE has better water treeing resistance than LDPE because the average length of water tree growth for LDPE is higher as compared to XLPE. This study has shown that ageing time as the cause of water tree growth that causes degradation in insulation performance has different effects on different types of polymers.
format	Thesis
qualification_level	Master's degree
author	Che Mohamad Shukri, Che Nuru Saniyyati
author_facet	Che Mohamad Shukri, Che Nuru Saniyyati
author_sort	Che Mohamad Shukri, Che Nuru Saniyyati
title	Modified test assembly for water tree study on polymeric insulating materials
title_short	Modified test assembly for water tree study on polymeric insulating materials
title_full	Modified test assembly for water tree study on polymeric insulating materials
title_fullStr	Modified test assembly for water tree study on polymeric insulating materials
title_full_unstemmed	Modified test assembly for water tree study on polymeric insulating materials
title_sort	modified test assembly for water tree study on polymeric insulating materials
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2014
url	http://eprints.utm.my/id/eprint/48843/25/CheNuruSaniyyatiMFKE2014.pdf
_version_	1747817485245087744

Modified test assembly for water tree study on polymeric insulating materials

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