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Modelling Of Leakage Current On Conductive Surface For Outdoor Insulators

The insulation system is the most important part in the high voltage applications to prevent the flow of leakage current to undesired path. Solid outdoor insulators are one of the basic elements in a power system such as in the transmission and distribution system. The outdoor insulator commonly exp...

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Main Author: Abd Rahim, Noor Afiqah
Format: Thesis
Language:English
English
Published: 2021
Subjects:
T Technology (General)
TK Electrical engineering. Electronics Nuclear engineering
Online Access:http://eprints.utem.edu.my/id/eprint/25396/1/Modelling%20Of%20Leakage%20Current%20On%20Conductive%20Surface%20For%20Outdoor%20Insulators.pdf
http://eprints.utem.edu.my/id/eprint/25396/2/Modelling%20Of%20Leakage%20Current%20On%20Conductive%20Surface%20For%20Outdoor%20Insulators.pdf
http://eprints.utem.edu.my/id/eprint/25396/
https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=119687
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spelling my.utem.eprints.253962021-11-17T09:09:34Z http://eprints.utem.edu.my/id/eprint/25396/ Modelling Of Leakage Current On Conductive Surface For Outdoor Insulators Abd Rahim, Noor Afiqah T Technology (General) TK Electrical engineering. Electronics Nuclear engineering The insulation system is the most important part in the high voltage applications to prevent the flow of leakage current to undesired path. Solid outdoor insulators are one of the basic elements in a power system such as in the transmission and distribution system. The outdoor insulator commonly exposed to environmental pollution. The presence of water like raindrops and dew on the contaminant surface can lead to the insulator surface degradation. The contaminant particles may be dissolved into water. Thus, this condition can caused the formation of the conductive path that can lead to the flow of the current due to the surface discharge event. However, the physical process of this phenomenon is not well understood. In order to understand the propagation of the surface discharge on the insulator, the mechanism for the charge carrier generation and transportation must be known. Hence, in this study, the mathematical model of leakage current on the outdoor insulator surface using the Nernst Planck theory that accounts for the charge transport between the electrodes (negative and positive electrode) and charge generation mechanism is developed. Meanwhile, the electric field obeys Poisson’s equation. In this model, one-dimensional (1-D) model is studied. The charge continuity equations and Poisson’s equation solved using a non-dimensional framework to reduce the difficulty while doing the simulation. Then, this model is solved numerically using the method of lines (MOL) technique which converts the partial differential equations (PDEs) into a set of ordinary differential equations (ODEs). The ODEs then solved using an appropriate time integration method ‘ode15s’ in MATLAB. In order to validate the simulation result, experimental work is done according to inclined plane test (IPT) complying with BS EN 60587-2007. Then, the result from both simulation and experimental work is compared for the validation of this model. The findings from the simulation shows that the density of net space charge distribution gives the good correlation to the electric field. Besides, the conduction current also varies depending on the electric field distribution and charge concentration. In addition, The simulation result appears to have good correlation with the experimental result in terms of leakage current rising. Hence, from the simulation, it can, be seen that this mathematical model can be used in order to investigate the leakage current on the outdoor insulator due to the presence of surface discharge. In addition, the permittivity gives the effect to the number of charge produced on the outdoor insulator due to the present of wet contaminant. Thus, the charge will produce more flux in a medium with a lower permittivity than a medium with high permittivity. 2021 Thesis NonPeerReviewed text en http://eprints.utem.edu.my/id/eprint/25396/1/Modelling%20Of%20Leakage%20Current%20On%20Conductive%20Surface%20For%20Outdoor%20Insulators.pdf text en http://eprints.utem.edu.my/id/eprint/25396/2/Modelling%20Of%20Leakage%20Current%20On%20Conductive%20Surface%20For%20Outdoor%20Insulators.pdf Abd Rahim, Noor Afiqah (2021) Modelling Of Leakage Current On Conductive Surface For Outdoor Insulators. Masters thesis, Universiti Teknikal Malaysia Melaka. https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=119687
institution Universiti Teknikal Malaysia Melaka
building UTEM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknikal Malaysia Melaka
content_source UTEM Institutional Repository
url_provider http://eprints.utem.edu.my/
language English
English
topic T Technology (General)
TK Electrical engineering. Electronics Nuclear engineering
spellingShingle T Technology (General)
TK Electrical engineering. Electronics Nuclear engineering
Abd Rahim, Noor Afiqah
Modelling Of Leakage Current On Conductive Surface For Outdoor Insulators
description The insulation system is the most important part in the high voltage applications to prevent the flow of leakage current to undesired path. Solid outdoor insulators are one of the basic elements in a power system such as in the transmission and distribution system. The outdoor insulator commonly exposed to environmental pollution. The presence of water like raindrops and dew on the contaminant surface can lead to the insulator surface degradation. The contaminant particles may be dissolved into water. Thus, this condition can caused the formation of the conductive path that can lead to the flow of the current due to the surface discharge event. However, the physical process of this phenomenon is not well understood. In order to understand the propagation of the surface discharge on the insulator, the mechanism for the charge carrier generation and transportation must be known. Hence, in this study, the mathematical model of leakage current on the outdoor insulator surface using the Nernst Planck theory that accounts for the charge transport between the electrodes (negative and positive electrode) and charge generation mechanism is developed. Meanwhile, the electric field obeys Poisson’s equation. In this model, one-dimensional (1-D) model is studied. The charge continuity equations and Poisson’s equation solved using a non-dimensional framework to reduce the difficulty while doing the simulation. Then, this model is solved numerically using the method of lines (MOL) technique which converts the partial differential equations (PDEs) into a set of ordinary differential equations (ODEs). The ODEs then solved using an appropriate time integration method ‘ode15s’ in MATLAB. In order to validate the simulation result, experimental work is done according to inclined plane test (IPT) complying with BS EN 60587-2007. Then, the result from both simulation and experimental work is compared for the validation of this model. The findings from the simulation shows that the density of net space charge distribution gives the good correlation to the electric field. Besides, the conduction current also varies depending on the electric field distribution and charge concentration. In addition, The simulation result appears to have good correlation with the experimental result in terms of leakage current rising. Hence, from the simulation, it can, be seen that this mathematical model can be used in order to investigate the leakage current on the outdoor insulator due to the presence of surface discharge. In addition, the permittivity gives the effect to the number of charge produced on the outdoor insulator due to the present of wet contaminant. Thus, the charge will produce more flux in a medium with a lower permittivity than a medium with high permittivity.
format Thesis
author Abd Rahim, Noor Afiqah
author_facet Abd Rahim, Noor Afiqah
author_sort Abd Rahim, Noor Afiqah
title Modelling Of Leakage Current On Conductive Surface For Outdoor Insulators
title_short Modelling Of Leakage Current On Conductive Surface For Outdoor Insulators
title_full Modelling Of Leakage Current On Conductive Surface For Outdoor Insulators
title_fullStr Modelling Of Leakage Current On Conductive Surface For Outdoor Insulators
title_full_unstemmed Modelling Of Leakage Current On Conductive Surface For Outdoor Insulators
title_sort modelling of leakage current on conductive surface for outdoor insulators
publishDate 2021
url http://eprints.utem.edu.my/id/eprint/25396/1/Modelling%20Of%20Leakage%20Current%20On%20Conductive%20Surface%20For%20Outdoor%20Insulators.pdf
http://eprints.utem.edu.my/id/eprint/25396/2/Modelling%20Of%20Leakage%20Current%20On%20Conductive%20Surface%20For%20Outdoor%20Insulators.pdf
http://eprints.utem.edu.my/id/eprint/25396/
https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=119687
_version_ 1717097550834565120
score 13.211869

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