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Improvement of distribution transformer fault analysis using FRA method

The distribution transformers are one of the most expensive components in the electrical power distribution system. During its lifetime, distribution transformers are exposed to several failures. For this reason, it is crucial to continuously monitor its condition. Frequency Response Analysis (...

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Main Author: Nasser Al-Ameri, Salem Mgammal Awadh
Format: Thesis
Language:English
English
English
Published: 2019
Subjects:
TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers
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spelling my.uthm.eprints.9422021-09-09T06:16:16Z http://eprints.uthm.edu.my/942/ Improvement of distribution transformer fault analysis using FRA method Nasser Al-Ameri, Salem Mgammal Awadh TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers The distribution transformers are one of the most expensive components in the electrical power distribution system. During its lifetime, distribution transformers are exposed to several failures. For this reason, it is crucial to continuously monitor its condition. Frequency Response Analysis (FRA) is an advanced electrical test, which is commonly employed to investigate the transformer’s main winding. Moreover, it has been shown to be sensitive to non-mechanical changes such as winding insulation. The measured FRA result needs to be compared with the previous measurement to identify any variation between them. The variation will indicate mechanical changes in the transformer. However, interpreting the variation to determine the type, location, and severity of the suspected failure, requires expertise. For this reason, further understanding of the damage detecting characteristic of FRA is required. In this study, an electrical circuit model is developed based on 33/11kV, 1MVA distribution transformer to investigate the influence of various changes in the winding RLC values on the frequency response. The model is also used to simulate other failures such as winding deformation, bushing and short circuit faults. In addition, the tap changer fault and weakness of clamping structure are also investigated by examining an 11/0.433 kV, 500KVA distribution transformer. Additionally, the transformer ageing and degradation of winding’s insulation is also investigated using different FRA measurement configuration. Findings show that tap changer coking and clamping faults affect the frequency response at less than 2kHz. FRA capacitive inter-winding shows isolation in between 2kHz to 20kHz due to transformer ageing. The frequency response shifting towards lower frequencies at 20kHz to 2MHz due to winding insulation degradation. Also, in this study, the method or interpretation scheme for FRA is obtained. It is a guideline in the form of a flowchart, which is proposed for the first time and helps the engineers in having a better interpretation of FRA results. In conclusion, this study is to improve the understanding on the distribution transformers faults detection using FRA method. 2019-12 Thesis NonPeerReviewed text en http://eprints.uthm.edu.my/942/1/24p%20SALEM%20MGAMMAL%20AWADH%20NASSER%20AL-AMERI.pdf text en http://eprints.uthm.edu.my/942/2/SALEM%20MGAMMAL%20AWADH%20NASSER%20AL-AMERI%20COPYRIGHT%20DECLARATION.pdf text en http://eprints.uthm.edu.my/942/3/SALEM%20MGAMMAL%20AWADH%20NASSER%20AL-AMERI%20WATERMARK.pdf Nasser Al-Ameri, Salem Mgammal Awadh (2019) Improvement of distribution transformer fault analysis using FRA method. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.
institution Universiti Tun Hussein Onn Malaysia
building UTHM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tun Hussein Onn Malaysia
content_source UTHM Institutional Repository
url_provider http://eprints.uthm.edu.my/
language English
English
English
topic TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers
spellingShingle TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers
Nasser Al-Ameri, Salem Mgammal Awadh
Improvement of distribution transformer fault analysis using FRA method
description The distribution transformers are one of the most expensive components in the electrical power distribution system. During its lifetime, distribution transformers are exposed to several failures. For this reason, it is crucial to continuously monitor its condition. Frequency Response Analysis (FRA) is an advanced electrical test, which is commonly employed to investigate the transformer’s main winding. Moreover, it has been shown to be sensitive to non-mechanical changes such as winding insulation. The measured FRA result needs to be compared with the previous measurement to identify any variation between them. The variation will indicate mechanical changes in the transformer. However, interpreting the variation to determine the type, location, and severity of the suspected failure, requires expertise. For this reason, further understanding of the damage detecting characteristic of FRA is required. In this study, an electrical circuit model is developed based on 33/11kV, 1MVA distribution transformer to investigate the influence of various changes in the winding RLC values on the frequency response. The model is also used to simulate other failures such as winding deformation, bushing and short circuit faults. In addition, the tap changer fault and weakness of clamping structure are also investigated by examining an 11/0.433 kV, 500KVA distribution transformer. Additionally, the transformer ageing and degradation of winding’s insulation is also investigated using different FRA measurement configuration. Findings show that tap changer coking and clamping faults affect the frequency response at less than 2kHz. FRA capacitive inter-winding shows isolation in between 2kHz to 20kHz due to transformer ageing. The frequency response shifting towards lower frequencies at 20kHz to 2MHz due to winding insulation degradation. Also, in this study, the method or interpretation scheme for FRA is obtained. It is a guideline in the form of a flowchart, which is proposed for the first time and helps the engineers in having a better interpretation of FRA results. In conclusion, this study is to improve the understanding on the distribution transformers faults detection using FRA method.
format Thesis
author Nasser Al-Ameri, Salem Mgammal Awadh
author_facet Nasser Al-Ameri, Salem Mgammal Awadh
author_sort Nasser Al-Ameri, Salem Mgammal Awadh
title Improvement of distribution transformer fault analysis using FRA method
title_short Improvement of distribution transformer fault analysis using FRA method
title_full Improvement of distribution transformer fault analysis using FRA method
title_fullStr Improvement of distribution transformer fault analysis using FRA method
title_full_unstemmed Improvement of distribution transformer fault analysis using FRA method
title_sort improvement of distribution transformer fault analysis using fra method
publishDate 2019
url http://eprints.uthm.edu.my/942/1/24p%20SALEM%20MGAMMAL%20AWADH%20NASSER%20AL-AMERI.pdf
http://eprints.uthm.edu.my/942/2/SALEM%20MGAMMAL%20AWADH%20NASSER%20AL-AMERI%20COPYRIGHT%20DECLARATION.pdf
http://eprints.uthm.edu.my/942/3/SALEM%20MGAMMAL%20AWADH%20NASSER%20AL-AMERI%20WATERMARK.pdf
http://eprints.uthm.edu.my/942/
_version_ 1738580802173665280
score 13.211869

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