Investigating the application of frequency response analysis for diagnosing tap changer on power transformer
Electrical distribution power transformers operate on transmission and distribution systems which require different voltage levels. A sufficiently constant level of grid potential is maintained by mechanically regulating the turn ratio in the transformer winding, which can be achieved through OLTC o...
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my-uthm-ep.4332021-07-25T06:21:43Z Investigating the application of frequency response analysis for diagnosing tap changer on power transformer 2018-01 Ahmed Al-subari, Musaed Mohammed TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers Electrical distribution power transformers operate on transmission and distribution systems which require different voltage levels. A sufficiently constant level of grid potential is maintained by mechanically regulating the turn ratio in the transformer winding, which can be achieved through OLTC or DETC. Since the tap changer is the only moving component of the transformer, it is particularly vulnerable to degradation mechanism. Many diagnosis tools have been developed to evaluate the mechanical integrity of tap contacts since many years ago. However, studies related tap changer diagnosis using FRA is still lacking. This thesis adapts, frequency response analysis which is proven to be a powerful and globally popular diagnostic tool in detecting power transformer mechanical integrity. Since this method is comparative, thus interpretation of FRA signal is still challenge and required skilled personnel to identify the cause of Fault. Two common tap changer deformation mechanisms and four types of transformer based connection test types are established. A lumped transformer model has been developed to identify the underline causes of FRA response curve changes between faulty and normal conditions for better interpretation. This model mainly focusses on low and mid frequency regions due to fact, that major changes occurs at the above-mentioned regions. In addition to that, this new technique of OLTC diagnosis will be recommended for future detection of tap changers faults and diagnosis of winding degradations simultaneously since they are interconnected by using the same instrument. 2018-01 Thesis http://eprints.uthm.edu.my/433/ http://eprints.uthm.edu.my/433/1/24p%20MUSAED%20MOHAMMED%20AHMED%20AL-SUBARI.pdf text en public http://eprints.uthm.edu.my/433/2/MUSAED%20MOHAMMED%20AHMED%20AL-SUBARI%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/433/3/MUSAED%20MOHAMMED%20AHMED%20AL-SUBARI%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Faculty of Electrical and Electronic Engineering |
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Universiti Tun Hussein Onn Malaysia |
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UTHM Institutional Repository |
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English English English |
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TK2000-2891 Dynamoelectric machinery and auxiliaries Including generators, motors, transformers |
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TK2000-2891 Dynamoelectric machinery and auxiliaries Including generators, motors, transformers Ahmed Al-subari, Musaed Mohammed Investigating the application of frequency response analysis for diagnosing tap changer on power transformer |
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Electrical distribution power transformers operate on transmission and distribution systems which require different voltage levels. A sufficiently constant level of grid potential is maintained by mechanically regulating the turn ratio in the transformer winding, which can be achieved through OLTC or DETC. Since the tap changer is the only moving component of the transformer, it is particularly vulnerable to degradation mechanism. Many diagnosis tools have been developed to evaluate the mechanical integrity of tap contacts since many years ago. However, studies related tap changer diagnosis using FRA is still lacking. This thesis adapts, frequency response analysis which is proven to be a powerful and globally popular diagnostic tool in detecting power transformer mechanical integrity. Since this method is comparative, thus interpretation of FRA signal is still challenge and required skilled personnel to identify the cause of Fault. Two common tap changer deformation mechanisms and four types of transformer based connection test types are established. A lumped transformer model has been developed to identify the underline causes of FRA response curve changes between faulty and normal conditions for better interpretation. This model mainly focusses on low and mid frequency regions due to fact, that major changes occurs at the above-mentioned regions. In addition to that, this new technique of OLTC diagnosis will be recommended for future detection of tap changers faults and diagnosis of winding degradations simultaneously since they are interconnected by using the same instrument. |
format |
Thesis |
qualification_name |
Master of Philosophy (M.Phil.) |
qualification_level |
Master's degree |
author |
Ahmed Al-subari, Musaed Mohammed |
author_facet |
Ahmed Al-subari, Musaed Mohammed |
author_sort |
Ahmed Al-subari, Musaed Mohammed |
title |
Investigating the application of frequency response analysis for diagnosing tap changer on power transformer |
title_short |
Investigating the application of frequency response analysis for diagnosing tap changer on power transformer |
title_full |
Investigating the application of frequency response analysis for diagnosing tap changer on power transformer |
title_fullStr |
Investigating the application of frequency response analysis for diagnosing tap changer on power transformer |
title_full_unstemmed |
Investigating the application of frequency response analysis for diagnosing tap changer on power transformer |
title_sort |
investigating the application of frequency response analysis for diagnosing tap changer on power transformer |
granting_institution |
Universiti Tun Hussein Onn Malaysia |
granting_department |
Faculty of Electrical and Electronic Engineering |
publishDate |
2018 |
url |
http://eprints.uthm.edu.my/433/1/24p%20MUSAED%20MOHAMMED%20AHMED%20AL-SUBARI.pdf http://eprints.uthm.edu.my/433/2/MUSAED%20MOHAMMED%20AHMED%20AL-SUBARI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/433/3/MUSAED%20MOHAMMED%20AHMED%20AL-SUBARI%20WATERMARK.pdf |
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1747830608906682368 |