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Depolarization Ratio Index (DRI) as alternative method in identifying oil-filled transformer internal faults

Dissolved gas analysis is the most common and well-established method used in identifying internal faults of power transformers. However, an onsite analysis using this method accuracy still need to be improved while the laboratories analysis process takes longer time. New alternative onsite and onli...

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Main Authors: Taib, Mohd Aizam, Muhamad, Nor Asiah, Malek, Zulkurnain Abdul, Rahman, Mohd Nazri Abdul
Format: Article
Published: Springer 2021
Subjects:
L Education (General)
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.um.edu.my/26438/
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spelling my.um.eprints.264382022-03-03T02:03:28Z http://eprints.um.edu.my/26438/ Depolarization Ratio Index (DRI) as alternative method in identifying oil-filled transformer internal faults Taib, Mohd Aizam Muhamad, Nor Asiah Malek, Zulkurnain Abdul Rahman, Mohd Nazri Abdul L Education (General) TA Engineering (General). Civil engineering (General) Dissolved gas analysis is the most common and well-established method used in identifying internal faults of power transformers. However, an onsite analysis using this method accuracy still need to be improved while the laboratories analysis process takes longer time. New alternative onsite and online method are most urgently need to be studied. Power transformer faults identification based on extended application of polarization and depolarization current (PDC) measurement data on oil sample from in-service power transformer was investigated in this research. The changes in the molecular properties of the insulating oil due to different fault conditions found had influenced the initial time response of the PDC measurement (from 0 to 100 s). In this research, the unique characteristic pattern of each condition was determined by a single unique numerical dimensionless quantity known as depolarization ratio index (DRI). DRI is used to express the changes of depolarization current shape with different fault conditions. The ratio of depolarization current between 5/100 and 10/100 s was found to have a better correlation at least more than 90% on the incipient fault in power transformer. Indeed, the DRI at 5/100 also was observed has higher accuracy especially on units with normal, overheating and arcing condition. In addition, a graphical representation of DRI value at 5/100 and 10/100 s was proposed for fault recognition in power transformer. Both DRI and graphical representation are well validated, and the proposed interpretation techniques have accuracy of more than 90% and able to identify and classify the normal, overheating and arcing condition of the in-service power transformer. Springer 2021 Article PeerReviewed Taib, Mohd Aizam and Muhamad, Nor Asiah and Malek, Zulkurnain Abdul and Rahman, Mohd Nazri Abdul (2021) Depolarization Ratio Index (DRI) as alternative method in identifying oil-filled transformer internal faults. Electrical Engineering, 103 (6). pp. 2685-2704. ISSN 0948-7921, DOI https://doi.org/10.1007/s00202-021-01260-2 <https://doi.org/10.1007/s00202-021-01260-2>. 10.1007/s00202-021-01260-2
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic L Education (General)
TA Engineering (General). Civil engineering (General)
spellingShingle L Education (General)
TA Engineering (General). Civil engineering (General)
Taib, Mohd Aizam
Muhamad, Nor Asiah
Malek, Zulkurnain Abdul
Rahman, Mohd Nazri Abdul
Depolarization Ratio Index (DRI) as alternative method in identifying oil-filled transformer internal faults
description Dissolved gas analysis is the most common and well-established method used in identifying internal faults of power transformers. However, an onsite analysis using this method accuracy still need to be improved while the laboratories analysis process takes longer time. New alternative onsite and online method are most urgently need to be studied. Power transformer faults identification based on extended application of polarization and depolarization current (PDC) measurement data on oil sample from in-service power transformer was investigated in this research. The changes in the molecular properties of the insulating oil due to different fault conditions found had influenced the initial time response of the PDC measurement (from 0 to 100 s). In this research, the unique characteristic pattern of each condition was determined by a single unique numerical dimensionless quantity known as depolarization ratio index (DRI). DRI is used to express the changes of depolarization current shape with different fault conditions. The ratio of depolarization current between 5/100 and 10/100 s was found to have a better correlation at least more than 90% on the incipient fault in power transformer. Indeed, the DRI at 5/100 also was observed has higher accuracy especially on units with normal, overheating and arcing condition. In addition, a graphical representation of DRI value at 5/100 and 10/100 s was proposed for fault recognition in power transformer. Both DRI and graphical representation are well validated, and the proposed interpretation techniques have accuracy of more than 90% and able to identify and classify the normal, overheating and arcing condition of the in-service power transformer.
format Article
author Taib, Mohd Aizam
Muhamad, Nor Asiah
Malek, Zulkurnain Abdul
Rahman, Mohd Nazri Abdul
author_facet Taib, Mohd Aizam
Muhamad, Nor Asiah
Malek, Zulkurnain Abdul
Rahman, Mohd Nazri Abdul
author_sort Taib, Mohd Aizam
title Depolarization Ratio Index (DRI) as alternative method in identifying oil-filled transformer internal faults
title_short Depolarization Ratio Index (DRI) as alternative method in identifying oil-filled transformer internal faults
title_full Depolarization Ratio Index (DRI) as alternative method in identifying oil-filled transformer internal faults
title_fullStr Depolarization Ratio Index (DRI) as alternative method in identifying oil-filled transformer internal faults
title_full_unstemmed Depolarization Ratio Index (DRI) as alternative method in identifying oil-filled transformer internal faults
title_sort depolarization ratio index (dri) as alternative method in identifying oil-filled transformer internal faults
publisher Springer
publishDate 2021
url http://eprints.um.edu.my/26438/
_version_ 1735409412896456704
score 13.211869

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