In-service distribution transformer health index: Insights from field data

Sutan Chairul, Imran and Ab Ghani, Sharin and Kamaruddin, Fatin Nurkamilia and Akryl Azam, Nur Syahida (2025) In-service distribution transformer health index: Insights from field data. Journal of Power and Energy Engineering, 13 (9). pp. 176-185. ISSN 2327-5901

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Abstract

This study introduces the Transformer Health Index (THI), which is derived from the weighted scores of Dissolved Gas Analysis (DGA), Oil Quality Analysis (OQA), and Furan Fraction Analysis (FFA). The assessment methods include the Duval Triangle for DGA, the Chendong model for FFA, and the evaluation of breakdown voltage, acidity, and water content for OQA. The THI was applied to 120 in-service distribution transformers rated at 30 MVA, 33/11kV. Results indicate that transformers classified as “Good” scored high in both DGA and FFA, while those rated “Fair” exhibited lower FFA scores relative to DGA. Conversely, transformers labeled “Poor” showed lower DGA scores compared to FFA, and those in the “Very Poor” category scored low in both DGA and FFA. The impact of service duration on THI indicates that transformer condition generally worsens with age. However, some newer transformers showed signs of rapid deterioration, while certain older units maintained a satisfactory health status.

Item Type:	Article
Uncontrolled Keywords:	Dissolved Gas Analysis, Oil Quality Analysis, Furfural Analysis, Transformer Health Index, Distribution Transformers
Divisions:	Faculty Of Electrical Technology And Engineering
Depositing User:	Norfaradilla Idayu Ab. Ghafar
Date Deposited:	15 Jul 2026 00:52
Last Modified:	15 Jul 2026 00:52
URI:	http://eprints.utem.edu.my/id/eprint/29965
Statistic Details:	View Download Statistic

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