Equivalent circuit approximation of transformer insulation by using PDC measurement

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dc.contributor.authorRoongroj, Ch
dc.contributor.authorPattanadech, N.
dc.contributor.authorPraisuwanna, P.
dc.contributor.authorYutthagowith, P.
dc.contributor.authorThongkaemkaew, K.
dc.date.accessioned2026-08-06T09:57:04Z
dc.date.available2026-08-06T09:57:04Z
dc.date.issued2008-10-06
dc.description.abstractThis paper represents the insulation model of 3φ, 50 MVA, 132.8/13.8 kV power transformer. This model is developed from the polarization and depolarization current measurement (PDC). The insulation modeling consists of a parallel circuit among C<inf>50</inf> <inf>Hz</inf>, R<inf>0</inf>, R <inf>1</inf> and C<inf>1</inf> in series, R<inf>2</inf> and C<inf>2</inf> in series, R<inf>3</inf> and C<inf>3</inf> in series, and R<inf>4</inf> and C <inf>4</inf> in series. C<inf>50</inf> <inf>Hz</inf> is obtained from the conventional measurement method; whereas, the applied step voltage and the sum of PDC are calculated for R<inf>0</inf>. The individual elements (R<inf>1</inf> and C<inf>1</inf>) are determined from fitting technique employing MATLAB program. From experimental results of the tested transformer, the example of insulation model for Transformer No. 1 (T1) is created with C<inf>50</inf> <inf>Hz</inf> of 3.643 nF, R<inf>0</inf> of 334.8 GΩ. The values of R <inf>1</inf>-R<inf>4</inf> are 86.52, 110.5, 669.5 and 271.0 GΩ respectively; while, the values of C<inf>1</inf>-C<inf>4</inf> are 37.62, 6.047, 0.101 and 0.013 nF respectively. The proposed model is validated by calculating dissipation factor and measuring dissipation factor. The results show that the proposed model and experimental validation are good agreement with each others. © 2008 IEEE.
dc.identifier.citation5th International Conference on Electrical Engineering Electronics Computer Telecommunications and Information Technology Ecti Con 2008, 2, 925-928, 2008
dc.identifier.doi10.1109/ECTICON.2008.4600582
dc.identifier.other2-s2.0-52949106119
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/2133
dc.source5th International Conference on Electrical Engineering Electronics Computer Telecommunications and Information Technology Ecti Con 2008
dc.subjectComplex capacitance
dc.subjectDissipation factor
dc.subjectInsulation modeling
dc.subjectPolarization and depolarization current
dc.subjectTransformer insulation
dc.titleEquivalent circuit approximation of transformer insulation by using PDC measurement
dc.typeConference Paper

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