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International Journal of Emerging Electric Power Systems

Editor-in-Chief: Sidhu, Tarlochan

Ed. by Khaparde, S A / Rosolowski, Eugeniusz / Saha, Tapan K / Gao, Fei

CiteScore 2018: 0.86

SCImago Journal Rank (SJR) 2018: 0.220
Source Normalized Impact per Paper (SNIP) 2018: 0.430

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Volume 14, Issue 6


Estimation of Transformer Winding Capacitances through Frequency Response Analysis – An Experimental Investigation

Krupa Shah
  • Corresponding author
  • Department of Electrical Engineering, Indian Institute of Technology Gandhinagar, VGEC College Campus Visat-Gandhinagar Highway, Ahmedabad, Gujarat 382424, India
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/ K. Ragavan
  • Department of Electrical Engineering, Indian Institute of Technology Gandhinagar, VGEC College Campus Visat-Gandhinagar Highway, Ahmedabad, Gujarat 382424, India
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Published Online: 2013-10-19 | DOI: https://doi.org/10.1515/ijeeps-2013-0098


This article focuses on developing a non-invasive method for determining capacitances using frequency response data. The proposed methodology involves acquiring driving-point impedance of the winding under consideration over wide frequency range. With certain terminal conditions and using the terminal impedance measured at specific frequencies, input and shunt capacitances are determined. For the purpose of estimating series capacitance of the winding, an algorithm is proposed. To demonstrate the capability of the method, initially model coils that have provisions for connecting external capacitances are considered. Then, it is found that the estimated values of capacitances are nearly same as those of connected capacitances. The method is, then, extended to transformer winding, and a capacitive ladder network is constructed. To assess the accuracy of estimation, capacitive voltage distribution is utilized. That is, the voltage distribution in the winding is compared with that of synthesized circuit. A good agreement between those data reveals that the estimated capacitance values are accurate.

Keywords: driving-point impedance; frequency response analysis; power transformer; series capacitance; terminal measurement


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About the article

Published Online: 2013-10-19

Citation Information: International Journal of Emerging Electric Power Systems, Volume 14, Issue 6, Pages 549–559, ISSN (Online) 1553-779X, ISSN (Print) 2194-5756, DOI: https://doi.org/10.1515/ijeeps-2013-0098.

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