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Estimation of Series Capacitance for a Three-Phase Transformer Winding From Its Measured Frequency Response

Pramanik, Saurav and Satish, L (2013) Estimation of Series Capacitance for a Three-Phase Transformer Winding From Its Measured Frequency Response. In: IEEE TRANSACTIONS ON POWER DELIVERY, 28 (4). pp. 2437-2444.

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Official URL: http://dx.doi.org/10.1109/TPWRD.2013.2260772


Recently, authors published a method to indirectly measure series capacitance (C-s) of a single, isolated, uniformly wound transformer winding, from its measured frequency response. The next step was to implement it on an actual three-phase transformer. This task is not as straightforward as it might appear at first glance, since the measured frequency response on a three-phase transformer is influenced by nontested windings and their terminal connections, core, tank, etc. To extract the correct value of C-s from this composite frequency response, the formulation has to be reworked to first identify all significant influences and then include their effects. Initially, the modified method and experimental results on a three-phase transformer (4 MVA, 33 kV/433 V) are presented along with results on the winding considered in isolation (for cross validation). Later, the method is directly implemented on another three-phase unit (3.5 MVA, 13.8 kV/765 V) to show repeatability.

Item Type: Journal Article
Additional Information: copyright for this article belongs to IEEE Xplore
Keywords: Frequency response; frequency-response analysis (FRA); high-voltage (HV) winding; series capacitance; three-phase transformers
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 13 Nov 2013 10:53
Last Modified: 13 Nov 2013 10:53
URI: http://eprints.iisc.ac.in/id/eprint/47748

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