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Experimental Results on Estimation of Effective Inductance Associated with Winding Resonances of 1- and 3- Transformers Using Measured FRA

Biswas, B and Satish, L (2020) Experimental Results on Estimation of Effective Inductance Associated with Winding Resonances of 1- and 3- Transformers Using Measured FRA. In: IEEE Transactions on Power Delivery, 35 (5). pp. 2378-2386.

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Official URL: https://dx.doi.org/10.1109/TPWRD.2020.2967092

Abstract

An indirect measurement method based on an analytical formula is presented to estimate the effective inductance which is associated with the winding resonances of an iron core transformer winding. It is applicable to any 1-Φ or 3-Φ (Y, Δ) winding, with any condition of the neutral. A new analytical method is developed using authors' recent work (which linked the harmonic sum of squares of natural frequencies of a winding to its inductances and capacitances). Data about the trough (SCNFs) or peak (OCNFs) frequencies corresponding to two FRAs is the only required input; one FRA corresponding to the nominal condition and another measured after connecting a known lumped capacitor across the winding. Details of derivations for each 1-Φ and 3-Φ configuration is initially presented. Thereafter, experimental results are discussed on 1-Φ and 3-Φ, 33 kV, 3.5 MVA winding setup, where any desired winding connection can be configured and examined. Then, results on two actual transformers are discussed to prove method's practical implementability. Finally, some preliminary thoughts on using this newly defined quantity for assessing mechanical integrity of winding is briefly examined. © 1986-2012 IEEE.

Item Type: Journal Article
Publication: IEEE Transactions on Power Delivery
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: copyright to this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords: Inductance; Transformer windings, Analytical formulas; Analytical method; Implementability; Indirect measurement method; Lumped capacitors; Mechanical integrity; Sum of squares; Winding connection, Winding
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 23 Nov 2020 09:28
Last Modified: 23 Nov 2020 09:28
URI: http://eprints.iisc.ac.in/id/eprint/66901

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