The numerical method of inverse Laplace transform for calculation of overvoltages in power transformers and test results

A methodology for calculation of overvoltages in transformer windings, based on a numerical method of inverse Laplace transform, is presented. Mathematical model of transformer windings is described by partial differential equations corresponding to distributed parameters electrical circuits. The pr...

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Bibliographic Details
Published in:Serbian journal of electrical engineering 2014, Vol.11 (2), p.243-256
Main Authors: Mikulovic, Jovan, Sekara, Tomislav
Format: Article
Language:English
Subjects:
inverse Laplace transform
numerical methods
overvoltages
transformer winding
transients
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Summary:A methodology for calculation of overvoltages in transformer windings, based on a numerical method of inverse Laplace transform, is presented. Mathematical model of transformer windings is described by partial differential equations corresponding to distributed parameters electrical circuits. The procedure of calculating overvoltages is applied to windings having either isolated neutral point, or grounded neutral point, or neutral point grounded through impedance. A comparative analysis of the calculation results obtained by the proposed numerical method and by analytical method of calculation of overvoltages in transformer windings is presented. The results computed by the proposed method and measured voltage distributions, when a voltage surge is applied to a three-phase 30 kVA power transformer, are compared.
ISSN:1451-4869
2217-7183
DOI:10.2298/SJEE131123020M