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

Serbian Journal of Electrical Engineering. 2014;11(2):243-256 DOI 10.2298/SJEE131123020M

 

Journal Homepage

Journal Title: Serbian Journal of Electrical Engineering

ISSN: 1451-4869 (Print); 2217-7183 (Online)

Publisher: Faculty of Technical Sciences in Cacak

LCC Subject Category: Technology: Electrical engineering. Electronics. Nuclear engineering

Country of publisher: Serbia

Language of fulltext: English

Full-text formats available: PDF

 

AUTHORS

Mikulović Jovan Č. (Faculty of Electrical Engineering, Belgrade)
Šekara Tomislav B. (Faculty of Electrical Engineering, Belgrade)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 25 weeks

 

Abstract | Full Text

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. [Projekat Ministartsva nauke Republike Srbije, br. TR-33037 i br. TR-33020]