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

Jovan Mikulović | Zendy; Tomislav B. Šekara | Zendy

Open Access

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

Author(s) -

Jovan Mikulović,

Tomislav B. Šekara

Publication year - 2014

Publication title -

serbian journal of electrical engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.133

H-Index - 5

eISSN - 2217-7183

pISSN - 1451-4869

DOI - 10.2298/sjee131123020m

Subject(s) - laplace transform , transformer , electromagnetic coil , inverse laplace transform , electrical impedance , distribution transformer , electrical engineering , voltage , engineering , mathematics , electronic engineering , control theory (sociology) , mathematical analysis , computer science , control (management) , artificial intelligence

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

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