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Computation of Parameters of Power Transformer Windings for Use in Frequency Response Analysis

Nilanga Abeywickrama (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Alexander Podoltsev ; Yuriy Serdyuk (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Stanislaw Gubanski (Institutionen för material- och tillverkningsteknik, Högspänningsteknik)
IEEE Transactions on Magnetics (0018-9464). Vol. 43 (2007), 5, p. 1983-1990.
[Artikel, refereegranskad vetenskaplig]

We present a 3-D model for calculating magnetic fields in a power transformer and the effective parameters (inductance and resistance)of its windings. The transformer is representative of large transformers with power ratings ranging from hundreds of kilovolt amperes to hundreds of megavolt amperes. The model accounts for anisotropic frequency-dependent properties of the laminated transformercore and eddy currents in the steel sheets. We discuss the results of the calculations performed in the frequency range 10 Hz–10 MHz, and show that the largest variations of both the magnetic field and parameters of the windings take place at frequencies below 10 kHz and, at frequencies higher than 1 MHz, the magnetic core does not significantly affect the variation of the effective parameters.

Nyckelord: Cross-sectional eddy current, finite-element method, frequency-dependent parameters, high frequency, laminated magnetic



Denna post skapades 2007-04-26. Senast ändrad 2017-10-03.
CPL Pubid: 40952

 

Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Högspänningsteknik (2005-2017)

Ämnesområden

Elektroteknik
Elkraftteknik

Chalmers infrastruktur