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High-frequency modeling of power transformers for use in frequency response analysis (FRA)

Nilanga Abeywickrama (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Yuriy Serdyuk (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Stanislaw Gubanski (Institutionen för material- och tillverkningsteknik, Högspänningsteknik)
IEEE Transactions on Power Delivery (0885-8977). Vol. 23 (2008), 4, p. 2042-2049.
[Artikel, refereegranskad vetenskaplig]

This paper presents an advanced model of the frequency response of a three-phase power transformer for use in conjunction with diagnostic measurements by the method of frequency response analysis (FRA). The model includes high frequency behavior of the laminated core and the insulation through taking into account the frequency dependencies of the complex permittivity of insulation materials (paper, pressboard, and oil) and of the anisotropic complex permeability of magnetic core and conductors. A lumped parameter circuit model is used to simulate the frequency response of open-circuit impedance,short-circuit impedance, and impedance between primary and secondary windings, in which the characteristics of circuit elements are calculated by means of the finite-element method. The effect of correct representation of each circuit element on the FRA response is analyzed and discussed in comparison to measurement results on a real transformer.

Nyckelord: Finite-element method, frequency response analysis,high-frequency modeling, power transformer diagnostics



Denna post skapades 2008-09-29. Senast ändrad 2015-02-11.
CPL Pubid: 74553

 

Institutioner (Chalmers)

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

Ämnesområden

Elkraftteknik

Chalmers infrastruktur