High-frequency modeling of power transformers for use in frequency response analysis (FRA)
Journal article, 2008

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.

frequency response analysis

Finite-element method

power transformer diagnostics

high-frequency modeling

Author

Nilanga Abeywickrama

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

Yuriy Serdyuk

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

Stanislaw Gubanski

Chalmers, Materials and Manufacturing Technology, High Voltage Engineering

IEEE Transactions on Power Delivery

0885-8977 (ISSN)

Vol. 23 4 2042-2049

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering

More information

Created

10/8/2017