A high frequency transformer model for the EMTP

Author

Morched, A. ; Marti, L. ; Ottevangers, J.

Author_Institution

Ontario Hydro, Toronto, Ont., Canada

Volume

8

Issue

3

fYear

1993

fDate

7/1/1993 12:00:00 AM

Firstpage

1615

Lastpage

1626

Abstract

A model to simulate the high-frequency behavior of a power transformer is presented. This model is based on the frequency characteristics of the transformer admittance matrix between its terminals over a given range of frequencies. The transformer admittance characteristics can be obtained from measurements or from detailed internal models based on the physical layout of the transformer. The elements of the nodal admittance matrix are approximated with rational functions consisting of real as well as complex conjugate poles and zeroes. These approximations are realized in the form of an RLC network in a format suitable for direct use with the ElectroMagnetics Transient Program (EMTP). The high-frequency transformer model can be used as a stand-alone linear model or as an add-on module of a more comprehensive model where iron core nonlinearities are represented in detail.<>

Keywords

approximation theory; digital simulation; high-frequency transformers; matrix algebra; poles and zeros; power system analysis computing; power transformers; transformer cores; EMTP; ElectroMagnetics Transient Program; HF; RLC network; admittance matrix; approximations; conjugate poles and zeroes; digital simulation; frequency characteristics; high frequency transformer model; iron core nonlinearities; power system analysis computing; power transformer;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.252688

Filename

252688