A Z-transform model of transformers for the study of electromagnetic transients in power systems

Author

Su, Q. ; James, R.E. ; Sutanto, D.

Author_Institution

Dept. of Electr. Power Eng., New South Wales Univ., Kensington, NSW, Australia

Volume

5

Issue

1

fYear

1990

fDate

2/1/1990 12:00:00 AM

Firstpage

27

Lastpage

33

Abstract

A Z-transform model, which combines transformer frequency-dependent short-circuit impedances with gain functions, has been developed. It sets up a relationship between transient voltages and currents on both sides of a transformer winding pair. The model can be used to calculate impulse responses of the transformers with open-circuit secondary winding as well as those connected to other networks. It could be incorporated into EMT (electromagnetic transient) programs for calculating the EMTs in power systems in which the distributed characteristics of transformer windings are to be considered

Keywords

Z transforms; power systems; power transformers; short-circuit currents; transients; EMT programs; Z-transform model; electromagnetic transients; gain functions; impulse responses; open-circuit secondary winding; power systems; transformer frequency-dependent short-circuit impedances; Circuits; Electromagnetic modeling; Frequency; Impedance; Power system modeling; Power system simulation; Power system transients; Surge protection; Transformers; Windings;

fLanguage

English

Journal_Title

Power Systems, IEEE Transactions on

Publisher

ieee

ISSN

0885-8950

Type

jour

DOI

10.1109/59.49082

Filename

49082