Title :
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
fDate :
2/1/1990 12:00:00 AM
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;
Journal_Title :
Power Systems, IEEE Transactions on
