Simplified three-phase transformer model for electromagnetic transient studies

TitleSimplified three-phase transformer model for electromagnetic transient studies
Publication TypeJournal Article
Year of Publication1995
AuthorsCHIMKLAI, S., and J. R. Marti
JournalPower Delivery, IEEE Transactions on
Pagination1316 -1325
Date Publishedjul.
Keywords60 Hz, computer simulation, digital simulation, electromagnetic transient studies, EMTP, equivalent circuit, equivalent circuits, frequency-dependent short-circuit branch, high-frequency model, minimum-phase-shift rational approximation, numerical stability, power engineering computing, power system transients, power transformers, RLC equivalent network, software packages, T-form, three-phase transformer model, transformer windings, winding capacitances

This paper presents a simplified high-frequency model for three-phase, twoand three-winding transformers. The model is based on the classical 60 Hz equivalent circuit, extended to high frequencies by the addition of the winding capacitances and the synthesis of the frequency-dependent short-circuit branch by an RLC equivalent network. By retaining the T-form of the classical model, it is possible to separate the frequency-dependent series branch from the constant-valued shunt capacitances. Since the short-circuit branch can be synthesized by a minimum-phase-shift rational approximation, the mathematical complications of fitting mutual impedance or admittance functions are avoided and the model is guaranteed to be numerically absolutely stable. Experimental tests were performed on actual power transformers to determine the parameters of the model. EMTP simulation results are also presented


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