Analytical model of a T-connected three-phase transformer

Guy Olivier, Radu Cojocaru and Anthony Lefèvre

Mathematics and Computers in Simulation (MATCOM), 2003, vol. 63, issue 3, 407-419

Abstract: Three-phase transformers usually consist of three sets of windings connected in Wye, delta or zigzag on three individual cores or on a single three-phase one. Two single-phase transformers can also be used in a less than well-known way called the T-connection. Depending on the actual connection, as in conventional three-phase transformers, secondary voltages are in phase or displaced by ±30°. Due to the reduced number of windings, the T-connected transformer can be economically produced. However, since it is an asymmetrical connection, the short-circuit impedances of the individual phases are not identical, leading to unbalanced load voltages and short-circuit currents. An analytical model of the T-connected transformer has been developed to evaluate the effects of the impedance unbalance. This model based on single-phase short-circuit tests can be used to determine voltage unbalances, active and reactive transformer losses and short-circuit impedances.

Keywords: T-connection; Three-phase transformer; Winding (search for similar items in EconPapers)
Date: 2003
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Persistent link: https://EconPapers.repec.org/RePEc:eee:matcom:v:63:y:2003:i:3:p:407-419

DOI: 10.1016/S0378-4754(03)00085-5

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