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Modelling of transformers in PSS/E Figure 1 represents the internal PSS/E model for the two winding transformer model and Figure 2 resents its approximated transformer model. In this model Z represents the series impedance and Ym represents the magnetizing admittance [1],[2].

Figure 1: PSS/E Transformer models of two winding transformer model

Figure 2: Standard PSS/E two winding Transformer circuit

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Modelling of two winding transformers in PSS/E requires following minimum parameters. They are, Winding 1& 2 ratio (pu) = 1pu:1pu ratio was set in the model.

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Winding 1&2 Nominal Voltage (kV) = Respective voltages of the buses was entered in the model.

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Winding MVA = 100MVA which is the default power base was set.

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Rate A (MVA) = Transformer capacity.

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Rate B (MVA) = The contingency rating is set 120% of the Rate A.

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Series Resistance R (pu) = assumed to be negligible.

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Series Reactance X (pu) = Since the series resistance was assumed to be negligible, reactance (X) was assumed to be equal to the percentage impedance (Z).

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Shunt Conductance G (pu) = Assumed to be negligible.

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Shunt Susceptance B (pu) = Assumed to be negligible.

References

[1]

“PSS®E 33.2 Program Operation Manual.” Siemens Industry, Inc. Siemens Power

Technologies International. [2]

“Transformers in the positive sequence,” in Program Application Guide, vol. 1, 2 vols.,

SEIMENS.