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Non-Linear Inductance on Delta winding connection

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  • 31 July 2025 at 15h00 #7041
    anonymous
    Keymaster

    I want to adapt the example present in ~EMTPWorks\Examples\ApplicationCases\Transformer_data\TestExample\TransformerModel in the case of a magnetizing branch connected in the delta connection of the transformer (tertiary side).

    The “L nonlinear” block is used to convert the I-V curve to I-phi curve.

    1) However, I do not know if I have to use the phase-to-ground voltage for the base (as in the example) or the phase-to-phase voltage.

    2) Also in the example the power base in divided by 3 (10 MVA used in the L nonlinear block but the no-load test is made for 30MVA). This division is also necessary for the delta connection?

    3) The current of the no-load test given in % are given by I = P/V (single phase system) or I = P/sqrt(3)*U (three-phase system)

    31 July 2025 at 15h00 #7043
    anonymous
    Keymaster

    Dear Sir or Madam,

    Please, see my insights below.

    The “”L nonlinear”” block is used to convert the I-V curve to I-phi curve.

    1) However, I do not know if I have to use the phase-to-ground voltage for the base (as in the example) or the phase-to-phase voltage.
    A.: The voltages, for the delta connection, are the same (phase voltage = line voltage). You should consider the voltage applied to the winding.

    2) Also in the example the power base in divided by 3 (10 MVA used in the L nonlinear block but the no-load test is made for 30MVA). This division is also necessary for the delta connection?
    A.: Yes. You will be building a per phase model.

    3) The current of the no-load test given in % are given by I = P/V (single phase system) or I = P/sqrt(3)*U (three-phase system)
    A.: The current will be per phase.

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