Non-Linear Inductance on Delta winding connection

Submitted by Neriton on Fri, 05/26/2023 - 10:23
Forums
General Discussion

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)

Mauro.Tonelli

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.
Mon, 06/19/2023 - 20:52 Permalink
X