Specification of the saturation characteristic for the model of the saturable transformer (Simulink Simscape Electrical - Specialized Power Systems)

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Hello everyone,
I am currently conducting research and I would like to use the Simulink model of the saturable transformer. According to the Matlab Help Center, when specifying the saturation characteristic, the magnetizing current is required.
I would like to clarify whether Matlab is referring to the current through the pure inductance L_sat (an inductive current) or if it includes the total current through the parallel branch of L_sat and R_m.
Thank you very much in advance for your assistance.
Best regards,
Torben

Accepted Answer

Vinay
Vinay on 1 Oct 2024
The "Saturable Transformer" utilizes the flux and magnetization current (`Im`) flowing through the inductor (`L_sat`) to assess the flux linkage. Additionally, it accounts for the excitation current (`IRm`) passing through the resistor(`Rm`) to incorporate the iron losses.
Kindly refer to the below documentation of “Saturable Transformer” for more details:
I hope this helps!
  3 Comments
Vinay
Vinay on 1 Oct 2024
Hi, The reactive current can indeed have a negative sign. This negative sign often appears because the inductive reactance is typically modeled with jωL, where L is the inductance. When modeling magnetization, the sign convention is based on the voltage-current relationship across the inductance. If the phase of the current lags the voltage by 90 degrees (as it does in inductive circuits), this can result in a reactive power that is conventionally negative, representing inductive behavior.
Torben
Torben on 2 Oct 2024
Hi,
Thank you for your response.
I have just realized that the model does not assume negative current values for the saturation characteristic.
Thank you for your support!

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