Three-phase, three-winding transformer parameters

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How to calculate the following values in a three-phase, three-winding transformer? I need to model this transformer in MATLAB/Simulink (attached block from Simulink).
1. Individual resistances (R1, R2, R3) of each winding?
2. Individual leakage inductances (L1, L2, L3) of each winding?
3. Overall magnetizing resistance and inductance (Rm, Lm)?
The following values are given on the transformer nameplate.
Power = 12.75kVA
Primary Winding: Wye, 460V, 16A
Secondary Winding: Wye, 11.5V, 320A
Tertiary Winding: Delta, 11.5V, 320A
Percentage impedance = 5.2%

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