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Secondary Tapped Transformer

Secondary Tapped Transformer

Secondary Tapped Transformer

(OP)
Good day,

We're performing electrical short circuit and arc flash studies for a customer who has wind turbine generators that supply to a 2-Winding transformer.

Now the problem is, this 2 winding transformer has a tapped secondary which supplies an external load of 400V.

Therefore, the transformer acts as a three winding transformer. Primary is rated 34.5 kV, secondary is 1000V and the tapped secondary (that acts as a tertiary) is 400V.

I have to provide both positive and zero sequence PS, PT and ST impedances for SKM. All I have from manufacturer are the attached files.

I have been using load losses to calculate for R value (using PLoss = 3xI^2xR) at secondary and tertiary, and use them for Zs and Zt (not Zps or Zpt).

I then use Zps = Zp+Zs, Zst=Zs+Zt and Zpt = Zp+Zt.

Using the test certificate from Siemens, I have measurement of load losses at secondary and so called tertiary, however I'm stuck at how to determine the R value for Zp.

Hope i've been clear explaining my problem, any help is much appreciated. Remember again, this not a typical 3 winding transformer but a 2-winding transformer with a tapped secondary supplying external loads.

Thank you.

Regards


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