Power Transformers typical impedance values

[tctctraining]

We are working on a project and need to define typical ( conservative ) impedance values for Delata-Wye and Wye-G, Wye-G, Delta transformers. Transformers are 18/25/30 Mva 230kV/34.5 kV. Where can I find these typical values?
I apprecite your responces.

 

[davidbeach]

Try the IEEE Red Book.

 

[dpc]

Also, there are standard impedance values given in ANSI C57 - based on the high side BIL. If you don't have access to ANSI C57, any transformer manufacturer can give you the standard impedances.

 

[prc]

To know generally specified impedance values for transformers around the world, refer to IEC TR60909-2 ed2.0(2008-11) Data for electrical equipment for short circuit current calculations.