Calculation of the X0/R0 ratio for a Zig Zag transformer

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ouza2802

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Quebec
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Electrical Engineer
I'm trying to calculate the X0/R0 ratio of a Zig Zag transformer. I got the following information:
-Winding connection: Zig Zag
-Short time neutral current: 3500 A 5 sec.
-Continuous neutral current : 250 A
-Voltage : 26.4 kV
-Zero sequence impedance: 7.5 ohms/ph
-No load losses: 1951 W
-Load losses : 18214 W

I looked at the standard IEEE C57.12.91, but could not find a specific example for a Zig-Zag transformer. How do we calculate the X0/R0 ratio using these informations?

Thanks!
 
Why are you doing this?
These transformers are usually used for creating neutrals for bonding, in which case they intentionally have little to no impedance to zero sequence currents.
 
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