How to calculate Main Gap between LV and HV?

[Borishnikov]

Need help here guys...
I need to calculate the air gap(main Gap, between windings) but not too sure.

Got:
30/40/50//56MVA-55//65-ONAN/ONAF/ONAF//ONAF-3-60-230000/132791Y-66000
LV 350kV BIL
Ho 110kV BIL
HV 950kV BIL
900V/mil
core area:2590.2cm^2
B=1.7
%IZ = 8.5%@75 C rated voltage ONAN

Thank you for your time

 

[jbartos]

Suggestion: Visit

http://www.globalspec.com/ProductFinder/QuickSearch?query=transformer winding&se=ggka&setag=EMSS

for:
Transformer Winding Engineering Web Results