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What is the practical Importance of No load Excitation current and what exactly it tells about the transformer. Is there any limit of this current. When test engineer specify this as % age on test report than whether its the %age of LV or % of HV or it depends which side we are giving excitation...

Can soomeone tell me for a Pad Mounted Transformer to be UL listed (In USA) as a whole, whether all the Material, Parts, Fittings and Accessories need to be UL listed individually. or whether there are some particular components and Fittings which need to be UL listed only for a Pad mounted...

What will happen if I use Grounded Y on 12.47 Kv side and not use Grounded Y on LV side. i.e YNy0? I was reading C57.159-2016 and it suggest that grounded connection should not be used on LV side of transformer connected to inverter in solar plant. Is there any specific reason for this?

I am using a Transformer in solar project where my inverter will give output of 600V, I have to step up this voltage to 12.47kV system which will be connected to utility. The existing infrastructure of utility is 12.47kV delta. I am thinking to use YNy0 transformer but not sure. Can someone...