It not help me a lot. So, I need to make calculation of the zero sequence impedance (Ohms per phase) for a few different 3-phase distribution transformer designs: YNzn, ZNyn and ZNzn vector group.
I need to calculate reactance of zigzag earthing transformer, i.e. ZNzn vector group transformer.
I have designed before star/zigzag transformer (ZNyn) and I know how to calculate leakage reactance of that type vector group transformer.
But, now I need formula for leakage reactance X for...