Hello :) , i m an electronic engineer, n working in a power projects construction company (a electrical work), i m working on Lightning arrester & voltage transformer panel (LAVT), neutral geounding transformer (NGT) panel (part of the generator diff protection). There is a power transformer of 11/220kV, n for the connection between generator - power transfomer, NGT & LAVT , a 11kv iso lated phase busduct is used, i need to know the design criteria for this system. If anyone having the similar material for desgining purpose (of any rating) please send me..... :)