If the grounding transformer is lost a line-to-ground causes high phase-to-neutral voltages on the unfaulted phases and load unbalances can also cause neutral shifts and overvoltages. You need to be aware though that since by using these transformers you forfit ground protection. Mike Holt Grounding Vs Bonding 2014 Grounding Vs Bonding Electrical Engineering Electrical Diagram Electrical Symbols Obviously a device should not offer a grounded socket if it doesnt have any source to obtain ground from. Should transformer be grounded . Smaller dry-type transformers may not have this ground but it is always used on larger transformers. In a wye configuration one end of each of the three windings is connected to form a neutral. If the secondary goes to ground it is screwed down to grounded metal. Transformers that are magnetic are going to create heat. Even on a grounded electrical system the fault current through earth might not be high enough to trip the breaker. Where supplie...