Thnaks for your reply Alehman.
The neutral of the output transformer in this case is grounded and neutral is oversized to the same size as phase conductors. However it may be difficult to minimize neutral current because of imbalance in load.
How about a single phase dedicated UPS in this case...
We need to achieve N-G voltage of less than 0.250volts for a sensitive electronic equipment. This equipment is fed from phase to neutral of a three phase UPS with dedicated clean earth pits (resistance 1 ohm).
1) The UPS has imbalance capabilities with an output isolation transformer which is...
