I was working (mostly learning) on a power system the other day. Single primary transformer winding 22kV and 2 secondary windings, one is WYE one in DELTA - for load balancing i think. Secondary WYE neutral is not earth. For the following you can assume i'm talking about the WYE side of the...
Been having some big DC motors (1mW) blow up. Potential problem noted. On the AC 3 phase side, there was a surge protector that was shorted to earth. This was 610V secondary of a YYN0 transformer. The neutral was not used and is not earthed. So say phase A is at earth potential... the plant...
