I was asked to install a small consumer unit at the end of step down transformer. The consumer unit is fed from a panel board put in place for a future wind turbine project . The consumer unit feeds a socket and a light. This is all in a metal container that is earth roded with bare tape and rods. Now I checked my voltages at my income r of panel board and everything was okay apart from one phase was 20 volts higher than the others with respect of earth and neutral. I connected up my board to test my loop impedances and when a load goes on the board the neutral reaches 3 phase voltage when measured to other phases and 240 to earth. I figured the neutral must be gone but when measuring with no load on system everything seems fine . From the transformer plates they are delta delta and the neutral is through crimped. I'm told the reason for the step up - down transformer is because upsizing the cable would cost the same but would impossible to work with. I have no knowledge of design of this level of work, should the neutral be larger and,as it is it's to high a resistance for a return. It's got me stumped and it was supposed to be a simple job. Long winded I know.
Thanks for all help given
Thanks for all help given