Neutral to Ground Voltage

Sure...I agree with comments from PWSlack and Wareagle.

Dear Sirs,

Thanks for your kind co operation, but I forgot to write you that I have 3 generators which is supplying to same set of loads. But they are working one at a time. Their neutrals are shorted together with a single busbar.

Now when I checked voltage between Neutral and Earth for other two generators, say A & B, it remains zero. But when I use third generator say 'C', fuse connected to control wiring at load side blows off. I measured the voltage between Neutral and Earth for this generator and I observed that this voltage is increasing gradually. Last week it was 10V, and this week it increased to 11V.

When other two generators A or B, operates the same load, then voltage between Neutral and earth remains zero.

I personally feel that if load balancing is the problem which is causing neutral current to flow, then I should face this problem with other two generators also.

I am trying to check generator 'C' alone without load (single phase or 3 phase), to check voltage exist between Neutral and Earth.

Please tell If I find that voltage exist between Neutral and Earth without load then what should I do? It is a 10 Wires Star connected 1000 KVA CATerpiller Generator.

Thanks.

1. check your star point becaz if phase unbalacing is occured then why not triping equipments are working

2. change the star i.e open your star and make the opened ends star