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From all the replies and your rebuts, it is clear that most of the things have been done. Ratio checks, magnetisation curves for the line and neutral CTs. Since you are are able to put a minimum load and only trips when you put the camp load. It looks to me that you could have a loose...

I agree with Gunnar that such kind of load needs its own single phase transformer. If for arguments sake, the transformer supplying the other loads(motors) is a 66/6.6kV, then this particular transformer needs to be connected to the 66 kV bus so that voltage distribution for the three phases...

I also believe this is the best place for any hot issues that you might have looking at the responses i got with my posting. Sometimes the issues we have may not be bordering on protection oversight but because of the broader spectrum of people we have on this forum, somebody will say something...

Thank you very much for all the replies. Let me build up a good case(get more information)so the speculations can come to an end and i am quite confident your suggestions will go a long way.

From the time i joined my organization, i have witnessed failures of 5 x 10 MVA, 33/11kV, Delta/Star transformers at one particular substation. They all fail in the same manner with the LV winding being down to earth. The latest one only worked for 6 months from the time it was installed. We...