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Exactly what I was planning to do but the neutral is only a stub bushing and will only take around 10 to 12 kv .

I have a 22KV 3 phase VT with the star point going to a small bushing before being Earthed. I need to do a pressure test on the VT . It has been some years since I have done this and cannot remember how. I seem to remeber leaveing the earth conected and just putting the HV on the 3 bushings...

Addressing problem 3 We generally check for free water and drain off until free of water then take the sample. When back at the lab we always leave the sample at least an hour until it reaches ambient temp of the lab. This eliminates any suspicious results you seem to be getting. Phil

I agree with ausphil. We use exactly the same principle and in some cases also install online PD capacitors witch we monitor every 6 months.