what are the standard IR values should be of R-E, Y-E, B-E, R-Y, Y-B, B-R of V

what are the standard IR values should be of R-E, Y-E, B-E,
R-Y, Y-B, B-R of VCB in closed condition and in open
condition for 500KVA & 1000KVA transformers. and what is the
acceptable range when tested by 5000V megger.

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