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Reply To: Transformer riddle no.18 – Transformer insulation test

#1608
R K Mohapatra

    There are no National or Inteernational standard for acceptance value of IR in Power transformer .This is because of the dependancy of the IR value on a no of factors like Amount of IOnsulations , Tyope of insulation , clerance from earth point , water absorption capacity of the insulatuing material and temperature of the transformer etc . The acceptance value is an agreement bett the supplier and the customer . However a reasonably accepted factor is 1 mega Ohm per kv at 60 C subject to minimum 500 Mega ohm .