DC Resistance windinding transformer testing

[Jed057]

Please explain me which IEC standard mention about max DC Resistance windinding value of oil transformer.
After my team test transformer .l was facing about
% difference resistance value between phase more than 3 % that could not accept from client.

 

[JLSeagull]

Check IEC 60076-8, Power transformers – Application guide.

 

[Zogzog]

Cant see your differential %, can you repost?