This standard applies to gas-filled power transformers (including auto-transformers). The
standard applies to all construction technologies.
This standard does not apply to
– single-phase transformers with rated power less than 1 kVA and three-phase
transformers less than 5 kVA;
– dry-type transformers (see IEC 60076-11);
– instrument transformers (see IEC 60044);
– starting transformers;
– testing transformers;
– traction transformers mounted on rolling stock;
– welding transformers.
Where IEC standards do not exist for the transformers mentioned above or for other special
transformers, this standard may be applicable as a whole or in parts.
NOTE This standard can be applicable to the gas parts of a transformer in which an insulating gas is used with an
insulating liquid.