scope:

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.