OVE EN IEC 60076-11

This part of IEC 60076 applies to dry-type power transformers (including auto-transformers) having values of highest voltage for equipment up to and including 72,5 kV and at least one winding operating at greater than 1,1 kV. This document does not apply to: • gas-filled dry-type transformers where the gas is not air; • single-phase transformers rated at less than 5 kVA; • polyphase transformers rated at less than 15 kVA; • instrument transformers; • starting transformers; • testing transformers; • traction transformers mounted on rolling stock; • flameproof and mining transformers; • welding transformers; • voltage regulating transformers; • small power transformers in which safety is a special consideration. Where IEC standards do not exist for the transformers mentioned above or for other special transformers, this document may be applicable as a whole or in parts.