DS/EN IEC 60076-11:2018/AC:2019

Power transformers - Part 11: Dry-type transformers

IEC 60076-11:2018 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. This second edition cancels and replaces the first edition published in 2004 and constitutes a technical revision. The main changes with regard to the previous edition are as follows:**- Extension of the scope up to 72,5kV**- Enclosure management in regards of the performance**- Management of the dielectric and thermal features with altitude**- New climatic classes for a better adaptation of customers’ need**- Establishment of the relation between location and environmental classes**- For fire behaviour classes, limitation at 1000kVA and process of test more robust**- Introduction of Seismic class**- Recommendations for amorphous transformers**Keywords: dry-type transformers