IEC 60076-11 Ed. 2.0 b:2018

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.A 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