scope:

This European Standard applies to new three-phase and single-phase power transformers with Um > 36 kV. The scope of this European Standard is the following:- Defining the appropriate energy efficiency criteria;- Setting of benchmark minimum efficiency levels for new transformers based on an assessment of the energy efficiency of the European transformer population installed in the last 10 years;- Proposing higher minimum efficiency levels for improving the energy efficiency of new transformers;- Providing guidance for consideration of Total Cost of Ownership.This European Standard provides also a form for efficiency data collection to inform future efficiency benchmark levels.Transformers considered to be out of the scope of this document are the following:- Instrument transformers;- Earthing transformers;- Traction transformers on rolling stock;- Starting transformers;- Testing transformers;- Welding transformers;- Explosion-proof and underground mining transformers;- Transformers for deep water (submerged) applications.