Comitato Elettrotecnico Italiano

Energy performance of large power transformers (Um > 36 kV or Sr 40 MVA)
 N EN 50629

Annotation

This European Standard applies to new three-phase and single-phase power transformers with a highest voltage for equipment exceeding 36 kV and a rated power equal or higher than 5 kVA, or a rated power equal to or higher than 40 MVA regardless of the highest voltage for equipment.

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.

NOTE 1 This standard covers the transformers under the EU Regulation N. 548/2014 and gives additional specific guidance for single phase transformers, autotransformers, multi winding transformers and for transformers with OD and OF cooling systems, necessary for the correct application of energy efficiency requirements to these categories of transformers.

Transformers considered to be out of the scope of this document are the following:

- instrument transformers, specifically designed to supply measuring instruments, meters, relays and other similar apparatus,