BS EN 50629 : 2015

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Efficiency and Efficiency Index calculation
5 Minimum Peak Efficiency Index values
6 Transformers categories currently excluded
7 Capitalisation of losses
Annex A (normative) - Minimum PEI for dry type large
        power transformers
Annex B (informative) - Peak Efficiency Index formula,
        graphs and calculations
Annex C (informative) - Form for data requested
Annex D (informative) - Benchmark of Peak Efficiency Index
Annex E (informative) - Capitalisation of losses
Annex F (informative) - Background on verification
        tolerances during market surveillance
Annex ZZ (informative) - Relationship between this
         European Standard and the requirements of
         Commission Regulation (EC) No 548/2014 of
         21 May 2014 on implementing Directive 2009/125/EC
         of the European Parliament and of the Council with
         regard to small, medium and large power transformers
Bibliography

Pertains 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.