EN 50708-1-2:2021

SLOVENSKI STANDARD
01-februar-2022
Močnostni transformatorji - Dodatne evropske zahteve - 1-2. del: Skupni del -
Ocena energetskih lastnosti
Power transformers - Additional European requirements: Part 1-2 Common part -
Assessment of energy performance
Ta slovenski standard je istoveten z: EN 50708-1-2:2021
ICS:
27.015 Energijska učinkovitost. Energy efficiency. Energy
Ohranjanje energije na conservation in general
splošno
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50708-1-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2021
ICS 29.180
English Version
Power transformers - Additional European requirements: Part 1-
2 Common part - Assessment of energy performance

Transformateurs de puissance - Exigences européennes
supplémentaires: Partie 1-2 Partie commune - Evaluation
des performances énergétiques
This European Standard was approved by CENELEC on 2021-09-27. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50708-1-2:2021 E
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Assessment of compliance . 5
5 Declaration of conformity and CE Marking . 6
6 Technical documentation . 7
7 Level of assessment . 7
7.1 General . 7
7.2 Delegation for tests . 8
7.3 Tolerances for assessment process . 8
8 Sampling . 8
Bibliography . 9

European foreword
This document (EN 50708-1-2:2021) has been prepared by CLC/TC 14 “Power transformers”
The following dates are fixed:
• latest date by which this document has to be (dop) 2022-09-27
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2024-09-27
conflicting with this document have to be
withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission and the
European Free Trade Association.
Any feedback and questions on this document should be directed to the users’ national committee. A complete
listing of these bodies can be found on the CENELEC website.
FprEN 50708-1-2:2021 (E)
Introduction
This document defines the rules for the assessment of energy performance by any interested stakeholders (for
example manufacturers, suppliers and importers as well as users etc.) for example to provide a means of
demonstrating the product conformity to the Commission Regulation (EU) 548/2014 of 21 May 2014 and
Commission Regulation (EU) 2019/1783 of 1 October 2019 amending Regulation (EU) No 548/2014 on
implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to small,
medium and large power transformers.
NOTE In the document, the term Regulation refers to the EU Regulation 548/2014 and amendment 2019/1783.
This document contains particular requirements for specific transformers or transformer applications, which are
based on the requirements of the general EN 50708-1-1:2020.
This document should be considered in conjunction with the requirements of the general parts.
The particular requirements of the different sub parts of EN 50708 supplement, modify or replace certain
requirements of the general parts of EN 50708-1 and/or EN 50708-1-X being valid at the time of publication of
this document. The absence of references to the exclusion of a part or a clause of a general part means that
the corresponding clauses of the general part are applicable (undated reference).
Requirements of other -X parts with X greater than 1 being eventually relevant for cases covered by this
document also apply. This document could therefore also supplement, modify or replace certain of these
requirements valid at the time of publication of this document.
The main clause numbering of each part follows the pattern and corresponding references of
EN 50708-1-1:2020. The numbers following the particular number of this document are those of the
corresponding parts, or clauses of the other parts of the EN 50708 series, valid at the time of publication of this
document.
In the case where new or amended general parts with modified numbering were published after the sub part
was issued, the clause numbers referring to a general part in sub parts might no longer align with the latest
edition of the general part. Dated references should be observed.
1 Scope
This document applies to all power transformers in scope of TC 14.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references, the
latest edition of the referenced document (including any amendments) applies.
EN 45014, General criteria for supplier’s declaration of conformity (ISO/IEC Guide 22)
EN 50708-1-1:2020, Power transformers - Additional European requirements: Part 1-1: Common part - General
requirements
EN 50708 (series), Power transformers
EN 60076-1, Power transformers - Part 1: General (IEC 60076-1)
EN 60076-19, Power transformers - Part 19: Rules for the determination of uncertainties in the measurement of
the losses on power transformers and reactors (IEC 60076-19)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50708 series apply.
ISO and IEC
...