prEN 50708-1-1:2023

SLOVENSKI STANDARD
01-oktober-2023
Močnostni transformatorji - Dodatne evropske zahteve - 1-1. del: Skupni del -
Splošne zahteve
Power transformers - Additional European requirements - Part 1-1: Common part -
General requirements
Leistungstransformatoren - Zusätzliche europäische Anforderungen - Teil -1-1:
Allgemeiner Teil - Allgemeine Anforderungen
Transformateurs de puissance - Exigences européennes supplémentaires : Partie 1 -
Partie commune
Ta slovenski standard je istoveten z: prEN 50708-1-1:2023
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD DRAFT
prEN 50708-1-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2023
ICS 29.180 Will supersede EN 50708-1-1:2020; EN 50708-1-
1:2020/AC:2020-12
English Version
Power transformers - Additional European requirements -
Part 1-1: Common part - General requirements
Transformateurs de puissance - Exigences européennes Leistungstransformatoren - Zusätzliche europäische
supplémentaires : Partie 1 - Partie commune Anforderungen - Teil -1-1: Allgemeiner Teil - Allgemeine
Anforderungen
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2023-11-03.

It has been drawn up by CLC/TC 14.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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,
Türkiye and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

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
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 73196 Ref. No. prEN 50708-1-1:2023 E

Contents . Page
European foreword . 4
Introduction. 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Service condition . 12
5 Ratings and general requirements . 12
5.1 Rated power . 12
5.2 Rated frequency . 13
5.3 Energy performance . 13
5.3.1 Energy performance requirements. 13
5.3.2 Exclusion from energy performance requirements . 13
5.3.3 Reference conditions . 14
5.4 Material efficiency . 14
5.4.1 General . 14
5.4.2 Durability and reliability . 15
5.4.3 Ability to remanufacture . 15
5.4.4 Ability to repair, reuse and upgrade . 15
5.4.5 Recyclability and recoverability . 16
5.4.6 Proportion of reused major components . 16
5.4.7 Proportion of recycled content . 16
5.4.8 Use of critical raw materials . 17
5.5 Sustainability . 17
5.6 Technical documentation . 17
5.6.1 General . 17
5.6.2 Recyclability and recoverability . 18
5.6.3 Proportion of recycled content . 18
5.6.4 CO equivalent emission . 18
5.6.5 Accessory and major component data . 18
5.6.6 Critical raw materials (CRMs) . 19
6 Rating plate . 19
7 Tolerances . 19
7.1 Tolerance during acceptance tests . 19
7.2 Tolerances for market surveillance . 20
8 Tests . 20
8.1 General . 20
8.2 Measurement of cooling consumption . 20
9 Accessories and fittings . 20
10 Capitalization of losses . 20
11 Transformer reprocessing . 21
Annex A (normative) Peak efficiency calculation . 22
Annex B (informative) Capitalization of losses. 25
Annex C (informative) A-deviations . 31
Annex D (informative) Additional considerations related to energy performances . 32
Annex ZZ (informative) Relationship between this European Standard and the ecodesign requirements
of Commission Regulation (EU) No 548/2014 of 21 May 2014 and its amendment No 2019/1783 of 1
October 2019 on implementing Directive 2009/125/EC of the European Parliament and of the Council
with regard to small, medium and large power transformers aimed to be covered . 34
European foreword
This document (prEN 50708-1-1:2023) has been prepared by CLC/TC 14, “Power transformers”.
The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
This document will supersede EN 50708-1-1:2020 and all of its amendments and corrigenda (if any).
EN 50708-1-1:2023 includes the following significant technical changes with respect to
EN 50708-1-1:2020:
— The EN 50708-1-1:2020/AC:2020 Corrigendum has been included in the standard.
— The comments received from NCs not allowed in the corrigendum have been taken into account.
— The new topic ‘Material efficiency’ has been added side to energy performance in the prospective
of power transformer ‘Sustainability’.
This document has been prepared under a Standardization Request given to CENELEC by the
European Commission and the European Free Trade Association, and supports essential requirements
of EU Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZZ, which is an integral part
of this document.
Introduction
The EN 50708 series, “Power transformers – Additional European requirements”, has been prepared
by CENELEC TC 14 to address specific European requirements of power transformers related EU
Regulations and local practices.
Technical requirements set by the EN 50708 series supplement, modify or replace certain requirements
of the other EN standards derived from equivalent IEC international standards.
This series contains general requirements on energy performance, accessories, fittings, tests,
mechanical requirements etc. structured as follows:
— Part 1 series - Common requirements;
— Part 2 series - Medium power transformers;
— Part 3 series - Large power transformers.
The EN 50708-X parts with X greater than 1 contain particular requirements for a different category of
transformers or transformer applications which are based on the requirements of the general parts of
EN 50708-1-1.
The EN 50708-X parts should be considered in conjunction with the requirements of the general part.
The particular requirements of these subparts of EN 50708 supplement, modify or replace certain
requirements of the general parts of EN 50708-1-1 and/or EN 50708-1-X being valid at the time of
publication of this part. 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 part also apply. This part therefore possibly supplements, modifies or replaces certain of these
requirements valid at the time of publication of this document.
The main clause numbering of each subpart follows the pattern and corresponding references of
EN 50708-1-1. The numbers following the particular number of this part 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 part,
as indicated in the normative references of this document (dated reference).
In the case where new or amended general parts with modified numbering were published after the
subpart was issued, the clause numbers referring to a general part in subparts might no longer align
with the latest edition of the general part. Dated references should be observed.
It is acknowledged that environmental requirements including energy in the use phase are a significant
aspect that can be addressed through product design. As the material content increases to improve
energy performance, it is advisable to make a proper life cycle assessment including recycling of the
extra raw material and the overall energy used to produce and transport transformers. Some guidelines
are given in EN 60076-1.
1 Scope
This document is part of the EN 50708 series which applies to transformers in compliance with
EN 60076-1.
2 Normative references
The following documents are re
...