EN 50708-2-5:2021

SLOVENSKI STANDARD
01-november-2021
Močnostni transformatorji - Dodatne evropske zahteve - 2-5. del: Srednji
močnostni transformator - Enofazne naprave
Power transformers - Additional European requirements - Part 2-5: Medium power
transformer - Single phase
Transformateurs de puissance - Exigences européennes supplémentaires - Partie 2-5 :
Transformateurs de moyenne puissance monophasés
Ta slovenski standard je istoveten z: EN 50708-2-5:2021
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50708-2-5

NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2021
ICS 29.180
English Version
Power transformers - Additional European requirements - Part 2-
5: Medium power transformer - Single phase
Transformateurs de puissance - Exigences européennes
supplémentaires - Partie 2-5 : Transformateurs de moyenne
puissance monophasés
This European Standard was approved by CENELEC on 2021-07-05. 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 50708-2-5:2021 E
Contents
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Service conditions . 5
5 Rating and general requirements. 5
5.1 General . 5
5.2 PEI values for single-phase liquid immersed transformers . 6
6 Rating plate. 6
7 Tolerances . 6
8 Tests . 6
9 Accessories and fittings . 6
10 Capitalization of losses . 7
11 Transformers overhaul . 7
Bibliography . 8

European foreword
This document (EN 50708-2-5:2021) has been prepared by CLC/TC 14 “Power transformers”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2022–07–05
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2024–07–05
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.
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.
Introduction
This part is a part of EN 50708 series deals with the energy performance of liquid single-phase
Medium Power Transformers.
For the purpose of this document, the requirements of the general EN 50708-1-1:2020 apply.
This
...