Power transformers - Additional European requirements: Part 3-1 Large power transformer - General requirements

The scope of this document is to define performance requirements of Large Power Transformers in compliance with prEN 50708 1 1:2019.
NOTE    This document covers the transformers under the EU Regulation N. 548/2014 and Amendment of 2019, 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.

Leistungstransformatoren - Zusätzliche europäische Anforderungen - Teil 3-1: Große Leistungstransformatoren

Transformateurs de puissance - Exigences européennes supplémentaires: Partie 3-1 : Transformateurs de grande puissance

Le domaine d'application du présent document consiste à définir les exigences de performances des transformateurs de grande puissance selon le prEN 50708 1 1:2019.
NOTE    Le présent document couvre les transformateurs relevant du règlement UE N° 548/2014 et de son amendement de 2019, et donne des recommandations spécifiques supplémentaires pour les transformateurs monophasés, les autotransformateurs, les transformateurs à plusieurs enroulements et pour les transformateurs ayant des systèmes de refroidissement OD ("Oil-Directed", à circulation dirigée d’huile) et OF ("Oil-Forced", à circulation forcée d’huile), nécessaires à la bonne application des exigences en matière de rendement en énergie de ces catégories de transformateurs.

Močnostni transformatorji - Dodatne evropske zahteve - 3-1. del: Veliki močnostni transformator - Splošne zahteve

General Information

Status
Published
Publication Date
28-May-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-May-2020
Due Date
02-Aug-2020
Completion Date
29-May-2020

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SLOVENSKI STANDARD
SIST EN 50708-3-1:2020
01-julij-2020
Nadomešča:
SIST EN 50629:2015
SIST EN 50629:2015/A1:2016
SIST EN 50629:2015/A2:2018

Močnostni transformatorji - Dodatne evropske zahteve - 3-1. del: Veliki močnostni

transformator - Splošne zahteve
Power transformers - Additional European requirements: Part 3-1 Large power
transformer - General requirements

Transformateurs de puissance - Exigences européennes supplémentaires: Partie 3-1 :

Transformateurs de grande puissance
Ta slovenski standard je istoveten z: EN 50708-3-1:2020
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN 50708-3-1:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50708-3-1:2020
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SIST EN 50708-3-1:2020
EUROPEAN STANDARD EN 50708-3-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 29.180 Supersedes EN 50629:2015 (PART) and all of its
amendments and corrigenda (if any)
English Version
Power transformers - Additional European requirements: Part 3-
1 Large power transformer - General requirements
Transformateurs de puissance - Exigences européennes To be completed
supplémentaires: Partie 3-1 : Transformateurs de grande
puissance

This European Standard was approved by CENELEC on 2019-10-09. 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

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50708-3-1:2020 E
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SIST EN 50708-3-1:2020
EN 50708-3-1:2020 (E)
Contents Page

European foreword ............................................................................................................................................ 3

Introduction ........................................................................................................................................................ 4

1 Scope ..................................................................................................................................................... 5

2 Normative references ........................................................................................................................... 5

3 Terms and definitions .......................................................................................................................... 5

4 Service condition .................................................................................................................................. 5

5 Rating and general requirements........................................................................................................ 5

5.1 Energy performance requirements ..................................................................................................... 5

5.1.1 General ................................................................................................................................................... 5

5.1.2 Minimum PEI values ............................................................................................................................. 5

5.1.3 Optimization of transformer losses according to application ......................................................... 8

6 Rating plate ........................................................................................................................................... 8

7 Tolerances ............................................................................................................................................. 8

8 Acceptance Tests ................................................................................................................................. 8

9 Accessories and fittings ...................................................................................................................... 8

10 Capitalization of losses ........................................................................................................................ 8

11 Transformers overhaul ......................................................................................................................... 8

Annex A (Informative) Peak Efficiency Index formula, graphs and calculations ....................................... 9

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 ........................................................................................ 14

Bibliography ..................................................................................................................................................... 16

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SIST EN 50708-3-1:2020
EN 50708-3-1:2020 (E)
European foreword

This document (EN 50708-3-1:2020) has been prepared by CLC/TC 14, “Power transformers”.

The following dates are fixed:
• latest date by which this document has (dop) 2020-11-22
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2023-05-22
standards conflicting with this document
have to be withdrawn

This document supersedes EN 50629:2015 and all of its amendments and corrigenda (if any).

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, and supports requirements of Commission Regulation (EC).

For the relationship with requirements of Commission Regulation (EC) see informative Annex ZZ, which is an

integral part of this document.
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SIST EN 50708-3-1:2020
EN 50708-3-1:2020 (E)
Introduction

For the purpose of this document, the requirements of the general EN 50708-1-1:2020 apply.

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 subparts 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, 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.
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SIST EN 50708-3-1:2020
EN 50708-3-1:2020 (E)
1 Scope

The scope of this document is to define performance requirements of Large Power Transformers in compliance

with EN 50708-1-1:2020.

NOTE This document covers the transformers under Commission Regulation (EU) No 548/2014 of 21 May 2014 and

its amendment No 2019/1783 of 1 October 2019, 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.

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 50708-1-1:2020, Power transformers - Additional European requirements: Part 1-1: Common part - General

requirements
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 50708-1-1:2020 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Service condition

The additional requirements for service condition are given in EN 50708-1-1:2020.

5 Rating and general requirements
5.1 Energy performance requirements
5.1.1 General

For Large power transformers the energy performance requirement consist of a minimum value of Peak

Efficiency Index which is the maximum value of the Efficiency Index.

The Peak Efficiency Index is to be calculate in accordance with EN 50708-1-1:2020.

The tables in this clause indicate the minimum energy performances for TIER1 and TIER2.

TIER1 has been applied since 1 July 2015 for the values of losses following Commission Regulation (EU) No

548/2014 of 21 May 2014 and its amendment No 2019/1783 of 1 October 2019.

TIER2 shall be applied from 1 July 2021 for the values of losses following Commission Regulation (EU) No

548/2014 of 21 May 2014 and its amendment No 2019/1783 of 1 October 2019.
5.1.2 Minimum PEI values

Liquid immersed and dry type large power transformers shall have Minimum Peak Efficiency Index values

according to Table 1, Table 2 and Table 3 respectively.

For rated powers different from the ones reported in Table 1, Table 2 and Table 3, the corresponding PEI value

shall be obtained by linear interpolation from the two adjacent values.
The PEI requirements apply to transformers and auto-transformers.
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SIST EN 50708-3-1:2020
EN 50708-3-1:2020 (E)
For auto-transformers the reference power for PEI values is the rated power.
Three phase or single phase transformers shall be evaluated against t
...

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