EN 50629:2015
(Main)Energy performance of large power transformers (Um > 36 kV or Sr ≥ 40 MVA)
Energy performance of large power transformers (Um > 36 kV or Sr ≥ 40 MVA)
This European Standard applies 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. The scope of this European Standard is the following: - Defining the appropriate energy efficiency criteria; - Setting of benchmark minimum efficiency levels for new transformers based on an assessment of the energy efficiency of the European transformer population installed in the last 10 years; - Proposing higher minimum efficiency levels for improving the energy efficiency of new transformers; - Providing guidance for consideration of Total Cost of Ownership. This European Standard provides also a form for efficiency data collection to inform future efficiency benchmark levels. NOTE 1 This standard covers the transformers under the EU Regulation N. 548/2014 and gives additional specific indications for single phase transformers, auto transformers, multi winding transformers and for transformers with OD and OF cooling systems. Transformers considered to be out of the scope of this document are the following: - instrument transformers, specifically designed to supply measuring instruments, meters, relays and other similar apparatus, - transformers with low-voltage windings specifically designed for use with rectifiers to provide a DC supply, - transformers specifically designed to be directly connected to a furnace, - transformers specifically designed for offshore applications and floating offshore applications, - transformers specially designed for emergency installations, - transformers and auto-transformers specifically designed for railway feeding systems, - earthing or grounding transformers, this is, three-phase transformers intended to provide a neutral point for system grounding purposes, - traction transformers mounted on rolling stock, this is, transformers connected to an AC or DC contact line, directly or through a converter, used in fixed installations of railway applications, - starting transformers, specifically designed for starting three-phase induction motors so as to eliminate supply voltage dips, - testing transformers, specifically designed to be used in a circuit to produce a specific voltage or current for the purpose of testing electrical equipment, - welding transformers, specifically designed for use in arc welding equipment or resistance welding equipment, - transformers specifically designed for explosion-proof and underground mining applications, - transformers specifically designed for deep water (submerged) applications, - medium Voltage (MV) to Medium Voltage (MV) interface transformers up to 5 MVA, - large power transformers where it is demonstrated that for a particular application, technically feasible alternatives are not available to meet the minimum efficiency requirements set out by EU REGULATION N. 548/2014, - large power transformers which are like for like replacements in the same physical location/installation for existing large power transformers, where this replacement cannot be achieved without entailing disproportionate costs associated to their transportation and/or installation. For dry type large power transformers Minimum PEI values have been published in European Regulation and these values are included in Annex A. NOTE 2 To retain consistency, the same list of exclusions in the EU Regulation N. 548/2014, has also been reproduced here. Within the above EU exclusion list, some had been excluded simply because no PEI data was available to CENELEC at the time on which to base appropriate PEI levels. Consequently, as such information becomes available in the future, it may be possible to derive suitable PEI Levels. Accordingly these particular categories are listed in Clause 6 as suitable for future consideration.
Energiekennwerte von Großleistungstransformatoren (Um > 36 kV oder Sr ≥ 40 MVA)
Performance énergétique des transformateurs de grande puissance (Um > 36 kV ou Sr ≥ 40 MVA)
Energijski izkoristek velikih transformatorjev (Um > 36 kV ali Sr ≥ 40 MVA)
Ta evropski standard velja za nove trifazne in enofazne transformatorje z Um > 36 kV.
Obseg tega evropskega standarda je naslednji:
• opredelitev primernih kriterijev za energetsko učinkovitost;
• določitev minimalnih ravni učinkovitosti, ki služijo kot merilo za nove transformatorje, na podlagi ocene energijske učinkovitosti transformatorjev, nameščenih v Evropi v obdobju zadnjih 10 let;
• predlaganje višjih minimalnih ravni učinkovitosti za izboljšanje energijske učinkovitosti novih transformatorjev;
• podajanje smernic za oceno skupnih stroškov posedovanja.
Ta evropski standard podaja tudi obliko za zbiranje podatkov o učinkovitosti za oblikovanje prihodnjih ravni meril učinkovitosti.
Transformatorji, ki ne spadajo v področje uporabe tega dokumenta, so naslednji:
• instrumentni transformatorji;
• ozemljitveni transformatorji;
• transformatorji vleke, nameščeni na železniška vozila;
• zagonski transformatorji;
• preskusni transformatorji;
• varilni transformatorji;
• transformatorji, izdelani za protieksplozijsko uporabo ali za uporabo v podzemnem rudarstvu;
• transformatorji, izdelani za uporabo v globoki vodi (podvodna uporaba).
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2015
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(QHUJ\SHUIRUPDQFHRIODUJHSRZHUWUDQVIRUPHUV 8P!N9RU6U•09$
(QHUJLHNHQQZHUWHYRQ*UR‰OHLVWXQJVWUDQVIRUPDWRUHQ 8P!N9RGHU6U•09$
3HUIRUPDQFHpQHUJpWLTXHGHVWUDQVIRUPDWHXUVGHJUDQGHSXLVVDQFH 8P!N9RX6U•
09$
Ta slovenski standard je istoveten z: EN 50629:2015
ICS:
27.015 (QHUJLMVNDXþLQNRYLWRVW Energy efficiency. Energy
2KUDQMDQMHHQHUJLMHQD conservation in general
VSORãQR
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50629
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2015
ICS 29.180
English Version
Energy performance of large power transformers (Um > 36 kV or
Sr ≥ 40 MVA)
Performance énergétique des transformateurs de grande Energiekennwerte von Großleistungstransformatoren (Um >
puissance (Um > 36 kV ou Sr ≥ 40 MVA) 36 kV oder Sr ≥ 40 MVA)
This European Standard was approved by CENELEC on 2015-06-25. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50629:2015 E
Contents Page
Foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
4 Efficiency and Efficiency Index calculation . 8
4.1 General . 8
4.2 Efficiency Index general formula . 8
4.3 Peak Efficiency Index . 9
5 Minimum Peak Efficiency Index values . 10
5.1 Standardised values of Minimum PEI . 10
5.2 Optimization of transformer losses according to application . 12
5.3 Rating plate data . 12
5.4 Transformer asset data . 12
5.5 Tolerances, measurement uncertainties and market surveillance. 12
5.5.1 Factory acceptance . 12
5.5.2 Verification procedure for market surveillance . 13
6 Transformers categories currently excluded . 13
7 Capitalisation of losses . 14
Annex A (normative) Minimum PEI for dry type large power transformers . 15
Annex B (informative) Peak Efficiency Index formula, graphs and calculations . 16
B.1 Calculation of k . 16
PEI
B.2 Graph of Efficiency Index and load factor with loss contributions . 17
B.3 Graphs of prescribed PEI values and rated power . 18
B.4 Independence of PEI to rated power. 19
B.5 Calculation of losses from PEI, k and S . 20
PEI r
Annex C (informative) Form for data requested . 21
C.1 Example of form for data requested . 21
C.2 Indications for filling the table . 22
Annex D (informative) Benchmark of Peak Efficiency Index . 23
D.1 General . 23
D.2 Benchmark figures . 23
D.3 Variations from the benchmark . 28
D.3.1 General . 28
D.3.2 Autotransformers. 28
D.3.3 Voltage and insulation level . 28
D.3.4 More than two windings . 28
D.3.5 Short-circuit impedance . 28
D.3.6 Tapping range . 29
D.3.7 Losses on taps different that rated tap . 29
D.3.8 Separate phases . 30
D.4 Exceptions from benchmark . 30
D.4.1 General . 30
D.4.2 Transformers with unusual combinations of windings and voltages . 30
D.4.3 Installation restrictions . 30
D.4.4 Offshore installation . 30
D.4.5 Transportation restrictions . 30
D.4.6 Transformers for temporary installation . 30
D.4.7 Converter transformers . 30
D.4.8 Dry-type and gas insulated transformers . 30
D.4.9 Other exemptions . 31
Annex E (informative) Capitalisation of losses . 32
E.1 General Theory, Concept of Capitalisation. 32
E.2 Impact of capitalisation values . 32
E.3 Capitalisation formula . 33
E.3.1 General . 33
E.3.2 Calculation of factor A . 34
E.3.3 Calculation of factor B . 35
E.3.4 Use of A and B for tender evaluation . 37
E.3.5 Determination of factors A and B . 37
Annex F (informative) Background on verification tolerances during market surveillance . 39
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 . 40
Bibliography . 41
Foreword
This document (EN 50629:2015) has been prepared by CLC/TC 14, "Power transformers".
The following dates are fixed:
- latest date by which this document has (dop) 2016-06-25
to be implemented at national level by
publication of an identical national
standard or by endorsement
- latest date by which the national (dow) 2018-06-25
standards 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 [and/or CEN] 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.
Introduction
This European Standard has been prepared at the request of the European Commission under the mandate
EC 24/2011 and applies to large power transformers covered by the COMMISSION REGULATION (EU) N.
548/2014 of 21 May 2014.
For large power transformers (LPT) the strict definition of efficiency based on transmitted and absorbed active
power alone is not useful for evaluating the energy performance because the losses are either fixed (no load
loss), or depend on current (load loss) and therefore conventional efficiency would be zero if only reactive
power is transmitted (reactive power transmission is very important for network operation). The conventional
calculation of efficiency is therefore not helpful for comparing transformer designs which may be used over a
range of operating conditions.
In general for LPT it is not possible to give optimal values for load and no load losses for a particular rated
power because of the variety of applications which affect the energy performance.
In order to define an index that is specific to the transformer design, but applicable to a wide range of uses,
rather than a figure that varies from second to second depending on system conditions, it is essential to
characterize the energy performance of power transformers. For th
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