1、BSI Standards PublicationBS EN 50629:2015Energy performance of large power transformers (Um 36 kV or Sr 40 MVA)BS EN 50629:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50629:2015. The UK participation in its preparation was entrusted to TechnicalCommitte
2、e PEL/14, Power transformers.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution
3、 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 85075 2 ICS 29.180 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2015.Amendments/corrigenda
4、 issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 50629 June 2015 ICS 29.180 English Version Energy performance of large power transformers (Um 36 kV orSr 40 MVA) Performance nergtique des transformateurs de grande puissance (Um 36 kV ou Sr 40 MVA
5、) Energiekennwerte von Groleistungstransformatoren (Um 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 na
6、tional 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).
7、 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, Bul
8、garia, 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, Switzer
9、land, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation ElectrotechniqueEuropisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any
10、 form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50629:2015 E BS EN 50629:2015EN 50629:2015 (E) 2 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
11、 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, measur
12、ement 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 (infor
13、mative) Peak Efficiency Index formula, graphs and calculations . 16 B.1 Calculation of kPEI. 16 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 fro
14、m PEI, kPEIand Sr20 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
15、 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 Gener
16、al . 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 BS EN 50629:2015EN 50629:2015 (E) 3 D.4.5 Transportation restrictions 30 D.4.6 Transformers for temporary installation . 30 D.4.7 Converter transform
17、ers 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 facto
18、r 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 requi
19、rements 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 BS EN 50629:2015EN 50629:2015 (E) 4 Foreword This document (EN 50629:2015)
20、 has been prepared by CLC/TC 14, “Power transformers“. The following dates are fixed: - latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-06-25 - latest date by which the national standards conflic
21、ting with this document have to be withdrawn (dow) 2018-06-25 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 p
22、repared 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 docum
23、ent. BS EN 50629:2015EN 50629:2015 (E) 5 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 transfor
24、mers (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 rea
25、ctive 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 giv
26、e 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
27、second to second depending on system conditions, it is essential to characterize the energy performance of power transformers. For this reason a metric Peak Efficiency Index (PEI) has been developed which is based on real power losses and total power transmitted and is independent of load phase angl
28、e, load factor and rated power. This document provides a standard method for evaluating the energy performance of power transformers through the use of the Peak Efficiency Index, gives benchmark figures for PEI and the reasons why certain transformers may have efficiencies which are higher or lower
29、than the benchmark. Setting a reasonable value of minimum Peak Efficiency Index will be effective in improving the overall efficiency of the installed transformer population by eliminating transformers with poor efficiency, with the exception of some transformers subject to specific limitations. The
30、 use of a minimum value of Peak Efficiency Index sets a floor for transformer efficiency performance, but the use of proper loss capitalisation for purchasing transformers is essential to select a transformer with the optimal economically justified level of efficiency. Users not using loss capitalis
31、ation are strongly encouraged to investigate the benefits of doing so. For large units above 100 MVA the economically achievable efficiency of a transformer may be limited by the technical parameters of the network (e.g. impedance), and specific transport and installation constraints. As the units c
32、oncerned are usually purchased by large transmission system owners, who typically use high values of loss capitalization, those units above 100 MVA already tend to be state of the art as far as efficiency is concerned. For transformers with unusual configurations and/or very severe size or weight li
33、mitations it may be unreasonable to meet the minimum efficiency requirement for either technical or economic reasons. In these cases it will be acceptable to demonstrate that the highest reasonable level of efficiency has been achieved (see Clause 6). It is considered that the approach to energy per
34、formance set out in this document could also be applicable in principle to transformers outside the scope of this standard. BS EN 50629:2015EN 50629:2015 (E) 6 1 Scope This European Standard applies to new three-phase and single-phase power transformers with a highest voltage for equipment exceeding
35、 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
36、 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 Co
37、st 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 guidance for single phase transformers, autotransfo
38、rmers, 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. Transformers considered to be out of the scope of this document are the following: - instrument transfor
39、mers, 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, - transf
40、ormers 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
41、 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 transformer
42、s, 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, specifica
43、lly 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) inte
44、rface 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 l
45、ike 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
46、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 availab
47、le 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. BS EN 50629:201
48、5EN 50629:2015 (E) 7 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document
49、 (including any amendments) applies. EN 60076 (all parts), Power transformers (IEC 60076, all parts) 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/TS 60076-19) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 60076-1:2011 and the following apply. 3.1 Large Power Transformer LPT power transformer with a highest voltage for equipment exceeding 36 kV and a rated power equal or higher than 5 kVA, or a rated po
