EN 62788-1-4-2016 en Measurement procedures for materials used in photovoltaic modules - Part 1-4 Encapsulants - Measurement of optical transmittance and calculation of the solar-w.pdf

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1、Measurement procedures for materials used in photovoltaic modulesPart 1-4: Encapsulants Measurement of optical transmittance and calculation of the solar-weighted photon transmittance, yellowness index, and UV cut-off wavelengthBS EN 62788-1-4:2016BSI Standards PublicationWB11885_BSI_StandardCovs_20

2、13_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation of EN 62788-1-4:2016. It isidentical to IEC 62788-1-4:2016. The UK participation in its preparation was entrusted to TechnicalCommittee GEL/82, Photovoltaic Energy Systems.A list of organizations represented

3、 on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2017. Published by BSI Standards Limited 2017ISBN 978 0 580 86400

4、 1ICS 27.160Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 6

5、2788-1-4:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 62788-1-4 December 2016 ICS 27.160 English Version Measurement procedures for materials used in photovoltaic modules - Part 1-4: Encapsulants - Measurement of optical transmittance and calculation of the solar-weighted photon transmit

6、tance, yellowness index, and UV cut-off wavelength (IEC 62788-1-4:2016) Procdures de mesure des matriaux utiliss dans les modules photovoltaques - Partie 1-4: Encapsulants - Mesurage du facteur de transmission optique et calcul du facteur de transmission photonique pondration solaire, de lindice de

7、jaunissement et de la frquence de coupure des UV (IEC 62788-1-4:2016) Messverfahren fr Werkstoffe, die in Photovoltaikmodulen verwendet werden - Teil 1-4: Verkapselungsstoffe - Messung der optischen Transmission und Berechnung der solargewichteten Photonentransmission, des Vergilbungsindex und der U

8、V-Grenzfrequenz (IEC 62788-1-4:2016) This European Standard was approved by CENELEC on 2016-11-01. 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.

9、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

10、 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 Repub

11、lic, 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. E

12、uropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CENELEC All rights of exploitation in any form and by any means reserved world

13、wide for CENELEC Members. Ref. No. EN 62788-1-4:2016 E BS EN 62788-1-4:2016EN 62788-1-4:2016 2 European foreword The text of document 82/1148/FDIS, future edition 1 of IEC 62788-1-4, prepared by IEC/TC 82 “Solar photovoltaic energy systems“ was submitted to the IEC-CENELEC parallel vote and approved

14、 by CENELEC as EN 62788-1-4:2016. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2017-08-01 latest date by which the national standards conflicting with the document hav

15、e to be withdrawn (dow) 2019-11-01 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. Endorsement notice The text of the International St

16、andard IEC 62788-1-4:2016 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated : IEC/TS 61836 NOTE Harmonized as CLC/TS 61836. BS EN 62788-1-4:2016EN 62788-1-4:2016 3 Annex ZA

17、 (normative) Normative references to international publications with their corresponding European publications 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. Fo

18、r undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the Euro

19、pean Standards listed in this annex is available here: www.cenelec.eu Publication Year Title EN/HD Year IEC 60904-3 - Photovoltaic devices - Part 3: Measurement principles for terrestrial photovoltaic (PV) solar devices with reference spectral irradiance data EN 60904-3 - ISO 291 2008 Plastics - Sta

20、ndard atmospheres for conditioning and testing EN ISO 291 2008 ISO 11664-1 2007 Colorimetry - Part 1: CIE standard colorimetric observers EN ISO 11664-1 2011 ISO 11664-2 2007 Colorimetry - Part 2: CIE standard illuminants EN ISO 11664-2 2011 ISO 13468-2 1999 Plastics - Determination of the total lum

21、inous transmittance of transparent materials - Part 2: Double-beam instrument EN ISO 13468-2 2006 ISO 17223 2014 Plastics - Determination of yellowness index and change in yellowness index - - ASTM E424-71 2007 1)Standard test methods for solar energy transmittance and reflectance (Terrestrial) of s

22、heet materials - - 1)Superseded by ASTM E424-71:2015. BS EN 62788-1-4:2016 2 IEC 62788-1-4:2016 IEC 2016 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references. 5 3 Terms and definitions 6 4 Principle 7 5 Apparatus 7 6 Test specimens . 7 6.1 Nominal (and unweathered) transmittance to the cell . 7 6.

23、2 Weathering studies . 8 6.3 Glass for superstrates/substrates 9 6.4 Number of specimens 9 6.5 Preconditioning of specimens 9 7 Measurement procedure 9 7.1 General . 9 7.2 Specimen preparation . 9 7.3 Instrument calibration (baseline measurements) 9 7.4 Specimen measurements 10 7.5 Witness measureme

24、nts . 10 8 Calculation and expression of results . 10 8.1 Post-processing of data . 10 8.2 Calculation of weighted transmittance 10 8.3 Calculation of the Yellowness Index (YI) 11 8.4 Calculation of the UV cut-off wavelength 11 9 Uncertainty of measurements . 11 10 Test report. 12 Annex A (informati

25、ve) Advanced analysis of transmittance (absorption coefficients) 14 Annex B (informative) Applying the quantum efficiency of a specific cell technology 16 Bibliography . 18 Table 1 Details of the solar weight transmittance parameters 11 BS EN 62788-1-4:2016IEC 62788-1-4:2016 IEC 2016 3 INTERNATIONAL

26、 ELECTROTECHNICAL COMMISSION _ MEASUREMENT PROCEDURES FOR MATERIALS USED IN PHOTOVOLTAIC MODULES Part 1-4: Encapsulants Measurement of optical transmittance and calculation of the solar-weighted photon transmittance, yellowness index, and UV cut-off wavelength FOREWORD 1) The International Electrote

27、chnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To t

28、his end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC Nationa

29、l Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO)

30、 in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation fro

31、m all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be he

32、ld responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any d

33、ivergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to I

34、EC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual

35、experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this I

36、EC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this I

37、EC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62788-1-4 has been prepared by IEC technical committee 82: Solar photovoltaic energy systems. The text of this standard is based on the foll

38、owing documents: FDIS Report on voting 82/1148/FDIS 82/1165/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. BS EN 62788-1-4:2016 4 IEC 62788-1-4:2016 IEC 2016 A list of all parts in the IEC 62788 series, publishe

39、d under the general title Measurement procedures for materials used in photovoltaic modules, can be found on the IEC website. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged unt

40、il the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS EN 62788-1-4:2016IEC 62788-1-4:2016 IEC 2016 5 MEASUREMENT PRO

41、CEDURES FOR MATERIALS USED IN PHOTOVOLTAIC MODULES Part 1-4: Encapsulants Measurement of optical transmittance and calculation of the solar-weighted photon transmittance, yellowness index, and UV cut-off wavelength 1 Scope This part of IEC 62788 provides a method for measurement of the optical trans

42、mittance of encapsulation materials used in photovoltaic (PV) modules. The standardized measurements in this procedure quantify the expected transmittance of the encapsulation to the PV cell. Subsequent calculation of solar-weighted transmittance allows for comparison between different materials. Th

43、e results for unweathered material may be used in an encapsulation manufacturers datasheets, in manufacturers material or process development, in manufacturing quality control (material acceptance), or applied in the analysis of module performance. This measurement method can also be used to monitor

44、 the performance of encapsulation materials after weathering, to help assess their durability. The standardized measurements are intended to examine an interior region within a PV module, e.g., without the effects of oxygen diffusion around the edges of the cells. Subsequent calculation of yellownes

45、s index allows for quantification of durability and consideration of appearance. The change in transmittance, yellowness index, and ultraviolet (UV) cut-off wavelength may be used by encapsulation or module manufacturers to compare the durability of different materials. 2 Normative references The fo

46、llowing 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. IEC

47、 60904-3, Photovoltaic devices Part 3: Measurement principles for terrestrial photovoltaic (PV) solar devices with reference spectral irradiance data ISO 291:2008, Plastics Standard atmospheres for conditioning and testing ISO 11664-1:2007, Colorimetry Part 1: CIE standard colorimetric observers ISO

48、 11664-2:2007, Colorimetry Part 2: CIE standard illuminants ISO 13468-2:1999, Plastics Determination of the total luminous transmittance of transparent materials Part 2: Double-beam instrument ISO 17223:2014, Plastics Determination of yellowness index and change in yellowness index ASTM E424-71:2007

49、, Standard test methods for solar energy transmittance and reflectance (Terrestrial) of sheet material BS EN 62788-1-4:2016 6 IEC 62788-1-4:2016 IEC 2016 3 Terms and definitions For the purposes of this document, the following terms and definitions 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/o