IEC_TS_62446-3-2017.pdf

IEC TS 62446-3 Edition 1.0 2017-06 TECHNICA L SPECIFICA TION Photov oltaic(PV)systems Requirements for testing,documentation and maintenance Part 3:Photov oltaic modules and plants Outdoor infrared thermography IEC TS 62446-3:2017-06(en)colourinside THIS PUBLICA TION IS COPYRIGHT PROTECTED Copyright 2017 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no par t of this publication may be reproduced or utilized in any for m or by any means,electronic or mechanical,including photocopying and microfilm,without per mission in writing fr om either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional r ights to this publication,please contact the address below or your local IEC member National Committee for further infor mation.IEC Centr al Office Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 inf oiec.ch Switzerland www.iec.ch About t he IEC The International Electr otechnical Commission(IEC)is the leading global organization that prepar es and publishes Inter national Standards for all electr ical,electronic and related technologies.A bout IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sur e that you have the latest edition,a cor rigenda or an amendment might have been published.IEC Cat alogue-webstore.iec.ch/cat alogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards,Technical Specifications,Technical R eports and other documents.A v ailable for PC,Mac OS,A ndroid Tablets and iPad.IEC publications search-w w w.iec.ch/searchpub The adv anced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projec ts,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.A v ailable online and also once a month by email.Elect ropedia-w w w.elect ropedia.org The worlds leading online dic tionary of elec tronic and electrical terms containing 20 000 terms and definitions in English and French,with equiv alent terms in 16 additional languages.A lso known as the International Electrotechnical Vocabulary (IEV)online.IEC Glossar y-st d.iec.ch/glossary 65 000 elec trotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries hav e been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC Customer Service Cent re-webstore.iec.ch/csc If y ou wish to giv e us y our feedback on this publication or need further assistance,please contact the Customer Serv ice Centre:csciec.ch.IEC TS 62446-3 Edit ion 1.0 2017-06 TECHNICA L SPECIFICA TION Photov oltaic(PV)systems R equirements for testing,documentation and maintenance Part 3:Photov oltaic modules and plants Outdoor infrared thermography INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 27.160 ISBN 978-2-8322-4290-2 R egist er ed tr ademar k of t he Int er national Electr ot echnical Commission W arning!Make sure that y ou obtained this publication from an authorized distributor.colourinside 2 IEC TS 62446-3:2017 IEC 2017 CONTENTS FOREWORD.4 1 Scope.6 2 Normative references.6 3 Terms and definitions.7 4 Requirements of inspection equipment.9 4.1 General.9 4.2 Minimum requirements for IR-cameras used for inspecting PV plants.9 4.3 Requirements for photo cameras for documentation of the findings.10 4.4 Requirements for equipment to record the ambient conditions.10 5 Inspection procedure.11 5.1 General.11 5.2 Visual inspection.12 5.3 Environmental conditions.12 5.4 Imaging procedure.13 5.4.1 General.13 5.4.2 Using fast carriers for IR-camera,e.g.aerial drones.13 5.4.3 Emissivity.14 6 Software for evaluation.15 7 Evaluation.15 7.1 General.15 7.2 Evaluation of IR images.16 7.3 Thermal abnormalities.17 7.3.1 General.17 7.3.2 Classes of abnormalities(CoA).17 7.3.3 Abnormalities of PV modules.17 7.3.4 Abnormalities of other BOS components.17 7.4 Projection of temperature differences to nominal irradiance.18 7.4.1 General.18 7.4.2 Modules.20 7.4.3 Other BOS components.21 8 Inspection report.21 (normative)Inspection procedure explanations.24 Annex AA.1 Geometric resolution of the camera.24 A.2 Angle of view.24 A.3 Matrix for cell identification.25 (normative)Qualification of personnel.27 Annex B(normative)Matrix for thermal abnormalities of PV modules.28 Annex C(informative)Polygon measurement as a method of evaluation.32 Annex D(informative)Beaufort scale.34 Annex EBibliography.36 Figure 1 Impact of camera moving speed.14 Figure 2 Dependence of the emissivity of glass on the angle of view 10.15 Figure 3 Examples of influence of wind(left)and cloud movement(right)on observed temperature pattern.16 IEC TS 6