1、BSI Standards Publication Photovoltaic (PV) modules Cyclic (dynamic) mechanical load testing PD IEC/TS 62782:2016National foreword This Published Document is the UK implementation of IEC/TS 62782:2016. The UK participation in its preparation was entrusted to Technical Committee GEL/82, Photovoltaic
2、Energy Systems. 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 2016. Publi
3、shed by BSI Standards Limited 2016 ISBN 978 0 580 82386 2 ICS 27.160 Compliance with a British Standard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 March 2016. Amendments/corrigenda issu
4、ed since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TS 62782:2016 IEC TS 62782 Edition 1.0 2016-03 TECHNICAL SPECIFICATION Photovoltaic (PV) modules Cyclic (dynamic) mechanical load testing INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 27.160 ISBN 978-2-8322-3223-1 Registered trademark
5、 of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. PD IEC/TS 62782:2016 2 IEC TS 62782:2016 IEC 2016 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references. 5 3 Terms and definitions 6 4 Apparatus 6 5 Initial measur
6、ements 6 6 Procedure . 7 7 Final measurements 7 8 Test report. 8 Annex A (informative) Subsequent testing 9 PD IEC/TS 62782:2016IEC TS 62782:2016 IEC 2016 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ PHOTOVOLTAIC (PV) MODULES CYCLIC (DYNAMIC) MECHANICAL LOAD TESTING FOREWORD 1) The International El
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19、 on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International Standards. IEC TS 62782, which is a technical specification, has been prepared by IEC technical committee 82: Solar photovoltai
20、c energy systems. PD IEC/TS 62782:2016 4 IEC TS 62782:2016 IEC 2016 The text of this technical specification is based on the following documents: Enquiry draft Report on voting 82/971/DTS 82/1014A/RVC Full information on the voting for the approval of this technical specification can be found in the
21、 report on voting indicated in the above table. 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 until the stability date indicated on the IEC website under “http:/webstore.iec.c
22、h“ in the data related to the specific publication. At this date, the publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. PD IEC/TS 62782:2016IEC TS 6
23、2782:2016 IEC 2016 5 PHOTOVOLTAIC (PV) MODULES CYCLIC (DYNAMIC) MECHANICAL LOAD TESTING 1 Scope This technical specification provides a test method for performing a cyclic (dynamic) mechanical load test in which the module is supported at the design support points and a uniform load normal to the mo
24、dule surface is cycled in alternating negative and positive directions. This test may be utilized to evaluate if components within the module including solar cells, interconnect ribbons and/or electrical bonds within the module are susceptible to breakage or if edge seals are likely to fail due to t
25、he mechanical stresses encountered during installation and operation. This test can be performed at any module temperature within the normal operating temperature range. Since the results have been determined to depend on the module temperature during the application of the load it is critical to ma
26、intain the module at a constant temperature during the performance of this test. This technical specification has historically been applied to rigid modules. It cannot be applied to flexible modules unless they are designed to be mounted in a rigid manner. In which case, the cyclic (dynamic) mechani
27、cal load test can be applied to the flexible module in its rigid mounting system. This test has been written as a standalone technical specification, but it is likely to be used in conjunction with other test standards. Typically, this test itself will not result in power loss, but when followed by
28、additional stress tests like thermal cycling and humidity freeze, the damage done by the mechanical cycling results in power loss that would not have occurred due only to the thermal cycling and humidity freeze tests. For example, the transportation testing procedure (IEC 62759) includes the require
29、ments for such a cyclic (dynamic) mechanical load test followed by 50 thermal cycles and 10 humidity freeze cycles. 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 t
30、he edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC TS 60904-12, Photovoltaic devices Part 12: Infrared thermography of photovoltaic modules 1IEC TS 60904-13, Photovoltaic devices Part 13: Electroluminescence of phot
31、ovoltaic modules 1 IEC 61215-1:2016, Terrestrial photovoltaic (PV) modules Design qualification and type approval Part 1: Test requirements IEC 61215-2:2016, Terrestrial photovoltaic (PV) modules Design qualification and type approval Part 2: Test procedures IEC TS 61836, Solar photovoltaic energy s
32、ystems Terms, definitions and symbols _ 1To be published. PD IEC/TS 62782:2016 6 IEC TS 62782:2016 IEC 2016 ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC
33、 TS 61836 apply. 4 Apparatus The apparatus for this technical specification include: a) Equipment for performing the cyclic (dynamic) loading: this equipment shall be capable of applying a uniform load of 1 000 Pa 100 Paonto the module surface in both directions to simulate pressure and tensile load
34、s at a rate between 3 and 7 cycles per minute. The prescribed load is of uniform pressure, P, and is most appropriately applied with a pressure of air or vacuum. If a piston system (or other non-uniform application) is used to load the module, the force each piston (or applicators) exert is F = PA/n
35、, where A is the area of the module and n is the number of pistons. To ensure a similar effect to the module, the maximum, perpendicular, center-to-center distance between evenly loaded points shall be 20 cm or less. If one piston consists of multiple loading points this maximum distance refers to b
36、oth the loading points within and between pistons. The maximum perpendicular distance between the module frame and an evenly loaded point shall also be 20 cm or less. b) Means for monitoring, throughout the test, the continuity of the internal circuit of each module. c) Means for monitoring the temp
37、erature of the module to an accuracy of 2,0 C and repeatability of 0,5 C. The temperature sensors shall be attached to the front or back surface of the module near the middle without interfering with the cyclic loading. d) Infrared (IR) camera and a constant current power supply capable of providing
38、 between one and two times the Standard Test Condition (STC) maximum power current of the module in the forward direction. (See future IEC TS 60904-12.) e) Electroluminescence (EL) equipment and a constant current power supply capable of providing between 0,1 and 1 times the STC short circuit curren
39、t of the module in the forward direction. (See future IEC TS 60904-13.) The IR and EL systems do not have to be capable of observing the module while it is under test. These tests can be performed independent of the cyclic (dynamic) load test equipment. 5 Initial measurements The following measureme
40、nts shall be performed on the test module before beginning the stress testing. a) Perform a visual inspection of the module in accordance with IEC 61215-2 MQT 01. b) Perform the initial module stabilization procedure in accordance with IEC 61215-2 MQT 19.1. c) Measure the maximum power performance o
41、f the module in accordance with IEC 61215-2 MQT 02. d) Perform an insulation test in accordance with IEC 61215-2 MQT 03. e) Perform a wet leakage current test in accordance with IEC 61215-2 MQT 15. f) Perform an EL scan of the module using a forward bias current between 0,1 and one times the STC sho
42、rt circuit current to identify cracked cells and other breaks in the cell junction. Note the observed broken cells, interconnects and/or electrical bonds or any additional anomalies observed in the test report (Clause 8k) as identified in future IEC TS 60904-13. PD IEC/TS 62782:2016IEC TS 62782:2016
43、 IEC 2016 7 g) Perform an IR scan of the module using a forward bias current between the STC maximum power current and twice the STC maximum power current to identify areas of localized heating. Note the observed areas of localized heating in the test report (Clause 8k) as identified in future IEC T
44、S 60904-12. If there is reason to use a current of more than Isc in either the IR or EL test, check with the module manufacturer to determine that such a high current will not damage the module. 6 Procedure a) Equip the module so that the electrical continuity of the internal circuit can be monitore
45、d continuously during the test. b) Mount the module on the cyclic (dynamic) loading equipment using the method prescribed by the manufacturer including the mounting means (clips/clamps and any kind of fastener) and underlying support rails. If there are different possibilities each mounting method n
46、eeds to be evaluated separately. For all mounting methods, mount the module in a manner where the distance between the fixing points is worst case, which is typically at the maximum distance. c) Set the module temperature at the desired level. Monitor the module temperature throughout the applicatio
47、n of the cyclic loading. Maintain module temperature within 2 C of the selected temperature during the application of the cyclic loading. d) Apply the cyclic (dynamic) mechanical load and cycle it 1 000 times using a maximum pressure of 1 000 Pa (with a tolerance of 100 Pa)and a rate between 3 and 7
48、 cycles per minute. (Cycles being defined as one positive and one negative load application.) e) Monitor continuity throughout the test. Measuring continuity requires only a small current flow (1% of Isc would be more than adequate). However, there may be cases where it would be useful or interestin
49、g for the test to be performed with a higher current flow, up to the STC peak power current. If that is the case this fact should be noted in the test report (Clause 8 j). Such a test could end up causing arcing in broken cells or broken interconnects. Cyclic (dynamic) mechanical load tests are normally performed in the laboratory at room temperature. However, there may be cases where it is of interest to perform the test at either lower temperatures to simulate stress during win
