ASTM E1830-2015 Standard Test Methods for Determining Mechanical Integrity of Photovoltaic Modules 《测定光电模组机械一体性的标准试验方法》.pdf

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1、Designation: E1830 15Standard Test Methods forDetermining Mechanical Integrity of Photovoltaic Modules1This standard is issued under the fixed designation E1830; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi

2、sion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 These test methods cover procedures for determiningthe ability of photovoltaic modules to withstand the mechanicalloads, stress

3、es and deflections used to simulate, on an acceler-ated basis, high wind conditions, heavy snow and iceaccumulation, and non-planar installation effects.1.1.1 A static load test to 2400 Pa is used to simulate windloads on both module surfaces.1.1.2 A static load test to 5400 Pa is used to simulate h

4、eavysnow and ice accumulation on the module front surface.1.1.3 A twist test is used to simulate the non-planar mount-ing of a photovoltaic module by subjecting it to a twist angleof 1.2.1.1.4 A cyclic load test of 10 000 cycles duration and peakloading to 1440 Pa is used to simulate dynamic wind or

5、 otherflexural loading. Such loading might occur during shipment orafter installation at a particular location.1.2 These test methods define photovoltaic test specimensand mounting methods, and specify parameters that must berecorded and reported.1.3 Any individual mechanical test may be performedsi

6、ngly, or may be combined into a test sequence with othermechanical or nonmechanical tests, or both. Certain precondi-tioning test methods such as annealing or light soaking mayalso be necessary or desirable as a part of such a sequence.However, the determination of such test sequencing andpreconditi

7、oning is beyond the scope of these test methods.1.4 These test methods do not establish pass or fail levels.The determination of acceptable or unacceptable results isbeyond the scope of these test methods.1.5 These test methods do not apply to concentrator mod-ules.1.6 The values stated in SI units

8、are to be regarded asstandard. No other units of measurement are included in thisstandard.1.7 The following precautionary caveat pertains only to thehazards portion, Section 6, and the warning statements, 7.5.3.2and 7.6.3.2, of these test methods. This standard does notpurport to address all of the

9、safety concerns, if any, associatedwith its use. It is the responsibility of the user of this standardto establish appropriate safety and health practices anddetermine the applicability of regulatory limitations prior touse.2. Referenced Documents2.1 ASTM Standards:2E772 Terminology of Solar Energy

10、ConversionE1036 Test Methods for Electrical Performance of Noncon-centrator Terrestrial Photovoltaic Modules and ArraysUsing Reference CellsE1462 Test Methods for Insulation Integrity and GroundPath Continuity of Photovoltaic ModulesE1799 Practice for Visual Inspections of Photovoltaic Mod-ules3. Te

11、rminology3.1 DefinitionsDefinitions of terms used in these testmethods may be found in Terminology E772.4. Significance and Use4.1 The useful life of photovoltaic modules may depend ontheir ability to withstand periodic exposure to high wind forces,cyclic loads induced by specific site conditions or

12、 shipmentmethods, high loads caused by accumulated snow and ice onthe module surface, and twisting deflections caused by mount-ing to non-planar surfaces or structures. The effects on themodule may be physical or electrical, or both. Mostimportantly, the effects may compromise the safety of themodul

13、e, particularly in high voltage applications, or where thepublic may be exposed to broken glass or other debris.4.2 These test methods describe procedures for mountingthe test specimen, conducting the prescribed mechanical tests,and reporting the effects of the testing.1These test methods are under

14、the jurisdiction of ASTM Committee E44 onSolar, Geothermal and Other Alternative Energy Sources and are the directresponsibility of Subcommittee E44.09 on Photovoltaic Electric Power Conversion.Current edition approved Feb. 1, 2015. Published March 2015. Originallyapproved in 1996. Last previous edi

15、tion approved in 2009 as E1830 - 04. DOI:10.1520/E1830-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandardsvolume information, refer to the standards Document Summary page onthe ASTM website.Copy

16、right ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.2.1 The mounting and fastening method shall comply withthe manufacturers recommendations as closely as possible. Ifslots or multiple mounting holes are provided on the moduleframe for opti

17、onal mounting point capability, the worst-casemounting positions shall be selected in order to subject themodule to the maximum stresses.4.2.2 If an unframed module is being tested, the moduleshall be mounted in strict accordance with the manufacturersinstructions using the recommended attachment cl

18、ips, brackets,fasteners or other hardware, and tightened to the specifiedtorque.4.2.3 The test specimen is mounted on a test base in a planarmanner (unless specified otherwise), simulating a field mount-ing arrangement in order to ensure that modules are tested in aconfiguration that is representati

19、ve of their use in the field.4.2.4 During the twist test, the module is mounted in amanner simulating a non-planar field mounting where one ofthe fastening points is displaced to create an intentional twist of1.2.4.3 Data obtained during testing may be used to evaluateand compare the effects of the

20、simulated environments on thetest specimens. These test methods require analysis of bothvisible effects and electrical performance effects.4.3.1 Effects on modules may vary from no changes tosignificant changes. Some physical changes in the module maybe visible even though there are no apparent elec

21、trical perfor-mance changes. Conversely, electrical performance changesmay occur with no visible change in the module.4.3.2 All conditions of measurement, effects of the testexposure, and any deviations from these test methods must bedescribed in the report so that an assessment of their signifi-can

22、ce can be made.4.4 If these test methods are being performed as part of acombined sequence with other mechanical or nonmechanicaltests, the results of the final electrical test (7.2) and visualinspection (7.3) from one test may be used as the initialelectrical test and visual inspection for the next

23、 test; duplica-tion of these tests is unnecessary unless so specified.4.5 Some module designs may not use any external metalliccomponents and thus lack a ground point designation by themodule manufacturer. In these cases, the ground path continu-ity test is not applicable.5. Apparatus5.1 In addition

24、 to the apparatus required for Test MethodsE1036 and E1462, the following apparatus is required.5.2 Open Circuit Fault DetectionInstrumentation formonitoring the module under test for open circuit conditionsduring the mechanical integrity tests. An acceptable apparatusis described in Annex A1.5.3 St

25、atic Load Test Apparatus:5.3.1 Test BaseA rigid test base shall be provided thatenables the module to be mounted front-side up or front-sidedown in accordance with the requirements of 4.2.1 4.2.3. Thetest base shall enable the module to deflect freely during loadapplication to preclude any inadverte

26、nt interference or limitingof the normal deflections.5.3.2 Load Measurement EquipmentMeans shall be pro-vided for measuring the applied load to within the prescribedtolerances.5.3.3 LoadsSuitable masses or means of applying pres-sure shall be provided that enable the load to be applied in agradual,

27、uniform manner. Some examples of loads that can beused are:5.3.3.1 Stacks of paper or small canvas or plastic bags filledwith several kilograms of sand, loose stones, or lead shot in asufficient quantity to meet the total load requirement,5.3.3.2 A water bag that can be progressively filled toincrea

28、se the load,5.3.3.3 A pneumatic bag that can be inflated to a controlledpressure and that is located between the module and a fixedsurface (see 5.5, Cyclic Load Test Apparatus),5.3.3.4 Loose sand can be used provided that a perimeterretaining skirt of cardboard or thin plywood, for example, isemploy

29、ed around the module perimeter to retain the sand andmaintain load uniformity to the module edges, or5.3.3.5 Bricks or cement blocks may be used, but a padshould first be placed on the module to prevent scratch orparticle damage. With such rigid load elements, care should beexercised to minimize loa

30、d concentration points.5.3.3.6 If the applied load is comprised of discrete loadelements such as bags, bricks, or blocks, the individual unitsshall weigh within 5 % of one another to ensure the applicationof a uniform load on the module.5.3.3.7 The applied load may be measured by pre-weighingthe loa

31、d elements, or the load may be measured in situ duringthe test by the use of load scales incorporated into the testapparatus. If a pneumatic bag is used, the load can be measuredwith a pressure gage because the load is provided by pneumaticpressure.5.4 Twist Test Apparatus:5.4.1 A rigid test fixture

32、 shall be provided that allows themodule to be installed in a flat, planar configuration, and thatpermits the displacement of one of the attachment points suchthat a twist is induced in the module (see Fig. 1). The testfixture must meet the requirements of 4.2.1 4.2.4.5.4.2 Acceptable test fixtures

33、capable of meeting this re-quirement include a simple table and shim arrangement, or amore complicated rack structure with a special screw adjust-ment for imposing the twist-inducing displacement.5.5 Cyclic Load Test ApparatusSeveral schemes are avail-able for conducting the cyclic load test. Whiche

34、ver scheme isselected must adhere to the requirements of 4.2.1 4.2.3.Schemes that have been found acceptable are:5.5.1 Air Bag SchemeWith this scheme, pressure is ap-plied by inflatable air bags. The module is sandwiched betweentwo inflatable air bags which in turn are sandwiched betweenrigid or sem

35、irigid backing plates. By pressurizing the bag onone side of the module while the bag on the opposite side isvented to the atmosphere, a uniform pressure load equal to thepressure in the bag is applied to the module. By reversingwhich bag is pressurized and which is vented, an alternating orcyclic l

36、oad is applied.5.5.1.1 The distance between the module and the backingplates must be carefully adjusted to ensure that the pressureE1830 152within the air bag is applied to the panel and not reacted bymembrane tensile forces developed in the bag material. The airbag will not develop undesirable tens

37、ile stresses when pressur-ized appreciably less than its normal inflated thickness.5.5.1.2 The backing plates should not be so close to themodule that it can interfere with the deformation or deflectionof the module when the bag on the other side of the module isinflated.5.5.2 Piston and Pillow Sche

38、meWith this scheme, themodule is sandwiched between two rigid or semirigid platens,each driven by a pneumatic piston as the means for applyingforce. Air-filled pillows are used between the platens, and themodule surfaces to uniformly distribute the alternating frontand back force to the module surfa

39、ces.5.5.2.1 The air pillows should not be excessively inflated. Apillow will not develop undesirable tensile stresses if pressur-ized appreciably less than its normal inflated thickness.5.5.2.2 The opposing platen should not be so close to themodule that it can interfere with the deformation of them

40、odule.5.5.3 Suction and Pressure SchemeThis scheme is basedon attaching the module to a frame and plate which in turn isconnected to a pressure and suction system. With the modulesealed and secured to the test fixture, a plenum is created. Therequired cyclic load is applied by creating a positive pr

41、essureor a suction within this plenum.5.5.4 The pressure or suction shall be uniformly distributedover the module surfaces and controlled to 1440 6 45 Pa.5.5.5 The cycle rate shall not exceed 0.34 Hz.5.5.6 A counter is recommended for counting test cycles.6. Hazards6.1 Each of the mechanical tests d

42、escribed herein involvesrisks associated with the tests and the possibility of cata-strophic module failure.6.1.1 The test fixtures that involve masses such as bricks,blocks, or lead shot bags should be designed with a net or traylocated beneath the module to catch the weights and moduledebris shoul

43、d failure occur.6.1.2 Protective footwear and safety glasses should be wornto protect the test personnel from falling weights and brokenglass. Non-tempered glass can break with sharp-edged orpointed shards. Tempered glass breaks into a multitude ofsmall, granular shaped pieces, and these can be prop

44、elled along distance due to the release of the tension-compressionpre-stresses created during the tempering process.7. Procedures7.1 Electrical Tests Perform the following electrical testsbefore and after each of the test methods:7.1.1 Electrical PerformanceMeasure each module inaccordance with Test

45、 Methods E1036 to establish electricalperformance including maximum power.7.1.2 Ground Path Continuity TestTest each module forground path continuity in accordance with Test MethodsE1462.7.1.3 Insulation Integrity TestSubject each module to atest of the electrical isolation capability in accordance

46、with 7.1and 7.2 of Test Methods E1462.7.2 Visual InspectionVisually inspect each module inaccordance with Practice E1799 before and after each of thetest procedures is performed.7.3 Verify the ambient temperature is 20 6 10C.7.4 Twist Test Procedure:7.4.1 Connect the module leads to the open circuit

47、 faultdetection apparatus and begin monitoring.7.4.2 Fasten the module to the twist test fixture in accor-dance with the manufacturers recommended fasteners andprocedure.7.4.3 Twist the module to the required displacement asfollows (see Fig. 1):h 5 0.021 =L21W2(1)where:h = mounting point displacemen

48、t measured perpendicularto the diagonal between mounting points, m,L = length between mounting points, m, andW = width between mounting points, m.The displacement h corresponds to an angle of deformationof 1.2.7.4.4 Hold the module in the twisted position for 1 h.Discontinue the test if a failure oc

49、curs.7.4.5 Remove the module from the test fixture.7.4.6 Disconnect the module from the open circuit faultdetection apparatus.7.5 Static Load Procedure, 2400 Pa Wind Load Test:7.5.1 Mount the module in the static load test apparatus.FIG. 1 Deflection to be Applied by the Twist Test FixtureE1830 1537.5.2 Connect the module leads to the open circuit faultdetection apparatus and begin monitoring.7.5.3 Load the module. If the loading method involves theuse of small bags or other discrete objects such as bricks,pre-weigh enough units to achieve the required tot