ASTM E1802-2012 Standard Test Methods for Wet Insulation Integrity Testing of Photovoltaic Modules《光电模件的隔湿完整性试验的标准试验方法》.pdf

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1、Designation: E1802 07 E1802 12Standard Test Methods forWet Insulation Integrity Testing of Photovoltaic Modules1This standard is issued under the fixed designation E1802; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of

2、last revision. 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 provide procedures to determine the insulation resistance of a photovoltaic (PV) module, i.e. theel

3、ectrical resistance between the modules internal electrical components and its exposed, electrically conductive, non-currentcarrying parts and surfaces.1.2 The insulation integrity procedures are a combination of wet insulation resistance and wet dielectric voltage withstand testprocedures.1.3 These

4、 procedures are similar to and reference the insulation integrity test procedures described in Test Methods E1462, withthe difference being that the photovoltaic module under test is immersed in a wetting solution during the procedures.1.4 These test methods do not establish pass or fail levels. The

5、 determination of acceptable or unacceptable results is beyondthe scope of these test methods.1.5 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.1.6 There is no similar or equivalent ISO standard.1.6 This standard does no

6、t purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. For specific precautionary statements, se

7、e Section 6.2. Referenced Documents2.1 ASTM Standards:2E772 Terminology of Solar Energy ConversionE1328 Terminology Relating to Photovoltaic Solar Energy Conversion (Withdrawn 2012)3E1462 Test Methods for Insulation Integrity and Ground Path Continuity of Photovoltaic Modules3. Terminology3.1 Defini

8、tions Definitions of terms used in this test method may be found in Terminology E772 and Terminology E1328.3.2 Definitions of Terms Specific to This Standard:3.2.1 insulation resistancethe electrical resistance of a photovoltaic modules insulation, measured between the photovoltaiccircuit and expose

9、d, electrically conductive non-current-carrying parts and surfaces of the module.4. Significance and Use4.1 The design of a photovoltaic module or system intended to provide safe conversion of the suns radiant energy into usefulelectricity must take into consideration the possibility of hazard shoul

10、d the user come into contact with the electrical potential ofthe module or system. In addition, the insulation system provides a barrier to electrochemical corrosion, and insulation flaws canresult in increased corrosion and reliability problems. These test methods describe procedures for verifying

11、that the design andconstruction of the module provides adequate electrical isolation through normal installation and use. At no location on the moduleshould the PV generated electrical potential be accessible, with the obvious exception of the output leads. This isolation isnecessary to provide for

12、safe and reliable installation, use, and service of the photovoltaic system.1 These test methods are under the jurisdiction of ASTM Committee E44 on Solar, Geothermal and Other Alternative Energy Sources and are the direct responsibility ofSubcommittee E44.09 on Photovoltaic Electric Power Conversio

13、n.Current edition approved March 1, 2007Dec. 1, 2012. Published April 2007December 2012. Originally approved in 1996. Last previous edition approved in 20012007as E1802 01.E1802 07. DOI: 10.1520/E1802-07.10.1520/E1802-12.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or conta

14、ct ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have bee

15、n made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document

16、.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.2 This test method describes a procedure for determining the ability of the module to provide protection from electricalhazards. Its primary use is to find insulation flaws that could

17、 be dangerous to persons who may come into contact with the module,especially when modules are wet. For example, these flaws could be small holes in the encapsulation that allow hazardous voltagesto be accessible on the outside surface of a module after a period of high humidity.4.3 Insulation flaws

18、 in a module may only become detectable after the module has been wet for a certain period of time. Forthis reason, these procedures specify a minimum time a module must be immersed prior to the insulation integrity measurements.4.4 Electrical junction boxes attached to modules are often designed to

19、 allow liquid water, accumulated from condensed watervapor, to drain. Such drain paths are usually designed to permit water to exit, but not to allow impinging water from rain or watersprinklers to enter. It is important that all surfaces of junction boxes be thoroughly wetted by spraying during the

20、 tests to enablethese protective drain features to be properly tested. Therefore, drain holes should not be plugged or otherwise protected.4.5 These procedures may be specified as part of a series of qualification tests involving performance measurements anddemonstration of functional requirements.

21、Because insulation leakage resistance and insulation current leakage are strong functionsof module dimensions, ambient relative humidity, absorbed water vapor and other factors, it is the responsibility of the user of thesetest methods to specify the minimum acceptable leakage resistance.5. Apparatu

22、s5.1 In addition to the apparatus required for the insulation integrity measurements of Test Methods E1462, the followingapparatus is required:5.1.1 Wetting SolutionA solution of tap water and a wetting agent3, with a surface tension of 0.03 N/m or less at 22 6 3C.5.1.2 Immersion Tray A tray contain

23、ing the wetting solution (see 5.1.1) into which the test module is immersed during theintegrity measurements. The tray must be deep enough to completely immerse the laminate portion of the module, and any matingconnectors (if used) in the wetting solution.NOTE 1This requirement does not imply that a

24、ny electrical junction boxes attached to the module must also be immersed.6. Hazards6.1 The electrical measurements used to determine the insulation integrity require applying a high voltage between a test moduleand a wetting solution (see 5.1.1). Therefore, in addition to the high voltage hazard, a

25、dditional hazards may exist due to unforeseenconductive paths between the high-voltage source and operators of the test through any spilled wetting solution.7. Procedure7.1 Assemble the required equipment and prepare the wetting solution.7.1.1 If both the dielectric voltage withstand and insulation

26、resistance procedures are to be performed, the tests may beperformed sequentially during a single immersion if the minimum and maximum soak time requirement of 7.2.9 is met.7.2 Dielectric Voltage Withstand Procedure:7.2.1 Unless already provided, connect output leads to the module in accordance with

27、 the wiring method specified by themodule manufacturer. If more than one method is specified, use the method least likely to restrict water entrance. Seal any threadedopenings intended to terminate electrical conduit, unless the threaded openings are selected as the most likely to allow entranceof w

28、ater.7.2.2 Short the output leads of the test module.7.2.3 Place the test module face down in the immersion tray, with the output leads held out of the immersion tray.7.2.4 Add the wetting solution to the immersion tray such that the front and back surfaces of the module are completelysubmerged. For

29、 framed modules, it may be necessary to pour wetting solution directly onto the back surface. The interface betweenthe back surface and any leads or junction boxes must be completely submerged, but maintain the wetting solution level belowany junction box covers and vents in the junction boxes (see

30、4.4). If mating connectors are part of the module design, theconnectors must be immersed.7.2.5 Wet any unsubmerged surfaces of the module by spraying with the wetting solution.7.2.6 Ensure that the variable d-c voltage power supply is turned off before any electrical connections are made.7.2.7 Conne

31、ct the ungrounded output of the power supply to the module output leads.7.2.8 Place the grounded output of the power supply in the wetting solution.7.2.9 Maintain the wetted condition of the module (see 7.2.4 and 7.2.5) for a minimum of 2 min and a maximum of 10 min.7.2.10 Test the module for curren

32、t leakage using the procedure in 7.1.6 through 7.1.9 of Test Methods E1462.7.2.11 Turn off the power supply.3 An acceptable wetting solution is 1 part Liqui-nox detergent in 500 parts water by volume.The sole source of supply of Liqui-Nox known to the committee at this time is Alconox, Inc., 9T East

33、 40th St., New York, NY, 10016; as part number C6308-2. If youare aware of alternative suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting ofthe responsible technical committee,1 which you may attend.E1802 1227.

34、2.12 Disconnect the test module.7.2.13 Remove the module from the immersion tray.7.3 Insulation Resistance Procedure:7.3.1 If the insulation resistance test is not performed sequentially with the dielectric voltage withstand test (see 7.1), preparethe module for the insulation resistance test using

35、7.2.1-7.2.9 of the dielectric voltage withstand procedure.7.3.2 Measure and record the minimum insulation resistance according to 7.2 of Test Methods E1462, using a voltage of 500V or the rated system voltage, whichever is greater, between the shorted module leads and the wetting solution.7.3.3 Turn

36、 off the power supply.7.3.4 Disconnect the test module.7.3.5 Remove the module from the immersion tray.8. Report8.1 The report shall include the following items as a minimum:8.1.1 Module manufacturer and complete test specimen identification.8.1.2 Description of module construction.8.1.3 Description

37、 of electrical measurement equipment, and measurement conditions or parameters, including total immersiontime in the wetting solution.8.1.4 Results of the dielectric voltage withstand test as required by 8.1.5 of Test Methods E1462.8.1.5 Results of the insulation resistance test as required by 8.1.7

38、 of Test Methods E1462.8.1.6 A description of any apparent changes as a result of the testing.8.1.7 Observations or indications of any shorting, arcing, or other failures.8.1.8 Identification of areas of the module where problems were found.8.1.9 Any deviations from the standard test procedures.9. P

39、recision and Bias9.1 Because this test method uses the insulation integrity procedures of Test Methods E1462, the determination of precision andbias is not practicable, for the same reasons stated in Test Methods E1462.10. Keywords10.1 dielectric voltage withstand; electrical testing; energy; insula

40、tion integrity; insulation resistance; modules; photovoltaics;solarASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any

41、such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are inv

42、ited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received

43、 a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of th

44、is standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).3 The last approved version of this historical standard is referenced on www.astm.org.E1802 123