ASTM E1802-2007 Standard Test Methods for Wet Insulation Integrity Testing of Photovoltaic Modules《光电模件的隔湿完整性测试用标准试验方法》.pdf

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1、Designation: E 1802 07Standard Test Methods forWet Insulation Integrity Testing of Photovoltaic Modules1This standard is issued under the fixed designation E 1802; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re

2、vision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 These test methods provide procedures to determine theinsulation resistance of a photovoltaic (PV) module, i.e. theelectrica

3、l resistance between the modules internal electricalcomponents and its exposed, electrically conductive, non-current carrying parts and surfaces.1.2 The insulation integrity procedures are a combination ofwet insulation resistance and wet dielectric voltage withstandtest procedures.1.3 These procedu

4、res are similar to and reference theinsulation integrity test procedures described in Test MethodsE 1462, with the difference being that the photovoltaic moduleunder test is immersed in a wetting solution during theprocedures.1.4 These test methods do not establish pass or fail levels.The determinat

5、ion of acceptable or unacceptable results isbeyond the scope of these test methods.1.5 The values stated in SI units are to be regarded as thestandard.1.6 There is no similar or equivalent ISO standard.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with i

6、ts use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For specificprecautionary statements, see Section 6.2. Referenced Documents2.1 ASTM Standards:2E 772 Terminology

7、 Relating to Solar Energy ConversionE 1328 Terminology Relating to Photovoltaic Solar EnergyConversionE 1462 Test Methods for Insulation Integrity and GroundPath Continuity of Photovoltaic Modules3. Terminology3.1 Definitions Definitions of terms used in this testmethod may be found in Terminology E

8、 772 and TerminologyE 1328.3.2 Definitions of Terms Specific to This Standard:3.2.1 insulation resistancethe electrical resistance of aphotovoltaic modules insulation, measured between the pho-tovoltaic circuit and exposed, electrically conductive non-current-carrying parts and surfaces of the modul

9、e.4. Significance and Use4.1 The design of a photovoltaic module or system intendedto provide safe conversion of the suns radiant energy intouseful electricity must take into consideration the possibility ofhazard should the user come into contact with the electricalpotential of the module or system

10、. In addition, the insulationsystem provides a barrier to electrochemical corrosion, andinsulation flaws can result in increased corrosion and reliabilityproblems. These test methods describe procedures for verify-ing that the design and construction of the module providesadequate electrical isolati

11、on through normal installation anduse. At no location on the module should the PV generatedelectrical potential be accessible, with the obvious exception ofthe output leads. This isolation is necessary to provide for safeand reliable installation, use, and service of the photovoltaicsystem.4.2 This

12、test method describes a procedure for determiningthe ability of the module to provide protection from electricalhazards. Its primary use is to find insulation flaws that could bedangerous to persons who may come into contact with themodule, especially when modules are wet. For example, theseflaws co

13、uld be small holes in the encapsulation that allowhazardous voltages to be accessible on the outside surface of amodule after a period of high humidity.4.3 Insulation flaws in a module may only become detect-able after the module has been wet for a certain period of time.For this reason, these proce

14、dures specify a minimum time amodule must be immersed prior to the insulation integritymeasurements.4.4 Electrical junction boxes attached to modules are oftendesigned to allow liquid water, accumulated from condensedwater vapor, to drain. Such drain paths are usually designed topermit water to exit

15、, but not to allow impinging water from rain1These test methods are under 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 March 1

16、, 2007. Published April 2007. Originallyapproved in 1996. Last previous edition approved in 2001 as E 1802 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the st

17、andards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.or water sprinklers to enter. It is important that all surfaces ofjunction boxes be thoroughly wetted by spraying during thetests to ena

18、ble these protective drain features to be properlytested. Therefore, drain holes should not be plugged or other-wise protected.4.5 These procedures may be specified as part of a series ofqualification tests involving performance measurements anddemonstration of functional requirements. Because insul

19、ationleakage resistance and insulation current leakage are strongfunctions of module dimensions, ambient relative humidity,absorbed water vapor and other factors, it is the responsibilityof the user of these test methods to specify the minimumacceptable leakage resistance.5. Apparatus5.1 In addition

20、 to the apparatus required for the insulationintegrity measurements of Test Methods E 1462, the followingapparatus is required:5.1.1 Wetting SolutionA solution of tap water and awetting agent3, with a surface tension of 0.03 N/m or less at 226 3C.5.1.2 Immersion Tray A tray containing the wetting so

21、lu-tion (see 5.1.1) into which the test module is immersed duringthe integrity measurements. The tray must be deep enough tocompletely immerse the laminate portion of the module, andany mating connectors (if used) in the wetting solution.NOTE 1This requirement does not imply that any electrical junc

22、tionboxes attached to the module must also be immersed.6. Hazards6.1 The electrical measurements used to determine theinsulation integrity require applying a high voltage between atest module and a wetting solution (see 5.1.1). Therefore, inaddition to the high voltage hazard, additional hazards may

23、exist due to unforeseen conductive paths between the high-voltage source and operators of the test through any spilledwetting solution.7. Procedure7.1 Assemble the required equipment and prepare the wet-ting solution.7.1.1 If both the dielectric voltage withstand and insulationresistance procedures

24、are to be performed, the tests may beperformed sequentially during a single immersion if theminimum 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 themodule in accordance with the wiring method speci

25、fied by themodule manufacturer. If more than one method is specified, usethe method least likely to restrict water entrance. Seal anythreaded openings intended to terminate electrical conduit,unless the threaded openings are selected as the most likely toallow entrance of water.7.2.2 Short the outpu

26、t 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 suchthat the front and back surfaces of the module are completelysubmerged. For framed modules, it may be n

27、ecessary to pourwetting solution directly onto the back surface. The interfacebetween the back surface and any leads or junction boxes mustbe completely submerged, but maintain the wetting solutionlevel below any junction box covers and vents in the junctionboxes (see 4.4). If mating connectors are

28、part of the moduledesign, the connectors must be immersed.7.2.5 Wet any unsubmerged surfaces of the module byspraying with the wetting solution.7.2.6 Ensure that the variable d-c voltage power supply isturned off before any electrical connections are made.7.2.7 Connect the ungrounded output of the p

29、ower supply tothe module output leads.7.2.8 Place the grounded output of the power supply in thewetting solution.7.2.9 Maintain the wetted condition of the module (see 7.2.4and 7.2.5) for a minimum of 2 min and a maximum of 10 min.7.2.10 Test the module for current leakage using the proce-dure in 7.

30、1.6 through 7.1.9 of Test Methods E 1462.7.2.11 Turn off the power supply.7.2.12 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 performedsequentially with the dielectric voltage withstand

31、test (see 7.1),prepare the module for the insulation resistance test using7.2.1-7.2.9 of the dielectric voltage withstand procedure.7.3.2 Measure and record the minimum insulation resis-tance according to 7.2 of Test Methods E 1462, using a voltageof 500 V or the rated system voltage, whichever is g

32、reater,between the shorted module leads and the wetting solution.7.3.3 Turn 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 aminimum:8.1.1 Module manufacturer and complete test specimen

33、identification.8.1.2 Description of module construction.8.1.3 Description of electrical measurement equipment, andmeasurement conditions or parameters, including total immer-sion time in the wetting solution.8.1.4 Results of the dielectric voltage withstand test asrequired by 8.1.5 of Test Methods E

34、 1462.8.1.5 Results of the insulation resistance test as required by8.1.7 of Test Methods E 1462.8.1.6 A description of any apparent changes as a result ofthe testing.8.1.7 Observations or indications of any shorting, arcing, orother failures.3An acceptable wetting solution is 1 part Liqui-nox deter

35、gent in 500 parts waterby volume.The sole source of supply of Liqui-Nox known to the committee at this time isAlconox, Inc., 9T East 40th St., New York, NY, 10016; as part number C6308-2. Ifyou are aware of alternative suppliers, please provide this information to ASTMInternational Headquarters. You

36、r comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.E18020728.1.8 Identification of areas of the module where problemswere found.8.1.9 Any deviations from the standard test procedures.9. Precision and Bias9.1 Because this test method

37、 uses the insulation integrityprocedures of Test Methods E 1462, the determination ofprecision and bias is not practicable, for the same reasonsstated in Test Methods E 1462.10. Keywords10.1 dielectric voltage withstand; electrical testing; energy;insulation integrity; insulation resistance; modules

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41、own 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 this 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).E1802073