1、Designation: E1802 12 (Reapproved 2018)Standard 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
2、 year of 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 theinsulation resistance of a photovoltaic (PV) module, i.
3、e. theelectrical 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.
4、3 These procedures are similar to and reference theinsulation integrity test procedures described in Test MethodsE1462, 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.
5、The determination of acceptable or unacceptable results isbeyond the scope of these test methods.1.5 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concerns, if any
6、, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific precautionary statements, see Section 6.1.7 This international st
7、andard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2.
8、 Referenced Documents2.1 ASTM Standards:2E772 Terminology of Solar Energy ConversionE1462 Test Methods for Insulation Integrity and GroundPath Continuity of Photovoltaic Modules3. Terminology3.1 DefinitionsDefinitions of terms used in this testmethod may be found in Terminology E772.3.2 Definitions
9、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 module.4. Significance and Use4.1 The design of
10、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. In addition, the insulationsystem provide
11、s 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 isolation through normal installation anduse. At n
12、o 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 test method describes a procedure for deter
13、miningthe 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 the1These test methods are under the jurisdiction of ASTM Committee E44 onSolar, Geothermal and Other Alternative
14、 Energy Sources and are the directresponsibility of Subcommittee E44.09 on Photovoltaic Electric Power Conversion.Current edition approved May 1, 2018. Published May 2018. Originallyapproved in 1996. Last previous edition approved in 2012 as E1802 12. DOI:10.1520/E1802-12R18.2For referenced ASTM sta
15、ndards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
16、PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization
17、 Technical Barriers to Trade (TBT) Committee.1module, especially when modules are wet. For example, theseflaws could 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 ma
18、y only become detect-able after the module has been wet for a certain period of time.For this reason, these procedures 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 wat
19、er, accumulated from condensedwater vapor, to drain. Such drain paths are usually designed topermit water to exit, but not to allow impinging water from rainor water sprinklers to enter. It is important that all surfaces ofjunction boxes be thoroughly wetted by spraying during thetests to enable the
20、se 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 insulationle
21、akage 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 to the
22、 apparatus required for the insulationintegrity measurements of Test Methods E1462, 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 TrayA tray containing the wetting solu-tion (
23、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 junctionboxes
24、 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 mayexist due
25、 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 are to be
26、 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 specified by t
27、hemodule 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 output leads o
28、f 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 necessary
29、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 part of t
30、he 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 power supp
31、ly 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 7.1.6 throu
32、gh 7.1.9 of Test Methods E1462.7.2.11 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 test (see
33、7.1),prepare the module for the insulation resistance test using 7.2.1 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 E1462, using a voltageof 500 V or the rated system voltage, whichever is greater,bet
34、ween 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.3An acceptable wetting solution is 1 part Liqui-nox detergent in 500 parts waterby volume.The sole source of supply of Liqui-Nox kno
35、wn 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. Your comments will receive careful consideration at ameeting of the responsibl
36、e technical committee,1which you may attend.E1802 12 (2018)28. Report8.1 The report shall include the following items as aminimum:8.1.1 Module manufacturer and complete test specimenidentification.8.1.2 Description of module construction.8.1.3 Description of electrical measurement equipment, andmeas
37、urement 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 E1462.8.1.5 Results of the insulation resistance test as required by8.1.7 of Test Methods E1462.8.1.6 A description of
38、any apparent changes as a result ofthe testing.8.1.7 Observations or indications of any shorting, arcing, orother failures.8.1.8 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 use
39、s the insulation integrityprocedures of Test Methods E1462, the determination ofprecision and bias is not practicable, for the same reasonsstated in Test Methods E1462.10. Keywords10.1 dielectric voltage withstand; electrical testing; energy;insulation integrity; insulation resistance; modules; phot
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