【英文标准名称】:StandardTestMethodforThermalEnduranceofFlexibleElectricalInsulatingVarnishes
【原文标准名称】:柔性电绝缘漆耐热性的标准试验方法
【标准号】:ASTMD1932-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D09.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:覆层;耐用试验;绝缘;热学;热稳定性;电气工程;试验;电绝缘
【英文主题词】:dielectricstrength;glassfiberfabric;thermalendurance;varnish
【摘要】:Amajorfactoraffectingthelongtermperformanceofinsulatingmaterialsisthermaldegradation.Otherfactors,suchasmoistureandvibration,maycausefailuresafterthematerialhasbeenweakenedbythermaldegradation.Anelectricalinsulatingvarnishiseffectiveinprotectingelectricalequipmentonlyaslongasitretainsitsphysicalandelectricalintegrity.Thethermaldegradationofthevarnishresultsinweightloss,porosity,crazing,andgenerallyareductioninflexibility.Degradationofthevarnishcanbedetectedbyadecreaseindielectricstrength,whichisthereforeusedasthefailurecriterionforthistestmethod.Electricalinsulatingvarnishesundergoflexinginserviceduetovibrationandthermalexpansion.Forthisreason,thisfunctionaltestincludesflexingandelongationoftheinsulation.Theelectrodesusedinthistestmethodaredesignedtoelongatetheoutersurfaceofthespecimen2%withrespecttotheneutralaxisofthebasefiberwhilebeingtestedfordielectricbreakdown.1.1Thistestmethodcoversthedeterminationoftherelativethermalenduranceofflexibleelectricalinsulatingvarnishesbydeterminingthetimenecessaryatelevatedtemperaturestodecreasethedielectricbreakdownofthevarnishtoanarbitrarilyselectedvaluewhenappliedtoastandardglassfiberfabric.1.2Thistestmethoddoesnotapplytovarnishesthatloseahighpercentageoftheirdielectricbreakdownvoltagewhenflexedbeforeelevatedtemperatureexposureasprescribedinthescreeningtest(Section9).Examplesofsuchvarnishesarethoseusedforhighspeedarmaturesandlaminatedstructures.Also,thistestmethodisnotapplicabletovarnisheswhichdistortsufficientlyduringthermalelevatedtemperatureexposuresothattheycannotbetestedusingthecurvedelectrodeassembly.1.3Thermalenduranceisexpressedintermsofatemperatureindex.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection7.1.5ThevaluesstatedinSIunitsarethestandard.ThereisnoequivalentIECorISOstandard.
【中国标准分类号】:K15
【国际标准分类号】:29_035_60
【页数】:5P.;A4
【正文语种】: