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【英文标准名称】:StandardPracticeforPreparationofInsulatingPaperandBoardImpregnatedwithaLiquidDielectric
【原文标准名称】:浸透液态电介质的纸及纸板绝缘性电制备的标准实施规程
【标准号】:ASTMD2413-1999(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1999
【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】:D09.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:board;dielectricstrength;dissipationfactor;drying;impulsestrength;oilimpregnation;paperpermittivity;pressboard;vacuumdrying;Dielectricbreakdownvoltage;Electricalinsulatingpaper/paperboard;Electricalproperties;Impregnateddie
【摘要】:DissipationFactorandRelativePermittivity8212;Knowledgeofthesepropertiesisimportantinthedesignofelectricalequipmentsuchascables,transformers,insulators,etc.Thenumericalproductofthesetwopropertiesofadielectricsystemisproportionaltotheenergylossconvertedtoheat,andiscalleditslossindex(seeTerminologyD1711).Theenergylossreducestheefficiencyofelectricalequipment.Theheatproducedtendstochemicallydegradethedielectricmaterialandmayevenleadtothermalrunaway.Testresultsofimpregnatedspecimenscandisclosesignificantdifferencesbetweencombinationsofpapersandoilsthatappearsimilarwhenthepapersandtheoilsaretestedseparately.Dissipationfactor,particularlyatelevatedtemperatures,isoftenchangedsignificantlybythepresenceofasmallquantityofimpuritiesineithertheliquidorthepaper.Thispracticeisusefulinthecomparisonofmaterialsandinevaluatingtheeffectsofdifferentpapersonagivenliquid.Judiciousanalysisofresultswithrespecttotime,temperature,andfieldstrengthshouldbeusefulinpredictingtheperformanceandcapabilitiesofsystemsusingthepaperandtheliquid.Foradditionalinformationonthesignificanceofdissipationfactorandrelativepermittivity,seeTestMethodsD150.TestMethodforDielectricBreakdownVoltageandDielectricStrengthofSolidElectricalInsulatingMaterialsatCommercialPowerFrequencies:Acomprehensivediscussionofthesignificanceofthedielectricstrengthtestasappliedtosolid,semi-solid,andliquidmaterialsisgiveninAppendixX1ofTestMethodD149.Otherfactorspeculiartohigh-qualitycompositeinsulations,suchasoil-impregnatedpapers,areconsideredinthefollowing:Intestsinvolvinghighelectricalstresses,immersionofcriticalpartsofatestcircuitinoilisawidelyusedtechniqueforinhibitingcorona.However,ithaslimitationsthatmustberecognizedwhenusingthesubmergedelectrodeoptionofthispractice(Note1).Attackonthepaperbycoronageneratedinthesurroundingfluidatelectrodeedgescanoccurwhetherthefluidisairoroil.Coronaoccursatconsiderablyhighervoltagesinoilthaninair.Thickanddensepapersaremorelikelytocausedischarge-initiatedbreakdowns.Forinterpretationofbreakdownmeasurementsthenumberofedgebreakdowns,implyingdischarge-initiatedbreakdowns,shouldbeconsidered.Note18212;Twotechniquesareinuseintheindustryfortestingspecimensfordielectricbreakdownvoltage.Inone,thetestismadewiththeelectrodesandtestspecimensubmergedintheimpregnatingliquidwhileintheothertheelectrodesarenotsubmerged,thatis,thespecimenistestedinair.Muchdatahasbeenaccumulatedusingthelattertechnique.Thesetechniquesyielddifferentvaluesofbreakdownvoltage.TestMethodD149statespreferencefortestingmaterialsinthemediuminwhichtheyareused.Theuseofsubmergedelectrodesfollowsthispreference.Whentestingthickinsulatingboards,theuseofsubmergedelectrodesisgreatlypreferred.Theresultsofpowerfrequencytestsonoilimpregnatedpapersareusefulforscreening,research,andqualitycontrol,providedthatconsiderablejudgmentisexercisedininterpretingtheresults.Theapplicationofthetestresultstoequipmentdesignandservicerequiresparticu........
【中国标准分类号】:K15
【国际标准分类号】:29_035_10
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:Glossaryofbuildingandcivilengineeringterms.Masonry.Termscommontomasonry
【原文标准名称】:建筑及土木工程术语词汇.第5部分:砌筑.第1节:砌筑常用术语
【标准号】:BS6100Sec.5.1-1992
【标准状态】:作废
【国别】:英国
【发布日期】:1992-09-15
【实施或试行日期】:
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:建筑;手工工具;拱;拱形结构;建设;施工;词汇;砖砌体工程;勾缝;模制材料;石
【英文主题词】:construction;arches;archedstructures;mouldings(shapedsection);pointing;vocabulary;stone;masonrywork;handtools
【摘要】:
【中国标准分类号】:P24
【国际标准分类号】:
【页数】:14P;A4
【正文语种】:英语