【英文标准名称】:StandardTestMethodforDielectricBreakdownVoltageandDielectricStrengthofSolidElectricalInsulatingMaterialsUsingImpulseWaves
【原文标准名称】:用脉冲波法测定固体电绝缘材料的电介质击穿电压及抗电强度的标准试验方法
【标准号】:ASTMD3426-1997(2004)
【标准状态】:现行
【国别】:
【发布日期】:1997
【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】:D09.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:电介质击穿;抗电强度;电气工程;电绝缘材料;电绝缘;电气试验;绝缘;试验
【英文主题词】:dielectricbreakdown;dielectricbreakdowncriteria;dielectricbreakdownvoltage;dielectricstrength;full-impulse-voltagewave;impulsedielectricstrength;impulsegenerator;impulsewaves;lightningstrokes;peakvalue;simulated-lightningi
【摘要】:Insulatingmaterialsusedinhigh-voltageequipmentmaybesubjectedtotransientvoltagestresses,resultingfromsuchcausesasnearbylightningstrokes.Thisisparticularlytrueofapparatussuchastransformersandswitchgearusedinelectrical-powertransmissionanddistributionsystems.Theabilityofinsulatingmaterialstowithstandthesetransientvoltagesisimportantinestablishingthereliabilityofapparatusinsulatedwiththesematerials.Transientvoltagescausedbylightningmaybeofeitherpositiveornegativepolarity.Inasymmetricalfieldbetweenidenticalelectrodes,thepolarityhasnoeffectonthebreakdownstrength.However,withdissimilarelectrodestheremaybeapronouncedpolarityeffect.Itiscommonpracticewhenusingdissimilarelectrodes,tomakenegativethatelectrodeatwhichthehighergradientwillappear.Whenasymmetricalelectrodesareusedfortestingmaterialswithwhichthetesterhasnopreviousexperienceorknowledge,itisrecommendedthathemakecomparativetestswithpositivepolarityandnegativepolarityappliedtothehighergradient,orsmallerelectrode,todeterminewhichpolarityproducesthelowerbreakdownvoltage.Thestandardwaveshapeisa1.2by50-x03BC;swave,reachingpeakvoltageinapproximately1.2x03BC;sanddecayingto50%ofpeakvoltageinapproximately50x03BC;safterthebeginningofthewave.Thiswaveisintendedtosimulatealightningstrokethatmaystrikeasystemwithoutcausingfailureonthesystem.Formostmaterials,theimpulsedielectricstrengthwillbehigherthaneitheritspowerfrequencyalternatingvoltageoritsdirectvoltagedielectricstrengths.Becauseoftheshorttimeinvolved,dielectricheatingandotherthermaleffectsarelargelyeliminatedduringimpulsetesting.Thus,theimpulsetestgivesvaluesclosertotheintrinsicbreakdownstrengththandolongertimetests.Fromcomparisonsoftheimpulsedielectricstrengthwiththevaluesobtainedfromlongertimetests,inferencesmaybedrawnastothemodesoffailuresunderthevarioustestsforagivenmaterial.AppendixX1ofTestMethodD149shouldbereferredtoforfurtherinformationonthissubject.1.1Thistestmethodcoversthedeterminationofdielectricstrengthofsolidelectricalinsulatingmaterialsundersimulated-lightningimpulseconditions.1.2Proceduresaregivenfortestsusingstandard1.2by50sfull-waveimpulses.1.3Thistestmethodisintendedforuseindeterminingtheimpulsedielectricstrengthofinsulatingmaterials,eitherusingsimpleelectrodesorfunctionalmodels.Itisnotintendedforuseinimpulsetestingofapparatus.1.4ThistestmethodissimilartoIECPublication243-3.AllproceduresinthistestmethodareincludedinIEC243-3.DifferencesbetweenthistestmethodandIEC243-3arelargelyeditorial.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecificprecautionstatementsaregiveninSection9.
【中国标准分类号】:K15
【国际标准分类号】:
【页数】:4P.;A4
【正文语种】:


【英文标准名称】:Cableddistributionsystemsfortelevisionandsoundsignals-Part5:Headendequipment;GermanversionEN50083-5:1994
【原文标准名称】:无线电广播和电视广播信号用电缆分配系统.第5部分:顶部设备
【标准号】:DINEN50083-5-1995
【标准状态】:作废
【国别】:德国
【发布日期】:1995-06
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:规范(批准);广播设备;频带宽度;电缆分布系统;分布系统;终端站;定义;电视信号;电视技术;广播信号;音频信号;噪声测量;声传输;电磁兼容性;电磁兼容性;互相调制;电缆电视;传输;声音广播;电视;测量技术;广播;传输技术;测
【英文主题词】:
【摘要】:
【中国标准分类号】:M74
【国际标准分类号】:33_060_40
【页数】:39P;A4
【正文语种】:德语