MIL-D-3134J (NAVY) (AMENDMENT 1)
时间:2024-05-10 12:05:25 来源: 标准资料网 作者：标准资料网 阅读：9362
MIL-D-3134J (NAVY) (AMENDMENT 1), MILITARY SPECIFICATION, DECK COVERING MATERIALS (12 SEP 1989)., This amendment forms a part of MIL-D-3134J(NAVY), dated 5 October 1988, and is approved for use by the Department of the Navy and is available for use by all Departments and Agencies of the Department of Defense.
【英文标准名称】:Dry,solidinsulatingmaterials-Resistancetesttohigh-voltage,low-currentarcdischarges
【原文标准名称】:干性固体绝缘材料.高电压低电流电弧放电电阻试验
【标准号】:BSEN61621-1998
【标准状态】:现行
【国别】:英国
【发布日期】:1998-02-15
【实施或试行日期】:1998-02-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:耐电弧性;电流;定义;电弧;电气工程;电绝缘材料;高电压;耐高压试验;绝缘材料;绝缘件;耐力;测试;电压
【英文主题词】:Arcresistance;Currents;Definition;Definitions;Electricarcs;Electricalengineering;Electricalinsulatingmaterials;Highvoltage;High-voltagetests;Insulatingmaterials;Insulations;Resistance;Testing;Voltage
【摘要】:ThisInternationalStandarddescribesatestmethodwhichcanprovidepreliminarydifferentiationbetweensimilarinsulatingmaterials,withrespecttotheirresistancetodamagewhenexposedtohigh-voltage,low-currentarcdischarges,occurringclosetotheirsurfaces.Thedischargescauselocalizedthermalandchemicaldecompositionanderosionandeventuallyaconductivepathformsacrosstheinsulatingmaterial.Theseverityofthetestconditionsisgraduallyincreased:intheearlystagesalow-currentarcdischargeisrepeatedlyinterrupted,whereasinthelaterstages,thearccurrentisraisedinsuccessivesteps.Becauseofitsconvenienceandbecauseoftheshorttimerequiredfortesting,thetestmethodisapplicableforpreliminaryscreeningofmaterials,fordetectingtheeffectsofchangesinformulationandforqualitycontroltesting.Previousexperiencewiththistest,showedacceptablereproducibilitywiththermosetmaterials.Usingthermoplastics,sometestinglaboratoriesreportunacceptablylargevariationintestresultswhichleadtotherecommendationnottousethetestforthermoplastics.NOTE-Attemptsarebeingmadetoreducethevariabilityoftheresultsoftestsonthermoplasticsbycontrollingtheelectrodepressureanddepthofpenetrationintothematerialduringthetest.Withoutsuchelectrodecontrol,testsonmanythermoplasticsmaynotbesufficientlymeaningfultobeperformed.Thistestmethodwillnot,ingeneral,permitconclusionstobedrawnconcerningtherelativearcresistancerankingsofmaterialswhichmaybesubjectedtoothertypesofarcs.Therankingofmaterialsmaydifferfromthatfoundinwettrackingtests(e.g.IEC60112,IEC60587andIEC61302)andfromtheirperformanceinservice,wheretheintensity,recurrencefrequencyandtimeofexposuretoarcdischargesareverydifferent.
【中国标准分类号】:K15
【国际标准分类号】:29_035_01
【页数】:18P;A4
【正文语种】:英语
【英文标准名称】:Welding-Acceptanceinspectionofelectronbeamweldingmachines-Part5:Measurementofrun-outaccuracy
【原文标准名称】:焊接电子束焊接机的验收检验第5部分:偏转精度的测量
【标准号】:ISO14744-5-2000
【标准状态】:现行
【国别】:国际
【发布日期】:2000-04
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC44
【标准类型】:()
【标准水平】:()
【中文主题词】:电子束;焊机;熔焊;验收规范;焊接;电子束焊;验收检验;焊接设备;测量;测量;移动准确度;电焊
【英文主题词】:Acceptanceinspection;Acceptancespecification;Definitions;Electricwelding;Electronbeams;Electron-beamwelding;Fusionwelding;Inspection;Measurement;Measurementset-up;Measuring;Measuringinstruments;Measuringtechniques;Movementaccuracy;Precision;Testing;Welding;Weldingengineering;Weldingequipment;Weldingmachines;Weldingparameters
【摘要】:Thisstandardisintendedforusewhentherun-outaccuracyofthemovingpartsofelectronbeamweldingmachinescomplyingwithENISO14744-1istobemeasuredinconnectionwithanacceptanceinspection.Itprovidesinformationontheprocedureandapparatustobeusedformakingthemeasurements.Giventhegreatvarietyofelectronbeamweldingmachines,thescopeofmeasurementsrequiredforacceptanceinspectionpurposesshouldbespecifiedseparatelyforthemachineconcerned.Run-outaccuracyasdefinedhereisasystematicerrorandthuscountsasoneoftheparametersbywhichtheperformanceofamachinetoolcanbecharacterized.Otherfactorsinfluencingperformance(e.g.dynamicforces,vacuumlevel,positioningaccuracyofCNCmachines)andmethodsofstatisticalevaluationarenotcoveredinthisstandard.Electronbeamweldinginvolvesmovementoftheworkpieceand/oroftheelectrongun.Successfulweldingpresupposesthatthismovementiseffectedbythedevicesconcerned(e.g.worktableandrotatingfixture)withagivendegreeofaccuracy.Thepurposeofthemeasurementisthustocheckwhetherandtowhatextenttherequiredrun-outaccuracyismaintained.
【中国标准分类号】:J64
【国际标准分类号】:25_160_30
【页数】:8P.;A4
【正文语种】:英语