BS EN 61663-1-2000 避雷装置.电信线路.光纤装置
时间:2024-05-09 18:01:13 来源: 标准资料网 作者：标准资料网 阅读：9343
【英文标准名称】:Lightningprotection-Telecommunicationlines-Fibreopticinstallations
【原文标准名称】:避雷装置.电信线路.光纤装置
【标准号】:BSEN61663-1-2000
【标准状态】:作废
【国别】:英国
【发布日期】:2000-06-15
【实施或试行日期】:2000-06-15
【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】:电信;远程通信;电气工程;保护(装置);定义;玻璃纤维电缆;雷击;抗扰性;光波导;电缆;光通信系统;通信电缆;通信设备;保护措施;光纤;电缆连接;大气的;纤维光缆;放电;电话线路;传输线路;通信传输线路;避雷装置
【英文主题词】:Atmospheric;Cableconnections;Cables;Communicationcables;Communicationtransmissionlines;Communications;Definitions;Discharge;Electricalengineering;Fibreopticalcables;Fibreoptics;Glassfibrecables;Immunity;Lightningprotection;Lightningstroke;Opticalcommunicationsystems;Opticalwaveguides;Protection;Protectivemeasures;Telecommunication;Telecommunications;Telephonelines;Transmissionlines
【摘要】:ThispartofIEC61663concernsthelightningprotectionoftelecommunicationlinesinfibreopticinstallations.Itsobjectistolimitthenumberofpossibleprimaryfailuresoccurringintheopticalfibrecableinaspecifiedinstallationtowithinvalueswhicharelowerthanorequaltothelimitvalue,definedasthetolerablefrequencyofprimaryfailures.Consequentlythisstandardpointsoutthemethodforcalculatingthepossiblenumberofprimaryfailures,choosingthefeasibleprotectivemeasuresandindicatingthetolerablefrequencyofprimaryfailures.Secondaryfailuresarenotconsideredinthisstandard.ThetestsdescribedinannexGofthisstandardareconvenientonlyfortheriskevaluationassociatedwithlightninginfibreopticinstallations.Testsforthequalificationofacabledesignareoutsidethescopeofthisstandard.
【中国标准分类号】:K49
【国际标准分类号】:33_040_01;33_180_01
【页数】:40P.;A4
【正文语种】:英语
【英文标准名称】:Instrumentsforintramedullarynailing;slottedhammer
【原文标准名称】:髓内受钉器械.带槽锤
【标准号】:DIN58830-1974
【标准状态】:现行
【国别】:德国
【发布日期】:1974-09
【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】:外科学;骨髓腔内插钉;医学;医学科学
【英文主题词】:surgery;medicine;medicalsciences;intramedullarynailings
【摘要】:Instrumentsforintramedullarynailing;slottedhammerInstrumentspourl'enclouagemédullaire;marteauàrainure
【中国标准分类号】:C35
【国际标准分类号】:0708
【页数】:1P;A4
【正文语种】:德语
【英文标准名称】:StandardTestMethodforCharacterizingtheEffectofExposuretoEnvironmentalCyclingonThermalPerformanceofInsulationProducts
【原文标准名称】:暴露于环境热循环对于保温产品的热性能的影响的标准试验方法
【标准号】:ASTMC1512-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:C16.33
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:environmentalcycling;thermalinsulation;Thermalinsulatingmaterials;Boardthermalinsulation;Composites--buildingapplications;Environmentalcontrol/fate;Fieldfabrication;Preformedthermalinsulation;Protectivefacings;Rigidthermalinsulatio
【摘要】:Exposingaspecimentoconditionsofone-directionalenvironmentalcyclingcanincreaseitsmoisturecontentuntiladecreaseinmaterialpropertiesoccurs(ataspecificnumberofcycles).Suchatestcouldbeinappropriateduetothenumberofcyclesrequiredtocauseadecreaseinmaterialpropertiessinceproductperformanceissuesoftenariseonlyaftermanyyearsofexposure.Theuseofapreconditioningprocedureisnotintendedtoduplicateexpectedfieldperformance.Ratherthepurposeistoincreasethemoisturecontentoftestmaterialspriortosubjectingtothemtoenvironmentalcycling.Themostimportantaspectofthepreconditioningprocedureisnon-uniformmoisturedistributioninthespecimen.Theheatflowisonedirectionalcausingmoistureflowtowardsthecoldsideresultinginzonesofdrymaterialonthewarmsideandhighmoisturecontentonthecoldside.(Whetherthehighmoisturecontentzoneislocatedrightatthecoldsurfaceofthespecimenoratsomedistancefromthissurfacedependsupontemperatureoscillationandabilityofthecoldsurfacetodryoutwards).Becausethepreconditioningprocedureinvolvesthermalgradient,thispreconditioningprocedureresultsinadistributionofmoisturecontentthatmayoccurunderfieldexposureconditions.However,theresultingmoisturecontentmaydiffersignificantlyfromthatwhichmaybedemonstratedintypicalproductapplications.Thepreconditioningresultsinaccumulationofmoistureinthethermalinsulationresultingfromthesimultaneousexposuretoadifferenceintemperatureandwatervaporpressure.Thistestmethodisnotintendedtoduplicatefieldexposure.Itisintendedtoprovidecomparativeratings.Asexcessiveaccumulationofmoistureinaconstructionsystemmayadverselyaffectitsperformance,thedesignershouldconsiderthepotentialformoistureaccumulationandthepossibleeffectsofthismoistureonthesystemperformance.1.1Thistestmethodisapplicabletopreformedorfieldmanufacturedthermalinsulationproducts,suchasboardstockfoams,rigidfibrousandcompositematerialsmanufacturedwithorwithoutprotectivefacings.SeeNote1Thistestmethodisnotapplicabletohightemperature,reflectiveorloosefillinsulation.Note18212;Iftheproductismanufacturedwithafacer,testproductwithfacerinplace.1.2Thistestmethodinvolvestwostages:preconditioningandenvironmentalcycling.Duringthefirststage,25mm(1in.)thickspecimensareusedtoseparatetwoenvironments.Eachoftheseenvironmentshasaconstantbutdifferenttemperatureandhumiditylevel.Duringtheenvironmentalcyclingstage,specimensalsodividetwoenvironmentsnamelyconstantroomtemperature/humidityononesideandcyclingtemperature/ambientrelativehumidityontheotherside.1.3Thistestmethodmeasurestheabilityoftheproducttomaintainthermalperformanceandcriticalphysicalattributesafterbeingsubjectedtostandardizedexposureconditions.Acomparisonismadebetweenmaterialpropertiesforreferencespecimensstoredinthelaboratoryforthetestperiodandspecimenssubjectedtothetwo-stagetestmethod.Toeliminatetheeffectofmoisturefromthecomparison,thematerialpropertiesofthelattertestspecimensaredeterminedaftertheyhavebeendriedtoconstantweight.Theaveragevaluedeterminedforeachofthetwosetsofspecimensisusedforcomparison.1.4Differentpropertiescanbemeasuredtoassesstheeffectofenvironmentalfactorsonthermalinsulation.Thistestmethodrequiresthatthermalresistancebedeterminedbaseduponanaverageforthreespecimensmeasuredaftercompletingthetest.Secondaryelementsofthistestmethodincludevisualobservationssuchascracking,delaminationorothersurfacedefects,as......
【中国标准分类号】:Q25
【国际标准分类号】:13_020_60
【页数】:7P.;A4
【正文语种】:英语