EN 61754-4-1-2003 纤维光学连接器接口.第4-1部分:SC型连接器系列.简化的SC-PC型连接器插座接口
作者:标准资料网 时间:2024-05-20 21:19:39 浏览:8164
来源:标准资料网
【英文标准名称】:Fibreopticconnectorinterfaces-Part4-1:TypeSCconnectorfamily;SimplifiedreceptacleSC-PCconnectorinterfaces(IEC61754-4-1:2003);GermanversionEN61754-4-1:2003
【原文标准名称】:纤维光学连接器接口.第4-1部分:SC型连接器系列.简化的SC-PC型连接器插座接口
【标准号】:EN61754-4-1-2003
【标准状态】:现行
【国别】:
【发布日期】:2003-09
【实施或试行日期】:2003-09-01
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:界面;尺寸;插孔;组件;指导手册;连接工艺;型式;光波导;连接器;纤维光学;电气工程;插接件连接;电插头;连接器元件;工程图
【英文主题词】:Components;Connectiontechnology;Connectorelements;Connectoredjoints;Connectors;Dimensions;Electricplugs;Electricalengineering;Engineeringdrawings;Fibreoptics;Guidebooks;Interfaces;Opticalwaveguides;Receptacles;Types
【摘要】:
【中国标准分类号】:M33
【国际标准分类号】:33_180_20
【页数】:10P.;A4
【正文语种】:英语
【英文标准名称】:Short-circuitcurrentsinthree-phasea.c.systems-Part0:Calculationofcurrents
【原文标准名称】:三相交流系统短路电流第0部分：电流计算
【标准号】:IEC60909-0-2001
【标准状态】:现行
【国别】:国际
【发布日期】:2001-07
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/TC73
【标准类型】:()
【标准水平】:()
【中文主题词】:三相电流;短路电流;交流电流;电流;电气工程;数学计算
【英文主题词】:Alternatingcurrent;Currents;Definitions;Electricpowernetworks;Electricalengineering;Electrically-operateddevices;Faultcurrents;Highvoltage;Lowvoltage;Mathematicalcalculations;Properties;Shortcircuitimpedance;Shortcircuits;Short-circuitcurrents;Symbols;Three-phasecurrent;Three-phasenetworks
【摘要】:ThispartofIEC60909isapplicabletothecalculationofshort-circuitcurrents:·inlow-voltagethree-phasea.c.systems·inhigh-voltagethree-phasea.c.systemsoperatingatanominalfrequencyof50Hzor60Hz.Systemsathighestvoltagesof550kVandabovewithlongtransmissionlinesneedspecialconsideration.ThispartofIEC60909establishesageneral,practicableandconciseprocedureleadingtoresults,whicharegenerallyofacceptableaccuracy.Forthiscalculationmethod,anequivalentvoltagesourceattheshort-circuitlocationisintroduced.Thisdoesnotexcludetheuseofspecialmethods,forexamplethesuperpositionmethod,adjustedtoparticularcircumstances,iftheygiveatleastthesameprecision.Thesuperpositionmethodgivestheshort-circuitcurrentrelatedtotheoneloadflowpresupposed.Thismethod,therefore,doesnotnecessarilyleadtothemaximumshort-circuitcurrent.ThispartofIEC60909dealswiththecalculationofshort-circuitcurrentsinthecaseofbalancedorunbalancedshortcircuits.Incaseofanaccidentalorintentionalconductivepathbetweenonelineconductorandlocalearth,thefollowingtwocasesmustbeclearlydistinguishedwithregardtotheirdifferentphysicalpropertiesandeffects(resultingindifferentrequirementsfortheircalculation):·line-to-earthshortcircuit,occurringinasolidlyearthedneutralsystemoranimpedanceearthedneutralsystem;·asingleline-to-earthfault,occurringinanisolatedneutralearthedsystemoraresonanceearthedneutralsystem.Thisfaultisbeyondthescopeof,andisthereforenotdealtwithin,thisstandard.Forcurrentsduringtwoseparatesimultaneoussingle-phaseline-to-earthshortcircuitsinanisolatedneutralsystemoraresonanceearthedneutralsystem,seeIEC60909-3.Short-circuitcurrentsandshort-circuitimpedancesmayalsobedeterminedbysystemtests,bymeasurementonanetworkanalyzer,orwithadigitalcomputer.Inexistinglow-voltagesystemsitispossibletodeterminetheshort-circuitimpedanceonthebasisofmeasurementsatthelocationoftheprospectiveshortcircuitconsidered.Thecalculationoftheshort-circuitimpedanceisingeneralbasedontherateddataoftheelectricalequipmentandthetopologicalarrangementofthesystemandhastheadvantageofbeingpossiblebothforexistingsystemsandforsystemsattheplanningstage.Ingeneral,twoshort-circuitcurrents,whichdifferintheirmagnitude,aretobecalculated:·themaximumshort-circuitcurrentwhichdeterminesthecapacityorratingofelectricalequipment;and·theminimumshort-circuitcurrentwhichcanbeabasis,forexample,fortheselectionoffuses,forthesettingofprotectivedevices,andforcheckingtherun-upofmotors.NOTEThecurrentinathree-phaseshortcircuitisassumedtobemadesimultaneouslyinallpoles.Investigationsofnon-simultaneousshortcircuits,whichmayleadtohigheraperiodiccomponentsofshort-circuitcurrent,arebeyondthescopeofthisstandard.Thisstandarddoesnotcovershort-circuitcurrentsdeliberatelycreatedundercontrolledconditions(short-circuittestingstations).ThispartofIEC60909doesnotdealwiththecalculationofshort-circuitcurrentsininstallationsonboardshipsandaeroplanes.
【中国标准分类号】:K04
【国际标准分类号】:17_220_01
【页数】:137P.;A4
【正文语种】:英语
【英文标准名称】:Watertubeboilersandauxiliaryinstallations-Part15:Acceptancetests;GermanversionEN12952-15:2003
【原文标准名称】:水管锅炉和辅助设备.第15部分:验收试验
【标准号】:DINEN12952-15-2004
【标准状态】:现行
【国别】:德国
【发布日期】:2004-01
【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】:
【英文主题词】:
【摘要】:ThisEuropeanStandardcoversdirect-firedsteamandhotwatergenerators,includingtheauxiliaries.Forthepurposesofthisstandard,steamandhotwatergeneratorsarevesselsandpipeworksystemsinwhich:-steamatapressurehigherthanatmosphericpressureisgeneratedforuseexternaltothesystem;-waterisheatedtoatemperaturehigherthanthesaturationtemperatureatatmosphericpressureforuseexternaltothesystem.
【中国标准分类号】:J98
【国际标准分类号】:27_040
【页数】:91P;A4
【正文语种】:德语
