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【英文标准名称】:Short-circuitcurrentsind.cauxiliaryinstallationsinpowerplantsandsubstations-Calculationofshort-circuitcurrents
【原文标准名称】:发电厂和变电所直流辅助设备短路电流.第1部分:短路电流计算
【标准号】:BSEN61660-1-1997
【标准状态】:现行
【国别】:英国
【发布日期】:1997-10-15
【实施或试行日期】:1997-10-15
【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】:电桥;三相电流;发电站;误差修正;电力传输;电路;直流电传输;电阻;公式;电容器;短路电流;电池;直流发电机;辅助的;电动机;直流电流;交流电流;电气设备;电力变换器;电力设备;数学计算
【英文主题词】:Bridgecircuits;Circuits;Definitions;Directcurrent;Directcurrentinstallations;Electricconvertors;Electricpowernetworks;Electricpowerstations;Electricalengineering;Faultcurrents;Mathematicalcalculations;Methodsofcalculation;Plant;Shortcircuitimpedance;Shortcircuits;Short-circuitcurrents;Substation;Switchgears;Symbols;Three-phase
【摘要】:ThispartofIEC61660describesamethodforcalculatingshort-circuitcurrentsind.c.auxiliarysystemsinpowerplantsandsubstations.Suchsystemscanbeequippedwiththefollowingequipment,actingasshort-circuitcurrentsources:-rectifiersinthree-phasea.c.bridgeconnectionfor50Hz;-stationarylead-acidbatteries;-smoothingcapacitors;-d.c.motorswithindependentexcitation.NOTE-Rectifiersinthree-phasea.c.bridgeconnectionfor60Hzareunderconsideration.Thedataofotherequipmentmaybegivenbythemanufacturer.Thisstandardisonlyconcernedwithrectifiersinthree-phasea.c.bridgeconnection.Itisnotconcernedwithothertypesofrectifiers.Thepurposeofthestandardistoprovideagenerallyapplicablemethodofcalculationwhichproducesresultsofsufficientaccuracyontheconservativeside.Specialmethods,adjustedtoparticularcircumstances,maybeusediftheygiveatleastthesameprecision.Short-crrcuitcurrents,resistancesandinductancesmayalsobeascertainedfromsystemtestsormeasurementsonmodelsystems.Inexistingd.c.systemsthenecessaryvaluescanbeascertainedfrommeasurementstakenattheassumedshort-circuitlocation.Theloadcurrentisnottakenintoconsiderationwhencalculatingtheshort-circuitcurrent.Itisnecessarytodistinguishbetweentwodifferentvaluesofshort-circuitcurrent:-themaximumshort-circuitcurrentwhichdeterminestheratingoftheelectricalequipment;-theminimumshort-circuitcurrentwhichcanbetakenasthebasisforfuseandprotectionratingsandsettings.
【中国标准分类号】:F20
【国际标准分类号】:17_220_01;29_240_01
【页数】:40P.;A4
【正文语种】:英语


【英文标准名称】:Testingofleather;determinationofcontentofconstituentsextractablebydichlormethane
【原文标准名称】:皮革的检验.可用二氯甲烷萃取的成分含量的测定
【标准号】:DIN53306-1977
【标准状态】:作废
【国别】:德国
【发布日期】:1977-12
【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】:二氯甲烷;抽样方法;革皮;试验;仪器
【英文主题词】:testing;instruments;leather;samplingmethods;methylenedichloride
【摘要】:
【中国标准分类号】:Y45
【国际标准分类号】:6360
【页数】:2P;A4
【正文语种】:德语