IEC/TR 60909-4-2000 三相交流系统中的短路电流第4部分:短路电流计算举例

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【英文标准名称】:Short-circuitcurrentsinthree-phasea.c.systems-Part4:Examplesforthecalculationofshort-circuitcurrents
【原文标准名称】:三相交流系统中的短路电流第4部分:短路电流计算举例
【标准号】:IEC/TR60909-4-2000
【标准状态】:现行
【国别】:国际
【发布日期】:2000-07
【实施或试行日期】:
【发布单位】:国际电工委员会(IEC)
【起草单位】:IEC/TC73
【标准类型】:()
【标准水平】:()
【中文主题词】:效应;电气工程;短路电流;三相电流;电流;交流电流;数学计算
【英文主题词】:
【摘要】:ThispartofIEC60909isatechnicalreportintendedtogivehelpfortheapplicationofIEC60909-0forthecalculationofshort-circuitcurrentsin50Hzor60Hzthree-phasea.c.systems.Thistechnicalreportdoesnotincludeadditionalrequirementsbutgivessupportforthemodellingofelectricalequipmentinthepositive-sequence,thenegative-sequenceandthezero-sequencesystem(clause2)andthepracticalexecutionofcalculationsinalow-voltagesystem(clause3),amedium-voltagesystemwithasynchronousmotors(clause4)andapower-stationunitwithitsauxiliarynetworkfeedingalargenumberofmedium-voltageasynchronousmotorsandlow-voltagemotorgroups(clause5).Thethreeexamplesgiveninclauses3,4and5aresimilartothosegiveninIEC60909(1988)buttheyarerevisedinaccordancewithIEC60909-0,whichreplacesit.Asubclauseisaddedtotheexampleinclause3togiveacomparisonbetweentheresultsfoundwiththeapplicationoftheequivalentvoltagesourceattheshort-circuitlocationfollowingtheproceduregiveninIEC60909-0ontheonehand,andresultsfoundwiththesuperpositionmethodontheotherhand,takingintoaccountdifferentload-flowconditionsbeforetheshortcircuit.Clause6ofthistechnicalreportgivesthecircuitdiagramandthedataofatestnetworkandtheresultsforacalculationcarriedoutinaccordancewithIEC60909-0,toofferthepossibilityforacomparisonbetweentheresultsfoundwithadigitalprogramforthecalculationofshort-circuitcurrentsandthegivenresultsforIk",ip,Ib,Ik,Ik1"andip1inahigh-voltagenetworkwithpower-stationunits,generators,asynchronousmotorsandlinesinfourdifferentvoltagelevels380kV,110kV,30kVand10kV.
【中国标准分类号】:K04
【国际标准分类号】:17_220_01
【页数】:131P;A4
【正文语种】:英语


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【英文标准名称】:StandardSpecificationforReinforcedConcreteCulvert,StormDrain,andSewerPipe(Metric)
【原文标准名称】:钢筋混凝土制下水道、雨水管和污水管的标准规范(米制)
【标准号】:ASTMC76M-2010a
【标准状态】:现行
【国别】:
【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】:C13.02
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:圆管;管道;D-荷载;管;加筋混凝土;污水管;雨水道;混凝管(加筋)规范;下水道(混凝土)规范;接头(混凝土设备)规范;污水管(混凝土)规范;雨水道/污水混凝管规范
【英文主题词】:circularpipe;culvert;D-load;pipe;reinforcedconcrete;sewerpipe;stormdrain;Concretepipe(reinforced)--specifications;Culvertpipe(concrete)--specifications;Joints(concreteapplications)--specifications;Sewerpipe(concrete)--specifica
【摘要】:1.1Thisspecificationcoversreinforcedconcretepipeintendedtobeusedfortheconveyanceofsewage,industrialwastes,andstormwater,andfortheconstructionofculverts.1.2ThisspecificationistheSIcompaniontoSpecificationC76.Note18212;Thisspecificationisamanufacturingandpurchasespecificationonly,anddoesnotincluderequirementsforbedding,backfill,ortherelationshipbetweenfieldloadconditionandthestrengthclassificationofpipe.However,experiencehasshownthatthesuccessfulperformanceofthisproductdependsupontheproperselectionoftheclassofpipe,typeofbeddingandbackfill,controlledmanufactureintheplant,andcareandinstallationconformstotheconstructionspecifications.Theownerofthereinforcedconcretepipespecifiedhereiniscautionedthathemustcorrelatethefieldrequirementswiththeclassofpipespecifiedandprovideinspectionattheconstructionsite.Note28212;AttentioniscalledtothespecificationforreinforcedconcreteD-loadculvert,stormdrain,andsewerpipe(ASTMDesignationC655M).
【中国标准分类号】:Q81
【国际标准分类号】:
【页数】:11P.;A4
【正文语种】:


【英文标准名称】:StandardPracticeforHosedownofaMembraneSwitch
【原文标准名称】:薄膜开关软管洗涤的标准实施规程
【标准号】:ASTMF2072-2001(2007)
【标准状态】:现行
【国别】:
【发布日期】:2001
【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】:F01.18
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:hosedown;membraneswitch;waterspray
【摘要】:Thepresenceofwaterinsideamembraneswitchcanaffectitsmechanicaloperationorelectricalfunctionality,orboth.Thispracticeestablishesaproceduretoverifytheabilityofamembraneswitchtoresisttheentryofliquidintoitselforafinishedproduct,orboth.Itisusefulinidentifyingdesigndeficiencies.Hosedowntestingmaybedestructive,thereforeanysamplestestedshouldbeconsideredunfitforfutureuse.1.1Thispracticeestablishesproceduresforthehosedownofamembraneswitchtoverifyadequateprotectionfromingressofwaterfromahigh-volumewaterspray.1.2Thispracticecanalsobeusedtoverifytheabilityofamembraneswitchorgraphicslayertoactasaliquidsealforafinishedproduct.1.3Additionaltestmethodsorpracticescanbeincorporatedtoinvestigatespecificresultsorcapabilities.1.4ThispracticeisamodificationofNEMAPublicationNumber250-1991Section6.7whichisatestforhosedownofafinishedproducthousing.
【中国标准分类号】:J04
【国际标准分类号】:31_220_20
【页数】:2P.;A4
【正文语种】: