IEC 60947-4-2 Edition 2.2-2007 低压开关设备和控制设备.第4-2部分:电流接触器和电动机起动器.交流半导体电动机控制器和起动器

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【英文标准名称】:Low-voltageswitchgearandcontrolgear-Part4-2:Contactorsandmotor-starters-ACsemiconductormotorcontrollersandstarters
【原文标准名称】:低压开关设备和控制设备.第4-2部分:电流接触器和电动机起动器.交流半导体电动机控制器和起动器
【标准号】:IEC60947-4-2Edition2.2-2007
【标准状态】:作废
【国别】:国际
【发布日期】:2007-02
【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/SC17B
【标准类型】:()
【标准水平】:()
【中文主题词】:交流电压;断路器;接触器;电动机接触器(开关);控制装置;控制器;定义;电气工程;检验;低电压;低压设备;低压开关设备;电动机起动器;特性;半导体接触器;半导体器件;半导体工程;半导体;短路保护;电晶体闸流管;规范(验收);起动器;开关设备;试验
【英文主题词】:Alternatingvoltages;Circuit-breakers;Contactors;Contactorsformotors;Controldevices;Controllers;Definition;Definitions;Electricalengineering;Inspection;Lowvoltage;Low-voltageequipment;Low-voltageswitchgear;Motorstarters;Properties;Semiconductorcontactors;Semiconductordevices;Semiconductorengineering;Semiconductors;Short-circuitprotection;Solid-statethyratrons;Specification(approval);Starters;Switchgear;Testing
【摘要】:Thisstandardappliestocontrollersandstarters,whichmayincludeaseriesmechanicalswitchingdevice,intendedtobeconnectedtocircuits,theratedvoltageofwhichdoesnotexceed1000Va.c.Thisstandardcharacterizescontrollersandstarterswithandwithoutbypassmeans.Controllersandstartersdealtwithinthisstandardarenotnormallydesignedtointerruptshort-circuitcurrents.Therefore,suitableshort-circuitprotection(see8.2.5)shouldformpartoftheinstallation,butnotnecessarilyofthecontrollerorstarter.Inthiscontext,thisstandardgivesrequirementsforcontrollersandstartersassociatedwithseparateshort-circuitprotectivedevices.Thisstandarddoesnotapplyto:–continuousoperationofa.c.motorsatmotorspeedsotherthanthenormalspeed;–semiconductorequipment,includingsemiconductorcontactors(see2.2.13ofIEC60947-1)controllingnon-motorloads;–electronica.c.powercontrollerscoveredbyIEC60146.Contactors,overloadrelaysandcontrolcircuitdevicesusedincontrollersandstartersshouldcomplywiththerequirementsoftheirrelevantproductstandard.Wheremechanicalswitchingdevicesareused,theyshouldmeettherequirementsoftheirownIECproductstandard,andtheadditionalrequirementsofthisstandard.Theobjectofthisstandardistostateasfollows:–thecharacteristicsofcontrollersandstartersandassociatedequipment;–theconditionswithwhichcontrollersandstartersshallcomplywithreferenceto:a)theiroperationandbehaviour;b)theirdielectricproperties;c)thedegreesofprotectionprovidedbytheirenclosureswhereapplicable;d)theirconstruction;–thetestsintendedforconfirmingthattheseconditionshavebeenmet,andthemethodstobeadoptedforthesetests;–theinformationtobegivenwiththeequipment,orinthemanufacturer'sliterature.
【中国标准分类号】:K30;K32
【国际标准分类号】:29_130_20
【页数】:195P.;A4
【正文语种】:英语


基本信息
标准名称:铁路明线12路载波电话设备
中标分类: 铁路 >> 铁路通信 >> 铁路通信设备
发布日期:
实施日期:1992-11-01
首发日期:
作废日期:
出版日期:
页数:8页
适用范围

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前言

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目录

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引用标准

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所属分类: 铁路 铁路通信 铁路通信设备
【英文标准名称】:StandardTestMethodforWaterVaporContentofGaseousFuelsUsingElectronicMoistureAnalyzers
【原文标准名称】:使用电子湿度分析仪测定气体燃料中水蒸气含量的标准试验方法
【标准号】:ASTMD5454-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【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】:D03.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:气体燃料;含水量
【英文主题词】:
【摘要】:Watercontentinfuelgasisthemajorfactorinfluencinginternalcorrosion.Hydrates,asemisolidcombinationofhydrocarbonsandwater,willformundertheproperconditionscausingseriousoperatingproblems.Fuelheatingvalueisreducedbywaterconcentration.Waterconcentrationlevelsarethereforefrequentlymeasuredinnaturalgassystems.Acommonpipelinespecificationis4to7lb/MMSCF.Thistestmethoddescribesmeasurementofwatervaporcontentwithdirectreadoutelectronicinstrumentation.1.1Thistestmethodcoversthedeterminationofthewatervaporcontentofgaseousfuelsbytheuseofelectronicmoistureanalyzers.Suchanalyzerscommonlyusesensingcellsbasedonphosphoruspentoxide,P2O5,aluminumoxide,Al2O3,orsiliconsensorspiezoelectric-typecellsandlaserbasedtechnologies.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:E31
【国际标准分类号】:75_160_30
【页数】:3P.;A4
【正文语种】: