【英文标准名称】:Luminaires-Part2-14:particularrequirements-Luminairesforcoldcathodetubulardischargelamps(neontubes)andsimilarequipment.
【原文标准名称】:灯具.第2-14部分:详细要求.冷阴极管放电灯(氖管)及类似设备用灯具
【标准号】:NFC71-014-2009
【标准状态】:现行
【国别】:法国
【发布日期】:2009-06-01
【实施或试行日期】:2009-06-06
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:阴极放电灯;尺寸规格;放电灯;电池;电灯;电气工程;荧光灯;照明工程;照明工程学;批注;灯;照明系统;灯具;氖;规范(验收);测试;测试要求;管式放电灯
【英文主题词】:Cathodelamps;Dimensions;Dischargelamps;Electriccells;Electriclamps;Electricalengineering;Fluorescentlamps;Illuminatingengineering;Illuminationengineering;Inscription;Lamps;Lightingsystems;Luminaires;Neon;Specification(approval);Testing;Testingrequirements;Tubulardischargelamps
【摘要】:
【中国标准分类号】:K72
【国际标准分类号】:29_140_40
【页数】:29P;A4
【正文语种】:其他
【英文标准名称】:Short-circuitcurrentsinthree-phasea.c.systems-Calculationofcurrents
【原文标准名称】:三相交流系统内短路电流.电流的计算
【标准号】:BSEN60909-0-2001
【标准状态】:现行
【国别】:英国
【发布日期】:2001-10-26
【实施或试行日期】:2001-10-26
【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】:电力设备;交流电流;故障电流;电流;三相电流;短路电流;低压设备;高压设备
【英文主题词】:Alternatingcurrent;Currents;Definition;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】:74P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 三硫化二锑化学分析方法 溴酸钾容量法测定锑 |
| 英文名称： | Chemical analysis of antimony trisulfide |
| 中标分类： |
冶金 >>
金属化学分析方法 >>
重金属极其合金分析方法 |
| ICS分类： |
冶金 >>
金属材料试验 >>
金属材料化学分析
|
| 替代情况： | 原标准号GB/T 3255.1-1982;被YS/T 239.1-2010代替 |
| 发布日期： | |
| 实施日期： | 1997-01-01 |
| 首发日期： | |
| 作废日期： | 2011-03-01 |
| 出版日期： | |
| 页数： | 2页 |
适用范围
没有内容
前言
没有内容
目录
没有内容
引用标准
没有内容
所属分类： 冶金 金属化学分析方法 重金属极其合金分析方法 冶金 金属材料试验 金属材料化学分析