JB/T 7658.14-1995 氨制冷装置用氨液分离器
作者:标准资料网 时间:2024-05-24 22:12:07 浏览:9090
来源:标准资料网
基本信息
| 标准名称： | 氨制冷装置用氨液分离器 |
| 中标分类： |
机械 >>
通用机械与设备 >>
制冷设备 |
| 替代情况： | 替代JB 456-86;JB 4337-86;被JB/T 7658.14-2006代替 |
| 发布部门： | 合肥通用机械研究所 |
| 发布日期： | 1995-06-16 |
| 实施日期： | 1996-07-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2007-04-01 |
| 归口单位： | 合肥通用机械研究所 |
| 出版社： | 机械工业出版社 |
| 出版日期： | 1996-07-01 |
| 页数： | 5 页 |
| 批文号： | 机械科[1995]496号 |
适用范围
本标准代替了JB 456-86和JB 4337-86二项标准。 本标准规定了氨制冷装置用氨液分离器的术语、产品分类、技术要求、试验方法、检验规则、标志、包装和运输。 本标准适用于氨制冷装置用氨液分离器。
前言
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引用标准
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所属分类： 机械 通用机械与设备 制冷设备
【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
Product Code:SAE AS5587
Title:Clamp, Loop, Plain, Support, Aircraft
Issuing Committee:G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Scope:No scope available.
