【英文标准名称】:Short-circuitcurrentsinthree-phasea.c.systems-Part3:Currentsduringtwoseparatesimultaneousline-to-earthshortcircuitsandpartialshort-circuitcurrentsflowingthroughearth
【原文标准名称】:三相交流系统中的短路电流.第3部分:两个独立的同时对地短路、部分短路电流流入大地情况下的电流
【标准号】:IEC60909-3-2003
【标准状态】:作废
【国别】:国际
【发布日期】:2003-09
【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/TC73
【标准类型】:()
【标准水平】:()
【中文主题词】:双线对地短路;线路对地短路;单相电路;电气设备;定义;数学计算;电气工程;短路电流;短路阻抗;短路
【英文主题词】:Definition;Definitions;Doubleline-to-earthshort-circuits;Electricpowernetworks;Electricalengineering;Electricalequipment;Faultcurrents;Highvoltage;Line-to-earthshort-circuits;Lowvoltage;Mathematicalcalculations;Multilingual;Shortcircuitimpedance;Shortcircuits;Short-circuitcurrents;Single-phasecircuits;Symbols;Three-phasecurrent;Three-phasenetworks
【摘要】:ThispartofIEC60909specifiesproceduresforcalculationoftheprospectiveshort-circuit.currentswithanunbalancedshortcircuitinhigh-voltagethree-phaseACsystemsoperatingatnominalfrequency50Hzor60Hz,i.e.a)currentsduringtwoseparatesimultaneousline-to-earthshortcircuitsinisolatedneutralorresonantearthedneutralsystems;b)partialshort-circuitcurrentsflowingthroughearthincaseofsingleline-to-earthshortcircuitinsolidlyearthedorlow-impedanceearthedneutralsystems.Thecurrentscalculatedbytheseproceduresareusedwhendetermininginducedvoltagesortouchorstepvoltagesandriseofearthpotentialatastation(powerstationorsubstation).Thisstandarddoesnotcover:a)short-circuitcurrentsdeliberatelycreatedundercontrolledconditionsasinshort-circuittestingstations,orb)short-circuitcurrentsintheelectricalinstallationsonboardshipsoraeroplanes,orc)singleline-to-earthfaultsinisolatedorresonantearthedsystems.Theobjectofthisstandardistoestablishpracticalandconciseproceduresforthecalculationofline-to-earthshort-circuitcurrentsduringtwoseparatesimultaneousline-to-earthshortcircuitsandpartialshort-circuitcurrentsthroughearthfromelectricalinstallations,leadingtoconservativeresultswithsufficientaccuracy.Forthispurpose,thecurrentisdeterminedbyconsideringanequivalentvoltagesourceappliedattheshort-circuitlocationwithallothersourcessettozero.Theprocedureissuitablefordeterminationbymanualmethodsordigitalcomputation.ThisstandardisanadditiontoIEC60909-0.Generaldefinitions,symbolsandcalculationassumptionsrefertothatpublication.Specialitemsonlyaredefinedorspecifiedinthisdocument.Thisdoesnotexcludetheuseofspecialmethods,forexamplethesuperpositionmethod,adjustedtoparticularcircumstances,iftheygiveatleastthesameprecision.AsstatedinIEC60909-0,short-circuitcurrentsandtheirparametersmayalsobedeterminedbysystemtests.Thecalculationoftheshort-circuitparametersbasedontherateddataoftheelectricalequipmentandthetopologicalarrangementofthesystemhastheadvantageofbeingpossiblebothforexistingsystemsandforsystemsattheplanningstage.
【中国标准分类号】:K04
【国际标准分类号】:17_220_01
【页数】:72P;A4
【正文语种】:英语


Product Code:SAE AIR1934
Title:Use of Structural Carbon Heat Sink Brakes on Aircraft
Issuing Committee:A-5a Wheels, Brakes And Skid Controls Committee
Scope: The purpose of this document is to relate areas where carbon brake technology may differ from traditional steel brake technology in design and performance. Carbon brakes have been used on military aircraft for many years and are now frequently used on newly commercial developed aircraft. This document presents some of the lessons learned.