短路电流-外文文献翻译

《短路电流-外文文献翻译》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、徐州师范大学电气工程及自动化学院外文参考文献及翻译姓名:院系：电气工程及自动化学院专业：电气工程及其自动化班级：Short-circuitcurrent1TermsandDefinitionsThefollowingtermsanddefinitionscorrespondlargelytothosedefinedinIEC60909.Refertothisstandardforalltermsnotusedinthisbook.Thetermsshortcircuitandgroundfault

2、describefaultsintheisolationofoperationalequipmentwhichoccurwhenlivepartsareshuntedoutasaresult.lCauses:1.Overtemperaturesduetoexcessivelyhighovercurrents.2.Disruptivedischargesduetoovervoltages.3.Arcingduetomoisturetogetherwithimpureair,especiallyoni

3、nsulators.lEffects:1.Interruptionofpowersupply.2.Destructionofsystemcomponents.3.Developmentofunacceptablemechanicalandthermalstressesinelectricaloperationalequipment.lShortcircuit:AccordingtoIEC60909,ashortcircuitistheaccidentalorintentionalconductiv

4、econnectionthrougharelativelylowresistanceorimpedancebetweentwoormorepointsofacircuitwhicharenormallyatdifferentpotentials.lShortcircuitcurrent:AccordingtoIEC60909,ashortcircuitcurrentresultsfromashortcircuitinanelectricalnetwork.Itisnecessarytodiffer

5、entiateherebetweentheshortcircuitcurrentatthepositionoftheshortcircuitandthetransferredshortcircuitcurrentsinthenetworkbranches.lInitialsymmetricalshortcircuitcurrent:Thisistheeffectivevalueofthesymmetricalshortcircuitcurrentatthemomentatwhichtheshort

6、circuitarises,whentheshortcircuitimpedancehasitsvaluefromthetimezero.lInitialsymmetricalshortcircuitapparentpower:Theshortcircuitpowerrepresentsafictitiousparameter.Duringtheplanningofnetworks,theshortcircuitpowerisasuitablecharacteristicnumber.lPeaks

7、hortcircuitcurrent:Thelargestpossiblemomentaryvalueoftheshortcircuitoccurring.lSteadystateshortcircuitcurrent:Effectivevalueoftheinitialsymmetricalshortcircuitcurrentremainingafterthedecayofalltransientphenomena.lDCaperiodiccomponent:Averagevalueofthe

8、upperandlowerenvelopecurveoftheshortcircuitcurrent,whichslowlydecaystozero.lSymmetricalbreakingcurrent:Effectivevalueoftheshortcircuitcurrentwhichflowsthroughthecontactswitchatthetimeofthefirstcontactseparation.lEquivalentvoltagesource:Thevolt