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1、2013年初级电工证考试试题（Testpaperforprimaryelectriciancertificatein2013）Testpaperforprimaryelectriciancertificatein2013First,nouninterpretation:1,three-phasealternatingcurrent:thepowersystemcomposedofthreeACcircuitswiththesamefrequency,thesameamplitudeofelectricpotentialandthephase
2、differenceof120degreesangleiscalledthree-phasealternatingcurrent.2,adirectproductionofelectricityandequipmentrelatedtopowertransmissionanddistributionequipmentcalledadevice.Itincludesallkindsofhighvoltagecircuitbreaker,disconnectingswitch,bus,powercable,voltagetransformer,
3、currenttransformer,reactor,lightningarrester,arcsuppressioncoil,shuntcapacitorandhighvoltagefuse.3andtwoequipment:auxiliaryequipmentformonitoring,measuring,manipulation,controlandprotectionofprimaryequipment.Suchasvariousrelays,signaldevices,measuringinstruments,recordingr
4、ecordingdevicesandtelemetry,remotesignaldevicesandavarietyofcontrolcables,smallbuses,etc..4,highvoltagecircuitbreakerandhigh-voltageswitch,itcannotonlycutofftheloadcurrentandloadcurrenthighvoltagecircuitorclosed,andwhenafaultoccurs,theeffectoftherelayprotectiondevice,cutof
5、ftheoverloadcurrentandshort-circuitcurrent.Ithasthearcstructureandsufficientflowcapacityisrelativelyperfect.5、loadswitch:thestructureoftheloadswitchissimilartothesecretisolatingswitch,butonlyasimplearcextinguishingdeviceisinstalled.Italsohasanobviousdisconnectionpoint,whic
6、hhasacertainbreakingcapacity,canoperatewithload,butcannotdirectlydisconnecttheshortcircuitcurrent,ifnecessary,relyonthehighvoltagefuseconnectedwithittoachieve.6,aircircuitbreaker(automaticswitch)isamanual:(orelectric)closing,keepclosingpositionforlocking,lowvoltageswitchtr
7、ippingmechanismbyactingonthetripandhasanarcextinguishingdevice,iswidelyusedinACandDCdeviceinthe500Vbelow,whenthecircuitoverload,shortcircuit,voltagedropordisappear,canautomaticallycutoffthecircuit.7,cable:thecorewire(conductivepart),plusinsulationlayerandprotectivelayeroft
8、hreepartsofthewirecalledcable.8,bus:busisacollectionofequipmentandelectricalpathdistribut
