毕业设计论文 外文文献翻译 基于plc双电源开关设计外文翻译 中英文对照

毕业设计（外文翻译）英文题目BASEDONPLCDUALPOWERSWITCHDESIGN中文题目基于PLC双电源开关设计系（院）自动化系专业电气自动化技术INTELLIGENTDOUBLEPOWER1INTELLIGENTDUALPOWERSUPPLYSWITCHINGTECHNOLOGYINTHISPAPER,THEDOUBLELOADDUALPOWERAUTOMATICSWITCHINGOFPLCCONTROL,PLCCONTROLPROGRAMTOREPLACERELAYLOGICCONTROLCIRCUITS,ITHASTHETHREEPHASEPOWERSUPPLYPHASEDETECTIONANDPROTECTIONSWITCHINGFUNCTION,POWERRETURNEDTONORMALAFTERTHEAUTOMATICREVERSESWITCH,WHENAFAULTANDRESTORENORMALRESPECTIVELYSENDSOUTTWODIFFERENCECLEARALARMANDPROMPTSOUNDDOUBLELOADDUALPOWERAUTOMATICSWITCHINGCONTROLOFPLC,THEOPENPHASEPROTECTIONMAINLYADOPTSTHETECHNICALPROPOSALTHATSETTINGTHETHREEPHASEOPENPHASEDETECTIONSIGNALCIRCUIT,THETHREEPHASEOPENPHASEDETECTIONSIGNALCIRCUITDIRECTLYFROMTHEMAINCIRCUITOFTHREEPHASEPOWERSUPPLY,NAMELYTHEINTERMEDIATERELAYKA1KA3ANDKA4KA6,RESPECTIVELYCONNECTEDTOPOWERSUPPLYMAINLOOPU1ANDU2A,BANDCSINGLEPHASECIRCUIT,KA1KA3ANDKA4KA6NORMALLYOPENCONTACTSRESPECTIVELYASPLCINPUTSIGNAL,NAMELYASTHEPREPARATIONOFPLCU1ANDU2THREEPHASEOPENPHASEDETECTIONLOGICCONTROLPROGRAMINPUTCONDITIONSWITHSHORTPHASEPROTECTIONDOUBLELOADDUALPOWERAUTOMATICSWITCHINGCONTROL,NOTONLYHASTHEOPENPHASEPROTECTION,BUTALSOHASASHORTCIRCUITANDOVERLOADPROTECTION,UNDERVOLTAGEPROTECTIONFUNCTIONAUTOMATICPHASELACKDETECTION,THREEPHASECURRENTDISPLAY,AROADPOWERSUPPLYCIRCUITCANAUTOMATICALLYSWITCHTOANOTHERPOWERSOURCETOLOADPOWERSUPPLY,LIGHTANDSOUNDALARMINTHEPOWERSUPPLYRETURNTONORMALAFTERAUTOMATICREVERSESWITCHINTHEEVENTOFAFAILUREANDRETURNTONORMALWHENRESPECTIVELYSENDSOUTTWODIFFERENCEOBVIOUSALARMANDPROMPTSOUNDEFFECTSITOVERCOMESTHESHORTCOMINGSOFLOWDOUBLEPOWERSUPPLYSWITCHINGCONTROLSYSTEMWITHOUTPHASEPROTECTION,CANAUTOMATICALLYREVERSESWITCH,ASWELLASFAULTANDRETURNTONORMALWHENUSINGASINGLEAUDIOPROMPTSDEFECTSTHECONTROLSYSTEMHASPERFECTFUNCTION,RELIABLEPERFORMANCE,SIMPLECIRCUITSTRUCTURE,LOWMANUFACTURINGCOSTETC2INTELLIGENTDUALPOWERSUPPLIESSWITCHINGMAINCIRCUITCONTROLWITHSHORTPHASEPROTECTIONDOUBLELOADDUALPOWERAUTOMATICSWITCHINGCONTROLCIRCUITITINCLUDESAMAINCIRCUITANDTHREEPHASESHORTSIGNALDETECTINGSAMPLINGCIRCUITTHEMAINCIRCUITOFTHEINPUTPOWERSUPPLYPOWERSUPPLYU1ANDU2,ITSOUTPUTHASTWOLOADSW1ANDW2POWERMAINCIRCUITOFACCONTACTORU1THROUGHKM1MAINCONTACTSANDALOADOFW1CONNECTEDPOWERSUPPLYU2MAINCIRCUITTHROUGHTHEACCONTACTORKM2MAINCONTACTSANDALOADOFW2CONNECTEDUNDERTHECONTROLOFACONTROLCIRCUIT,APOWERFAILUREOCCURS,THEACCONTACTORLOSTTHEFIRSTELECTRICALLYDISCONNECTED,SOTHATTHELOADOFDETACHMENTFAULTSPOWERSUPPLYCIRCUIT,THEACCONTACTORKM3MAINCONTACTCLOSINGCONDUCTIONCONTACTLOOP,WILLBECONNECTEDTOTHEFAULTLOOPLOADSWITCHAUTOMATICALLYTOANOTHERNORMALPOWERSUPPLYCONTINUESTOSUPPLYPOWERSUPPLYU1ANDU2MAINCIRCUITINPUTENDOFTHEAUTOMATICSWITCHINQF1ANDQF2ISTHEPRIMARYROLEOFOVERLOADPROTECTIONANDSHORTCIRCUITPROTECTIONTWOPHASEPOWERSUPPLYMAINLOOPINEACHPHASEARECURRENTMETERTOINDICATETHEPHASECURRENTSTATUS,WITHTHECONTROLCIRCUITOFPHASELACKDETECTIONTHETHREEPHASEOPENPHASEDETECTIONSIGNALSAMPLINGCIRCUIT,THEPHASEDETECTIONSIGNALDIRECTLYFROMTHEMAINCIRCUITOFTHREEPHASEPOWERSUPPLY,NAMELYTHEINTERMEDIATERELAYKA1KA3KA4KA6ARERESPECTIVELYCONNECTEDTOTHEPOWERSUPPLYMAINLOOPU1ANDU2A,BPHASEANDCPHASEOFTHESINGLEPHASECIRCUIT,KA1KA3ANDKA4KA6NORMALLYOPENCONTACTASU1ANDU2THREEPHASEOPENPHASEDETECTIONSWITCHSAMPLINGSIGNAL,TOTHEPLCINPUTTERMINALCONSIDERINGTHEPLCRELAYOUTPUTPOINTLOADCAPACITY,THROUGHTHECONTACTORKM01KM03TODRIVEHIGHCURRENTCONTACTORKM1KM3FORTHREEPHASEPOWERU1A,BPHASEANDCPHASELACKDETECTION,THEUSEOFANINTERMEDIATERELAYKA1,KA2ANDKA3,RESPECTIVELYCONNECTEDTOPOWERTHEU1MAINCIRCUITA,BPHASEANDCPHASEANDZEROLINENCONSTITUTEASINGLEPHASECIRCUIT,THEFORMATIONOFA1,B1ANDC1PHASEDETECTIONCIRCUITTHENORMALLYOPENCONTACTOFKA1KA3ASU1THREEPHASEPHASELACKDETECTIONSWITCHSAMPLINGSIGNAL,TOTHEPLCINPUTTERMINAL,USEDINTHEPREPARATIONOFPLCU1THREEPHASEOPENPHASEDETECTIONLOGICCONTROLPROGRAMINPUTCONDITIONSSIMILARLY,THETHREEPHASEPOWERSUPPLYU2A,BPHASEANDCPHASELACKDETECTION,BUTALSOTHEUSEOFANINTERMEDIATERELAYKA4,KA5ANDKA6,RESPECTIVELYCONNECTEDTOPOWERTHEU2MAINCIRCUITA2,B2PHASEANDC2PHASEANDZEROLINENCONSTITUTEASINGLEPHASECIRCUIT,THEFORMATIONOFA2,B2ANDC2THREEPHASEOPENPHASEDETECTIONCIRCUITKA4KA6NORMALLYOPENCONTACTSRESPECTIVELYASU2THREEPHASEOPENPHASEDETECTIONSWITCHSAMPLINGSIGNAL,TOTHEPLCINPUTTERMINAL,USEDINTHEPREPARATIONOFPLCU2THREEPHASEOPENPHASEDETECTIONLOGICCONTROLPROGRAMINPUTCONDITIONS3WITHPLCINTELLIGENTDUALPOWERCONTROLTHETHREEPHASEOPENPHASEDETECTIONSIGNALSAMPLINGCIRCUIT,ASU1ANDU2THREEPHASEOPENPHASEDETECTIONSWITCHSAMPLINGSIGNALSOFKA1KA3ANDKA4KA6,THENORMALLYOPENCONTACTSRESPECTIVELYFORTHEINPUTOFTHEPLCX0X2,X3X5INTHEPLCLADDERDIAGRAMPROGRAM,AUXILIARYRELAYR1ASTHETHREEPHASEPOWERSUPPLYOFU1THREEPHASEOPENPHASEDETECTION,WHICHISNORMALLYOPENINPUTCONDITIONSFORX0,X1ANDX2“AND“LOGICSIMILARLY,INTERNALINTERMEDIATERELAYR2ASTHETHREEPHASEPOWERSUPPLYOFU2THREEPHASEOPENPHASEDETECTION,ITSONCONDITIONSFORTHENORMALLYOPENINPUTX3,X4ANDX5“AND“LOGICINAUTOMATICSWITCHINGCONTROLPROCESS,PLCLADDERDIAGRAMPROCEDUREOFAUXILIARYRELAYR1ANDR2RESPECTIVELYCONTROLLEDACCONTACTORKM1Y0ANDKM2Y1COILANDELECTRICSTATE,DIRECTLYREFLECTSTWOTHREEPHASEPOWERSUPPLYU1ANDU2RESPECTIVELYTHETOTALPHASECONDITION,NAMELY,EITHERU1ORU2THREEPHASEPOWERSUPPLYPHASE,KM1Y0ORKM2Y1WILLIMMEDIATELYLOSESELECTRICITY,THENORMALLYCLOSEDCONTACTOFTHEALTERNATINGCURRENTCONTACTORCLOSEDKM3Y2CONTROLCOILGETSELECTRICITYTOATTRACT,THROUGHTHEKM3MAINCONTACTSCLOSEDCONDUCTIONCONTACTLOOP,WILLBECONNECTEDTOTHEFAULTCIRCUITLOADW1ORW2AUTOMATICALLYSWITCHESTOANORMALPOWERSUPPLYU2ORU1TOPOWERSUPPLY,SOASTOREALIZEOPENPHASEPROTECTIONAUTOMATICSWITCHINGINAUTOMATICSWITCHINGCONTROLPROCESS,AUXILIARYRELAYR1ANDR2MAINFUNCTIONISWHENTROUBLESHOOTING,THREEPHASEPOWERU1ORU2RECOVERTHENORMALPOWERSUPPLY,R1ORR2HAVEELECTRICITY,THENORMALLYCLOSEDCONTACTACTION,R3RESET,CUTKM3Y2,THENKM1Y0ORKM1Y1COMPLEXHAVEELECTRICITY,THEREBYAUTOMATICALLYREVERSESWITCHINGBACKTOTHEPOWERSUPPLYTOLOADW1U1,U2W2POWERSUPPLYTOLOADTHENORMALPOWERSUPPLYSTATETHECONTROLCIRCUITADOPTSELECTRICWHISTLEORBUZZERASANALARMSOUNDATTHESAMETIMEWITHTHEREDSIGNALATTHESAMETIMEWITHTHEREDSIGNALLAMP,ANDRETURNEDTONORMALWHENTHEBELLHAASPROMPTSOUNDCANPRODUCETWODISTINCTALARMSANDPROMPTSOUNDEFFECTS智能双电源1智能双电源切换的技术方案本文所述的双负载双电源自动切换的PLC控制,用PLC控制程序取代继电器逻辑控制电路,其具有对三相供电电源的缺相检测及保护切换功能,在电源恢复正常后能自动进行反切换,当发生故障和恢复正常时能分别发出两种区别明显的报警和提示音响。双负载双电源自动切换的PLC控制,其缺相保护主要采取的技术方案是设置有三相缺相检测信号回路,该三相缺相检测信号回路直接取自于三相电源的主回路,即用中间继电器KA1KA3和KA4KA6,分别接于电源主回路U1和U2的A相、B相和C相单相回路中,KA1KA3和KA4KA6的常开触点分别作为PLC的输入信号,即作为编制PLC的U1和U2三相缺相检测逻辑控制程序时的输入条件。具有缺相保护的双负载双电源自动切换控制,不仅具有缺相保护,同时还具有短路和过载保护、失压保护等功能能自动进行缺相检测、三相电流显示,某一路供电电源发生故障时能自动切换到另一路电源继续对负载供电,并发出声光报警在电源恢复正常后能自动进行反切换在发生故障和恢复正常时能分别发出两种区别明显的报警和提示音响效果。它克服了现有中低档双电源切换控制系统的没有缺相保护,不能自动进行反切换，以及故障和恢复正常时使用单一的音响提示等缺陷。本控制系统具有功能完备、性能可靠、电路构造简单、制造成本低廉等特点。2智能双电源切换的主电路控制具有缺相保护的双负载双电源自动切换控制电路。其中包括主回路和三相缺相检测采样信号回路。主回路的输入有两路供电电源U1和U2,其输出有两路负载W1和W2。电源U1主回路通过交流接触器KM1的主触点闭合与其负载W1相联接电源U2主回路通过交流接触器KM2的主触点闭合与其负载W2相联接在控制电路的控制下,某一电源发生故障时,其交流接触器先失电断开,使其负载脱离故障电源回路,通过交流接触器KM3的主触点闭合导通联络回路,将接于故障回路的负载自动切换到另一正常电源继续供电。电源U1和U2主回路输入端的自动开关QF1和QF2的主要作用是过载保护及短路保护两路三相电源的主回路中每一相均有电流表指示各相电流的状况,以配合控制电路的缺相检测。三相缺相检测采样信号回路,其缺相检测信号直接取自于三相电源的主回路,即用中间继电器KA1KA3KA4KA6分别接于电源主回路U1和U2的A相、B相和C相的单相回路中,KA1KA3和KA4KA6的常开触点分别作为U1和U2的三相缺相检测的开关量采样信号,作用于PLC的输入端。考虑到PLC继电器输出点的负载能力,通过接触器KM01KM03来驱动大电流接触器KM1KM3。对于三相电源U1的A相、B相和C相的缺相检测,各采用一个中间继电器KA1、KA2和KA3,分别接于电源U1主回路的A相、B相和C相并与零线N构成的单相回路,形成A1、B1和C1三相的缺相检测回路。KA1KA3的常开触点分别作为U1的三相缺相检测的开关量采样信号,作用于PLC的输入端,作为编制PLC的U1三相缺相检测逻辑控制程序时的输入条件同理,对于三相