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首页 电工面试试题

电工面试试题.doc

电工面试试题

郭观心
2017-10-06 0人阅读 举报 0 0 暂无简介

简介:本文档为《电工面试试题doc》,可适用于领域

电工面试试题howcantheelectricianperformsafeoperationinliveinspectionAnswer:()chargedworkersshouldwearlongsleevedshirtandtrousers,buttonedcuffs,nowearvests,shortsandslipperstoworkLiveworkmustbedonewithaninsulatedboot,asafetyhelmetandaninsulatinggloveStandontheinsulatingpadanduseaninsulatedhandleItisforbiddentousesteeltapemeasureorleathertapemeasurewithwire()thechargedoperationpersonnelmustbetrained,qualified,andproficientinpoweroperationtechnology,atthesametimeshouldhaveexperienceofoperationofthepracticeofpersonnelmonitoringCharged()intheworktoensurethatthehumanbodyandtheearthbetweenthehumanbodyandthesurroundinggroundbetweenthehumanbodyandothermetalconductor(includingthezeroline)Therewasgoodinsulationorappropriatesafedistance()duringtheoperation,thebodymustnotcontactwiresatthesametime,inordertoavoidelectricshockTothisend,asfaraspossibletheimplementationofsinglehandsinglelineoperation()thetimeofliveinspectionshouldnotbetoolong,soastoavoidaccidentscausedbyfatigue,lowvoltagelivelineoperationtopreventpersonalshock,whichmeasuresshouldbetakenAnswer:()asmuchaspossibleonthebody'scontactvoltage,clampedtothegroundpotentialTothisend,theelectricalequipmenthousinggrounding,protection,zero,electricalequipment,repeatedearthing,neutralground,highvoltagephaseseparationgroundoperation,etc,aretoeliminatethebodyafterthevoltagetowork()increasetheimpedanceofthebody'selectricshockcircuitsoastominimizethecurrentpassingthroughthehumanbodySuchastheuseofinsulationplatform,insulationpad,insulationgloves,etc,thesemeasurestoprotectthesafetyofpersonnelworkisveryeffective()topreventpersonalelectricshock,practicalandreliablemeasuresshallbeworkedoutandtakenaccordingtotheactualsituationoftheworkSuchassettingupspecialcare,wearinglongsleevedclothes,usinginsulationtools,wearingglovesandsoonTrytoavoiddirectcontactwiththelivepartsoftheequipmentwhyshouldthegroundwirebeinstalledbytwopeopleAnswer:installthegroundwire,intheimplementationofsafetymeasures,powerfailure,inspectionafterelectricity,inmanycasestooperateinthevicinityofliveequipmentNotonlytheinstallationofgroundingwire,groundingwireanddemolitionshouldalsocomplywiththeprovisionsofthehighvoltageequipmentwork,withtwopeople,inordertopreventunsupervisedandmisoperation,andseriousconsequencesofchargedwireaccidentwhennorescueTothisend,wemustcomplywiththerelevantprovisionsofthe"safetyregulations"Forthesinglestationsubstationsafetytechnicalmeasures,onlythroughtheoperatingmechanismgroundingisolationswitch,ortheuseofbasicsafetytoolsinsulationrodgroundingisolationswitchwhyshouldtheequipmentbedisconnectedfromtheiroperatingenergyAnswer:isolationcircuitbreakerswitchoff,iftheycontinuetoopenthecontrolpowersupplyandswitchingenergymaybeduetoavarietyofreasons,suchasthetestofprotection,remotecontroldevicedebuggingimproper,misoperation,circuitbreakerorisolatingswitchissuddenlyclosed,causingthechargedmaintenanceequipment,thedestructionofworksafetyInthisregard,the"safetyregulations"andonsiteoperatingproceduresarespecified,thecircuitbreakerwithdrawalorwithdrawalofstandby,thecircuitbreakeranddisconnectingswitchmustbedisconnectedfromtheoperationofenergyForexample:ontheelectricoperatingmechanism,shouldtaketheircontrol,closingfuse(insurance)oropentheclosingpowerknifeswitchtothehydraulicoperationmechanism,cancloseitsoilandgasvalveThepneumaticoperatingmechanismcanconnectthepneumaticcircuitwiththeairoperatedbythemanipulatorwhataretherulesthatmustbefollowedwhenthepowersupplysystemisclosedandthepowersupplyiscompletedAnswer:inordertopreventthedeliveryofpowertotheequipmentthathasnotfinishedworkandpreventthemalignantaccidentssuchastakingthegroundtoclose,itisstrictlystipulatedinthesixtyfourthregulationsthattheworkiscompletedandthepowerisswitchedonandoffaftertheworkisfinishedThecontentsoftheprovisionsoftheactuallearningwork,emphasisshouldbeemphasizedonthreeconditions:()beforethepowertransmission,mustallworkticketsystemverifiedtheblackoutalloverandhavebeenrecovered,theconclusionwascorrectbytheacceptanceofqualified,allhavechargedconditions()thepowersystemgroundingwirehavebeenremoved,checktheregressionlineframe,andaccordingtotheoperationconditionsofequipmenttorestorepermanentbarriers,accordingtotheprovisionsofhangingsigns()theswitchingpowersupplymustbecarriedoutaccordingtotheorderoftheheadoftheequipmentcontrolorthepersoninchargeofdutywhatisthepowerdistributionunitA:adistributiondeviceisageneraltermforelectricalequipmentthatcontrols,accepts,anddistributeselectricalenergyBecauseofitsfunctioniscomplete,sothedistributiondevicemusthaveavarietyoffunctionsofelectricalequipmentSuchasbus,circuitbreaker,isolationswitch,reactor,lightningarrester,voltagetransformer,capacitor,cableandmeasuringinstrument,suchastwoequipmentThedistributiondevicecanbedividedintoabussectionandaunitAccordingtothevoltagelevelandlayoutstructure,itcanbedividedintoindoororoutdoorpowerdistributiondeviceorvoltageclassdistributiondevicewhatiscalledanelectricalconnectionpartAnswer:anelectricalconnectionpartrefersto:obviouslysegmentedisolationswitchisarrangedbetweenaunitofelectricalpowerdistributionequipmentandotherelectricalparts,partmaintenanceoutagebetweentheisolationswitch,aslongasthecircuitbreakerisolatingswitchatthesideorsidewiththesafetymeasurestoberepaired,canguaranteesafeoperationForexample,thehighvoltagebusortransmissionline,whichcanbeclearlyseparatedfromeachendofthesystemwiththeisolatingswitch,canbecalledanelectricalconnectionpartwhataretherulesthatmustbeobservedintheworkofhighvoltageelectricalequipmentA:duetothestructuralandtechnicalcomplexityofhighvoltageelectricalequipment,theworkisverystrictonthequalityofmaintenanceElectricalmaintenancepersonnelinchargeofspecificenvironmentalthreats,thestrongelectricfieldofworksafetywillalwaysexistTherefore,inthehighvoltageelectricalequipmentforwork,theremustbeseriousdisciplinaryconstraints,strictorganizationofworkandadequateandreliabletechnicalmeasurestoensurethatTheregulationsthatmustbeobservedintheworkofhighvoltageelectricalequipmentareasfollows()executetheorderExecutiveordersincludewrittenworkorders,verbalandtelephoneordersThisisadisciplinethatcannotbearbitrarilyaltered()workingonahighvoltageelectricalapparatuswithminimumrequirementsforthenumberofpersonnelmustensurethatatleasttwopeopleworktogetherItspurposeistomeetthetaskoffulfillingthetask,butalsostrictlyfulfillthedutyofsecurityguardianship()organizationalmeasuresandtechnicalmeasuresforensuringthesafetyofstaffThisisthecorecontentoftheimplementationofelectricpowersafetyworkWhetheritisallpowerfailure,partialpowerfailureornopowerfailure,orwhenthepowersystemisnotoperatingnormally,thesafetymeasuresmustbefullyimplemented,EnsurethattheorganizationalmeasuresandtechnicalmeasuresareperfectandreliablewhatarethemaincausesofmisoperationAnswer:misoperationisthemostdangerousmanmadeaccidentcausedbyillegaloperationinelectricpowersafetyproductionItisofbadnatureandhasseriousconsequencesTherearethreemainreasonsforitsanalysis:()therearechapterswithoutcirculationSomeelectricalworkerssafetyconsciousness,theimplementationof"twovotes"(jobticketandticket),"three"(AC,successionsystem,equipmentsystem,regularinspectiontourequipmentregularlyswitchtestsystem)asamereformality,workconscientiously,notafraidoftrouble,knowingthattheiractionsareillegal,withnopsychology,switchingoperation,doesnotsimulatethetellers,don'tcare,someevenwithoutaticket,causedtheaccident()themisoperationpreventionlockingdevicehasitsownproblemsForexample,manyprogramsdesignedtolockitselfisnotperfect,notthe"fiveanti"(antimaloperation,circuitbreaker,loadcontrol,andisolatingswitch,antimistakenlychargedinterval,antistatichanginggroundingwire,groundingwireandcircuitbreakerwithantitransmissionpurposes,andevensomelock)onlythe"three"function,operationandmaintenanceandduetotheweakimplementationofthesafetymanagementsystem,sothatthelockisnotperfect,lostitsantimisoperationfunctionTherearealsoantimisoperationdevicesthathavepoorqualityofinstallationandmalfunction,andareoftenforcedtounlockandcauseconfusionTheoperatingpersonneloferrorpreventingdevicemanagementcan'tkeepupwiththerequirementsofthedevelopmentof"fourdonotunderstand","three"(ie,performance,structureandunderstandtheprincipleoflockingprocedures,installation,operationandmaintenance)()humanerrorForexample:noelectricityorelectricitywhendothingscarelesslychargedhangingground,causingpeopleoutofoperationandoperationmonitoringthewrongspacingandwrongequipment,notrepeatingthemistaketoacceptorderstoreflect,safetyeducationandsafetyresponsibilitysystem,sitemanagementproblemswhatarethemattersneedingattentionintheoperationofthecircuitbreakerAnswer:circuitbreakerswitchingorclosingisthetwomaincircuitoperationstepsOperationshouldpayattentiontothefollowingpoints()circuitbreakersplit:()beforeoperation,shouldfirstcheckandconsidertheprotectionandadaptationofthetwodeviceForexample,whethertheotherlinewillbeoverloadedaftertheparalleloperationofthelineisbroken,andwhetherthesettingvalueneedstobeadjustedornot()thecontrolhandleofthecircuitbreakeristwistedtotheswitchingposition,andthecircuitcurrentcontrolledbythebreakershallbereducedtozerowhentheswitchissplitataninstantThegreenlightison,andthepositionindicatorofthespotcheckmechanismisindicatedatthegateposition()circuitbreakerswitchon:()beforeclosingoperation,firstofall,tocheckthatthecircuitbreakeriscomplete(fromcoldstandby),enter(in)hotstandbystateTheutilitymodelcomprisesabreaker,bothsidesofthedisconnectingswitchareallingoodposition,andthemainandauxiliaryrelayprotectiondevicesofthecircuitbreakerareputintooperationaccordingtotheregulation,andtheenergyandtheoperationcontrolenergyareputintooperationThepositionsignaliscorrect()operatethecircuitbreakercontrolhandle,payattentiontotheexertion,andtakepropercontrolControlthehandletwisttotheclosingposition,observetheinstrumentindicationinstantaneousimpact(emptyshortlinewithoutthischange),waituntiltheredlightbeforeyoucanreturn,cannotreturntoofast,causethecircuitbreakertobetoolatetoswitchon()afteroperation,checktheclosingcurrentofthebreakerandreturntheammeterpointertozero,AndshallconductonsiteinspectionsofthemeasuringinstrumentsandsignalinstructionsandthelocationofthemechanismForexample:currentmeter,powermeterintheloopwithloadconditions,points,andclosingpositionindicatorinstructions,soastomakeagoodresultofthecorrectjudgmentWhataretherequirementsforthedoorofthedistributionroomorthehighpressureroomA:thedooroftheHVdistributionroomrequiresstrong,tight,fireproofandoutwardopeningTheyaregenerallyequippedwithautomaticcylinderlock,theperformanceofthelockshouldbegoodWhenpatrollinghighvoltagepowerdistributionequipment,thedoormustbelockedconveniently,mainlytopreventthesmallanimalsfromenteringthegroundandcausetheshortcircuitfaultItpreventstheexteriorpersonnelfromintruding,mistakenlymoves,mistakenlytouchestheequipment,andhasanaccidentThedoorofthehighvoltagedistributiondeviceroomdoesnotneedtobeopenedwithoutthekeyOnlytheoutsidedoorshouldbeopenedwithakeysothatpeoplecanevacuatequicklyincaseofemergencyThemaintasksofpersonnelhandlingtheaccidentondutyiswhatAnswer:themaintaskofpersonnelondutyisthehandlingoftheaccident:()limitthedevelopmentoftheaccidentassoonaspossible,eliminatetherootcauseoftheaccident,andrelievethedangertothepersonalandequipmentsafetyIfnecessary,theequipmentwillbecutoffandtheunitwillbestopped()makeeveryefforttoensurethepowersupplyofthefactory,andimplementthemeasurestoensurethepowersupplyintheemergencyaccordingtotheoperatingrulesofthesite"The()adheretotheoperationofthenormalequipmentWherepossible,theincreaseinloadnotdirectlyaffectedbytheaccidentinvolvedanddamagetheunit,inordertomaintaintheplantoutputunchanged,thevoltageandfrequencyadjustmentsystemisnormaltrendorrestricttheuser,eliminatetheoverloadofequipmentThe()accordingtothemeter,therelayprotectiondevicemovementandthesignaldisplay,carriesonthecomprehensiveanalysis,judgesthenatureandthescopeoftheaccident()checkandtestquickly,identifythefaultpointsandisolatethem,resumetheequipmentintimeandrestorethepower(heating)totheusersassoonaspossibleThe()dogoodsafetymeasuresandnotifythemaintenancepersonneltoprocessorrepairthefaultyequipmentOndutypersonnelinthewholeprocessoftheaccidentshouldbestrengthenedcontact,operationshouldbe"stable,accurate,fast",obeyorders,listentotheconductorWhatshouldbefocusedonpreventingmisoperationaccidentofswitchingoperationAnswer:morethanoftheelectricalmisoperationaccidentoccurredinkVandthefollowingsysteminadditionthefollowingfivekindsofwrongoperation,accountingformorethanoftheelectricalmisoperationaccident,harshnature,seriousconsequences,isthefocusofourdailymisoperatingThe()incorrectpullormisscircuitbreakerordisconnectingswitchThe()pullisolatingswitchwithloadThe()liveearthwireorliveearthingswitchThe()earthingswitchonThe()nonsimultaneousjuxtapositionTheInadditiontotheabovepoints,itisimportanttopreventtheoperatorfromfallingathighaltitude,passingintotheelectrifiedinterval,makingamistakeontheelectrifiedstructureandavoidingtheelectricshockofthepersonWhatarethebasicmeasurestopreventmisoperation)graspthe"safetyfirst"ideologicaleducationandimplementtheresponsibilitysystemofsafetyproductionTheelectricpowerproductionof"safetyfirst"is"qualityfirst,safetypowersupplyistoensurethatthebasisforthedevelopmentofnationaleconomicproduction,meetthepeople'slifeistheguaranteeofstability)graspthebasicworktoensuresafetyCarryoutrulesandregulations,strictlycontroltheoperationofpowergeneration,powersupplyandusers,andcarryouteducationinaccordancewithlabordiscipline,Arethebasicworktoensuresafety,longtermadherencetohighstandardsandstrictrequirements,andstrivetoachievepracticalresults)catchtechnicaltraining,improvethequalityofpersonnelonduty,toachievethe"threecookedthree"requirementsThreefamiliarmeans:familiarwiththeequipment,systemsandbasicprinciplesfamiliarwithoperationandaccidenthandlingfamiliarwiththeproceduresandregulationsofthispostThreerefersto:Tocorrectlyoperateandoperationanalysisitcantimelyfindfaultsandtroubleshootingtheycanmasterthegeneralmaintenanceskills)strengthenoperationalmanagement,andconstantlyimprovetherelevantrulesandregulations,toensurethatthecorrect,specificandpractical,toavoidmistakesintechnicalguidance)theimplementationoftechnicalmeasurestopreventmisoperation,andrequirementsandnewprojectstoachievethreeatthesametime:withthemainequipmentatthesametimedesign,construction,andputintooperationInfunction,makegreateffortstodofiveprevention:TopreventthepullingoftheswitchwiththeloadtopreventthemistakeofclosingthecircuitbreakertopreventtheelectrifiedhangingwiretopreventtheearthfromclosingtoavoidenteringtheelectrifiedintervalProvideobjectiveguaranteeforoperationsafetyWhatsecurityapplianceswitchingoperationA:safetyapplianceusedinswitchingoperationare:insulativeglovesandboots,insulationrod,electroscopeetcWhatisthefunctionofthevoltagetransformerA:thefunctionofthevoltagetransformeristochangethehighvoltageintotwoorlowerstandardVvoltageforprotection,measurementandinstrumentinstallationAtthesametime,thevoltagetransformercanbeusedtoisolatethehighvoltagefromtheelectricalstaffAlthoughthevoltagetransformerisalsoaccordingtotheelectromagneticinductionprincipleworkequipment,butitselectromagneticstructurerelationsandthecurrenttransformercomparesexactlyoppositeThetwoloopofthevoltagetransformerisahighimpedancecircuit,andthemagnitudeofthetwocurrentisdeterminedbytheimpedanceoftheloopWhenthetwoloadimpedanceisreduced,thetwocurrentincreases,sothattheprimarycurrentautomaticallyincreasesonecomponenttomeettheelectromagneticbalancerelationshipbetweentheoneortwosidesItcanbesaidthatthevoltagetransformerisaspecialtransformerwithlimitedstructureandformofuseWhatisthefunctionofthecurrenttransformerA:thefunctionofthecurrenttransformeristomeasurearelativelylargecurrentItsmainfunctionis:,alargecurrentintothestandardamp,tosupplycurrenttothecoilmeasuringdeviceandrelayprotection,improvedisolationpowersystemdynamicstabilitymeasuresofadeviceandthetwodeviceAnswer:measurestoimprovedynamicstabilityinclude:,quickremoval,shortcircuitfaultusingautomaticreclosingdevicetheengineadoptselectricalbrakingandmechanicalbrakingtheneutralpointofthetransformerisgroundedbysmallresistancesettheswitchstationanduseseriescapacitorcompensationuseinterlockingautomatatoreconcilecolumnschangethemodeofoperationfaultseparationsystemrapidcontrolofthespeedjumpvalvewhatarethecommonsystemfailuresA:commonsystemfailuresaresinglephasegrounding,twophasegrounding,twophaseandthreephaseshortcircuitordisconnectionhowtochoosethecapacityofthetwofuseofthevoltagetransformerAnswer:thecurrentratingofthetwomaincircuitfuseinthevoltagetransformershallbetimesofthemaximumloadcurrent,andthefusetimeofthemetercircuitfuseshallbelessthantheoperationtimeoftheprotectiondeviceairconditioningworkingprincipleAnswer:compressorwillgaseousFreoncompressionintohightemperaturehighpressurefreon,andthensenttothecondenser(outdoorunit)afterheatdissipationbecomenormaltemperatureandhighpressureliquidFreon,sotheairisblownoutoftheoutdoormachineAndthentothecapillaryintotheevaporator(indoor),becauseofthespacefromthecapillaryevaporatorafterreachingtheFreonsuddenlyincreases,thepressuredecreasesandthevaporizationofliquidFreonwillbecomegaseoustemperature,freon,toabsorbalargeamountofheat,theevaporatorbecomescold,fanindoorindoorairfromtheevaporatorinthewind,sotheindoormachinethewindisblowingoutitcondensesintodropsofwatervapourintheairmeetscoldevaporator,alongthepipeflowout,thisisthereasonwhyairconditioningwillwaterThegaseousFreonthenreturnstothecompressorandcontinuestocompressandcontinuetocycleWhenheating,thereisacomponentcalledthefourwayvalve,sothatfreoninthecondenserandevaporatorflowdirectionandrefrigerationwhentheopposite,sowhentheheating,outdoorblowingcoldair,indoormachineblowinghotairInfact,theuseofjuniorhighschoolphysicsintheliquefied(fromgastoliquid)todischargeheatandvaporization(fromliquidtogas)toabsorbtheprincipleofheatTheworkingprincipleofthecentralairconditioningcold(hot)waterunitisthebasicworkingprocessofrefrigerationunit:outdoorcold(hot)watermediumcooling(orheating),thentherefrigerantwillpumpaftercooling(hot)watertoinstallintheindoorfancoiltubetheheatexchangeunit,toachievethepurposeofindoorairtreatmentandindoorairfromthefancoilunitairreturnwaytakeplacetheprincipleofleakagecircuitbreakerCircuitbreakerusuallybycontactsystem,arcextinguishingsystem,operationmechanism,release,shellandsoonWhenashortcircuitoccurs,alargecurrent(usuallytotimes)producesamagneticfieldthatovercomesthereactionspring,thereleasepullstheoperatingmechanism,andtheswitchtripsinstantaneouslyWhentheoverloadoccurs,thecurrentincreasesandtheheatincreasesThebimetallicplatedeformstoacertainextentandpushesthemechanismtomove(thegreaterthecurrent,theshortertheoperationtime)theroleofelectronicballastsistoproducehighvoltagewhenthelampisnotshining,tomakeitbreakdown,dischargework,andthenlimititscurrentthroughtheratedvalue,sothatitcanemitlightnormally

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