电机员面试机舱电器基本知识讲解.docx
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电机员面试机舱电器基本知识讲解.docx
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电机员面试机舱电器基本知识讲解
BASICKNOWLEDGEOFENGINEROOMELECTRICALEQUIPMENT
SAFETYPRECAUTIONSDURINGELECTRICALMAINTENACE:
Giveasmanyprecautionsasyoucanindentify:
1.Makesurethepowerisoff,ifhavecontrolfuseremoveit;
2.Workareasshouldbewelllighted,andkeepworkingareaclear;
3.WaresafetyPPE,andpayattentionatthisworkatanytime;
4.Makesuretomakenoticelike“MANATWORK,DONOTOPERATE.”To
showotherPeoplethatsb.Isworking.
5.Toolsshouldbewillinsulation&goodcondition
6.Tocheckelectricalisolationchecklist.
MAINSWITCHBOARD
3.1.1ExplainbrieflysafetyincorporatedinMainSwitchboard:
-Handlesforopeningthedoorsonswitchboardcubiclesareusuallylinkedtoanisolatingswitch.Thisensuresthatsuppliestocomponentsinthecubicleareswitchedoffbeforethedooropened.
Fusedisolatorsareisolatingswitchesthatincorporatefuses.Theactionofopeningtheswitchisolatesthefusessothattheycanbereplacedsafety
EMERGENCYSWITCHBOARD
IndentifyallmachineriesfedfromEmergencypowersupplyinMSB:
-No.2steeringgear
-No.3E/Rfan
-No.1radar
-Bosunstorelightingtransformer
-EmergencyA/C110transformer
SafetyinterlockstorunEmergencygeneratorwhileMSBisalive:
-WhentheMSBisalive,toruntheemergencygeneratorthebustieswitchwillgiveasignalthattheE/Gcouldnotputonload.
-NVR
Power
AIRCIRCUITBREAKER
RoutineCheck,Maintenance&Interval:
-Avisualexaminationofcircuitbreakersinmain,emergencyandsectionboardswillusuallyprecedeoperationaltests.Thesurveyorwillparticularlychecktheconditionofmainarcingandauxiliarycontactsforsignsthewear,misalignmentandoverheating.Asimilarinspectionoffixedandmovingisolatorcontactsattherearofacircuitbreakerwillbemade.
Arcchutesmustbeclean,freeofarcdebrisandcorrectlyaligned.Allinternalwiringshouldbei
ExplainbrieflythetypeandworkingprincipleoftheDieselGeneratorson
board
-Thedieselgenerators’speedisaccuratelymanagedbyanelectronicfuelgovernor
whichmaintainsanalmostconstantoutputfrequencyoveritsloadrange
ALTERNATORS
Explainbrieflythetypeandworkingprincipleoftheshaftgeneratoronboard
-Apropulsion-shaftdrivengeneratorcanbeanefficientmethodforextractingelectricpowerfromtheship’smainengineasthepowerisderivedfromlowercostfuelthanthatusedforanauxiliarydrivengeneratorunit.Theshaftgeneratormaybefitteddirectlyin-linewiththeslowspeedpropulsionshaftor,morecommonly,isgear-drivenuptoahigherspeed.
Also,byusingashaftgeneratorasthemainsourceofelectricpowerduringlongseapassages,thedrivengeneratorunitsoperateforshortperiodsonlywithareducedmaintenancerequirement.
Anapparentdisadvantageofashaftgeneratoristhatithasnodirectfrequencycontrolasthisisdeterminedbythemainenginewhichissetfortheshipsfull-wayspeedrange.Themeansthatthefrequencymustbeseparatelyregulatedattheoutputoftheshaftgeneratortomaintainaconstant60HZtotheship’selectricpowerconsumers.
MOTORS
Detailedproceduresoncompleteoverhaul,withprecautions:
-Feeduptheelectricalisolationcertificate
Switchoffthepowerandremovethecontrolfuse,tomakesuretheoverhaulmotorpoweriscutoff.Andmakeanoticetomakesurethatoverhaultimenobodyoperatorit.
Disconnecttheconnectionandchecktheinsulation,afterthatremoverotorandcheckthebearingifthebearingnogoodtakeout.Cleanalltheequipmentsandchecktheinsulationofcoilside,andspringthevarnish,andputtheheatlamptodryitandchecktheinsulation.Afterdryupputbacktherotorandtowsidecover,checkthemotortomakethemotorisingoodcondition.Thenputbackthemotorintooriginalplaceandputbackthecontrolfuseandswitchonthepowerandtestrun.
INSULATIONMEASUREMENT
NecessityofInsulationcheckonequipments
-Onboardtheshipameasurementoftheinsulationresistancegivesoneofthebestguidestothestateofhealthofelectricalequipment.Theresistanceshouldbemeasuredbetweeninsulatedconductorsandearth,andbetweenconductors.
Values&EvaluationofReadings:
BestwhenNew
-100MΩ~500MΩ
Acceptableinservice
-1MΩ
Notacceptabletoputinservice
-Lessthan1MΩ
WhathappenifoperatedwithunacceptedlevelofInsulation?
-Itcanbedamagetheinstrumentorelectricalcontrol.
NecessityofInsulationcheckonCablesandlightfittings:
-Tomakesureanycablesshortcircuitorshortedtoearth.
WINDLESSANDWINCH
Safetyinterlocksincorporatedinstarterpanel,Providelogicdiagram
-Overloadinterlock
-Oilpressurehigh
-Oiltemperaturehigh
STEERINGGEARSYSTEM
Listoutvarioussafetyinterlocksincorporatedinsystem
-Overloadinterlock
-Phasefailinterlock
-Overcurrentrelay
-RudderMAX.anglelimitswitch
-HYD.Oillevelswitch.
PROVISIONCRANE
Checkbeforearrivalport,toensurecorrectoperation:
-Checkallthelimitswitchhanderfreeornot,checkallthelimitswitchisgoodworkingornot.
-Checktheremotecontroller
-Checkthecontrolpanel
-Checkthemotorsinsulation
GANGWAY&MOTOR
Checkbeforearrivalport,toensurecorrectoperation:
-Checkallthelimitswitchhanderfreeornot,checkallthelimitswitchisgoodworkingornot.
-Checktheremotecontroller
-Checkthecontrolpanel
-Checkthemotorsinsulation
Nameallsafetyinterlocksandtrips:
-Uplimitinterlock-Inlimitinterlock–emergencystop–Twosideschangeoverinterlock
-Overloadtrip
HEELINGANDBALLASTCONTROLPANEL
UnderstandHeelingandBallastControlsystemandassociatedcircuits-
Theheelingandballastcontrolpanelisintheshipoffice.Onthiscontrolpanelwecanoperatetheheelingandballastpumpmotortoincreaseordecreasethewaterintheballastwatertanktokeeptheshipstayinginbalanceduringchargingordischargingcargosinportorsailingatsea,andpumpoutthebilgeofthecargoholdsonboardifthebilgelevelwashigh,orthealarmsactivated.
Circuit:
UPSANDSTORAGEBATTERY
UPSoperationandchargingarrangement
-UPSisuseforsomeimportantsystem.WhenpowerbleakouttheUPSwillautomaticallygivesupplytothesesystem
-Therearethreetypeofcharge
1.normalcharge(normallychargeabove6hours)
2.Floatcharge(cancontinuouslycharge)
3.Tricklecharge(2~3hours)
Careandmaintenanceofstoragebattery
-Checktheliquidleveliflowtopupwithdistilledwater
-Testtheelectrolytebythehydrometershowinggreenthenokifshowingwhiteneedtorechargeifredthenneedcheckthebatterystatus
Nametheequipmentswherestoragebatteryisused
-Somealarmsystem
-GMDSS&Othernavigationequipment
Safetyprecautionrequirementinbatterystoragespace
-Wellvent.
-Preventexplodelight
-PreservePPE
-Emergencyeyewash
-Nonakedlight
GALLEYEQUIPMENTS
ListallelectricalequipmentsinstalledinGalley
-GalleyEXH.Fan
-Disposer
-Deepfatfryer
-Elec.Cookrange
-Electricgriddle
-Electricoven
-Ricecooker
-Dishwasher
Routinemaintenanceandinterval
-Galleyfanoverhaul
-Cookandcleansysteminsulationcheck
-Controlswitchcheck
-Mainpowerboxcircuitcheck
WASHINGMACHINEANDDRYERROOM
Routinemaintenanceandinterval
-Everydaycheckthedrymachinefitter,andcleanit.
-Monthlycheckthewashingmachineanddrymachineinsulation.Checkthemachinesvibrationandtakecareofanyabnormalnoisefromthemachine.
ENGINEROOMEQUIPMENTS
MGPS
ExplainfunctionandoperationofMGPS
-MGPSisdesignedtopreventthemarinegrowthsfromsettlinginthevitalcomponentsofvesselsuchascondenser,pipingorpumpbychlorinecompoundwhichisproducedwhentheseawateriselectrolyzed.
ELEVATOR
Understandvariousinterlocksonelevator
-Escapedooropen:
whenthedoorisopentheelevatorwillautomatictrip.
-Dooropen:
everydeckelevatordoorkeepopen,theelevatorwillstop.Likeweusespecialkeytoopenanydeckdoortheelevatorwillstopatthattime.
-Overload:
ifthemotoroverloadthebreakwilltrip.
-Weightoverlimit:
iftoomanypeopleinsidetheelevatororcarrytoomuchthingstheelevatorwillnotwork,keepstop.
-Uplimit:
iftheelevatorgoingupandcannotstopontopofthewellthereisalimitswitchtostopit.
-Downlimit:
likeuplimit.
-Overspeed:
iftheelevatorworkingandthespeedisoverlimitthentheelevatorwillstopautomatic.
STEERINGGARESYSTEM
Listoutvarioussafetyinterlocksincorporatedinsystem
-Overloadinterlock
-Phasefailinterlock
-Overcurrentrelay
-RudderMAX.anglelimitswitch
-HYD.Oillevelswitch.
PURIFIERS
Workingprincipleandassociatedcircuits
-ThepurifiersisthesystemforpurifythefueloilortheLUB.Oil.Beforeuse.Itseparatethesludgeandwaterfromtheoilbythespecificgravityfromthebowl.Thendischargethesludgeandwaterbytheoperatorwaterwithasettingtime.
ENGINEROOMCRANES
ListoutallinterlocksprovidedonE/RCranes
-Uplimit
–Downlimit
–Forwardlimit
-Aft.Limit
-Rightleftlimit
–Overloadtrip
-Emergencystop
AIRCONDITIONINGANDREFRIGERATIONMACHINY
Workingprincipleofairconditioningsystem
-Theairconditioningsystemworkingprinciplewecanseefromthefollowingdiagram(alltheimportantequipmentsalreadynamed)
-Withthecompressorstartthesuctiongasiscompressedtoahightemperatureandpressure.Thenthegasmovesintothewater-cooledcondensertoletthegastosaturationtemperature.Andthengothroughthereceiverandthefilter-drier(whichkeeptherefrigerantcleananddry)afterthatgothroughtheevaporator,beforegoinwiththeexpan
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