What Are Main Safety Devices for Main Switch Board on Ship
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WhataretheMainSafetyDevicesforMainSwitchBoardonShip?
FEBRUARY8,2011BYMOHIT
TheMainswitchboardisanintermediateinstallationintheshipspowerdistributioncircuitconnectingthepowergeneratorsandpowerconsumers.Thepowergeneratorsonshipsareauxiliaryengineswithalternatorsandtheconsumersaredifferentengineroommachineriessuchasmotors,blowersetc.
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Itisveryimportanttoisolateanytypeoffaultinanelectricalsystemsuppliedfromthemainswitchboard(MSB)orelseitwillaffectalltheothersystemconnectedtothesame.Ifsuchisolationisnotprovidedthenevenashortcircuitinasmallsystemcancauseblackoutofthewholeship.
Therefore,differentsafetydevicesareusedonboardshipandinstalledonthemainswitchboard(MSB)andelectricaldistributionpanels.Thisensuressafeandefficientrunningofmachineriesandsafetyofthepersonalfromelectricshockevenwhenonesystemisatfault.
TheImportantsafetydevicesfittedonmainswitchboardare:
Circuitbreakers:Acircuitbreakerisanautoshutdowndevicewhichactivatesduringanabnormalityintheelectricalcircuit.Especiallyduringoverloadingorshortcircuit,thecircuitbreakeropensthesuppliedcircuitfromMSBandthusprotectsthesame.Differentcircuitbreakersarestrategicallyinstalledatvariouslocations.
Fuses:Fusesaremainlyusedforshortcircuitprotectionandcomesinvariousratings.Ifthe
Localcontrolstations
LocalcontroldevicesinExe.onlinecalculationandorder
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currentpassingthroughthecircuitexceedsthesafevalue,thefusematerialmeltsandisolatestheMSBfromthedefaultsystem.Normallyfusesareusedwith1.5timesoffullloadcurrent.
Overcurrentrelay:OCRisusedmainlyonthelocalpanelandMSBforprotectionfromhighcurrent.Theyareinstalledwherealowpowersignalisacontroller.Normallyrelaysaresetequivalenttofullloadcurrentwithtimedelay.
Deadfrontpanel:ItisanothersafetydeviceprovidedontheMainswitchboardindividualpanelswhereinyoucannotopenthepaneluntilthepowerofthatpanelisswitchedoff.
Apartfromthis,maintenanceandoperationalsafetyplaysanimportantpartforthesafetyofmain
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YoumayalsoliketoreadSinglePhasinginElectricalMotors:Causes,Effects,andProtectionMethods
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AboutMohitMohitKaushikisamarineengineersailingwithMaerskShipping.HehandleswebsitedevelopmentandtechnicalsupportatMarineInsight.Apartfromhandlingwebdevelopmentprojects,healsomanagesalogisticscompanyandhaveakeeninterestinmodernlogistic
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