What Are Main Safety Devices for Main Switch Board on Ship

18/02/2015 WhatareMainSafetyDevicesforMainSwitchBoardonShip?

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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

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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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What Are Main Safety Devices for Main Switch Board on Ship

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