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ID:18023459
大小:59.50 KB
页数:12页
时间:2018-09-13
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1、DCGENERATIONSYSTEM-INTRODUCTIONPurposeTheDCgenerationsystemmakesanominal28vdcforairplanesystems.GeneralTheDCgenerationsystemhasthesecomponents:-Battery-Batterycharger-Transformerrectifierunits(3).DCGENERATIONSYSTEM-GENERALDESCRIPTIONGeneralDescriptionThe
2、DCgenerationsystemsuppliesanominal28vdctodifferentloads.ThepowersourcefortheDCsystemisusuallytheACsystem.ThebatterysuppliespoweriftheACsystemisnotavailable.TransformerRectifierUnitsTocreateDCpowerfromthenormalACsource,theDCsystemusestransformer-rectifier
3、units(TRUs).ThethreeTRUstake115vac,decreasethevoltage(transforms),andrectifyittoanominal28vdc.BatteryChargersThemainbatterychargerandauxiliarybatterychargergiveaDCvoltageoutputtochargetheirrespectivebattery.EachchargeroperateslikeaTRUafterthebatterygetst
4、ofullcharge.ThemainbatterychargersendsaconstantDCvoltagetothebatteryandthehotandswitchedhotbatterybuses.TheauxiliarybatteryandauxiliarybatterychargerpowerDCbusesonlyduringnon-normalconditions.Seethestandbypowersystemsectionformoreinformation.(AMMPARTI24-
5、34)BatteriesEachbatteryisa48ampere-hour,nominal24vdcpowersource.ThemainbatterysuppliespowerforAPUstartingandisastandbypowersourceifallotherpowersuppliesdonotoperate.Theauxiliarybatteryhelpsthemainbatterysupplystandbypoweronly.ControlandProtectionThestand
6、bypowercontrolunit(SPCU),thebatteryswitch,andthestandbypowerswitchgiveprimarycontroloftheDCsystem.ThebatteryswitchandthestandbypowerswitchgivemanualcontrolofpowertosomeDCbuses.TheSPCUgivesautomaticcontrolandprotectionofDCbuses.Itusesinputsfromtheflightco
7、mpartmentandsystemmonitoringtocontrolDCpowersourcesanddistribution.PowerDistributionTheDCpowerdistributionsystemisinthepowerdistributionpanels(PDPs)andintheSPCU.12DCGENERATIONSYSTEM-MAINBATTERYCHARGERANDAUXILIARYBATTERYCHARGERPurposeThemainbatterycharger
8、hasthesetwofunctions:-Keepsmainbatteryatmaximumcharge-SuppliesDCpowertothebatterybuses.Theauxiliarybatterychargerkeepstheauxiliarybatteryatmaximumcharge.GeneralDescriptionBothbatterychargershavethesamepartnumber.Eachbatter
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