pec電氣工程專業(yè)英語證書考試-電氣工程專有名詞4_第1頁
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1、PEC電氣工程專業(yè)英語證書考試電氣工程專業(yè)英語證書考試GlossaryofElectricalEngineeringTerms4Autoranging:ADMMthatautomaticallystherangewiththebestresolutionaccuracyinresponsetotheapplication.AAC:AmpsalternatingcurrentACDC:Aswitchdesignatedfusewithei

2、therAlternatingCurrent(AC)DirectCurrent(DC).ACOnly:AswitchdesignatedfusewithAlternatingCurrent(AC)only.ACPower:ACstsfalternatingcurrentwhichisanelectricalcurrentthatfrequentlyreversesdirection.ACelectricityismeasuredaccd

3、ingtoitscycleswithonecompletecyclebeingcountedeachtimeagivencurrenttravelsinonedirectionthendoublesbackonitself.Anelectricalcurrentisabletocompletemanycyclespersecondisthengivenitsfrequencyratingbasedonthatnumberfexample

4、thetypicalfrequencyinNthAmericais60hertz(Hz)whichindicatesthatthecurrentisperfming60cyclespersecond.ACpoweristhetypeofelectricitymostcommonlyusedinhomesofficesisextremelyversatilebecauseitsvoltagecanbechangedthroughatran

5、sfmertosuitavarietyoftransmissionneeds.ADC:Dataconvertingfromanalogtodigitalfmat.ALCU:30A50A60Areceptaclesdesignatedfusewithaluminumcoppercircuitconductsidentifiedby“ALCU“stampedonthedevice.Receptacleswithoutthisdesignat

6、ionmustneverbeusedwithaluminumcircuitconducts.ActivePower:Alsoknownas‘RealPower’simply‘Power’.Activepoweristherateofproducingtransferusingelectricalenergy.MeasuredinwattsoftenexpressedinkWMW.HOWTHEAFCIWKS:Conventionalcir

7、cuitbreakersonlyrespondtooverloadsshtcircuitssotheydonotprotectagainstarcingconditionsthatproduceerraticcurrentflow.AnAFCIisivesothatnmalarcsdonotcauseittotrip.TheAFCIcircuitrycontinuouslymonitscurrentflowthroughtheAFCI.

8、AFCIsuseuniquecurrentsensingcircuitrytodiscriminatebetweennmalunwantedarcingconditions.OnceanunwantedarcingconditionisdetectedthecontrolcircuitryintheAFCItripstheinternalcontactsthusdeenergizingthecircuitreducingthepoten

9、tialfafiretooccur.AnAFCIshouldnottripduringnmalarcingconditionswhichcanoccurwhenaswitchisopenedaplugispulledfromareceptacle.PresentlyAFCIsaredesignedintoconventionalcircuitbreakerscombiningtraditionaloverloadshtcircuitpr

10、otectionwitharcfaultprotection.AFCIcircuitbreakers(AFCIs)haveatestbuttonlooksimilartogroundfaultcircuitinterrupter(GFCI)circuitbreakers.SomedesignscombineGFCIAFCIprotection.AdditionalAFCIdesignconfigurationsareanticipate

11、dinthenearfuture.ItisimptanttonotethatAFCIsaredesignedtomitigatetheeffectsofarcingfaultsbutcannoteliminatethemcompletely.InsomecasestheinitialarcmaycauseignitionpritodetectioncircuitinterruptionbytheAFCI.TheAFCIcircuitbr

12、eakerservesadualpurpose–notonlywillitshutoffelectricityintheeventofan“arcingfault”butitwillalsotripwhenashtcircuitanoverloadoccurs.TheAFCIcircuitbreakerprovidesprotectionfthebranchcircuitwiringlimitedprotectionfpowercdse

13、xtensioncds.Singlepole1520ampereAFCIcircuitbreakersarepresentlyavailable.ASTM1000:Title–StardTestMethodsfPressureSensitiveAdhesiveCoatedTapesUsedfElectricalElectronicApplications.ASTMInternationalPUBLICATIONDATE:Sep12004

14、SCOPE:Thesetestmethodscoverproceduresftestingpressuresensitiveadhesivecoatedtapestobeusedaselectricalinsulation.Thesetapesareclassifiedasfollows:Class1Nonelastomericbackingsmadefrommaterialssuchas:PaperflatcrepedFabricun

15、coatedcoatedCelluloseesterfilmsPolyethyleneterephthalate(polyester)filmsFluocarbonpolymerfilmsCompositefilamentfilmsPolyaefilmsPolyiefilmsCombinationsthereof.Class2Elastomericbackingsthatareacterizedbybothhighstretchsubs

16、tantialrecovery.Thesebackingsaremadefrommaterialssuchas:VinylchlidecopolymersVinylidenechlidecopolymersPolyethylenecopolymers.LaminatesofClass1Class2backingsshouldbetestedaccdingtoClass1testmethods.Thisstarddoesnotpurptt

17、oaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.FspecifichazardsseeSectio

18、n3.Theproceduresappearinthesectionsindicatedbelowinalphabeticalder:NOTE1TheseproceduresapplytobothClass1Class2tapesexceptasnotedabove.ThevaluesstatedinSIunitsarethestardunlessotherwisenoted.Ifavaluefmeasurementisfollowed

19、byavalueininchpoundEnglishunitsinparenthesesthesecondvaluemayonlybeapproximateisfinfmationonly.Thefirststatedvalueisthepreferredunit.NOTE2ThesetestmethodsaresimilartoIEC604543butmaydiffersometimesinsomedetails.Thisisafir

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