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1、外文资料（一）CurrentdensityaccordingtotheeconomicsectionofthewireresearchCurrentdensityaccordingtotheeconomicsectionatthewire,accordingtothefollowingformula:=(1-1)Jn==(1-2)whereIc------designsoughtbythecurrentcalculation,unitA;b-----linewiththecostofwirecross-sectionofrelationsco
2、efficient;------ratesPotentialfortheyuan/(kw•h);------maximumloadfactor,unitofh;------costfactors,accordingtostateregulations,canbefoundonthemanual;Figure1wirerunningcostsandtheannualcross-sectioncurvestandardssectionisnot,Bytheplan(1),wecanseethatthecurveFsotherecorrespond
3、ingtothelowestpoint,becausethepowerlosschargessectionAwiththedecreaseofthereasons,ifnotenvisagedcurveFsplay,Sectionincreasewouldinevitablyleadtotheincreaseinoperatingcosts.Soadmissionstandardssectionshouldnotonlysatisfytheminimumrequirementsofthepowerloss,butalsoreducerunni
4、ngcostslessbecause(1)Ingeneral,theestablishmentoffactoriesorloadadevelopmentprocess,theinitialvalueissmallerthanthedesign,graduallyinordertoachievetheexpectedvalue,butnetworkiscompletedbytheloadconsidered,Thisisnotconsistentwiththeactualsituation,inotherwords,powerlossisnot
5、designedsomuchtotheimagination;(2)DesigncalculationsindicatetheactualloadIcthanbigdesignvalue;(3)Fcurverelativelyflatbottom.Therefore,theselectioncriteriasection,itshouldbebychoicesmallerthanthecrosssection,asFcurveflatbottom,operatingcostsoflessimpact,takingintoaccountthel
6、oadvalues,aswellaschangesinthelaw,Theoreticalcalculationofthepowerlosswillbelargerthantheactualvalue.withtheoptionstosavemuchoftheinitialinvestmentandtheconsumptionofnon-ferrousmetals.InthefactorypowersupplysystemdesignusingJnwirecrosssection,Energylossesarestillhighvolumeo
7、flargefactoriesintolineandtheelectricnetworkintheshortoccasionsapplication.MethodusedJnwirecrosssectionstillinuse,butitshouldbenotedthatthismethodhasthefollowingproblems:(1)1.2formulaofthebvalueisnotconstant,thedomestictariffbetavalueisnotuniform,OperatingcostsofEuropiumval
8、ueindifferentcountriesshouldhavetheperiodofchange.(2)Thismethodisonlyfromtheoperat
