接触网外文翻译文献Word格式.docx
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接触网外文翻译文献Word格式.docx
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DevelopmentofFeederMessengerWireTypeOverheadContactLinewithOneCopperMessengerWire
TakahiroHAMADAAtsushiIWAINAKA
Researcher,FormerResearcher,
ContactLineStructures,PowerSupplyTechnologyDiv.
Feedermessengerwiretypeoverheadcontactlineshavedrawnattentionrecentlyfromtheviewpointoflabor-savingformaintenance.AtypethatusestwoPH356mm2messengerwireswasintroducedintotheTokyodistrict,whileanotherthatusesanSBTACSR730mm2messengerwireintotheKansaidistrict.Intermsofthenumberofmessengerwires,theone-wiretypeismoreuseful,asitinvolvesasmallernumberofparts.Asthematerialforthewire,copperisbetterthanaluminum,sinceitdoesnotrequireconnectionwithdifferentmetals.Torealizetheadvantagesofthetwosystems,therefore,wedevelopedafeedermessengerwiretypeoverheadcontactlinethathasonlyonecoppermessengerwire.
Keywords:
feedermessengerwiretypeoverheadcontactline,PH730mm2messengerwire,currentcollectingcharacteristics
1.Introduction
Feedermessengerwiretypeoverheadcontactlineshaveastructuretocombinethefunctionoffeederwiththemessengerwire.TheyhavedrawnattentionrecentlyinJapanfromtheviewpointoflabor-savingformaintenance.Theyusetwohard-drawncopperstrandedconductorPH356mm2messengerwiresintheTokyodistrictandanaluminumconductorsteel-reinforcedSBTACSR730mm2messengerwireintheKansaidistrict.Intermsofthenumberofmessengerwires,theone-wiretypeismoreusefulasitinvolvesasmallernumberofparts,andcopperisbetterasthematerialforthewirethanaluminumsinceitdoesnotrequireconnectionwithdifferentmetals.Therefore,wepromotedthisresearchforthepurposeofdevelopingafeedermessengerwiretypeoverheadcontactlinethathasonlyonecoppermessengerwiretorealizetheadvantagesofthetwosystems.
Inordertodeterminewhatwiressuitthenewoverheadcontactline,wechoseanarrow-gaugelineinTokyoasatestsite,studiedwhetherelectricalandmechanicalcharacteristicsofwiressatisfythestandardvalues,andexaminedthecurrentcollectingcharacteristicsofvarioustypesofwiresthroughsimulation.Asaresult,itwasprovedthatthePH730mm2messengerwirewasthemostappropriateintheovercrowdedrailwaysectionsinTokyo.
Basedonthisresult,weactuallyconstructedaPH730mm2messengerwireandinvestigateditscurrentcollectingcharacteristicsbyusingcurrentcollectiontestingequipmenttofindthatstandardvalueswereallsatisfiedatthespeedof160km/h.Itwasalsoprovedthatthiswiretypecouldbeusedforoperationatspeedsupto160km/h.
2.Examinationoftheoptimumwires
Table1liststhewiresexaminedascandidatesofoneonemessengerwire.Weexaminedthecurrentcapacity,wireresistance,tensilestrength,minimumhangerlengthandcurrentcollectingcharacteristics,todeterminetheapplicability
Table1Dimensionsofwire
2.1Currentcapacity
WeexaminedwhetherthewiretemperatureisbelowtheallowablelimitattheconditionsinTable2.Theallowabletemperatureis90℃fortheharddrawncopperstrandedconductor(PH)and150℃forthethermalproofharddrawncopperstrandedconductor(THDC).Figure1showsthewiretemperatureriseswhenacurrentof855A,whichisthemaximumvalueforwiresusedinTokyo,flowsfor3,600seconds.Theshadedportionrepresentsthesurroundingtemperatureof35℃,
Table2Conditionsoftemperaturecalculation
Fig.1Wiretemperaturerises
andtheportionofslashmarkthetemperaturerisesbytheJouleheat.TherearenowiresofTHDCorPHthatshowatemperatureriseovertheallowablelimitunderthiscondition.
2.2Wireresistance
Toevaluatethewireresistance,wecomparedseveralkindsofmessengerswithtwoPH356mm2messengerwirescurrentlyusedonthenarrow-gaugelinesinTokyo.InFig.2,theslashlinedbarsshowtheresistanceafterthetemperatureriseatan855Acurrentflowandtheshadedbarsshowthewireresistanceat20℃.Acomparisonofthe resistanceoftwoPH356mm2wireswiththatoftestwiresat20℃(shadedbar),provesthattheresistanceofTHDC670mm2wireandPH670mm2wireishigherthanthatoftwoPH356mm2wires.Moreover,inthecaseoftheresistanceaftertemperaturerise(slash),onlytheresistanceofTHDC670mm2wireandPH670mm2wireishigherthanthatoftwoPH356mm2wires.
Fig.2Wireresistance
2.3Tensilestrength
Sinceitisassumedthatthiscatenarysystemisconstructedtoastandardtensionof39.2kN,itisaconditionthatthetensilestrengthissetatover86.24kN,asthesafetyfactorofcopperis2.2inJapan.Allthetensilestrengthsforthetestwiresreferredtointhispaperareover86.24kN.
2.4Minimumhangerlength
Wecalculatedtheminimumhangerlengthontheassumptionthatthemessengerwire
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