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接触网外文翻译文献

接触网外文翻译文献

（文档含中英文对照即英文原文和中文翻译）

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