接触网外文资料 英汉翻译.docx

接触网外文资料 英汉翻译.docx

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接触网外文资料英汉翻译

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

Wecalculatedtheminimumhangerlengthontheassumptionthatthemessengerwiretensionis39.2kN;contactwiretensionis14.7kN;andspanlengthis50m.Whenweassumeastandardsystemheight（850mm）equivalenttothatofexistingfeedermessengerwiretypeoverheadcontactlineinTokyo,onlytheminimumhangerlengthofPH840mm2wireislessthan150mm.Ifthesystemheightisassumedtobe960mm,theminimumhangerlengthofPH840mm2wireislargerthan150mm.

2.5Currentcollectingcharacteristics

Wecalculatedthecontactlossrateandcontactwireupliftandstrainatsupportbysimulationwhenweuseeachtestedwireasamessenger,andcomparedtheresultswiththestandardvaluesthatcanrealizestablecurrentcollection.Tables3and4showsimulationconditionsandstandardvalues,respectively.Figure3showsthecontactlossrateofthe2ndpantograph.Asaresultofthesimulation,thecontactlossrateofthe1stpantographwassetat0%forallwiresandcontactlossratesofthe2ndand3rdpantographsbecameseveralpercentatspeedshigherthan180km/h.However,thecontactlossrateupto160km/h,whichispracticallythehighestspeedonnarrow-gaugelines,is0%.Figures4and5showthecontactwireupliftandstrainatsupport,re-

Table3Conditionsofsimulation

Table4Standardvaluesofcurrentcollectingcharacteristics

Fig.3Simulationresults（Contactlossrate）

Fig.4Simulationresults（Contactwirestrainatsupport）

Fig.5Simulationresults（Contactwireupliftatsupport）

spectively.Eitherisnotoverthestandardvalueuptothespeedof200km/hwithanywire.

2.6Examinationresults

Sincethecurrentcapacity,tensilestrengthandcurrentcollectingcharacteristicssatisfiedthestandardvaluesnomatterwhichwireweuse,wejudgedtheappropriatenessofthewiresbasedonthewireresistance.Table5showsthejudgmentresults.Undertheconditionofan855Acurrentflow,wemarked"O"ifthewireresistancesatisfiesthejudgmentstandardand"X"ifnot.Consequently,wereachedaconclusionthatuseofPH730mm2wireisappropriatewithrespecttothe855Acurrentcapacity.

Table5Judgmentresults

3.Testbycurrentcollectiontestingequipment

ThecurrentcollectiontestingequipmentoftheRailwayTechnicalResearchInstituteusedforthistesthasafulllengthof500mandcancarryoutrunningtestsuptothespeedof160km/h,byusinganactualcontactwireandpantograph.WechoseaPH730mm2wireamongthewireswhichwereappropriateforthetestinChapter2,constructeditasamessengerforthetestingequipment,andexamineditscurrentcollectingcharacteristics.Testconditionsareasfollows.

3.1Testconditions

3.1.1Basiccompositionofcatenaryandusedpantograph

ThecatenaryofthetestingequipmentwascomposedtothespecificationshowninTable6,whichisusedfornarrow-gaugelinesinTokyo.ThissystemhastwoPH356mm2messengerwiresandaGTM-SN170mm2contactwire.

Table6Testconditions

3.1.2Pantographdamper

WeusedaPS26pantographwithadampercurrentlyusedforthelimitedexpresstrainsonnarrow-gaugelines,andalsoexaminedthecasewherethedamperisremovedtoassumecommonvehicles.

Figure6showsthecatenarycompositionandthemeasuringpointsoftestingequipment.

Fig.6Catenarycompositionandmeasuringpointsofcurrentcollectiontestingequipment

3.2Testresults

ThetestresultsareshowninFigs.7to9whenmessengertensionissetatthestandardvalue（39.2kN）.IntheseFigures,theresultsinthecaseswithandwithoutpantographdampersarecompared.

3.2.1Contactlossrate

Figure7showstherelationbetweenspeedandcontactlossrate.Inthecasewherethereisapantographdamper,itis0.26%atthespeedofabout156km/h.However,itissubstantiallylessthanthestandardvalueof5%.Inthecasewheretherearenodampers,thecontactlossisnotgenerateduptoabout150km/h.

3.2.2Contactwirestrain

Figure8showstherelationbetweenspeedandcon-tactwirestrainatsupport.Theallowablestressforoscillatingfatigueofcoppercontactwireissetat60MPabasedontheresultsofanexperiment,or500×10-6whenconvertedintostrain.Sincethestraininthisexperimentisconsideredasthedifferencebetweenthemaximumandminimumvalues,thestandardvalueofcontactwirestrainissetat1000×10-6atthefullamplitude.Asittakesamaximumvalueatabout150km/h,thevalueis175×10-6atthemaximum,whichisconsiderablylessthanthestandardvalueofcontactwirestrain.

Fig.7Testresults（Contactlossrate）

Fig.8Testresults（Contactwirestrainatsupport）

Fig.9Testresults（Contactwireupliftatsupport）

3.2.3Contactwireuplift

Figure9showstherelationbetweenspeedandcontactwireupliftatsupport.Asittakesamaximumvalueof10.8mmatabout120km/h,itisconsiderablytobelessthanthestandardvalueofcontactwireupliftatsupport.

Figures7to9showthedifferenceinthecharacter