2522011M6nullZnullnullnull/nullnullvnullnullnullJOURNAL OFSHANGHAIUNIVERSITY OFENGINEERING SCIENCEVol.25 No.2Jun. 2011null nullcI|: 1009- 444X(2011)02- 0125- 05l: 2011- 04- 26Te:d(1981- ),3,V,Z_e.Enullmail:xinyuan_luyahoo.fr=:+t(1953- ),3,V3=,Z_9ed!9.Enullmail:SnullbondE.+s陸鑫源1, 錢劍敏2, 梁鑒如3(1.ZEYpY|s,Z200002; 2.vS/,Z201620;3.Z/v0,Z201620)K1: 上海城市軌道交通地鐵2號線采用美國聯(lián)合道岔與信號國際公司(USSI)提供的數(shù)字軌道電路AF 904.通過分解電氣絕緣中的鋼軌a信號環(huán)線a阻抗連接器(Snullbond)各部分元素,對軌道電路的傳輸特性進(jìn)行了演算和分析.分析表明,阻抗連接器對于軌道電路具有較強(qiáng)的方向性.根據(jù)傳輸特性,提出了日常維護(hù)建議.1oM: 音頻軌道電路; S型阻抗連接器(Snullbond); 鋼軌波阻; 感生電流ms|: U 284.23null nullDS: AAnalysis of Transmission Characteristics of Snullbond Track CircuitLU Xinnullyuan1, QIAN Jiannullmin2, LIANG Jiannullru3(1.Shanghai Rail Transit MaintenanceSupport Center,Telecom & SignalingBranch, Shanghai 200002, China;2.Collegeof InformationSciences and Technology, DonghuaUniversity, Shanghai 201620, China;3.Collegeof Electronicand Electrical Engineering, Shanghai University of EngineeringScience, Shanghai 201620, China)Abstract: Thedigitaltrack circuit AF904suppliedbyUSSI (America) is used inShanghaiMetroLine2.Important components in theelectrical insulation system such as electricinsulating rail,signal loop andimpedanceconnector (Snullbond) were decomposed,then the calculation and analysis were conducted fortrack circuits transmission characteristics.The analysis shows that track circuit Snullbond has a strongdirectionality.According tothetransmission characteristics,proposals for daily maintenancearegiven.Key words: AF track circuit; Snullparameter impedanceconnector; waveimpedanceof rail; induced current1 nullEF3ITE,LET8,iL|l!,.EaEF(Snullbond)a|La!#s!1qF,m1U.m1Vn,l?|L)SnullbondE.|LTxMH,HY?3M,PE3E?lRx ,Vu)s,PLa,L_?|.null null nullZ/v25nullm1nullEFqFig.1null Components of typical track circuit2 nullssEi=?YV|LTx ,LTxHM3,YVEoEyE,lSnullbondEF,El|LRx93,LRx?i=.2.1nullEoEn5Eu4:ErERaELa?G?C,iuoEFZc.Eq10.5 kHzH,F55,PsYG= 1.0504null10- 3sC= 5.443null10- 8FErER= 2(r+ nrc)T:rEHrE, null/km; rcEh)rE, null; nh.r= 2. 91u nullnullfT:uE,0.67 m; nullEEq,0.21null10- 6 null/m; nullEHq,100 H/m;f|q.E9LE=L i,LeEh)LcF.L= Le+ 2(Li+ nLc)E=LiLi= 268u nullnullfELeLe= 0.4ln d- aaT:dELW,m; arEL,m.oTLrc= 0.3null 10- 3 null;Lc= 1.27null10- 3 mHVrTVR= 2 2.91u nullnullf + nrcL= 0.4ln d- aa + 2 268u nullnullf + nLc(1)G1363u106 m,P|q10.5kHz,EHL3,|XHqT(1):R= 0.417 7 nullL= 1.115 22null 10- 4 HKuoEF| Zc|= 44.3766 null2.2 null3sEpV,E3Erail,|L9HYHWMq1:Erail=nullsBdsdt1|LHYLVErailEIrail.2.2.1 null 發(fā)送端信號環(huán)線 Tx8nullB:p,L3HVA3HF,dB= null4nullIedlR2T:BbH.,s(,ESnullbondBMIrail.,8nullB:pOFT,l|LRxHYsTnull127nullnull null nullZ/v25nullnull=null1.745- 1.745null0.722 2- 0.722 29.499999999null10- 9 1.75+ y(1.75+ y)2+ (0.7235- x)2+ 1.75- y(1.75- y)2+ (0.7235- x)20.7235- x +9. 499 999 999null10- 9 0. 723 5+ x(1.75- y)2+ (0.723 5+ x )2+ 0. 723 5- x(1.75- y)2+ (0. 723 5- x)20.723 5- y +9. 499 999 999null10- 9 1. 75+ y(1.75+ y)2+ (0.723 5+ x )2+ 1.75- y(1.75- y)2+ (0. 723 5+ x)20. 723 5+ x +null9. 499 999 999null10- 9 0.723 5+ x(1.75+ y)2+ (0.723 5+ x) 2+ 0. 723 5- x(1.75+ y)2+ (0.723 5- x )21.75+ y dxdynull null null= 1.165 4null 10- 6 WblErail= nullnull2nullf = 0.07684V.2.4nullM#LRxnullHQpmE5,m1,!0, T4=,?LphZ_9v,ph5=3Z_.m3VAM#uLRxnullHHHY3:H1EYV;H3SnullbondEQ_h;zH24HYD.m3null|LHYFig.3null Signaling loop induction magnetic fluxnull nullyUS,PxLH,PySnullbondL.LHQ_Snullbond3,iOH,pVpx)HsYB2= nulli2nullx, null null B4= nulli2null( b- x)FB= B2+ B4x)|dx,z1.445m,YVs9HYnull=null3.4960.0021.445nulli2nullx+nulli2null(b- x) dxM#LR xnullHYsYnull null= 3.909 5null10- 7 Wbnull E= nullnullcos null= null null2nullf = 0.02577V2.5 nullM#LTxnullH?M#LT xnullsY,B1Snullbond,SLRxnull;6B1?|LT xzH.Z_VQ_.,pLT xzHx)HBcl= nulli2nullx .x)|dx,z1.445mYVs9HYnull=null3.4960.005nulli null 1.4452nullx dxnullcl= 1.798null10- 6 WbEcl= nullclnullcos null= nullcl null2nullf = 0.106 3 VSnullbond3HYSlLRxnullM,nullSnullbond= 3.909 5null 10- 7 Wb,ESnullbond= nullSnullbondnullcos null=nullSnullbond null2nullf = 0.02577V7mLTxnullphZ_Z_,M#LTxnullHE= Ecl- ESnullbond= 0.092779V.2.6 null SnullbondHYEW%,Snullbondz%.m4Snullbond(|L)HY1.m:V/GQ?M#LTnullxlHY;WLuRxlHY;LlM#LRnullxlHY;LSnullbondL=3.5m.BlLHsHYT:BuE3HY,6Bnull128nullnull2d,:SnullbondE.+snull nullM#u?L3M#HY.m4Vn,FvSnullbondV9FlTHY,M#HY9qv.YTHYlM#HY,DH,usM#uY.m4nullSnullbondf/HY1Fig.4null Comparison of magnetic fluxs withdifferent Snullbond lengths3 nullnullESnullbondZ_.lSnullbond|L-1EB=20 lg-uKvuKv= 20 lg nullRxnullRxnull= 9.435 dBH,M#E3H?B.C,TEsM#u,vs1M#|L.,VaM#u?,PSnullbond|LB.l|L?f,lEFyvluAF904nullCPU=AUvY,H,An5l.ID:1 nullb.?LmM.:0,2002.2 null9,S=,+C,.?Lo.lM.:,2003.3 n