ZPW-2000A軌道電路天津鐵道職業技術學院鐵路信號基礎設備維護課程ZPW-2000AtrackcircuitTianjinRailwayvocationalandtechnicalcollegeMaintenanceofbasicrailwaysignalequipment移頻軌道電路認知1.移頻的概念2.移頻的參數選擇3.基本工作原理Cognitionoffrequencyshifttrackcircuit1.Concept2.Parameters3.

Workingprinciple1.基本概念移頻自動閉塞是以移頻軌道電路為基礎的自動閉塞。它選用頻率參數作為控制信息,采用頻率調制的方法,把低頻信號(Fc)搬移到較高頻率(載頻fo)

上,以形成振幅不變、頻率隨低頻信號的幅度作周期性變化的調頻信號。將此信號用鋼軌作為傳輸信道來控制通過信號機的顯示,達到自動指揮列車運行的目的。1.BasicconceptFrequencyshiftautomaticblockisanautomaticblockbasedonfrequencyshifttrackcircuit.Thefrequencyparameterisusedasthecontrolinformation,andthelowfrequencysignal(Fc)ismovedtothehigherfrequency--carrierfrequencyf0bythemethodoffrequencymodulation,soastoformthemodulationsignalwithoutchangingamplitudewhilethelowfrequencysignalchangesperiodically.Takethissignalcontrolthedisplayofthroughsignalbytracktransmissionchanneltoachievethepurposeofdirectingthetrainoperationautomatically.低頻信號整形后的低頻信號載頻信號調頻信號整形調制FCF0+F0-△fFCF0F0+△f+lowfrequencysignallowfrequencysignalaftershapingcarrierfrequencymodulatedfrequencyshiftsignalshapingFMFCF0+F0-△fFCF0F0+△f+2.移頻的參數選擇（1）低頻頻率:從10.3～29Hz，每隔1.1Hz一個，呈等差數列，共18個。10.3、11.4、12.5、13.6、14.7、15.8、16.9、18、19.1、20.2、21.3、22.4、23.5、24.6、25.7、26.8、27.9、29Hz（2）載頻：

ZPW-2000A型無絕緣軌道電路載頻為8種，防止載頻的越區傳輸和電纜芯線的運用。下行采用1700和2300Hz,上行采用2000和2600Hz,

-1和-2交替使用。2.Parameterselectionoffrequencyshiftautomaticblock.（1）Lowfrequency:from10.3to29Hz,whichisarithmeticprogression,every1.1Hzgetsalowfrequency,10.3,11.4,12.5,13.6,14.7,etc.（2）Carrierfrequency:ZPW-2000Ajointesstrackcircuitadopts8kindsofcarrierfrequenciestopreventoverzonetransmissionandapplicationofcableline.Downlinecarrierfrequenciesare1700and2300Hz,uplineare2000and2600Hzandtype-1and-2areusedalternatively.載頻頻率：下行1700—11701.4Hz

1700—21698.7Hz2300—12301.4Hz2300—22298.7Hz

上行2000—12001.4Hz2000—21998.7Hz2600—12601.4Hz2600—22598.7Hz（3）頻偏：Δf=11HzCarrierfrequency：

downline1700—11701.4Hz

1700—21698.7Hz2300—12301.4Hz2300—22298.7Hz

upline

2000—12001.4Hz2000—21998.7Hz2600—12601.4Hz2600—22598.7Hz（3）Frequencyoffset：Δf=11Hz牽引電流分析——SS4型電力機車譜波電流大小和比重諧波次數頻率諧波電流諧波次數頻率諧波電流諧波次數頻率諧波電流n(HZ)(A)n(Hz)(A)n(HZ)(A)基波5097.32110500.634120590.09621000.452211000.1134221000.043315019.882311500.564321500.07642000.532412000.14422000.04752509.742512500.464522500.06863000.412613000.0864623000.05073505.112713500.3854723500.07884000.362814000.084824000.05494502.762914500.3464924500.087105000.343015000.095025000.058115501.643115500.345125500.076126000.343216000.0945226000.07136500.993316500.3085326500.093147000.323417000.095427000.065157500.743517500.2495527500.104168000.323618000.0755628000.068178500.703718500.1755728500.098189000.273819000.0505829000.057199500.723919500.135929500.0982010000.244020000.046030000.050中心載頻的選擇Analysisoftractioncurrent

timesofharmonicfrequencyharmonic

timesofharmonicfrequencyharmonic

timesofharmonicfrequencyharmonicn(HZ)(A)n(Hz)(A)n(HZ)(A)basic5097.32110500.634120590.09621000.452211000.1134221000.043315019.882311500.564321500.07642000.532412000.14422000.04752509.742512500.464522500.06863000.412613000.0864623000.05073505.112713500.3854723500.07884000.362814000.084824000.05494502.762914500.3464924500.087105000.343015000.095025000.058115501.643115500.345125500.076126000.343216000.0945226000.07136500.993316500.3085326500.093147000.323417000.095427000.065157500.743517500.2495527500.104168000.323618000.0755628000.068178500.703718500.1755728500.098189000.273819000.0505829000.057199500.723919500.135929500.0982010000.244020000.046030000.050基本工作原理運行方向信息傳遞方向247524632499251125232487L11.4HU26.8U16.9LU13.6L11.4L11.4247524872463249925112523LU13.6L11.4HU26.8U16.9HU26.8L11.4RunningdirecitonInformationtransmittingdirection247524632499251125232487L11.4HU26.8U16.9LU13.6L11.4L11.4247524872463249925112523LU13.6L11.4HU26.8U16.9HU26.8L11.4

小結概念

參數

工作原理