ZPW2000A轨道电路铁路信号基础设备维护19课件

ZPW-2000A轨道电路天津铁道职业技术学院铁路信号基础设备维护课程ZPW-2000AtrackcircuitTianjinRailwayvocationalandtechnicalcollegeMaintenanceofbasicrailwaysignalequipment移频轨道电路认知1.移频的概念2.移频的参数选择3.基本工作原理Cognitionoffrequencyshifttrackcircuit1.Concept2.Parameters3.

Workingprinciple1.基本概念移频自动闭塞是以移频轨道电路为基础的自动闭塞。它选用频率参数作为控制信息,采用频率调制的方法,把低频信号(Fc)搬移到较高频率(载频fo)

上,以形成振幅不变、频率随低频信号的幅度作周期性变化的调频信号。将此信号用钢轨作为传输信道来控制通过信号机的显示,达到自动指挥列车运行的目的。1.BasicconceptFrequencyshiftautomaticblockisanautomaticblockbasedonfrequencyshifttrackcircuit.Thefrequencyparameterisusedasthecontrolinformation,andthelowfrequencysignal(Fc)ismovedtothehigherfrequency--carrierfrequencyf0bythemethodoffrequencymodulation,soastoformthemodulationsignalwithoutchangingamplitudewhilethelowfrequencysignalchangesperiodically.Takethissignalcontrolthedisplayofthroughsignalbytracktransmissionchanneltoachievethepurposeofdirectingthetrainoperationautomatically.低频信号整形后的低频信号载频信号调频信号整形调制FCF0+F0-△fFCF0F0+△f+lowfrequencysignallowfrequencysignalaftershapingcarrierfrequencymodulatedfrequencyshiftsignalshapingFMFCF0+F0-△fFCF0F0+△f+2.移频的参数选择（1）低频频率:从10.3～29Hz，每隔1.1Hz一个，呈等差数列，共18个。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）载频：

ZPW-2000A型无绝缘轨道电路载频为8种，防止载频的越区传输和电缆芯线的运用。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.载频频率：下行1700—11701.4Hz

1700—21698.7Hz2300—12301.4Hz2300—22298.7Hz

上行2000—12001.4Hz2000—21998.7Hz2600—12601.4Hz2600—22598.7Hz（3）频偏：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牵引电流分析——SS4型电力机车谱波电流大小和比重谐波次数频率谐波电流谐波次数频率谐波电流谐波次数频率谐波电流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中心载频的选择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基本工作原理运行方向信息传递方向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

小结概念

参数

工作原理