激磁涌流的高频信号及对应答器干扰分析

Analysis on high frequency signals of magnetizing inrush current and its interference for balise

在列车自动过分相时,牵引变压器产生的激磁涌流通过母排、轮对和钢轨回流到变电所,而在这个过程中激磁涌流可能会对应答器上行链路信号产生干扰.激磁涌流对应答器上行链路干扰的途径是应答器接收天线的耦合,要清楚了解其干扰,必须了解激磁涌流4.23 MHz附近信号分量,因此对激磁涌流高频信号的分析是非常有必要的.本文用Matlab软件对激磁涌流进行了仿真得到其仿真数据.然后,用LabWindows/CVI软件进行仿真数据加载并且对激磁涌流进行短时傅里叶变换(STFT),得到激磁涌流4.23 MHz附近信号分量.最后,用FEKO软件进行激磁涌流对应答器上行链路信号的干扰仿真.研究结果表明激磁涌流含有4.23 MHz附近信号分量较小,不会对应答器上行链路信号产生干扰.

The magnetizing inrush current generated by auto-passing neutral section goes through busbar,wheel and rail back to substation.The Up-Link balise may be interfered by the magnetizing inrush current in this process.This interference way is receiving antenna coupling.To clearly understand their interference,it is necessary to get signal component near 4.23 MHz of the magnetizing inrush current.So the research on the high frequency signals of magnetizing inrush current is necessary.This paper uses MATLAB to simulate magnetizing inrush current,and data of magnetizing inrush current are acquired.And then this paper loads the simulation data with Labwindows/CVI and does STFT to get the signal component near 4.23 MHz.Finally,using FEKO does interference simulation of magnetizing inrush current to up-link balise.The research results show that the magnetizing inrush current contains small weight signals of 4.23 MHz,and it can not interfere with the Up-Link balise.