光纤通信技术在电气化铁路接触网检测中的应用

Application of Optical Fiber Communication Technology to Catenary Detection in the Electric Railway

介绍利用光纤作媒介，采用调频工作方式，将取自接触网（网压２７．５ｋＶ）的传感器信号传送到地面低压测量处理设备的方法，它在准高速铁路接触网检测中，解决了高低压隔离和信号传输的问题，并具有衰减小、容量大、频率特性好、速度快、可靠性高及抗干扰能力强等优点。实验获得的不同速度下接触导线在典型位置的位移抬高量、应变及冲击加速度等结果，对分析准高速下接触网的振动规律。

A method of delivering the sensor signal from the catenary overhead( 27.5 kV) to the processing equipment at the low voltage on the ground by using optical fiber and frequency modulation.The problems of isolation from the high to low voltage side and the signal delivering in the detection of the catenary wire of quasi high speed railway are solved.It has the advantages of less attenuation,large volume,good frequency feature,fast speed,high reliability and anti interference etc.The results of the rising displacement,strain and shock acceleration of the catenary at the typical position under the different speeds have been obtained in experiments.These results have improtant effects on analyzing the catenary vibration rule at quasi high speed condition and designing the structure of the high speed electric railway.