Development of a Detection System for the Catenary Vibration Monitoring

In order to monitor the uplift amount of the contact wire in the high-speed electrified railway, this paper puts forward an online monitoring system which combines the draw-wire sensor and the optical isolation of signal transmission technology. This system uses an optical fiber as the media, which works in FM mode, to transmit the sensor output signal from 25kV high voltage catenary to the low voltage equipment on the ground. It solves the high voltage isolation problem for signal transmission and has advantages of low attenuation, acceptable transmission speed, fine frequency performance, good reliability and anti-interference ability, etc. Experiments that simulate the vibration of the contact wire in typical position at different frequencies have verified the effectiveness of this monitoring system. This system has an important significance for the analysis of the pantograph-catenary interaction and the catenary vibration status for high-speed electric railways.