Condition Monitoring of High Voltage Power Delivery Path to Train using Non-Invasive Impedance Measurement Method

Rapid transit systems are typically powered by high voltage direct current (HVDC). The HVDC power supply is fed to a train either via overhead line or third rail with respect to the running rail. The power is delivered from the power substation to the train through insulated high current carrying feeder cables. A reliable power delivery path is critical to ensure minimum downtime of the train system. This paper presents a non-invasive impedance measurement method for monitoring the health condition of the HVDC power delivery path.