Wire guided rail-less vehicle safety monitoring circuit - has bridge measurement circuit monitoring guide conductor characteristic impedance

摘要

A safety circuit for railles vehicles with guide tracks has a conducting wire along the route supplied from a generator and terminated with its characteristics impedance. It incorporates detection of interruption of single wires of the conductor or failure of individual resistors making up the terminating resistance. A measurement device monitoring guide conductor characteristic impedance is connected to a signalling device sending signals to the vehicle. The measurement device is a bridge circuit supplied from the generator with arms contg. the conductor and a coil of a transformer driving a threshold switch.