CLEAR-TRACK STATE CONTROL METHOD Russian patent published in 2008 - IPC B61L23/16 

FIELD: transport.

SUBSTANCE: method consists in that an AC signal is sent into the track circuit one end and, at the same end, the current value of the current is compared with the occupancy threshold value, while at the other end the current voltage value is compared with the clear-state threshold vale. Given the occupancy threshold value exceeding the current one, the track line section occupancy is recorded, and, given the current value exceeding the threshold value, the track line section clear-state is recorded. With the train approaching the track line section (the input end should be a supplying one), the power supply current goes up. With the threshold value exceeding the power supply current, the track line occupancy is recorded along with the output end voltage taken to be the clear-state threshold voltage. Given the threshold exceeded by the current voltage, the clear-track line state is recorded. The product of multiplication of the safety factor (K_s=0.95 to 0.9) by the supplying end current at the maximum insulation impedance and with the rated shunt at the connection of the power supply.

EFFECT: higher reliability of the track line state control.

1 dwg