| 摘要 |
A device for protection of rail circuits of AC motive power area against impact of reverse DC has surge protection and power supply units, a rail line, a scheme of their control, track-choke transformers, a sucking buster of reverse AC motive power, a control unit regarding the distance of the train tail using equipment of a tonal track circuit, an audio-frequency generator, a receiver of tone frequency, a resistor, a . The surge protection and power supply units are connected to midpoints of at least three (four) damping circuits. One of the units is installed on the border of docking station and testing area of AC motive power and two (three) other ones are at a distance of not less than the length of the first three (four) block-sections consecutively one after another. The control scheme of surge protection and power supply units comprises a first comparator, a lay-out of switch signal generation of the unit including the first inverter, a logical element I and JK- trigger, the second logical element I, a dual-threshold element. Thus the inverse output of comparator is connected to the output of rectifier and connected to the midpoint of choke-transformers using matching transformers and consistent with it using enabled blocking capacitor and using the direct input of the comparator the voltage of specified value is connected. |
