What is the working principle of automatic power-off device for wire-frame motor car?

When the traveling pantograph triggers the blackout area, the transmitter sends the carrier signal to the mainframe of the rack line power supply device, after the mainframe of the rack line power supply device judges the delay, drives the execution circuit to work, connects the rack line control area, the control area has electricity, at the same time the sound and light alarm works, the speaker sends out "the rack line has electricity, please pay attention to safety At the same time, the sound and light alarm works, the speaker sends out the sound signal of "Electricity on the line, please pay attention to safety", and the monitor lights up with the word "Electricity" in high bright red. The host uses the judgment of the signal of the locomotive in motion to make the power supply circuit work to maintain the continuity of power supply on the line. When the locomotive leaves the control area, there is no transmitter signal of the power supply device in this section, and the main control box is delayed, the power is cut off in the control area of the line, the sound and light alarm stops working, the power supply device restores static, and the power supply area is de-energized.

The above is the working principle of the automatic power-off device of the overhead line motor car.