Safe contact rail voltage monitoring device provided with caution lamp

Abstract

The invention discloses a safe contact rail voltage monitoring device provided with a caution lamp, and relates to the technical field of contact rail voltage monitoring. Both one end of a first quick-acting fuse (FU1) and one end of a second quick-acting fuse (FU2) are connected with a direct current power supply; the other end of the first quick-acting fuse (FU1) is connected with an anode of an on-site LED (Light-emitting Diode) caution lamp (LED2), one end of a fifth resistor (R5), one end of a first resistor (R1), the other end of the second quick-acting fuse (FU2), one end of a second resistor (R2), and terminals 15 and 16 respectively; the other end of the first resistor (R1) is connected with a cathode of a fourth schottky diode (ZO4), one end of a coil of a first relay (J1), and one end of a third resistor (R3) respectively; and the other end of the third resistor (R3) is connected with one end of a first potentiometer (W1). The device adopts high-reliability relays; the working reliability and the safety of the device are improved greatly due to mutually independent two-way electric quantity detection lines and logical combination outputs output by the two relays; and a trouble signal of any one detection line can be sent immediately.

Description

Technical field: [0001] The invention relates to the technical field of contact rail voltage monitoring, in particular to a safety type contact rail voltage monitoring device with a warning light. Background technique: [0002] In the DC traction power supply system, there are two current delivery methods, catenary and contact rail, and the contact rail has the advantages of simple structure, easy installation and maintenance, and low failure rate. The DC750V contact rail method has been more and more popular. In recent years, the number of subway projects using DC1500V contact rail is also increasing. Because the contact rail is ground equipment installed next to the two running rails, compared with the overhead catenary, it still needs to consider some necessary protective measures to ensure the safety of on-site operation and maintenance personnel, among which there are DC750V or DC1500V contactors. The demand for rail voltage monitoring devices is used to warn of the st...

AI Technical Summary

Problems solved by technology

[0004] 1. Both need to be powered by an external auxiliary power supply. In case the auxiliary power supply fails, the output signals of the two cannot guarantee the correctness of the judgment of the contact rail voltage, that is, there are potential safety hazards

[0005] 2. There is no redundant function for the line of contact rail voltage monitoring. If there are problems such as components or manufacturing process defects in the device, the device will fail, and the alarm signal for monitoring line failure cannot be issued in time.

[0006] 3. The detection method of the voltage isolation amplifier can only detect the contact rail voltage state, but for the local warning light, the output of the isolation amplifier is used to drive the intermediate relay, and then the intermediate relay is used to drive the warning light. There are many intermediate links, making it The working reliability is obviously reduced, and the HR type warning light is installed on the display panel of the control cabinet, and the main circuit voltage of DC750V or 1500V (currently HR has no DC1500V level) is directly introduced into the control cabinet, and a DC high voltage is added on the panel. risk factors for

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