A leakage protection method for urban rail transit power supply system

Abstract

The invention provides a leakage protection method of an urban rail transit power supply system, comprising the following steps: a voltage judging protection device is set between the power supply negative pole and the grounding wire of each power supply area of ​​the power supply system; the voltage judging protection device is used for monitoring When the voltage between the negative pole of the power supply and the connecting wire exceeds a predetermined value, an alarm message is issued, and the current power supply area is tripped after a preset time; The current size of the positive busbar and its corresponding negative busbar in the uplink and downlink; and according to the current size, the difference current value between the positive busbar current and the current of its corresponding negative busbar is obtained; when receiving the alarm information, according to The value of the difference current determines the power supply area where the leakage occurs. The method of the invention can accurately and quickly locate the leakage area, and is convenient for searching and repairing; at the same time, it can quickly restore the normal power supply area, thereby not affecting the operation of other areas.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a leakage protection method for an urban rail transit power supply system. Background technique [0002] At present, compared with the traditional subway power supply method, the negative pole of the DC traction power supply system of light rail and maglev rail transit does not return through the running rail, but a negative pole rail is provided for backflow. The light rail runs on rubber tires, and the maglev train runs in suspension, which makes the light rail and maglev train relatively insulated from the ground. As time goes by, leakage is unavoidable. At present, in view of this situation, when a ground leakage fault occurs on an urban rail transit line, the protection device is judged by voltage, causing the entire line to trip and affecting the operation. At present, there is a lack of relevant leakage protection methods that can quickly locate the leakage zone and ...

AI Technical Summary

Problems solved by technology

The light rail runs on rubber wheels, and the maglev train runs in suspension, which makes the light rail and maglev train relatively insulated from the ground. As time goes by, leakage is inevitable

At present, in view of this situation, when a ground leakage fault occurs on an urban rail transit line, the protection device is judged by voltage, causing the entire line to trip and affecting the operation. At the same time, because the fault section cannot be determined, it brings great trouble to the investigation work.

At present, there is a lack of relevant leakage protection methods that can quickly locate the leakage area and facilitate maintenance

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