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Detection method for searching for electric leakage area of rail transit power supply system

A power supply system and rail transit technology, applied in the field of rail transit, can solve the problems of timely processing of faulty areas, troubles of resuming normal operation of investigation work, inability to quickly determine faulty sections, and unavoidable leakage of electricity, etc., and achieve rapid recovery. , the error is small, the effect of ensuring safety

Active Publication Date: 2020-02-11
XIANGTAN HENGCHUANG ELECTRONICS DEVICES
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  • Claims
  • Application Information

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 entire line will trip, and the fault section cannot be quickly determined, which brings great trouble to the timely processing of the fault area, investigation work, and restoration of normal operations.

Method used

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  • Detection method for searching for electric leakage area of rail transit power supply system
  • Detection method for searching for electric leakage area of rail transit power supply system
  • Detection method for searching for electric leakage area of rail transit power supply system

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Embodiment Construction

[0026] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] see Figure 1 to Figure 5 As shown, the embodiment of the present invention will firstly describe the system used to realize the method.

[0028] The earth leakage protection devices currently on the market are all voltage detection type protections. When an earth leakage fault occurs, all protection devices on the line will detect the existence of leakage voltage (the voltage of the parallel circuit is equal), so it will cause the entire line Tripped, unable to determine the faulty section of the leakage.

[0029] The protection device of the system of this embodiment introduces the judgment of the differential current, which can avoid the above-mentioned tripping of the whole line, but when there is a vehicle braking on the line, the value of the differential current cannot be determined, so the device of th...

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Abstract

The invention provides a detection method for searching for an electric leakage area of a rail transit power supply system, which includes the following steps: detecting in real time, by a differential current sensing device, a difference current value between each power supply positive bus and its corresponding negative bus in a power supply area, wherein the current sensing device includes a Hall sensor; when an electric leakage occurs, obtaining the difference current polarity distribution of each power supply area according to the difference current values; and determining each area, whereall the difference current polarities are the same, among all the power supply areas as an electric leakage area. The method of the invention can accurately and quickly detect the difference current,thereby accurately locating the electric leakage area and facilitating the search and repair.

Description

technical field [0001] The invention relates to the technical field of rail transportation, in particular to a detection method for finding a leakage area of ​​a rail transportation power supply system. Background technique [0002] At present, there is no DC grounding protection for high-speed rail transportation, and because the DC traction power supply system of light rail and maglev rail transit is compared with the traditional subway power supply method, the negative pole 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 response to this situation, when a ground leakage fault occurs on an urban rail transit line, the entire line will trip, and the fault section cannot be quickly determined, which brings great troubl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/04H02H3/32H02H7/26G01R31/52
CPCH02H3/042H02H3/325H02H7/26
Inventor 李根良黄志刚刘慧良方兵
Owner XIANGTAN HENGCHUANG ELECTRONICS DEVICES
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