A selective separation and closing equipotential connection device for subway screen doors and its control method

Abstract

The invention discloses an equipotential connection device for selectively separating and closing subway screen doors and a control method thereof. The equipotential connection line connects rails and subway screen doors and is provided with a connection mechanism, which is in a normally open state; Obtain the potential difference between the rail and the subway shield door; the connection mechanism monitoring control module obtains the voltage data measured by the voltage measuring device, the switch signal of the subway shield door and the opening and closing state signal of the equipotential connection line connection mechanism, and makes a logical judgment; When the connection mechanism of the equipotential connection line is in the disconnected state, if the shield door is opened and the potential difference between the shield door and the rail exceeds the set value, the connection mechanism will be closed, otherwise the status quo will be maintained; when the connection mechanism of the equipotential connection line is in the closed state , if the screen door is closed, the connection mechanism is disconnected, otherwise the status quo is maintained. This scheme can not only ensure the safety of passengers getting on and off the bus, but also solve problems such as ignition of screen doors, and has high reliability.

Description

technical field [0001] The invention relates to an equipotential connection device for selectively separating and closing subway screen doors. Background technique [0002] my country's subway power supply system generally adopts DC1500V and DC750V power supply systems. The train draws current from the catenary through the pantograph, and the current flows back to the negative busbar of the DC traction substation through the rail. In the DC traction power supply system, the steel rail is insulated from the ground to reduce the influence of stray current, but this also brings about the potential problem of the steel rail. In the subway station, screen doors are installed parallel to the platform, parallel to the train. In order to prevent passengers from stepping on air, the distance between the screen door and the vehicle is very small. When the passenger gets on and off the bus, the body is very easy to contact the carriage and the screen door body at the same time. If th...

AI Technical Summary

Problems solved by technology

[0003] However, during the operation of the subway, screen doors are often damaged due to improper installation of insulation during construction, and electrical pollution such as humidity and dust during operation.

In addition to realizing the equipotential connection between the rail and the door body, the equipotential connection line of the shielded door also leads the traction backflow in the rail to the shielded door, and connects to the ground through the weak joints of the shielded door, causing fire or combustion between the shielded doors and inside. arc, burning parts inside the screen door

In severe cases, the equipotential bonding line may even be blown

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