Time-limited protecting device for three-phase AC point switch

Abstract

The invention discloses a time-limited protecting device for a three-phase AC point switch. The device comprise a time-limited protector and an alarm host computer; the time-limited protector comprises a three-phase current transformer, a rectifier circuit, a voltage stabilizing circuit and a timing circuit which are sequentially connected; a winding B1, a winding B2 and a winding B3 at the primary side of the three-phase current transformer are respectively correspondingly connected with an A phase line, a B phase line and a C phase line of a three-phase power supply; a relay driving circuit and an RS-485 alarm communication circuit are connected to the output end of a timing circuit; a coil of the relay of the three-phase AC point switch is connected with the relay driving circuit; the alarm host computer comprises an RS-485 communication module which is connected with the RS-485 alarm communication circuit, a PLC module connected with the RS-485 communication module, and a touch type liquid crystal display screen which is connected with the PLC module. The time-limited protecting device for the three-phase AC point switch is simple in structure, and convenient to use and operate; the three-phase AC point switch can be remotely monitored, so that a three-phase AC motor is prevented from being burnt out, and the practicability is improved.

Description

technical field [0001] The invention relates to the technical field of turnout control systems, in particular to a time-limited protection device for a three-phase AC switch machine. Background technique [0002] In the station control mode, when the turnouts converted by the station attendants arrange the route and have a squeeze fault, the console can be used to alarm the switch to detect and cancel the route in time, and cut off the power supply of the switch machine, so as to prevent the switch machine from rubbing Working continuously for a long time under current state or locked rotor state will burn out the motor. However, when the turnouts under the control of CTC equipment or the dispatchers in the dispatching center arrange the routes and convert the turnouts, the number of stations managed by the dispatchers is large, and some route arrangement orders are automatically completed by the computer according to the dispatching plan. If the personnel cannot detect the...

AI Technical Summary

Problems solved by technology

However, when the turnouts under the control of CTC equipment or the dispatchers in the dispatching center arrange the routes and convert the turnouts, the number of stations managed by the dispatchers is large, and some route arrangement orders are automatically completed by the computer according to the dispatching plan. If the personnel cannot find the fault phenomenon in time and take measures in time, it is very easy to cause the switch machine to work continuously for a long time under the state of friction current or locked-rotor state, burn out the motor, and bring great safety hazards to railway transportation.

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