Mining EOV (electrically operated valve) control system with phase order protection function

Abstract

The invention relates to a mining EOV (electrically operated valve) control system with a phase sequence protection function. The output of a three-phase power supply is connected with a main contact of a first alternating current contactor. The output of the main contact of the first alternating current contactor is connected with a three-phase motor. Two ends of the first alternating current contactor are connected to a second alternating current contactor. A controller is connected between the three-phase power supply and the three-phase motor. The controller comprises a phase order recognition protector and an EOV control loop which is connected with the phase order recognition protector. The mining EOV control system has the advantages that the phase order protection and relative control functions are achieved for the EOV; the phase order protection function is integrated with the EOV control loop; the integral design is applied in an EOV control box of the underground coal mine, so that the serious accidents such that the valve rod is twisted off and the motor is burned are avoided, and reliable technical support is provided for the safety production of the underground coal mine.

Description

[0001] technical field [0002] The invention relates to an electric valve control system, in particular to a mining electric valve control system with a phase sequence protection function. Background technique [0003] At present, in the control application of traditional electric valves in coal mines, conventional forward and reverse circuits are generally used to realize valve opening and closing operations, that is, forward and reverse control of the driving motor. However, after maintenance and replacement of equipment in the coal mine underground power supply system, it is easy to cause the problem of "wrong phase" of the three-phase power supply, and once the electric valve is "reversed" due to the wrong phase, it is often easy to cause serious serious problems such as twisting the valve stem and burning the motor. Failure, this situation occupies a large proportion in various electromechanical failures in coal mines, and there is no practical and effective solution a...

AI Technical Summary

Problems solved by technology

However, after maintenance and replacement of equipment in the coal mine underground power supply system, it is easy to cause the problem of "wrong phase" of the three-phase power supply, and once the electric valve is "reversed" due to the wrong phase, it is often easy to cause serious serious problems such as twisting the valve stem and burning the motor. Faults, this situation accounts for a large proportion of various electromechanical faults in coal mines, and there is currently no practical and effective solution

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