Relay protection control device for motor

Abstract

The present invention discloses a relay protection control device for a motor. The relay protection control device includes a motor loop module, a power source main module, a zero sequence current loop module, a voltage loop module, a current loop module and a signal output module; the motor loop module, the zero sequence current loop module, the voltage loop module, the current loop module and the signal output module are all connected with the power source main module; and the motor loop module is connected with the zero sequence current loop module and the voltage loop module. With the relay protection control device for the motor of the invention adopted, the motor can automatically quit operation when over-current, phase failure or phase loss, low voltage and grounding occur, or a fault sound-light alarm can be emitted, so that an operator can be prompted timely, and therefore, the operation safety of equipment can be ensured, and the service life of the equipment can be prolonged.

Description

technical field [0001] The invention relates to the technical field related to electric motors, in particular to a relay protection control device for electric motors. Background technique [0002] The existing conventional three-phase asynchronous AC motor control circuit generally only has short-circuit and overload protection, but the motor often has over-current, phase failure or phase loss, low voltage, grounding and other conditions in the actual operation process. Long-term operation under phase or lack of phase, low voltage, and grounding conditions will cause the coil to overheat and increase the temperature rise, which will reduce the insulation strength of the motor coil. Burn out the motor. [0003] China patent authorization announcement number: CN 202564924U, the date of authorization announcement is November 28, 2012, which discloses an intelligent relay protection device for motors, which is composed of a power supply, a switch, and a drive appliance. The li...

AI Technical Summary

Problems solved by technology

The utility model has motor overload operation, phase failure detection and protection, and simultaneously detects the AC current in the three-phase main circuit of the motor to prevent the motor from running in phase failure and burning the motor. The disadvantage of this utility model is that it cannot solve the problem of overcurrent, The operation of phase loss, low voltage, grounding, etc., so the operator cannot be reminded in time, resulting in abnormal operation of the equipment and reducing the service life of the equipment

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