An automatic control device for a power isolation switch

Abstract

An automatic control device for a power isolating switch, including a switching power supply, a control power switch, and an electric opening and closing mechanism, a phase loss monitoring circuit, a phase voltage balance circuit, and a control circuit; the electric opening and closing mechanism includes a motor speed reduction mechanism, an internal thread Pipe, connection plate, power isolating switch body knife switch has a connecting rod, the motor deceleration mechanism is installed on the support plate, the internal thread pipe is installed on the power output shaft of the motor deceleration mechanism, the internal thread pipe has a lower support seat plate, and the connecting rod is up and down The two ends are respectively hingedly installed with the connecting rod and the lower support seat plate; the switching power supply, phase loss monitoring circuit, phase voltage balance circuit and control circuit, and power switch are installed in the component box, and are connected with the motor reduction mechanism through wires. The invention can control the opening and closing action on the ground. As long as there is any phase loss or voltage imbalance in one transmission line, the knife switch of the power isolating switch body can be automatically disconnected. After the power supply line is restored, the knife switch can be automatically closed and the electrical equipment can be restored. powered by.

Description

technical field [0001] The invention relates to the field of electrical control equipment, in particular to an automatic control device for a power isolation switch. Background technique [0002] Power isolating switches are widely used on power supply lines (such as factory power supply lines, etc.), and play the function of turning on and off the power supply. In the actual application of the existing power isolating switch, when controlling the closing and opening of the power isolating switch, it mainly relies on manual control of the opening and closing action through the operating rod on the ground (the long length of the control rod will bring troubles to the operator. Inconvenient, time-consuming and labor-intensive operation, and inconvenient to carry). In electrical equipment, the unbalanced phase voltage and lack of phase of the three-phase power supply will affect the normal use of electrical equipment (such as motors), and even cause damage to electrical equipm...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the limitations of the structure of the existing power isolating switch, it only has the function of power supply or power off, and can only manually control the opening and closing of the power supply line, and cannot automatically disconnect the power supply when the power supply phase is missing or the phase voltage is unbalanced. The power supply of the equipment cannot provide safety guarantee for the electrical equipment. The invention provides that the operator can control the opening and closing action of the power isolating switch body by pressing the power switch on the ground, which brings convenience to the operator. , under the joint action of the phase loss monitoring circuit and the phase voltage balance circuit, as long as any phase loss or phase voltage imbalance of one transmission line of the power supply line, the control circuit can automatically disconnect the knife switch of the power isolating switch body, and in After the power supply line returns to normal, it can automatically close the knife switch of the power isolating switch body and restore the power supply of the electrical equipment, thereby achieving an automatic control of the electrical isolating switch that can protect the electrical equipment and has intelligent control functions. device

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