Automatic control device of power isolation switch

Abstract

An automatic control device for a power isolation switch comprises a switching power supply, a control power supply switch, an electric opening and closing mechanism, an open-phase monitoring circuit,a phase voltage balancing circuit and a control circuit; the electric opening and closing mechanism comprises a motor speed reduction mechanism, an internal threaded pipe and a connecting plate. A disconnecting link of a power disconnecting switch body is provided with a connecting rod, a motor speed reducing mechanism is installed on a supporting plate, an inner threaded pipe is installed on a power output shaft of the motor speed reducing mechanism, a lower supporting seat plate is arranged on the inner threaded pipe, and the upper end and the lower end of the connecting rod are hinged to the connecting rod and the lower supporting seat plate respectively. The switching power supply, the open-phase monitoring circuit, the phase voltage balancing circuit, the control circuit and the power switch are installed in the element box and connected with the motor speed reducing mechanism through wires. According to the invention, the switching-on and switching-off actions can be controlledon the ground, the disconnecting link of the power isolating switch body can be automatically switched off as long as any one power transmission line is open-phase or unbalanced in voltage, the disconnecting link can be automatically switched off after a power supply line is recovered, and power supply of electric equipment is recovered.

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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