Low-voltage vacuum switch

Abstract

The invention relates to a low-pressure vacuum switch, which comprises the insulated arc extinguishing chamber 1 in piston cylinder structure, and internal movable and stable contactors 2 and 3; the stable contactor is fixed inside the copper frame 6 packign the outer end of chamber; and it has outward one-way valve 7 connecting the outer space of arc extinguishing chamber; the chamber and the frame 8 have three groups of permanent magnets 9 between them, whose two polar axles are symmetry; the magnetic poles of nearby groups and nearby permanent magnets are reversed; the middle of frame is mounted with current mutual inductor 10; the lower part is mounted with current voltage magnetic detacher 11; the lower part of switch frame is mounted with hand-operated gate button 16; the piston rod is mounted with close compression spring 18 and open spring 19; the current mutual inductor, the current voltage magnetic detacher are connected to the intelligent protective controller 24 outside the frame. The invention has better vacuum degree, long service life of contactor, stable electromagnetic detachment, and low cost.

Description

technical field [0001] The invention relates to a switching device, in particular to a low-voltage vacuum switch. Background technique [0002] Today's power system has a large capacity and complex network, so the power system puts forward higher and higher requirements for the reliability, safety, installation and maintenance, and environmental protection of switching devices. In the low-voltage distribution network, the commonly used switches are isolating knife switch, automatic air switch and AC contactor, etc.; the automatic air switch arc extinguishing system adopts steel sheet arc extinguishing grid or uses clay arc extinguishing cover to install deionized metal grid The AC contactor uses an arc extinguishing cover made of asbestos cement. These arc extinguishing methods have poor arc extinguishing performance, especially when short-circuiting large currents, a large arc will be generated to cause arc short-circuit, which will endanger the safe operation of the power ...

AI Technical Summary

Problems solved by technology

In my country, the 400V low-voltage side outlet protection of 10KV transformers usually uses an isolation switch. The isolation switch is equipped with a fuse, which protects against overload and short circuit. At the same time, when the line is short-circuited, the fuse will take a period of time to act, and the sensitivity is poor, so the fuse has serious defects as the main protection of the low-voltage side of the transformer.

In factories and other low-voltage power distribution lines, the commonly used switches include knife switches, plastic case automatic air switches, and frame automatic air switches. The above switches are difficult to meet the requirements of safe operation of low-voltage power distribution lines such as factories

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