Three-station insulation earthing switch

Abstract

The invention discloses a three-station insulation earthing switch. The three-station insulation earthing switch comprises a main shaft, an earthing shaft and an insulation shaft, wherein a main shaft limiting crank arm and a driven wheel are connected to the main shaft, the main shaft limiting crank arm is located above the driven wheel, a driving wheel and a sector earthing shaft plate are connected to the earthing shaft, the driving wheel is located above the sector earthing shaft plate, the driving wheel is meshed with the driven shaft, an insulation shaft crank arm and a sector insulation shaft plate are connected to the insulation shaft, the insulation shaft crank arm is located above the sector insulation shaft plate, a connecting rod is connected between the insulation shaft crank arm and the main shaft liming crank arm, one end of the connecting rod is movably connected with the main shaft limiting crank arm, and the other end of the connecting rod is connected with the insulation shaft crank arm in a sliding mode. According to the three-station insulation earthing switch, ground connection of the three-station insulation earthing switch is achieved through gear transmission, switching-on and insulation of the three-station insulation earthing switch are achieved by means of transmission of the connecting rod, therefore, the transmission is accurate, the reliability of ground connection is effectively improved, and the three-station insulation earthing switch is simple in structure and convenient to operate.

Description

technical field [0001] The invention relates to an electrical switchgear, in particular to a three-position isolating grounding switch applied in a switch cabinet. Background technique [0002] As an important device in the power system, electrical switches are widely used in power generation, transmission, and distribution systems, and are also widely used in industrial and automation fields. In order to improve the reliability and quality of power supply for users and save the floor area, the current switchgear is developing in the direction of oil-free, high safety, high reliability, miniaturization and integration. [0003] High-voltage AC isolating switch (hereinafter referred to as isolating switch) is a kind of insulation distance between contacts that meets the specified requirements and an obvious disconnection mark when it is in the opening position; it can carry current under normal circuit conditions when it is in the closing position. Switching devices for curr...

AI Technical Summary

Problems solved by technology

[0006] The three-station isolation-grounding switch in the prior art mostly adopts connecting rod transmission between the operating shaft and the main shaft, the transmission efficiency is low, and the chute of the connecting rod transmission mechanism will have error accumulation during the transmission process, resulting in transmission accuracy. lower

In addition, the existing three-position isolation-grounding switch realizes the interlocking of the mechanism mainly by opening shaft holes on the operating shaft and the main shaft. In order to ensure the strength of the operating shaft and the main shaft, the diameter of the shaft is usually made larger. This results in an overall bulky mechanism and a waste of material

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