Three-station switch with capability of breaking bus transfer current

Abstract

The invention relates to a three-station switch with the capability of breaking a bus transfer current and solves the problems that a moving contact of the existing three-station switch has low moving speed and SF6 gas with good insulating capacity needs to be used as insulating gas for realizing rapidly breaking of the bus transfer current, so that the environment pollution can be caused. The three-station switch is characterized in that an isolation breaking conductor is arranged in an inner cavity of an isolation conductor; an isolation conductor contact finger spring is arranged in the isolation breaking conductor; a moving conductor is arranged in an inner cavity of a middle conductor; a breaking spring and a conducting rod are arranged in an inner cavity of the moving conductor; a rack is fixedly connected in a rack mounting groove processed on the moving conductor; and the middle conductor is provided with a gear meshed with the rack. The three-station switch has the beneficial effects that by rapidly breaking the conducting rod and generating compressed air blast, the rapid breaking of an isolation switch is realized and the aim of extinguishing an electric arc generated by the bus transfer current is fulfilled, so clean and dry air or nitrogen can be used as the insulating gas, the SF6 gas does not need to be used as the insulating gas and equipment is more environmental-friendly.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electric power, and in particular relates to a three-position switch capable of breaking bus transfer current used in clean and dry air or nitrogen-insulated metal-enclosed switchgear. Background technique [0002] The three-position switch is an important electrical component on the switchgear and plays a very important role in the entire power supply system. Among them, the isolating switch is used as a high-voltage isolation component, and the grounding switch is used as a safety protection component during maintenance. In the prior art, for example, the application number is 200720185173.0, and the invention name is "a 72.5KV three-position switch". The three-position switch disclosed in the patent is that the electric operating mechanism drives the insulating connecting rod to rotate, and the insulating connecting rod passes through the The thread is connected with the moving contact. Wh...

AI Technical Summary

Problems solved by technology

In the prior art, for example, the application number is 200720185173.0, and the invention name is "a 72.5KV three-position switch". The three-position switch disclosed in the patent is that the electric operating mechanism drives the insulating connecting rod to rotate, and the insulating connecting rod passes through the The thread is connected with the moving contact. When the electric operating mechanism drives the insulating screw to rotate, the insulating screw drives the moving contact to reciprocate along the insulating screw through the threaded connection. When the moving contact moves to different positions, the circuit can be effectively grounded respectively. It can be seen from its patent specification and its drawings that the above-mentioned structure drives the moving contact to reciprocate and linearly move along the insulating screw through the rotation of the insulating screw to realize the different positions of the three-position switch, thus realizing The speed of different positions of the three-position switch is consistent, and the moving speed of the moving contact is relatively slow. If dry air or nitrogen is filled between the isolation fractures, the arc is not easy to extinguish, and it is very difficult to break the bus transfer current. , to achieve fast breaking of the bus transfer current must use SF6 gas with good insulation ability as the insulating gas, and the use of SF6 gas will cause environmental pollution

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