Three-station vacuum switch tube

Abstract

The invention discloses a three-station vacuum switch tube comprising a vacuum chamber, a fixed contact assembly, a moving contact assembly and a grounding contact, wherein the grounding contact comprises a grounding contact ring and a grounding terminal, wherein the grounding terminal is electrically connected with the grounding contact ring, and a moving contact is driven by an operating mechanism to take linear back-and-forth movement between a fixed contact and the grounding contact ring; and when the moving contact, the fixed contact and the grounding contact ring are all in off states, the tolerance electric field intensity between the moving contact and the fixed contact is higher than that between the moving contact or the fixed contact and the grounding contact ring. The invention realizes the switch-on, isolation and grounding three-station functions, also not only has the advantages of compact structure, reasonable design, advanced technology, current relative standard accordance, long electrical life and mechanical life, wide application range, high safety and reliability, and the like, but also realizes that electric breakdown firstly generates between a loading terminal and a grounding terminal once vacuum degree is reduced, enables the leakage currents and the short-circuit currents to flow into earth and ensures the safety of maintenance personnel who possibly mistakenly contact the loading terminal.

Description

technical field [0001] The invention relates to a medium-voltage vacuum switch tube with a working voltage of 3.6kV-40.5kV, in particular to a three-station vacuum switch tube. Background technique [0002] Referring to the provisions of the national standard GB 2900.20 "Electrical Terminology for High-Voltage Switchgear", the fracture refers to two or more conductors of the mechanical switch, which disconnect the conductive circuit under normal conditions and connect the conductive circuit with its contact during operation. distance. In the field of high-voltage switch technology, there are the following three kinds of fractures: isolation fractures, arc-extinguishing fractures and grounding fractures. Among them, the isolation fracture is a fracture for safety isolation from the live circuit: in the divided position, there are insulation properties and disconnection signs that meet safety requirements between the isolation fractures; in the closed position, it can carry n...

AI Technical Summary

Problems solved by technology

Recently, the grounding fracture has begun to use vacuum, but because there is no breakthrough in the mechanism and structure, users do not believe in the safety and reliability of the vacuum isolation fracture, and cannot accept the vacuum isolation fracture, so no products have entered the market so far

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