Grounding switch capable of extinguishing arc quickly through electromagnetic reluctance tension

Abstract

The invention relates to a grounding switch capable of extinguishing arc quickly through electromagnetic reluctance tension. The grounding switch comprises a fixed contact and a moving contact of which abutting ends are arranged in a vacuum arc-extinguishing chamber, and further comprises an electromagnetic reluctance tension mechanism connected with the moving contact; the electromagnetic reluctance tension mechanism is composed of a terraced push rod, a metal disk and a permanent magnet disk both arranged on a large-diameter section of the push rod in a sleeve manner, a cylindrical magnetizer fixedly arranged at one end of a small-diameter section of the push rod, a hollow cylindrical insulating sleeve with a ring slot, and a yoke circularly arranged at periphery of the cylindrical insulating sleeve, wherein the large-diameter section of the push rod is connected with the moving contact, the metal disk is located above the permanent magnet disk and is attracted together with the permanent magnet disk, and the cylindrical magnetizer is located at the hollow position of the cylindrical insulating sleeve; and the grounding switch further comprises a hollow permanent magnet disk support plate of which the upper side fixes the permanent magnet disk, and a gap part between the permanent magnet disk support plate and the metal disk is provided with a plurality of compressed energy storage springs. The grounding switch capable of extinguishing arc quickly through electromagnetic reluctance tension is simple in structure and relatively low-cost, performs switch-on action very quickly, has high arc-extinguishing capability, and can switch on large current.

Description

technical field [0001] The invention relates to the technical field of high-voltage switches, in particular to an electromagnetic reluctance pull rapid arc-extinguishing grounding switch which has the capability of extinguishing submerged arcs and closing short-circuit currents and can be used repeatedly in gas-insulated metal-enclosed switchgear. Background technique [0002] The grounding switch is a very important electrical equipment in the power system. It is divided into two types: open type and closed type. The open type is similar to the grounding switch of the isolating switch, which is directly exposed to the air; the closed type is immersed in insulating media such as SF6, insulating oil and vacuum. The enclosed earthing switch can also be divided into two types, that is, the ordinary earthing switch and the fast earthing switch. The fast earthing switch has two main purposes: one is to close a large current, especially to close the short-circuit fault current man...

AI Technical Summary

Problems solved by technology

[0003] At present, the rapid grounding switch that appears in the field of research, such as the latest ultra-fast vacuum grounding switch developed by ABB, can short-circuit the fault arc and extinguish it within 1.5ms. The service life and high price greatly limit the promotion and application of such products

The fast grounding switch based on the electromagnetic eddy current repulsion mechanism can meet the requirements in terms of opening and closing speed, but due to the inherent structure of the driving coil and the operating copper plate, if there is no effective positioning, the impact generated during the high-speed closing process of the fast grounding switch will be extremely Large impact moving contact centering

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