A New Transverse Magnetic Field Contact for Vacuum Interrupter

Abstract

The invention discloses a contact of a transverse magnetic field of a novel vacuum arc-extinguishing chamber. The contact comprises a first conducting rod, a first contact piece, a second contact piece and a second conducting rod, wherein one end of the first conducting rod is arranged at one end of a first contact end, the other end of the first conducting rod is a protruding end and is opposite to an opening direction of the first contact piece; one end of the second conducting rod is arranged at one end of a second contact end, the other end of the second conducting rod is a protruding end and is identical to an opening direction of the second contact piece; when the contact is closed, another end of the first contact end is in contact with another end of the second contact end and bears pre-compression when the contact is closed. The contact provided by the invention has the following advantages: 1, the area of the contact can be obviously improved at certain diameter of the contact, so as to improve the cut-off capacity of a breaker; 2, a radial outward opening distance of the contact can be controlled to be smaller under certain travel, so as to be beneficial for an expansion movement of an initial arc to be tend to be radially outward; 3, a tangent relative movement between movable and static contacts can be generated to prevent the contact from being partially ablated.

Description

Technical field: [0001] The invention belongs to the technical field of electrical appliances, and relates to a contact of a vacuum interrupter of a vacuum circuit breaker for realizing power system protection and switching, in particular to a transverse magnetic field contact of a vacuum interrupter. Background technique: [0002] At present, vacuum circuit breakers are mainly used to cut off large fault currents in medium and low voltage circuits. It mainly uses the excellent voltage recovery characteristics of the vacuum to disconnect the circuit at the zero-crossing point of the current, thereby effectively protecting the circuit. As the core part of the vacuum circuit breaker, the vacuum interrupter undertakes the task of extinguishing the arc. At present, there are mainly two types of vacuum interrupters, the longitudinal magnetic interrupter and the transverse magnetic interrupter. [0003] The purpose of longitudinal magnetism and transverse magnetism is to avoid se...

AI Technical Summary

Problems solved by technology

For cup-shaped transverse magnetic contacts, the arc movement characteristics are excellent, but the arc running surface is basically limited to the edge of the contact cup, and the arc starting area and arc running area overlap; for spiral groove type transverse magnetic contacts, the utilization rate of the contact surface Higher, but as the contact area increases, the rotation of the concentrated arc is difficult to form a uniform ablation on the contact surface

[0005] At present, the rotary motion of the constricting arc driven by the transverse magnetic field is greatly affected by factors such as the arc starting position, current magnitude, and breaking phase, and there are still uncertainties in the breaking process.

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