A contact with the function of controlling the directional expansion movement of vacuum arc

Abstract

The invention discloses a contact with a function of controlling directional extension movement of a vacuum arc. Second phases or mixtures of the second phases and copper-based alloy, which are easily subjected to electric breakdown are distributed in the contact, the second phases and the mixtures of the second phases and the copper-based alloy form continuous arrangement areas from the center of the contact, and the continuous arrangement areas are radiating, annular or spiral from the center of the contact, so that the arc can be induced to perform directional continuous extension movement along the areas rich in the second phases. The continuous arrangement areas are radiating, annular or spiral from the center of the contact. Similar to the function of a horizontal magnetic field, the second phase continuously arranged areas can provide the arc with a channel for directional continuous extension movement, so that the arc ablation on the surface of the contact can be relieved, and the breaking capacity of a switch is improved.

Description

technical field [0001] The invention relates to a contact material used in a vacuum switch, in particular to a contact with the function of controlling the directional expansion movement of a vacuum arc. Background technique [0002] Contacts are key components in vacuum switching appliances such as vacuum circuit breakers, contactors, and load switches. They are responsible for connecting and disconnecting arc circuits and load circuit currents. Excellent breaking capacity and low cut-off value, fusion welding tendency and other properties. At present, there is no requirement or consideration in vacuum switchgear to use the characteristics of the contacts to control the arc behavior during the switching process, so that the arc forms a directional expansion movement on the electrode surface. [0003] Vacuum arc is an inevitable phenomenon in the process of closing and disconnecting the circuit of the vacuum switch. The control of its behavior and process is the core of vac...

AI Technical Summary

Problems solved by technology

The weakness of this method is that the groove structure greatly reduces the mechanical strength of the contact system and the current-carrying density of the contacts, which in turn reduces the breaking current capability of the switch to a certain extent; the second is that the production process is greatly improved. cost

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