Self-energy arc extinguishing chamber for increasing thermal expansion effect

Abstract

The invention discloses a self-energy arc extinguishing chamber for increasing thermal expansion effect. The self-energy arc extinguishing chamber comprises a dynamic arc contact, an insulating cylinder, a static contact seat and a dynamic arc contact seat, wherein the static contact seat is arranged at the upper end of the insulating cylinder and is used for installing an upper arc contact and an upper arc striking ring; the dynamic arc contact seat is arranged at the lower end of the insulating cylinder and is used for installing a lower arc striking ring and a lower arc contact; a thermal expansion chamber is formed in the insulating cylinder; a fracture of the arc extinguishing chamber is formed at two ends of the insulating cylinder; the dynamic arc contact penetrates through the insulating cylinder, the upper arc striking ring and the lower arc striking ring along the axial direction, and makes contact with the upper arc contact and the lower arc contact at a switching in position; an upper arc striking surface and a lower arc striking surface are respectively formed on the adjacent surfaces, in the fracture direction, of the upper arc striking ring and the lower arc striking ring distributed at two ends of the fracture; a plurality of through grooves are formed on the upper arc striking surface and / or the lower arc striking surface along the radial direction; the notches of the through grooves are communicated with the inner rings of the arc striking rings; the tails of the through grooves are not communicated with the outer ring edges of the arc striking rings; the connection straight lines between the notches and the tails do not pass through the centers of the arc striking rings; and the inclination directions of the connection straight lines are consistent.

Description

technical field [0001] The invention relates to the field of high-voltage switch manufacture and technology, in particular to a self-energy interrupter with increased thermal expansion effect. Background technique [0002] The self-energy interrupter is widely used in existing high-voltage switches, such as circuit breakers, which can reduce the volume of the switch and greatly reduce the operating power. [0003] Most of the self-energy interrupters adopt the principle of expansion chamber and auxiliary compressed air to extinguish the arc. When this kind of arc extinguishing chamber breaks a large current, it only relies on part of the energy of the arc itself to pressurize the thermal expansion chamber, and reversely blows the arc when the current crosses zero. Under the same current level, the structure of the arc extinguishing chamber determines the effect of the arc heating expansion chamber. Especially for the radially expanded expansion chamber, the arc cannot go d...

AI Technical Summary

Problems solved by technology

Especially for the radially expanded expansion chamber, the arc cannot go deep into the expansion chamber, resulting in insufficient heating of the expansion chamber, which is not conducive to building pressure and blowing the arc

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