Slide plate type breaker arc-extinguishing device

Abstract

Provided is a slide plate type breaker arc-extinguishing device, belonging to the technical field of an emergency protective device and used for improving the short-circuit current breaking capability of a circuit breaker. The slide plate type breaker arc-extinguishing device includes an insulation shield plate, an armature, a magnet yoke, a slide rod, and a pressure spring, the magnet yoke is fixed on one side of the static contact of the circuit breaker, the insulation shield plate and the armature are arranged at the other side of the static contact, the insulation shield plate is fixed on the armature and corresponds to the gap between the movable contact and the static contact of the circuit breaker, one end of the slide rod is fixedly connected with the magnet yoke, and the other end of the slide rod is screwed into an anti-releasing nut after passing through the pressure spring and the armature. The insulation shield plate can be quickly inserted into the gap between the movable contact and the static contact of the circuit breaker when the circuit breaker breaks the short-circuit current, so that the arc between the movable contact and the static contact can be extinguished, in this way, the arc energy amplification time is shortened, the short flashover or no flashover of the circuit breaker is realized, and the short-circuit current breaking capability of the circuit breaker is greatly improved.

Description

technical field [0001] The invention relates to a device capable of effectively preventing relatively large arcs from being generated between moving and static contacts of a circuit breaker when breaking a short-circuit current, and belongs to the technical field of switches. Background technique [0002] Molded case circuit breakers (MCCB) and universal circuit breakers (ACB) are important electrical components in industrial and civil low-voltage power distribution equipment, and are mostly used as branch switches or main switches of low-voltage power distribution systems. At present, both domestic and foreign MCCBs and ACBs use arc extinguishing chamber technology to cool and extinguish the high-temperature and high-voltage arc generated when breaking the short-circuit current. After the arc is generated and stretched to a certain length, and the energy is amplified accordingly, the high-energy arc is driven into the arc extinguishing chamber by magnetic field electromotiv...

AI Technical Summary

Problems solved by technology

The arc extinguishing effect of this method is affected by factors such as the material of the arc extinguishing chamber, the breaking speed of the contacts, the distance between the contacts, the material of the contacts, etc., especially for the MCCB with a single break point structure, its ability to break the short-circuit current is relatively Poor, generally no more than AC 400V, ACB: 50~80kA, MCCB: 30~50kA, if this performance parameter is further improved, the manufacturing cost will increase significantly

Moreover, the DC short-circuit current is more difficult to break because there is no zero-crossing process.

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