A universal circuit breaker with arc extinguishing performance

Abstract

A universal circuit breaker with powerful arc extinguishing performance includes a static contact, a moving contact and an insulating arc extinguishing mechanism which are arranged in a circuit breaker housing. The insulating arc extinguishing mechanism includes an insulating shielding plate, armatures, a magnetic yoke, slide rods, and pressure springs. The magnetic yoke is fixed to one side of the static contact of the circuit breaker and is lower than the contact surface of the static contact and the moving contact. The insulating shielding plate and the armatures are located on the other side of the static contact. The insulating shielding plate is fixed on the armatures, and corresponds to the gap between the static contact and the moving contact of the circuit breaker. One end of each slide rod is fixedly connected with the magnetic yoke, and the other end is screwed into an anti-off nut after passing through the corresponding pressure spring and the corresponding armature. The insulating shielding plate can be quickly inserted between the moving contact and the static contact when the circuit breaker cuts off a short-circuit current, to extinguish the arc between the moving and static contacts. Thus, the circuit breaker has short or no flashover, the ability of the circuit breaker to cut off an AC / DC short-circuit current is greatly improved, and the application scope of the circuit breaker is expanded.

Description

technical field [0001] The invention relates to an AC and DC universal universal circuit breaker with strong short-circuit current breaking capacity, belonging to the technical field of emergency protection devices. Background technique [0002] Universal circuit breaker (ACB) is an important electrical component in industrial and civil low-voltage power distribution equipment. Among them, short-circuit fault protection is its most important function. Since the short-circuit current of the line is very large during a short-circuit fault, when the circuit breaker breaks the short-circuit current, a plasma arc with high energy will be generated between the moving and static contacts. These technical measures can quickly extinguish the arc, and the circuit breaker can complete the task of breaking the short-circuit current. [0003] At present, both domestic and foreign ACBs use arc extinguishing chamber technology to cool and extinguish the high-temperature and high-voltage a...

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. Relatively poor, generally no more than AC 400V, 50-80kA, if this performance parameter is further improved, the manufacturing cost will increase significantly

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

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