Breaker with forced flash barrier device

Abstract

The invention relates to a breaker with a forced flash barrier device. The breaker comprises a shell, a movable contact and a fixed contact, wherein the shell is internally provided with a lever made of an insulating material and composed of a left moment arm, a right moment arm and a fulcrum, the left moment arm of the lever is inserted into a gap between the movable contact and the fixed contact since the right moment arm is pushed rightwards by the movable contact during the separation process of the movable contact and the fixed contact, and the left moment arm of the lever goes out of the gap between the movable contact and the fixed contact since the left moment arm is pushed leftwards by the movable contact during the closing process of the movable contact and the fixed contact. The breaker is simple in structure and reliable in movement, can quickly cut off an electric arc when the movable contact and the fixed contact are separated so as to improve arc voltage, increase the breaking capacity and the current-limiting capacity of the breaker, widen the application range of the breaker and realize reversible protection.

Description

technical field [0001] The invention relates to a circuit breaker with a forced arc isolation device. Background technique [0002] In order to protect the safety of users' own electricity use, circuit breakers are usually installed in the power supply system as protective appliances. With the continuous improvement of the power industry and power consumption levels, the requirements for the performance, quality, and variety of circuit breakers are also getting higher and higher. , the reality urgently requires the development of circuit breakers with miniaturization and high breaking capacity. As we all know, during the breaking process of the circuit breaker, an arc will be generated between the moving contact and the static contact. Since the arc is conductive, if it cannot be extinguished in time, it will directly affect the breaking capacity and current limiting performance of the circuit breaker. Therefore, in order to improve the breaking capacity and current limitin...

AI Technical Summary

Problems solved by technology

However, it is difficult for the conventional grid-type arc extinguishing chamber to extinguish the arc in time, and various manufacturers are constantly improving the arc extinguishing method to increase the breaking capacity. On the one hand, it relies on the airflow to drive the arc into the grid; for the DC arc extinguishing system, some manufacturers use magnets to guide the arc into the arc extinguishing chamber to extinguish it, so as to solve the problem that the arc is difficult to cut off and extinguish between the contacts

Although the improvement of the above-mentioned arc extinguishing method can improve the arc extinguishing effect and improve the breaking capacity of the circuit breaker to a certain extent, it still cannot quickly break and extinguish the arc when the circuit breaker is broken, thus directly affecting the breaking of the circuit breaker. At the same time, the method of using magnet arc ignition in the DC arc extinguishing system will limit its application range, that is, the wiring method is limited, and reversible protection cannot be realized

Images