A compressed gas arc extinguishing device and a high-voltage circuit breaker using the arc extinguishing device

Abstract

The invention relates to a compressed air arc extinguishing device and a high-voltage circuit breaker using the arc extinguishing device. One of the compressed air arc extinguishing devices includes dynamic and static arc contacts, spouts, air cylinders and static contact seats. The arc starting ends of the two arc contacts all have butt conductive end faces facing each other that are press-fitted in the closed state. , the static arc contact moves along the direction of opening and closing through the conductive rod and is assembled on the static contact seat and is electrically connected with the static contact seat. There is an overtravel spring between the static arc contact and the static contact seat, and the conductive rod There is a static arc contact anti-off structure on the top; at least one of the two arc contacts is provided with an axial through hole, and the end of the axial through hole away from the butt conductive end face communicates with the air chamber outside the cylinder through a communication channel; the nozzle has The gap fit section is used to maintain a gap fit with the corresponding outer peripheral surface of the static arc contact during the opening and closing stroke. At least one of the static and dynamic arc contacts is surrounded by an arc suppression coil. The arcing contacts of the compressed air arc extinguishing device have less wear and lower coaxiality requirements.

Description

technical field [0001] The invention relates to a compressed air arc extinguishing device and a high-voltage circuit breaker using the arc extinguishing device. Background technique [0002] Common non-vacuum high-voltage circuit breakers are generally compressed air arc extinguishing devices, which adopt the blowing arc extinguishing method, relying on the relative movement of the compressed air cylinder and the piston to make high-pressure gas eject from the nozzle to blow off the arc. For example, a Chinese patent with application number 201020609730.9 and authorized announcement date of 2011.06.08 discloses an outdoor high-voltage AC porcelain column SF 6 A circuit breaker includes a housing, a static end assembly and a moving end assembly. The static end assembly includes a static contact seat, a static main contact and a static arc contact installed on the static contact seat. The moving end assembly includes a fixed and The pressure cylinder, the moving contact seat,...

AI Technical Summary

Problems solved by technology

However, when the switch is closed, the moving arc contact moves toward the static arc contact and is sleeved on the static arc contact. At the same time, the nozzle is also sleeved on the static arc contact. The air flow channel formed by the opening at the front end of the head is blocked by the static arc contact. When opening, the air flow channel at the moving arc contact is officially opened only when the static arc contact leaves the moving arc contact and starts to pull the arc. Then The airflow channel of the nozzle is opened. Since the two airflow channels are blocked in the initial stage of opening, the reverse force of gas compression and the force of the arc will be concentrated together, resulting in a large amount of operating work required in the initial stage of opening. The structural performance and operating device of the arc extinguishing device have high requirements

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