Vacuum circuit breaker

Abstract

The invention discloses a vacuum circuit breaker. The vacuum circuit breaker comprises an upper wiring terminal, a solid-sealed pole post, an operating mechanism box, a lower wiring terminal and a strut insulator, wherein the solid-sealed pole post comprises a vacuum arc extinguishing chamber and a shell, a heat sink is arranged on the upper wiring terminal, a cooling layer is arranged on an outersurface of the operating mechanism box, the vacuum arc extinguishing chamber comprises a fixed plate and a plurality of arc extinguishing sheets, the fixed plate comprises a bottom plate, a first side plate and a second side plate, the first side plate and the second side plate are respectively arranged at two sides of the bottom plate, the plurality of arc extinguishing sheets are arranged in parallel between the first side plate and the second side plate, two sides of an arbitrary arc extinguishing sheet are respectively fixed at the first side plate and the second side plate, a gap is formed between two adjacent arc extinguishing sheets, a plurality of first ventilation holes are formed in the first side plate and communicate with the gap, and a plurality of second ventilation holes are formed in the second side plate and communicate with the gap. The vacuum circuit breaker is good in cooling performance, and ablation to a metal conductor is reduced.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a vacuum circuit breaker. Background technique [0002] "Vacuum circuit breaker" is named because the arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are high vacuum; it has the advantages of small size, light weight, suitable for frequent operation, and no maintenance for arc extinguishing. It is widely used in power grid. Vacuum circuit breaker is an indoor power distribution device in 3-10kV, 50Hz three-phase AC system, which can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations, especially suitable for oil-free, less In places where maintenance and frequent operations are used, circuit breakers can be configured in central cabinets, double-layer cabinets, and fixed cabinets to control and protect high-voltage electrical equipment. [0003] Vacu...

AI Technical Summary

Problems solved by technology

Existing arc extinguishing chambers are usually exhausted by setting vent holes at the bottom. When the product is short-circuited, the arc rushes to the middle of the arc extinguishing chamber at the same time, which is likely to cause front and rear breakdown and burn out the product.

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