Vacuum circuit breaker solid-sealed polar pole

Abstract

The invention discloses a vacuum circuit breaker solid-sealed polar pole which structurally comprises a bolt 1, silicone rubber 4, a lower leading-out terminal 5, an upper leading-out terminal 7, a vacuum arc extinguish chamber 8, an insert 11, a fixing flange 12 and an insulating body 13. The vacuum circuit breaker solid-sealed polar pole has the advantages that the vacuum arc extinguish chamber is convenient to replace, and the defect that the whole solid-sealed polar pole is scrapped when the solid-sealed polar has a problem; the upper leading-out terminal and the vacuum arc extinguish chamber are in contact and connected in a tooth-shaped meshed and contact mode, the vacuum arc distinguish chamber is fixed to the insert of the insulating body by the bolt through the fixing flange, the contact pressure of the upper leading-out terminal and the conduction contact face of the vacuum arc extinguish chamber is ensured, the conduction contact area and the current carrying capacity of a conduction circuit are improved, and the resistance of the conduction circuit is reduced; a vacuum layer is arranged between the insulating body and the vacuum arc extinguish chamber, it is ensured that the external insulation of the vacuum arc extinguish chamber is not affected by the external environment, the insulation performance of the solid-sealed polar pole is improved, and compared with the technology that the whole vacuum arc extinguish chamber is wrapped by silicon, more production cost is lowered.

Description

technical field [0001] The invention relates to a solid-sealed pole of a power transmission and distribution vacuum circuit breaker, which belongs to the technical field of power transmission and distribution switchgear. Background technique [0002] According to statistics, since 2002, my country has entered the ranks of vacuum circuit breaker powers after the United States, Germany and Japan. The reason why vacuum circuit breakers are so brilliant is inseparable from the continuous progress of vacuum circuit breaker technology. The solid-sealed pole technology is the embodiment of the great progress of the vacuum circuit breaker technology. The pole insulation of the vacuum circuit breaker has experienced air insulation-composite insulation-solid insulation. This forms the three generations of vacuum circuit breakers. [0003] The existing solid-sealed pole adopts epoxy resin as the insulating medium, and uses epoxy resin to seal the vacuum interrupter of the primary co...

AI Technical Summary

Problems solved by technology

However, there are still the following problems in the application process of the solid-sealed pole: first, because the vacuum interrupter of the primary conductive part and the current-carrying elements such as the upper and lower outlet terminals are all sealed into one, when the solid-sealed pole has a problem, the phase will be solidified. The sealing poles are all scrapped, that is, the current-carrying components such as the upper and lower outlets must be replaced, so the maintenance cost is high; second, due to the large difference in shrinkage between the vacuum interrupter and its current-carrying components and epoxy resin, And the adhesion between the two is not very good. When subjected to the temperature change of the external environment and the heat and temperature rise generated by the action of the electric field, it is easy to crack and cause insulation breakdown. Therefore, the vacuum must be extinguished before sealing. The arc chamber is coated with silica gel to form a silicone rubber buffer layer, so the production process is complicated and the cost of equipment purchase is increased

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