126kv column vacuum circuit breaker with high current carrying capacity

Abstract

A 126 kV column type vacuum circuit breaker with a high current carrying capacity comprises a porcelain sleeve serving as an insulating supporting column. A 126 kV vacuum arc extinguishing chamber is arranged in the porcelain sleeve, a static conducting rod and a movable conducting rod are arranged at the two ends of the vacuum arc extinguishing chamber respectively, an upper conducting flange is arranged on the upper portion of the static conducting rod, a conducting base is arranged around the movable conducting rod, and a lower conducting flange is arranged below the conducting base; a special BAL SEAL bus adapter is adopted to achieve conducting connection between the movable conducting rod and the conducting base; an upper heat dissipation device is arranged above the upper conducting flange, and lower heat dissipation devices are arranged above and below the lower conducting flange respectively; a cavity formed by the vacuum arc extinguishing chamber, the conducting connecting pieces of the vacuum arc extinguishing chamber and the inner wall of the porcelain sleeve is filled with a gas insulating medium. By shortening the conducting path, designing the special BAL SEAL bus adapter, adopting FK33 heat conduction grease and designing the efficient heat dissipation devices, the main circuit resistance is controlled and reduced, the heat dissipation efficiency is improved, and the current carrying capacity of the 126 kV column type vacuum circuit breaker can be significantly improved.

Description

technical field [0001] The invention relates to a 126kV column-type vacuum circuit breaker, in particular to a 126kV column-type vacuum circuit breaker with high current-carrying capacity, and belongs to the technical field of high-voltage electrics. Background technique [0002] In circuit breakers with a voltage level of 126kV and above, the current SF 6 Circuit breakers are absolutely dominant. like Figure 7 As shown, the pole of the arc extinguishing chamber of the existing SF6 circuit breaker includes a porcelain sleeve (11), a static contact seat (12), a nozzle (13), a static arc contact (14), a contact finger (15), a moving arc Contact (16), thermal expansion cylinder (17), tie rod (18), intermediate contact (19), lower support seat (20), the pole of the arc extinguishing chamber of the above SF6 circuit breaker is extinguished by using the arc extinguishing performance of SF6 arc. But SF 6 Gas is the gas with the strongest greenhouse effect among the six greenho...

AI Technical Summary

Problems solved by technology

High-voltage vacuum circuit breakers have outstanding ability to break short-circuit currents, but at voltage levels of 126kV and above, due to the significant increase in the height of the vacuum interrupter and the good thermal insulation of the vacuum, it is difficult to increase the current-carrying capacity of the vacuum circuit breaker ( Currently at 2500A and below)

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