Miniaturized large-current handcart-type vacuum circuit breaker

Abstract

The invention relates to a miniaturized large-current handcart-type vacuum circuit breaker, which comprises a frame main body, three-phase vacuum circuit breaking poles, a synchronizing shaft and auxiliary contacts of the synchronizing shaft. The three-phase vacuum circuit breaking poles are arranged at the upper part of the frame main body. The synchronizing shaft and the auxiliary contacts of the synchronizing shaft are arranged in a metal frame. Each of the three-phase vacuum circuit breaking pole is provided with a vacuum arc extinguishing chamber, an insulated pull rod and a permanent magnet operating mechanism which are longitudinally and sequentially arranged from top to bottom. The vacuum arc extinguishing chamber comprises an upper wiring terminal, a lower wiring terminal, a corrugated pipe and a ceramic chamber. The corrugated pipe is arranged outside the ceramic chamber and is connected with the lower end of the ceramic chamber. One end of the insulated pull rod is connected with a movable contact. The movable contact is matched with the corrugated pipe. The other end of the insulated pull rod is connected with the permanent magnet operating mechanism. The three-phase permanent operating mechanisms of the three-phase vacuum circuit breaking poles are respectively connected with the synchronizing shaft. The miniaturized large-current handcart-type vacuum circuit breaker has the advantages of small size, light weight, long service life, maintenance-free, high flexibility and convenience in use.

Description

[0001] technical field [0002] The invention belongs to high-voltage switchgear and is suitable for various handcart switch cabinets. It is used to close, carry and break the normal current of the operating circuit, and can also close, carry and break the specified overload current (including short-circuit current) miniaturized high-current handcart-type vacuum circuit breaker. Background technique [0003] Traditional vacuum circuit breakers are generally arranged front and back: the front is a three-phase vacuum circuit breaker, and the rear is an operating mechanism. The required operating work is carried out by a transmission mechanism that transmits the kinetic energy of a mechanism to the three-phase moving contacts of the vacuum circuit breaker. The transmission system includes opening coils, energy storage motors, mechanical locks, gears, chains, and connecting rods. and other components, the structure and transmission process are extremely complicated, the volume ...

AI Technical Summary

Problems solved by technology

During the opening and closing process of the stamping bellows in the interrupter, the extremely high acceleration will generate huge pressure on the bellows. After long-term operation, the peaks are prone to fatigue, resulting in chronic leakage of the interrupter, making the vacuum of the vacuum interrupter drop and not work properly

[0007] In order to be able to solve the problem of increased related costs due to excessive volume and other cost increases due to manufacturing processes, it is necessary to develop a small, high-current vacuum circuit breaker with stable operation and long life.

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