Two-stage acceleration permanent magnetic mechanism used for high-voltage large-open-distance vacuum circuit breaker

Abstract

The invention discloses a two-stage acceleration permanent magnetic mechanism used for a high-voltage large-open-distance vacuum circuit breaker, and belongs to the field of high-voltage vacuum circuit breakers. The two-stage acceleration permanent magnetic mechanism comprises an auxiliary starting mechanism, a main operating mechanism and a guide rod connected with a moving contact of the circuit breaker. The auxiliary starting mechanism comprises a first static iron core, a starting switch closing and opening coil, an auxiliary dynamic iron core and a push disc. The main operating mechanism comprises a second static iron core, an auxiliary switching opening coil, a main switch closing coil, a main switch opening coil, an inner magnetic ring, a permanent magnet and a main dynamic iron core. A gasket made of non-magnetic materials is arranged between the auxiliary starting mechanism and the main operating mechanism. Axial grooves are formed in the outer side wall of the main dynamic iron core and the outer side wall of the auxiliary dynamic iron core. According to the two-stage acceleration permanent magnetic mechanism, through the auxiliary starting mechanism, two-stage acceleration is conducted on the permanent magnetic mechanism with long stroke distance, working air gaps of magnetic fields of the coils are reduced, working switch opening and closing current is greatly reduced, and the starting speed of the dynamic iron cores is increased. The two-stage acceleration permanent magnetic mechanism can be designed into a round structure and a square structure according to specific operation requirements.

Description

technical field [0001] The invention relates to the field of high-voltage vacuum circuit breakers, in particular to a two-stage accelerated permanent magnet mechanism for high-voltage large-opening distance vacuum circuit breakers. Background technique [0002] With the advantages of small size, light weight, suitable for frequent operation, and no maintenance for arc extinguishing, vacuum circuit breakers quickly occupied the medium-voltage circuit breaker market and further developed into the high-voltage field. The operating mechanism of the vacuum circuit breaker usually has three types: electromagnetic type, spring type and permanent magnet type. Among them, the permanent magnet operating mechanism has attracted people's attention increasingly due to its advantages of high reliability, low energy consumption, maintenance-free, and synchronous operation. The high-voltage vacuum circuit breaker has a relatively large requirement for the opening distance. Taking the 126kV...

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Problems solved by technology

Moreover, due to the large stroke of the moving iron core, the air gap reluctance is very large when the moving iron core starts, which requires a large excitation current to be passed into the excitation coil, which causes a series of problems such as temperature rise and control.

These problems limit the application of permanent magnet mechanism in the field of high voltage vacuum circuit breaker

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