Operating mechanism of high-voltage circuit breaker

Abstract

Provided is an operating mechanism of a high-voltage circuit breaker. The operating mechanism of the high-voltage circuit breaker is characterized by comprising a cylindrical permanent magnet linear motor and a transmission mechanism. The cylindrical permanent magnet linear motor comprises a primary iron core, a shell body, a secondary portion and an armature winding, wherein an air gap exists between the secondary portion and the primary iron core, the secondary portion obtains electromagnetic push-pull force in the axial direction of the primary iron core through coupling between a magnetic field of the air gap and the armature winding, the input end of the transmission mechanism is hinged to a shaft of a secondary iron core, and the output end of the transmission mechanism is connected with a moving contact of an arc chute of the high-voltage circuit breaker. Due to the facts that the secondary iron core generates electromagnetic thrust and achieves linear motion according to the electromechanical energy conversion principle, the secondary iron core is connected with the arc chute of the high-voltage circuit breaker through the transmission mechanism, and the linear speed of the cylindrical permanent magnet linear motor is increased through the reasonable transmission ratio, the rated thrust of the cylindrical permanent magnet linear motor is reduced. The operating mechanism of the high-voltage circuit breaker has the advantages of being simple in structure and high in reliability, switch-on and switch-off of the high-voltage circuit breaker can be controlled through an inverter in a targeted mode, control over the speed characteristic of the process of switch-on and switch-off is achieved, and controllability of the high-voltage circuit breaker is improved.

Description

technical field [0001] The invention belongs to the technical field of electric appliances in electric power engineering, and in particular relates to an operating mechanism of a high-voltage circuit breaker. Background technique [0002] As an important switching electrical component in the power transmission and distribution system, the high-voltage circuit breaker plays a dual role of control and protection. The operating mechanisms of traditional high-voltage circuit breakers mainly include spring, pneumatic, hydraulic and electromagnetic operating mechanisms, but they all have their own defects. For example, the spring operating mechanism relies on the energy stored in the spring to release the circuit breaker. Its There are many parts and the manufacturing process is complicated, which is easy to cause mechanical failure. Pneumatic and hydraulic systems have complex structures, low reliability, and high processing technology requirements for hydraulic operating mechan...

AI Technical Summary

Problems solved by technology

The operating mechanisms of traditional high-voltage circuit breakers mainly include spring, pneumatic, hydraulic and electromagnetic operating mechanisms, but they all have their own defects. For example, the spring operating mechanism relies on the energy stored in the spring to release the circuit breaker. Its There are many parts and the manufacturing process is complicated, which is easy to cause mechanical failure

Pneumatic and hydraulic systems have complex structures, low reliability, and high processing technology requirements for hydraulic operating mechanisms. Oil leakage is likely to occur if manufacturing or assembly is poor, and its speed characteristics are easily affected by ambient temperature. The quality of compressed air has a great impact on pneumatic operation. The reliability of the mechanism has an important impact. Once the air is damp, the surface of the piston and cylinder will be rusted.

The structure of the electromagnetic operating mechanism has problems such as large driving power, small contact force and easy contact jumping when closing.

Spring and electromagnetic operating mechanisms cannot meet the operating requirements of high-power, long-stroke high-voltage circuit breakers, and are currently mainly used in circuit breakers with lower voltage levels

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