DC (direct current) circuit breaker rapid operating mechanism with current limiting characteristic

Abstract

The invention discloses a DC (direct current) circuit breaker rapid operating mechanism with the current limiting characteristic, which comprises a fixed contact and a moving contact. The fixed contact and the moving contact are kept in electrical connection in a switching-on state. The moving contact is fixed on a lower busbar by a rotating shaft and a compressed switching-off spring is arrangedat the lower side of the moving contact. A bump at the middle part of the moving contact is clamped in a notch of a shifting fork push rod to take a limiting effect so as to ensure the shifting fork push rod not to move. One side of the moving contact is provided with a switching-off coil and a repulsive force disk and the repulsive force disk is connected with a connecting rod. The side of the connecting rod, which is close to the moving contact, is provided with a crank arm, the crank arm can rotate around a fixed rotating shaft and one arm of the crank arm is connected with the connecting rod by a straight line through hole. The DC circuit breaker rapid operating mechanism is characterized in that when a circuit breaker is switched off, the repulsive force disk drives the connecting rod to move to trigger a release so that the moving contact starts to move, and simultaneously, the connecting rod drives the crank arm to rotate and is collided with the moving contact, so that the moving speed of the moving contact is fastened and the on-off characteristic of the circuit breaker is improved. The DC circuit breaker rapid operating mechanism has ingenious structure design, simple structure and reliable performances.

Description

technical field [0001] The invention belongs to the field of electrical machinery, and relates to a quick operating mechanism of a DC circuit breaker, in particular to a quick operating mechanism of a DC circuit breaker with current limiting characteristics, which utilizes the motion energy of a repulsive disk for auxiliary breaking. Background technique [0002] In recent years, DC power supply systems in my country's subways, light rails, ships, solar energy and other fields have developed rapidly. In order to meet the protection requirements in DC power distribution systems, the development of fast DC switches has become an inevitable trend. When a short-circuit fault occurs in the DC power supply system, the short-circuit current will quickly reach a peak value and oscillate to finally reach a steady-state value. The electrodynamic effect and thermal effect produced by the huge short-circuit current will cause serious damage to the electrical equipment in the system. If...

AI Technical Summary

Problems solved by technology

[0005] The technical purpose of the present invention is to overcome the technical problem in the prior art that the DC circuit breaker operating mechanism cannot meet the design requirements for faster and more reliable breaking

At the same time, it also solves the technical problem that the energy of the repulsion disk cannot be effectively used during the use of the ordinary electromagnetic repulsion mechanism; it provides a method that can effectively use the energy of the repulsion disk movement, speed up the rigid separation speed of the moving contact, and reduce the load on the mechanical structure of the release. Electromagnetic repulsion mechanism of DC circuit breaker to improve breaking performance of circuit breaker

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