A high-speed double-break magnetic blowing middle-pressure great electric current direct current current-limiting circuit breaker

Abstract

The invention relates to a highs-peed dual-cut magnetic blow middle-voltage large-current direct-current limit chopper, wherein via spring connecting rod, it can synchronously bidirectional open the contactor of dual-cut chopper; via four-contactor conductive, it can time the initial electric repulsion force in short circuit, to realize high-speed gate and limit current; and via magnetic blow winding and extinguishment grid plate, it can prolong electric arc and accelerate arc into grid plate; since the electric arc has special path, it can cool arc in grid plate and avoid fly arc.

Description

technical field [0001] The invention relates to a current-limiting technology applied to a medium-voltage and high-current DC circuit breaker, in particular to a high-speed double-break magnetic blow medium-voltage and high-current DC current-limiting circuit breaker. Background technique [0002] Due to the unique advantages of the DC grid structure, there is a tendency to transition from the traditional low-voltage AC radial network to the AC medium-voltage AC / DC ring network in the field of ship power. Therefore, research on DC power systems and supporting equipment has become a worldwide hotspot. For the DC power grid, the lack of DC circuit breakers makes it one of the important links in the study of DC network protection actions. And with the increase of grid capacity, the large increase in the short-circuit current caused puts forward higher requirements for the current limiting capacity of the DC circuit breaker. [0003] The application of current-limiting breakin...

AI Technical Summary

Problems solved by technology

For the traditional single pair of dynamic and static contacts, the method of increasing the breaking speed of the contacts through high-speed mechanisms such as permanent magnet mechanisms and repulsion mechanisms has a limited increase in speed. If it is to be further improved, the circuit breaker mechanism will be complicated and the volume will be greatly increased, which cannot meet the requirements. The general requirement for a circuit breaker with a compact structure

The traditional method of magnetic blowing coil is one-way magnetic blowing, and the arc accelerates linearly under the action of the magnetic field. Under the condition of medium voltage and high current, it will cause difficulty in eliminating ionization outside the grid, serious arcing phenomenon, or the volume of ionization equipment increase

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