Push-type circuit for fast repulsion mechanism

Abstract

The invention relates to a push-type circuit for a fast repulsion mechanism. The circuit comprises an opening loop, a closing loop and a controller, wherein the opening loop and the closing loop respectively drive a metal repulsion disc to drive a circuit breaker opening mechanism to open and close, the controller is used for respectively controlling the on-off of the opening loop and the closingloop, and the pushing force generated by the opening loop and the pulling force generated by the closing loop are on the same axis. Compared with the prior art, the push-type circuit has the advantages of fast action, small volume, low cost, safe operation and the like.

Description

Technical field [0001] The invention relates to the field of high-voltage DC circuit breakers, in particular to a push-type circuit used for a rapid repulsion mechanism. Background technique [0002] Mechanical high-voltage DC circuit breakers are used to break fault currents and normal load currents in DC or DC networking systems. Since there is no current zero-crossing point for direct current, mechanical high-voltage DC circuit breakers need to create an artificial current zero-crossing point, and the arc can be extinguished at the zero-crossing point. In order not to reignite the arc, the mechanical high-voltage DC circuit breaker must be sufficiently large at the current zero crossing point. The larger the distance, the easier it is to extinguish the arc. [0003] The opening distance of the mechanical high-voltage DC circuit breaker is realized by using a fast electromagnetic repulsion mechanism as the operating mechanism. The current fast electromagnetic repulsion mechani...

AI Technical Summary

Problems solved by technology

When the opening distance, that is, the opening distance reaches a certain necessary distance, the mechanism needs to be equipped with a buffer mechanism to absorb excess energy. Otherwise, the mechanism will forcibly stop after reaching the opening distance, which will seriously impact the overall mechanism and greatly affect the service life of the mechanism.

[0005] At present, if the fast electromagnetic repulsion mechanism is to achieve a larger opening distance at the artificial current zero-crossing point of the mechanical high-voltage DC circuit breaker, it needs to figure 1 The capacitance of the opening capacitor C1 is increased or the charging voltage of C1 is increased, but this will make the capacitor large, and the control cabinet of the fast electromagnetic repulsion mechanism where the capacitor is placed is large; the energy of the capacitor is converted into energy when the opening mechanism operates The conversion efficiency is low, increasing the charging voltage of the capacitor can increase the opening distance, but the effect is limited

In addition, the increase in capacitance and the increase in the charging voltage of the capacitor can directly lead to an increase in the movement speed of the opening mechanism, but at the same time, the buffer mechanism needs to do more work to absorb the excess energy generated by the accelerated movement after the current crosses zero.

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