A liquid metal circuit breaker

Abstract

The invention discloses a liquid metal breaker. The liquid metal breaker comprises a sealing cavity consisting of a first conducting bar, a second conducting bar and an insulating outer wallboard and liquid metal filled in the sealing cavity, and further comprises an operating mechanism installed outside the sealing cavity. The sealing cavity is internally provided with an insulating partition. The insulating partition divides the sealing cavity to two independent chambers. The insulating partition is provided with through-flow holes communicated with two chambers. The free surface of the liquid metal exceeds the outer edge of the through-flow holes. The chamber is internally provided with an insulating cutting plate matched with the through-flow hole. The insulating cutting plate is connected with the operating mechanism by a pull rod. While the short trouble is detected, the operating mechanism is quickly operated, the pull rod pulls the insulating cutting plate to be adhered to the through-flow holes, and the liquid metal in the through-flow holes is extruded, so the through-flow resistance is quickly increased, the liquid metal in the through-flow holes is completely discharged finally, and the electric current is broken. Compared with the self-constriction liquid metal current limiter, the rated flow capacity of the liquid metal breaker is stronger.

Description

technical field [0001] The invention belongs to the technical field of power switches, and in particular relates to a liquid metal circuit breaker installed in a power system as a control and protection device for conducting and breaking the system. Background technique [0002] With the research and promotion of DC power transmission and distribution, the demand for medium and high voltage DC circuit breakers is increasing day by day. At present, the medium and high voltage DC circuit breakers that have been studied more mainly include hybrid DC circuit breakers and solid state circuit breakers. [0003] The hybrid DC circuit breaker combines the advantages of mechanical switches and semiconductor switches, and has the advantages of strong current capacity and no or less arcs in the breaking process, but its breaking process is more complicated, which reduces the overall reliability. Solid-state circuit breakers have the advantages of fast breaking and no arc, but the rate...

AI Technical Summary

Problems solved by technology

[0006] Liquid metal circuit breakers have simple structure, high reliability, and low economic cost. Therefore, their popularization and application in medium and high voltage DC power systems can greatly reduce economic costs on the basis of ensuring breaking reliability. Currently, the common self-shrinking liquid metal circuit breakers Metal current limiters, when used in AC power systems and other occasions, their rated current capacity is still insufficient and cannot meet actual needs

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