Short-circuit current self-driven current-limiting direct-current circuit breaker

Abstract

The invention discloses a short-circuit current self-driven current-limiting direct-current circuit breaker. The short-circuit current self-driven current-limiting direct-current circuit breaker comprises a short-circuit current self-driven fast switch, a self-induction trigger, a voltage-limiting energy-absorbing assembly, a diode which is in anti-parallel connection with the fast switch, pulse switches which are connected with the cathode of the diode, a pulse capacitor of which one end is connected with one pulse switch, a current-limiting resistor connected with the other pulse switch and a pulse inductor of which one end is connected with the other end of the pulse capacitor. The other end of the pulse inductor is connected with the anode of the diode, one end of a charging contactor is connected with a positive inlet side of the circuit breaker, and the other end of the charging contactor is connected with one end of a fuse; the other end of the fuse is connected to one pole of the pulse capacitor, and the other end of the pulse capacitor is connected to the negative pole of the circuit breaker through the current-limiting resistor. According to the present invention, the rapid opening and the commutation current input are realized, and a commutation assembly is hung on a system for floating charging after being pre-charged, so that the composition is simple, the structure is novel, the response speed is higher, the disconnection is more reliable, and the current limiting effect is more prominent.

Description

technical field [0001] The invention belongs to the technical field of switching appliances, and in particular relates to a current-limiting DC circuit breaker self-driven by short-circuit current. Background technique [0002] Forced-commutation DC vacuum circuit breakers are usually mainly composed of vacuum switches, pre-charged LC commutation circuits, MOV-based voltage-limiting energy-absorbing components, and fault detection and timing controllers. When the fault is broken, the current is detected by the current sensor. After the fault is judged by the logic controller, the vacuum switch is triggered to open quickly, and the commutation circuit is triggered at an appropriate time. A zero-crossing point is created in the vacuum switch, and the current is transferred to the commutation circuit to establish Overvoltage, the MOV is used to limit the voltage and absorb energy, and finally realize the current breaking. Forced-commutation DC vacuum circuit breakers can break...

AI Technical Summary

Problems solved by technology

The forced commutation type DC vacuum circuit breaker can break a large short-circuit current and has a good application prospect. It has high requirements for the fast response of the mechanical switch and its high-frequency breaking capacity. Its main disadvantage is that there are many commutation circuits and its auxiliary equipment. , the complex control

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