Oscillation transfer and solid-state switch combined direct-current circuit breaker

The invention provides an oscillation transfer and solid-state switch combined direct-current circuit breaker, which is composed of a main current loop, a current transfer branch, an energy absorptionbranch and a control system. According to the invention, under the condition of small current on-off, a high-speed mechanical switch is controlled to be switched off to be connected with a corresponding power electronic device, current is transferred to a current transfer branch under the action of arc voltage, and then the power electronic device is controlled to be switched off, voltage at thetwo ends of a power electronic assembly rises and a lightning arrester is controlled to be connected; when a large-current short-circuit fault occurs, the high-speed mechanical switch is controlled tobe switched off to be conducted with the power electronic device; and a pre-charging capacitor injects reverse current into the fracture, the fracture current is subjected to zero-crossing arc extinguishing, short-circuit current is transferred to the current transfer branch and charges the capacitor, and when the capacitor voltage is greater than the lightning arrester conduction voltage, the lightning arrester is conducted. The novel direct-current circuit breaker has the characteristics of simple structure, low on-state loss, high full-current breaking speed and the like.