Abstract: A DC circuit breaker device is provided, including: a circuit breaker module including a first circuit breaker and a second circuit breaker connected in series with the first circuit breaker; a commutation module connected in parallel with the first circuit breaker and including a commutation capacitor, a commutation switch module and a commutation inductor connected in series; the commutation switch module including a commutation switch positive branch and a commutation switch negative branch; and a control module coupled to the circuit breaker module and the commutation module, and configured to control the switching on/off of the commutation switch positive branch and the commutation switch negative branch after the first circuit breaker is re-closed. A method of controlling a DC circuit breaker is also provided.

Abstract: A bidirectional transfer device, an RGV and a liquid injection apparatus are disclosed. The bidirectional transfer device includes a bidirectional transfer base, a bidirectional transfer arm assembly, a bidirectional transfer driving assembly, a bidirectional transfer auxiliary assembly, a bidirectional transfer auxiliary driving assembly, a transfer auxiliary fixing assembly and a first transfer positioning sensor. The bidirectional transfer driving assembly drives the bidirectional transfer arm assembly to move along a first direction and a second direction. The bidirectional transfer auxiliary assembly includes a bidirectional auxiliary push-pull component, a bidirectional transfer auxiliary mounting plate and an auxiliary lifting driver, and the bidirectional auxiliary push-pull component is connected to a liquid injection jig.

Abstract: A DC circuit breaker device is provided, including: a circuit breaker module including a first circuit breaker and a second circuit breaker connected in series with the first circuit breaker; a commutation module connected in parallel with the first circuit breaker and including a commutation capacitor, a commutation switch module and a commutation inductor connected in series; the commutation switch module including a commutation switch positive branch and a commutation switch negative branch; and a control module coupled to the circuit breaker module and the commutation module, and configured to control the switching on/off of the commutation switch positive branch and the commutation switch negative branch after the first circuit breaker is re-closed. A method of controlling a DC circuit breaker is also provided.