Development of a novel dc vacuum circuit breaker

A novel DC vacuum circuit breaker (VCB) is developed by means of current commutation. The main circuit¿s operations, opening and current transferring, are undertaken by two vacuum interrupters, which are connected to each end of a rod with a fixed-point in the middle of it. That means when a vacuum interrupter goes to open, another vacuum interrupter will go to close synchronously. The novel DC-VCB is driven by a permanent magnet actuator. This scheme is profitable to the opening speed, and the simplification of the current-transfer control. An electronic-driven system is used to inspect the real-time fault and lo control the actuator in this scheme. The novel DC-VCB system is also simulated in the paper. The experimental results prove the theory analysis, and indicate that the new structure can work exactly and quickly, and the scheme can he put into practice.