The design and experimental analysis of high-speed switch in 1.14kV level based on novel repulsion actuator

The electromagnetic repulsion actuator is a novel high-speed one based on the principle of eddy current. Its driving equipment is mainly composed of coils and repulsion dish. Its main characteristics are the short energizing time, high speed movement and the ability that can drive the switch to cut off the faults in power grid within a very short time. In this paper, an improved repulsive force driver is proposed, which realizes high speed motion and energy conservation by cooperating with the permanent magnet holding device. The novel switch has simple structure, and the holding force in open/close position is enhanced, which can guarantee the reliability of switch motion by effectively preventing bounce when the contacts move from one position to the other. What's more, the mechanical strength of the coil is enhanced by setting it into a pure iron frame. A 1.14kV level prototype is made based on the idea mentioned above. In the experiment, a high-speed camera is used to rapidly collect images of the repulsive dish's open/closing motion and the whole process of the movement. The characteristic of the repulsive force actuator is induced by the statistics and analysis of the experimental data which is obtained by image recognition technology. Through the research of the ‘two-time continuous discharge experiment’ on the opening coil prototype by controlling the capacitors, it shows that this method can effectively shorten the movement time, and has more obvious advantages than one coil discharge.