Abstract
Aiming at the arc interruption problem in aviation 270 V DC power systems, this report proposed new contact types of vacuum interrupter contacts with curved surfaces for high-frequency forced interruption. The characteristics of vacuum arc behavior, high-frequency forced interruption capacity and contact surface ablation under curved contact with different structural parameters are investigated. The interruption ability, arc voltage characteristics and contact ablation of CuW80 and CuCr25 contact materials and their differential combinations were obtained. To select the optimal structural parameters of the curved contacts, a method based on the curvature of the electrode surface was proposed for high-frequency forced interruption under a short-gap vacuum arc. Experimental results show that a current of 4.8 kA can be interrupted at a commutation frequency of 20 kHz with a di/dt of 650 A/μs when the curvature of curved contacts is in a certain range.
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