A Novel Control Strategy of Phase-Controlled Switching Technology for Vacuum Circuit Breaker

The opening and closing of a vacuum circuit breaker in the selected phase of the system voltage and the associated electrical equipment plug in or disconnect the electrical system with minimal impact on itself and the system. To realize this and ensure the control precision and stability of its action process, this study designs the drive motor and controller of a vacuum circuit breaker actuator. Additionally, a new function-switching pseudo-differential control (FPD) strategy is based on the feedback element principle. The control strategy avoids the direct differentiation of the controlled variables and has the ability of a fast dynamic response and anti-interference. At the same time, according to the moving process of the circuit breaker contacts, the control parameters are directly assigned to the system in stages, which reduces the amount of calculation and enhances the response speed of the control system. According to the research on the motor actuator movement process, the motor actuator and its control system of a 40.5 kV vacuum circuit breaker are developed and verified by closing operation in the selected phase, and the experimental results show the effectiveness of the proposed control strategy.