Research on the control techniques of motor drive for SF6 high voltage circuit breaker

This paper investigated a new type of operating mechanism in which the high voltage circuit breaker (HVCB) is driven by a permanent magnet synchronous motor (PMSM). This type of mechanism has high reliability due to its simple mechanical structure. In addition, the operating process of the mechanism is controllable. In this paper, the control technique of PMSM was introduced. A simulation model of the motor control system was established in MATLAB/Simulink. A hardware system, which consists of a breaker, a PMSM and its control device based on TMS320F2812 DSP, was built to test the motor drive mechanism. A total digital position servo system was established by implementing the vector control algorithm in the DSP controller. The travel curve of the breaker could be controlled by controlling the movement of the motor. The simulations and tests indicated that the motion of the HVCB is well controlled and the motor drive mechanism can meet the requirements for opening and closing operation of HVCB.