Research On Motor Operating Mechanism Control System Of High Voltage Circuit Breaker

As one of the important parts of a circuit breaker, the operating mechanism is required to guarantee long-term operational reliability of the circuit breaker as well as to be beneficial to arc extinction. Operating arm of linear motor operating mechanism to be droved by linear motor to realize the opening and closing operation, by which the quicker response ability and the better performance can be gained. The research of this thesis concentrates on control scheme of linear motor operating mechanism. A feasible control strategy is proposed to realize matching between circuit breaker counterforce characteristic and actuator output force characteristic, and the intelligent opening and closing of high voltage circuit breaker is carried out with the method.At first, the development and characteristics of circuit breakers' operating mechanism in the past days is briefed and followed by an introduction to the new type of operating mechanism with basic structure and special requirement being elucidated. Matching between circuit breaker counterforce characteristic and actuator output force characteristic is discussed, and ideal movement contact curve calculated according to the characteristic of vacuum interrupters is given. Subsequently the control simulation model of linear servo motor mechanism is established. Mathematical model of single neuron intelligent PID is analyzed and adopted in the control system. Simulation has been carried out, the control and regulation on the moving contact movement during the opening and closing of the high voltage circuit breaker are realized which make the movement curve same as the ideal one. At last, linear-servo motor operating mechanism control system prototype for 40.5kV vacuum circuit breaker is manufactured. Control scheme is based on DSP, circuit of capacitance voltage charging, measuring, inverter and contact speed detecting are designed. The paper is completed in hardware circuit, emulation, the correlative programmer and arithmetic and debug. In the end, the function of motor operating mechanism control system was proved effective by experiment. The double closed-loop control scheme of speed and current of the moving contact is achieved during the opening and closing of the high voltage circuit breaker.The motor operating mechanism controller realizes the main function in design. The research and experiment result proves that: the design structure of motor operating mechanism control system is reasonable. And it not only realizes commonly function of traditional operating mechanism, but also make moving contact movement characteristic be controlled which make the movement curve same as the ideal one. So, it can build better foundation for fulfilling the true meaning intelligent operation of high voltage circuit breaker.