The Research On Technologies Of Synchronous Switching Based On PMA

the appearance of permanent magnetic actuator (PMA) brings about a better condition to complement the synchronous control technology for vacuum circuit breaker, the synchronous control of PMA is used widely in electric power system to control and reduce switching transients, increase the interrupting capacity of switches, improve the reliability of electric power system. Many people have paid attention to the research and application of synchronous control technology.On the premise of introducing the background knowledge of circuit breaker and its control technology and so on, we study and analyze the structure, working principle, static characteristics and dynamic characteristics of monostable permanent magnetic mechanism.This paper firstly expounds the process of synchronous closing and synchronous opening of the PMA, analyses the method of phase selecting and the technical element for synchronous closing; then the impact of pre-strike characteristic, environmental temperature and controlling voltage on synchronous closing and corresponding resolutions Was analyzed, at the same time, analyses how the synchronous closing reduce the value of over-current and over-voltage in the closing transient process.At last, on the basis of synchronous control technology, a synchronous control device for PMA is developed, and this controller cooperated with synchronized breaker with PMA accomplished the elementary verification.the experiment results indicate that the effect of synchronous controlling Can satisfy the requirement of controlling basically.