Investigations on Electromagnetic Operating Mechanism of DC Vacuum Circuit Breaker

Breaking capacity of DC circuit breaker is one of the important technical indicator, breaking performance of operating mechanism restricting its development. DC vacuum circuit breaker based on the principle of force zero-cross in electric power system, short-circuit current can be effectively breaking circuit. Mult- breakers in series with excellent insulating capacity of short vacuum gap improve the ability to withstand voltage insulation. Therefore, short stroke and fast opening of operating mechanisms are need to design and research. Electromagnetic repulsion operating mechanism mainly includes repulsion opening part, permanent magnetic closing part, overtravel spring holding part and capacitor charging and discharging driving part. Through the modeling and simulation of electromagnetic field of electromagnetic repulsion operator, analysis the capacitor discharge current, Multi-function press machine and mechanical characteristic analyzer tester are used to test electromagnetic repulsion operator movement characteristics with stress and displacement. Test measured operating mechanism analysis the movement characteristics in different drive capacitance voltage, analysis movement speed and mechanical bounce in the security and whole clearance between break contact, which test data can satisfy the application of DC circuit breaker with rapid and reliablity.