Simulation of the Motor Operating Mechanism Using Double-motion Technology

The motor operating mechanism helps to meet the requirement of intelligent operation of high-voltage circuit breakers. However, the current motor operation mechanism needs motors with low inertia and large torque to meet the opening and closing speed requirements, which limits the development of motor driving circuit breakers to high voltage level. In order to reduce the torque demand of the motor operating mechanism, this paper studied the feasibility of applying 252kV double-motion arc extinguishing chambers to the motor mechanism, and the relative displacement between two contacts and the torque curve during the opening and closing operation are calculated. The results show that the motor operating mechanism with double-motion mechanism can meet the speed requirements of the 252 kV circuit breaker. Compared with the single-motion mechanism, the demand for the maximum motor torque can be reduced by nearly 25%. The research shows that double-motion mechanisms help to reduce the torque requirements, which provides the possibility to apply the current motor driving circuit breakers to higher voltage levels.