To improve the research method of circuit breaker with oil dashpot with separation model

the integratedmodel coupled with machine-electric-magnetic-flow of circuit breaker with oil dashpot is established. The dynamiccharacteristics of circuit breaker with oil dashpot under different current conditions are analyzed by ADAMS

andthe validity of the simulation model is verified by experiments. In order to increase the average breaking speed of thecircuit breaker with oil dashpot

the model is parameterized

and four variables are designed and analyzed

includ-ing the X

Y coordinates of the static contact

the spring stiffness at dynamic contact arm and the initial force. The av-erage breaking speed and the sensitivity can be measured when each separate variable changes. Then optimizing thethree most influential variables to the breaking speed using the optimization function

calculating the breaking speedwhen the three variables are in different values in their own range. Finally

the maximum breaking speed and the val-ues of the variables are available

thus the breaking speed of circuit breaker has been improved and the breaking ca-pacity of mechanism has been optimized.