Dynamic response of spring-type operating mechanism for 69 kV SF₆ gas insulated circuit breaker

This paper investigates the dynamic response of a spring-type operating mechanism for a 69 kV SF₆ gas insulated circuit breaker. This paper uses the equation of motion to analyze the dynamic response of the spring type operating mechanism. The basic theory behind the equation of motion is briefly introduced and the kinematic coefficients of the links and the centers of gravity of the spring-type operating mechanism are then derived. The non-linear differential equation of motion is then solved by using the fourth-order Runge-Kutta method. From these results, the duration of each operation is then calculated. It is shown that the closing time is 0.114 s and the opening time is 0.078 s which are comparable with those obtained experimentally. In addition, the dynamic response of the output moving contact has also been calculated and comments are made on its kinematic characteristics.