Modelling and analysis of a high-speed circuit breaker mechanism with a spring-actuated cam

Abstract

The dynamic model of a high-speed circuit breaker mechanism with a spring-actuated cam is derived, and its validation and appropriateness for an analysis of high-speed motion behaviour are checked through experiments. In particular, the characteristics of the friction on the camshaft are investigated using the non-linear pendulum experiment. The parameters of the friction model are estimated using an optimization technique. The analysis shows that the friction of the pendulum depends on stick± slip, the Stribeck eVect and viscous damping. The simulation results of derived dynamic models for the rapid closing and opening operations are compared with actual responses using a high-speed camera and are investigated to validate their usefulness. The spring motion, which has much in¯uence on the closing responses, is observed.

Optimal synthesis of a spring-actuated cam mechanism using a cubic spline

“…F riction torques T 1s and T 2s are assumed to be Coulomb friction and their values are estimated by experiment [10]. For the derivation of T 1c and T 2c , F ig.…”

“…The effect of gravity was ignored because the VCB system can be used in a direction parallel to the ground. F igures 9 and 10 show the dynamic characteristics of the follower and the contact force during the closing operation simulated by the VCB model, which was developed using AD AM S [10]. H ere, the constant velocity cam cannot be simulated because its radius changes rapidly.…”

“…In the case of the original cam, the acceleration has a vibration between 25 and 35 ms because the original cam is separated from the follower roller for a short time interval, as shown in F ig. 10. H owever, the cams designed by the polynomial and the cubic spline have no such vibration because the cam and the follower are in continuous contact.…”

Simulation analysis and design of a high speed mechanical contact base on electro-magnetic repulsion mechanism

“…The mechanism base on electro-magnetic repulsion force acting on a metal plate is called EM mechanism and it has the advantages of short delay time and high initial moving speed [2][3][4][5][6][7]. So it is especially suitable to drive the mechanical contact of a hybrid switch, and it has been widely used in DC hybrid current limiting circuit breaker [8], DC vacuum breaker [9] and new type of superconduction current limiter [10] et al…”

Dynamic analysis and structural design of links in an air circuit breaker to enhance fatigue life

“…Jobes et al [5] performed a dynamic analysis of a controllable circuit breaker mechanism for both low current and voltage using ADAMS. Ahn and co-workers [6,7] analysed the dynamics of a vacuum circuit breaker and an ACB using ADAMS.…”