Investigation on the Dynamic Characteristics of a Magnetic Release in Molded Case Circuit Breaker(Session 5 : Contactactors & Circuit Breakers)

概要

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A method is proposed to investigate the dynamic characteristics of a magnet release in molded case circuit breaker. With the static field assumption, two grids of the magnetic torque and flux linkage are calculated with the variation of the current and air gap, firstly. Considering the influence of tripping force, coupled with circuit equation and mechanism motion equation, the dynamic characteristics may be obtained with Runge-Kutta 4 method. Experiments have been done to verify the method. In addition, the influence of the reaction spring on the operation characteristic is analyzed. It demonstrates that the difference of the protection characteristic curve between experiment and simulation is below 10%, and it is easier to adjust the initial length of the reaction spring to meet the requirement of different rated current and operation current, relative to adjust the stiffness of the reaction spring.
社団法人電子情報通信学会の論文
2004-10-15