有限要素法における磁界解析の応用研究(配線用遮断器におけるアーク磁気駆動力の解析)

概要

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The design of arc rupturing parts of low-voltage air circuit breakers depends upon the strength and distribution of the magnetic blowout field by which the arc is forced. The magnetic blowout causes the arc to move into a set of slotted iron grids, where the arc is extinguished rapidly. The current in the conductors and the arc make up a magnetic field through the grids around the arc. Thus, the first step in the calculation of the motion of the arc is the prediction of the magnetic blowout force. In many cases, however, it was not easy to calculate the forces owing to the complicated three dimensional structure of arc chutes and contact systems. In this paper, a developed method which can calculate the distribution of magnetic blowout forces along arc which lie at arc rupturing Parts 　of a circuit breakers is described. The forces are calculated in the same way that a conductor is moved in the magnetic field. The flux density in the arc is obtained by 2-D or 3-D finite element method taking into account magnetic saturation of iron plates. And then, the differences between 2-D and 3-D finite element method are discussed by calculated results of the model.
津山工業高等専門学校の論文
1992-10-30