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심재학,정운관,윤인식,김성영 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.2
In the analysis of isolated phase bus bar(IPB), the magnetic field distribution generated by large current must be understood accurately. Especially, while the current of bus conductor is flowing, almost the same amount of current as the current of bus conductor is induced in the enclosures under the influence of time varying magnetic field, and the large electric loss and the deterioration of insulating capability might occur due to Joule heating effect. Therefore the optimal design of IPB satisfying the condition of minimizing the electric loss, the magnetic field distribution and eddy current characteristics around the enclosures must be analysed accurately. In this paper, the magnetic field distribution and the eddy current characteristics of three phase isolated phase bus have been studied along the phase angle by comparing the effect of eddy current on the magnetic field distribution with the case that eddy current is not considered, and also the effect of material thickness and radius of enclosure on the eddy current distribution is discussed. In the analysis of time varying magnetic field, instead of finite difference method(FDM) which is generally used, finite element method(FEM) with phasor concept is investigated under the assumption that the bus current is purely sinusoidal. The characteristics