| Summary: | 碩士 === 國立中山大學 === 電機工程學系研究所 === 94 === This thesis presents a computational analysis of the magnetic field of low-frequency power transmission lines, and the approaches to its suppression. First, according to the structure of Taiwan''s three-phase A.C. transmission network, this research calculated the distribution of conducting wires'' magnetic field under specific configuration by applying the theories of Near-field effect, Biot Savart''s law, and double complex number. Second, this research explored the features of various approaches to magnetic field suppression with magnetic-field vector analyses and Matlab simulations. Finally, two magnetic-field cancellation methods, the “circuit space arrangement” and “time phase permutations” were adopted to investigate their magnetic effects under various structures and combinations of transmission lines. This study reveals that the magnetic field can be effectively suppressed by using appropriate configuration of transmission lines in space and phase. By applying the result to the design and construction of transmission lines, we can meet not only the requirements of magnetic field reduction, but also the needs of the least cost.
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