| Summary: | 碩士 === 吳鳳技術學院 === 光機電暨材料研究所 === 95 === Due to the progressive development in this hi-tech era, the increasing demands of electricity are relatively stronger than ever before. In order to provide electricity with better stability and reliability from the influence of external environmental causes such as typhoons, earthquakes, and heavy rainfalls, the Taiwan Power Company, Ltd. has initiated the action to move the electrical power transmission lines underground from the year of 1996. The power transmission lines hung on huge steel towers are replaced by the high voltage power lines, which are linked together through cable joints with various power distribution equipments (such as transformers, switch boxes, power switches, and so on), to evolve into a underground power distribution grid. After years of efforts, the underground transmission lines have gradually developed into an aggregated electric power network. In the recent years, the possible health effects of electromagnetic fields (EMFs) have raised a lot of disputations. Furthermore, the public usually has more concerns on EMFs rather than the electromagnetic waves. Accordingly, this research was motivated to investigate the EMF effects of electric power cables residing among our living environment, and to appreciate the complicated EMF phenomena as well as the degree of adverse influence.
Based upon the finite element method and theory of electromagnetic wave, in conjunction with the design principles of power transmission cables and the finite element analysis software COMSOL Multiphysics (FEMLAB), this study constructs a set of basic electromagnetic analysis modules. The aim of these basic modules is to model various electromagnetic field distributions of power transmission cables in the electrostatic field, the magnetostatic field, and the time-varying electromagnetic field. Meanwhile, different transmission configurations (e.g., R-phase, S-phase, and T-phase) and various frequencies can be applied to find the interaction between electrical and magnetic fields for the power cable in the space of pipeline, as well as the level of induced electromagnetic energy, in order to evaluate the degree of effectiveness in the surrounding environment and possible protection strategies. By the variable parameters and multiphysics coupling functionalities, the time to conduct real physical test and the cost to make samples could be greatly reduced. The simulation results not only can provide a different viewpoint toward EMF research but also broaden the scopes on power cable design.
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