recalled more than a century since the power industry and the development of electric power system, deeply as economic development and technical progress brought about by the tremendous changes. On the 80-century 1990s, the power system is the initial stage. According to the records, in 1882 in New York, the United States built the world's first complete power system. This is a generator, cables and load consisting of DC power systems. However, as the DC transmission system limitations, it was switched to AC transmission technology, and in a turn of the century, established the AC transmission system to further the development and application of the basic orientation, hence the exchange of this century, the high voltage electricity transmission system and the large-scale development. F

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mianxiang21.ppt

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