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A detailed study is presented of the economics of conventional underground transmission lines utilizing oil-paper insulated pipe-type cables. Three cryogenic ac transmission lines, cooled, respectively, by nitrogen, hydrogen, and helium, are compared with conventional cables and overhead lines. The nitrogen-cooled system, so far the most simple form of cryogenic cable proposed, is found to be the most attractive from the point of view of low-cost underground transmission.
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Peter Graneau (1970) studied this question.
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