500-kV XLPE-insulated cable with an insulation thickness of 27 nim and its joint have been developed for long distance transmission lines. First, in the basic research made irom 1989 to 1992, elicited were the perfortnance-detertnining factors of XLPE cables and joints. Their respective insulation designs were inade in terms of these factors. On the basis of these designs, full-sized cables and joints were manufactured in the course of the development research performed from 1Y92 to 1993. The next step was to…
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