Tokyo Electric Power Company, Inc. began operation of the Nishi-Gunma UHV trunk line, the first 1000 kV-designed power line in Japan, in April, 1992. This line is expected to be the key line in a major trunk-line system that is being developed. It traverses high-altitude mountainous areas subject to severe environmental and meteorological conditions for a long distance. A system using Composite Fiber-optic Overhead Ground Wire (OPGW) is constructed to obtain precise information on this line for maintenance pu…
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