The basic elements of overhead power line technology have been known for many years. However, this technology has continuously developed, for example, adjusting the design of the lines to new transmission needs and to available rights-of-way, and to accommodate environmental concerns or resources. Since many existing overhead line installations are approaching the end of their economic and technical lifetime, strategies for maintenance to extending their operational life are needed. Also, because of the introduction of new standards and deregulation, the basis of design
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