Abstract
Overhead lines are, in essence, air-insulated cables suspended from insulated supports with a power transfer capacity approximately proportional to the square of the line voltage. Overhead lines are cheaper in initial capital cost and are generally more economic than cable feeders. In order to match both the mechanical and electrical characteristics of the overhead line conductor to the environmental conditions, climatic details must first be collected and analysed. For the transmission of equivalent power at 11 Kv, a cable feeder would cost some 5 times the cost of a transmission line, at 132 kV 8 times and at 400 kV 23 times. Such comparisons must, however, be treated in more depth since they must take into account rights of way, amenity, clearance problems, planning permissions associated with the unsightly nature of erecting bare conductors in rural and urban areas, and ongoing maintenance requirements.
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