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CHAP PAGBS I Development in Overhead Power Transmission 121
Factors controlling the Design and Construction of Trans
mission Lines 2270
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aluminium conductor angle cable calculations catenary cent circuit clearance conductor material conductors and wires construction copper conductor corona crossarm curve dead-end decrease depending diameter distance of transmission ductor earth economical elastic limit electrical factor of safety flash-over galvanised given greater ground ground-line hard-drawn copper high-voltage higher voltage horizontal inches increase kYA capacity length of span less lightning lightning arresters line conductors line insulators line supports line voltage long spans material maximum mechanical metal method mile minimum operating overhead earth-wire overhead lines parabola pin-type insulators power factor power-transmission lines practice reactance resistance sleet spacing span-length steel-cored strain insulators stranded string structures suspension insulators synchronous condensers Table temperature tension three-phase transformers transmission distance transmission line transmission system ultimate strength usually vertical voltage lines volts wayleaves weight wind pressure wood poles