The document summarizes key aspects of transmission line design and components. It discusses the methodology for designing transmission lines, including gathering design data, selecting reliability levels, and calculating loads. It also covers the selection and design of various transmission line components such as conductors, insulators, towers, and grounding systems. Design considerations include voltage levels, safety clearances, mechanical requirements, and optimization of costs.
11. Height of Tower Structure Height of tower is determine by- h 1 = Minimum permissible ground clearance h 2 = Maximum sag h 3 = Vertical spacing between conductors h 4 = Vertical clearance between earthwire and top conductor
27. Continuous Current Rating. I 1 =current rating for temp rise ∆t 1 I 2 =current rating required to produced temp rise ∆t 2 R 1 = conductor resistance at conductor total temp T 1 (say 75°C) R 2 = conductor resistance at required conductor total temp T 2
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40. Mid span clearance: Direct distance b/n earth wire and top power conductor. As per IS 5613 following value of mid span clearance should be considered System voltage Mid span clearance(m) ≤ 66 KV 3.0 110 KV 4.5 132 KV 6.1 220 KV 8.5 400 KV 9.0
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