A transmission lin e is the material meduim or structure that forms all or part of a path from one place to another for directing the transmission of energy, such as electromagnetic wave or acoustic waves. Example of transmission lines is wires. There are different types of over head conductors. The choice depends on the application. The following shows some of over head conductors types: — Bare soft and hard drawn stranded — Soft drawn type is used for grounding electrical systems, while hard drawn type is used in over head distribution networks. All aluminium conductors Used for aerial distribute lines have relatively short spans, aerial feeders and bus bars of substations. — All aluminium alloy conductors Used for transmission and distribution networks, having relatively long spans. Aluminium conductor steel reinforced Used for power transmission over long distances Conductors Comparison Between Different Types of Aluminum (for 185 mm 2 Conductor as an example) AAC AAAC ACSR Tensile (KN) 43.66 71.55 85.12 Weight (Kg/Km) 671.1 670.3 980.1
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