Note for Power System-1 - PS-1 By Adisu Teshale
- Power System-1 - PS-1
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MECHANICAL DESIGN OF OVERHEAD TRANSMISSION LINES Prepared By:- Adisu Teshale
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Outlines ❑ Introduction ❑ Classifications of Line Support (Towers) ❑ Sag Calculations
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5.1 Introduction Electric power can be transmitted or distributed either by means of underground cables or by overhead lines. The underground cables are rarely used for power transmission due to two main reasons. Firstly, power is generally transmitted over long distances to load centers. Obviously, the installation costs will be very high. Secondly, electric power has to be transmitted at high voltages for economic reasons. It is very difficult to provide proper insulation to the cables to withstand such higher voltages. 2/13/2019 3
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Cont… An overhead line is subjected to uncertain weather conditions and other external interferences. This calls for the use of proper mechanical factors of safety in order to ensure the continuity of operation in the line. In general, the strength of the line should be such so as to provide against the worst probable weather conditions. 2/13/2019 4
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