Based on Type of Voltage
Alternating current transmission is the most widely used system for power transfer over long distances. It allows easy voltage transformation using transformers and is economical for generation, and distribution.
Direct current transmission is used for very long distances and submarine cables. It has lower transmission losses and no reactive power issues but requires costly converter stations. Based on Voltage Level
High voltage transmission is used for bulk power transfer from generating stations to substations. It reduces current flow and minimizes IR losses compared to low voltage transmission.
EHV transmission is adopted for long-distance bulk power transfer. It improves system efficiency and reduces conductor size and transmission cost per MW.
insulation, tower design, and advanced protection systems. Based on Length
In short lines, capacitance effect is negligible and only resistance and inductance are considered. These lines are generally used for lower voltage transmission.
Line parameters are uniformly distributed along the length. Based on Construction
Conductors are supported on poles or towers with insulators. They are economical and easy to maintain but affected by weather conditions. Underground Cables Cables are laid below the ground surface. They are safer and more reliable but costlier and difficult to repair.
These cables are laid under seas and rivers for interconnection of islands or countries. They are specially insulated to withstand water pressure and corrosion.
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