Transmission

The electricity is transported to load locations from a power station to a transmission subsystem. There are two kinds of transmission lines, underground or overhead. Considering the economical issue, the overhead transmission lines are common. A overhead transmission line consists of conductors, insulators, and mechanical supports. And a underground line which is mainly used in urban areas consists of oil-filled cables placed in elaborate duct systems. Transformers are important static devices which transfer electrical energy from one circuit with another in the transmission subsystem. Transformers are used to step up the voltage on the transmission line to reduce the power loss which is dissipated on the way.

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ВАРІАНТ I