The main system of the electricity network is the transmission line system, which is characterised by 400-220 kV, in some places 120 kV high voltage transmission lines and a 750 kV transmission line as well as by transformer substations.
Electricity is sold abroad via the transmission line system. The transmission line system supplies and transfers the electrical energy generated in the power plants of the electricity system to the distribution network, through which it is forwarded to the consumers.
The distribution network supplying electricity between the transmission line system and the consumers is specifically comprised of 0.4 kV low voltage, 10 and 20 kV medium voltage and 120 kV high voltage transmission lines and underground cables as well as of transformer substations.
In transformer substations, electrical energy is transformed between different voltage levels.
With the exception of some big towns, the substations of the transmission line system are located outside residential areas, extending on several hectares of greenfield lands. The majority of the distribution network substations are located close to the consumers, within or near the limits of towns and cities.
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