Power Plant Switching Station (Switchyard) – Electrical Some substation, such as power plant switchyard are simply switching stations where different connections can be made between various transmission lines. Typical Components of a Power Plant Substation. BUSBAR. BUSBAR (or bus, for short) – is a term we use for a main bar or conductor carrying an electric current to which many connection may be Switchyard design overview - SlideShare Oct 18, 2014The switchyard is a junction connecting the Transmission & Distribution system to the power plant. Tie line is a connection point between two or more power plants or simply a power grid while a transmission line is a high voltage line which transfers electrical power from the power generating plants to substations.