Distribution Networks
Electric power from a generating station is transmitted to grid substations via overhead pylons at high voltage. In the United Kingdom, this will be 400 kV, 275 kV or 132 kV. Different voltages are used in other countries. This power is transmitted using a three-phase distribution system.
At the grid substation, a step-down transformer is connected across two of the three phases of the high-voltage supply. The transformer lowers the voltage to 25 kV which is supplied to a railway feeder station located beside the tracks. SVCs are used for load balancing and voltage control.
In some cases dedicated single-phase AC power lines were built to substations with single phase AC transformers. Such lines were built to supply the French TGV.
Read more about this topic: 25 K V AC Railway Electrification
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