Transformer substations and distribution stations are needed to connect electrical networks of different voltage levels and to transport power with low loss. An important property of a transformer is that it is high efficiency (approx. 99.5%) and there is thus hardly any power loss during distribution.
Transformer substations are generally used for various voltage levels and for multiple purposes. The most important goal is the distribution of high power, usually via high voltage, using a power transformer, or the distribution of lower power via medium voltage, using distribution transformers. In addition to the previously-mentioned applications, the traction transformer is another example in which the transformer is used for traction operations for the power supply to tram and train overhead lines. The winding configurations of the transformers are designed in such a way that after rectification, an almost smooth direct voltage is created.
The measurement and protection of your network takes place using measurement transformers. When you measure the current and voltage of your network, you can use this to protect against short-circuits and also measure energy consumption. In a network configuration in which the star point is not earthed, an earthing transformer (zigzag) can offer results. This also includes using your own operating transformer, eg. 250 kVA in combination with a zigzag winding configuration, can withstand a ground fault protection of, for example, 1000A – 5 sec.