Transformer in the local grid © Siemens Stiftung 2017 CC BY-SA 4.0 international

Transformer in the local grid

Image

Photo:
The photo shows a transformer as it is used in the local grid for stepping down from the medium-voltage system (for example, from 30 kV) to a low voltage of 230 volts.

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Image (2.9 MByte)
2018-07-13
The longer the power transmission path is for alternating current, the higher the voltage must be in order to minimize the transmission losses. Therefore, with a central electric power supply, the electric power at the power plants is stepped up from approximately 30 kV to, for example, 380 kV for long-distance transmission. It is then stepped down for regional distribution, for example, to 60 kV or 30 kV, and for local distribution to households to 230 V.
Illustration
Geography; Physics; Technology
Grade 7 to 9; Grade 10 to 13
Middle/high school; Vocational training
Energy supply; Physics; Transformer
Media portal of the Siemens Stiftung
Dr. Michael Huber
© Siemens Stiftung 2017
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