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High- and medium-voltage power lines in Łomża, Poland Extra high-voltage overhead line 750 kV. Overhead power transmission lines are classified in the electrical power industry by the range of voltages: Low voltage (LV) – less than 1000 Volts, used for connection between a residential or small commercial customer and the utility.
These lines are mounted on the pylons of the overhead wire over the lines. The voltages used for traction current lines are 110 kV in Germany and Austria and 66 kV or 132 kV in Switzerland. Traction current lines are operated symmetrically against earth. In the case of 110 kV lines, for example, each conductor has a voltage of 55 kV against earth.
The 110 kV network is nearing capacity due to increasing demand in the region. It is vulnerable to loss of supply or low voltage when any 110 kV circuit or 220/110 kV inter-connecting transformer is out for maintenance. The smaller lines can also constrain the import of power into the region when Manapouri generation is low
The following is a list of spans, either used for overhead line crossings of rivers, sea straits or valleys, as antenna or for aerial tramways. This list is incomplete ; you can help by adding missing items .
One drawback of AIS is the visual impact of a larger substation with overhead power lines entering and exiting, which may be unacceptable in scenic or urban areas. [38] AIS requires additional bracing in a seismically active area, and emits more electromagnetic fields and noise than alternative technologies.
English: Overground high voltage power lines in Germany as in 2022. Voltages more than 50 kV. bright grey: disused/zero voltage purple: 50 - 100 kV dark blue: 110 kV (pale blue: underground cable, blue: construction) green: 220 kV (pale green: underground cable) red: 380 kV (pale red: underground cable, dark orange:construction) dark red: 400 kV