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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
In 1912 the first 110 kV-overhead power line entered service followed by the first 220 kV-overhead power line in 1923. In the 1920s RWE AG built the first overhead line for this voltage and in 1926 built a Rhine crossing with the pylons of Voerde, two masts 138 meters high.
Three parallel 300 KV spans with east pylons at 143, 147 and 143 meters, west pylons 80, 90 and 92 meters. Spans are 1050, 924 and 879 meters respectively. Limfjorden Overhead powerline crossing 2
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.
As of 2022, more than 10,000 power plant and energy storage projects were awaiting permission to connect to the US grid — 95% were zero-carbon resources. New power lines can take 10 years to plan, permit, and build. [33] Traditional power lines use a steel core surrounded by aluminum strands (Aluminium-conductor steel-reinforced cable).
If local conditions are appropriate, an overhead line can be implemented by way of a valley bridge. For example, the Koersch valley bridge near Esslingen, Germany carries the 110 kV, three-phase line of the EnBW AG with 2 circuits. Because of the danger of short circuits from falling objects, undercrossings are typically avoided.
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