The Kita-Iwaki Powerline is the largest double-circuit powerline for three-phase electric power in the world. Built in 1999, it runs from the Minami-Iwaki switch (Tamura, Fukushima) to the Higashi-Yamanashi substation (Ã Âtsuki, Yamanashi) and has 2 circuits, which are presently operated at 500 kV, but can be switched over to 1100 kV if necessary equipment is installed. The conductors of the lines consist of 8*31.5 mm ACSR ropes providing for a total current capacity of 4000 amperes. The line is supported by lattice towers with a typical height of 108 meters. These have three crossbars of spanning 31, 32 and 33 meters.
There are two such lines: the first one is 190 kilometers long and starts at the Kashiwazaki-Kariwa Nuclear Power Plant and runs over the Nishi-Gunma switch to the Higashi-Yamanashi substation. It was built in 1993. The second 240 kilometers long line, which was built in 1999 starts at the Nishi-Gunma substation and runs over the Higashi-Gunma substation to the Minami-Iwaki switch, whereby it passes close to the Shin-Imaichi switch, which is not connected to the line.
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