The Kita-Iwaki Powerline is the largest double-circuit powerline for three-phase electric power in the world. Built in 1999, it runs from Minami-Iwaki switch (Tamura, Fukushima) to Higashi-Yamanashi substation (Ōtsuki, Yamanashi) and has 2 circuits, which are operated at present with 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.
| Kita-Iwaki Powerline | |
|---|---|
| Location | |
| Country | Japan |
| Coordinates | 35°35′26″N 138°47′59″E / 35.59056°N 138.79972°E / 35.59056; 138.79972 36°34′33″N 139°13′25″E / 36.57583°N 139.22361°E / 36.57583; 139.22361 37°25′33″N 138°35′51″E / 37.42583°N 138.59750°E / 37.42583; 138.59750 37°22′53″N 140°48′16″E / 37.38139°N 140.80444°E / 37.38139; 140.80444 36°37′22″N 138°48′6″E / 36.62278°N 138.80167°E / 36.62278; 138.80167 36°42′46″N 139°49′57″E / 36.71278°N 139.83250°E / 36.71278; 139.83250 |
| From | Minami-Iwaki switch |
| To | Higashi-Yamanashi substation |
| Ownership information | |
| Operator | Tokyo Electric Power Corporation |
| Construction information | |
| Commissioned | 1999 |
| Technical information | |
| Total length | 240 km (150 mi) |
| AC voltage | 500 kV |
| No. of circuits | 2 |
There are two such lines: the first one is 190 kilometers long and starts at Kashiwazaki-Kariwa Nuclear Power Plant and runs over Nishi-Gunma switch to Higashi-Yamanashi substation. It was built in 1993. The second 240 kilometers long line, which was built in 1999 starts at Nishi-Gunma substation and runs over Higashi-Gunma substation to Minami-Iwaki switch, whereby it passes close to Shin-Imaichi switch, which is not connected to the line.
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