Kita-Iwaki powerline
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 36°34′33″N 139°13′25″E 37°25′33″N 138°35′51″E 37°22′53″N 140°48′16″E 36°37′22″N 138°48′6″E 36°42′46″N 139°49′57″E |
| 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.
Sites
| Substation/switch | Coordinates |
|---|---|
| Higashi-Yamanashi | 35°35′26″N 138°47′59″E |
| Higashi-Gunma | 36°34′33″N 139°13′25″E |
| Kashiwazaki-Kariwa | 37°25′33″N 138°35′51″E |
| Minami-Iwaki | 37°22′53″N 140°48′16″E |
| Nishi-Gunma | 36°37′22″N 138°48′6″E |
| Shin-Imaichi | 36°42′46″N 139°49′57″E |