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 the Minami-Iwaki switch (Tamura, Fukushima) to the Higashi-Yamanashi substation (Ōtsuki, 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.

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 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.

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

Sources

• http://old.life-needs-power.de/2008/24-04-2008_Donnerstag/24042008_16-30_LNP_Luxa_1100%20kV-V2%203.pdf#page=9^{[dead link]}