Kita-Iwaki powerline

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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
Construction information
Commissioned 1999
Technical information
Total length 240 km (150 mi)
AC Voltage 500 kV
No. of circuits 2

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.

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[edit]

Substation/switch Coordinates
Higashi-Yamanashi 35°35′26″N 138°47′59″E / 35.59056°N 138.79972°E / 35.59056; 138.79972 (Higashi-Yamanashi substation)
Higashi-Gunma 36°34′33″N 139°13′25″E / 36.57583°N 139.22361°E / 36.57583; 139.22361 (Higashi-Gunma substation)
Kashiwazaki-Kariwa 37°25′33″N 138°35′51″E / 37.42583°N 138.59750°E / 37.42583; 138.59750 (Kashiwazaki-Kariwa)
Minami-Iwaki 37°22′53″N 140°48′16″E / 37.38139°N 140.80444°E / 37.38139; 140.80444 (Minami-Iwaki switch)
Nishi-Gunma 36°37′22″N 138°48′6″E / 36.62278°N 138.80167°E / 36.62278; 138.80167 (Nishi-Gunma switch)
Shin-Imaichi 36°42′46″N 139°49′57″E / 36.71278°N 139.83250°E / 36.71278; 139.83250 (Shin-Imaichi switch)

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