title: Kita-Iwaki powerline
text: # 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.
  
  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 / ﻿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) |
  
  ## Sources
  
  * http://old.life-needs-power.de/2008/24-04-2008_Donnerstag/24042008_16-30_LNP_Luxa_1100%20kV-V2%203.pdf#page=9
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