History
The first stage of this project went in service in the year 2000 with a bipolar voltage of 250 kilovolts (kV) and rated to carry 1400 megawatts (MW). A second-stage upgrade to 500kV has been planned from the outset and the HV cable, DC switchgear and DC reactor are already rated for the higher voltage, but as of 2012 the upgrade has not been put into effect.
The project contained several "firsts" when it was originally built, including:
- The Kii Channel HVDC system was the first HVDC project to use Gas-Insulated Switchgear (GIS) on the HVDC side
- The thyristor valves, built by Hitachi, Toshiba and Mitsubishi, used 150mm diameter light triggered thyristors. At the time these were the largest thyristors ever made, and it was another 10 years thyristors of such large diameter were used again, in the Lingbao 2 and Xiangjiaba - Shanghai HVDC projects in China.
The first 50 kilometers of the transmission line run north from the Anan inverter station as an undersea cable. At Yura ( coordinates: 33°58′37″N 135°05′20″E / 33.97694°N 135.08889°E / 33.97694; 135.08889 (Yura Switching Station) ) there is a switching station, and from there the HVDC line runs for another 50 km as an overhead power line.
Read more about this topic: Kii Channel HVDC System
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