History Protection - Relaying in Japan

No article on the history of protection relaying in Japan would be complete without a brief introduction to some of the unique attributes of the Japanese power system. The peak demand in Japan is around 180GW and as illustrated in Figure 4, Japan comprises four main islands Hokkaido, Honshu, Shikoku and Kyushu along with Okinawa and many other smaller islands. The main islands are connected via AC/DC converters with the exception of the connection between Kyushu and Honshu,  which is connected via a 500kV AC transmission line rated at 5570MW. The undersea DC links from Honshu to Hokkaido and Shikoku to Honshu are rated at 600MW and 1400MW respectively. Shikoku is also connected to Honshu via a 500kV 2400MW overhead transmission line. More

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