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The HVDC Vancouver Island is the name for HVDC interconnection between the Vancouver Island Terminal (VIT) near North Cowichan, British Columbia on Vancouver Island at 48°49′39″N 123°42′55″W / 48.8275°N 123.71528°W / 48.8275; -123.71528 and the Arnott Substation (ART) near Delta, British Columbia at 49°5′31″N 123°2′31″W / 49.09194°N 123.04194°W / 49.09194; -123.04194 on the Canadian mainland, which went into operation in 1968 and was extended in 1977. HVDC Vancouver Island consists of a 42-kilometer overhead line and a 33-kilometer-long submarine cable. The power line on the mainland split itself (why?) at 49°3′38″N 123°4′30″W / 49.06056°N 123.075°W / 49.06056; -123.075 into two branches, one running at a terminal at 49°3′6″N 123°7′22″W / 49.05167°N 123.12278°W / 49.05167; -123.12278, the other at a terminal at 49°1′40″N 123°6′1″W / 49.02778°N 123.10028°W / 49.02778; -123.10028. To the line, which reaches Vancouver Island at 48°51′2″N 123°25′31″W / 48.85056°N 123.42528°W / 48.85056; -123.42528, also a long-distance span on Vancouver Island over Cowichan Valley with a length of 1900 metres between 48°49′40″N 123°35′21″W / 48.82778°N 123.58917°W / 48.82778; -123.58917 and 48°49′54″N 123°33′50″W / 48.83167°N 123.56389°W / 48.83167; -123.56389 belongs. In 1968 the first pole of the HVDC Vancouver Island went into service. Its static inverters use mercury vapor electric rectifiers. The maximum transmission rate of this pole is 312 megawatts. Its transmission voltage is 260 kV. In 1977 the HVDC Vancouver Island was supplemented by installing a second pole. This pole uses thyristor valves in its static inverters and can transfer at an operating voltage of 280 kV with a maximum power of 370 megawatts. Currently a submarine cable for three-phase alternating current is being constructed between the Canadian mainland and Vancouver Island, that will replace the HVDC line.
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