Pacific Intertie
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The Pacific Intertie is a high voltage direct current transmission line between Celilo, Oregon and Sylmar, California. Finished in 1970, the Pacific Intertie consists of a 1362 kilometer overhead transmission line. Originally only mercury arc rectifiers were used as static inverter valves. The valves were series connected in three six-pulse valve bridges for each pole. The blocking voltage of the valves was 133 kV with a maximum current of 1800 Amperes, for a transmission rate of 1440 megawatts with a symmetrical voltage of 400kV against earth.
- In 1972, after the Sylmar earthquake, the static inverter station in Sylmar had to be reconstructed after damage to the largest part.
- In 1982, the transmission rate of the mercury steam electric rectifiers was raised by various improvements to 1600 megawatts.
- In 1984, the transmission voltage was pushed to 500kV and the transmission rate was increased to 2000 megawatts by adding two six-pulse thyristor valve groups to each pole.
- In 1989, a further increase of the transmission rate took place by a parallel switched thyristor static inverter in Celilo and Sylmar.
More on the ABB website on Pacific HVDC Intertie:
- http://www.abb.com/GLOBAL/GAD/GAD02181.NSF/viewUNID/C1256D71001E0037C1256B8000371E41!OpenDocument
- http://www.abb.com/GLOBAL/GAD/GAD02181.NSF/viewUNID/C1256D71001E0037C1256B81002E886B!OpenDocument
- http://www.transmission.bpa.gov/cigresc14/Compendium/PACIFIC.htm
- http://www.transmission.bpa.gov/cigresc14/Compendium/Pacific%20Pictures.pdf