China upgrades its first UHV electricity transmission
Dec. 16, 2011 - XINHUA - pro.energycentral.com
China on Friday put into operation a project extending
its ultra high voltage (UHV) system to boost electricity
transmission capacity from the country's energy-rich
northern regions to the power-short central provinces.
After the extension, the 640-km Jindongnan-Nanyang-Jingmen
1,000-kilovolt alternating grids will double the
electricity transmission capacity and greatly relieve
the power shortage when demand peaks in winter and
summer under the Central China Grid, according to
the State Grid Corporation of China (SGCC), which
built the UHV lines. A total of 120 million kwh of
electricity -- equal to 60,000 tonnes of coal equivalent
-- can be transmitted daily through the grids, which
run between the city of Jingdongnan in northern Shanxi
province and Nanyang, Henan province and Jingmen,
Hubei province in central China.
As the first such grid designed and built by China,
the UHV grid became operational in January 2009 and
was upgraded this year.
In January this year, the SGCC said it planned to
invest 500 billion yuan (78.9 billion U.S. dollars)
to extend its UHV electricity transmission lines
to six by 2015.
UHV, defined as voltage of 1,000 kilovolts or higher
of alternating current and 800 kilovolts of direct
current, is designed to deliver large quantities
of power over long distances with less power losses
than traditional lines.