How many volts or more is extra high voltage

Extra-high voltage is the voltage level of ± 800 kilovolts and above direct current and 1000 kilovolts and above alternating current.

Extra-high voltage English abbreviation UHV, the voltage symbol is U (individual places with V expressed), the unit of voltage is volt, the unit symbol is also V, than the volt is larger than the kV (kilovolt), than the volt is smaller than the mV (millivolt), uV (microvolt), and between them is a thousand into the bit. In China, extra-high voltage refers to the voltage level of ± 800 kilovolts and above direct current and 1000 kilovolts and above alternating current.

Extra-high voltage can greatly enhance the transmission capacity of China's power grid, according to data provided by the State Grid Corporation, a circuit of extra-high voltage DC network can send 6 million kilowatts of electricity, equivalent to the existing 500-kilovolt DC network of 5 to 6 times, and the distance of the power delivery is also the latter's two to three times, so the efficiency is greatly improved .

Significance of the construction

In addition, according to calculations by the State Grid Corporation, conveying the same amount of power, if the transmission of electricity using extra-high-voltage lines can save 60 percent of land resources compared with the use of high-voltage 500-kilovolt lines. In terms of direct current, the Sichuan Xiangjiaba-Shanghai ±800 kV UHV direct current transmission demonstration project has been successfully put into operation, which is the world's highest voltage level, farthest transmission distance and largest capacity direct current transmission project planned for construction.

The Jinping-Sunan ±800kV UHV DC line project also passed completion inspection on May 13, 2012 successfully. The State Grid Corporation first announced on August 12, 2010, that by 2015, it would have completed the North China, East China, and Central China (the "Three Chinas") UHV grids, forming a "three vertical, three horizontal, and one ring network".