Ultra-high pressure referred to as UHV；; ; The voltage symbol is u (expressed by v in some places); The unit of voltage is volt, and the unit symbol is also V; There are kV (kilovolts) greater than volts, mV (millivolts) and uV (microvolts) less than volts, and there are kilovolts between them. In China, UHV refers to DC and 1000 kV and above with voltage level of 800 kV.
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UHV can greatly improve the transmission capacity of China power grid. According to the data provided by State Grid Corporation of China, a UHV DC network can send out 6 million kilowatts of electricity, which is 5 to 6 times that of the existing 500 kV DC network, and the transmission distance is 2 to 3 times that of the latter, so the efficiency is greatly improved.
In addition, according to the calculation of State Grid Corporation, if the same power is transmitted, compared with 500 kV high-voltage lines, land resources can be saved by 60%.