On December 15, the Science and Technology Department of Hubei Province organized experts from the fields of metrology and electricity in Wuhan to conduct technical appraisal on the project of "Research on 1000kV DC UHV State Metering Standard Device" undertaken by the State High Voltage Metrology Station. An appraisal committee composed of Fan Mingwu, an academician of the Chinese Academy of Engineering, unanimously held that the project established a national standard system for measurement of UHVDC of 1000kV DC based on completely independent intellectual property rights and implemented a comprehensive measurement system of measurement standards, traceability technology and value delivery technology Innovation, technical indicators have reached the international advanced level.
China is the country with the largest number of DC transmission projects and the highest transmission voltage level in the world. Currently, a number of 800-kilovolt UHVDC transmission lines have been put into operation, and direct-current transmission lines of higher voltage levels are under preparation. In order to support the development strategy of "Global Energy Internet" proposed by State Grid Corporation of China (SGCC) as the backbone network of UHV power grids and compete for the international discourse power in the field of UHVDC, the National High Voltage Metrology Station, after many years of scientific research, is the first in a 1kV ~ 1000kV voltage The direct measurement method is used to realize the self-calibration of the standard value of DC voltage ratio. The detection method of divider ratio voltage coefficient based on detachable auxiliary voltage divider, the iterative algorithm of temperature distribution and heat dissipation of voltage divider in thermal equilibrium, Component voltage coefficient and the temperature compensation coefficient of mutual compensation methods and many other innovative methods, mastered the "a voltage divider 2/1 partial pressure ratio self-calibration method" and many other core inventions technology, in the proportion of DC UHV standards research A major breakthrough has been made and a standard system for UHV measurement with DC power has been set up which has completely independent intellectual property rights. This has raised the level of uncertainty of 1VDC to 500kV DC voltage levels in China by two levels and filled the 500kV ~ 1000kV DC voltage The ratio of the blank value, 500kV ~ 1000kV measurement uncertainty is better than 5 × 10-5. This achievement is a major technological breakthrough in the field of UHVDC measurement, which has enabled China to reach the international advanced level in this field. It provides the development of UHVDC power transmission in China in terms of accurate measurement of DC high voltage, trade of electric energy, energy saving and emission reduction Technical Support.
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