The world's first ± 800 kV HVDC Transmission Project, the world's first 1000 kV UHV AC transmission project, UHV projects in India ... South Network, scientific research institutes, ± 800 kV UHV DC composite insulator "patent has been widely used. global field of UHV transmission enjoy the inventions of the China Southern Power Grid, three years, new sales over 240 million yuan. The patent is only one of many patents in the ± 800 kV UHV DC insulation characteristics of and application for the "high altitude.

Recently, commissioned by the China Southern Power Grid Company, the Chinese Society of Electrical Engineering was held in Shenzhen organization research and application of the insulating properties of the high altitude ± 800 kV HVDC project technology appraisal. The appraisal committee of experts agreed that: the project's innovative, succeeded in solving key technical problems of the external insulation design of UHV DC power transmission project in high-altitude research in general reached the international advanced level, some results of leading international.

The development of UHV DC transmission is an important measure of China's electric power development in the history of a reasonable choice of lines and converter stations insulation is one of the key issues facing the construction of UHV DC Transmission Project.

Insulator artificial contamination test results and the long air gap discharge characteristics of the test results can provide important reference for the engineering design. According to the Southern network pressure, director of scientific research institutes, Li Ruihai, due to the lack of actual high-altitude full-size test conditions, at home and abroad in the actual high-altitude conditions, the special high-pressure filthy insulation discharge characteristics and long air gap discharge characteristics is relatively small, The experimental data obtained are not many existing data in the artificial climate chamber, resulting in UHV DC transmission project construction to the lack of direct experimental data available as a design reference.

In order to grasp the core technology of UHV DC transmission to solve the the UHVDC outside the high altitude insulation design and operation of the key technical issues, and improve the level of autonomy of the DC transmission technology, the China Southern Power Grid Institute of Science and Technology combined with Tsinghua University set up a project group, more than 10 researchers through a five-year research cooperation, UHV technology in high-altitude conditions (Kunming) National Engineering Laboratory to carry out the insulation test a large number of high-altitude research, some results have been successfully used in engineering design and product production, and achieved good social and economic benefits.

It is understood that the "high altitude, ± 800 kV UHV DC insulation characteristics of research and application projects research and innovations include: the ± 800 kV full-size suspension and post insulators DC Pollution Flashover, different materials different sheds structure of the full-size insulator 50% withstand voltage and contamination condition of the characteristics of law; air gap discharge characteristics of a typical electrode and ± 800 kV DC line tower head, access to the characteristics of the 50% discharge voltage and gap distance law, in particular, switching impulse discharge voltage and gap distance characteristics of the law; sheds structure of composite insulators DC Pollution Flashover optimized insulator umbrella structure for the DC line of high altitude; based on the actual altitude of 2100 m The true test, the insulator 50% of the pollution withstand voltage and air gap discharge voltage (DC and lightning impulse and switching impulse voltage) the altitude correction factor; of ± 800 kV DC transmission project Yunguang insulation configuration ; study the impact factor of Artificial pollution tests of composite insulators, the control method of a composite insulator artificial contamination test conditions.

So far, a total of patent 23 software copyrights, 56 published papers (SCI 4 EI Indexed 36), monographs 1.

Not long ago, held in the Guangzhou Municipal Government, Guangzhou City, the State Intellectual Property Model City "Award-cum-Patent Awards ceremony in Guangzhou City, the" high altitude ± 800 kilovolt high voltage direct current insulation properties and application projects under ± 800kV UHV DC composite insulator invention patents Supporting Award of the 12th China Patent Award of Excellence. Prior to this, that the patent had in October 2010 for the 12th China Patent Award of Excellence in August 2011, the Guangdong Provincial Government reward of 500,000 yuan, the Supporting Award was awarded the China patent award is the third award of the patent fully explain the significance of the patent and all levels of government its affirmation.