In 30 years, it has a lot of impact, but it is precious to China's major technical equipment. It is during these 30 years that China has achieved remarkable achievements in major technological equipment. Among these, power transmission and transformation equipment is undoubtedly the most prominent highlight. Since the early 1980s, through the introduction of technology, digestion and absorption and re-innovation, China's power transmission and transformation equipment manufacturing industry has gradually shortened the gap with the international advanced level. After 1998, relying on the sending project of the Three Gorges Hydropower Station, the 750 kV AC transmission and transformation demonstration project in the northwest, and the demonstration project of UHV AC and DC power transmission and transformation, the power transmission and transformation equipment manufacturing industry in our country has developed by leaps and bounds and has fully mastered the 500 kV AC, DC and 750 kV AC transmission and transformation of key equipment design and manufacturing technology. After entering the 21st century, China has launched a ± 800 kV UHVDC and 1000 kV UHV AC power transmission and transformation complete sets of equipment research and construction, and I mainly foreign cooperation in the production of the world's first million volts The complete sets of equipment required for the exchange of pilot demonstration routes (southeastern-Nanyang-Jingmen) occupy the commanding height of the world's power transmission and transformation technologies and equipment manufacturing and testing. HVDC crosses the step DC transmission and electrical processes in our late start. The equipment and technology of two ± 500 kV HVDC transmission projects built in 1980s and 1990s all depend on imports. Our country still does not have the ability to design and manufacture ± 500 kV DC power transmission and transformation equipment. During the Ninth Five-year Plan period, in order to grasp the manufacturing capability of related technical equipment as soon as possible, according to the transmission demand of the Three Gorges Project, the State relies on the "Three Gorges-Changzhou ± 500 kV DC Transmission Project" Subcontracting manufacturing and research innovation "approach, that is required in the international bidding foreign transfer of converter transformers , smoothing reactors, converter valves and thyristor technology, and allow domestic manufacturers to subcontract the manufacturing of ± 500 kV DC Complete sets of transmission equipment technology for digestion and absorption. Subsequently, through the construction of the ± 500kV DC transmission project in the Three Gorges-Guangdong, Guizhou-Guangdong, the Three Gorges-Shanghai, the domestic manufacturing enterprises further expanded their share of subcontracting manufacturing and introduced the key technologies of HVDC control and protection system , In the DC transmission equipment manufacturing technology and manufacturing capacity achieved across. During this period, the power transmission and transformation equipment manufacturing enterprises of our country successively developed converter transformers, smoothing wave reactors and high-power thyristor components through joint design and independent manufacturing, which gradually increased the localization rate of equipment from 30% at the beginning and In the high-power thyristors, converter valve manufacturing and converter station complete sets of equipment and design technology has made a major breakthrough. After the above project of tempering the power transmission and transformation equipment manufacturing enterprises in our country and implementing the "Lingbao DC back-to-back" project put into operation in 2005, China has achieved 100% localization of complete sets of equipment and fully equipped with independent design and manufacture The ability of ± 500 kV DC power transmission engineering and equipment has completely changed the history of HVDC equipment relying on imports. EHV transmission Yong record With the development of the cascade hydropower stations in the upper reaches of the Yellow River in Northwest China, it has become an urgent need to construct a 750 kV power transmission and transformation project. The Gongboxia Hydropower Station, which started construction in 2001, is one of the large-scale cascades at the upper reaches of the Yellow River. Its power is delivered from Guanting to Lanzhou East. It is one of the important channels for "power transmission from west to east" of the Northwest Power Grid with a length of 140.7 km. In 2003, it was identified as the first demonstration project of 750 kV transmission and transformation in our country. At the same time, "750 kV AC power transmission and transformation complete sets of equipment" has also been included in the "Tenth Five-Year" national major technical equipment development projects. The project voltage level is high, but also in the high altitude of 3000 meters, technical difficulty. 37 research, design, manufacture, construction and commissioning units of Xidian Group, TBEA and Tianwei Group, respectively, through numerical analysis, physical simulation, physical test and on-site test. Through repeated research experiments and breakthroughs in research, Grasped a series of core technologies of design, manufacture, construction, commissioning and automatic control of power grid safety of a full set of electrical equipment such as high-altitude and heavily polluted main transformers involved in the 750-kilovolt power transmission and transformation project. The 750,000- Transformers, reactors, circuit breakers and so on. September 2005, the project completed and put into operation, the smooth realization of the "one-time manufacturing success, one-time successful installation, one-time operation of the success of" the expected goal, won 25 national patents, but also the formation of 20 related standards were Rated as China Power Quality Project. Project achievements won the 2007 National Science and Technology Progress Award. The demonstration project research and implementation, to fill the gaps in the world, creating the world's highest altitude, the highest operating voltage transmission and distribution technology record. At present, this transmission and transformation demonstration project has been put into operation safely for more than four years. The achievements in its key technology research and core equipment development have been widely applied in the subsequent construction of 750 kV project. UHV AC transmission in the world record first UHV transmission technology in China mainly refers to ± 800 kV DC transmission and 1000 kV AC transmission technology. The construction of UHV power grids can reduce the number of corridors and save a large amount of land resources. At the same time, it can also reduce the pressure on railway transportation and the environmental protection in the central and eastern regions. It also increases the capital investment in the western region and promotes the coordinated development of regional economy. According to the survey conducted by China Machinery Industry Federation, together with State Grid Corporation and China Southern Power Grid Corporation, the development of UHV will make China's EHV power transmission and transformation equipment manufacturing technology more mature and realize the optimization and upgrade of the manufacturing technology of AC and DC power transmission and transformation equipment, Of the international competitiveness, and can promote and enhance the independent innovation capability of equipment manufacturing industry and the overall technical level. In 2005, the state explicitly made the UHV power transmission and transformation project a pilot demonstration project for technological upgrading and independent innovation in the equipment manufacturing industry. It requires that in addition to some of the key technologies that can be provided by the foreign parties, other technologies are basically based on the domestic market to achieve independent R & D and manufacturing. In 2006, China approved the construction of 1000 kV Jindongnan-Nanyang-Jingmen UHV AC pilot demonstration project. The project includes three stations and two lines, starting from Enclosure WYBOX WE Series BOX,WYBOX WE Series Enclosure,WYBOX WE Series Enclosure BOX wybox inc. , https://www.wybox.com