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In China's "West to East" transmission project, 1100 kV DC transmission with its outstanding power transmission distance, transmission capacity, low transmission loss prominent advantages, to support longer distance, more large-scale transmission of the core technology. The 1100 kV DC wall bushing is the only electrical continuity equipment that connects the internal and external high-voltage and large-capacity electrical equipment in the valve hall of the converter station. The single unit carries the system-wide voltage and current with a capacity of 6 million kilowatts (equivalent to Beijing's total electricity load of 1/3), called the "throat" of the HVDC transmission system, which has the characteristics of high complexity and high reliability requirements, is the technical bottleneck that restricts the development of China's 1100 kV HVDC transmission project.
"Eleventh Five-Year" 863 Plan Advanced energy technology "1000kV DC SF6 gas-insulated wall bushing core technology research and device development" project made an important progress in 1100 kV DC wall bushing, breaking the casing material, Design, technology and testing a series of key technologies, is a national initiative, the international leader. The project has four subjects recently passed the technical acceptance. This project is undertaken by China Electric Power Research Institute and jointly completed with Xi'an Jiaotong University, Tsinghua University, Pinggao Group Co., Ltd. and Xi'an Xidian High-voltage Casing Co., Ltd.
The project successfully developed the world's first "epoxy core SF6 gas composite insulation" and "pure SF6 gas insulation" insulation structure 1100kV / 5523A DC wall bushing, developed with independent intellectual property rights of casing insulation material formulation system , Overcome the non-bubble impregnation technology of super-large epoxy core and thermal stress suppression technology in curing process, and established a comprehensive test platform for electric, thermal and mechanical properties of 1,100 kV UHVDC bushing and test technology system in the world The first to complete the two structures of 1100 kV DC wall bushing a full set of tests. The DC wall bushing developed by the project will be put into operation in the Changji-Guquan HVDC Transmission Project, the world's first 1100 kV DC transmission project.
The implementation of this project has broken through the core technology of 1100 kV DC wall bushing and successfully developed 1100 kV DC wall bushing. The related technologies have been applied to the research and development of DC bushing at voltage level of 800 kV and below, It is of great significance for our country to lead the core technology in the history of high-end electric equipment R & D. It is of great significance to realize the full localization of UHV DC equipment, reduce the construction cost, guide the upgrade of China's electric equipment manufacturing industry and enhance the international competitiveness.
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