November 24, the strong cooling since winter, so that located in Wuhan, Hubei National Grid UHV AC test base within the GIL test pipe wall covered with ice. In less than half a year, this UHV GIL test section has undergone tests of extreme weather such as heat, flood and low temperature, and has been running smoothly and normally. This makes the GEL transmission pipeline project research team of China Electric Power Research Institute feel more excited. Extra high pressure Fill the international gap August 16, Huainan - Nanjing - Shanghai 1000 kV UHV AC Transmission Project Sutong GIL integrated pipeline project started. This is the first time in the world that UHV GIL technology is used in important power transmission channels and crossed the Yangtze River through the river tunnel. It is the GIL innovation project with the highest voltage level, the largest transmission capacity and the highest technical level in the world. GIL (gas-insulated metal enclosed transmission line) is a gas-insulated metal enclosed transmission line, which is a kind of high-voltage, high-current, long-distance electric power with SF6 or other gas insulation coaxially arranged by a shell and a conductor Transmission equipment, with a large capacity, low loss, small footprint, high reliability, small maintenance, long life, small environmental impact and other significant advantages. Prior to this, the State Grid Corporation of science and technology around the special pressure GIL has already started, and made major breakthroughs. In June 2014, the first project "Development of UHV AC GIL Transmission Pipeline with Mixed Gas Insulation", a major science and technology project of the Company, was started in "Research on Development and Charged Examination of UHV GIL Test Sections". The project was led by China Electric Power Research Institute , North China Electric Power University, Xi'an Jiaotong University involved in the completion. A major research feature of this project is the use of environmentally friendly hybrid insulation gas. "SF6 gas is a greenhouse gas recognized by international organizations and long-distance GIL transmission pipelines have a great demand for gas-insulated media, so it has always been the main research direction for GIL to use mixed gases to reduce the use of SF6." China Electric Power Research Institute At present, AZZ and Siemens have introduced SF6 / N2 mixed gas products on 550 kV and 220 kV GIL. The voltage level of UHV GIL has nearly doubled. In this case, the study on discharge characteristics, mixing ratio and inflation pressure of mixed gas is still blank in the world. Achieve technology leadership Technology always walk in front of the project. For the Sutong GIL integrated pipe gallery in the world's first difficult project, the significance of science and technology to lead is particularly significant. "Initially, this project was just started as a research project for the 13th Five-Year Plan period. It did not take so long to apply it in construction projects. This means that it will be even more arduous task to quickly turn scientific research projects into engineering application projects." "UHV GIL test section of the development and charged with the assessment of" project leader, China Electric Power Research Institute High Voltage Institute Party Secretary Wang Xiaoqi said. Combined with the actual project of GTI integrated pipe gallery, the project team conducted key research in the following fields: - GIL insulation characteristics and insulation design research, including the insulation properties of GIL with SF6 / N2 gas mixture, UHV AC GIL insulation structure design and electric field optimization technology research, UHV AC GIL insulation optimization research and mixed gas environment insulation Insulation properties; - Study on GIL flow capacity of UHV AC, including GIL long-term flow capacity, flow characteristics and influencing factors and GIL structural optimization considering flow capacity; Mooring Rope include polyamide fiber series, polyester, resin series, UHMWPE, etc. The products in terms of structure include 3-ply, 4-ply, 6-ply, 8-ply, 12-plyand 48-ply (double-layer braided) with the diameters ranging between 4mm and 146mm for your option. All mooring ropes have wide range of application with the high strength, low elongation, wearing resistance and anti-corrosion.They are soft, smooth and easy for operation. Meanwhile.
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