Good news came from SHDL Cable Research Institute Co., Ltd .: The demonstration project of the localized kilometer-level superconducting cable passed the type test, which means that this Shanghai Municipal Government and the State Grid have carried out an important project of strategic cooperation in the technology industry, and a strategic emerging industry project in Shanghai With breakthrough progress, kilometer-level superconducting cables came out of the laboratory and entered the formal production stage.
High temperature superconducting power transmission, known as a revolution in the power industry in the 21st century, is the most potential power engineering technology. "Compared with traditional cables, high-temperature superconducting power transmission has a large current carrying capacity and a small volume. One superconducting cable can withstand several traditional cables, but the resistance is negligible, which means that the space occupied by the cable can be reduced by multiples, but the transmission efficiency Multiplied. "Zong Xihua, the project leader and deputy general manager and deputy chief engineer of SHDL Cable Research Institute Co., Ltd. explained that high-temperature superconducting technology can effectively save energy. Copper or aluminum conductors are used to transmit electricity, with about 7% of the electricity The loss is on the transmission line. In China, the annual power loss is more than 100 billion degrees; if it is converted to superconducting power transmission, the energy saved is equivalent to dozens of large-scale power plants.
For Shanghai, a very large city, high-temperature superconducting cables can play the advantages of large current capacity and small size in urban power grid transformation and power expansion, and in urban old power grid transformation, especially power expansion and capacity expansion in narrow spaces It has become a more optimized solution; it can also take advantage of the advantages of high-temperature superconducting power transmission, which basically has no electromagnetic radiation, high system reliability, energy saving and environmental protection, and reduces the difficulty of project implementation. Therefore, according to the layout plan of Shanghai Power Grid, a superconducting cable demonstration project with a total length of 1.2 kilometers will be built between two 220kv substations in Xujiahui area, and it is expected to be completed and energized by the end of 2020.
Since 2000, SHDL Cable Research Institute has targeted superconducting cables, a world-class cutting-edge technology and cutting-edge field. It has independently developed the first domestic high-temperature superconducting cable with a voltage level of 35 kV and an operating current of 2000 amps, and it has been demonstrated in Baosteel. . However, the previously developed high-temperature superconducting cable was only 50 meters in length, and now it is necessary to build a line with the same current carrying capacity and a length of 1.2 kilometers in Xujiahui. High, more difficult, and more uncertain.
To this end, SHDL Cable Research Institute has formed a team of technical experts around high-temperature superconducting cables to tackle technical difficulties. "The high-temperature superconducting cable is not a 'special wire', but an extremely complicated system with a diameter of about 18 cm. The so-called 'high temperature' is actually a relative concept, which is a liquid nitrogen environment at nearly minus 200 degrees Celsius." Zong Xihua It is said that high-temperature superconducting cables are an area where perfection is pursued. In the complex structure of superconducting cables, the core is two or thirty superconducting tapes that are only 0.4 mm thick and extremely delicate, from design to material to production process.
The cables required for the demonstration project have entered the manufacturing stage, and the manufacture of key components such as the first energized conductor and three return pipes has been completed. "The construction of a high-temperature superconducting cable demonstration project in Xujiahui can comprehensively and systematically verify the reliability, stability and practicality of China's independent high-temperature superconducting technology coupled with the power grid in the central urban area of megacities, and promote the high-temperature superconducting technology Industrial application in power grid transformation. "Zong Xihua said that in the new revolution of high-temperature superconducting power transmission, the demonstration project is like a pilot test. Once Shanghai goes through, it not only means that China has independently mastered high-temperature superconductivity. The core technology of power transmission has the ability to promote the large-scale application of superconducting materials in the field of power transmission and distribution, and will enable superconducting this new industry to settle in Shanghai and form clusters to help Shanghai build a technologically innovative center with global influence.