China's first high-temperature superconducting current limiter passed the test before the grid connection, and successfully invested in the test operation of Gaoxi Substation of Loudi City Electric Power Bureau of Hunan Province. Its main technical performance indicators have reached the international advanced level and become the Swiss advanced. After Germany, the United States, the fourth high-temperature superconducting current limiting device incorporated into the actual grid test operation.
As a kind of effective short-circuit current limiting device, the high-temperature superconducting current limiter can quickly limit the short-circuit current to an acceptable level in the event of a short-circuit fault, thus avoiding the large short-circuit current in the power grid posing a serious hazard to the power grid and electrical equipment. It can greatly improve the stability of the power grid and improve the reliability and safety of the power supply.
According to Xiao Liye, deputy director of the Institute of Electrical Engineering of the Chinese Academy of Sciences, the project researchers adhered to the road of independent innovation, and obtained independent intellectual property rights in the principle and core technology of high-temperature superconducting current limiters, and improved the high-temperature superconducting current limiter. The flexibility allows it to adapt to a wide range of application requirements. Since the device was put into operation in August 2005, the device has been operating safely and stably for more than 4 months and has been tested for 3 short-circuit faults. The test operation shows that the current limiting device can not only greatly reduce the short-circuit fault current, but also has the advantages of fast response speed, fast recovery speed and small normal voltage drop. While increasing the safety and stability of the power grid, it can increase the transmission capacity of the power grid and improve the power quality, and can significantly reduce the capacity of the circuit breaker, greatly reduce the construction cost and modification cost of the power grid, and prolong the life of the electrical equipment.
The project was jointly funded by the National "863" Program, the Chinese Academy of Sciences Knowledge Innovation Project and the Beijing Major Science and Technology Project, and was supported by Beijing as one of the breakthroughs in promoting the industrialization of superconducting technology during the Tenth Five-Year Plan period. The implementation of the project has concentrated on the domestic strengths in related technical fields. It is led by the Institute of Electrical Engineering of the Chinese Academy of Sciences, and the Institute of Physics and Chemistry of the Chinese Academy of Sciences, Hunan Electric Power Research Institute, Hunan Electric Power Company, Sichuan Yaxi Low Temperature Equipment Company, Hunan Province. The Loudi City Electric Power Bureau and other units jointly completed.
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