High-temperature superconducting power transmission is one of the advanced technology frontiers currently researched and developed in the power industry, and is known as "the next generation of power transmission strategic technology." The so-called high temperature superconductivity refers to the use of superconducting materials to achieve low-voltage large-capacity power transmission in a liquid nitrogen environment close to -200°C relative to absolute zero. Recently, in this technical field, China has ushered in a new breakthrough.
China's first 10-kV three-coaxial high-temperature AC superconducting cable type was successfully tested in Shenzhen a few days ago, and it is the world's first superconducting cable demonstration project used in high-load density power supply areas.
The project is a major science and technology project of China Southern Power Grid. It is expected to be completed and put into production in Shenzhen within this year, and the project will realize 100% localization of key equipment.
In high-temperature superconducting technology, China has continuously made historical breakthroughs in recent years. In April 2020, the 35 kV kilometer-level high-temperature superconducting cable demonstration project built by the State Grid of China has started in Shanghai. After its completion, the project has become the 35 kV superconducting cable project with the world's largest transmission capacity, longest distance, and fully commercial operation.
Throughout the world, the development of superconducting cable technology has a history of more than 20 years. Currently, this technology is mainly grasped by China, the United States, Japan, South Korea and Europe.
In 1992, with the support of the U.S. Department of Energy, U.S. companies began to research and develop superconducting cable technology, making the United States the first country to develop superconducting cable technology; by the end of 1999, superconducting cables began to be integrated in the US power grid. Network operation.
In Europe, Denmark first announced the realization of superconducting cable network operation in 2001. Since then, France and Italy have also carried out the technical development of superconducting cables. However, due to the decrease in investment in recent years, the development of technology in this field in Europe has gradually slowed down. In general, with China's continuous breakthroughs in this field, China has been among the forefront of international superconducting cable technology.