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It is estimated that by 2020, the total market for superconducting applications in the world will reach 244 billion U.S. dollars, and high-temperature superconducting cables will account for about 5% of the total. As an important part of special cables, high-temperature cables have extremely strong vitality and are in short supply. China imports about two billion yuan from abroad for domestic construction each year. Due to the adoption of high-temperature superconducting materials with high transmission current density as conductors and liquid nitrogen as the cooling medium, high-temperature superconducting cables have the advantages of small size, light weight, low loss, no fire hazard, etc., and transmission loss of conventional power cables is approximately The transmission power is 7%, while the transmission loss of the high-temperature superconducting power cable is only 0.5%. If the energy consumed by cooling is taken into account, the final energy saving will be over 60%; in the case of the same weight and size, the conventional power cable In comparison, the capacity of high-temperature superconducting cables can be increased by 3 to 5 times, the loss can be reduced by 60%, and the weight can be reduced by more than 80%. It is suitable for applications where short-distance transmission of large currents is required, such as urban center distribution, electroplating and electrolysis industries. , power plants and substations. The cable industry has been in a state of vicious competition for a long time. The application of superconducting technology gives cable companies a chance to surpass their competitors and how their development will depend on the capacity of the cable market to absorb.
China's high-temperature cable research and development level
Superconducting cables have broad application prospects in the occasions where large currents are transmitted over a short distance (such as city center distribution, power plants and substations), and their economic benefits are considerable. The use of superconducting cables to retrofit existing underground cable systems can reduce total costs by 20%. Therefore, due to its superiority, superconducting cables are a good alternative to conventional cables in the process of upgrading and augmenting urban power grid facilities. According to statistics, the annual demand for cross-linked polyethylene insulated power cables of 10 kV and above in China is approximately 70,000 to 80,000 kilometers. If 5% of its total volume is replaced by superconducting cables, the annual potential demand for superconducting cables will increase. The total volume will reach 3,500 to 4,000 kilometers. With an average of RMB 2 million per kilometer, the potential market is 8 billion yuan. If you increase at a rate of 7.5% per year, the potential market in 2012 will reach 18 billion yuan. If the market share of the product reaches 10%, the annual output value can reach about 1.8 billion yuan. The market for global superconducting cables in 2012 is estimated to be approximately US$1.7 billion. At present, the research and development level of China's high-temperature cables is far from meeting the needs of new markets. China's technology in this respect lags behind that of advanced foreign countries. Nearly half of the high-temperature cables need to be imported from abroad, while some domestic manufacturers are concentrated in some small factories. Technological development and production capacity are relatively weak. In particular, production and processing are still limited to existing equipment and tooling of cables, and the development of materials has failed to break through the circle of existing cable materials. It is hoped that domestic manufacturers capable of developing high-temperature special cables can assess the situation, develop and popularize high-temperature series cables in light of China's resources, and increase China's level in this technical field to meet the needs of China's high-temperature industries.