The 35kV superconducting current limiter, a key project under the municipal science and technology innovation special fund, has been successfully developed through a joint effort between Tianjin Electromechanical Industry Holding Group Co., Ltd. and Beijing Yundian Yingna Superconducting Cable Co., Ltd. The device was recently commissioned at Phuket Substation in Yunnan Province for grid-connected trial operations. According to industry experts, this 35kV superconducting current limiter represents the world's leading technology in its category, being the highest voltage-level and largest-capacity superconducting current limiter globally. As power grids continue to grow in scale and become more interconnected, the risk of sudden fault currents caused by short circuits or grounding issues increases. These events can lead to equipment damage, personal injuries, and even large-scale blackouts. To address this challenge, the saturated iron core type superconducting current limiter has emerged as an innovative solution. Powered by a superconducting coil, it leverages superconducting properties to switch from low-impedance operation under normal conditions to high-impedance during faults, effectively limiting short-circuit currents. This technology offers significant advantages, especially in high-voltage and ultra-high-voltage power networks, providing a safe and stable means of current limitation. Tianjin Electromechanical Industry Holding Group utilized its industrial technology platform to collaborate with Beijing Yundian Yingna Superconducting Cable Co., Ltd. on developing this breakthrough. Together, they have created prototypes for both 35kV and 220kV systems. Key technological advancements include rapid DC interruption, optimized core cross-sections, and voltage clamping techniques. This has led to a world-leading superconducting current limiter with independent intellectual property rights, significantly reducing size, weight, and cost while cutting operational losses to just one-tenth of traditional equipment. The project has already filed eight patents. The successful development of the 35kV superconducting current limiter has solidified the city’s leadership in this field, marking a major milestone in China’s superconducting power application technology. Currently, the “Research and Development of 220kV High Temperature Superconducting Current Limiter” has been included in the national "Eleventh Five-Year Plan" 863 Program. It is expected to be connected to the grid by 2009, further advancing the country’s capabilities in next-generation power technologies.

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