The new superconducting current limiter was successfully developed

The 35kV superconducting current limiter of the municipal science and technology innovation special fund project jointly undertaken by Tianjin Electromechanical Industry Holding Group Co., Ltd. and Beijing Yundian Yingna Superconducting Cable Co., Ltd. was successfully developed. The Phuket Substation in Yunnan Province was commissioned for grid-connected trial operation yesterday. According to experts, the 35kV superconducting current limiter is the world leader in this type of current limiter technology. It is the superconducting current limiter with the highest voltage level and largest capacity in the world.

As the scale of the power grid continues to expand, the degree of interconnection of the power grid is getting higher and higher. However, when a momentary strong fault current occurs due to an accidental short circuit or grounding at a certain point in the transmission network, it often causes equipment burnout, personal injury and death and large-scale blackout.

The saturated iron core type superconducting current limiter is excited by a superconducting coil, and its superconducting characteristic is used to transform the traditional magnetron reactor to make it operate with low impedance and fault current limiting high impedance, which becomes a new short-circuit current solution, especially in It has an irreplaceable advantage in high-voltage and ultra-high voltage power grids and is a safe and stable current limiting device. The electromechanical group fully utilized the advantages of the industrial technology platform, and cooperated with Beijing Yundian Yingna Superconducting Cable Co., Ltd. to select the saturated iron core type superconducting current limiter as the breakthrough of superconducting force application, and fully developed and developed the 35kV and 220kV prototypes. In particular, it has achieved a major breakthrough in key technologies such as quick-break DC, core cross-section and voltage clamping, and mastered the key technology of superconducting current limiter with world leading level and independent intellectual property rights, greatly reducing the volume of the restrictor. , weight and cost, running loss is only one-tenth of the traditional equipment. Currently, the device has applied for 8 patents.

The successful development of the 35kV superconducting current limiter has established the city's leading position in this field, marking the level of China's superconducting power application technology to a new level. At present, "research and development of 220kV high temperature superconducting current limiter" It has been included in the national “Eleventh Five-Year Plan” 863 Program Support Project and is expected to be connected to the grid in 2009.