Superconducting current limiting unit adopting stranded conductor

Abstract

A disclosed superconducting current limiting unit adopting a stranded conductor comprises a base, a current limiting framework is fixedly connected to the top end of the base, a plurality of superconducting stranded bodies are wound around the current limiting framework, and every two adjacent superconducting stranded bodies are electrically connected through a current lead; the superconducting stranded conductor comprises a stainless steel stranded wire framework, a plurality of superconducting tapes are wound on the outer surface of the stainless steel stranded wire framework, the superconducting tapes are wound at the same spiral angle, the same spiral direction and the same screw pitch, and the superconducting tapes are connected in parallel. A plurality of superconducting tapes are wound on the stainless steel stranded wire framework to form a superconducting stranded conductor, the plurality of superconducting tapes are connected in parallel to increase the current-carrying capacity, the superconducting stranded conductor is wound on the current-limiting framework to form a coil, and sufficiently high current-limiting resistance is provided to form a superconducting current-limiting unit; when the superconducting tape is not super when encountering with short-circuit current, short-circuit current can be shunted along the stainless steel stranded wire, and heat generated by the superconducting tape is reduced.

Description

technical field [0001] The invention relates to the technical field of superconducting current limiting, in particular to a superconducting current limiting unit using stranded conductors. Background technique [0002] With the development of society and economy, people's demand for electricity is increasing year by year, and the installed capacity and voltage level of the power grid are also getting higher and higher. The short-circuit current of the power grid is too large, even exceeding the maximum capacity of the circuit breaker, which poses new challenges to the safety and reliability of the power system operation. The current limiter is added to the grid operation as a power device that effectively limits the fault current. [0003] The superconducting current limiter has little impact on the power grid during normal operation, and has low loss. When a fault occurs, it can respond quickly, effectively limit the fault current, and limit the fault current within the br...

AI Technical Summary

Problems solved by technology

[0004] However, since the quenching of the superconducting tape in the existing superconducting current limiter will cause the failure of the entire superconducting current limiting unit, the entire superconducting current limiting unit needs to be replaced, resulting in an increase in cost; and the existing superconducting current limiting unit The heat transfer efficiency of the current-limiting unit is insufficient, resulting in the reliability of the entire superconducting current-limiting unit cannot be well guaranteed

Images