High-temperature superconductivity current limiting fuse

Abstract

The invention provides a high-temperature superconductivity current limiting fuse. A parallel-connected high-temperature superconductivity fuse (2) is connected in parallel with a conventional reactor (1) through a first normally-closed rapid switch (4) and a second normally-closed switch (5). A spare high-temperature superconductivity fuse (3) is connected in parallel with the conventional reactor (1) and keeps an off-state through a first normally-opened rapid switch (6) and a second normally-opened switch (7) at the both ends of the spare high-temperature superconductivity fuse (3). A measurement and control device (9) is used for detecting a circuit current condition through a current sensor (8) and controlling the first normally-closed rapid switch (4), the second normally-closed switch (5), the first normally-opened rapid switch (6) and the second normally-opened switch (7) to open and close according to the current condition. The parallel-connected high-temperature superconductivity fuse (2) and the spare high-temperature superconductivity fuse (3) are the same in structure.

Description

technical field [0001] The invention relates to a fault current-limiting fuse, in particular to a short-circuit fault current-limiting fuse for a power transmission and distribution system. Background technique [0002] At present, in order to adapt to the rapid development of the national economy, the continuous increase of the scale of the power grid and the continuous improvement of the degree of interconnection, my country's power grid is developing in the direction of ultra-large scale. However, the stability problem of my country's power grid has become increasingly serious, and the security and reliability of the power grid are under enormous pressure. Short-circuit faults are one of the serious faults that endanger the safety of power systems and cause huge economic losses. For example, the short-circuit current level of the power grid (especially 220kV and above voltage level) in my country's coastal economically developed areas has approached or even exceeded the m...

AI Technical Summary

Problems solved by technology

Resistive high-temperature superconducting current limiter based on the second-generation high-temperature superconducting tape (IEEE Transactions on Applied Superconductivity, vol.19, no.3, 2009, pp1950; IEEE Transactions on Applied Superconductivity, vol.21, no.3 , 2011, pp1206) can effectively solve the above problems by using the quench resistance current limiting of high-temperature superconductors, but it is still in the research and development stage and requires a large number of high-temperature superconductors, which are expensive and complex in structure

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