Superconducting current limiter unit module of double-sided YBCO (Yttrium Barium Copper Oxide) film structure

Abstract

The invention discloses a superconducting current limiter unit module of a double-sided YBCO (Yttrium Barium Copper Oxide) film structure. The superconducting current limiter unit module comprises a double-sided YBCO film and a shunt resistor, wherein the double-sided YBCO film is the main body of a superconducting current limiter, and the flexibility and integration of a space design of the current limiter are improved by the double-sided and multi-layer structure of the YBCO film; and the shutdown characteristics of the current limiter are improved by the unique thermal characteristics and electromagnetic properties of the double-sided and multi-layer structure. The superconducting current limiter unit module provided by the invention is suitable for series-connected work of multiple modules, the overall structure can bear higher current and voltage levels, and the modules work together, so that the fault short circuit current can be rapidly and effectively limited.

Description

technical field [0001] The invention relates to a superconducting switch element, in particular to the technical field of a resistive superconducting fault current limiter. Background technique [0002] With the development of economy and society, the demand for electricity keeps increasing; at the same time, the capacity of the power grid keeps expanding. With the increasing capacity of the power system and grid-connected transmission, the potential short-circuit power and fault short-circuit current of the grid are also increasing, and the potential short-circuit current impact on various electrical equipment in the grid is also increasing. The requirement for the capacity of large current impact is getting higher and higher, which brings a series of problems to the construction and operation of the power system. Replacing a large-capacity circuit breaker and improving the safety of the power grid will greatly increase the cost; more importantly, the current limiting leve...

AI Technical Summary

Problems solved by technology

The breaking speed of the superconducting current limiting element is generally required to be fast and uniform, but in the assembled and integrated resistive current limiter, it is difficult to achieve the overall quenching in a short time, if the breaking performance is not formed uniformly along the length of the superconductor If it is only local, it cannot effectively transfer the current to the shunt resistor, so that the hot spot on the superconductor will continue to develop and cause the conductor to break

In order to avoid damage to the current limiting device, these local hotspots must quickly spread to the entire plane through heat conduction, or conduct heat exchange with the external low temperature environment, and dissipate the heat to the outside of the conductor; There are high requirements, and a large amount of heat dissipation will reduce the off resistance of the current limiter, and there will be a large residual current in the current limiting circuit

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