Resistance-type high-temperature superconducting fault current limiter

Abstract

A resistance-type high-temperature superconducting fault current limiter comprises a superconducting non-inductive winding (2), a liquid nitrogen cycle container (3), a liquid nitrogen pump (4), a gaschamber (5), a small emptying valve (6), a large emptying valve (7) and a current lead (8); wherein the liquid nitrogen pump (4) is arranged at the bottom of the liquid nitrogen cycle container (3);the small emptying valve (6) and the large emptying valve (7) are arranged parallelly on an end plate at the top of the liquid nitrogen cycle container (3), both the small emptying valve (6) and the large emptying valve (7) are pressure adjustment and control fittings in liquid nitrogen operation; the superconducting non-inductive winding (2) is connected with one end of the current lead (8), theend of the current lead (8) and the superconducting non-inductive winding (2) are arranged in the liquid nitrogen cycle container (3); and the other end of the current lead (8) is leaded outside of the liquid nitrogen cycle container (3) to be connected with a power grid. Through adoption of the resistance-type high-temperature superconducting fault current limiter of the invention, liquid nitrogen is forced to flow by the liquid nitrogen cycle container and the liquid nitrogen pump, so as to quickly take away bubbles wrapping the superconducting non-inductive winding.

Description

technical field [0001] The invention relates to a resistance type fault current limiter. Background technique [0002] With the rapid development of the national economy, the scale of my country's power grid continues to increase and the degree of interconnection continues to improve, and the proportion of grid-connected renewable energy such as wind energy is also gradually increasing. At the same time, the stability of the power grid has become increasingly serious, and the security and reliability of the power grid are under tremendous pressure. Short-circuit faults are one of the serious faults that endanger the safety of power systems and cause huge economic losses. The resistance-type high-temperature superconducting current limiter based on the second-generation high-temperature superconducting tape uses the quench resistance of the high-temperature superconductor to limit the current, which can effectively solve the above problems and has good application and market ...

AI Technical Summary

Problems solved by technology

When the liquid nitrogen does not flow, a large number of bubbles wrap around the superconducting winding, seriously blocking the winding to continue to dissipate heat, and it is easy to overheat and burn the superconducting strip; because the insulation strength of nitrogen is much lower than that of liquid nitrogen, it is easy to damage the winding Insulation properties of the system

This is very harmful and destructive to the application of resistive superconducting current limiters

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