Double-helical superconductive resistor type current limiter, framework and superconductive strip winding method

Abstract

The invention discloses a framework of a double-helical superconductive resistor type current limiter. The framework includes multiple supporting insulating columns arranged parallel to each other andprovided with space, a left chassis and a right chassis, wherein the supporting insulating columns are helically arranged from the inside to the outside to form a double-helical structure, and the left chassis and the right chassis are used for fixing two ends of the supporting insulating columns. The invention further discloses a double-helical superconductive resistor type current limiter superconductive strip winding method and the double-helical superconductive resistor type current limiter. Winding of the strip is realized by arranging the columns on the two chassis of the framework to form a double-helical structure, the superconductive strip is tightly wound on the framework, the winding number of loops and the winding method can be customized according to requirements, through superconductive strips of different lengths, the more space and paths are provided for dissipation of bubbles caused by quenching, a problem of bubble retention is ameliorated, the combination welding process of a coiled coil is omitted, and the overall structure is simplified.

Description

technical field [0001] The invention relates to the technical field of resistance current limiters, in particular to a double-helix superconducting resistance current limiter, a skeleton and a superconducting tape winding method. Background technique [0002] With the rapid development of my country's economy and society, the load and capacity of the power grid are also expanding accordingly. Once a short-circuit fault occurs in the power grid, the huge short-circuit current will cause serious damage to power equipment. Therefore, in order to maintain the safety and reliability of the grid power supply, the short-circuit current must be suppressed. The introduction of a current limiter in the grid is currently the most common and effective measure. [0003] The resistance type high temperature superconducting current limiter based on the second generation high temperature superconducting tape has a simple structure and principle, and uses the quench resistance of the high te...

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Problems solved by technology

[0004] The main problems of the above-mentioned resistive high-temperature superconducting current limiter are: (1) The quenching of the high-temperature superconducting strip will generate a large amount of heat, which will cause the liquid nitrogen to boil and generate a large number of bubbles, which exist between the strip and the strip. Due to the tooth-like trapezoidal structure of the skeleton used for inter-turn insulation, a large number of bubbles generated by the quench will be trapped in the micropores formed by the sealing of the high-temperature superconducting tape and the skeleton, which will reduce the contact between the surface of the superconducting tape and liquid nitrogen. The heat transfer area increases the heat transfer resistance, resulting in prolonged quench reheating time

And the existence of bubbles will reduce the electrical insulation of the system, endangering the safe and stable operation of the system

(2) The traditional insulating frame used for insulating support can only provide radial support for the superconducting strip, and the lateral support needs to be fixed by the large hub wheel installed on both sides of the superconducting strip, and the large hub wheel is due to its structure, the superconducting tape located in this part will be "sealed" between the hub and the wheel, and the only horizontal escape path for the air bubbles in the micropores formed by the sealing of the high-temperature superconducting tape and the skeleton is blocked by the hub and the wheel, forming bubbles that cannot escape. out of the "dead zone"

Quench reheating of extremely degraded superconducting tapes

(3) The traditional trapezoidal insulating skeleton and the strip are fixed in surface contact, and nearly half of the surface area of ​​the strip cannot be directly contacted with liquid nitrogen

Secondly, the traditional winding method often requires multiple sets of disk-mounted coil blocks to be connected in series to the power grid. The welding process between coils is complicated and error-prone, and the structure of multiple sets of coils is cumbersome, taking up a lot of space and wasting materials.

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