A high temperature superconducting resistance current limiter, skeleton and superconducting tape winding method

Abstract

The invention discloses a skeleton of a high-temperature superconducting resistance type current limiter, which comprises a plurality of supporting insulating upright posts arranged in parallel with each other and provided with spacing, a plurality of strip fixing members with the same number and the same spacing are distributed along the length direction on each supporting insulating upright post, and the distance between adjacent strip fixing members on the same supporting insulating upright post is longer than the width of the superconducting tape; The left chassis and the right chassis areused for fixing both ends of the supporting insulating upright posts; The invention also discloses a winding method of a superconducting tape of a high-temperature superconducting resistance type current limiter and a high-temperature superconducting resistance type current limiter. The invention realizes the winding of the strip material by arranging upright posts on two chassis of the frame, The superconducting tape is tightly wound on the skeleton, and the chassis barrier is subtracted between each turn of the superconducting tape, and the superconducting tape is wound on the vertical column skeleton in multiple turns to form an organic whole, which provides more space and paths for the bubble dissipation caused by the quenching, optimizes the problem of bubble retention, and simplifies the overall structure.

Description

technical field [0001] The invention relates to the technical field of resistance current limiters, in particular to a high temperature superconducting resistance current limiter, a frame and a winding method for superconducting strips. 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 ...

AI Technical Summary

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.

Images