Multi-tape parallel high-temperature superconducting coil current lead structure

Abstract

The invention discloses a multi-tape parallel high-temperature superconducting coil current lead structure comprising a superconducting tape, a current lead main body and a cover plate, wherein one end of the current lead main body is provided with at least two lead steps; superconducting tapes are connected to the lead steps; step sidewalls are disposed on the three sides of each lead step; the cover plate is embedded in the step sidewalls; and the other end of the current lead main body is provided with a through hole. Each superconducting tape is soldered to the current lead main body, so that the soldering resistance can be greatly reduced. The lead steps with the step sidewalls ensure that the soldering tin is not lost during the soldering process, and ensure the soldering strength. The cover plate makes the multilayer superconducting tapes evenly stressed during the soldering process, and less likely to be cracked in the melted soldering tin, and also avoids the residual bubblesin the molten soldering tin, thereby improving the soldering strength.

Description

technical field [0001] The invention relates to a current lead wire structure, in particular to a multi-band parallel high temperature superconducting coil current lead wire structure. Background technique [0002] High-temperature superconducting coils in superconducting power devices are generally used to transmit large currents. However, due to the limited current-carrying capacity of a single superconducting strip for making high-temperature superconducting coils, high-temperature superconducting coils usually use multiple superconducting strips connected in parallel. winding method. Furthermore, since the high-temperature superconducting tape is generally a rectangular cross-section conductor with a width of 4.5-14mm and a thickness of 0.2-0.3mm, when connecting to an external circuit, the high-temperature superconducting tape must be welded and fixed on the copper current lead. Problems to be solved for welding HTS tape to copper current leads include: [0003] (1) E...

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Problems solved by technology

[0008] (2) Since multiple superconducting strips are stacked together, during the welding process, in order to ensure that the uppermost superconducting strip can also reach a certain welding temperature, the temperature of the bottom superconducting strip must be higher, such as 3 layers When stacking and welding superconducting strips in common stainless steel packages, when the upper welding temperature reaches the required 190°C, the temperature of the lower copper leads and superconducting strips will exceed 200°C, which will easily lead to cracking and damage to the superconducting strips;

[0009] (3) When multiple superconducting strips are stacked and welded, only the bottom superconducting strips are welded together with the copper leads, and the other layers of superconducting strips are not directly connected to the copper leads. The welding strength is much higher than that between superconducting strips, resulting in a substantial decrease in the overall connection strength

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