CN-122025279-A - Novel superconducting cable based on strip transposition braiding and braiding device thereof

CN122025279ACN 122025279 ACN122025279 ACN 122025279ACN-122025279-A

Abstract

The invention discloses a novel superconducting cable based on transposition braiding of superconducting tapes and a braiding machine thereof, the novel superconducting cable is made of a plurality of superconducting tapes, the strip is evenly divided into two groups, namely a clockwise group and a counterclockwise group, according to the winding direction of the strip on the framework, and is manufactured with the aid of a braiding machine in a transposition braiding mode. The novel superconducting cable complete transposition structure has the characteristics of uniform current carrying, low alternating current loss and high current carrying capacity, and the alternating current loss under a vertical magnetic field is obviously reduced. Unlike Robel transposition cables, the invention does not need to cut the superconducting tape in advance, avoids damage and waste of the tape, effectively solves the transposition problem of the superconducting cable tape, further improves the utilization rate of the superconducting tape, and provides a simpler, more efficient and more economical solution for manufacturing the superconducting cable with complete transposition. In view of the complexity of this knitting method, a corresponding auxiliary knitting of the knitting machine is designed.

Inventors

ZHOU DINGKAI
PI WEI

Assignees

华北电力大学

Dates

Publication Date: 20260512
Application Date: 20251205

Claims (3)

1. Novel superconducting cable based on superconducting tape transposition braiding and braiding device thereof. N strips are divided into two groups, wherein N is an even number, one group is named as a clockwise group, the other group is named as a counterclockwise group, when a cable is wound, the two groups of strips are respectively wound into bobbins of a braiding machine, then the strips are pulled out of the bobbins and fixed at one end of a pre-designed cylindrical framework, are respectively spirally wound on the framework in the clockwise direction and the counterclockwise direction with the aid of the braiding machine, and are mutually alternated, so that the positions of each strip in the cable are completely identical.
2. The novel cable construction based on complete transposition of the transposition braid of superconducting tapes according to claim 1, characterized in that the tapes are to be helically wound in clockwise and anticlockwise direction respectively, mutually alternated with transposition, eventually forming a novel cable without "layer" structure.
3. A braiding machine for braiding a novel superconducting cable according to claim 1, wherein the braiding machine is divided into three layers: (1) A circular base for installing other parts, design has the gear shaft that is used for placing the gear train on it to and fix the screw hole site of outermost. (2) The gear is provided with a groove for placing a slider and a spool which are directly connected with the belt material. (3) The inner and outer constrainers and the diverter are used for controlling the sliding blocks to turn, so that the sliding blocks do reciprocating motion along the radial direction while doing approximate circular motion in the braiding machine, and therefore the interpenetration transposition among the sliding blocks is achieved, and the interpenetration transposition of the strips is achieved.

Description

Novel superconducting cable based on strip transposition braiding and braiding device thereof Technical Field The invention belongs to the field of superconducting electricians, and particularly relates to a novel superconducting cable based on tape transposition braiding. Background As the voltage level increases gradually, once the power system fails, the damage to the power transmission line caused by the fault impact is greater. In the actual situation, the superconducting cable made of the high-temperature superconducting material with the working temperature of liquid nitrogen of 77K is used for transmitting current, so that the contradiction can be effectively solved. The superconducting cable has the advantages of low voltage level, large transmission capacity, low line loss, no environmental pollution, small occupied area and the like, and has important significance in building a novel power system and modifying an old power system. However, various high-temperature superconducting cables developed at home and abroad have a remarkable defect that the superconducting tapes are not transposed in the manufacturing process of the superconducting cable, so that the current distribution is uneven, the critical current attenuation is large, and the alternating current loss is large. In order to solve the problem, the research center of German Karl-Ruembodiments proposes a Roebel conductor/cable of a completely transposed conductor composed of second-generation high-temperature superconducting tapes, which is assembled by mutually transposed superconducting tapes cut into a trapezoid shape. The Roebel conductor can realize complete transposition, has the characteristics of uniform current carrying, low alternating current loss and high current carrying capacity, and obviously reduces the alternating current loss under a vertical magnetic field, but has the defects of high magnetic field of a vertical band surface and serious reduction of critical current. Under the condition of current carrying of the same size, the Roebel conductor needs to cut the superconducting tape before manufacturing, so that the tape waste is serious, the cost is high, the mechanical property is poor, and further research is still needed. The invention discloses a novel superconducting cable based on transposition braiding of a superconducting tape, which effectively solves the transposition problem of the superconducting cable tape, and unlike Robel transposition cables, the novel superconducting cable does not need to cut the superconducting tape in advance, avoids damage and waste of the tape, further improves the utilization rate of the superconducting tape, and provides a simpler, more efficient and more economical solution for manufacturing the superconducting cable with complete transposition. Disclosure of Invention The invention aims to develop a novel superconducting cable based on transposition braiding of a superconducting tape, enhance transposition function and mechanical property of the superconducting cable, improve current distribution in the cable, reduce attenuation and transmission loss of critical current, and manufacture the transposition cable based on the transposition braiding of the superconducting tape, so that the tape can be fully utilized, and economic benefit is improved. N superconducting tapes are equally divided into two groups, wherein N is an even number, one group is named as a clockwise group, the other group is named as a counterclockwise group, and when a cable is wound, the two groups of tapes are spirally wound on a pre-designed cylindrical framework in the clockwise and counterclockwise directions respectively and are mutually alternated, so that the positions of each tape in the cable are completely identical. Since this knitting method is complicated, a corresponding knitting machine is designed for auxiliary knitting. The novel superconducting cable based on the transposition braiding of the superconducting tapes and the braiding device thereof are characterized in that the superconducting tapes are respectively spirally wound in the clockwise direction and the anticlockwise direction, and the transposition is mutually alternated, so that the novel superconducting cable which abandons the traditional layer structure is finally formed. The specific operation flow is as follows: (1) The superconducting tape is fully wound into the bobbin of the braiding machine, a pre-designed cylindrical former is then installed at the center of the braiding machine, and one end of the tape is then pulled out of the bobbin and secured to the distal end of the former. (2) The gear set of the braiding machine is driven to rotate by manpower or a motor, and the sliding block arranged on the gear set can perform approximate circular motion taking the axis of the braiding machine as the center of a circle and continuously perform reciprocating motion along the radial direction. According to the difference of