CN102456445A - Winding method of nb3sn superconducting cable of large-size superconducting magnet - Google Patents
Winding method of nb3sn superconducting cable of large-size superconducting magnet Download PDFInfo
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- CN102456445A CN102456445A CN2012100013835A CN201210001383A CN102456445A CN 102456445 A CN102456445 A CN 102456445A CN 2012100013835 A CN2012100013835 A CN 2012100013835A CN 201210001383 A CN201210001383 A CN 201210001383A CN 102456445 A CN102456445 A CN 102456445A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a winding method of an nb3sn superconducting cable of a large-size superconducting magnet. The method comprises the following steps that: a superconducting cable is formed by winding and twisting four stage sub-cables, wherein a first-stage sub-cable is twisted by using three superconductors or a mode of combining the superconductor with a copper wire; a second-stage sub-cable is formed by twisting three or four first-stage sub-cables, and a nb3sn superconducting piled yarn and the copper wire are combined by using a mixing mode in the first-stage and second-stage sub-cables; a third sub-cable is formed by twisting three or four second-stage sub-cables; a fourth-stage sub-cable is formed by twisting three or four or five third-stage sub-cables; and the surface of the fourth-stage sub-cable is overlaid by using stainless steel with the thickness of 0.05mm so as to make the nb3sn superconducting cable. According to the invention, longer torque is adopted in the former three stages of sub-cables, and shorter torque is adopted in the last-stage sub-cable; and a cable conductor in a pipe made by using the nb3sn superconducting cable can reduce even eliminate the deterioration of superconductor property caused by electromagnetism circulation.
Description
Technical field
The present invention relates generally to the superconducting magnet technical field, is specifically related to a kind of winding method of niobium three tin hyperconductive cables of large-scale superconducting magnet.
Background technology
Pipe inner cable conductor is that niobium titanium or niobium three tin superconducting wires are become hyperconductive cable through multistage twisting, hyperconductive cable is penetrated in the stainless-steel pipe again, through undergauge, moulding, is made into pipe inner cable conductor, adopts supercritical helium or superfluid helium to compel the stream cooling.This method has improved the contact area of superconducting line and helium; Improved heat transfer condition; And make pipe inner cable conductor have characteristics such as good self-supporting, lower A.C.power loss, required coolant are few, safe and reliable to operation, performance height; Become the first-selected conductor of large-scale superconducting magnet, successful is applied in the middle of tokamak device, stellarator device and the large-scale high field super magnet.Yet; In the process that the niobium three tin-tube inner cable conductors of international thermonuclear fusion device ITER are researched and developed, find in recent years; After repeatedly electromagnetism circulated, irreversible performance degradation appearred in the superconductivity of niobium three tin superconducting conductors, and this will directly have influence on long-term stability operation of large-scale superconducting magnet.
Find through a large amount of experiments; Because niobium three tin materials after the heat treatment have very strong fragility; Lorentz force in the electromagnetism circulation makes superconducting conductor produce very big horizontal magnetic pressure; Cause the internal structure of niobium three tin materials that variation has taken place, produced trickle crackle in the part, thereby caused the degeneration of superconducting conductor performance.Therefore can not directly adopt the design concept of original niobium titanium pipe inner cable conductor; Need to improve again the pipe inner cable conductor of employing niobium three tin superconductors and the design of hyperconductive cable; Make it to have good self-supporting, minimizing even elimination are because the performance degradation that the electromagnetism circulation causes.
Summary of the invention
Be the irreversible performance degenerate problem that niobium three tin-tube inner cable conductors in the solution prior art occur after repeatedly electromagnetism circulates, producing can the large-scale superconducting magnet of moving steady in a long-term.
The present invention provides the winding method of the niobium three tin hyperconductive cables of the large-scale superconducting magnet of a kind of superconduction; Adopt niobium three tin superconduction strands and copper strand wire branch level Four to carry out twisting; What torque before increasing makes better contact between the strand in the hyperconductive cable had good self-supporting; Reduce the torque of hyperconductive cable afterbody simultaneously, reduce the A.C.power loss of superconducting conductor.
The niobium three tin hyperconductive cables of large-scale superconducting magnet provided by the invention; Also adopt niobium three tin superconduction strands and copper cash to mix the mode of taking; Both satisfied superconducting conductor to superconductor and the long-pending requirement of copper face; Guaranteed that also the superconduction strand in the inner even distribution of conductor, has also reduced the consumption of superconduction strand simultaneously, practiced thrift production cost.This method for designing makes the design of hyperconductive cable more flexible and practical.
The present invention adopts following technical scheme to achieve these goals:
The winding method of the niobium three tin hyperconductive cables of large-scale superconducting magnet is characterized in that may further comprise the steps:
(1) according to the needs of magnet heat protection after the requirement of the condition of work of superconducting conductor, superconducting magnet shunting temperature and the quench; Calculate the number of required superconduction strand and copper cash; And the composition mode of configuration hyperconductive cable, guarantee that superconduction strand and copper cash are in the inner evenly distribution of hyperconductive cable;
(2) first order stranded cable; Process the one-level cable by three superconduction strands or superconducting line and copper cash combination strand, utilize single twist cabling machine, adopt the mode of initiatively back twist to twist system; Cross mould and steady footpath; Torque is chosen as 32-34 that the one-level cable crosses diameter behind the mould doubly, and long torque has guaranteed good supporting between strand, thereby can guarantee that the hyperconductive cable in the superconducting magnet bigger displacement and distortion can not take place under the electromagnetic force effect; Adopt the mode of stress FEEDBACK CONTROL that the stress of each strand is regulated, guarantee that stress distribution is even between each strand, the pulling force that guarantees every strand simultaneously is less than 20N.
(3) second level stranded cable; Process the secondary cable by three to four one-level cable strands; Can adopt identical one-level cable; Also can adopt mixed the taking of one-level cable of different component to form, both satisfy the long-pending requirement of copper face of the superconduction area and the magnet quenching after heat protection needs of magnet needs current-carrying, save the consumption of superconduction strand again; Utilize single twist cabling machine, adopt the mode of initiatively back twist to twist system, cross mould and steady footpath, torque is chosen as 28-32 that the secondary cable crosses diameter behind the mould doubly; The position in reasonable disposition draw drum and unwrapping wire hole in the stranded cable process guarantees position distribution symmetry between each sub-cable.
(4) third level stranded cable is processed three grades of cables by the sub-cables strand of three to four secondarys, utilizes single twist cabling machine, adopts the mode of initiatively back twist to twist system, crosses mould and steady footpath, and torque is chosen as 20-22 that the secondary cable crosses diameter behind the mould doubly; Adopt the external diameter of measurement in real time of instruments such as girth chi, vernier caliper and laser diameter measuring instrument and monitoring cable.
(5) fourth stage stranded cable is processed the level Four cable by three to five three grades sub-cable strands, utilizes 1+6/1250 type cabler, adopts the mode of initiatively back twist to twist system; Adopt three road wolfram steel moulds that hyperconductive cable is pressed undergauge, make the voidage of cable reach 38-42%, to guarantee the even distribution of hyperconductive cable in superconducting conductor; The 14-16 that torque is chosen as diameter behind the level Four cable undergauge doubly, short torque has reduced the couple current loss between strand, thereby can reduce the A.C.power loss of superconducting magnet; Require hyperconductive cable not have wire jumper, not damaged, cable overall dimension is even, no ellipse or fried dough twist situation.
(6) level Four cable surface adopts the thick stainless steel band of 0.05mm to carry out the 45-55% stacked package, requires steel band smooth, does not crumple, and does not break; Thereby be made into niobium three tin hyperconductive cables.Assembling " drift " before the cable take-up, the outside dimension of online detection streamer is to guarantee the poling requirement.
The torque of hyperconductive cable of the present invention is generally selected 10-30 times of the sub-cable compression diameter of this grade for use; In preceding what sub-cable; Adopt the long sub-cable of torque, the especially first order, can guarantee the mechanical stability of cable like this; Make and better contact between the strand in the hyperconductive cable had good self-supporting; In the end in the sub-cable of one-level, adopt short torque, can reduce the A.C.power loss of superconducting conductor; In the stranded cable process, all sub-cable direction of lays are right, and are consistent with the direction of lay of superconduction strand inner filaments.The torque of noting cable simultaneously can not be the integral multiple of its sub-cable torque, can avoid the couple current loss that causes because of geometric resonance like this.
Hyperconductive cable all adopts the stranded mode of the sub-cable of level Four, the triangle cable that the sub-cable choice structure of the first order is more stable.Can use pure copper wire to twist system in the cable with superconducting line; Superconduction strand and pure copper wire are through selecting the different combinations mode; Satisfy the long-pending requirement of copper face of the superconduction area and the magnet quenching after heat protection needs of magnet needs current-carrying; Simultaneously, guarantee that on the stranded cable mode separating copper cash is symmetrically distributed, and avoids CURRENT DISTRIBUTION inhomogeneous in cable.As: adopt two kinds of different one-level cables, be respectively 2 superconducting lines+1 copper cash and 3 superconducting lines, the secondary cable adopts two first kind of one-level cables and two second kind of one-level cable strand systems to form.So both guaranteed the superconduction of conductor needs and the area of copper, practiced thrift the usage quantity of superconducting line again, made that the design of hyperconductive cable was more flexible and practical.
The outermost layer of hyperconductive cable adopts the thick 316L stainless steel band of 0.05mm to carry out 50% stacked package; Can guarantee that hyperconductive cable keeps overall dimension under tension-free situation; In the process of cable transportation, prevent the pollution of dust and impurity to hyperconductive cable; Can also in the process of pipe inner cable conductor poling, play the certain protection effect simultaneously, prevent the friction between superconduction strand surface and the stainless steel armor hyperconductive cable.
Beneficial effect of the present invention:
(1) the present invention can better contact between the strand in the hyperconductive cable, thereby obtain good self-supporting through the torque of what sub-cable before increasing in the hyperconductive cable; Through reducing the torque of hyperconductive cable afterbody, reduced the A.C.power loss of superconducting conductor simultaneously.
(2) the present invention mixes the mode of taking through adopting niobium three tin superconduction strands and copper cash; Both satisfied the superconducting conductor requirement long-pending to copper face; Guaranteed that also the superconduction strand in the inner even distribution of conductor, has also reduced the consumption of superconduction strand simultaneously, practiced thrift production cost.This method for designing makes the design of hyperconductive cable more flexible and practical.
(3) the present invention utilizes the hyperconductive cable of this method winding method making to be processed into pipe inner cable conductor; Can reduce even eliminate because the performance degradation problem that the electromagnetism circulation causes; Produce can operation steady in a long-term large-scale superconducting magnet, this hyperconductive cable has been successfully applied in the middle of the testing coil of the outer superconducting magnet of 40T hybrid magnet.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment:
Embodiment 1:The winding method of the niobium three tin hyperconductive cables of large-scale superconducting magnet may further comprise the steps:
(1) according to the condition of work of superconducting conductor, calculate the number of required superconduction strand and copper cash, and the composition mode of configuration hyperconductive cable, guarantee that superconduction strand and copper cash are in the inner evenly distribution of hyperconductive cable;
(2) first order stranded cable is processed the one-level cable by three superconduction strands or superconducting line and copper cash combination strand, crosses mould and steady footpath, and torque is chosen as the one-level cable and crosses 33 times of diameter behind the mould;
(3) second level stranded cable is processed the secondary cable by three to four one-level cables strand, can adopt identical one-level cable, also can adopt the one-level cable of different component to mix to take and form, and crosses mould and steady footpath, and torque is chosen as the secondary cable and crosses 30 times of diameter behind the mould;
(4) third level stranded cable is processed three grades of cables by the sub-cables strand of three to four secondarys, crosses mould and steady footpath, and torque is chosen as the secondary cable and crosses 21 times of diameter behind the mould;
(5) fourth stage stranded cable is processed the level Four cable by three to five three grades sub-cables strands, crosses mould and undergauge, and the voidage of cable is controlled at 40%, and torque is chosen as 15 times of diameter behind the level Four cable undergauge;
(6) level Four cable surface adopts the thick stainless steel band of 0.05mm to carry out 50% stacked package, is made into niobium three tin hyperconductive cables.
Embodiment 2:As shown in Figure 1; The winding method of the niobium three tin hyperconductive cables of large-scale superconducting magnet; May further comprise the steps: hyperconductive cable adopts the stranded mode coiling of level Four cable to form; Mode by copper cash 1 and superconducting line 2 combinations is twisted into first kind of one-level cable 3, is twisted into second kind of one-level cable 4 by three superconducting lines 2; Mix the mode of taking by four two kinds different one-level cables and be twisted into secondary cable 5; Be twisted into three grades of cables 6 by four secondary cables 5 again; Be twisted into level Four cable 7 by five three grades of cables 6, cross mould and undergauge, and adopt the thick 316L stainless steel band of 0.05mm to carry out 50% stacked package, be made into niobium three tin hyperconductive cables on its surface.
Claims (1)
1. the winding method of the niobium three tin hyperconductive cables of a large-scale superconducting magnet is characterized in that may further comprise the steps:
(1), calculates the number of required superconduction strand and copper cash according to the condition of work of superconducting conductor;
(2) first order stranded cable is processed the one-level cable by three superconduction strands or superconducting line and copper cash combination strand, crosses mould and steady footpath, and torque is chosen as 32-34 that the one-level cable crosses diameter behind the mould doubly;
(3) second level stranded cable is processed the secondary cable by three to four one-level cables strand, can adopt identical one-level cable, also can adopt the one-level cable of different component to mix to take and form, and crosses mould and steady footpath, and torque is chosen as 28-32 that the secondary cable crosses diameter behind the mould doubly;
(4) third level stranded cable is processed three grades of cables by the sub-cables strand of three to four secondarys, crosses mould and steady footpath, and torque is chosen as 20-22 that the secondary cable crosses diameter behind the mould doubly;
(5) fourth stage stranded cable is processed the level Four cable by three to five three grades sub-cables strands, crosses mould and undergauge, and the voidage of cable is controlled at 38-42%, and the 14-16 that torque is chosen as diameter behind the level Four cable undergauge doubly;
(6) level Four cable surface adopts the thick stainless steel band of 0.05mm to carry out the 40-50% stacked package, is made into niobium three tin hyperconductive cables.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105989930A (en) * | 2016-01-28 | 2016-10-05 | 中国科学院等离子体物理研究所 | Manufacturing method for cable of high temperature superconducting material |
| CN112466554A (en) * | 2020-11-17 | 2021-03-09 | 中国科学院合肥物质科学研究院 | Low-temperature superconducting cable treatment process for high-current high-temperature superconducting current lead |
| CN112820470A (en) * | 2021-01-05 | 2021-05-18 | 中国科学院合肥物质科学研究院 | MgB2CICC conductor structure and manufacturing method thereof |
| CN114783682A (en) * | 2022-06-17 | 2022-07-22 | 西部超导材料科技股份有限公司 | Preparation method of low-temperature direct-current twisted pair for quantum computer |
| CN116759154A (en) * | 2023-08-16 | 2023-09-15 | 西安聚能超导线材科技有限公司 | Preparation method of superconducting wire with short production period and ultra-low copper ratio |
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| CN112466554A (en) * | 2020-11-17 | 2021-03-09 | 中国科学院合肥物质科学研究院 | Low-temperature superconducting cable treatment process for high-current high-temperature superconducting current lead |
| CN112466554B (en) * | 2020-11-17 | 2022-05-31 | 中国科学院合肥物质科学研究院 | Low-temperature superconducting cable treatment process for high-current high-temperature superconducting current lead |
| CN112820470A (en) * | 2021-01-05 | 2021-05-18 | 中国科学院合肥物质科学研究院 | MgB2CICC conductor structure and manufacturing method thereof |
| CN114783682A (en) * | 2022-06-17 | 2022-07-22 | 西部超导材料科技股份有限公司 | Preparation method of low-temperature direct-current twisted pair for quantum computer |
| CN114783682B (en) * | 2022-06-17 | 2022-09-09 | 西部超导材料科技股份有限公司 | Preparation method of low-temperature direct-current twisted pair for quantum computer |
| CN116759154A (en) * | 2023-08-16 | 2023-09-15 | 西安聚能超导线材科技有限公司 | Preparation method of superconducting wire with short production period and ultra-low copper ratio |
| CN116759154B (en) * | 2023-08-16 | 2023-11-17 | 西安聚能超导线材科技有限公司 | Preparation method of superconducting wire with short production period and ultra-low copper ratio |
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