CN111751579A - Design method of large current-carrying critical current sample rod - Google Patents
Design method of large current-carrying critical current sample rod Download PDFInfo
- Publication number
- CN111751579A CN111751579A CN202010434084.5A CN202010434084A CN111751579A CN 111751579 A CN111751579 A CN 111751579A CN 202010434084 A CN202010434084 A CN 202010434084A CN 111751579 A CN111751579 A CN 111751579A
- Authority
- CN
- China
- Prior art keywords
- rod
- copper rod
- copper
- low
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000013461 design Methods 0.000 title claims abstract description 27
- 239000010949 copper Substances 0.000 claims abstract description 197
- 229910052802 copper Inorganic materials 0.000 claims abstract description 160
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 156
- 239000002131 composite material Substances 0.000 claims abstract description 43
- 238000004364 calculation method Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 229910000657 niobium-tin Inorganic materials 0.000 claims description 19
- 229910000679 solder Inorganic materials 0.000 claims description 9
- 238000005476 soldering Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 6
- 229910007637 SnAg Inorganic materials 0.000 claims description 4
- 238000010791 quenching Methods 0.000 claims description 4
- 229910007116 SnPb Inorganic materials 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims 1
- 239000002887 superconductor Substances 0.000 abstract description 15
- 238000005259 measurement Methods 0.000 abstract description 14
- 239000001307 helium Substances 0.000 description 13
- 229910052734 helium Inorganic materials 0.000 description 13
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 13
- 239000007788 liquid Substances 0.000 description 9
- 238000005219 brazing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000002595 magnetic resonance imaging Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241000784732 Lycaena phlaeas Species 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
Abstract
The invention discloses a design method of a large current-carrying critical current sample rod, which specifically comprises the following steps: step 1, calculating the consumption of the superconducting wire and the cross-sectional area of a copper rod at a low-temperature end; step 2, manufacturing a low-temperature end superconducting composite current lead according to the calculation result of the step 1; step 3, calculating the cross sectional area of the connecting rod at the normal temperature end; step 4, manufacturing a connecting rod connected with the normal temperature end according to the calculation result of the step 3; and 5, assembling the composite current lead manufactured in the step 2 and the connecting rod manufactured in the step 4. The current sample rod designed by the invention can carry current to 2500A at most and can finish the measurement of a high critical current superconductor.
Description
Technical Field
The invention belongs to the technical field of performance measurement of superconducting materials, and relates to a design method of a large-current-carrying critical current sample rod.
Background
NbTi/Cu low-temperature composite superconductors are one of the most widely applied low-temperature superconductors at present. The high-intensity magnetic field magnet and the magnetic confinement nuclear fusion device (Tokamak) for scientific research have wide application in the aspects of Magnetic Resonance Imaging (MRI) and the like. The NbTi/Cu low-temperature composite superconductor is structurally divided into an integrated superconductor (monolithic structure) and a superconductor (Wire In Channel, hereinafter referred to as WIC Wire) which is made by embedding the integrated superconductor In a copper slot Wire.
Critical current (I)c) Refers to the maximum current that a superconductor does not pass at a particular temperature (typically about 4.2K at liquid helium temperature for cryogenic superconductors) and a particular background magnetic field. The monolithic structure wire of the NbTi/Cu low-temperature composite superconductor is widely applied to various strong magnetic field devices such as various magnets for general scientific research, magnetic confinement nuclear fusion devices and the like, the wire diameter of the monolithic structure wire is small, the diameter of the monolithic structure wire is usually less than 1mm, and the critical current of a single strand is generally below 800A (when the background magnetic field is 4T); the WIC wire has a cross section close to a rectangle and a large cross section, and the current carrying capacity can reach about 2000A (4T of a background magnetic field), so that the WIC wire is generally used in a medical nuclear magnetic resonance imager.
With the development of MRI technology, more and more hospitals are equipped with MRI equipment, so the demand of WIC wires is gradually increased, and the initial critical current sample rod uses red copper as a raw material, and is suitable for the measurement of critical current with the current carrying capacity of 1000A or less. When the current larger than 1000A is measured, the liquid helium consumption is greatly increased, the cost is increased suddenly, and the measured microvolt voltage signal is influenced by a large amount of helium generated by boiling liquid helium, becomes extremely unstable and often causes measurement failure.
Disclosure of Invention
The invention aims to provide a design method of a large current-carrying critical current sample rod, the current sample rod designed by the method can carry current to 2500A at maximum, and measurement of a high critical current superconductor can be completed.
The invention adopts the technical scheme that a design method of a large current-carrying critical current sample rod specifically comprises the following steps:
and 5, assembling the composite current lead manufactured in the step 2 and the connecting rod manufactured in the step 4.
The present invention is also characterized in that,
the calculation process of the superconducting wire dosage in the step 1 is as follows:
NbTi/Cu and Nb with known current carrying capacity3The number of the Sn/Cu low-temperature composite superconducting wires is n1And n2Setting a safety coefficient gamma in consideration of the quench risk of the wire;
the number n of the NbTi/Cu low-temperature composite superconducting wiresNbTiComprises the following steps:
nNbTi＝n1/γ；
Nb3actual required number n of Sn/Cu low-temperature composite superconducting wiresNb3SnComprises the following steps:
nNb3Sn＝n2/γ；
minimum cross-sectional area S of copper rod at low temperature end1The calculation formula is as follows:
S1＝I1/j1
wherein, I1Current carrying expected by the low temperature end copper rod;
j1and the current carrying capacity of the copper rod at the low-temperature end per unit area.
the copper rod III is vertically arranged and is parallel to the copper rod II, the bottom of the copper rod III is connected to the supporting block, and the copper rod III is located at one end of the supporting block; an insulating plate is arranged between the supporting block and the horizontal transverse plate;
a jack II is arranged at the center of the supporting block, a jack III is arranged at the center of the insulating plate, and a jack IV is arranged at one end of the insulating plate; the copper rod I sequentially penetrates through the jack III, the jack II and the insulation board from the jack IV to combine the copper rod I, the copper rod II and the copper rod III.
The specific process of the step 2 is as follows:
grooves are formed in the side walls of the copper rod II and the copper rod III, and n is arranged at the positions, where the grooves are formed, of the copper rod II and the copper rod III respectivelyNbTiNbTi/Cu low-temperature composite superconducting wire and nNb3SnRoot of Nb3Sn/Cu low-temperature composite superconducting wire;
a through hole is arranged at the center of the copper rod I, and n is connectedNbTiNbTi/Cu low-temperature composite superconducting wire and nNb3SnRoot of Nb3The Sn/Cu low-temperature composite superconducting wire is arranged in the through hole;
the cross sectional areas of the copper rod I, the copper rod II and the copper rod III are respectively more than or equal to S1。
And in the step 2, the copper rod I, the copper rod II and the copper rod III are compounded by adopting a low-temperature soldering method.
And 2, selecting one of SnAg solder or SnPb solder during welding in the step 2.
Cross-sectional area S of normal temperature connecting rod in step 32The calculation formula is as follows:
S2＝I2/j2
wherein, I2-current carrying expected to be achieved by the normal temperature connecting rod;
j2current carrying capacity per unit area of the normal temperature connecting rod.
The normal temperature connecting rods in the step 4 comprise two normal temperature connecting rods, each normal temperature connecting rod comprises an outer copper pipe and an inner copper pipe which are coaxially sleeved, and the outer copper pipeCross sectional area S2；
Exhaust holes are respectively arranged at the upper end and the lower end of the outer copper pipe and the inner copper pipe at the same time; and the exhaust hole is arranged on the side wall of one side of the outer copper pipe and the inner copper pipe.
The specific process of the step 5 is as follows: and respectively welding two normal-temperature connecting rods at the upper ends of the copper rod II and the copper rod III.
The sample rod designed by the design method of the high-current-carrying critical current sample rod has the advantages that the loss of a large amount of liquid helium caused by heating of the copper lead when the current carrying is increased is reduced, the measurement cost is reduced, and the measurement precision is improved. The sample rod manufactured by the invention has stable background voltage in a superconducting state, can be conveniently deducted, calculates critical electricity according to the criterion of a detection standard and has high precision.
Drawings
FIG. 1 is a schematic structural diagram of a sample rod designed by the method for designing a sample rod with a large current-carrying critical current according to the present invention;
FIG. 2 is a schematic diagram of a split structure of a low-temperature copper rod in a sample rod designed by the method for designing a high current-carrying critical current sample rod;
FIG. 3 is a schematic view of an assembly structure of a low-temperature copper rod in a sample rod designed by the method for designing a high-current-carrying critical current sample rod according to the present invention;
FIG. 4 is a top view of a sample rod with a copper rod II and a superconducting wire being combined according to the method for designing a sample rod with a high current-carrying critical current;
FIG. 5 is a top view of a sample rod I and a superconducting wire of the sample rod designed by the method for designing a high current-carrying critical current sample rod according to the present invention;
FIG. 6 is a schematic structural diagram of a normal temperature rod of a sample rod designed by the method for designing a large current-carrying critical current sample rod according to the present invention;
FIGS. 7(a), (b) are graphs of measurements on different sample rods;
FIG. 8 is a measured graph of WIC;
FIG. 9 is Nb3Sn/Cu composite superconductor measurement graph.
In the figure, 1, a superconducting wire, 2, a copper rod I, 3, a copper rod II, 4, a copper rod III, 5, a horizontal transverse plate, 7, jacks I, 9, supporting blocks, 10, an insulating plate, 11, jacks II, 12, jacks III, 13, jacks IV, 14, a connecting rod, 15, a sample and 16 exhaust holes.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a design method of a large current-carrying critical current sample rod, which specifically comprises the following steps:
NbTi/Cu and Nb with known current carrying capacity3The number of the Sn/Cu low-temperature composite superconducting wires is n1And n2Setting a safety coefficient gamma in consideration of the quench risk of the wire;
the number n of the NbTi/Cu low-temperature composite superconducting wiresNbTiComprises the following steps:
nNbTi＝n1/γ；
Nb3actual required number n of Sn/Cu low-temperature composite superconducting wiresNb3SnComprises the following steps:
nNb3Sn＝n2/γ；
cross-sectional area S of low temperature end copper rod1The calculation formula is as follows:
S1＝I1/j1
wherein, I1Current carrying expected by the low temperature end copper rod;
j1and the current carrying capacity of the copper rod at the low-temperature end per unit area.
At low temperature, the current carrying of the copper rod can reach 10A/mm2～15A/mm2The medium-low temperature end of the liquid helium adopts 15A/mm2The cross-sectional area of the required copper rod is calculated.
Only NbTi/Cu and Nb are calculated under high and low fields respectively3The reasons for the number of Sn/Cu low-temperature composite superconducting wires are as follows: 5T and Nb below3The Sn/Cu composite superconducting wire has the phenomenon of unstable magnetic flux under low field, and the NbTi/Cu composite superconducting wire is more than 8TThe wire has lost its current-carrying capacity and only relies on Nb3Sn/Cu composite superconducting wire.
Referring to fig. 1-3, the low-temperature end copper rod comprises a copper rod I2, a copper rod II3 and a copper rod III4, a horizontal transverse plate 5 is arranged at the upper end of the copper rod I2, the copper rod I2 is located at the center of the horizontal transverse plate 5, the copper rod II3 is arranged on the upper side of one end of the horizontal transverse plate 5 in the vertical direction, and an insertion hole I7 is formed at the other end of the horizontal transverse plate 5;
the device also comprises a vertically arranged copper rod III4, wherein the copper rod III4 and the copper rod II3 are arranged in parallel, the bottom of the copper rod III4 is connected to the supporting block 9, and the copper rod III4 is positioned at one end of the supporting block 9; an insulating plate 10 is arranged between the supporting block 9 and the horizontal transverse plate 5; the insulating plate 10 is a low temperature resistant insulating plate, and polytetrafluoroethylene can be selected.
A jack II11 is arranged at the center of the supporting block 9, a jack III12 is arranged at the center of the insulating plate 10, and a jack IV13 is arranged at one end of the insulating plate 10; copper rod I2 passes through jack III12 and jack II11 in sequence, and copper rod III4 passes through insulating plate 10 from jack IV13 to combine copper rod I2, copper rod II3 and copper rod III4 together.
The horizontal transverse plate 5, the supporting block 9, the copper rod I2, the copper rod II3 and the copper rod III4 are all made of red copper materials.
Grooves are arranged on the side walls of the copper rod II3 and the copper rod III4, and n is arranged at the position where the grooves are arranged on the copper rod II3 and the copper rod III4 respectivelyNbTiNbTi/Cu low-temperature composite superconducting wire and nNb3SnRoot of Nb3Sn/Cu low-temperature composite superconducting wire; NbTi/Cu low-temperature composite superconducting wire and nNb3SnRoot of Nb3The Sn/Cu low-temperature composite superconducting wire is collectively called a superconducting wire.
Referring to fig. 4, a schematic diagram of a structure of mounting a superconducting wire on a copper rod II3 is shown; the structure of mounting superconducting wire 1 on copper rod III4 is the same as in fig. 4.
Referring to FIG. 5, a through hole is opened at the center of the copper rod I2, and n isNbTiNbTi/Cu low-temperature composite superconducting wire and nNb3SnRoot of Nb3A superconducting wire 1 composed of Sn/Cu low-temperature composite superconducting wires is arranged in the through hole;
the cross-sectional areas of the copper rod I2, the copper rod II3 and the copper rod III4 are all S1.
The copper rod I2, the copper rod II3 and the copper rod III4 are all compounded by adopting a low-temperature soldering method.
The solder is one of SnAg solder or SnPb solder during soldering.
cross-sectional area S of normal temperature connecting rod in step 32The calculation formula is as follows:
S2＝I2/j2
wherein, I2-current carrying expected to be achieved by the normal temperature connecting rod;
j2current carrying capacity per unit area of normal temperature connecting rod, here 10A/mm2And (4) calculating.
in step 4, the normal temperature connecting rods 14 comprise two normal temperature connecting rods, each normal temperature connecting rod comprises an outer copper pipe and an inner copper pipe which are coaxially sleeved, and the cross-sectional area of each outer copper pipe is S2(ii) a Exhaust holes 16 are respectively arranged at the upper end and the lower end of the outer copper pipe and the inner copper pipe at the same time; and the exhaust hole 16 is arranged on one side wall of the outer copper pipe and one side wall of the inner copper pipe.
The distribution positions of the exhaust holes 16 on the connecting rod 14 are shown in fig. 6, the aperture of each exhaust hole 16 is 1-3 mm, and the number of the exhaust holes at the upper end and the lower end of each outer copper pipe and each inner copper pipe is 3-5;
the connecting rod 14 is made of red copper materials, in order to increase the cooling area, the design of a double-layer copper pipe is adopted, a layer of thin-wall through pipe with proper thickness is sleeved outside the inner copper pipe, and the area of the designed copper pipe needs to meet the requirement of a theoretical calculation part. The both ends all open the gas pocket (aperture 1mm ~ 3mm, 3 ~ 5 of quantity are suitable) under the top of connecting rod 14, guarantee that cold helium can pass through from each surface of connecting rod smoothly to and the heat that produces when the time takes away heavy current and passes through.
And 5, assembling the composite current lead manufactured in the step 2 and the connecting rod manufactured in the step 4.
The specific process of the step 5 is as follows: two normal temperature connecting rods 14 are respectively welded at the upper ends of the copper rod II3 and the copper rod III 4.
All low temperature joints require argon arc welding and brazing with a brazing wire (hereinafter "brazing"). The brazing and soldering sequence is reasonably arranged, for example, when brazing is carried out after the completion of soldering, attention must be paid to fully cooling a soldered part in the process so as to prevent desoldering.
The design principle of the design method of the large current-carrying critical current sample rod is as follows: firstly, the design principle of a low temperature end is as follows: the low temperature end here refers to the portion of the sample rod immersed in liquid helium. By utilizing the characteristic that the superconducting wire can carry current without resistance at low temperature, the low-temperature superconducting wire NbTi/Cu (generally applied in the range of the magnetic field not exceeding 8T) and Nb are carried3Sn/Cu (generally applied in the range of magnetic field not exceeding 12T) is combined with pure copper to design a measuring rod capable of carrying over 2000A of current in the range of field intensity from zero field to 12T.
Connecting rod design principle: the liquid helium non-soaked sample rod reaches the end part of the room temperature. The part still adopts red copper as the material, but in order to fully utilize the latent heat of cold helium gas to reduce the heat generation of the sample rod, the sample rod is changed into a multi-layer sleeve structure so as to increase the cooling area, and the upper end and the lower end are respectively provided with an air hole to ensure the smoothness of a cold helium gas path.
The design method of the large current-carrying critical current sample rod is successfully used for manufacturing the sample rod for measuring the critical current of the WIC wire, and comprises the following specific operations:
1. calculating the amount of superconducting wire and the cross-sectional area of copper lead
The sample rod is designed to be 2500A, depending on the design current of the WIC superconducting wire. The NbTi/Cu superconducting wire used, which has a diameter of about 0.7mm, is about 400A under a 5T background field. And calculating the safety coefficient gamma to be 0.7 according to a formula to obtain 9 roots. And Nb with a diameter of about 0.8mm is used3The Sn/Cu superconducting wire is about 300A under a 12T background field. And calculating the safety coefficient gamma to be 0.7 according to a formula to obtain 10 roots.
The area of the copper lead part is calculated to be more than 450mm2。
2. Low-temperature end composite current lead manufacturing method
In liquid helium, the sample rod is prevented from being damaged by accidental quench of the superconducting wire, and the cross section of the copper rod at the low-temperature end is calculated to be more than 167mm2The requirement can be met by using a copper rod with the diameter of 15 mm.
According to the designed assembly sequence, part of the parts are brazed first. Embedding the superconducting wire into grooves in the copper rod II3 and the copper rod III4 in a mode of soldering the superconducting wire; the solder is SnAg alloy which is more suitable for low-temperature superconducting measurement. Superconducting wire was then fed into the through hole in the center of the copper rod I2.
3. Current lead manufacturing of connecting rod
Calculated, the sectional area of the connecting rod is more than 250mm2. A copper tube of 12mm external diameter and 6mm internal diameter was used and a thin walled copper tube of 16mm external diameter and 14mm internal diameter was fitted over the outside and each current pole (positive or negative) required a 2-way sleeve of copper tube of the same design, thus requiring a total of 4. Both ends are perforated separately.
4. Assembly
And (4) assembling and welding all the parts to complete the manufacture of the sample rod.
Proof of effectiveness
The sample rod manufactured by the design method of the large current-carrying critical current sample rod is used for measuring the critical current of the sample from the maximum current to about 2500A, and thousands of samples are measured so far. Fig. 7(a) is a graph of measurement using a common copper sample rod. Along with the increase of the current, the sample is influenced by the heating of the sample rod, the back bottom voltage fluctuates greatly when the sample is in a superconducting state, the critical current is difficult to calculate according to the criterion of the detection standard, the experiment fails, and the rod cannot measure the critical current under the current carrying. The sample rod (see fig. 7(b)) manufactured by the method has stable background voltage in a superconducting state, can be conveniently deducted, calculates critical power according to the criterion of a detection standard, and has high precision.
Example 1
2T back field, measuring WIC superconductor with critical current about 2200A;
FIG. 8 is a graph showing a cross-sectional area of about 3mm2Left and right WIC superconductorThe critical current I is measured according to the criterion that the electric field E is 0.1 MuV/cmC＝2061A。
Example 2
Measurement of Nb in 12T back field3Critical current of Sn/Cu composite superconductor
FIG. 9 is Nb3The measurement curve of the Sn/Cu composite superconductor is about 1.3mm2. Under high field, the curve is also smooth, and the critical current I is measured according to the criterion that E is 0.1 MuV/cmC1315A. There is currently no measurement requirement to a critical current of 2000A.
Claims (9)
1. A design method of a large current-carrying critical current sample rod is characterized by comprising the following steps: the method specifically comprises the following steps:
step 1, calculating the consumption of the superconducting wire and the cross-sectional area of a copper rod at a low-temperature end;
step 2, manufacturing a low-temperature end superconducting composite current lead according to the calculation result of the step 1;
step 3, calculating the cross sectional area of the connecting rod at the normal temperature end;
step 4, manufacturing a connecting rod connected with the normal temperature end according to the calculation result of the step 3;
and 5, assembling the composite current lead manufactured in the step 2 and the connecting rod manufactured in the step 4.
2. The design method of a large current-carrying critical current sample rod as claimed in claim 1, wherein: the calculation process of the superconducting wire usage in the step 1 is as follows:
NbTi/Cu and Nb with known current carrying capacity3The number of the Sn/Cu low-temperature composite superconducting wires is n1And n2Setting a safety coefficient gamma in consideration of the quench risk of the wire;
the number n of the NbTi/Cu low-temperature composite superconducting wiresNbTiComprises the following steps:
nNbTi＝n1/γ；
Nb3actual required number n of Sn/Cu low-temperature composite superconducting wiresNb3SnComprises the following steps:
nNb3Sn＝n2/γ；
the cross-sectional area S of the low-temperature end copper rod1The calculation formula is as follows:
S1＝I1/j1
wherein, I1Current carrying expected by the low temperature end copper rod;
j1and the current carrying capacity of the copper rod at the low-temperature end per unit area.
3. The design method of a large current-carrying critical current sample rod as claimed in claim 2, wherein: the copper rod at the low-temperature end in the step 1 comprises a copper rod I, a copper rod II and a copper rod III, a horizontal transverse plate is arranged at the upper end of the copper rod I, the copper rod I is positioned in the center of the horizontal transverse plate, the copper rod II is arranged on the upper side of one end of the horizontal transverse plate in the vertical direction, and an insertion hole I is formed in the other end of the horizontal transverse plate;
the copper rod III is vertically arranged and is parallel to the copper rod II, the bottom of the copper rod III is connected to the supporting block, and the copper rod III is located at one end of the supporting block; an insulating plate is arranged between the supporting block and the horizontal transverse plate;
a jack II is arranged at the center of the supporting block, a jack III is arranged at the center of the insulating plate, and a jack IV is arranged at one end of the insulating plate; the copper rod I sequentially penetrates through the jack III, the jack II and the insulation board from the jack IV to combine the copper rod I, the copper rod II and the copper rod III.
4. The design method of a large current-carrying critical current sample rod as claimed in claim 2, wherein: the specific process of the step 2 is as follows:
grooves are formed in the side walls of the copper rod II and the copper rod III, and n is arranged at the positions, where the grooves are formed, of the copper rod II and the copper rod III respectivelyNbTiNbTi/Cu low-temperature composite superconducting wire and nNb3SnRoot of Nb3Sn/Cu low-temperature composite superconducting wire;
a through hole is arranged at the center of the copper rod I, and n is connectedNbTiNbTi/Cu low-temperature composite superconducting wire and nNb3SnRoot of Nb3Sn/Cu low-temperature composite superconducting wire is arranged in the leadIn the hole;
the cross-sectional areas of the copper rod I, the copper rod II and the copper rod III are S1.
5. The design method of a large current-carrying critical current sample rod as claimed in claim 3, wherein: and in the step 2, the copper rod I, the copper rod II and the copper rod III are compounded by adopting a low-temperature tin soldering method.
6. The design method of a large current-carrying critical current sample rod as claimed in claim 4, wherein: and during welding in the step 2, the solder is selected from one of SnAg solder or SnPb solder.
7. The design method of a large current-carrying critical current sample rod as claimed in claim 3, wherein: the cross sectional area S of the normal temperature connecting rod in the step 32The calculation formula is as follows:
S2＝I2/j2
wherein, I2-current carrying expected to be achieved by the normal temperature connecting rod;
j2current carrying capacity per unit area of the normal temperature connecting rod.
8. The design method of a large current-carrying critical current sample rod as claimed in claim 6, wherein: the normal temperature connecting rods in the step 4 comprise two normal temperature connecting rods, each normal temperature connecting rod comprises an outer copper pipe and an inner copper pipe which are coaxially sleeved, and the cross sectional area of each outer copper pipe is S2；
Exhaust holes are respectively arranged at the upper end and the lower end of the outer copper pipe and the inner copper pipe at the same time; and the exhaust hole is arranged on the side wall of one side of the outer copper pipe and the inner copper pipe.
9. The design method of a large current-carrying critical current sample rod as claimed in claim 7, wherein: the specific process of the step 5 is as follows: and respectively welding two normal-temperature connecting rods at the upper ends of the copper rod II and the copper rod III.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010434084.5A CN111751579A (en) | 2020-05-21 | 2020-05-21 | Design method of large current-carrying critical current sample rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010434084.5A CN111751579A (en) | 2020-05-21 | 2020-05-21 | Design method of large current-carrying critical current sample rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111751579A true CN111751579A (en) | 2020-10-09 |
Family
ID=72673420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010434084.5A Pending CN111751579A (en) | 2020-05-21 | 2020-05-21 | Design method of large current-carrying critical current sample rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111751579A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110873852A (en) * | 2018-08-30 | 2020-03-10 | 西部超导材料科技股份有限公司 | Preparation method of sample for WIC (wire in wire) inlaid critical current measurement |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06333728A (en) * | 1993-05-27 | 1994-12-02 | Mitsubishi Electric Corp | Bi-base oxide superconductor for current lead and manufacture thereof |
| EP0698930A1 (en) * | 1994-08-26 | 1996-02-28 | Hitachi, Ltd. | Oxide superconductor and fabrication method of the same |
| CN2689404Y (en) * | 2004-04-09 | 2005-03-30 | 贾林祥 | Current leading wires |
| CN101694908A (en) * | 2009-09-30 | 2010-04-14 | 中国科学院等离子体物理研究所 | Low temperature superconducting assembly with low joint resistance for high temperature superconducting current lead cold end |
| CN106443270A (en) * | 2016-10-25 | 2017-02-22 | 云南电网有限责任公司电力科学研究院 | A high-temperature superconducting tape current carrying capability test apparatus and an application method thereof |
| CN106872733A (en) * | 2017-01-16 | 2017-06-20 | 中国科学院合肥物质科学研究院 | 2kA superconductive strand critical current test sample holders |
-
2020
- 2020-05-21 CN CN202010434084.5A patent/CN111751579A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06333728A (en) * | 1993-05-27 | 1994-12-02 | Mitsubishi Electric Corp | Bi-base oxide superconductor for current lead and manufacture thereof |
| EP0698930A1 (en) * | 1994-08-26 | 1996-02-28 | Hitachi, Ltd. | Oxide superconductor and fabrication method of the same |
| CN2689404Y (en) * | 2004-04-09 | 2005-03-30 | 贾林祥 | Current leading wires |
| CN101694908A (en) * | 2009-09-30 | 2010-04-14 | 中国科学院等离子体物理研究所 | Low temperature superconducting assembly with low joint resistance for high temperature superconducting current lead cold end |
| CN106443270A (en) * | 2016-10-25 | 2017-02-22 | 云南电网有限责任公司电力科学研究院 | A high-temperature superconducting tape current carrying capability test apparatus and an application method thereof |
| CN106872733A (en) * | 2017-01-16 | 2017-06-20 | 中国科学院合肥物质科学研究院 | 2kA superconductive strand critical current test sample holders |
Non-Patent Citations (2)
| Title |
|---|
| 付家才 等: "《电机试验与实践》", 30 April 2007, 高等教育出版社 * |
| 马权 等: "NbTi超导线材的研究与发展", 《材料导报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110873852A (en) * | 2018-08-30 | 2020-03-10 | 西部超导材料科技股份有限公司 | Preparation method of sample for WIC (wire in wire) inlaid critical current measurement |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7684839B2 (en) | Connecting structure for magnesium diboride superconducting wire and a method of connecting the same | |
| US8229528B2 (en) | Superconducting coil having a granular superconducting junction | |
| US20120021915A1 (en) | Superconducting joint and method for manufacturing same | |
| EP2095377B1 (en) | Superconducting wire and manufacturing method thereof | |
| US5298679A (en) | Current lead for cryostat using composite high temperature superconductors | |
| Kovalev et al. | Test results of 12/18 kA ReBCO coated conductor current leads | |
| CN111751579A (en) | Design method of large current-carrying critical current sample rod | |
| Chang et al. | An experimental study on the joint methods between double pancake coils using YBCO coated conductors | |
| WO2003103094A1 (en) | Current lead for superconducting apparatus | |
| CN103367937B (en) | Manufacturing method of NbTi superconductor split conductor joint | |
| Ballarino et al. | 13000 A HTS current leads for the LHC accelerator: From conceptual design to prototype validation | |
| Fukuzaki et al. | Development of a superconducting joint for high field NMR | |
| Hudson et al. | The critical current density of filamentary Nb 3 Sn as a function of temperature and magnetic field | |
| CN110895986B (en) | Low-resistance niobium three-tin superconducting wire joint and manufacturing method thereof | |
| Yasukochi | Large coil task of IEA in the development of superconducting magnets for fusion | |
| Amemiya et al. | Stability analysis of multi-strand superconducting cables | |
| Bairagi et al. | Test Results of a Prototype HTS Current Lead With MgB 2 and NbTi Superconducting Joints | |
| Heller et al. | Conceptual design of a 20-kA current lead using forced-flow cooling and Ag-alloy-sheathed Bi-2223 high-temperature superconductors | |
| Wen et al. | Manufacture and behaviors of superconducting busbar joint for ITER correction coil feeder | |
| US20230282400A1 (en) | Magnet structures comprising a high temperature superconductor (hts) cable in groove | |
| Qian et al. | Conceptual design of hybrid IBS-REBCO magnet and a study on joint technology for high-field application | |
| JPH08107010A (en) | Current lead for superconductive device | |
| JP2013145772A (en) | Superconductive current lead jig, superconductive current lead and manufacturing method of superconductive current lead | |
| RU71033U1 (en) | HIGH-TEMPERATURE SUPERCONDUCTING MATERIAL | |
| Scheller et al. | Development of a 600 A HTS current lead using modular design |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201009 |