JP4738755B2 - Superconducting conductor connection device - Google Patents

Description

  The present invention relates to a superconducting conductor connection device for connecting superconducting conductors such as superconducting CIC (Cable In Conduit) conductors to each other.

In the superconducting CIC conductor, the outer periphery of the superconducting stranded wire is covered with stainless steel, incoloy, or the like, and the following Non-Patent Document 1 discloses a superconducting conductor connecting device that electrically connects two superconducting CIC conductors. Has been.
That is, when two superconducting CIC conductors are electrically connected, the outer periphery covering at the end of the superconducting CIC conductor is removed, and a copper tube is covered instead of the outer periphery covering.
Then, a copper block is inserted between the copper tubes of the two superconducting CIC conductors arranged in parallel, and each copper tube and the copper block are joined by solder or the like.

H. Tsuji et. al, Fusion Engineering and Design 55 (2001), ITERR & D: Magnets: Conductor and Joint Development.

Since the conventional superconducting conductor connecting device is configured as described above, when a varying external magnetic field acts on the superconducting CIC conductor, eddy currents are generated in the copper block and the copper tube. When an eddy current is generated in the copper block and the copper tube, Joule heat (coupling loss, AC loss) is generated at the connection point between the copper block and the superconducting CIC conductor. When the rate of change of the external magnetic field is large, heat generation due to eddy current and electromagnetic force become excessive, and there is a problem that may cause quenching or breakage at the connection location.
If the thickness of the copper block is reduced, eddy currents generated in the copper block can be reduced. However, in order to secure the connection strength with the superconducting CIC conductor, a certain thickness is required. Since it is necessary to arrange the two superconducting CIC conductors in parallel, there is a problem that it is difficult to reduce the size of the electrical connection portion of the two superconducting CIC conductors.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a superconducting conductor connection device capable of reducing the size of an electrical connection portion between two superconducting CIC conductors. .
Another object of the present invention is to provide a superconducting conductor connection device that can suppress the generation of Joule heat even when a magnetic field having a large rate of change acts.

The superconducting conductor connection device according to the present invention is a superconducting conductor that electrically connects a first conductive conductor whose outer periphery of a stranded wire is coated with a second conductive conductor whose outer periphery of a stranded wire is covered. In the connecting apparatus, the first insertion port for inserting and electrically connecting the end portion of the first conductive conductor from which the outer sheath is removed and the stranded wire is exposed, and the outer sheath is removed. A plurality of superconducting conductors are formed using a circular tube of an electrically conductive material having a second insertion port for inserting and electrically connecting the end portion of the second conductive conductor from which the stranded wire is exposed. The wire is wired around the outer circumference of the circular tube .

According to this invention, there exists an effect which can attain size reduction of the electrical connection location of the 1st and 2nd electrical conductor.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a superconducting conductor connecting apparatus according to Embodiment 1 of the present invention. In FIG. 1, a superconducting CIC conductor 1 constituting the first conducting conductor has a superconducting stranded wire 2 whose outer periphery is made of stainless steel or incoloy. Etc. However, the outer coating 3 is removed and the superconducting stranded wire 2 is exposed at the end of the superconducting CIC conductor 1 (portion drawn with a dotted line in the figure). In addition, a conduit 2a through which a refrigerant such as liquid helium flows is formed inside the superconducting stranded wire 2.
In the superconducting CIC conductor 4 constituting the second conductive conductor, the outer periphery of the superconducting stranded wire 5 is covered with stainless steel, incoloy or the like. However, the outer coating 6 is removed and the superconducting stranded wire 5 is exposed at the end of the superconducting CIC conductor 4 (portion drawn with a dotted line in the figure). Although not clearly shown in FIG. 1, a conduit 5 a through which a refrigerant such as liquid helium flows is formed inside the superconducting stranded wire 5.

  The circular tube 7 is made of, for example, a high electrical conductive material such as copper, and the insertion port 7a (the first insertion port) into which the end of the superconducting CIC conductor 1 from which the outer sheath 3 is removed and the superconducting stranded wire 2 is exposed is inserted. 1) and an insertion port 7b (second insertion port) for inserting the end of the superconducting CIC conductor 4 from which the outer sheath 6 is removed and the superconducting stranded wire 5 is exposed.

Next, the operation will be described.
When the superconducting CIC conductor 1 and the superconducting CIC conductor 4 are electrically connected, the end portion of the superconducting CIC conductor 1 from which the outer sheath 3 is removed and the superconducting stranded wire 2 is exposed to the insertion port 7 a of the circular tube 7. By inserting, the superconducting stranded wire 2 of the superconducting CIC conductor 1 is electrically connected to the inside of the circular tube 7.
Further, the end portion of the superconducting CIC conductor 4 from which the outer sheath 6 is removed and the superconducting stranded wire 5 is exposed is inserted into the insertion port 7b of the circular tube 7 so that the superconducting stranded wire 5 of the superconducting CIC conductor 4 is circular. It is electrically connected to the inside of the tube 7.

Thereby, for example, a current flowing through the superconducting CIC conductor 1 flows to the superconducting CIC conductor 4 through the circular tube 7, and a current flowing through the superconducting CIC conductor 4 flows to the superconducting CIC conductor 1 through the circular tube 7.
At this time, when a fluctuating external magnetic field acts on the circular tube 7, an eddy current is generated in the circular tube 7. However, since the superconducting CIC conductors 1 and 4 can be electrically connected without being arranged in parallel, the connection portion is small. Can be achieved.

The length of the region in which the circular tube 7 is inserted with the superconducting CIC conductors 1 and 4 is determined so that the DC resistance is reduced by sufficiently contacting the superconducting stranded wires 2 and 5 of the superconducting CIC conductors 1 and 4. To do.
Further, the tube thickness of the circular tube 7 is determined so that the direct current resistance is reduced without impairing the compactness.

  As apparent from the above, according to the first embodiment, the insertion hole 7a for inserting the end portion of the superconducting CIC conductor 1 from which the outer sheath 3 is removed and the superconducting stranded wire 2 is exposed, and the outer sheath The superconducting CIC conductor 1 and the superconducting CIC conductor 1 are constructed using the circular pipe 7 of the electrically conductive material having the insertion port 7b for inserting the end of the superconducting CIC conductor 4 from which the superconducting stranded wire 5 is exposed. There is an effect that the electrical connection location of the superconducting CIC conductor 4 can be reduced in size.

  In the first embodiment, the end portion of the superconducting CIC conductor 1 from which the outer sheath 3 is removed and the superconducting stranded wire 2 is exposed is inserted into the insertion port 7a of the circular tube 7, and the outer sheath 6 is removed. The superconducting stranded wire 5 is exposed and the end of the superconducting CIC conductor 4 is inserted into the insertion port 7b of the circular tube 7. However, the outer sheath 3 is removed and the superconducting stranded wire 2 is exposed. The superconducting CIC conductor 1 is covered with a copper tube, the end is inserted into the insertion port 7a of the circular tube 7, the outer sheath 6 is removed, and the superconducting stranded wire 5 is exposed. The end of the CIC conductor 4 may be covered with a copper tube, and the end may be inserted into the insertion port 7 b of the circular tube 7.

Embodiment 2. FIG.
In the first embodiment, the concentric superconducting CIC conductors 1 and 4 are electrically connected. However, when the superconducting CIC conductors 1 and 4 are eccentric, as shown in FIG. Superconducting CIC conductor 1 and superconducting CIC conductor 4 may be electrically connected using formed circular tube 7.

Further, when the superconducting CIC conductors 1 and 4 arranged in parallel are electrically connected, as shown in FIG. 3, a U-shaped circular tube 7 is used to connect the superconducting CIC conductor 1 to the superconducting CIC conductor 1. The superconducting CIC conductor 4 may be electrically connected.
Also, as shown in FIG. 4, the superconducting CIC conductor 1 and the superconducting CIC conductor 4 may be bent and connected using the same circular tube 7 as the circular tube 7 of FIG.

Embodiment 3 FIG.
5 is a perspective view showing a superconducting conductor connecting apparatus according to Embodiment 3 of the present invention. In the figure, the same reference numerals as those in FIG.
The cooling pipe 8 is attached around the circular pipe 7 in order to allow the refrigerant to flow into and out of the pipe lines 2a and 5a of the superconducting CIC conductors 1 and 4.

The superconducting CIC conductors 1 and 4 are formed with conduits 2a and 5a through which a refrigerant flows. For example, a superconducting state of the superconducting CIC conductors 1 and 4 is maintained by flowing a refrigerant such as liquid helium. .
For example, in FIG. 1 and the like, a mechanism for flowing the refrigerant in and out of the conduits 2a and 5a of the superconducting CIC conductors 1 and 4 is not shown, but it is necessary to provide a refrigerant supply / discharge mechanism separately from the circular pipe 7.

  However, in the third embodiment, since the cooling pipe 8 for allowing the refrigerant to flow into and out of the pipes 2a and 5a of the superconducting CIC conductors 1 and 4 is attached around the circular pipe 7, the refrigerant is supplied separately from the circular pipe 7. There is no need to provide a discharge mechanism, and the effect of reducing the overall size of the apparatus can be obtained.

Embodiment 4 FIG.
FIG. 6 (a) is a perspective view showing a superconducting conductor connecting device according to Embodiment 4 of the present invention, and FIG. 6 (b) is a cross-sectional view showing a superconducting conductor connecting device according to Embodiment 4 of the present invention. is there. In the figure, the same reference numerals as those in FIG.
The superconducting wire 9 is wired on the outer periphery of the circular tube 7 at a predetermined interval according to the direction and rate of change of the externally varying magnetic field. The superconducting wire 9 is fixed to the outer periphery of the circular tube 7 by soldering or the like.

  In the case of the fourth embodiment, similarly to the first embodiment, the end of the superconducting CIC conductor 1 is inserted into the insertion port 7a of the circular tube 7 and the end of the superconducting CIC conductor 4 is inserted into the circular tube 7. Therefore, although the electrical connection location between the superconducting CIC conductor 1 and the superconducting CIC conductor 4 can be reduced in size, the fourth embodiment further reduces the DC resistance, And the device which suppresses generation | occurrence | production of Joule heat is given.

That is, in the fourth embodiment, a plurality of superconducting wires 9 are arranged on the outer periphery of the circular tube 7 in order to reduce the resistance at the electrical connection location between the superconducting CIC conductor 1 and the superconducting CIC conductor 4.
Since the superconducting wire 9 has no resistance, eddy current flows more easily than the circular tube 7, but there is no resistance, so there is no generation amount of Joule heat. Most of the eddy current flows through the superconducting wire 9, and the eddy current flowing through the circular tube 7 decreases.

  Here, the interval and arrangement of the superconducting wires 9 are determined in consideration of the direction and rate of change of the externally varying magnetic field. For example, the generation amount of Joule heat is not minimized if the interval is too wide or too narrow. Therefore, by carrying out trial tests and simulations, the intervals and positions at which the amount of generated Joule heat is minimized are carefully determined.

  As apparent from the above, according to the fourth embodiment, since a plurality of superconducting wires 9 are wired on the outer periphery of the circular tube 7, even if a magnetic field having a large change rate acts, most eddy currents Has the effect of suppressing the generation of Joule heat because it flows through the superconducting wire 9 without resistance.

Embodiment 5 FIG.
In the fourth embodiment, a case where a plurality of superconducting wires 9 are wired on the outer periphery of the circular tube 7 has been shown. However, a plurality of superconducting wires 9 are wired on the inner periphery of the circular tube 7 as shown in FIG. You may make it do.
In this case, the same effect as in the fourth embodiment is obtained, but the current flowing through the circular tube 7 is less when the superconducting wire 9 is wired on the inner periphery of the circular tube 7 than when the superconducting wire 9 is wired on the outer periphery of the circular tube 7. Thus, the direct current resistance at the electrical connection point can be reduced.

Embodiment 6 FIG.
In the fourth embodiment, the case where a plurality of superconducting wires 9 are linearly wired around the outer circumference of the circular tube 7 has been shown. However, as shown in FIG. Alternatively, the wiring may be spirally formed on the inner periphery.
For example, when the direction of the externally varying magnetic field is downward perpendicular to the paper surface, as shown in FIG. 9, the interlinkage area of the superconducting wire 9 is reduced, and the generated eddy current is reduced.
Therefore, there is an effect that generation of Joule heat can be further suppressed as compared with the fourth embodiment.

Embodiment 7 FIG.
FIG. 10 is a perspective view showing a superconducting conductor connecting device according to Embodiment 7 of the present invention. In the figure, the same reference numerals as those in FIG.
The plate 10 is made of a high electrical conductive material such as copper, and is connected to the end of the superconducting CIC conductor 1 from which the outer coating 3 is removed and the superconducting stranded wire 2 is exposed, and the outer coating 6 The superconducting stranded wire 5 is removed and connected to the end of the superconducting CIC conductor 4 which is exposed. The superconducting stranded wires 2 and 5 of the superconducting CIC conductors 1 and 4 and the plate 10 are fixed by soldering or the like.

In the first embodiment, the superconducting CIC conductor 1 and the superconducting CIC conductor 4 are electrically connected by using the circular tube 7 in order to reduce the size of the electrical connection portion between the superconducting CIC conductor 1 and the superconducting CIC conductor 4. However, in the seventh embodiment, since the superconducting CIC conductor 1 and the superconducting CIC conductor 4 are electrically connected using the plate 10, the interlinkage area of the variable magnetic field is larger than that in the first embodiment. Decrease.
Therefore, according to this Embodiment 4, even if a magnetic field with a large change rate acts, the generation amount of an eddy current reduces and there exists an effect which can suppress generation | occurrence | production of Joule heat.
As in the first embodiment, the electrical connection location between the superconducting CIC conductor 1 and the superconducting CIC conductor 4 can be reduced in size.

  In the seventh embodiment, the end portion of the superconducting CIC conductor 1 from which the outer sheath 3 is removed and the superconducting stranded wire 2 is exposed is connected to the plate 10, the outer sheath 6 is removed, and the superconducting stranded wire 5 is formed. Although the end portion of the superconducting CIC conductor 4 exposed is connected to the plate 10, the outer periphery coating 3 is removed and the end portion of the superconducting stranded wire 2 is exposed to the copper. Cover the tube, connect the copper tube to the plate 10, cover the end of the superconducting CIC conductor 4 where the outer sheath 6 is removed and the superconducting stranded wire 5 is exposed, and the copper tube It may be connected to the plate 10.

Embodiment 8 FIG.
In the seventh embodiment, the concentric superconducting CIC conductors 1 and 4 are electrically connected. However, when the superconducting CIC conductors 1 and 4 are eccentric, they are twisted as shown in FIG. The superconducting CIC conductor 1 and the superconducting CIC conductor 4 may be electrically connected using the plate 10.

It is a perspective view which shows the connection apparatus of the superconducting conductor by Embodiment 1 of this invention. It is a perspective view which shows the connection apparatus of the superconducting conductor by Embodiment 2 of this invention. It is a perspective view which shows the connection apparatus of the superconducting conductor by Embodiment 2 of this invention. It is a perspective view which shows the connection apparatus of the superconducting conductor by Embodiment 2 of this invention. It is a perspective view which shows the connection apparatus of the superconducting conductor by Embodiment 3 of this invention. (A) is a perspective view which shows the connection apparatus of the superconducting conductor by Embodiment 4 of this invention, (b) is sectional drawing which shows the connection apparatus of the superconducting conductor by Embodiment 4 of this invention. (A) is a perspective view which shows the connection apparatus of the superconducting conductor by Embodiment 5 of this invention, (b) is sectional drawing which shows the connection apparatus of the superconducting conductor by Embodiment 5 of this invention. (A) is a perspective view which shows the connection apparatus of the superconducting conductor by Embodiment 6 of this invention, (b) is sectional drawing which shows the connection apparatus of the superconducting conductor by Embodiment 6 of this invention. It is explanatory drawing which shows the flow of the eddy current induced by a variable magnetic field. It is a perspective view which shows the connection apparatus of the superconducting conductor by Embodiment 7 of this invention. It is a perspective view which shows the connection apparatus of the superconducting conductor by Embodiment 8 of this invention.

Explanation of symbols

  1 superconducting CIC conductor (first conducting conductor), 2 superconducting stranded wire, 2a pipe, 3 outer sheath, 4 superconducting CIC conductor (second conducting conductor), 5 superconducting stranded wire, 5a duct, 6 outer sheath, 7 circular tube, 7a insertion port (first insertion), 7b insertion port (second insertion), 8 cooling tube, 9 superconducting wire, 10 plate.

Claims (3)

In the superconducting conductor connecting device for electrically connecting the first conductive conductor whose outer periphery of the stranded wire is coated with the second conductive conductor whose outer periphery of the stranded wire is coated, the outer peripheral coating is removed. The first insertion port for inserting and electrically connecting the end portion of the first conductive conductor from which the stranded wire is exposed, and the second, from which the outer sheath is removed and the stranded wire is exposed. A conductive tube having a second insertion port for inserting and electrically connecting the end of the conductive conductor, and a plurality of superconducting wires are wired on the outer periphery of the circular tube. A superconducting conductor connection device used in the presence of a varying magnetic field .   2. The superconducting conductor connection device according to claim 1, wherein a cooling pipe for allowing the refrigerant to flow in and out of the pipe lines of the first and second conductive conductors is attached to the circular pipe. Superconducting conductor of the connection device according to claim 1, wherein a plurality of superconducting wire, characterized in that it is wired in a spiral.

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