JPH04367204A - Immersion cooling system superconducting coil device - Google Patents

Abstract

PURPOSE:To provide a superconducting coil device wherein an immersion cooling system superconducting coil unit which can prevent a high voltage from being applied across a superconducting coil and a coil container is used. CONSTITUTION:A superconducting coil 1 is housed inside a coil container 2 which has been filled with liquid helium 6; it is immersed in the liquid helium 6; an immersion cooling system superconducting coil unit 9 is constituted. In an immersion cooling system superconducting coil device which is formed by connecting a plurality of immersion cooling system super-conducting coil units 9 in series between a low-voltage terminal 7 and a high-voltage terminal 8, a low-voltage side lead terminal 1a of each superconducting coil 1 is connected electrically to each coil container 2 by a connecting conductor 3, and a voltage which is applied across the superconducting coil 1 and the coil container 2 is lowered when an electric current is changed rapidly in a quenching operation or the like.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an immersion-cooled superconducting coil constructed by connecting a plurality of immersion-cooled superconducting coil units in series, each consisting of a superconducting coil immersed in liquid helium filled in a coil container. Regarding equipment.

0002

[Prior Art] Increasing the size of superconducting coil devices for nuclear fusion devices or superconducting power storage devices is being considered; The high voltage generated between the superconducting coil and the coil container, which is at ground potential and houses the superconducting coil, is considered to be a problem. Therefore, when increasing the size of the superconducting coil device,
In order to cope with this high voltage, it is considered essential to adopt a forced cooling superconducting coil unit with excellent withstand voltage characteristics.
Forced cooling superconducting coil units are being actively researched. This forced cooling superconducting coil unit is configured to cool the superconducting coil by forced circulation of liquid helium in the helium channel in the superconducting conductor that makes up the superconducting coil, but it is still in the development and research stage and is stable. There are many problems in terms of performance and manufacturability, and it has not yet been put into practical use. On the other hand, the immersion-cooled superconducting coil device using the immersion-cooled superconducting coil unit disclosed in Japanese Patent Application Laid-Open No. 64-20602 has a proven track record in terms of stability and manufacturability. It is conceivable to adopt this immersion cooling type superconducting coil device to increase its size.

0003

[Problems to be Solved by the Invention] However, in a superconducting coil device using an immersion-cooled superconducting coil unit, the current changes rapidly, such as during quenching, and the inductance of the superconducting coil changes accordingly. When a corresponding voltage is generated, the superconducting coil is placed in an atmosphere of gas helium produced by the evaporation of liquid helium, which has poor voltage resistance properties.
The generation of high voltage between the coil container, which is at ground potential, and the superconducting coil is a serious problem, and it is difficult to increase the size of the device.

An object of the present invention is to provide a superconducting coil device using an immersion cooling type superconducting coil unit that can prevent high voltage from being applied between the superconducting coil and the coil container.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an immersion-cooled superconducting coil unit located at least on the high voltage terminal side among a plurality of immersion-cooled superconducting coil units electrically connected in series. The present invention is characterized in that a part of the superconducting coil in the conductive coil unit and the coil container are electrically connected so that they are at approximately the same potential.

[0006]

[Function] In the immersion-cooled superconducting coil device of the present invention, as described above, electrical connection is made between the part of the superconducting coil in the immersion-cooled superconducting coil unit located at least on the high voltage terminal side and the coil container. For example, in a superconducting coil device configured by electrically connecting N coil units in series, the voltage generated in the superconducting coil of one coil unit is E0, and the power supply terminal of the entire coil device is If the voltage generated between them is E, and the part of the superconducting coil that is electrically connected to the coil container is one outlet, then one outlet of the superconducting coil and the coil container are electrically connected. The voltage applied between the high voltage side (the other outlet side) of the superconducting coil in the coil unit located at least on the high voltage terminal side connected to the coil container and the coil container is generated in the superconducting coil of one coil unit. voltage E0 (≒E0× N) can be approximately 1/N. In this way, high voltage is not applied between the superconducting coil and the coil container in the immersion-cooled superconducting coil unit, where voltage resistance is a problem, and the voltage can be accommodated in a space with sufficient space, for example. Electrical insulation can be ensured between the coil container and the pedestal that supports it, and therefore it becomes possible to increase the size of the immersion cooling type superconducting coil device.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing an immersion cooling type superconducting coil device according to an embodiment of the present invention together with potential distribution. A plurality of immersion-cooled superconducting coil units 9 are connected in series between the low voltage terminal 7 and the high voltage terminal 8. Each superconducting coil unit 9 is constructed by storing a superconducting coil 1 electrically insulated by an insulator 10 in a coil container 2 filled with liquid helium 6 and immersing it in liquid helium 6. The low voltage terminal side lead wire 1a of the conductive coil 1 and the coil container 2 are electrically connected by a connecting conductor 3.

Therefore, the coil container 2 of the immersion-cooled superconducting coil unit 9 located on the side of the low voltage terminal 7 is at ground potential, and the coil container 2 can be easily supported on a stand (not shown). 2 and the superconducting coil 1, an insulator 10 is connected between the high voltage side lead wire 1b of the superconducting coil 1 and the coil container 2 in consideration of the voltage E0 applied between the high voltage side lead wire 1b and the coil container 2.
It is sufficient to set Also, in the immersion cooling type superconducting coil unit 9 located on the high voltage terminal 8 side, the low voltage side outlet wire 1a of the superconducting coil 1 and the coil container 2 are electrically connected by the connecting conductor 3. Same potential (N-1)E
0, this coil container 2 and superconducting coil 1
Similarly, insulation is performed by considering only the voltage E0 applied between the high voltage side lead wire 1b of the superconducting coil 1, which is at the E (≒NE0) potential, and the coil container 2, which is at the (N-1) E0 potential. Thing 1
It is sufficient to set it to 0. In addition, in this case, the coil container 2 is (
N-1) Since the potential is as high as E0, it is necessary to insulate and support the pedestal, etc., which is at ground potential, so that it can withstand this high potential.

Similarly, in each immersion cooling type superconducting coil unit 9, the voltage applied between the coil container 2 and the superconducting coil 1 satisfies E0≈E/N. As can be seen from the comparison with the conventional configuration in which the connecting conductor 3 is removed, the immersion cooling type superconducting coil unit 9 located on the low voltage terminal 7 side
The voltage applied between the superconducting coil 1 and the coil container 2 is the same in the conventional configuration because the coil container 2 is at ground potential, but in other immersion cooling type superconducting coil units, such as high voltage terminals. Superconducting coil 1 and coil container 2 in immersion cooling type superconducting coil unit 9 on side 8
In the conventional configuration, the voltage applied between them is the voltage E (≒
NE0), whereas the voltage is E0 (≈E/N), and the simple insulator 10 can maintain insulation between the two. Further, since the voltages applied between the superconducting coil 1 and the coil container 2 in each immersion cooling type superconducting coil unit 9 are approximately equal, each immersion cooling type superconducting coil unit 9 can have the same structure.

[0010] Details regarding the support of each immersion-cooled superconducting coil unit 9 to the pedestal of the coil container 2 will be described later. This can be easily dealt with by providing an insulator. In addition, in the above embodiments, for all immersion-cooled superconducting coil units, the low voltage side lead wire 1a of the superconducting coil 1 was connected to the coil container 2 through the connecting conductor 3. The part of the superconducting coil 1 connected to the low voltage side is not limited to the lead wire 1a,
The middle part of the superconducting coil 1 may be used. In this case, for example, if the middle part of the superconducting coil 1 is electrically connected to the coil container 2, the voltage between the coil container 2 and both ends of the superconducting coil 1 will be E0/2, and the insulator 10 that insulates the two can be made even simpler. Also, the same effect can be obtained by electrically connecting the high voltage side lead wire 1b of the superconducting coil 1 to the coil container 2 with the connecting conductor 3, but it is better to connect them on the low voltage terminal 7 side. It becomes easy to insulate and support the coil container 2 on a frame at ground potential. Furthermore, the connection position between the two is determined by each immersion cooling type superconducting coil unit 9.
The same effect can be obtained even if you change it every time.

FIG. 2 is a cutaway plan view of essential parts of a superconducting toroidal coil device to which the present invention is applied. The immersion cooling superconducting coil unit 9 is constructed by immersing the superconducting coil 1 in liquid helium 6 filled in the coil container 2, and electrically connects a plurality of immersion cooling superconducting coil units 9 in series. Output wires 1a and 1b on the low voltage side and coil container 2 are electrically connected by connecting conductor 3. As shown in FIG. 3, which is a front view of FIG.
It is supported and fixed. Between the coil container 2 and the pedestal 5,
There is more space for insulation than between the superconducting coil 1 and the coil container 2, and the conditions are more favorable for insulation than in the gas helium atmosphere inside the coil container 2, so insulation can be easily performed. can be administered. In particular, conventionally, the immersion cooling type superconducting coil unit 9 located closest to the high voltage terminal 8 as shown in FIG. However, according to this embodiment, the frame 5
Since insulation can be easily maintained between the coil container 2 and the coil container 2, it is easy to increase the size of the superconducting coil device.

FIG. 4 is a longitudinal sectional front view of a superconducting helical coil device according to another embodiment of the present invention. A helical groove is formed on the outer periphery of the vacuum container 20, and a superconducting coil 1 is housed in this groove. An immersion cooling type superconducting coil unit 9 is constructed by being immersed in the coil. The immersion cooling type superconducting coil unit 9 is supported by a pair of semi-cylindrical coil container supporting shells 21 disposed on the outer periphery of the coil container 2, and the pair of coil container supporting shells 21 are opposed to each other. The parts are electrically insulated and connected by insulators 22 to form a cylindrical shape. Both coil container supporting shells 21 are connected to support legs 13 so as not to be short-circuited to each other.
An insulator 4 is interposed between the frame 5 and the frame 5. Each superconducting coil 1 is electrically connected in series, and the lead wire 1a on the low voltage terminal 7 side and the coil container 2 are electrically connected via the connecting conductor 3 and the coil container supporting shell 21. Ori,
As a result, the potential described in the previous embodiment is applied to the coil container 2 and the coil container supporting shell 21, so that these and the pedestal 5 are electrically insulated by the insulator 4.

[0013] Also in the superconducting helical coil device having such a configuration, each immersion cooling type superconducting coil unit 9
The voltage applied between the superconducting coil 1 and the coil container 2 is determined by the number of immersion-cooled superconducting coil units 9, where E is the voltage generated between terminals 7 and 8 due to sudden current changes such as quenching, etc. When N is approximately E/N, insulation between the two becomes easy. On the other hand, insulation is required between the coil container 2 and the coil container supporting shell 21 and the pedestal 5, but since insulation in these parts is easy, it is possible to increase the size of the superconducting helical coil device with a simple configuration. .

In each of the above embodiments, the superconducting coil 1 and the coil container 2 are electrically connected by the connecting conductor 3 in all of the plurality of immersion cooling type superconducting coil units 9. As shown in Fig. 1, the coil container 2 in the immersion cooling type superconducting coil unit on the low voltage terminal 7 side can be set to the ground potential as in the conventional case, and the same effect can be obtained. Regarding the immersion cooling type superconducting coil unit disposed at least on the high voltage terminal 8 side, where a high voltage is applied between the superconducting coil 1 and the coil container 2 when the voltage is set to a potential, a high voltage is applied between the superconducting coil and the coil container. should be electrically connected.

[0015]

As explained above, according to the present invention, at least a part of the superconducting coil in the immersion cooling type superconducting coil unit located on the high voltage terminal side and the coil container are electrically connected. This prevents high voltage from being applied between the two during quenching, etc., and simplifies the insulation between the two.Also, the insulation can be easily maintained between the pedestal, etc. and the coil container. It is possible to increase the size of the cooling type superconducting coil device.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an immersion-cooled superconducting coil device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of an immersion-cooled superconducting coil device according to another embodiment of the present invention.

3 is a front view of the immersion cooling type superconducting coil device shown in FIG. 2. FIG.

FIG. 4 is a longitudinal sectional front view of an immersion-cooled superconducting coil device according to still another embodiment of the present invention.

[Explanation of symbols]

1 Superconducting coil 2 Coil container 3 Connection conductor 4 Insulator 5 Mount 6. Liquid helium 7 Low voltage terminal 8 High voltage terminal

Claims (4)

[Claims] Claim 1: A superconducting coil is housed in a coil container filled with liquid helium and immersed in the liquid helium to form an immersion-cooled superconducting coil unit, and a plurality of the immersion-cooled superconducting coil units are connected to a low voltage. In an immersion-cooled superconducting coil device that is electrically connected in series between a terminal and a high-voltage terminal, at least one immersion-cooled superconducting coil unit located on the high-voltage terminal side among the plurality of immersion-cooled superconducting coil units is provided. An immersion cooling type superconducting coil device, characterized in that a part of the superconducting coil in the coil unit and the coil container are electrically connected. 2. The electrical connection according to claim 1, wherein the electrical connection is made by connecting the low voltage terminal side outlet of the superconducting coil and the coil container with a connecting conductor. An immersion-cooled superconducting coil device characterized by: 3. The electrical connection according to claim 1, wherein the electrical connection is made by connecting the middle part of the superconducting coil and the coil container with a connecting conductor. Immersion cooling superconducting coil device. 4. A superconducting coil is housed in a coil container filled with liquid helium and immersed in liquid helium to form an immersion-cooled superconducting coil unit, and a plurality of the immersion-cooled superconducting coil units are connected to a low voltage. In an immersion-cooled superconducting coil device that is electrically connected in series between a terminal and a high-voltage terminal, at least one immersion-cooled superconducting coil unit located on the high-voltage terminal side among the plurality of immersion-cooled superconducting coil units is provided. An immersion cooling type superconducting coil device, characterized in that a part of the superconducting coil in the coil unit and the coil container are electrically connected, and the coil container is supported and fixed to a frame via an insulator. .