JP5273572B2 - Laying the superconducting cable - Google Patents

Description

  The present invention relates to a method for laying a superconducting cable for constructing a superconducting power transmission network in a pipeline or the like.

  In general, a superconducting cable has a configuration in which a conductor portion having a superconducting conductor layer on the outer periphery of a former is housed in a heat insulating tube made of a double metal tube. In such a superconducting cable, there are the following two configurations for electrically insulating the superconducting cable from the outside. The first configuration is a low-temperature insulating configuration in which a cable core having a superconducting conductor layer and an electrical insulation layer is housed in the heat insulating tube on the former, and the electrical insulation layer provided in the cable core is also cooled by a refrigerant. (For example, Patent Document 1). The second configuration is a room temperature in which a conductor portion including a former and a superconducting conductor layer is accommodated in the heat insulating tube, and an electric insulating layer is formed on the heat insulating tube, and the electric insulating layer is not cooled by the refrigerant. It is an insulation type structure (for example, refer nonpatent literature 1). In particular, the latter room-temperature insulated superconducting cable has an advantage that the insulation material and structure of an existing normal conducting cable can be applied.

JP 2010-238427 A

"Experimental 35kV / 121MVA Superconducting Cable System Installed at Pujy Substituting in Southern China Power Grid 1 Transactions on Electric 13"

  The above-described superconducting cable is manufactured in a factory as a unit length superconducting cable including at least a superconducting conductor layer, a heat insulating tube, and an electric insulating layer. Then, the superconducting cable of the unit length is wound around a drum or the like and conveyed to a laying site, and is unwound from the drum at the laying site. However, the laying operation has some problems due to the configuration of the unit length superconducting cable as shown below.

  First, as already described, since the superconducting cable has a configuration in which a large number of layers such as at least a superconducting conductor layer, a heat insulating tube, and an electric insulating layer are laminated, each layer behaves individually. Therefore, when the superconducting cable is unwound from the drum, the movement of each layer interferes and it is difficult to unwind the superconducting cable, and each layer may be damaged due to the relative behavior of each layer. May be greatly deformed (elongated).

  Secondly, a superconducting cable having a structure in which a large number of layers are laminated mainly has a double-ply structure heat insulating pipe and generally has a high bending rigidity. Moreover, when a heat insulation pipe | tube is made into a corrugated shape, there also exists a problem that a heat insulation pipe | tube tends to extend. Therefore, it is necessary to consider a guide or the like at the bent portion of the superconducting cable when laying, and it is necessary to prevent excessive tension and stress history from being applied to the superconducting conductor layer. In particular, since superconducting cables are being laid and placed in the same way as existing cables in pipes where existing normal conducting cables are laid, superconducting cables with large bending rigidity will damage the superconducting conductor layer. There is a demand for a method of drawing a superconducting cable into a pipe line with a lower tension without giving any stress.

  The present invention has been made in view of the above circumstances, and one of its purposes is to provide a superconducting cable laying method capable of improving the laying workability of a superconducting cable as compared with the prior art.

  The present invention usually achieves the above-mentioned object by allowing a superconducting cable manufactured at a factory to be completed at a construction site without being completed at the factory.

The present invention relates to a method for laying a superconducting cable including a superconducting conductor layer and an electrical insulating layer, and is characterized by comprising the following steps α to γ.
(Step α) A tubular member and a long member, which become superconducting cables by being combined, are individually prepared at the laying site. Here, it becomes a superconducting cable by arrange | positioning a elongate member inside a tubular member.
(Step β) The tubular member prepared in step α is laid at the laying site.
(Step γ) The long member prepared in step α is inserted into the tubular member laid in step β.

  As shown in the laying method of the superconducting cable of the present invention, the superconducting cable is divided into a tubular member and a long member, so that the number of laminated members of the tubular member and the long member can be determined by the tubular member and the long member. This is less than the number of laminated members of the superconducting cable which is a combination of the above. For this reason, both the tubular member and the long member have lower bending rigidity than the superconducting cable and are easy to handle. Therefore, according to the laying method of the superconducting cable of the present invention, it is possible to lay the superconducting cable more easily than laying the superconducting cable as it is.

  As one form of the laying method of the superconducting cable of the present invention, the long member is preferably longer than the tubular member.

  By using a long member longer than the tubular member, the long member can be exposed from both ends of the tubular member in the laid superconducting cable. As a result, when constructing a superconducting cable line by laying a plurality of superconducting cables and connecting them, it becomes easy to connect the superconducting cables.

  Moreover, it is preferable that the length of the long member is longer than the length of the plurality of continuous tubular members.

  In this case, as shown in Embodiment 2 to be described later, the number of connections of the long members can be reduced, and a superconducting cable line can be constructed efficiently.

  As one form of the laying method of the superconducting cable of the present invention, the superconducting cable to be used can be a room-temperature insulated superconducting cable having a low-temperature conductive part and a room-temperature covering part. The low-temperature conductive portion includes a conductor portion formed by forming a superconducting conductor layer on the outer periphery of the former, and a heat insulating tube that accommodates the conductor portion therein and maintains the conductor portion at an extremely low temperature. Moreover, the normal temperature coating | coated part has an electrical insulation layer (henceforth a normal temperature side electrical insulation layer) surrounding the outer periphery of a heat insulation pipe | tube. Note that the superconducting cable to be used can be a low-temperature insulated superconducting cable as shown in the embodiments described later.

  Here, the configuration of the room-temperature insulated superconducting cable consists of a “separated type” configuration in which the low-temperature conductive portion and the normal-temperature coating portion are independent, and a part of the low-temperature conductive portion and the normal-temperature coating portion that are integrated. It can be divided into the “integrated” configuration. The “separated” configuration can further divide the low temperature conductive portion into a conductor portion and a heat insulating tube. In each case, which part of the superconducting cable becomes the tubular member and the long member in the superconducting cable laying method of the present invention is different. Therefore, the configuration of the “separated type” and the configuration of the “partially integrated type” will be specifically described.

<Installation method of separated superconducting cable>
First, when carrying out the laying method of the superconducting cable of the present invention using a separate room temperature insulated superconducting cable, the superconducting cable before laying is prepared separately in a low temperature conductive part and a room temperature covering part (step α). ). And the prepared normal temperature coating | coated part is laid as a tubular member in the installation site (process (beta)), and a low-temperature conductive part is inserted in a normal temperature coating | coated part as an elongate member accommodated in a tubular member after that (process (gamma)).

  Note that the low-temperature conductive part may be further divided into a conductor part and a heat insulating tube. In that case, in step β, the room temperature coated portion is laid as a tubular member on the laying site, and in step γ, the heat insulating tube is inserted into the room temperature coated portion of the tubular member, and the conductor portion is further inserted inside the heat insulating tube.

  According to the separated type room temperature insulated superconducting cable, when the low temperature conductive part deteriorates with use after installation, only the low temperature conductive part can be replaced.

  Moreover, in the laying method using the separated room-temperature insulated superconducting cable, it is preferable that the room-temperature coated part or the low-temperature conductive part further includes a shunt conductor that shares an excessive abnormal current typified by a short-circuit current. In the former case, the shunt conductor is preferably formed inside the room temperature side electric insulation layer in the room temperature coating. In the latter case, the shunt conductor is preferably formed outside the heat insulating tube of the low temperature conductive portion.

  By providing the shunt conductor, it is possible to suppress deterioration of the superconducting conductor layer provided in the low temperature conductive portion due to the abnormal current. In addition, since the shunt conductor is disposed outside the heat insulating tube, whether it is provided at the room temperature covering portion or the low temperature conductive portion, the Joule heat generated in the shunt conductor due to the abnormal current flows inside the heat insulating tube. There is no sudden rise in the temperature of the flowing refrigerant. As a result, the superconducting cable line can be returned to normal operation in a short time after the occurrence of an abnormal current.

<How to install a partially integrated superconducting cable>
When the superconducting cable laying method of the present invention is carried out using a partially integrated room-temperature insulated superconducting cable, the superconducting cable before laying is composed of a conductor part and other configurations (that is, the outer periphery of the heat insulating tube is coated at room temperature) Insulating pipes with a covering part formed integrally with a cover part) (step α). Then, the prepared heat insulating tube with a covering portion is laid as a tubular member on the laying site (step β), and then the conductor portion is inserted into the heat insulating tube with a covering portion as a long member to be inserted into the tubular member (step γ).

  According to the partially integrated superconducting cable, when the conductor portion deteriorates with use after laying, only the conductor portion can be replaced. In addition, according to the partially integrated superconducting cable, the room temperature coating portion is formed directly on the heat insulating tube, and there is no gap between them, so that the outer diameter of the superconducting cable can be reduced.

  Moreover, in the laying method using the partially integrated type room-temperature insulated superconducting cable, it is preferable that the heat insulating tube with a covering portion further includes a shunt conductor. The shunt conductor is formed outside the heat insulating tube in the heat insulating tube with the covering portion and inside the normal temperature side electric insulating layer, and shares the current during the abnormality.

  Even if a shunt conductor is provided in a partially integrated room-temperature insulated superconducting cable, the deterioration of the superconducting conductor layer due to an abnormal current can be suppressed in the same way as when a shunt conductor is provided in a separate room-temperature insulated superconducting cable. The time from the occurrence of an abnormal current to the return to normal operation can be shortened.

  According to the laying method of the superconducting cable of the present invention, the laying of the superconducting cable at the laying site can be facilitated.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing of the installation method of the superconducting cable of this invention described in Embodiment 1, Comprising: (A) shows a mode that a tubular member is installed in the pipe line buried in the ground, (B) A state in which a long member having a superconducting conductor layer is inserted into the tubular member is shown in (C) where a superconducting cable is laid in the pipe. (A) is a schematic cross-sectional view of a room-temperature insulated superconducting cable that is a separate type and has a shunt conductor on the side of the room-temperature covering portion, and (B) is a cross-sectional view showing a state before assembly. (A) is a schematic cross-sectional view of a room-temperature-insulated superconducting cable that is a separate type and has a shunt conductor on the low-temperature conductive part side, and (B) is a cross-sectional view showing a state before the assembly. (A) is a schematic cross-sectional view of a partially integrated room-temperature insulated superconducting cable, and (B) is a cross-sectional view showing a state before assembly. (A) is a schematic cross-sectional view of a low-temperature insulated superconducting cable, and (B) is a cross-sectional view showing a state before the assembly. It is a schematic explanatory drawing of the laying method of the superconducting cable of the present invention described in Embodiment 2, wherein (A) shows a state in which a tubular member is laid in a pipe line buried in the ground. A state in which a long member having a superconducting conductor layer is inserted into the tubular member is shown in (C) where a superconducting cable is laid in the pipe.

<Embodiment 1>
In the present embodiment, as shown in FIG. 1, a procedure for laying the superconducting cable 1 in a pipe line 8 buried in the ground will be described. Since the laying procedure includes steps α to γ, each step will be described in turn. In the following description including Embodiment 1, members described with common reference numerals are members having the same configuration.

≪Process α≫
In the process α, the tubular member 2 and the long member 3 that are combined to form the superconducting cable 1 are prepared at the installation site. By arranging the long member 3 inside the prepared tubular member 2, the superconducting cable 1 is obtained. Here, the superconducting cable 1 includes a low temperature insulated superconducting cable and a room temperature insulated superconducting cable, and the latter room temperature insulated superconducting cable further includes a separation type and a partially integrated type. Of these “low temperature insulation type”, “room temperature insulation type and separation type”, and “room temperature insulation type and partially integrated type”, the tubular member depends on which type is adopted as the superconducting cable 1 2 and the structure of the elongate member 3 are also different. The specific configuration of the superconducting cable 1 according to the type, and the configuration of the tubular member 2 and the long member 3 at that time will be described after the description of the process.

≪Process β≫
First, as shown in FIG. 1A, the tubular member 2 is introduced from the ground opening portion of the manhole 9 on the introduction side, and the tubular member 2 is laid in a conduit 8 buried in the ground. In laying the tubular member 2, a retracting wire is attached in series to the tubular member 2, the retracting wire is pulled out from the ground opening of the reaching manhole, and the retracting wire is drawn by a winding-type traction device (not shown). By pulling, the tubular member 2 is drawn into the pipe line 8.

  Here, since the tubular member 2 is a part of the superconducting cable 1, it is more flexible than the superconducting cable 1, is lighter than the superconducting cable 1, and is easy to handle. The lightweight tubular member 2 can draw the superconducting cable 1 into the pipe line 8 with a smaller traction load than pulling the superconducting cable 1 into the pipe line 8 as it is. Is less likely to be damaged. Further, the tubular member 2 having excellent flexibility is easy to bend, and can be easily drawn into the manhole 9 from the opening of the manhole 9, and can be easily drawn into the duct 8 from the manhole 9.

≪Process γ≫
Next, as shown in FIG. 1B, the long member 3 is introduced from the ground opening of the manhole 9, and the long member 3 is inserted into the tubular member 2 laid in the duct 8. The long member 3 may be pulled similarly to the pulling of the tubular member 2. Here, since the long member 3 is also more flexible and lighter than the superconducting cable 1, similarly to the tubular member 2, the long member 3 is a tubular laid in the pipe line 8 from the manhole 9 with a small traction load. It can be easily pulled into the member 2. Moreover, the elongate member 3 which is excellent in flexibility and lightweight is not violently rubbed by the tubular member 2, and is not easily damaged.

  When the process β is completed, the superconducting cable 1 is laid in the conduit 8 as shown in FIG. Thereafter, the superconducting cable lines are completed by connecting the long members 3 of the superconducting cables 1 facing each other at the positions of the manholes 9 and then connecting the tubular members 2 to each other.

  According to the laying method of the superconducting cable of the present invention described above, the superconducting cable 1 is divided into the tubular member 2 and the long member 3, and the handling of the members 2 and 3 is facilitated. Can be easily. Since the diameter of the long member 3 is smaller than that of the tubular member 2, the length (transport length) of the long member 3 that can be wound around the drum can be made longer than that of the tubular member 2.

<< 1. Separated room-temperature insulated superconducting cable-Part 1 >>
As shown in FIG. 2 (B), a separate room temperature insulated superconducting cable 100 shown in FIG. 2 (A) includes a separately manufactured low-temperature conductive portion 30 and a pipe that houses the low-temperature conductive portion 30 therein. It is formed by combining the room-temperature coating | coated part 20 in the installation site. When the room temperature insulated superconducting cable 100 having such a configuration is used, the superconducting cable 100 is laid according to the procedure shown in FIG. 1 with the room temperature covering portion 20 as the tubular member 2 and the low temperature conductive portion 30 as the long member 3. Hereinafter, each configuration of the room temperature insulated superconducting cable 100 will be described in detail.

{Low-temperature conductive part}
The low temperature conductive part 30 is a long body in which the conductor part 10 is accommodated inside the heat insulating tube 13.

[Conductor]
The conductor 10 typically includes a former 11, a superconducting conductor layer 12, and a protective layer (not shown) in order from the center. The former 11 is a member used as a support for the superconducting conductor layer 12. For example, a pipe-shaped hollow body as shown in FIG. 2 can be used as the former 11. The hollow former 11 can use the inside as a flow path of the refrigerant 131. As the shape of the former 11, a solid body can be used in addition to the hollow body. On the other hand, the material of the former 11 is not particularly limited. If the former 11 is simply used as a support for the superconducting conductor layer 12, the former 11 may be made of a non-conductive material such as a resin, and the former 11 also has a function as a current shunt path for abnormal current. If it can be used, it may be made of a normal conducting metal material such as copper or aluminum. Taking the above into consideration, the concrete configuration of the former 11 is exemplified. For example, the hollow body former 11 may be a pipe made of a metal material, and the solid former 11 may be enamel, for example. The thing which twisted together the some metal wire provided with this insulation coating can be mentioned.

  Next, as the superconducting conductor layer 12, for example, a tape-like wire material including an oxide superconductor can be suitably used. Examples of the tape-shaped wire include Bi2223 superconducting tape wire (sheath wire in which a filament made of an oxide superconductor is arranged in a stabilizing metal such as Ag-Mn and Ag), RE123 thin film wire (RE: rare earth element, For example, Y, Ho, Nd, Sm, Gd, etc. (Laminated wire material in which an oxide superconducting phase is formed on a metal substrate). The superconducting conductor layer 12 includes a single layer structure or a multilayer structure formed by spirally winding the tape-shaped wire.

  A protective layer (not shown) protects the superconducting conductor layer 12 and insulates between the heat insulating tube 13 and the superconducting conductor layer 12, and can be formed by winding kraft paper or the like.

[Insulated pipe]
The heat insulating tube 13 that houses the conductor portion 10 includes an inner tube 14 that houses the conductor portion 10 therein, and an outer tube 15 that houses the inner tube 14 inside. The inner tube 14 is filled with a refrigerant 131 (typically liquid nitrogen, liquid helium, helium gas, etc.) for maintaining the superconducting conductor layer 12 in a superconducting state, and functions as a refrigerant flow path. By forming the heat insulating tube 13 with the inner tube 14 and the outer tube 15 provided on the outer periphery of the inner tube 14, it is possible to suppress the temperature of the refrigerant 131 from rising due to heat entering from the outside. A vacuum is drawn between the inner tube 14 and the outer tube 15 to form a vacuum heat insulating layer. In addition, if a heat insulating material such as super insulation or a spacer that separates the inner tube 14 and the outer tube 15 is disposed between the inner tube 14 and the outer tube 15, the heat insulating property of the heat insulating tube 13 can be improved. In addition, in this embodiment, although the heat insulation pipe | tube of a double pipe structure is utilized as a heat insulation pipe | tube, you may utilize the heat insulation pipe | tube more than a triple pipe.

  Examples of the constituent material of the inner tube 14 and the outer tube 15 include metals such as stainless steel, aluminum, and alloys thereof. Since the metal is excellent in corrosion resistance, it is suitable as a constituent material of the heat insulating tube 13 for holding and transporting various fluids. The materials of both pipes 14 and 15 may be different. Both pipes 14 and 15 should be corrugated pipes that have been corrugated over their entire length, or straight pipes made of a relatively soft and flexible material such as aluminum or its alloys. Can be bent. By adopting the heat insulating tube 13 having flexibility in this way, the superconducting cable 100 can be easily bent at the time of transportation or laying. Furthermore, by forming the heat insulating tube 13 with a corrugated tube, the heat stress can be relieved by deformation when the heat insulating tube 13 is cooled by the refrigerant 131 and thermally contracts.

[Other configurations]
It is preferable that the low-temperature conductive part 30 that is the long member 3 includes a tension member that shares the traction tension when the low-temperature conductive part 30 is pulled into the room temperature coating part 20. The tension member is a member for suppressing damage to the low temperature conductive portion 30 caused by the traction tension by sharing the traction tension. However, since the low-temperature conductive portion 30 is lightweight and excellent in flexibility, the tension member can be simplified. In some cases, the tension member can be omitted.

{Room temperature coating}
The room temperature coating portion 20 shown in the figure includes a pipe-shaped structure 21, a shunt conductor 22 formed on the outer periphery of the pipe-shaped structure 21, and a normal-temperature side electric insulating layer 23 formed on the outer periphery of the shunt conductor 22. Prepare. Of these configurations, the pipe-like structure 21 or the shunt conductor 22 can be omitted.

[Pipe-like structure]
The pipe-like structure 21 is a member that retains the shunt conductor 22 and the room-temperature-side electrical insulating layer 23 formed on the outer peripheral surface thereof, and the most important characteristic is high strength. In order to give the superconducting cable 100 a predetermined flexibility, the pipe-like structure 21 is also required to have a predetermined flexibility. In consideration of these points, as the pipe-like structure 21, an aluminum straight pipe, a SUS corrugated pipe, or the like can be used. In addition, the pipe-like structure 21 may be made of a non-conductive material such as resin. Here, if the pipe-like structure 21 is a conductive material, it can also share a part of the function of the shunt conductor 22 itself.

[Branch conductor]
The shunt conductor 22 is a normal conducting conductor that shares an abnormal current when an abnormal current is generated. The shunt conductor 22 is connected to the superconducting conductor layer 12 at a connecting portion in the longitudinal direction of the superconducting cable line (such as an intermediate connecting portion or a terminal connecting portion of the superconducting cable 100). Can be shared.

  By providing the shunt conductor 22, it is possible to avoid deterioration of the superconducting conductor layer 12 due to a temperature rise due to excessive current flowing through the superconducting conductor layer 12 and the former 11 when an abnormal current is generated. In addition, since the shunt conductor 22 for sharing the abnormal current is provided in the room temperature coating portion 2, the refrigerant 131 of the low temperature conductive portion 30 is not heated by the Joule heat generated in the shunt conductor 22. Therefore, the refrigerant 131 can be prevented from being heated and gasified, and the time for cooling the refrigerant 131 to an operable temperature can be shortened. Can be returned to normal operation.

  The shunt conductor 22 is composed of a metal material having a higher conductivity than that of the pipe-like structure 21, that is, a metal material such as copper, aluminum, or silver having a lower electric resistance value, from the viewpoint of sharing the current during an abnormality. . In particular, copper is suitable as the shunt conductor 22 in that it has the second highest conductivity after silver and is much cheaper than silver.

  The said shunt conductor 22 can be formed by winding the member according to the conductor of the existing normal conducting cable, such as a segment conductor comprised with a copper strand wire, on the pipe-shaped structure 21. As shown in FIG.

  The cross-sectional area of the shunt conductor 22 may be appropriately selected depending on how much abnormal current can be generated in the operation of the superconducting cable line and how much the generated abnormal current is borne by the shunt conductor 22. . For example, when the former 11 of the low-temperature conductive portion 30 described above is made of a non-conductive material, the cross-sectional area of the shunt conductor 22 is determined so that most of the abnormal current can flow through the shunt conductor 22, and the shunt conductor 22 and the superconductor The superconducting conductor layer 12 is protected by sharing an abnormal current with the metal component of the conductor layer 12. Further, if the former 11 is made of a conductive material and the abnormal current is not only shared by the metal components of the shunt conductor 22 and the superconducting conductor layer 12 but is also shared by the former 11, the shunt conductor 22 is sufficient. What is necessary is just to determine the cross-sectional area of the shunt conductor 22 so that the electric current at the time of abnormality can be sent. Moreover, it is also effective to make a shunt conductor with reduced AC resistance by using a copper insulated wire as the insulated wire.

[Room-temperature electrical insulation layer]
The room temperature side electrical insulation layer 23 is a layer that electrically insulates the superconducting cable 100 from the external environment. The room-temperature side electrical insulation layer 23 can be made of a material having an excellent electrical insulation strength that has been proven in ordinary conductive cables, typically, crosslinked polyethylene (XLPE) used for CV cables. If the insulating resin such as cross-linked polyethylene is used, the room-temperature-side electrical insulating layer 23 can be easily formed simply by extruding the insulating resin on the outer periphery of the tubular member in which the shunt conductor 22 is formed on the pipe-like structure 21. In addition, the room temperature side electrical insulation layer 23 can employ the same configuration as the insulation layer in the OF cable. For example, the room temperature side electrical insulation layer 23 can be formed by winding tape-like kraft paper or semi-synthetic paper around the outer periphery of the shunt conductor 22 in multiple layers and impregnating the insulation layer with insulation oil such as synthetic oil. .

[Other configurations]
An outer shielding layer (not shown) made of a normal conducting material such as copper or aluminum is typically provided on the outer periphery of the room temperature side electrical insulating layer 23. The outer shielding layer provides a potential outside the insulating layer 23, and a normal conductive material can be used as in the case of a conventional power cable. Therefore, the manufacturability 100 of the superconducting cable is excellent in manufacturability. Further, on the outer periphery of the outer shielding layer, an anticorrosion layer (not shown) having a predetermined insulating characteristic is provided while protecting the outer shielding layer.

  In addition, it is preferable that the room temperature coating portion 20 includes a tension member. However, since the room temperature coating portion 20 is lightweight, the tension member can be simplified. In the configuration including the pipe-like structure 21 and the shunting conductor 22, traction tension can be shared by the pipe-like structure 21 and the shunting conductor 22 in the first place, so that the tension member can be omitted.

  It should be noted that tension members are provided in the portion that becomes the tubular member 2 and the portion that becomes the long member 3 in the “partially integrated type room temperature insulated superconducting cable” and “low temperature insulated superconducting cable” described below. Is preferred. In particular, in any configuration of the superconducting cable, when the heat insulating pipe 13 is formed of a corrugated pipe, it is preferable to provide a tension member on a towing target including the corrugated pipe. By doing so, it can suppress that the corrugated shape of the pulled corrugated pipe is stretched. However, in any configuration of the superconducting cable, the tubular member 2 and the long member 3 are lighter and more flexible than the superconducting cable, and therefore the tension member can be simplified or omitted.

≪2. Separated room-temperature insulated superconducting cable-Part 2 >>
As shown in FIG. 3 (B), a separate room temperature insulated superconducting cable 101 shown in FIG. 3 (A) includes a separately manufactured low-temperature conductive portion 30 and a pipe that houses the low-temperature conductive portion 30 therein. It is formed by combining the room-temperature coating | coated part 20 in the installation site. This point is common to the superconducting cable 100 described with reference to FIG. The superconducting cable 101 in FIG. 3 differs from the superconducting cable 100 in FIG. 2 in that the position where the shunt conductor 22 is provided is the room temperature coating portion 20 in the superconducting cable 100 in FIG. Then, it is the low temperature conductive part 30. When the room-temperature insulated superconducting cable 101 having such a configuration is used, the superconducting cable 100 is laid according to the procedure shown in FIG. 1 with the room-temperature covering portion 20 as the tubular member 2 and the low-temperature conductive portion 30 as the long member 3. Hereinafter, each configuration of the room temperature insulated superconducting cable 101 will be described in detail.

{Low-temperature conductive part}
The low temperature conductive part 30 in FIG. 3 includes a conductor part 10 and a heat insulating tube 13 ′ with a shunt conductor. The heat insulating tube 13 ′ with the diversion conductor can be produced by forming the diversion conductor 22 on the outer periphery of the heat insulation tube 13.

{Room temperature coating}
The room temperature coating portion 20 of FIG. 3 can be produced by forming a room temperature side electrical insulating layer 23 on the outer periphery of the pipe-like structure 21.

≪3. Partially integrated room-temperature insulated superconducting cable >>
As shown in FIG. 4B, a partially integrated room-temperature insulated superconducting cable 200 shown in FIG. 4A includes a conductor part 10 manufactured individually and a pipe that accommodates the conductor part 10 therein. It forms by combining the heat insulation pipe | tube 40 with a covering part at a construction site. When the room-temperature insulated superconducting cable 200 having such a configuration is used, the room-temperature insulated superconducting cable 200 is installed according to the procedure shown in FIG. To do. Hereinafter, each configuration of the superconducting cable 200 will be described in detail.

{Conductor}
The configuration of the conductor portion 10 is the same as that of the conductor portion 10 in the separated room temperature insulated superconducting cable 100 described with reference to FIG. That is, the conductor portion 10 includes the former 11 and the superconducting conductor layer 12. Further, a protective layer (not shown) having a predetermined insulating characteristic and protecting the superconducting conductor layer 12 from friction or the like may be provided on the outer periphery of the conductor portion 10.

{Insulated pipe with cover}
As shown in FIG. 4B, the heat insulating tube 40 with the covering portion is a member in which the room temperature covering portion 20 is integrated with the outer periphery of the heat insulating tube 13. In order to produce the heat insulating tube 40 with the covering portion, first, the heat insulating tube 13 is prepared, and the shunt conductor 22 is formed on the outer periphery thereof. The outer periphery of the shunt conductor 22 is preferably covered with an insulating resin by, for example, extrusion to form the room temperature side electric insulation layer 23.

<< 4. Low-temperature insulated superconducting cable >>
As shown in FIG. 5 (B), the low-temperature insulated superconducting cable 300 shown in FIG. 5 (A) includes individually manufactured cable cores 50 and a heat insulating tube 13 that houses the cable cores 50 therein. It is formed by combining at the laying site. When the low-temperature insulated superconducting cable 300 having such a configuration is used, the low-temperature insulated superconducting cable 300 is laid according to the procedure shown in FIG. 1 with the heat insulating tube 13 as the tubular member 2 and the cable core 50 as the long member 3. Hereinafter, each configuration of the superconducting cable 300 will be described in detail.

{Cable core}
The cable core 50 has a configuration in which a superconducting conductor layer 12, an electrical insulating layer 16, an outer superconducting conductor layer (or outer shielding layer) 17, and a protective layer 18 are sequentially provided on the former 11. Among these 11-18, the electric insulation layer 16 is a layer which plays the role similar to the normal temperature side electric insulation layer 23 in the normal temperature insulation superconducting cables 100 and 200 mentioned above. However, unlike the normal temperature side electrical insulation layer 23, the electrical insulation layer 16 is cooled to a cryogenic temperature together with the superconducting conductor layer 12 in a heat insulating tube 13 described later.

  When the outer superconducting conductor layer (or outer shielding layer) 17 provided in the cable core 50 is composed of a superconducting conductor, the AC cable functions as an electromagnetic shield, and the DC cable functions as a return current conductor. Further, the protective layer 18 has a predetermined insulating characteristic and mechanically protects the outer superconducting conductor layer (or outer shielding layer) 17. By configuring the outermost portion of the protective layer 18 with a material having a low friction coefficient, the cable core 50 can be easily drawn into the heat insulating tube 13.

{Insulated pipe}
The heat insulating tube 13 in the low-temperature insulated superconducting cable 300 includes an inner tube 14 and an outer tube 15, similarly to the heat insulating tube in the room temperature insulated superconducting cable. It is preferable to form an anticorrosion layer (not shown) having a predetermined insulating property and protecting the outer tube 15 from impact and corrosion on the outer periphery of the outer tube 15.

<Embodiment 2>
In the first embodiment, the length of the tubular member laid in the pipe line and the length of the long member are approximately 1: 1. On the other hand, in this Embodiment 2, the number of elongate members was reduced compared with the number of tubular members by making the length of an elongate member longer than the length of the tubular member which continues in series. A method for laying the superconducting cable of the present invention will be described with reference to FIG.

  In this embodiment, for example, one long member 3 is used for every two tubular members 2. In that case, as shown to FIG. 6 (A), the several tubular member 2 is first inserted from the opening part of the manhole 9, and it is set as the state with which the several tubular member 2 continues in the pipe line 8. FIG. Here, since the outer diameter of the long member 3 is smaller than the inner diameter of the tubular member 2, the length (transport length) of the long member 3 that can be wound around one drum is longer than that of the tubular member 2.

  Next, as shown in FIG. 6B, the long member 3 is inserted into every other tubular member 2. At that time, the drawing wire is passed through the two tubular members 2 at once, the long member 3 is connected in series to the drawing wire, and the drawing wire is pulled. By doing so, the elongate member 3 is arrange | positioned so that the two tubular members 2 may be penetrated, as shown in FIG.6 (C). Thereafter, similar to the first embodiment, the long members 3 facing each other in the pipe line 8 are connected to each other, and the tubular members 2 are connected to each other to construct a superconducting cable line.

  According to the configuration of the second embodiment described above, the number of installations of the long members 3 can be reduced as compared to the configuration of the first embodiment, and the number of times of connecting the long members 3 can also be reduced. A cable track can be constructed.

  The embodiment of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention. For example, the laying place of the superconducting cable may be a place other than a pipe line such as outdoors. In addition, in the second embodiment, the ratio of the number of tubular members to the number of long members is 2: 1, but may be larger (for example, 3: 1, 4: 1).

  The laying method of the superconducting cable of the present invention can be suitably used for forming a large current transmission network.

DESCRIPTION OF SYMBOLS 1 Superconducting cable 2 Tubular member 3 Long member 8 Pipe line 9 Manhole 100, 101, 200 Room temperature insulation superconducting cable 10 Conductor part 30 Low temperature conductive part 11 Former 12 Superconducting conductor layer 13 Heat insulation pipe 14 Inner pipe 15 Outer pipe 131 Refrigerant 13 ′ Heat insulation pipe with shunt conductor 20 Room temperature covering part 21 Pipe-shaped structure 22 Current shunt conductor 23 Room temperature side electric insulation layer 40 Heat insulation pipe with covering part 300 Low temperature insulation superconducting cable 50 Cable core 16 Electric insulation layer 17 Outer superconducting conductor layer 18 Protection layer

Claims (7)

A superconducting cable laying method comprising a superconducting conductor layer and an electrical insulating layer,
A process α for preparing a tubular member and a long member to be the superconducting cable by combining them individually at the laying site;
Step β for laying the tubular member on a laying site;
Step γ for inserting the elongated member into the tubular member laid in step β;
Equipped with a,
A superconducting cable laying method in which a length of the long member is longer than a length of a plurality of continuous tubular members. The superconducting cable is
A conductor part formed by forming the superconducting conductor layer on the outer periphery of the former, and a low-temperature conductive part having a heat insulating tube for storing the conductor part therein and maintaining the conductor part at a cryogenic temperature;
A room temperature coating portion having the electrical insulating layer disposed so as to surround the outer periphery of the heat insulating tube;
  The method for laying a superconducting cable according to claim 1, wherein the superconducting cable is a room temperature insulated superconducting cable. The tubular member laid in the step β is composed of a heat insulating tube with a covering portion integrally formed with the room temperature covering portion on the outer periphery of the heat insulating tube,
The superconducting cable laying method according to claim 2, wherein the long member inserted into the tubular member in the step γ includes the conductor portion. A superconducting cable laying method comprising a superconducting conductor layer and an electrical insulating layer,
A process α for preparing a tubular member and a long member to be the superconducting cable by combining them individually at the laying site;
Step β for laying the tubular member on a laying site;
A step γ for inserting the elongated member into the tubular member laid in the step β;
With
The elongate member is longer than the tubular member,
The superconducting cable is
A conductor part formed by forming the superconducting conductor layer on the outer periphery of the former, and a low-temperature conductive part having a heat insulating tube for storing the conductor part therein and maintaining the conductor part at a cryogenic temperature;
A room temperature coating portion having the electrical insulating layer disposed so as to surround the outer periphery of the heat insulating tube;
A room temperature insulated superconducting cable with
The tubular member laid in the step β consists of the room temperature coating portion,
The long member inserted into the tubular member in the step γ is a method for laying a superconducting cable including the low temperature conductive portion. The room temperature coating portion further includes a shunt conductor,
The superconducting cable laying method according to claim 4, wherein the shunt conductor is formed inside the electrical insulating layer in the normal temperature coating portion and shares the current during the abnormality. The low-temperature conductive part further includes a shunt conductor,
The superconducting cable laying method according to claim 4, wherein the shunt conductor is formed outside the heat insulating tube in the low-temperature conductive portion, and shares an abnormal current. A superconducting cable laying method comprising a superconducting conductor layer and an electrical insulating layer,
A process α for preparing a tubular member and a long member to be the superconducting cable by combining them individually at the laying site;
Step β for laying the tubular member on a laying site;
Step γ for inserting the elongated member into the tubular member laid in step β;
With
The elongate member is longer than the tubular member,
The superconducting cable is
A conductor part formed by forming the superconducting conductor layer on the outer periphery of the former, and a low-temperature conductive part having a heat insulating tube for storing the conductor part therein and maintaining the conductor part at a cryogenic temperature;
A room temperature coating portion having the electrical insulating layer disposed so as to surround the outer periphery of the heat insulating tube;
A room temperature insulated superconducting cable with
The tubular member laid in the step β is composed of a heat insulating tube with a covering portion integrally formed with the room temperature covering portion on the outer periphery of the heat insulating tube,
The long member inserted into the tubular member in the step γ consists of the conductor portion,
  The insulated pipe with a covering portion further includes a shunt conductor,
This shunt conductor is formed outside the heat insulation pipe in the heat insulation pipe with the covering portion, inside the electric insulation layer, and laying a superconducting cable for sharing an abnormal current.

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