JP2009283583A - Static superconducting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a static superconducting device to be installed outdoors, of which the storage vessel is improved so as to reduce the equipment cost and improve maintainability of the device. <P>SOLUTION: The static superconducting device having windings 2 and 3 of superconducting wires wound around an iron core 1 includes: an electrically and thermally insulated hermetic vessel 4 wherein the windings and a liquid coolant 5 for cooling the windings to a very low temperature are stored apart from the iron core 1; and a weather-resistant metallic vessel 8 wherein the thermally insulated vessel 4 and the iron core 1 are stored. An outside air inlet port 8a and an exhaust port 8b are opened in the metallic vessel 8 as ventilation ports for air introduction, and a space in the metallic vessel is opened to the atmosphere side through the ventilation ports to cool the iron core 1 by natural convection of outside air. The metallic vessel 8 includes a through bushing 6, and a hermetic wiring duct 9 is disposed between the through bushing and the thermally insulated vessel 4 having the windings stored therein to prevent leakage of cooling gas and then the through bushing and the windings are connected through the wiring duct by a current lead 7 made of a normally conducting conductor like copper. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stationary superconducting device installed outdoors for superconducting transformers, superconducting reactors, and the like, and more particularly to a containment container for superconducting devices.

  In recent years, research and development of stationary superconducting equipment such as superconducting transformers using superconducting technology has been underway. In particular, yttrium-based (Y-based) and holmium-based (Ho-based) oxide high-temperature superconducting wires can use liquid nitrogen as a cooling refrigerant. It has become like this.

  Next, FIG. 3 shows a conventional basic structure that is being developed by taking a superconducting transformer as an example (see, for example, Patent Document 1). In FIG. 3, 1 is an iron core, 2 and 3 are primary windings and secondary windings wound around the central leg of the iron core 1 using the oxide high temperature superconducting wire as a strand, and 4 is isolated from the iron core 1. Then, a sealed heat insulating container (cryostat) containing the windings 2 and 3 and a liquid refrigerant (liquid nitrogen) 5 for cooling the windings, 6 is a bushing, 7 is drawn from the winding 2 and connected to the bushing 6 Current lead. The heat insulating container 4 is a hollow container comprising an inner cylinder 4a, an outer cylinder 4b, a top plate 4c, and a bottom plate 4b for allowing the legs of the iron core 1 to pass through, and the material thereof is a fiber reinforced plastic that is not electromagnetically affected. It is comprised with the vacuum vessel made from (GFRP) (for example, refer nonpatent literature 1). In the drawing, a cooling device for replenishing the liquid refrigerant 5 accommodated in the heat insulating container 4 is omitted.

  The above-mentioned superconducting transformer is a small-capacity superconducting device developed for indoor use, and is usually installed indoors. The heating value of the iron core 1 due to iron loss is far greater than the heating value of the windings. Therefore, the iron core can be operated without any trouble even if it is self-cooling.

On the other hand, the main body of the superconducting transformer configured as described above is housed in a sealed tank (metal container), nitrogen gas is sealed in the space inside the tank, and the core is cooled in a layer of an iron core (a laminate of silicon steel plates). There is also known a superconducting transformer of a double structure container in which a panel is provided and an inert liquid refrigerant is sent to the cooling panel from the outside of the tank to cool the iron core (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 2002-217022 Hiroki Uenoshino, Hiroshi Tsuji, “Development of Superconducting Main Transformer for Railway Vehicles”, [online], [Search April 20, 2008], Internet <URL: HYPERLINK “http: //www.rtri.or. jp / infoce / rrr / 2007/12/200712 # 06.pdf "http://www.rtri.or.jp/infoce/rrr/2007/12/200712#06.pdf> JP-A-2-296309

  Recently, research and development of superconductivity has also been promoted for large-capacity power transformers. In this case, superconducting transformers for power are large, so the plan assumes installation outdoors. .

  In this case, if the superconducting transformer having the configuration shown in FIG. 3 is installed outdoors and left exposed to the atmosphere for a long time, the material deteriorates due to the influence of direct sunlight on the GFRP heat insulating container. The strength of the container may be reduced. Accordingly, in order to protect the deterioration of the insulated container containing the windings and the refrigerant, the entire transformer including the iron core is stored in a weather-resistant metal container in the same manner as the configuration disclosed in Patent Document 2 described above. There is a need.

  By the way, in the structure disclosed in Patent Document 2, the outside tank is hermetically sealed and nitrogen gas is enclosed therein, so that a cooling device dedicated to the iron core is required. The refrigerant piping that feeds refrigerant from the outside to the cooling panel inside the iron core and the refrigerant piping that sends the refrigerant from the refrigerator installed outside the tank to the heat insulation container also depends on the outdoor installation conditions. The following measures are required.

  In other words, there is a temperature difference between the outer tank (metal) that is directly affected by the outside air temperature, sunlight, etc., and the heat insulating container (cryostat) placed inside the tank. Since the thermal expansion coefficient differs between the heat insulating material and the heat insulating material, a relative displacement occurs between the tank and the heat insulating container due to a change in the ambient outside air temperature. Therefore, in order to ensure the airtightness of the location where each of the refrigerant pipes penetrates the tank, a means for escaping the relative displacement due to the thermal influence is necessary, and this complicates the pipe and seal structure. In addition, since nitrogen gas is sealed in a sealed tank, there is a problem in maintainability when an operator enters the tank to inspect the transformer.

  The present invention has been made in view of the above points, and its purpose is to solve the above-mentioned problems, reduce the equipment cost, and improve the maintainability of the equipment. To provide superconducting equipment.

  In order to achieve the above-mentioned object, according to the present invention, in a static superconducting device having a structure in which a winding of a superconducting wire is wound around an iron core, the winding and the winding are cooled to a cryogenic temperature in isolation from the iron core. And a weather-resistant metal container for storing the heat insulation container and the iron core. The metal container is provided with a ventilation opening for air conduction, and the ventilation opening. The space in the metal container is opened to the atmosphere side through (Claim 1).

  In addition, a blower blower is connected to the ventilation port, and the outside air is forcibly ventilated into the space in the metal container through the blower.

  Further, a through bushing is provided in the metal container, and an airtight wiring duct is disposed between the bushing and the heat insulating container containing the winding, and normal conduction is provided between the bushing and the winding through the wiring duct. They are connected by current leads of the material (claim 3).

  According to the superconducting transformer having the above configuration, the insulation container containing the superconducting winding and the liquid refrigerant is protected from direct sunlight exposure, and the metal container is hermetically sealed, even under outdoor conditions. By opening to the atmosphere side without taking the shape, the iron core can be cooled by the outside air introduced through the ventilation port and blower. Moreover, it is not necessary to secure the airtightness of the various pipes and bushings that penetrate the metal container to the outside, and it is possible to manufacture outdoor-installed superconducting equipment at low cost.

  By connecting the through bushing provided in the metal container and the heat insulating container containing the winding with an airtight wiring duct and connecting the bushing and the winding with a normal conductive lead through the wiring duct. The current leads can be wired by preventing leakage of the refrigerant gas contained in the heat insulating container.

  In addition, since the metal container is open to the atmosphere and nitrogen gas is not sealed in the internal space, maintenance personnel can enter the metal container as it is during maintenance and inspection of equipment. Maintainability is improved.

  Embodiments of the present invention will be described below based on the examples shown in FIGS. In addition, in each figure, the same code | symbol is attached | subjected to the member corresponding to FIG.

  In FIG. 1, in this embodiment, the entire superconducting transformer assembly including the iron core 1, the windings 2 and 3 and the heat insulating container 4 containing the liquid refrigerant 5 is housed in a metal container 8 and installed outdoors. . Here, the metal container 8 is provided with an outside air intake port 8a and an exhaust port 8b as ventilation openings, and the space in the container is opened to the atmosphere side through the ventilation openings. Further, a through bushing 6 is installed on the ceiling plate of the metal container 8, and the bushing 6 and the heat insulating container 4 are connected by an airtight wiring duct 9, and the windings 2, 3 are connected through the wiring duct 9. The bushing 6 is interconnected by a current lead of a normal conducting conductor such as copper.

  Although not shown, the iron core 1 is installed inside the metal container 8 via a base frame body, and the heat insulating container 4 is supported on the base frame body of the iron core 1 via a prevention rubber or the like. Moreover, the location where the bushing 6 penetrates the metal container 8 is sufficient with a seal structure that does not allow rainwater or the like to enter the container. Furthermore, a dust-proof filter 10 is attached to the outside air inlet 8a in the illustrated metal container 8 so as to prevent dust from entering. In addition, the metal container 8 is provided with a door that allows maintenance personnel to enter and exit as necessary.

  With the above configuration, the heat insulating container 4 is surrounded by the metal container 8 that is a storage container and is not directly exposed to direct sunlight, thereby preventing deterioration of the material of the heat insulating container 4. In addition, outside air naturally convects in the internal space of the metal container 8 through the outside air intake port 8a and the exhaust port 8b, and the iron core 1 is cooled by this outside air convection.

  Further, the metal container 8 is open to the atmosphere side, and maintenance personnel can directly enter the metal container 8 to perform maintenance work during maintenance inspection of the superconducting transformer.

  Next, an embodiment corresponding to claim 2 of the present invention is shown in FIG. That is, the amount of heat generated by the iron core 1 varies depending on the capacity of the transformer, etc., and there is a case where sufficient cooling capacity cannot be ensured by the natural air convection method of the first embodiment described above in a large capacity device. Therefore, in the second embodiment, the blower 11 is connected to the air intake port, and a large amount of outside air is forced through the blower 11 to cool the iron core 1.

  Although not illustrated in the illustrated embodiment, a rectifying plate is provided so that cooling air introduced through the blower 11 flows through the entire area of the iron core 1 as necessary. Further, the blower 11 may be installed outside the metal container 8 as shown in the figure, or may be installed inside the container, and the position and number of ventilation openings and the number of blowers 11 installed can be freely selected.

Schematic configuration diagram of a superconducting transformer corresponding to Embodiment 1 of the present invention Schematic configuration diagram of a superconducting transformer corresponding to Embodiment 2 of the present invention Basic schematic diagram of conventional superconducting transformer

Explanation of symbols

1 Iron core 2, 3 Superconducting winding 4 Thermal insulation container 5 Liquid refrigerant (liquid nitrogen)
6 Bushing 7 Current lead 8 Metal container 8a Outside air intake port 8b Exhaust port 9 Wiring duct 11 Blower

Claims (3)

  A stationary superconducting device having a structure in which a winding of a superconducting wire is wound around an iron core, which is isolated from the iron core and contains a winding and a liquid refrigerant that cools the winding to a cryogenic temperature. A container, and a weather-resistant metal container for storing the heat insulation container and the iron core. The metal container has a ventilation port for opening air, and the space in the metal container is opened to the atmosphere through the ventilation port. Static superconducting equipment characterized by   2. The stationary superconducting device according to claim 1, wherein a blower for blower is connected to the ventilation port, and the outside air is forcibly ventilated into the space in the metal container through the blower.   3. The stationary superconducting device according to claim 1, wherein a through bushing is provided in the metal container, and an airtight wiring duct is disposed between the bushing and the heat insulating container containing the winding. A stationary superconducting device characterized in that a bushing and a winding are connected by a current lead of a normal conducting material through the wiring duct.

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