JPH0831671A - Superconducting induction apparatus - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency of windings, simplify the structure of a cooling bath, and reduce the size of an iron core. CONSTITUTION:A wire of oxide high temperature superconductor is wound around an iron core 1 composed of amorphous thin bands. The resultant assembly is put in a cooling bath 4 containing liquid nitrogen 9. Since the winding is high temperature superconductor, it is possible to efficiently cool it using liquid nitrogen. Since the iron core 1 and the winding are placed in the same cooling bath 4, it is possible to simplify the structure of the bath 4 and reduce the size of the iron core 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to superconducting induction electromagnetic equipment.

[0002]

2. Description of the Related Art Among induction electromagnetic devices such as transformers and reactors, superconducting induction electromagnetic devices using a superconducting winding as a winding are known. Conventionally, a metal-based superconducting wire such as niobium-titanium is used for this superconducting winding, and only the winding portion is housed in a cooling tank and cooled with liquid helium. The iron core uses a silicon steel plate and is kept at room temperature.

FIG. 2 shows a superconducting transformer which is an example of the conventional structure. 1 is an iron core made of a silicon steel plate, 2 is a primary winding wound around the center leg of the iron core 1, and 3 is also a secondary winding. so,
Both windings 2 and 3 are made of a metallic superconducting wire such as niobium-titanium. Reference numeral 4 denotes a cooling tank, which is configured in a donut shape having a through hole 5 in the center.
The central leg of the iron core 1 is inserted into the. The windings 2 and 3 are housed inside the cooling tank 4. 6 is liquid helium stored in the cooling tank 4, 7 is a lead wire of the primary winding 2,
Reference numeral 8 is a lead wire of the secondary winding 3.

As can be understood from this configuration, conventionally, only the windings 2 and 3 are cooled by the cooling tank 4, and therefore, the cooling tank 4 is configured to accommodate only the windings 2 and 3. However, the structure is complicated because it is necessary to form the donut shape as described above. Further, since the cooling tank 4 is installed inside the window of the iron core 1, the iron core 1 inevitably becomes large. Further, when the iron core 1 generates heat, the heat causes the liquid helium 6 to be heated, so that the cooling efficiency deteriorates and in some cases, the liquid helium 6 evaporates.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to improve cooling efficiency, simplify the structure of a cooling tank, and downsize an iron core.

[0006]

According to the present invention, a winding wire made of an oxide type high temperature superconductor is wound around an iron core made of an amorphous ribbon, and the winding wire and the iron core are filled with liquid nitrogen. It is characterized by being stored in a cooling tank.

[0007]

[Function] Amorphous has an iron loss of 1 / th compared to silicon steel.
It is 3-1 / 4, which is extremely small, and therefore the amount of heat generated is small. Moreover, the cooling efficiency by liquid nitrogen is 50 times or more higher than the cooling efficiency by liquid helium. Therefore, if a winding made of an oxide-based superconductor is used and an amorphous iron core is used for cooling with liquid nitrogen, cooling energy consumption due to iron loss is reduced, and a highly efficient superconducting induction electromagnetic device can be obtained.

Liquid nitrogen has a higher liquefaction temperature than liquid helium. Further, since the winding is a high-temperature superconductor, even if the temperature becomes high, the liquid nitrogen can sufficiently cool it to become superconducting. By using the liquid nitrogen, the winding made of high-temperature superconductor, and the amorphous iron core in this way, it becomes possible to store them in a common cooling tank. There is no need to use anything, and the iron core can be prevented from increasing in size.

[0009]

Embodiment An embodiment of the present invention will be described with reference to FIG. In addition, the same reference numerals as those in FIG. 2 indicate the same or corresponding portions. According to the present invention, the iron core 1 is made of an amorphous ribbon. In addition, the primary winding 2 and the secondary winding 3
Is made of an oxide-based superconductor such as a ceramic superconductor. After winding the windings 2 and 3 around the center leg of the iron core 1, the iron core 1 and the windings 2 and 3 are both shared by the common cooling tank 4
To store. Liquid nitrogen 9 is placed in the cooling tank 4, and the two windings 2 and 3 are cooled by the liquid nitrogen 9 to such an extent that they exhibit a superconducting phenomenon.

Since the amorphous iron loss is small and the cooling efficiency of liquid nitrogen is high, an oxide superconductor is used for the winding.
By using amorphous iron for each core and cooling with liquid nitrogen, the consumption of cooling energy due to iron loss is small. Further, since the winding is a high-temperature superconductor, liquid nitrogen having a high liquefaction temperature can sufficiently cool the superconductor even in a high temperature state. Further, since the iron core itself is also cooled, the influence of the heat on the liquid nitrogen due to the heat is reduced, and the decrease in cooling efficiency is avoided accordingly.

Since only the windings 2 and 3 need to be housed in the window of the iron core 1 and there is no need to install a cooling tank as in the conventional case, the window can be made small and therefore the iron core 1 can be made small. The cooling tank 4 does not need to have a donut shape as in the conventional case, and has a simple shape.

[0012]

As described above, according to the present invention, the iron core is made of an amorphous material, and the winding is made of an oxide-based high temperature superconductor, and these are put in a common cooling tank and cooled by liquid nitrogen. As a result, it is possible to obtain an electromagnetic device having higher efficiency than the conventional configuration, and it is possible to reduce the size of the iron core and simplify the cooling tank.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional configuration.

[Explanation of symbols]

 1 Iron core 2 Primary winding 3 Secondary winding 4 Cooling tank 9 Liquid nitrogen

Claims (1)

[Claims] 1. A superconducting device in which a winding made of an oxide-based high-temperature superconductor is wound around an iron core made of an amorphous ribbon, and the winding and the iron core are housed in a cooling tank containing liquid nitrogen. Induction electromagnetic equipment.