JPH01207911A - Superconducting transformer - Google Patents

Abstract

PURPOSE:To reduce the number of leads from low-temperature part to room- temperature part and to reduce amount of heat entering the low-temperature part through the leads by connecting insulating containers at their lower parts and by connecting each coil body at this connecting part. CONSTITUTION:A plurality of coil bodies 15-17 for storing coil wound by a superconductive material into an insulating container 21 are provided, the insulating containers 21 are connected at the lower part of the insulating container 21, and each of coil bodies 15-17 is connected at this connecting part 23. It allows each coil body 15-17 to be connected at the connecting part of the insulating container 21, namely within insulation, thus reducing the number of leads from the insulating part to the room-temperature part and hence drastically reducing the amount of heat entering from these leads through conduction.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a superconducting transformer.

[Conventional technology]

Figures 3 to 5 are taken from publications such as "Fuji Jiho" Vol. 3.
6, No, 7.1963, p528-p534
) is a diagram showing a conventional transformer shown in FIG.

Figure 3 is a cross-sectional view of one phase of a three-phase transformer, showing (2) double iron core, (3) E high voltage lead support insulator, (4) C high voltage terminal,
(5) C low voltage lead support insulator, (6) low voltage terminal, 1
7) i high voltage lead, (8) low voltage lead, (9) e high voltage coil, +10) i low voltage coil, (Ill U coil support material, j11 fl bed. Figure 4 shows the electrical connection of a three-phase transformer. For simplicity, only the high pressure side is shown. (+
3+i high voltage 3 phase connection lead, (14) high voltage 3 phase terminal,
(16) is a W-phase transformer, (16) is a V-phase transformer, (17)
This is a single U-phase transformer. Moreover, FIG. 5 is a partial sectional view of a three-phase transformer, and only the high voltage side is shown for the sake of simplicity. Qg) [In the case of a Y-connection with a high-pressure bushing, there are four points: U, V, W, and a neutral point N. (19) H cabinet, □□□) It is an electrically insulating layer for air, oil, etc.

Next, the operation will be explained. For example, if the transformer (1) is a core type, a low voltage coil (10) and a high voltage coil (9) are wound around an iron core (2), and from each coil a pair of low voltage leads (8), The high voltage lead (7) is pulled out, the low voltage lead support insulator (5), and the low voltage terminal (6)
and is connected to a high voltage lead support insulator (3) and a high voltage terminal (4). Coil support material (+1) i Fixes each coil and iron core (2) and supports bed Q211d iron core 12). 3 phase transformer vs. above transformer 11)
As shown in Fig. 5, U, V, W phase transformer (1 powder, (1
6), (15) and 3 units are installed, and high-voltage 3-phase connection leads (13JK) are used to connect 3-phase connections using electrical insulating layers in the upper space, etc., and high-voltage 3-phase terminals for each phase (1 ship, high-voltage bushings) are installed. (+8) to the outside of the cabinet (+9).The connection on the low voltage side is also the same.In other words, the leads of the transformer (15), Qe!, and Qη of each phase are connected to the high voltage lead (7). ) and two low voltage leads (8), for a total of four.

[Problem to be solved by the invention]

A conventional three-phase transformer is configured as described above. However, in the case of a superconducting transformer, the wires of the high-voltage coil (9) and low-voltage coil (10) are made of a superconductor, and in order to maintain the superconducting state, each coil is stored at an extremely low temperature such as liquid helium or liquid nitrogen in a cold container. The ultra-low temperature section and the external normal temperature section are connected by high pressure leads (7) and low pressure leads (8). On the other hand, since these leads are made of good electrical and thermal conductors such as copper and aluminum, there is a large amount of heat intrusion from normal temperature areas to ultra-low temperature areas due to conduction, and a large amount of expensive coolant evaporates, resulting in high operating costs. Rarely.

This invention was made to solve the above-mentioned problems, and aims to provide a superconducting transformer with low operating costs by reducing heat intrusion into the ultra-low temperature section by conduction.

[Means to solve the problem]

The superconducting transformer according to the present invention includes a plurality of coil bodies in which coils wound with superconducting material are stored in cold containers, and the cold containers are communicated with each other below the cold containers, and each of the above-mentioned It is designed to connect coil bodies.

[Effect]

Since each coil body is connected to the superconducting transformer of this invention in the continuous part of the cold storage container, that is, in the cold storage, the number of leads drawn out from the cold storage part to the room temperature part is reduced, and heat intrusion through conduction from these leads is reduced. The amount decreases drastically.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a sectional view showing the configuration of the main parts of a superconducting transformer according to an embodiment of the present invention. It is a communication part, that is, a low-temperature connection box, that connects the cold storage containers with each other below the container @υ.

In this example, one coil body θ6), θB+, Q7) is equipped with a high voltage coil (9) and a low voltage coil 00)k, with W and V, respectively.

It constitutes a U-phase transformer.

The electrical and magnetic configuration as a three-phase transformer is the same as the conventional device. Although they are different, the wires of the high-voltage coil (9) and the low-voltage coil (lO) are made of superconductors such as NbTi or Nb3Sn, and these coils are
) and is cooled with a coolant such as liquid nitrogen or liquid helium. Further, the iron core (2) can be configured as a transformer even if it is installed inside the same cold container as the coil or in a room temperature area outside the cold container. U-phase transformer (1η.

A low-temperature junction box connecting each phase is provided at the bottom of the V-phase transformer f161 and the W-phase transformer (each country's cold storage container 1). ) is carried out. The superconducting wire used for this connection lead Q31H coil is used. With this configuration, the number of leads drawn out from the refrigerated ultra-low temperature section to the normal temperature section is halved.

FIG. 2 is a cross-sectional view showing the structure of the main parts of a superconducting transformer according to another embodiment of the present invention, and in the figure, the ring represents a superconducting cable. As in this example, when connecting a superconducting transformer and a superconducting cable (2), all three-phase connections and external leads can be treated in an ultra-low temperature section.
Prevents heat from entering from the room temperature area through the leads.

In the above embodiments, an example of an inner iron type transformer is shown, but the present invention is also applicable to an outer iron type transformer.

In addition, in the above embodiment, a case was explained in which a three-phase transformer having three coil bodies was connected to three phases by a Y connection.
A Δ connection may be used, and the present invention can also be applied to a case where a 6-phase transformer is connected to 6 phases, and the same effects as in the above embodiment can be obtained.

Furthermore, in the above embodiment, a case has been described in which the high voltage coil (9) and the low voltage coil (lO) are housed in one cold storage container (21) to form one coil body. The coil body may be constructed by accommodating only the above-described components, and in this case, the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of coil bodies are provided in which coils wound with a superconducting material are housed in a cold insulating container, and the cold insulating containers are communicated with each other below the cold insulating container. Since each coil body was connected,
The number of leads pulled out from the low-temperature part to the room-temperature part is reduced, and the amount of heat that passes through the leads and enters the low-temperature part is greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the configuration of the main parts of a superconducting transformer according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the structure of the main parts of a superconducting transformer according to another embodiment of the invention, Figure 3 is a cross-sectional view showing one phase of a conventional transformer, Figure 4 is an explanatory diagram showing the electrical connection of a conventional three-phase transformer, and Figure 5 is a cross-sectional view showing the configuration of a conventional three-phase transformer. It is a diagram. In the figure, (2) is the iron core, +91i high voltage coil, (1
01U low voltage coil, (13) [3-phase connection lead, θ4)
D 3-phase terminal, (1n to θη are coil bodies, (211U cold insulating container, or a significant portion thereof.

Claims (1)

[Claims] A superconductor comprising a plurality of coil bodies in which coils wound with superconducting material are housed in cold containers, the cold containers are communicated with each other below the cold containers, and each of the coil bodies is connected at this communication section. transformer.