JP7240354B2 - Static induction device - Google Patents

Description

The present invention relates to static induction devices such as transformers and reactors, and more particularly to static induction devices having tap lines for adjusting voltage.

Generally, a coil for a transformer consists of a winding frame, a low-voltage coil made of a sheet-shaped low-voltage conductor and an insulator wound around the winding frame, and a rectangular high-voltage coil wound around the low-voltage coil. It consists of a high-voltage coil made of a conductor and an insulator.

In the manufacture of the above-described coil, the winding processing work of winding the conductor in the axial direction of the bobbin and the insulation processing work of winding the insulator on the step between the conductors are carried out. Furthermore, it is necessary to connect a tap line to the high-voltage coil to adjust the voltage according to the number of turns, and in addition to the above processing work, the work of connecting and drawing out the tap line is required.

For example, in Japanese Patent Application Laid-Open No. 2014-160786 (Patent Document 1), in order to make it easier to connect the tap wire, the straight part of the long side of the coil cross section is not bent along the outer periphery, but is extended as it is. shows a configuration in which it projects in the radial direction of the coil from the conductor portion on the outermost periphery of the stage.

JP 2014-160786 A

By the way, a conventional tap wire employs a configuration in which the tap wire is overlapped with a high-voltage conductor forming a high-voltage coil and electrically connected. Therefore, part of the high-voltage conductor is bent outward twice in the radial direction with respect to the axis of the bobbin to form a bent portion, and the tap wire is arranged in the bent portion formed in the high-voltage conductor. to electrically connect the tap line and the high-voltage conductor.

However, since the high-voltage conductor is bent in the radial direction to form a bent portion, the radial dimension of the coil increases by the thickness of the tap wire at the connecting portion between the tap wire and the high-voltage conductor. There is a problem that the size of the Incidentally, in Patent Document 1 as well, since the connecting portion of the tap wire is arranged on the outer periphery of the coil, there is a problem that the coil becomes large.

Separately from this, the connection between the tap wire and the high-voltage conductor is electrically insulated. There is a problem that the insulation of the connecting portion of the conductor is easily broken.

A main object of the present invention is to provide a stationary induction device capable of suppressing at least an increase in the radial dimension of the connecting portion between the tap wire and the high-voltage conductor.

A feature of the present invention is that, at the connecting portion between the tap wire and the high-voltage conductor, a recess is formed from the surface of the high-voltage conductor toward the inside to accommodate all or part of the tap wire. A tap line is placed in the recess and the tap line and the high-voltage conductor are electrically connected.

According to the present invention, since the tap wire is housed inside the high-voltage conductor and electrically connected to the high-voltage conductor, an increase in the radial dimension of the connecting portion between the tap wire and the high-voltage conductor is suppressed. can do.

1 is an external perspective view showing the configuration of a transformer to which the present invention is applied; FIG. FIG. 4 is a perspective view showing a connecting portion between a high-voltage conductor and a tap wire forming a coil of a transformer according to an embodiment of the present invention; 2B is a cross-sectional view showing a cross section of a connection portion between a high-voltage conductor and a tap wire forming the coil shown in FIG. 2A; FIG. FIG. 10 is a perspective view showing a connecting portion between a high-voltage conductor and a tap wire that form a coil of a conventional transformer; 3B is a cross-sectional view showing a cross section of a connection portion between a high-voltage conductor and a tap wire forming the coil shown in FIG. 3A; FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and applications can be made within the technical concept of the present invention. is also included in the scope.

Prior to explaining the present invention, a conventional connection structure between a tap wire and a high-voltage conductor of a coil will be explained, and then embodiments of the present invention will be explained.

FIG. 1 shows the appearance of an oil-filled transformer coil to which the present invention is applied. A coil 10 for an oil-filled transformer includes at least a winding frame 11, a low-voltage coil 12 made of a low-voltage conductor wound around the winding frame 11, and a high-voltage coil wound around the low-voltage coil 12. 13. The high-voltage coil 13 is formed by spirally winding a high-voltage conductor 14 in the axial direction of the coil 10 (the axial direction of the bobbin 11 ) and laminating a plurality of layers in the radial direction of the coil 10 .

The tap wire 15 is connected to the high voltage conductor 14 by the prescribed number of turns of the high voltage coil 13 , and the subsequent high voltage conductor 14 is wound on the tap wire 15 . Incidentally, a plurality of tap lines 15 are generally provided.

The connection between the tap line 15 and the high-voltage conductor 14 is conventionally constructed as shown in FIGS. 3A and 3B. 3A and 3B, the high-voltage conductor 34 of the high-voltage coil 13 (see FIG. 1) is connected to the tap line 35 at the position where the required voltage is obtained. A bent portion 36 projecting outward in the radial direction with respect to the axis of the winding frame 11 is formed in a partial region of the high-voltage conductor 34 .

As shown in FIG. 3B, the bent portions 36 include a first bent portion 36A in which the high voltage conductor 34 is bent radially outward, and a first bent portion 36A in which the high voltage conductor 34 is also bent radially outward. and a protruding portion 36C connecting the first bent portion 36A and the second bent portion 36B.

A tap wire 35 is arranged and electrically connected to a recess formed by the first bent portion 36A, the second bent portion 36B, and the projecting portion 36C. The tap wire 35 and the high-voltage conductor 34 are electrically connected by welding or brazing.

However, since the high-voltage conductor 14 of the high-voltage coil 13 is bent in the radial direction to form the bent portion 36, the radial dimension of the coil 10 at the connection portion between the tap wire 35 and the high-voltage conductor 14 is the same as that of the tap wire. There is a problem that the coil 10 is increased in size by the thickness of 35, thereby increasing the size of the coil 10 in the radial direction.

Separately from this, the connection between the tap wire 35 and the high-voltage conductor 34 is electrically insulated, but the other high-voltage conductor 34 wound on the outer layer from the connection between the tap wire 35 and the high-voltage conductor 34 is applied. Therefore, there is a problem that the insulation of the connecting portion between the tap wire 35 and the high-voltage conductor 34 is easily broken.

In order to solve such problems, in the embodiment of the present invention, at the connection portion between the tap line and the high-voltage conductor, all or part of the tap line is extended from the surface of the high-voltage conductor toward the inside. This proposal proposes a configuration in which a housing recess having a size capable of being housed is formed, a tap wire is arranged in the housing recess, and the tap wire and the high-voltage conductor are electrically connected.

According to this configuration, since the tap wire is housed inside the high-voltage conductor and electrically connected to the high-voltage conductor, an increase in the radial dimension of the connecting portion between the tap wire and the high-voltage conductor is suppressed. can do.

A specific configuration of the present embodiment will be described in detail below with reference to FIGS. 2A and 2B. 2A and 2B correspond to FIGS. 3A and 3B.

2A and 2B, the high voltage conductor 24 of the high voltage coil 13 (see FIG. 1) is connected to a tap line 25 at a position where the required voltage is obtained. In a partial area of the high-voltage conductor 24, a recessed portion 26 is formed which is sized to accommodate the tap wire 25. As shown in FIG.

As shown in FIG. 2B, the housing recess 26 is formed from the inner peripheral side in the radial direction of the high-voltage conductor 24, that is, from the surface of the winding frame 11 side toward the inner side (outside in the radial direction). . That is, the high-voltage conductor 24 is cut inward from the surface of the high-voltage conductor 24 and parallel to the axis of the bobbin 11 . The storage recess 26 can be formed by pressing or cutting.

Further, the storage recess 26 is formed to have a size that can store all or part of the tap wire 25 . Specifically, the depth (D) of the housing recess 26 is preferably longer than the thickness (Tt) of the tap wire 25 and shorter than the thickness (Tc) of the high-voltage conductor 24 . In this embodiment, the depth D is set to approximately 1/2 to 1/3 of the thickness (Tc) of the high-voltage conductor 24 . Furthermore, the width (Lc) of the housing recess 26 in the longitudinal direction of the high-voltage conductor 24 is formed longer than the width (Lt) of the tap line 25 .

As a result, the tap wire 25 can be accommodated in the accommodation recess 26 without bending the high-voltage conductor 24 as in the conventional case, and the tap wire 25 and the high-voltage conductor 24 are electrically connected in this accommodated state. In particular, in the present embodiment, if the inner peripheral surface of the high voltage conductor 24 and the inner peripheral surface of the tap wire 25 are flush with each other, the thickness of the connecting portion between the high voltage conductor 24 and the tap wire 25 is The thickness is the same as the thickness of the high voltage conductor 24 . The tap wire 25 may be wholly housed in the housing recess 26 of the high-voltage conductor 24, or part of the tap wire 25 may be housed in the housing recess 26 of the high-voltage conductor 24. It can also be configured to be retracted.

Here, the tap wire 25 and the high-voltage conductor 24 can be electrically connected by an appropriate welding method depending on their respective materials. For example, if both the tap wire 25 and the high voltage conductor 24 are made of copper, the connection can be made by TIG welding. If the tap wire 25 is made of copper and the high-voltage conductor 24 is made of aluminum, the connection can be made by resistance welding, preferably upset welding.

According to this embodiment, it is possible to suppress an increase in the radial dimension of the coil 10 by the thickness of the tap wire 25 at the connection portion between the tap wire 25 and the high-voltage conductor 24. 1, the coil 10 does not increase in size in the radial direction.

In addition, the connecting portion between the tap wire 25 and the high-voltage conductor 24 is electrically insulated, but since the connecting portion between the tap wire 25 and the high-voltage conductor 24 does not protrude outward in the radial direction, it is wound outward. The high-voltage conductor 24 prevents breakdown of the insulation at the connecting portion between the tap wire 25 and the high-voltage conductor 24 .

In the above-described embodiment, the tap wire 25 is housed in the housing recess 26 formed on the inner peripheral side of the high-voltage conductor 24 (the winding frame 11 side). A storage recess 26 may be formed on the surface opposite to the frame 11 to store the tap wire 25 therein. Furthermore, a configuration may be adopted in which a housing recess 26 is hollowed out in the interior of the high-voltage conductor 14 in a direction parallel to the axis of the bobbin 11 and the tap wire 25 is inserted into the housing recess 26 .

According to these embodiments as well, it is possible to suppress an increase in the radial dimension of the coil 10 by the thickness of the tap wire 25 at the connection portion between the tap wire 25 and the high-voltage conductor 24, which is different from the conventional configuration. In comparison, the coil 10 does not increase in size in the radial direction.

In addition, the connection between the tap wire 25 and the high-voltage conductor 24 is electrically insulated, but since the connection between the tap wire 25 and the high-voltage conductor 24 does not protrude outward in the radial direction, it is wound outward. The high-voltage conductor 24 prevents breakdown of the insulation at the connecting portion between the tap wire 25 and the high-voltage conductor 24 .

It should be noted that the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. In addition, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Moreover, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

DESCRIPTION OF SYMBOLS 10... Coil, 11... Winding frame, 12... Low voltage side coil, 13... High voltage side coil, 14, 24, 34... High voltage conductor, 15, 25, 35... Tap wire.

Claims (6)

At least, a winding frame, a low-voltage coil made of a low-voltage conductor wound around the winding frame, a high-voltage coil made of a high-voltage conductor wound around the low-voltage coil, and a high-voltage coil. A stationary induction device comprising a tap wire connected to the high voltage conductor with a specified number of turns,
The connection portion between the tap wire and the high-voltage conductor is formed with a recess having a size capable of storing all or part of the tap wire from the surface of the high-voltage conductor toward the inside. A stationary induction device, wherein the tap line is arranged and the tap line and the high-voltage conductor are electrically connected to each other. The stationary induction device according to claim 1,
A stationary induction device, wherein the housing recess for housing the tap wire is formed on the surface of the high-voltage conductor on the winding frame side. The stationary induction device according to claim 1,
A static induction device, wherein the housing recess for housing the tap wire is formed on the surface of the high-voltage conductor on the side opposite to the bobbin. The stationary induction device according to claim 1,
A stationary induction device, wherein the housing recess for housing the tap wire is formed inside the high-voltage conductor in a direction parallel to the axis of the bobbin. The stationary induction device according to claim 2,
A stationary induction device, wherein a surface of the high-voltage conductor on the winding frame side and a surface of the tap wire on the winding frame side are flush with each other. The stationary induction device according to any one of claims 1 to 5,
the connection portion between the tap wire and the high-voltage conductor is a connection portion made of the tap wire TIG-welded to the high-voltage conductor when both the tap wire and the high-voltage conductor are made of copper;
When the tap wire is made of copper and the high voltage conductor is made of aluminum, the connecting portion between the tap wire and the high voltage conductor is made of the tap wire resistance-welded to the high voltage conductor. A stationary induction device characterized by being a part.

Images