JPS5843772Y2 - transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure of a transformer in which a low voltage winding terminal is drawn out to the outside through a low voltage lead terminal provided on a side wall of an outer box.

Generally, in transformers such as instrument transformers where the voltage on the high voltage side is very high, the high voltage winding is wound around the outer periphery of the low voltage winding that is wound around the iron core. A shield ring is installed around the high voltage winding to alleviate the electric field.

Then, the high voltage winding and the high voltage lead terminal are connected through the shield ring, and the high voltage lead terminal and the high voltage bus bar are connected.

On the other hand, the low voltage winding is connected to a low voltage lead terminal provided on the outer box, and the structure is such that the low voltage lead terminal and the meter are connected.

A conventional transformer has an iron core 8 as shown in Figures 1 and 2.
A low voltage winding 1 is connected to one leg of the
is wound, and a shield ring 12 is attached to the outer periphery of the high voltage winding 2.

The high voltage winding 2 is connected to a high voltage lead terminal 14 through a shield ring 12 and a high voltage connection conductor 13.

On the other hand, flat grounding shields 3 and 4 are provided facing the iron core 8 in order to alleviate the electric field at the ends of the iron core 8 and the iron core clamping member 9 facing the high voltage winding 2 and the shield ring 12. The shield 3 is arranged on the axial end side of the high voltage winding 2 and the low voltage winding 1.

The low voltage winding 1 is connected by a low voltage seed 6 to a low voltage lead terminal 7 provided on the outer box.

However, since the low voltage lead terminal connecting portion 11 and the low voltage lead terminal 7 are located at positions exposed from the ground shield plate 4, they directly face the shield ring 12, which is a high voltage charging portion.

When comparing the electrode shapes of the flat ground shield 4 and the low voltage lead terminal connection part 11, it is clear that the low voltage lead terminal connection part 11 is much worse. The insulation distance between the shield ring 12 and the ground shield 4 needs to be considerably larger than the insulation distance between the shield ring 12 and the ground shield 4, which has the disadvantage that the entire device becomes larger.

In addition, it is undesirable from the viewpoint of low voltage circuit protection that the low voltage lead terminal connecting portion 11 and the low voltage lead terminal 7 are exposed from the ground shield 4 and directly exposed to the high voltage charging part, and as shown in FIGS. 3 and 4. As shown, a structure is also adopted in which a protective shield 5 is provided to cover and protect the low-voltage outlet terminal connection part 11 and the low-voltage outlet terminal 7, but in this case, the protective shield 5 and the fastening member 1 to which it is attached are also provided.
6 is required, which has the disadvantage of causing an economic loss due to an increase in the number of parts and an increase in assembly time.

In addition, in both cases of Fig. 1 and Fig. 2, the installation position of the low-voltage outlet terminal 7 is limited to the lower part of the outer box 10, which has the disadvantage of causing a major hindrance in the arrangement of the equipment and the configuration with other equipment. Was.

The present invention was developed to solve the above-mentioned drawbacks of the conventional devices, and by providing the low voltage lead terminal in the area facing the ground shield on the side wall of the outer box, the low voltage lead part is completely protected from the high voltage charging part. The purpose of installing low-voltage lead terminals is to provide a transformer with greatly improved freedom of position.

An embodiment of the transformer according to the present invention will be described below with reference to FIGS. 5 and 6.

In the figure, like the conventional ones shown in FIGS. 1 and 2, a low voltage winding 1 is wound around one leg of the iron core 8, a high voltage winding 2 is wound around the outer periphery of the low voltage winding 1, and a high voltage winding 2 is further wound around the outer periphery of the low voltage winding 1. A shield ring 12 is attached to the outer periphery.

The high voltage winding 2 is connected to a high voltage lead terminal 14 through a shield ring 12 and a high voltage connection conductor 13.

On the other hand, flat grounding shields 3 and 4 are provided facing the iron core 8 to alleviate the electric field at the ends of the iron core 8 and the iron core clamping member 9, which face the high voltage winding 2 and the shield ring 12. The shield 3 is arranged on the axial end side of the high voltage winding 2 and the low voltage winding 1.

The low voltage lead terminal 7 is connected to the outer box 1 facing the grounding shield 3.
0 and is connected to the low voltage winding 1 by a low voltage lead 6.

Therefore, all parts of the low-voltage wiring circuit, such as the low-voltage lead 6, low-voltage lead terminal 7, and low-voltage lead-out terminal connection part 11, are completely protected by the ground shields 3 and 4 from the high-voltage winding 2 and the shield ring 12, which are high-voltage live parts. It turns out.

Furthermore, the mounting position of the low voltage lead terminal 7 can be freely selected within the range of the height of the ground shield 3.

As described above, according to the transformer of the present invention, by providing the low voltage lead terminal in the area facing the ground shield on the side wall of the outer box, the low voltage lead terminal is completely protected from the high voltage live part, and the low voltage lead terminal is Since the degree of freedom in mounting position is greatly improved, the practical effect is great.

[Brief explanation of drawings]

1 and 2 are a plan view and a side view, respectively, showing a schematic configuration of an example of a conventional transformer, and FIGS. 3 and 4 are plan views, respectively, showing a schematic configuration of another example of a conventional transformer. 5 and 6 are a plan view and a side view, respectively, showing the schematic structure of an embodiment of the transformer according to this invention. In the figure, 1 is a low voltage winding, 3 and 4 are ground shields, and 6
7 is a low voltage seed, 7 is a low voltage lead terminal, 8 is an iron core, and 10 is an outer box. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a device in which a winding terminal of a low voltage winding wound around an iron core is pulled out to the outside via a low voltage lead terminal provided on a side wall of an outer box housing the winding terminal, the axial direction of the low voltage winding on the side wall A transformer characterized in that the low voltage lead terminal is provided in a region facing a grounding shield covered with the iron core on the end side.