JPH0132729Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to stationary induction equipment such as transformers and reactors, and in particular relates to the inner group pack film provided to prevent moisture absorption in the insulation of this type of equipment. .

Taking a transformer as an example of a stationary induction device, its structure will be explained below. In a conventional transformer, as shown in FIG. 1, a coil 1 is surrounded by an insulating material 2 to form an inner group 3. The inner group 3 is packed with a inner group pack film 5 made of a film insulator such as a fluororesin sheet such as fluorinated ethylene propylene to prevent the insulator from absorbing moisture. Iron core 4 is on the outside of content group 3,
These are stored in the tank 9, and the tank 9
has a tank flange 6 at the bottom.

In order to pass an insulating medium (oil or gas) or a cooling medium into the inner group when the transformer is used, the inner group pack film 5 must be cut at the top and bottom after the work inside the tank is completed. Therefore, the pack film is cut and taken out from the opening of the tank flange 6 at the bottom of the tank.

Figure 2 is an enlarged detailed view of the inner part of Figure 1.
Since the pack film 5 is protected on its side by the pack film protection plate 7, it is cut at the top and bottom (the upper part is not shown) along cutting lines a.

Conventionally, the packing film cutting work was carried out by having a worker enter the tank or cut the flange (for example, flange 6) installed on the tank when the work inside the tank was completed.
The tank was cut using a knife or the like, but the lower part of the tank was particularly narrow, making cutting difficult and requiring a lot of time. In addition, the cut surface was in poor condition with cut edges remaining.

This idea was made in consideration of the above,
The purpose of this invention is to provide a stationary induction device that can easily cut and remove the inner group pack film as described above, and incorporates a heating wire such as a nichrome wire that can be fused by heat into the inner group pack film. The heating wire is energized,
By cutting the pack film with this heat generation, the above object is achieved.

The invention will now be described with reference to illustrative embodiments.

FIG. 3 is a diagram showing the same part as FIG. 2 in this invention, and a heating wire 8 such as a nichrome wire is incorporated at a position corresponding to the cutting line a in FIG. 2.

In this way, if the heating wire 8, such as a nichrome wire, is installed in advance by pasting it on the film 5 at any desired position on the pack film 5 to be cut, the electric wire 8 can be connected after completing the work inside the tank. By energizing the hot wire, the film 5 can be melted and cut by the heat generated. Since the film is fused, there are no chips at the cutting line and no finishing work is required. The cut pack film and nichrome wire can be easily taken out from the opening of the flange 6.

According to this invention, a heating wire such as a nichrome wire is installed on the pack film inside the group, and the heat generated by the wire can cut the pack film, eliminating the need for cutting with a knife or the like in a narrow tank. Since the fusing operation can be carried out in a short time, there is a great advantage in terms of preventing moisture absorption in the insulation. Cutting by fusing can not only be done in a short time, but also allows the inside of the tank to be narrower than before, which has the effect of making the tank smaller.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of the internal structure of a conventional transformer, Fig. 2 is a detailed partial sectional view showing the inner part of Fig. 1, and Fig. 3 is an example of a stationary induction device according to this invention. FIG. 2 is a partial cross-sectional view similar to FIG. 1... Coil, 2... Insulator, 3... Content group, 4... Iron core, 5... Content group pack film, 6... Tank flange, 7... Pack film protection plate, 8... Heating wire, 9...Tank. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A stationary induction device having an inner group pack film made of a fluorine resin sheet or the like to prevent moisture absorption by an insulator, characterized in that a heating wire is incorporated in the inner group pack film to melt it by generating heat. stationary induction equipment.