JPH0442896Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] This invention relates to an electrostatic plate for electromagnetic induction equipment, and more specifically, it relates to an electrostatic plate for electromagnetic induction equipment. This relates to electrostatic plates for

[Prior Art] FIG. 3 shows a part of a conventional transformer winding structure, in which a high voltage winding 2 and a low voltage winding 4 are connected to a transformer core 1.
is wound, and an electrostatic plate 3 is disposed at the line end of the high voltage winding 2. 5 is a composite insulator.

As shown in FIG. 4, the conventional electrostatic plate 3 has a metal foil (conductor) 32 wrapped around an insulating substrate 31 having a cross-sectional shape without corners, and a synthetic resin film 33 placed on top of the metal foil (conductor) 32. The electrostatic plate main body 34 is coated with
It was constructed by insulatingly covering the wet paper 35 and drying the wet paper 35.

The wet paper 35 has many layers in a wet state, and a paper layer is formed by drying the wet paper 35, and this paper layer can be molded into any shape.

[Problems that the invention aims to solve] With the conventional electrostatic plates for electromagnetic induction equipment as described above, when the plate becomes thick, it is necessary to repeat the process of laminating and drying, which takes a long time to stack wet paper. In addition to being difficult to work with, it also takes a lot of time to dry, making it expensive. Further, in drying, since drying starts from the outer periphery, there is a difference in the degree of dryness between the inside and the inside, causing problems such as cracks occurring due to the difference in shrinkage between the inside and outside.

This invention was made in order to solve the above-mentioned problems, and the purpose is to obtain an electrostatic plate for electromagnetic induction equipment that has improved quality and workability and is lower in cost.

[Means for solving the problem] The electrostatic plate for electromagnetic induction equipment according to this invention is made by drying crepe paper and wet paper coated on the outer periphery of the crepe paper in order to insulate the electrostatic plate body. The electrostatic plate body is covered with a composite insulating layer consisting of a paper layer and a paper layer composed of

[Function] In this invention, by distributing the insulating layer between crepe paper and a paper layer formed by drying a wet paper coated on the outer periphery of the crepe paper, the insulating layer of the paper layer is made larger than that of the conventional one. In addition to being able to be made thinner, crepe paper shrinks when the wet paper dries, increasing the density of crepe paper.

[Example] FIG. 1 shows an example of this invention, in which an electrostatic plate 7
Wrap crepe paper 36 around the electrostatic plate main body 34,
A wet paper paper 35 is wrapped around its outer periphery.

In this embodiment, the insulating layer is made thinner than the insulating layer of the wet paper 35 of the conventional electrostatic plate 3 by distributing it between the paper layer formed by drying the wet paper 35 and the crepe paper 36. As a result, the drying time of the wet paper 35 is shortened, making it less expensive, and no cracks occur. Further, since the crepe paper 36 has elasticity and elongation, it can be wrapped around the electrostatic plate main body 34 with good adhesion, has good workability, and forms a material that does not produce voids. However, crepe paper 36 is
Since it is easily damaged, it is desirable to cover it with something that has high dielectric strength and is not easily damaged. For the above reasons, in this embodiment, the wet paper 35 is wrapped around the entire outer circumference of the crepe paper 36. With this structure, the wet paper 35 shrinks when drying, tightens the crepe paper 36, increases the density of the crepe paper 36, and strengthens the dielectric strength.

In another embodiment shown in FIG. 2, layers of crepe paper 36 and wet paper 35 are alternately wrapped around the electrostatic plate body 34 of the electrostatic plate 8, similar to the embodiment shown in FIG. effects and improvements can be achieved. In Figure 2,
A wet paper 35 is wrapped around the electrostatic plate main body 34, a crepe paper 36 is wrapped on top of the wet paper 35, and a wet paper 35 is wrapped around the outer periphery of the crepe paper 36.
5 is wound, but the number of alternations between the crepe paper 36 and the wet paper 35 can be arbitrarily selected.

[Effects of the invention] As explained above, this invention has a structure in which the electrostatic plate body is covered with a composite insulating layer made of crepe paper and a paper layer made by drying a wet paper coated on the outer periphery of the crepe paper. As a result, quality and workability are improved, and costs are reduced. Another advantage is that insulation can be strengthened by increasing the density of crepe paper due to drying shrinkage of wet paper.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of this invention, Fig. 2 is a sectional view of another embodiment of this invention, Fig. 3 is a partial sectional view showing a conventional transformer winding structure, and Fig. 4. is a cross-sectional view of a conventional electrostatic plate. 7, 8... Electrostatic plate, 31... Insulating substrate, 32
...Metal foil, 33...Synthetic resin film, 34...
...Electrostatic plate body, 35...Wet paper, 36...Crepe paper. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claim for Utility Model Registration] An electrostatic plate body made by wrapping metal foil around the entire outer periphery of an insulating substrate having a predetermined cross-sectional shape, and further wrapping a synthetic resin film around the outer periphery, and covering this electrostatic plate body. An electrostatic plate for an electromagnetic induction device, comprising: a crepe paper made of a thin film, and a paper layer formed by drying the crepe paper and a wet paper coated on the outer periphery.