JPH05291058A - Transformer winding wire - Google Patents

Abstract

PURPOSE:To enable the winding wires of a transformer to be less affected by the hydrolysis of spacer material used for the winding wires keeping the winding wires high in insulating properties by a method wherein a spacer is formed through such a manner that natural cellulose or synthetic fiber or the mixture of them is formed into the shape of a spacer and a high molecular film is pasted on both the sides of the spacer concerned. CONSTITUTION:A spacer 3 is arranged between PET (polyethylene terephthalate) winding wires 1 through the intermediary of a support 2. The spacer 3 is composed of facing materials 3a and 3c in contact with the PET winding wire 1 and a press board 3b. The press board 3b is formed of natural cellulose or synthetic fiber such as aramide or the like or the mixture of them. The facing materials 3a and 3c are formed of high molecular film such as polyimide or polyphenylene sulfide. The press board 3b and the facing materials 3a and 3c are bonded together with high molecular adhesive agent 4. By this setup, less moisture can be transferred from a spacer to PET winding wires.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer for supporting a winding or the like, and more particularly to a transformer winding capable of preventing hydrolysis of the winding.

[0002]

2. Description of the Related Art In recent years, gas insulation transformers are required to have long-term reliability due to a great deal of damage caused by an accident in an urban area as high voltage and large capacity are advanced. However, when the gas insulation transformer is operated for many years like other electric devices, the insulation used changes with age and its mechanical strength gradually decreases.

For example, in the winding part of the transformer, windings usually coated with polyethylene terephthalate (PET) film are wound around the outer circumference of an insulating cylinder in multiple layers, and the windings have both cooling and insulating properties. Spacers are placed. Generally, a synthetic fiber such as natural cellulose or aramid fiber or a press board made of a mixed paper thereof is used as the spacer material.

[0004]

In this winding section,
At the part where the PET film, which is the insulating material of the winding, and the spacer are in direct contact with each other, the PET film deteriorates under the influence of the water content of the press board, and the surface layer falls off when the material itself reaches the end of its life. Can also happen.

This is because the PET film has a saturated moisture content of several hundred ppm, while the pressboard has a moisture content of several tens of times that of the PET film, and even when dried, the moisture content is at a level of several thousand ppm. , Press board to P
Water is easily transferred to the ET film. Of course, there is also the influence of moisture in the insulating gas, but that of the press board is direct and has a large influence. Therefore, if the PET film deteriorates due to these phenomena and thermal factors during long-term operation and its mechanical strength is significantly reduced, the influence of mechanical force such as external opening / closing surge or electromagnetic vibration may occur. The probability of damaging the winding part when receiving it increases,
There was a possibility of a short circuit accident. As described above, in the above winding portion structure, a spacer material having good workability and capable of reducing deterioration of the winding material due to hydrolysis has been desired.

The present invention has been proposed in order to achieve the above-mentioned demand, and an object thereof is to provide a transformer winding provided with a spacer material which retains insulation performance between winding groups and has little influence of hydrolysis on the windings. To provide the line.

[0007]

In order to achieve the above object, in the present invention, hydrolysis resistance is better and moisture permeation is better than a film used for winding on both sides of a press board which is a conventional spacer material. The structure is such that materials with low properties are adhered.

[0008]

With such a structure, the surface material has excellent hydrolysis resistance and a small amount of water permeation, so that almost no water is transferred to the winding wire and only the effect of water in the gas is exerted. If the material absorbs moisture, the effect of hydrolysis of the winding can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, in which a spacer 3 is arranged between a plurality of PET windings 1 via columns 2. The spacer 3 is composed of double-sided materials 3a and 3c in contact with the PET winding 1 and a press board 3b.

As the press board 3b, natural cellulose, synthetic fiber such as aramid fiber, or a mixture thereof is used. Further, the double-sided materials 3a and 3c are polyimide,
A polymer film having excellent hydrolysis resistance such as polyphenylene sulfide and having a small water permeation amount is used. The press board 3b and the double-sided materials 3a and 3c are adhered by a polymer adhesive 4. Of course, it is possible to use polymer or ceramics in whole or in part without using the press board, but by using the press board, it becomes a flexible structure to some extent,
There is no merit to correct the assembly distortion,
It is impossible in terms of workability and economy. Further, when the adhesive is not used, a gap between the materials occurs, which is not preferable.
In such a structure, the winding structure used has a low probability of being damaged by external force due to less deterioration of the PET winding due to hydrolysis even during long-term operation, and the transformer winding having excellent long-term reliability. Can be provided.

In the above examples, the polymer films were adhered to both sides of the press board. For example, it is preferable to coat the surface of the press board with a flexible polymer coating having excellent hydrolysis resistance and a small water permeation amount. Therefore, the same effect can be obtained, and economic merit due to process saving can be expected.

[0012]

As described above, in the winding structure portion of the present invention, the spacer having the constitution in which the polymer film having excellent hydrolysis resistance and low moisture permeability is adhered to both surfaces of the press board is provided. PE from spacer
Moisture transfer to the T winding can be reduced, the life of the PET winding can be improved, and a transformer winding that can be operated for many years can be provided.

[Brief description of drawings]

FIG. 1 is an enlarged configuration diagram of a winding portion in an embodiment of a winding structure portion of a transformer of the present invention.

[Explanation of symbols]

1 ... PET winding, 2 ... posts, 3 ... spacers, 3a, 3
c ... Double-sided material, 3b ... Press board, 4 ... Adhesive.

Claims (1)

[Claims] 1. A transformer winding in which an insulating spacer is arranged between windings, wherein the spacer is made of natural cellulose or synthetic fiber and a mixture thereof.
A transformer winding characterized in that a polymer film such as a polyimide or polyphenylene sulfide film is attached to both surfaces thereof.