JPS595609A - Transformer winding - Google Patents

Abstract

PURPOSE:To uniformly cool each winding section with an insulating medium flowing through cooling passages by a construction wherein radial widths of inner and outer axial cooling passages between the adjacent spacers is set to be gradually increased from both spacer sides to the center part therebetween. CONSTITUTION:An outer insulating tube 12 is shaped into the form of a polygon having a corner 12a at each center between adjacent spacers 4, 4, while an inner insulating tube 11 is shaped into the form of a polygon having a corner 12a at the mounting part of each duct rail 8. Radial widths w11, w12 of inner and outer axial cooling passages 16, 17 are set to be gradually increased toward the centers, and the cooling passage 17 has the width larger than that of the cooling passage 16 to render smaller flow resistance. When the transformer oil is made to flow into the transformer winding provided with the cooling passages 16, 17 thus structured so as to cool each winding section 3, temperature distribution is uniformed in the winding section 3 and also the maximum temperature is lowered.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to transformer windings, and in particular improves the cooling path structure of disk windings in which insulating fluid such as transformer oil is cooled by forced circulation. related to things.

[Background technology of the invention and its problems]

The cooling path structure of a conventional transformer winding, for example, a disk winding that is cooled by forced circulation of insulating fluid, has an inner insulating tube l and an outer insulating tube 2, as shown in FIGS. 1 and 2. A radial cooling path 5 is formed by stacking a plurality of winding sections 3 in the axial direction with a plurality of spacers 41 disposed in the radial direction, in which a plurality of stages of winding sections 3 are formed by winding a wire into a disk shape between them, and An inner axial cooling path 6 and an outer insulating tube 2 are connected to each other between the inner circumference of the winding section 3 and the inner insulating tube 1 and between the outer circumference of the winding section 3 and the outer insulating tube 2 in communication with the radial cooling path 5. An axial cooling path 7 is formed. The transformer oil cools each winding section 3 by flowing through each cooling passage 5, 6.7-i.

By the way, in such a transformer winding, according to the results of experiments conducted by the inventors, the inner and outer axial cooling passages 6, 70
When the radial widths w, , w, are equal, the outer circumferential side of the winding section 3 has a higher temperature than the inner circumferential side, as shown in FIG. It was found that the temperature was higher in the center during the 4-hour period. This is thought to be because although the inner axial cooling passage 6 has a narrow cooling passage area and large flow resistance, the flow velocity is greater than that of the outer axial cooling passage 7, resulting in a larger heat transfer coefficient. It will be done.

Therefore, in such a transformer winding, the temperature at each part of the winding section 3 becomes non-uniform, and the insulation deteriorates quickly in the high-temperature parts, resulting in a decrease in reliability.

[Purpose of the invention]

The present invention has been made to eliminate the above-mentioned drawbacks.
It is an object of the present invention to provide a transformer winding that can equalize the temperature in each part of the winding section and reduce the maximum temperature.

[Summary of the invention]

In order to achieve this object, the present invention configures the radial widths of the inner and outer axial cooling passages between the spacers to gradually increase from the spacer side to the center between the spacers. , within
The valleys of the winding section are evenly cooled by the insulating medium flowing through the outer axial cooling path.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Fourth
In the figures and FIG. 5, a winding section 3 in which one strand of wire is wound in a disk shape is attached to the outside of an inner insulating cylinder 11, which has a plurality of duct rails 8 attached at equal intervals on its outer circumferential surface.
A plurality of spacers 4 attached to and arranged in the radial direction
Radial cooling passages 15 are stacked in multiple stages in the axial direction via
form. Further, an outer insulating cylinder 12 is provided outside each winding section 3. An inner axial cooling passage 16 is formed between the inner periphery of the winding section 3 and the inner insulating cylinder 11, and an outer axial cooling passage 17 is formed between the outer periphery of the winding section 3 and the outer insulating cylinder 12. do.

The outer insulating cylinder 12 has a corner part 12 in the center between the spacers 4 and 4.
The inner insulating cylinder 11 is formed into a polygonal shape having a corner portion 11a at the attachment portion of the duct rail 8. Therefore, the radial width W11 + we of the inner and outer axial cooling passages 16,17 between the spacers 4°4
t gradually becomes wider as it goes from the spacer 4 side to the center between the spacers 4.
Wider than 60 width.

Therefore, the flow resistance in the inner and outer axial cooling passages 16 and 17 is higher in the outer axial cooling passage 17 than in the inner axial cooling passage 1.
6, and between the spacers 4 and 4, it becomes smaller from the spacer 4 side to the center between the spacers 4 and 4. As a result of cooling each winding section 3 by flowing transformer oil through the transformer winding having such cooling passages 16 and 17, the temperature distribution in the winding section 3 is made uniform as shown in FIG. At the same time, the maximum temperature was lower than that of the conventional structure.

In addition, in the above embodiment, the inner and outer insulating cylinders 11.1
In 2, we explained the case where a rectangular insulating tube was used.
As shown in FIG. 7, the thickness of the portions of the inner and outer insulating cylinders 21 and 22 located between the spacers 4 and 4 is gradually increased from the spacer 4 side to the center between the spacers 4 and 4. By making the cooling passages thinner, each cooling passage 16, 17 can be configured to gradually become wider from the spacer 4 side to the central part between the spacers 4, 4.

〔Effect of the invention〕

As explained above, according to the present invention, the radial widths of the inner and outer axial cooling paths between the spacers are set so that the widths in the radial direction are from the spacer side to the center between the spacers, respectively <KL, and therefore gradually widen. With this structure, it is possible to uniformly cool the winding CEFSICON, reduce the maximum temperature, and provide a transformer winding with high insulation reliability.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a transverse cross section of a conventional transformer winding;
Figure 2 is a front view showing the section taken along the line ■-■ in Figure 1, Figure 3 is a diagram showing the temperature distribution in the transformer IE winding of Figure 1, and Figure 4 is a diagram showing the temperature distribution in the transformer IE winding of Figure 1.
The figure is a plan view showing a transverse section of a transformer winding according to the present invention, FIG. 5 is a front view showing a cross section taken along the line ■-V in FIG. 4, and FIG. Diagram showing the distribution, No. 7
The figure is a plan view showing another embodiment of the present invention. 1.11.21 Inner insulation tube 2, 12.22-Outer insulation tube 3 Winding section 4 Spacer 5.15
・Radial cooling passage 6,16 Inner axial cooling passage 7.
17 Outer axial cooling path 8 ・Duct rail (731
7) Agent: Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 3 Figure 4 Wa v, -J Figure 6 Figure 7 Procedure amendment (voluntary) Commissioner of the Japan Patent Office 1. Indication of the case Patent Application No. 57-112553 2, Name of the invention Transformer winding 3, Relationship to the amended case Patent applicant (307) Tokyo Shibaura Electric Co., Ltd. 4 Agent Address: 1-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100 -6 Inside the Tokyo Office of Tokyo Shibaura Electric Co., Ltd. (Drawing 11 6, Contents of Amendment (1) Addition of a leader line to Fig. 6 of the drawing attached with the present application, as shown in the attached sheet. No. 6

Claims (5)

[Claims] (1) Between the inner and outer insulating cylinders, a plurality of winding sections in which strands of wire are wound into plate shapes are arranged in multiple stages along the axial direction, and a plurality of winding sections are arranged in the radial direction between each stage of the winding sections. A radial cooling path is formed by arranging spacers, and inner and outer axial cooling paths are formed between the inner and outer insulating cylinders and each winding section, communicating with the radial cooling path. , in a transformer winding that causes an insulating fluid to flow between outer insulating cylinders, and between the spacers,
A transformer winding characterized in that the radial width of each outer axial cooling path is configured to gradually increase from the spacer side to the center between the spacers. (2) The transformer winding according to claim 1, wherein the outer insulating cylinder is formed into a polygonal shape having a corner at a portion located in the center between the spacers. (3) The outer insulating cylinder is configured to have a cylindrical shape, and the thickness of the portion located between the spacers gradually increases from the center between the spacers to the spacer side. Transformer winding described in scope 1. (4) The transformer winding according to claim 1, wherein the inner insulating cylinder has a polygonal shape having corners at the spacer attachment portion. (5) The inner insulating cylinder is configured to have a cylindrical shape, and the thickness of the portion located between the spacers becomes gradually thinner from the center between the spacers toward the spacers. Transformer winding described in scope 1.