JPS61105815A - Foil wound transformer - Google Patents

Abstract

PURPOSE:To prevent a foil coil from reaching out, to develop winding power of the coil and to cool down heat generated at a starting portion of the coil by arranging plural spacing pieces whose thickness is almost the same as a lead conductor at a regular space in a periphery of a base insulating cylinder. CONSTITUTION:Plural bar spacing pieces whose thickness is the same as or a little thicker than a lead conductor 1 fixed in the first part of a foil coil 6 are fixed at a regular space in a periphery of a base insulating cylinder on which the foil coil is wound. After the lead conductor 1 of the first winding is arranged between spacing pieces 20 arranged, and is fixed to the base insulating cylinder, the coil 6 is wound on it. Between these spacing pieces 20 or between the spacing piece 20 and the lead conductor 1, a cooling route 21 is formed and cooling medium is flowed. Therefore, reaching out of the foil coil by the first winding of the lead conductor is prevented, winding power of a foil coil on the base insulating cylinder is developed. A locally heated condition caused in the first winding of a low pressure coil is fully cooled down.

Description

Detailed Description of the Invention 1. Technical Field of the Invention - 1 Invention 1.11, a metal seal l~ and an insulating sheath 1~ are wrapped around the iron core with a foil winding consisting of a It is related to the Matoya Kengetsu-ki, especially the 9th body σ placed in the 1st part of the winding (4 and 11), and the installation (jl
This relates to a target-prevention IT device that has been improved in 17 ways.

1 Technique of invention 1 . J is several KV, several 10 (
Relatively high density of 1μ vΔ culm [low, small capacity variation) 1
：Brown C'31 Mitsukawa's 4'l- (There is. In view of the recent erosion and erosion of one place, J, the application to a transformer with high 7G voltage and human lifting is being researched. However, one of the technical problems with 1゛ is that the high voltage of the 11 foil coils causes disfigurement.''
C The following Sada is deducted by -1. , the beginning and end of winding of a55 wire (3t, general +; I
G;L Fig. 3 (As shown, it is a flat plate with a rectangular cross section [1 outgoing conductor 1.2 is electrically fixed.

In the foil winding of a human-carrying transformer, the cross section of the metal sheet 3 is as large as, for example, 1111111X1500111. In order to make it the same as or larger than 3, the cross section of A has a size of, for example, 10 mm x 150 mm. In conventional foil windings, the lead conductor 1 of the above dimensions attached to the end of the metal sheet 3 is fixed to the basic insulating tube 5 with, for example, adhesive tape, and the metal sheet 3 and the insulating sheet 4 are overlapped. It was wound to form a foil winding 6.

However, when the lead-out conductor 1 at the beginning of winding, which has a thickness of 10 nv+ as described above, is placed in the basic insulation cylinder 5F and the winding is wound, as shown in FIG. 4, [1-out conductor 1 The foil winding 6 bulges outward by a thickness of , and the outer diameter of the finally wound foil winding 6 protrudes by the above dimension. For example, if this occurs in the low voltage winding 7 wound on the inside as shown in Figure 4, the insulation distance between it and the high voltage winding 8 wound on the outside would be 91υ. (-), so the 11 lead conductor 1 + (:
, 1, .) It is extremely difficult to insulate the protruding corners 9 from a structural standpoint. On the other hand, the lead conductor 2 at the end of the winding arranged on the outermost periphery of the low voltage winding 7 also protrudes to the high FF winding 8 side due to its thickness, but the insulation performance is improved by rounding the end. can be retained.

J, in the large capacity transformer Y1-, the weight of the foil winding 6 itself is 1!・This weight may be as much as 1, but this weight cannot be supported by the tightening force fJ (winding 1, 1 force) of the sheet to the basic insulating cylinder 5.
In order to avoid leakage, it is desirable that the basic insulating cylinder 5 and the metal sheet 3 or the insulating sheets 1 to 4 be in close contact 14 as good as possible. Furthermore, for the above-mentioned reasons, it is necessary to considerably increase the tensile tension when wrapping the metal sheets 1 to 3 and the insulation sheet 4. Therefore, the basic insulation cylinder 5
Insulating padding 10 having a tapered part as shown in FIG. Due to the tension at high, rough, winding and opening 1, the metal sheets 1 to 3 are attached to the corners of the lead conductor 1. has been completed. However, the insulating filling 10 having this tapered part
The work of inserting the wires into both sides of the lead conductor 1 has poor workability and lacks reliability.

Furthermore, in a large-capacity foil-wound transformer, a structure as shown in FIG. 6 has been considered as a structure for fixing the lead conductor 1 to the basic insulating tube 5. That is, a groove 11 into which the lead conductor 1 fixed to the beginning of the foil winding 6 can be fitted is provided on the outer surface of the basic insulating cylinder 5 around which the foil winding 6 is wound. It is firmly fixed by fitting the lead conductor 1.

However, in the foil winding of a large-capacity transformer as described above, for example, 11 mm x 155 mm x 15
It is necessary to make a large groove of 0.00 mm, which results in poor cropping performance and a high grade of 1 to 1. In addition, in the foil winding of a large capacity transformer, the radial component of the short-circuit mechanical force is, for example, several thousands of inches, and in the inner winding it acts toward the center, so the basic insulation tube 5 needs to be thick to withstand internal compressive stress. For this reason, a basic insulating cylinder 5 with a thickness of several 10,111 m is required, and its manufacture is not easy and requires a rough 1-2cm height. There is also a risk that the foundation insulation cylinder 7a will crack due to the short-circuit mechanical force that causes stress concentration in this groove.

Furthermore, conventionally, the heat generated within the windings of a large capacity foil-wound transformer was cooled by being transmitted through the metal sheath I and the insulating sheath 1 in the radial direction by thermal conduction. However, at the beginning of the winding, a basic insulation tube is placed inside! However, the thermal conductivity to the inside is small, especially when the basic insulation cylinder is thick, and since the heat does not transfer to the basic insulation cylinder side, the only cooling effect is due to heat conduction to the outside of the winding. In addition, in a foil winding, eddy currents flow at both ends of the metal sheet in the width direction due to the winding leakage magnetic flux, so the loss at both ends is large and the amount of heat generated increases significantly. This eddy current causes localized overheating, but this eddy current also increases at both ends of the metal sheet located at the innermost circumferential side of the low voltage winding 7 and the outermost circumferential side of the high voltage winding 8, respectively. Further flowing through the metal sea 1 ~ 9
At the joint between the lead conductor -〇- and the metal conductor, the charged current flows unevenly to the end of the lead conductor on the metal sheet side on the drawer side, so that local overheating occurs in this portion. - As mentioned above, the winding start of the low-voltage winding is locally overheated compared to other parts, and as heat is not conducted to the basic insulation cylinder side, cooling efficiency is poor. , install the cooling path immediately after starting winding.
As a result, the workability of the foil winding wire was extremely poor.

[Object of the Invention] The present invention was proposed in view of the problems of the conventional foil-wound transformer as described above, and its purpose is to firmly fix the lead-out conductor at the beginning of the winding to the basic insulating tube. 1] A highly reliable foil-wound transformer that eliminates the protrusion of the outer diameter of the foil winding due to the lead-out conductor and has excellent cooling efficiency at the beginning of one winding. The offer is to cover.

[Summary of the Invention] The foil-wound transformer of the present invention has an eyelet () on the outer periphery of the basic insulating tube.
Space pieces with approximately the same thickness as the conductor at appropriate intervals = 7
= Arrange multiple pieces with 11 pieces between each piece.
The nine parts to be drawn out are housed and fixed to the basic insulating cylinder, and a cooling path is formed between four adjacent spacer pieces or lead conductors.
In particular, by passing through the medium, the foil winding is prevented from protruding outward, the winding force of the winding is strengthened, and the heat generated at the beginning of the winding is cooled down. It was made so that it could be done.

[Embodiment 1 of the Invention Hereinafter, an embodiment of the present invention will be explained in detail based on FIG. 1. It should be noted that the same parts as those of the conventional type shown in FIGS. 3 to 6 are designated by the same reference numerals, and their explanations are omitted.

In this embodiment, l is fixed to the outer periphery of the basic insulating cylinder 5 around which the foil winding 6 is wound +j l: J is fixed at the beginning of the winding of the foil winding 6.
j A plurality of rod-shaped spacing pieces 20 having a thickness equal to or slightly thicker than the D-output conductor 1 are fixed at appropriate intervals. The lead conductor 1 at the beginning of the winding is placed between the spacer pieces 20 and the spacer pieces 20 arranged in this way (it is fixed to the basic insulation cylinder, and the winding 6 is wound around the spacer piece 20). Also, this spacer piece -〇-20 and the spacer piece 20, or the spacer piece 20 and the lead conductor 1
A cooling passage 21 is formed between the cooling passage 21 and
The cooling medium is in communication with the

In the foil-wound transformer of this embodiment having such a configuration, the spacer piece 20 having the same thickness as the lead conductor 1 is arranged around the outer periphery of the basic insulating tube 5, so that when winding the winding wire, In addition, the lead conductor 1 prevents the foil winding 6 from protruding outward.
can be wound around the basic insulating cylinder 5 with a uniform winding force, increasing the adhesion between the metal sheet 3 and the insulating sheet 4.
There is no fear that the lead conductor 1 will be damaged by the corners. Furthermore, since the cooling medium is in communication with the cooling path 21 formed between the adjacent spacing pieces 20 or the lead conductors 1, the localized overheating state that occurs at the beginning of the low-voltage winding can be sufficiently cooled down. Therefore, the same number of windings as other parts can be applied, and the workability is significantly improved when manufacturing a foil winding wire. Further, since the spacing piece 20 used in the present invention has a simple structure, it can be manufactured in the cylinder, and its installation is also easy.

Note that the present invention is not limited to the embodiment shown in FIG. 1, but as shown in FIG. It is also possible to wrap and fix the spacing pieces 1 to 22 of A and A on the basic insulating cylinder 5.

[Effects of the Invention] As described below, according to the present invention, there is no protrusion of the foil winding to the outside by the conductor at the beginning of the winding (2). The winding fNI force of the winding becomes stronger.Also,
Since the local overheating condition -b- that occurs at the beginning of the low-voltage winding is cooled down in minutes, the same number of windings can be applied to other parts, resulting in high workability and reliability. - It has the effect of providing equipment.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the foil-wound transformer of the present invention, FIG. 2 is a perspective view of a spacer sheet used in another embodiment of the present invention, and FIGS. 3 and 4. 5 is an enlarged cross-sectional view of the main part of the lead conductor installed in a conventional foil-wound transformer. FIG. FIG. 2 is a perspective view of an example of a structure for fixing a lead conductor to a conventional foil-wound transformer. 1... Lead-out conductor at the beginning of the winding, 2... L-lead conductor at the end of the winding, 3... Metal sheet, 4... Insulating sheet, 5
...Basic insulating tube, 6. Foil winding, 7. Low voltage winding, 8. High voltage winding, 9. Corner of projecting part, 1
0... Insulating filling having a part of taper, 11... Groove,
20... Interval 11. 21... Cooling path, 22... Interval piece Sea 1~. 7317 Attorney Nido Norichika Kensuke (and 1 other person) No. 1
Figure 2

Claims (2)

[Claims] (1) A foil winding in which a winding made by overlapping a metal sheet and an insulating sheet is wound around a basic insulating tube, and lead conductors are electrically fixed to the beginning and end of the metal sheet. In the foil-wound transformer having the basic insulating cylinder,
A plurality of spacer pieces having approximately the same thickness as the lead-out conductor are arranged at appropriate intervals, the lead-out conductor is housed between the spacer pieces and fixed to the basic insulating tube, and the lead-out conductor is placed between the spacer pieces and the lead-out conductor is fixed to the basic insulating cylinder, and then A foil-wound transformer characterized in that a cooling path is formed between the lead conductors, and a cooling medium communicates within the cooling path. (2) The foil-wound transformer according to claim 1, wherein the spacing pieces are fixed to a spacing piece sheet at appropriate intervals, and the spacing piece sheet is wrapped and fixed around a basic insulating cylinder.