JPH01130511A - Foil-wound transformer - Google Patents

Abstract

PURPOSE:To provide an excellent foil-wound transformer, by arranging inlet and outlet nozzles a little to the centers of cooling panel bodies from the ends in the peripheral direction, so that the adjacent nozzles are spaced from each other by a distance much larger than a distance between the cooling panels bodies. CONSTITUTION:Inlet nozzles 22a, 22b and outlet nozzles 23a, 23b are positioned a little to the centers of cooling panel bodies 26a, 26b from the ends in the peripheral direction, so that the adjacent nozzles are spaced from each other by a distance l2 which is much larger than a distance l0 between the panel bodies 26a, 26b. Accordingly, length of insulating connection pipes 25a, 25b can be increased by as much that the distance l2 becomes larger. Therefore, ever if relatively large error occurs in attachment of the cooling panels, such error can be absorbed well by the pipes 25a, 25b. Further, the pipes 25a, 25b can be attached easily. In this manner, an improved foil-wound transformer having high reliability can be obtained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a foil-wound transformer in which a cooling panel is built into a foil-like winding formed by overlapping and winding a metal sheet and an insulating sheet. It is related to vessels.

(Prior art) Foil-wound transformers, in which foil windings are formed by overlapping metal sheets and insulating sheets wound around the legs of an iron core, have a good space factor for the winding conductor, so It has the characteristics of being smaller and lighter than transformers that use rectangular wire conductors.

However, in order to realize higher voltage and larger capacity transformers, it is essential to further improve the cooling efficiency of the windings and provide the windings with high insulation ability. It has been considered to incorporate a cooling panel through which a refrigerant flows and to directly cool the heat generated from the windings.

Examples of this type of transformer include JP-A-54-16861.
No. 3 is known. As shown in FIG. 2, this transformer has a winding formed by overlapping and winding a metal sheet 2 and an insulating sheet 3 around a leg portion 1 of an iron core. This winding consists of a low voltage winding 4 and a high voltage winding 5.
has a built-in annular cooling panel 6.

As shown in FIG. 3, this cooling panel 6 is constructed by stacking two metal plates at an appropriate distance and sealing the periphery by welding or the like to form a cooling panel main body 16. The introduction nozzle 12 for feeding the refrigerant 1 is placed at the upper end.
4 are respectively arranged. Then, Freon R-113 or Fluorinert FC75 is added to the thin gap formed in the hollow part of the cooling panel 6.
The coolant 114 is enclosed, and this coolant 14 is circulated by the pump 7, and the heat generated within the winding is taken away by the latent heat of vaporization of the coolant 114, thereby performing cooling. That is, the refrigerant 14 that has absorbed heat is sent out from the outlet nozzle 13 to the outside of the winding, cooled in the cooler 9 provided outside the tank 8, and then sent into the cooling panel 6 again by the pump 7. A cooling system is constructed.

Note that the refrigerant 14 is collected in the fruit juice tube 10 before being sent into the cooling panel 6. Here, since the liquid collecting pipe 10 holds the same ground potential as the tank 8, the connection between the metal sheet 2 and the cooling panel 6 having the same potential is as follows.
This is done via an insulating pipe 11 made of Teflon resin or the like.

Further, the cooling panel 6 is disposed in contact with the metal sheet 2 or the insulating sheet 3 in order to cool the metal sheet 2 by thermal conduction. Further, since the cooling panel 6 is built into the winding, substantially the same voltage as that of the metal sheet 2 is applied to the cooling panel 6. Here, insulation between the metal sheet 2 and the cooling panel 6 and the outside is ensured by an insulating gas such as SFa gas sealed in the tank 8.

The foil-wound transformer described above is called a separate foil-wound transformer because the circulation circuit through which the refrigerant for cooling flows and the insulating gas are completely separated. It has advantages such as being able to be significantly smaller and lighter than a @-winding transformer, having high cooling efficiency, and high insulation reliability.

By the way, in the above-described separate foil-wound transformer, the cooling panels wound in the same layer are divided into two or more pieces, as shown in FIG. 4. This is because it has advantages such as improved workability when winding the cooling panel around the windings, improved workability when manufacturing the cooling panel, and improved cooling characteristics by flowing the coolant in parallel.

In FIG. 4, the cooling panel body 16a is divided into two parts,
Refrigerant inlet portions 17a and 17b are formed on one side of the circumferential side end portion of the lower end portion of 16b so as to protrude downward. And, these refrigerant inlet portions 17a, '17b
Introduction nozzles 12a and 12b are connected to the tips of the guide nozzles 12a and 12b so that their axial directions are approximately equal to the circumferential direction. Moreover, at the circumferential end portion of the upper end portion of the cooling panel bodies 16a, 16b opposite to the refrigerant inlet portions 17a, 17b, refrigerant outlet portions 18a, 18b are formed to protrude upward. The refrigerant outlet portions 18a, 1
Leading nozzles 13a and '13b are connected to the tip of 8b so that the axial direction thereof is approximately equal to the circumferential direction.

Here, the refrigerant inlet portions 17a, 17b of the adjacent cooling panel bodies 16a, 16b are arranged at opposing adjacent positions, and the refrigerant outlet portions 18a, 18b are also arranged at opposing adjacent positions. and the adjacent introduction nozzle 128.
12b is connected by a connecting pipe (hereinafter referred to as insulating connecting pipe) 15a made of an insulating material, and by a lead-out nozzle 13a.
, 13b are connected by insulated connection pipes 15b.

Further, the inlet nozzles 12a, 12b and the outlet nozzles 13a, 13b connected by the insulated connection pipe 15 are
It is connected via the insulated pipe 11 to a cooler 9 disposed outside the tank.

(Problems to be Solved by the Invention) However, in the conventional foil-wound transformer having the above configuration, when the cooling panel is wound into the winding during the manufacturing process of the winding, it is difficult to attach the cooling panel. The position may change, causing a relative error, and in this case, the following problems occur.

That is, as shown in FIG.
．． Since the distance 1 between the nozzles b is even shorter than the distance o between the cooling panel bodies 16a and 16b, even if a slight error occurs in the installation of the cooling panel 6, the distance 1 between the nozzles The error rate in installation is extremely large. Conventionally, the insulated connection pipes 15a and 15b that connect the nozzles are made of a flexible material such as Teflon resin in order to absorb errors in installation. cannot absorb this error, making it difficult to attach the insulating connection pipes 15a and 15b.

In addition, if the insulated connection pipe 15 is forcibly installed when the installation error is large, the large dimensional error will be corrected with a short length, which will generate excessive stress on the insulated connection pipe 15 and cause the insulation There was a problem in that the durability of the connecting pipe 15 was significantly reduced.

Incidentally, the above-mentioned problem exists not only in the two-divided cooling panel shown in FIG. 4, but also in foil-wound transformers using three or more divided cooling panels.

The present invention was proposed in order to eliminate the drawbacks of the prior art as described above, and its purpose is to facilitate the installation of insulated connection pipes between nozzles even when there is a large error in the installation of cooling panels. It is an object of the present invention to provide a highly reliable foil-wound transformer that does not generate excessive stress on an attached insulated connection pipe.

[Structure of the Invention] (Means for Solving Problems) The present invention provides a foil-wound transformer in which a cooling panel is divided into a plurality of parts in the circumferential direction of the winding. An inlet nozzle and an outlet nozzle are formed so as to be inclined from the circumferential end of the cooling panel toward the center in the circumferential direction, and are connected to the refrigerant inlet and the refrigerant outlet, respectively, on the circumferential side of the cooling panel. The configuration is characterized in that the nozzles are arranged offset toward the center in the circumferential direction so as to have a space between them and the extension line of the end portion, and then adjacent nozzles are connected by an insulated connection pipe.

(Function) In the foil-wound transformer of the present invention having the above-described configuration, since the introduction nozzle and the outlet nozzle are arranged closer to the center than the circumferential end of the cooling panel, there is a gap between adjacent nozzles. Since the distance between the nozzles becomes larger and the length of the insulated connection pipe connected between the nozzles can be increased, even if there is a large error in mounting the cooling panel, this error can be sufficiently absorbed by the insulated connection pipe. Therefore, the insulated connection pipe can be easily attached, and excessive stress will not be generated on the attached insulated connection pipe.

(Example) An example of the present invention as described above will be specifically described with reference to FIG. The basic configuration of the cooling panel of this embodiment is the same as that of the prior art shown in FIG. Limited to characteristic configurations and their effects related to the requirements of

Configuration of this embodiment* As shown in FIG. 1, the cooling panel main body 26 is divided into two parts.
On one side of the circumferential side end of the lower end of a, 26b,
The refrigerant inlet portions 27a, 27b are formed to protrude downward and to be inclined toward the center in the circumferential direction from the circumferential end portions of the cooling panel bodies 26a, 26b. And this refrigerant introduction port part 27a.

The introduction nozzle 228.22b connected to the tip of the cooling panel main body 26a, 27b is arranged at the center side with a constant distance from the circumferential side ends of the cooling panel bodies 26a, 26b. Further, at the circumferential end portions of the upper end portions of the cooling panel bodies 26a, 26b opposite to the coolant inlet portions 27a, 27b, refrigerant outlet portions 28a, 28b protrude upward, and the cooling panel body 26a.

It is formed so as to be inclined from the circumferential side end portion of 26b toward the circumferential center side. And, these refrigerant outlet portions 28a, 28b
The outlet nozzle 23a is connected to the tip of the outlet nozzle 23a.

23b is arranged at the center side with a constant distance from the circumferential side ends of the cooling panel bodies 26a, 26b.

Insulated connection pipes 25a and 2
5b, respectively.

Effects of this embodiment* In this embodiment having the above configuration, the introduction nozzles 22a, 22b and the outlet nozzle 23a.

23b is arranged closer to the center than the circumferential side ends of the cooling panel bodies 26a, 26b, the distance 2 between adjacent nozzles is much larger than the distance 0 between the cooling panel bodies 25a, 26b. , the cooling panel main body 16a,
This is significantly larger than the conventional spacing IL1 between the nozzles, which was smaller than the spacing fLo between the nozzles 16b. Therefore, compared to the conventional technology in which the distance fLl between the nozzles is small and the length of the insulated connection pipes 15a and 15b connecting between the nozzles is extremely short, the insulated connection Since the lengths of the pipes 25a and 25b can be significantly increased, even if there is a large error in mounting the cooling panel, it can be sufficiently absorbed by the insulated connection pipes 25a and 25b.
It also becomes easier to attach parts a and 25b. Further, since the lengths of the insulated connection pipes 25a and 25b are long, even if there is a large error in mounting the cooling panel, the insulated connection pipe 25a.

Since the rate of deformation of 25b is much smaller than in the conventional case, there is no problem of excessive stress being generated in insulated connection pipes 25a, 25b.

*Other Examples* Note that the present invention is not limited to the above-mentioned Examples,
For example, the cooling panel is not limited to being divided into two parts, but can be similarly applied to a cooling panel divided into three or more parts. Further, it is sufficient to use a known technique to construct the cooling panel body.

Furthermore, since the present invention particularly relates to improvements in the configuration of the cooling panel, the configuration of other parts of the foil-wound transformer, such as the support structure and insulation structure of the windings, or the configuration of the cooling system outside the windings, may be improved. etc. can be freely selected.

[Effects of the Invention] As explained above, in the present invention, by slightly changing the shape of the refrigerant inlet and refrigerant outlet of the cooling panel and the arrangement of the nozzles attached to each part, the present invention achieves the following: Even if there is a large error in installing the cooling panel, it is easier to install the insulated connection pipe than before, and it is also reliable and does not cause excessive stress on the installed insulated connection pipe. We can provide high quality and excellent foil-wound transformers.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a cooling panel used in an embodiment of the foil-wound transformer of the present invention, Fig. 2 is a sectional view showing the configuration of a conventional foil-wound transformer, and Fig. 3 is a conventional foil-wound transformer. A perspective view showing a cooling panel used in a transformer. FIG. 4 is a perspective view showing a two-part cooling panel used in a conventional foil-wound transformer. DESCRIPTION OF SYMBOLS 1... Leg of iron core, 2... Metal sheet, 3... Insulating sheet, 4... Low voltage winding, 5... High voltage winding, 6...
...Cooling panel, 7...Pump, 8...Tank, 9
...Cooler, 10...Liquid collection pipe, 11...Insulated pipe, 12, 12a. 12b, 22a, 22b... introduction nozzle, 13, 13
a, 13b, 23a, 23b-- Leading nozzle, 14-
...Refrigerant, 15a, 15b, 25a, 25b--Insulated connection pipe, 16.16a, 16b, 26a. 26 b--cooling panel body, 17a, 17b, 27
a, 27b... Refrigerant inlet portion, 18a, 18b, 28
a, 28b... Refrigerant outlet portion.

Claims (1)

[Claims] A foil winding is formed by overlapping and winding a metal sheet and an insulating sheet around the legs of an iron core, and a cooling panel for circulating a refrigerant is provided around the foil winding. The cooling panel is divided into a plurality of parts in the direction, and a refrigerant inlet port for guiding the refrigerant into the cooling panel is formed at the circumferential side end of the lower end of the cooling panel so as to protrude downward. A refrigerant outlet for guiding the refrigerant out of the cooling panel is formed at the circumferential side end of the upper end of the panel to protrude upward, and the refrigerant inlet and the refrigerant outlet have an inlet port. A foil-wound transformer in which a nozzle and a lead-out nozzle are connected to each other with their axial directions substantially equal to the circumferential direction, and further, adjacent lead-in nozzles and lead-out nozzles are connected by connecting pipes made of an insulating material. The refrigerant inlet and refrigerant outlet provided at the upper and lower ends of the cooling panel are formed to be inclined from the circumferential side end of the cooling panel toward the center in the circumferential direction, and the refrigerant inlet and the refrigerant guide are connected to each other. The introduction nozzle and the outlet nozzle are connected to the outlet respectively.
A foil-wound transformer characterized in that the foil-wound transformer is arranged so as to be shifted toward the center in the circumferential direction so that there is a gap between the cooling panel and the extension line of the circumferential side end of the cooling panel.