JPH0355809A - Separate type foil-wound transformer - Google Patents

Abstract

PURPOSE:To miniaturize the size of a tank, to scale-down even the kinds of machines of high tension and large capacity in an extent that transport does not get trouble, and to obtain the title transformer, which ion be assembled easily, by unifying the liquid introducing pipe of a cooling duct incorporated into a core to one end of a split cooling duct and disposing the liquid introducing pipe on either one surface of the top face and underside of the core or a side face thereof. CONSTITUTION:A transformer body constituted by incorporating cooling ducts 9a, 9 into a core 2 and sheet-shaped windings 3-5 respectively is housed into a tank 1 into which an insulating medium 12 is sealed, liquid introducing pipes 14a, 14 on the inlet side and the outlet side are installed to the cooling ducts 9a, 9, and the cooling ducts 9a, 9 are connected to the circulation system of a refrigerant through the liquid introducing pipes 14a, 14. In such a foil-wound transformer, the cooling duct 9a built in the core 2 is composed of split cooling ducts 21b, 22, 23, 23a divided at every main leg section, side leg section, upper yoke section and lower yoke section, the waveguides 14a on the inlet side and the outlet side are unified at one end of the cooling duct regarding at least one of each split duct while the waveguides 14a are arranged on either one surface of the top face and underside of the core 2 or a side face thereof.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a foil-wound transformer having a sheet-like winding formed by overlappingly winding a metal sheet and an insulating sheet. In particular, it relates to the connection and arrangement structure between a cooling duct provided inside the core and a liquid conduit for circulating an insulating medium therethrough.

(Prior Art) Foil-wound transformers equipped with sheet-shaped windings have recently been attracting attention because they have a good winding space factor and can be made smaller and lighter. As described in Japanese Patent Application Laid-Open No. 168613/1982, one of these foil-wound transformers has a completely separate refrigerant circulation system for cooling the windings and an insulating medium for the windings housed in a tank. Separate foil-wound transformers have been proposed.

FIG. 4 shows an example of the structure of a conventional separate foil-wound transformer.

In the figure, an insulating medium 12 such as SF6 gas is sealed in a tank 1 at high pressure, and an iron core 2 is provided inside the tank 1. A low-voltage winding 3, a medium-voltage winding 4, and a high-voltage winding 5 are sequentially wound concentrically on the outside of the main leg 2a of the iron core 2 with an insulation gap 6 in between. These low-voltage winding 3, medium-voltage winding 4, and high-voltage winding 5 are constituted by sheet-like windings formed by overlapping and winding a metal sheet 7 such as aluminum foil and an insulating sheet 8 such as polyester film. has been done. These windings 3, 4, 5 are insulated by the insulating medium 12 enclosed in the tank 1 as described above. Further, each of the windings 3, 4, and 5 has a built-in cooling duct 9 wound therein extending in the axial direction thereof. The cooling duct 9 uses Freon 113 or Fluorinert F.
It is hollow so that a refrigerant such as C75 can pass through it, and in the process of the refrigerant passing through the cooling duct 9, the winding 3. 4.
5. Cool. This refrigerant is cooled by a cooler 11 provided outside the tank 1 through a liquid guide pipe 14 and an insulating pipe 13, and is circulated by a pump 10.

Further, the iron core 2 also has a built-in cooling duct 9a like each winding 3.4.5, and has a structure for cooling the iron core 2 in the same way. The shape of the cooling duct 9a of this iron core 2 is
As shown in the figure. That is, the cooling duct}9a corresponds to the shape of the iron core 2, and is composed of divided cooling ducts 21 to 23 each divided into a main leg part, a side leg part, and a yoke part, and each divided cooling duct 21 to 23 has two ends. A liquid guiding pipe 14a is attached to protrude from the upper and lower surfaces.

(Problem to be solved by the invention) By the way, in such a separate foil-wound transformer,
The size of the tank 1 is determined by the height of the cooling duct 9a of the core 2, which has the largest height among the structural members of the transformer main body.

However, in the conventional separate foil-wound transformer, as shown in FIG. 5, since the liquid guide pipes 14a are attached to the upper and lower ends of the cooling duct 9a, the protrusion of the liquid guide pipes 14a is The dimensions of the tank 1 become unnecessarily large. As a result, when a transformer has a higher voltage and a larger capacity, the dimensions of the tank 1 become too large to be transported, and the amount of insulating medium 12 sealed in the tank 1 increases, resulting in higher costs. There were drawbacks.

In addition, in order to solve the above problems, as shown in FIG. 6, the main legs and lower yoke of the iron core are cooled by a cooling duct 21a that is integrated with the lower yoke, and the liquid guide pipe 14a of the cooling duct 21a is A side-mounted configuration has also been proposed. However, according to this structure, since the cooling duct 21a is integrated with the main leg and the lower yoke, the lower yoke, the main leg, and the side legs must be assembled at the same time. The assembly method of assembling the side legs alone and then connecting them to the lower yoke is no longer applicable, resulting in a disadvantage that the assembly time is significantly increased.

The present invention was proposed in order to eliminate the drawbacks of the conventional separate foil-wound transformer as described above, and its purpose is to improve the shape of the cooling duct and liquid guide pipe built into the iron core. To provide a separate type pre-wound transformer which can be miniaturized to the extent that even a high-voltage, large-capacity model does not hinder transportation by reducing the size of the tank, and can be easily assembled. It is in.

[Structure of the Invention] (Means for Solving the Problems) The separate foil-wound transformer according to the present invention has cooling ducts built into the core for each of the main leg, side leg, upper yoke, and lower yoke. It is composed of divided cooling ducts, and the inlet side liquid guide pipe and the outlet side liquid guide pipe, which were conventionally provided separately at both ends of each divided cooling duct, have been replaced with at least one of the divided cooling ducts. , is arranged integrally at one end of the divided cooling duct, and is characterized in that the integrated liquid guiding pipe is arranged on either the upper or lower surface or the side surface of the iron core. be.

(Function) In the present invention having the above structure, by disposing the liquid guide pipe on either the upper or lower surface or the side surface, the liquid guide pipe protrudes from both the upper and lower surfaces of the iron core. Therefore, the height of the cooling duct can be reduced, and the tank can be made smaller.

Furthermore, ease of assembly can be ensured by using divided ducts that are divided into the main leg, side leg, upper yoke, and lower yoke.

(Embodiment) Hereinafter, one embodiment of the separate foil-wound transformer according to the present invention will be described in detail with reference to FIGS. 1 to 3. Incidentally, the same members as those in the prior art shown in FIG. 4 and subsequent figures are given the same reference numerals, and explanations thereof will be omitted.

In this embodiment, as shown in FIG. 2, the cooling duct built into the iron core 1 includes a main leg, a side leg, an upper yoke,
2lb divided cooling duct divided into each lower yoke part,
22.23.23a. Among these divided cooling ducts, the upper yoke cooling duct 23
Regarding the cooling duct 22 of the side leg portion, similarly to the conventional divided cooling duct shown in FIG. 6, liquid guide pipes 14a are provided at both ends of the cooling duct on the inlet side and the outlet side, respectively. On the other hand, regarding the main leg divided cooling duct 2lb and the lower yoke divided cooling duct 23a, the liquid guiding pipes 14a on the inlet side and outlet side are provided close to one end of the divided cooling ducts 2lb and 23H. .

That is, the divided cooling duct 2l of these main leg portions and lower yoke
b, 23a, as shown in the enlarged view of FIG. 3, a central partition wall 24 is provided inside the divided cooling ducts 21b, 23a, extending from the liquid guide pipe 14a side to near the opposite end of the cooling duct. A plurality of ribs 25 provided parallel to the central partition wall 24 form a divided cooling duct 2lb. ．． Inside 23a, there is a refrigerant flow path 26 that flows in a U-turn from the liquid guiding pipe 14a side.
is formed. Note that this central partition wall 24 is formed into a divided cooling duct 2 by a welding method such as seam welding that does not cause side leakage.
lb. 23a.

In the main leg divided cooling duct 2lb having such a configuration, the integrated inlet side and outlet side liquid guiding pipes 14a are located above the iron core 1, and in the lower yoke divided cooling duct 23a,
An integrated inlet-side and outlet-side liquid guiding pipe 14a is provided so as to protrude from the side of the iron core 1. As shown in FIG. 1, each liquid guide pipe 14a is connected to an insulated pipe 13a on the refrigerant supply side and an insulated pipe 13b on the refrigerant recovery side.
It is connected to a refrigerant circulation system having a cooler 11 and a pump 10.

In this embodiment having such a structure, the cooling duct built into the iron core connects the main legs, side legs, upper yoke,
Since it is composed of separate cooling ducts divided into each lower yoke section, the assembly method that has traditionally been used when assembling transformers, in which the main legs and side legs are assembled separately and then connected to the lower yoke, can be applied. This makes assembly work easier. Further, since there is no liquid guide pipe protruding from the lower part of the iron core, the height of the cooling duct can be reduced, and the size of the transformer can be reduced.

(Other Embodiments) The present invention is not limited to the above-mentioned embodiments. For example, the cooling ducts shown in FIG. You can also do so.

Moreover, it is also possible to make the liquid guide pipes of all the divided cooling ducts protrude to the side of the iron core.

[Effects of the Invention] As described above, according to the present invention, the liquid guide pipes on the inlet side and the outlet side are arranged close to one end side of the divided cooling duct, and the liquid guide pipes are connected to either one of the upper and lower surfaces of the iron core or By simply protruding from the side, it is possible to provide a separate foil-wound transformer that is easy to assemble and is miniaturized.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the separate foil-wound transformer of the present invention, Fig. 2 is a front view showing the shape of the cooling duct of the core shown in Fig. 1, and Fig. 3 is an enlarged view of Fig. 2. 4 is a sectional view showing an example of a conventional separate foil-wound transformer, FIG. 5 is a front view showing the shape of the cooling duct of the core shown in FIG. 3, and FIG. 6 is the cooling duct shown in FIG. 5. FIG. 1...Tank, 2...Iron core, 3...Low voltage winding, 4
...Medium voltage winding, 5...High voltage winding, 6...Insulation gap, 7...Bank, 8...Insulation sheet, 9...Winding cooling duct, 9a...Iron core cooling duct, 10...
・Pump, 11...Cooler, 12...Insulating medium, 1
3... Insulated pipe, 14, 14 a ・= Liquid guide pipe, 2
1.21a, 2lb, 22, 23, 23a, ... divided cooling duct, 24 ... center partition, 25 ... rib, 2
6... Refrigerant flow path.

Claims (1)

[Claims] A metal sheet and an insulating sheet are layered and wound around the legs of an iron core to form a sheet-like winding, and a cooling duct is built into each of the iron core and sheet-like winding to form a transformer body. The main body of the device is stored in a tank filled with an insulating medium.
In addition, the cooling duct is provided with a liquid guide pipe on the inlet side and the outlet side, and the cooling duct is connected to the refrigerant circulation system via the liquid guide pipe,
In a separate foil-wound transformer in which the refrigerant circulation system is separated from the insulating medium sealed in the tank, cooling ducts built into the iron core are installed in the main legs, side legs, upper yoke,
It is composed of divided cooling ducts divided for each lower yoke part, and for at least one of each divided duct, the liquid guide pipe on the inlet side and the liquid guide pipe on the outlet side are arranged integrally at one end of the cooling duct. In addition, a separate foil-wound transformer characterized in that the integrated liquid guiding pipe is disposed on one of the upper and lower surfaces of the iron core or on a side surface.