JPS58170010A - Transformer - Google Patents

Abstract

PURPOSE:To form the transformer, for which a cooling duct is easily manufactured and cost thereof is low, by constituting the cooling duct while heat transfer plates made of a metal are arranged in the longitudinal direction to both side sections of a pipe made of a metal, disposing the heat transfer plates between a metallic sheet and an insulating sheet and setting up the heat transfer plates into winding. CONSTITUTION:Each heat transfer plate 19 mounted to one side section of the pipe 18 is fast stuck to the circumferential surfaces of the metallic sheets 7 under the state in which the plates 19 are curved along the circumferential surfaces extending over the whole circumferential direction of the metallic sheets 7 in winding sections, and each heat transfer plate 19 mounted to the other side section of the pipe 18 is fast stuck to the circumferential surfaces of the insulating sheets 8 under the state in which the plates 19 are curved along the circumferential surfaces extending over the whole circumferential direction of the insulating sheets 8. Both end sections of the pipe 18 are connected to insulating pipes 14. Consequently, the cooling ducts 17 are curved in response to the diameters of the winding sections by the winding tension of the metallic sheets 7 and the insulating sheets 8, and wound among both sheets 7, 8 together with both sheets 7, 8 under fast stuck states. Accordingly, the cooling ducts 17 and both sheets 7, 8 are fixed positively by mutual frictional force, and have a large cooling effect to winding.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention comprises a foil-wound wire in which a metal sheet and an insulating sheet are overlapped and wound, and a cooling duct through which a cooling medium is passed is built into the winding. Regarding transformers.

[Technical background of the invention]

Foil-wound transformers equipped with fIiIIk windings have a good space factor and are compact and lightweight, so they
, has already been put into practical use in relatively low voltage, small capacity transformers of several 100 kVA @ jl, and even higher voltage, large capacity transformers, for example! ? ! ikV%sooMv
Research is being conducted to expand its application to multi-layer transformers as well. The cooling method for the windings in this foil-framed transformer is to incorporate a cooling duct inside the coil, and to directly cool the heat generated from winding loss by feeding a refrigerant with excellent insulating properties, a so-called heat pipe. The formula is used.

FIG. 1 shows a transformer of this type. WAA
11 A tank filled with insulating oil or an insulating gas such as 8F gas as an insulating medium, and an iron core 1 is provided inside this tank 1. A low voltage winding a4 is wrapped around the main leg 1m of this iron core 1 via an insulating tube J, and this low voltage winding #4
High voltage is applied through the insulating barrier 6 to the outside world! There are 11 Jtp rolls in bales. These low voltage windings 4 and high voltage @ @ s tr
It is constituted by a foil-wound wire formed by overlapping and winding a metal sheet 1 such as an aluminum foil and an insulating sheet 8 such as a resin film. Note that each volume [416 is insulating oil sealed in a tank of 1 yen] is insulated by insulating gas. In addition, for example, one cooling duct is installed inside the low voltage winding 4, and a plurality of cooling ducts 9 are installed inside the high voltage winding 5.
Both forces are being kept inside. This cooling duct 9 is arranged concentrically in a 1@4.degree. 5 circular portion and is integrally assembled.

The cooling duct 9 is configured to allow a refrigerant such as Plon JJJ or Fe12 to pass through the inside, and this refrigerant absorbs heat from the metal sheet 7 in the winding 4.5 due to evaporative heat while passing through the cooling duct 9. and refrigerant winding 4.5. Outside the tank 1 is the condenser 10. Refrigerant tank 11 and bong [
A pipe J2 is provided connected to the liquid guiding pipe 13.

Metal liquid guiding pipes 13 are arranged at the upper and lower ends of the winding 4°5 in the circular part of the tank, and are insulated. The upper end and lower end of the cooling duct are connected via a tube 14. Then, the refrigerant is cooled and condensed by condensation (6 m + refrigeration), and the liquefied refrigerant is stored in a refrigerant tank 11 and then passed through a liquid guide pipe 13 and an insulating pipe 14 by a pump 12 to a cooling duct 9σ.
) is fed into the interior from its lower end. Further, the refrigerant cools the cooling duct 9 while passing through it, and then passes from the upper end of the cooling duct through the insulating pipe 14 and the liquid guide pipe 11 to reach the condenser 10. The refrigerant circulation circuit configured in this manner (which is separated from the insulating medium inside the transformer tank 1) is provided. In addition, the cooling duct 9 has a winding *4
．． 5, and the cooling duct 9 and the liquid guiding pipe JJ4 are insulated by the insulating tube 14. Also, in Figure 1, 6
1@4.8 leads and bushings are omitted.

Next, I will add an explanation about the cooling duct. One of the conventionally used cooling ducts 90) is one in which a flat duct is curved into a cylindrical shape leaving a gap, as shown in Figure 2.

This cooling duct 9 has a thin metal plate with a thickness of about 1 pot of rhinoceros. In order to prevent the refrigerant passage from being deformed and blocked, a spacing piece 15 is installed in the refrigerant passage as shown in Fig. 3, or a rib portion 16 is formed on the metal plate as shown in Fig. 4. A plurality of cooling ducts 9 with different diameters of the cylindrical portions are fabricated, and these cooling ducts 9 are wound by winding H4, 5.
They are arranged concentrically within the interior according to the diameter.

[Key points of background technology]

Therefore, when the cooling duct 9 is installed inside the winding 4.5, it is necessary that the surface of the cylindrical portion of the cooling duct 9 is brought into close contact with the metal sheet 7 or the insulating sheet 8 of the winding 4.5. In other words, if the adhesion between the cooling duct 9 and the sheet 7.8 of the windings 4 and 6 is poor, the thermal conductivity from the sheet 7.8 to the cooling duct 9 will drop appreciably, and the winding of the cooling duct) j 4.5, the cooling properties are significantly impaired. In addition, 1@415 is wound around the iron core 2 by applying tension to the metal sheet 7 and the insulating sheet 8 and winding them around the iron core 2 by the frictional force between the sheets 1 and 1 and between the sheets F and # and the cooling duct 9. The cooling duct 9 and the seat 1. If the contact with the wire is poor, the winding cannot be held securely.

For this purpose, the cylindrical portion of the cooling duct must be formed to form a perfect circle, and the diameter of the cylindrical portion must be formed with an error of 0.1 or less in accordance with the winding diameter of the winding wire. However, it is extremely difficult to manufacture the cooling duct 9, which requires such strict dimensional accuracy, only by sheet metal processing, so the outer cylinder part and the inner cylinder part are formed from metal plates by press working. They are manufactured by individually molding these metal plates and joining and fixing them by welding or brazing using a special jig. Since a plurality of types of cooling ducts having different diameters are provided in the %llI4.5, each cooling duct 9 is manufactured using a dedicated press m and a jig for each cooling duct. Therefore, there is a problem that manufacturing the cooling duct 9 requires a lot of effort and the manufacturing cost increases significantly.

[Purpose of the invention]

The present invention provides a transformer in which the cooling duct provided in the foil-wound winding has a new configuration, and the cooling duct is easy to manufacture and its manufacturing cost is low.

[A chest of inventions]

In the transformer of the present invention, the cooling duct is constructed by arranging metal heat exchanger plates in the longitudinal direction on both sides of a metal pipe, and the heat exchanger plates are placed between the metal sheet and the insulating sheet, and the cooling duct is arranged inside the winding. In other words, the cooling duct has a simple structure and can be manufactured easily and inexpensively, and can be easily formed into a cylindrical shape with an arbitrary diameter by winding it together with the sheet when manufacturing the winding. At the same time, the heat exchanger plate can be brought into close contact with the winding sheet.

1 [Embodiment of the Invention] As shown in FIG. 1, the transformer of the present invention consists of a metal sheet 1 and an insulating sheet 1 wrapped around a pig core 1 provided inside a tank 1 having a large insulating medium. Did you do it twice? A low pressure winding 114 consisting of an I winding and a low pressure winding 1 are wound, and each IIk@*,
A cooling duct (IF) is provided inside the j.

An embodiment of the transformer of the present invention will be explained with reference to Figures S to *@. This embodiment will be described using the high voltage winding 5 shown in FIGS. 5 and 6 as an example. Cooling ducts 11 are provided in a plurality of sa sections at different positions in the radial direction of the high voltage winding 5, respectively, and these cooling ducts 11 are arranged over the entire circumferential direction of the 4r first turn section. There is.

The cooling duct 11 includes a metal pipe 18 and this pipe 18
The cooling duct 11 of this embodiment is a cylindrical structure that surrounds the entire circumferential direction of the winding 5. The structure is shown in FIG. 7 and 8th vA will be described below.

In the figure, reference numeral 11 denotes a pipe made of metal such as aluminum, steel, or stainless steel for circulating the refrigerant, and this pipe 1 m has a diameter sufficient to allow the refrigerant to flow, for example, and has a round cross section. For example, the pipe 18 has a length longer than the metal sheet 7 of the winding 5 and is alternately turned and folded so that the folded portions are arranged continuously over the entire circumferential direction of each winding of the winding 5. It has a similar shape. Note that the inner end of the pipe 18 is connected to the insulating pipe 14.
It serves as a connection port. In the figure, reference numeral 19 denotes a heat transfer plate made of metal such as aluminum, copper, or stainless steel for transferring heat between the pipe 18 and the winding 5. A length W that is equal to or slightly larger than the axial length, a width that is larger than the diameter of the pipe J8, and a thickness that can be deformed by the winding tension when winding the metal of the winding 5 and the insulating sheet 8. For example, it has a flat rectangular plate shape. This heat exchanger plate 1# is the pipe 18
A plurality of pipes are arranged in parallel along the longitudinal direction on both sides of the pipe 18, and are fixed to the pipe 18 by welding or brazing. That is, by forming the pipe 1# into a shape in which the folded parts are lined up as described above, the heat transfer plate 1# is located at each folded part of the pipe 1# on both sides of the pipe IJ, and They are arranged in parallel in parallel so as to cover the entire circumferential direction of each winding portion. The developed length L connecting the outer edges of the pot heat transfer plates 19.1'# located at both ends corresponds to the circumferential length of each winding portion of the winding @S. The installation interval of heat transfer plates 1# in the pipe 18 is determined by the distance between adjacent heat transfer plates when the pipe 1a is bent and folded between each heat transfer plate 19 and processed so that each heat transfer plate 19 is parallel to each other. 919 comrades will not come into contact with each other.

The cooling duct 11 configured in this way is arranged between the metal sheet 1 and the insulating sheet 8 at a predetermined winding part of the winding l1lj, as shown in FIGS. It is curved into a cylindrical shape with a size corresponding to the diameter of the wound portion surrounding the entire circumferential direction, and is rolled up integrally with the metal sheet 7 and the insulating sheet 1. , (Eve J1 is self-positioned with each folded part located along the sheet axis direction,
The entire winding portion is curved in a cylindrical shape along the circumferential direction. The heat exchanger plates (1 m) installed on both sides of the pipe II and attached to each folded part are located along the longitudinal direction or the sheet axis direction, and are arranged in a cylindrical shape along the entire circumferential direction of the winding part. Each heat exchanger plate 1
9 is for both seats 1. #'s *a tension l The width direction is curved in an arc shape along the surface of sheet 7.8, and therefore, in the curved state, the entire surface of heat exchanger plate J# is exposed to metal sheet 1
Or it is in close contact with the circumferential surface of the insulating sheet 8. That is,
Each heat transfer plate 1# attached to one false part of the pipe 18 is in close contact with the metal sheet 1 in the entire circumferential direction of the metal sheet 1 in the winding part with a curved curve along the curved surface of the metal sheet 1, and Each of the heat transfer plates 1# to which the heat transfer plate 1# is attached is in close contact with the insulating sheet 8 over the entire circumferential direction of the insulating sheet 8, with the heat transfer plate 1 being curved along the circumferential surface of the insulating sheet 8. In addition,
Both ends of the arm eve 1# are connected to an insulating pipe 14.

Therefore, the cooling duct 11 consists of the metal sheet 1 and the insulating sheet 8.
Due to the winding tension, both sheets 1. are bent according to the diameter of the wound portion. Both sheets are in close contact between #1. ＃ and Ichigome are very talented.

For this reason, the cooling duct 11 and both seats 1. # is securely fixed by mutual frictional force, so that no vertical displacement occurs between the cooling duct (IF) and both sheets 1. It can be held by frictional force. The refrigerant sent by the pump 12 through the liquid guide pipe 13 and the insulated pipe 14 flows into the pipe 18 from one end thereof, and after passing through the inside of the pipe 18, the refrigerant is insulated from the other end. pipe 1
4 and flows out into the liquid conduit IJ. In this case pipe 7
1 has many folded parts, so that the refrigerant flows through the pipe 1.
1 and the cooling effect on the winding 1 is large. The heat generated in the metal sheet 1 in the winding 5 is conducted from the metal sheet 1 and the insulating sheet 8 to the heat transfer plate 1# that is in close contact with both sheets 1゜1 on both sides of the pipe 18, and further from the heat transfer &19. Conducted to pipe J8.

Therefore, the winding 5 is cooled by the refrigerant in the pipe 18. In this case, the cooling duct 11 is connected to the heat transfer plate 1
9, and since this heat transfer plate 1# is in close contact with the metal sheet 1 and the insulating sheet 1, the thermal conductivity between both sheets 1.8 and the heat transfer plate 1t is very good. , pipe 1
The winding ls5 can be effectively cooled by the refrigerant in the winding ls5.

2. In the above-described embodiment, the case of the high-voltage winding 5 has been described, but a similar cooling duct 17 is also provided in the low-voltage winding 4.

The case where the cooling duct 11 is manufactured and assembled inside the winding will be described with reference to FIGS. 9 and 10H. First, as shown in FIG. 9, a plurality of heat transfer plates 1g are arranged in series at a predetermined interval along the longitudinal direction of the pipe on both sides of a straight pipe 11, and these heat transfer plates 19 are melted. Or, if using brazing, fix it to the pipe 1゛8 using a steel plate. , f Eve 1
a is the length required for each cooling duct 17, and the number of heat transfer plates 19 required for each cooling duct 11 is attached to the pipe 1#.

The parts with one heat exchanger plate attached to pipe #1 should be made in advance to a large length and then cut to a length according to the diameter of each cooling duct 11. It is economical to do so. Next, as shown in FIG. 7, the heat exchanger plates 19 are arranged in parallel and the line connecting the ends of each heat exchanger plate 1# is the pipe 18.
The pipe 18 is formed into a wave shape by alternating the directions of the portions located between the heat exchanger plates 1# and stacking them at right angles to the straight line 4Is of the pipe 18. The product obtained in this manner is in the form of a cooling duct t-f developed, and has a simple structure in which only one heat exchanger plate is attached to the pipe 18, and is difficult to manufacture.

Moreover, since this product has the same configuration except for the unfolded length for each cooling duct 11, there is no need to individually vary the dimensional configuration for each cooling duct 11 and process it accurately. There is no need to use special tools for each. In addition, if the cooling duct 17 is manufactured with a large developed length L and cut into a predetermined length as necessary, it can be used commonly for cooling ducts 11 of various diameters.

Then, when manufacturing the winding wire as shown in Fig. 10,
The unfolded cooling duct 11 is rolled up together with the metal sheet 1 and the insulating sheet 8 and assembled. That is, due to the rotation of the winding drum 20, the metal sheet 1 and the insulating sheet 8
When applying tension and winding up the cooling duct 1 at a predetermined position,
When the cooling duct 17 is sandwiched between both sheets 7.8 and rolled up, the cooling duct 17 is sandwiched between both sheets 7.8 and rolled up.
Due to the winding tension of 8, the entire circumferential direction of the winding portion of the winding is deformed into a cylindrical shape and wound. in this case,
The pipe J8 of the cooling duct 11 is bent by the bending portion located between the heat exchanger plates 19 or by the winding tension of both sheets 7.8, and is bent into a cylindrical shape according to the diameter according to the circumference of the winding itself. At the same time, the heat exchanger plate 19 is also arranged in a cylindrical shape according to the circumference of the sheet 14112, and the heat exchanger plate 19 itself is curved so as to come into close contact with both sheets 1,1.

Therefore, the cooling duct 11 can be automatically wound into the winding together with both sheets 1.1 and brought into close contact with the sheets 1 and 8, and there is no need for press processing to form a cylindrical portion with an accurate diameter. Become. Furthermore, the cooling duct 11 does not need to be provided with spacers or ribs unlike conventional cooling ducts.

In addition, the pipe J8 in the cooling duct 11 is not limited to one with a round cross section, but may be a round pipe crushed to increase the joint area with the heat exchanger plate 1#, as shown in FIG. A pipe 1# having a rectangular cross section as shown in FIG. 11(b) can be used. The heat exchanger plate J# is not limited to one whose length is approximately the same as the width of the metal sheet 7, but may have a length approximately half the length of the metal sheet 1 as shown in FIG. 12 (1). Alternatively, as shown in FIG. 12(b), it is also possible to use a configuration in which two pieces having the same length are arranged side by side, or a structure in which three pieces having approximately 1/3 of the length are lined up as shown in FIG. 12(b). The heat transfer 919 is not limited to a flat plate, but may be a plate having a dogleg shape in cross section so that the central portion is lower as shown in FIG.

This is to provide elasticity to the heat transfer plate 19 to improve its close contact with the sheet.

The developed size of the cooling duct 11 shown in FIG. 7 is not limited to a size approximately equal to the circumferential length of the winding in the portion where the cooling duct 11 is disposed, but may be approximately 1/2 of the circumferential length of the winding. 1/4.1
The cooling ducts 11 may be set to a size of /6, 1/8, etc., and in this case, a plurality of cooling ducts 11 are combined and arranged in the circumferential direction of the winding.

The configuration in which the cooling duct 17/ is provided at the winding portion of the winding is not limited to the embodiment. For example, a configuration may be adopted in which a plurality of heat transfer plates are arranged in the winding axis direction, and a bent metal pipe is meandered in the axial direction so as to extend in the circumferential direction within a range that does not form one turn, and the heat transfer plates are They can also be arranged circumferentially and axially of the winding.

〔Effect of the invention〕

In the transformer of the present invention, the cooling duct provided inside the foil-wound winding has a configuration in which a heat transfer I[ is attached to the pipe, and this heat transfer plate is placed between the metal sheet of the winding and the insulating sheet, and the cooling duct is arranged around the circumference of the coil. It is assumed that they are arranged in all directions. Therefore, the configuration of the cooling duct is simple, and the cooling ducts provided in the respective winding portions having different winding diameters can have a common configuration.

Therefore, cooling ducts having different diameters can be easily and commonly manufactured. When manufacturing the winding wire on the sash, the cooling duct is sandwiched between the metal sheet and the winding sheet and wound together, and the winding tension of the sheet causes the cooling duct to be shaped according to the diameter of the winding wire. The heat exchanger plate can be automatically deformed along the circumferential direction and wound into the winding with the heat exchanger plate in close contact with the sheet. This eliminates the need for press work to form each cooling duct, and eliminates the need for the use of many types of press dies and tools for this press work, making it very economical.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional transformer, Figure 2 is a perspective view of a cooling duct used in a conventional transformer, Figure 3 is a cross-sectional view of the cooling duct, and Figure 4 is a cross-sectional view of the cooling duct. A perspective view showing a part of the transformer, No. sll is a sectional view showing a foil-wound winding in one embodiment of the transformer of the present invention, FIG. 6 is a perspective view of the same, and FIG. 7 is a cooling duct of the second embodiment of the same. 8 is a side view of the same, FIG. 9 is an explanatory diagram showing intermediate parts in the manufacturing process of the cooling duct, and Fig. 1θ is an explanatory diagram showing the state in which the cooling duct is rolled up Figure, 1lIi11 (
12(a) and 12(b) are front views showing other examples of the heat exchanger plate of the cooling duct, respectively. The figure is a side view showing still another example of the heat exchanger plate. 1...Tank, 2...Iron core, 4...Low voltage winding, 5
...High voltage winding, 1...Metal sheet, 8...Insulating sheet, t...Cooling duct, 17...Cooling duct, J
I...pipe, 19...heat exchanger plate. ! Applicant 4th generation M 5ll-4
-Rin EIEjii 1st I73 0 2nd ■ 5s Figure 6 Figure 7 Figure 7 Figure 8 Figure 9 Figure 10rj! J 12th m

Claims (1)

[Claims] The cooling duct is equipped with a foil-wound wire made by stacking a metal sheet and an insulating sheet, and a cooling duct is built into the oval winding. Metal heat transfer plates are arranged and fixed on both sides of the pipe in the longitudinal direction of the pipe, respectively.
A transformer characterized in that the winding is disposed between a metal sheet and an insulating sheet in the circumferential direction of the winding, and is in close contact with each of the sheets.