JPH0864431A - Induced electric appliance coil - Google Patents

Abstract

PURPOSE: To provide a small-sized induced electric appliance coil that the speed of a running fluid in a horizontal cooling path near an inflow port in a cooling region is increased and an attempt is made to uniformize a distribution of the speed of a running fluid among a plurality of horizontal cooling paths and the coil is excellent in cooling efficiency. CONSTITUTION: Discoid coils 3 having a plurality of steps are laminated and arranged between an inside insulation cylinder 1 and an outer insulation cylinder 2. A plurality of horizontal cooling paths are radially arranged among respective neighboring discoid coils 3. A plurality of inside vertical cooling paths 8 and a plurality of outer vertical cooling paths 9 respectively communicating with the plurality of horizontal cooling paths 5 are formed between the inside insulation cylinder 1 and discoid coil 3 and between the outer insulation cylinder 2 and discoid coil 3. An insulation fluid flows from inwardly to outwardly in the horizontal cooling path 5 of cooling regions 21, 23. The relationship between a space dimension S1 between the inside insulation cylinder 1 of the inside vertical cooling path 8 and the discoid coil 3; and a space dimension SO between the outer insulation cylinder 2 of the outer vertical cooling path 9 and the discoid coil 3 is constructed to be SI>SO.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction electric winding for cooling using an insulating fluid such as SF ₆ gas as a refrigerant, and more particularly to improvement of its cooling structure.

[0002]

2. Description of the Related Art Windings used in induction electric appliances such as transformers and reactors generate a large amount of heat during operation. Therefore, generally, a cooling passage is formed around the winding, and an insulating fluid such as SF ₆ gas, insulating oil, or perfluorocarbon is made to flow in this cooling passage as a refrigerant to cool the winding.
FIG. 9 is a plan view showing an example of windings of a conventional transformer having such a cooling structure, and FIG. 10 is a sectional view taken along the arrow Y in FIG. First, as shown in FIG. 9, a disk winding 3 formed by winding a wire conductor is coaxially arranged between an inner insulating cylinder 1 and an outer insulating cylinder 2 which are coaxially arranged. . As shown in FIG. 10, the disk windings 3 are stacked in multiple stages in the axial direction of the insulating cylinders 1 and 2.

Further, as shown in FIG. 9, a plurality of horizontal spacing pieces 4 are radially arranged at equal intervals between each two adjacent disc windings 3, whereby the disc winding is performed. A plurality of fan-shaped horizontal cooling paths 5 are radially formed in the radial direction of the line 3. Furthermore, the inner insulating cylinder 1 and the disk winding 3
Between the outer insulating cylinder 2 and the disk winding 3,
A plurality of vertical spacing pieces 6 and a plurality of vertical spacing pieces 7;
The disk windings 3 are arranged on the inner and outer circumferences of the arrangement portion of the horizontal spacing pieces 4. As a result, on the inner side and the outer side of the disk winding 3, a plurality of linear inner vertical cooling paths 8 extending in the axial direction over the plurality of disk windings 3, and a plurality of linear outer vertical cooling paths. The paths 9 are formed respectively. That is,
The plurality of inner vertical cooling passages 8 and the plurality of outer vertical cooling passages 9
Are formed to connect the plurality of horizontal cooling paths 5.

Further, as shown in FIG. 10, the inner vertical cooling passage 8 is closed for each plurality of stages of the disk winding 3, and the inner closing is extended from the inner vertical cooling passage 8 to the horizontal cooling passage 5. The plates 10 and the outer closing plates 11 that close the outer vertical cooling passages 9 and extend from the outer vertical cooling passages 9 to the horizontal cooling passages 5 are arranged alternately and over the entire circumference of the disc winding 3. Is provided. In this way, the inner closing plates 10 and the outer closing plates 11 are alternately arranged for each of the plurality of stages of the disk winding 3, so that the inner vertical cooling passages 8 and the outer vertical cooling passages 9 are alternately closed. , The positions of the inlet and the outlet of the insulating fluid in the horizontal cooling passage 5 are reversed,
It is configured to reverse the flow direction of the insulating fluid inside. That is, the inner closing plate 10 and the outer closing plate 1
For each cooling zone divided by 1, the flow direction of the insulating fluid will be reversed.

In this case, in FIG. 10, four cooling zones 21 to 24 are shown from the bottom to the top, but the insulating fluid flows from the inside to the outside in the first cooling zone 21. , The inner blocking plate 10 reverses the rotation, and the second
In the cooling area 22 of, the flow is from the outside to the inside. Furthermore, the insulating fluid is reversed by the outer closure plate 11, flows from the inner side to the outer side in the third cooling zone 23, and subsequently is reversed by the inner closure plate 10, and in the fourth cooling zone 24 from the outer side to the inner side. Flowing toward. in this way,
The insulating fluid reverses the flow direction in each of the cooling sections 21 to 24 and flows in a zigzag manner between the inner insulating cylinder 1 and the outer insulating cylinder 2 between the respective disk windings 3 to thereby It will be cooled.

[0006]

However, the windings of the conventional transformer having the above-mentioned structure have the following problems. That is, in each of the cooling sections 21 to 24 of the winding of FIG. 10 formed by the inner blocking plate 10 and the outer blocking plate 11, the flow velocity of the insulating fluid branched to each horizontal cooling passage 5 is the same as that near the outlet. It tends to be large at the upper part and small at the lower part near the inlet.

In particular, this tendency is caused by the vertical cooling passages 8 inside and outside,
9 and the horizontal cooling passage 5 have a large cross-sectional area ratio, and the smaller the cross-sectional area of the vertical cooling passage 5, the more remarkable it appears. That is, as compared with the case where the insulating fluid flows from the outside to the inside of the disk winding 3, the case where the insulating fluid flows from the inside to the outside of the disk winding 3 is more The flow velocity distribution tends to be more uneven.

Therefore, each cooling area 2 of the winding of FIG.
Within 1 to 24, the flow velocity distribution 20 of each horizontal cooling passage 5
Is in a state as shown by a dashed arrow in FIG. In this case, the ratio of the lengths of the broken lines indicates the ratio of the magnitudes of the flow velocity.

Therefore, in each of the cooling zones 21 to 24, as compared with the disk winding 3 arranged in the upper part near the outlet of the insulating fluid, the disk arranged in the lower part serving as the inlet of the insulating fluid. There is a problem that the winding 3 is not sufficiently cooled. In particular, the insulating fluid flows from the inside to the outside as compared with the disk winding 3 which is arranged in the lower portion near the inlet in the cooling sections 22 and 24 where the insulating fluid flows from the outside to the inside of the disk winding 3. There is a problem that the disk winding 3 arranged in the lower part, which is near the inlet of the cooling sections 21 and 23 flowing toward, is not sufficiently cooled.

Therefore, even though the inner closing plate 10 and the outer closing plate 11 are attached so that the insulating fluid is made to flow in a zigzag shape in the winding, the expected uniform winding of each disk winding 3 is obtained. The cooling effect cannot be obtained, the temperature rise of the winding cannot be made uniform, and the cooling efficiency becomes low. In addition, an excessive temperature rise locally occurs in the lower part near the inlet in each cooling zone 21 to 24, which deteriorates the insulator used for the winding and shortens the life of the transformer. Problems such as occur. Particularly, in the cooling sections 21 and 23 where the insulating fluid flows from the inner side to the outer side of the disc winding 3, such a local excessive temperature rise is remarkable,
The problem is more serious.

As a measure against such a problem, the disk winding 3
It is conceivable to increase the cross-sectional area of the wire conductor forming the wire to reduce the current density and to design the winding cooling based on the minimum flow velocity of the insulating fluid in the horizontal cooling path 5.
In either case, there is a drawback that the winding is enlarged. It is also conceivable to reduce the mounting pitch of the inner closing plate 10 and the outer closing plate 11 to increase the flow velocity of the horizontal cooling passage 5, but in this case, the flow rate decreases as the flow resistance increases. However, there is a drawback that the temperature of the upper part of the winding becomes high as a result. The above-mentioned problems are not limited to the windings of the transformer, but are generally present in the windings of dielectric electric appliances such as reactors having the same structure.

The present invention has been proposed in order to solve the above problems of the prior art, and its purpose is to:
(EN) It is intended to increase the flow velocity of a horizontal cooling passage near an inflow port in a cooling area to make the flow velocity distribution among a plurality of horizontal cooling passages uniform and to provide a small induction electric winding with excellent cooling efficiency. .

More specifically, an object of the present invention is to provide a lower horizontal cooling passage in which the insulating fluid is the most difficult to flow in a cooling zone in which the insulating fluid flows from the inside to the outside of the disk winding. By increasing the flow velocity, the flow velocity distribution among a plurality of horizontal cooling channels is made uniform. Claim 2
The purpose of the invention described is to reduce the flow velocity of the upper horizontal cooling passage in which the insulating fluid is most likely to flow and increase the flow velocity of the lower horizontal cooling passage in which the insulating fluid is most difficult to flow, in each cooling zone. It is to make the flow velocity distribution among a plurality of horizontal cooling paths uniform. An object of the invention according to claim 3 is to reduce the flow resistance between a plurality of cooling zones and increase the total flow rate of the insulating fluid flowing in the windings, thereby reducing the mounting pitch of the closing plate and making it horizontal. The goal is to increase the minimum flow velocity in the cooling passages, thereby homogenizing the flow velocity distribution among the horizontal cooling passages. Claim 4
An object of the described invention is to improve the degree of freedom in design by standardizing the communicating portion of the closing plate and allowing the cross-sectional area to be easily set and changed. An object of the invention described in claim 5 is to further improve the function of the communicating portion by appropriately setting the cross-sectional area of the communicating portion of the closing plate.

[0014]

In the induction winding according to the present invention, a plurality of stages of disk windings are stacked and arranged between an inner insulating cylinder and an outer insulating cylinder, and each adjacent disk winding is arranged. A plurality of horizontal cooling passages are radially formed with a plurality of horizontal spacing pieces interposed therebetween, and a plurality of horizontal cooling paths are formed between the inner insulating cylinder and the disk winding and between the outer insulating cylinder and the disk winding. In an induction coil winding having a plurality of inner vertical cooling passages and a plurality of outer vertical cooling passages that respectively communicate a plurality of horizontal cooling passages with vertical spacing pieces interposed, the cooling passages are configured as follows. It is characterized by that.

That is, first, the invention according to claim 1 is
At least a part of the horizontal cooling channels of the plurality of horizontal cooling channels is an induction motor winding configured so that the insulating fluid flows from the inside to the outside of the disc winding, and with the inner insulating tube of the inner vertical cooling channel. The relationship between the space dimension S _I between the disk winding and the space dimension S _O between the outer insulating cylinder of the outer vertical cooling path and the disk winding is S _I > S _O. It is characterized by that.

Next, the invention according to claims 2 and 3 closes the inner vertical cooling passage for each plurality of stages of the disk winding, and extends from the inner vertical cooling passage to the horizontal cooling passage. , And outer closing plates that extend from the outer vertical cooling path to the horizontal cooling path by closing the outer vertical cooling path and alternately and around the entire circumference of the disc winding. The cooling area is narrowed in the induction coil winding that is configured to form a plurality of cooling zones by the plate and the outer closing plate and to flow the insulating fluid in a zigzag manner by reversing the flow direction in each cooling zone. The second inner closing plate and the second outer closing plate are newly provided, or alternatively, the inner closing plate and the outer closing plate are configured to communicate with a part of the vertical cooling passage. .

That is, according to the second aspect of the present invention, the second inner closing plate extending from the inner vertical cooling passage to the horizontal cooling passage is provided in the cooling area located under the inner closing plate. The second inner closing plate has a communicating portion that communicates a part of the inner vertical cooling passage, and is configured to close the inner vertical cooling passage at a portion other than this communicating portion.
Then, a second outer closing plate extending from the outer vertical cooling passage to the horizontal cooling passage is provided in the cooling area located under the outer closing plate. The second outer closing plate has a communicating portion that allows a part of the outer vertical cooling passage to communicate with each other, and is configured to close the outer vertical cooling passage at a portion other than this communicating portion.

Further, in the invention according to claim 3, the inner closing plate has a communicating portion for communicating a part of the inner vertical cooling passage, and the inner vertical cooling passage is closed by a portion other than this communicating portion. Composed. The outer closing plate has a communicating portion that allows a part of the outer vertical cooling passage to communicate with each other, and is configured to close the outer vertical cooling passage at a portion other than this communicating portion.

Further, in the invention described in claims 4 and 5, in the configuration of the invention described in claim 2 or 3,
Further, it is characterized in that the communicating portion of the second inner closing plate or the second outer closing plate, or the communicating portion of the inner closing plate or the outer closing plate is configured as follows. That is, in the invention as set forth in claim 4, the communicating portion is a plurality of holes having an equivalent cross-sectional area and provided in a portion crossing the inner vertical cooling passage or the outer vertical cooling passage. Further, in the invention according to claim 5, the cross-sectional area of the communicating portion is in the range of 10% to 50% of the cross-sectional area of the inner vertical cooling passage or the outer vertical cooling passage.

[0020]

According to the present invention having the above-mentioned structure, by improving the structure of the cooling passage, the flow velocity of the lower horizontal cooling passage near the inflow port in the cooling zone can be increased. That is, according to the first aspect of the invention, the space dimension S _I between the inner insulating cylinder of the inner vertical cooling passage and the disk winding and the outer insulating cylinder of the outer vertical cooling passage and the disk winding are By configuring so that the relationship with the space dimension S _O between them becomes S _I > S _O , the circumferential direction of the inner vertical cooling passage and the outer vertical cooling passage according to the difference between the inner diameter and the outer diameter of the disk winding. The cross-sectional area of the inner vertical cooling channel can be increased by compensating for the dimensional difference. Therefore, in the cooling zone in which the insulating fluid flows from the inner side to the outer side of the disk winding, when S _I = S _O , the flow velocity of the lower horizontal cooling passage, which is the portion where the insulating fluid hardly flows, is It can be increased by setting S _I > S _O.

According to the second aspect of the present invention, the second inner closing plate and the second outer closing plate reduce the cross-sectional area of the vertical cooling passages in each cooling zone. It becomes difficult for the insulating fluid to flow to the upper part. Therefore, 1
In the two cooling zones, the flow velocity of the upper horizontal cooling passage, which is the portion where the insulating fluid flows most easily when the second closing plate is not provided, can be reduced by providing the second closing plate. In the case where the second closing plate is not provided, the flow velocity of the lower horizontal cooling passage, which is the portion where the insulating fluid hardly flows, can be increased by providing the second closing plate.

According to the third aspect of the invention, the cross-sectional area of the vertical cooling path between the plurality of cooling areas is reduced by the inner closing plate and the outer closing plate, and the insulating fluid is horizontal in the closing plate portion. Although flowing in the cooling passage, a part of the insulating fluid will rise in the vertical cooling passage as it is through the communicating portion. The flow resistance between the cooling zones is reduced in accordance with the rising flow rate, and as a result, the total flow rate of the insulating fluid flowing in the winding can be increased. Therefore, it is possible to increase the minimum flow velocity of the horizontal cooling path by reducing the mounting pitch of the closing plate without increasing the flow resistance of the entire winding.

According to the fourth aspect of the present invention, the communication portion of the closing plate is constituted by a plurality of holes having an equivalent cross-sectional area. Therefore, the communication can be achieved simply by setting the cross-sectional area and the number of the holes appropriately. The cross-sectional area of the part can be easily set and changed. Further, according to the invention of claim 5, by limiting the cross-sectional area of the communicating portion of the closing plate to the range of 10% to 50% of the cross-sectional area of the vertical cooling passage, the flow rate to the upper part of the closing plate can be reduced. The flow rate flowing through the horizontal cooling passage can be controlled appropriately.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of the induction electric winding according to the present invention will be specifically described below with reference to FIGS. The same parts as those of the conventional example shown in FIGS. 9 and 10 are designated by the same reference numerals.

[1] First Embodiment ... FIGS. 1 to 3 FIGS. 1 and 2 are views showing a first embodiment in which the invention of claim 1 is applied to a winding of a transformer. 2 is a sectional view taken along arrow X in FIG. 2, and FIG. 2 is a plan view. First, as shown in FIG. 2, a disk winding 3 formed by winding a wire conductor is coaxially arranged between an inner insulating cylinder 1 and an outer insulating cylinder 2 which are coaxially arranged. . As shown in FIG. 1, the disc windings 3 are stacked in a plurality of stages in the axial direction of the insulating cylinders 1 and 2.

Further, as shown in FIG. 2, a plurality of horizontal spacing pieces 4 are radially arranged at equal intervals between each two adjacent disc windings 3, whereby the disc winding is performed. A plurality of fan-shaped horizontal cooling paths 5 are radially formed in the radial direction of the line 3. Furthermore, the inner insulating cylinder 1 and the disk winding 3
Between the outer insulating cylinder 2 and the disk winding 3,
A plurality of vertical spacing pieces 6 and a plurality of vertical spacing pieces 7;
The disk windings 3 are arranged on the inner and outer circumferences of the arrangement portion of the horizontal spacing pieces 4. As a result, on the inner side and the outer side of the disk winding 3, a plurality of linear inner vertical cooling paths 8 extending in the axial direction over the plurality of disk windings 3, and a plurality of linear outer vertical cooling paths. The paths 9 are formed respectively. That is,
The plurality of inner vertical cooling passages 8 and the plurality of outer vertical cooling passages 9
Are formed to connect the plurality of horizontal cooling paths 5.

Further, as shown in FIG. 1, the inner vertical cooling passage 8 is closed for each plurality of stages of the disk winding 3, and the inner vertical extension extending from the inner vertical cooling passage 8 to the horizontal cooling passage 5 is closed. The plates 10 and the outer closing plates 11 that close the outer vertical cooling passages 9 and extend from the outer vertical cooling passages 9 to the horizontal cooling passages 5 are arranged alternately and over the entire circumference of the disc winding 3. Is provided. In this way, the inner closing plates 10 and the outer closing plates 11 are alternately arranged for each of the plurality of stages of the disk winding 3, so that the inner vertical cooling passages 8 and the outer vertical cooling passages 9 are alternately closed. The positions of the inflow port and the outflow port of the insulating fluid in the horizontal cooling passage 5 are reversed, and the flow direction of the insulating fluid in the horizontal cooling passage 5 is reversed. That is, the inner blocking plate 10 and the outer blocking plate 11
The flow direction of the insulating fluid will be reversed in each cooling section divided by. In this case, in FIG. 1, as in the conventional example shown in FIG.
Two cooling zones 21-24 are shown.

In addition to the above structure, in this embodiment, as shown in FIG. 1, the dimension of the inner vertical cooling passage 8 in the radial direction of the disk winding 3, that is, the inner vertical cooling passage 8 is formed. Distance S between the inner insulating cylinder 1 and the disk winding 3
_I , the dimension of the outer vertical cooling path 9 in the radial direction of the disk winding 3,
That is, the relationship between the outer insulating cylinder 2 of the outer vertical cooling passage 9 and the space dimension S _O between the disc winding 3 is S _I > S _O. The relationship between the spacing dimensions is
It is given by the diameter dimensions of the inner insulating cylinder 1, the outer insulating cylinder 2, and the disk winding 3 and the dimensions of the vertical spacing pieces 6 and 8 arranged between them.

The operation of this embodiment having the above construction is as follows. First, in the winding wire of the present embodiment, the insulating fluid basically flows in the same manner as in the conventional example shown in FIG. That is, in FIG. 1, the insulating fluid flows from the inner side to the outer side in the first cooling section 21, is reversed by the inner closing plate 10, and flows from the outer side to the inner side in the second cooling section 22. Furthermore, the insulating fluid is reversed by the outer closure plate 11, flows from the inner side to the outer side in the third cooling zone 23, and subsequently is reversed by the inner closure plate 10, and in the fourth cooling zone 24 from the outer side to the inner side. Flowing toward. In this way, the insulating fluid is cooled by the cooling area 21.
The flow direction is reversed every .about.24 and flows between the disk windings 3 in a zigzag manner between the inner insulating cylinder 1 and the outer insulating cylinder 2 to cool the entire winding.

Here, the circumferential dimension of the inner vertical cooling passage 8 and the outer vertical cooling passage 9 is the circumferential dimension of the outer vertical cooling passage 9 depending on the difference between the inner diameter and the outer diameter of the disk winding 3. Is significantly larger. Therefore, the space dimension S _I between the inner insulating cylinder 1 of the inner vertical cooling passage 8 and the disk winding 3 and the space dimension between the outer insulating cylinder 2 of the outer vertical cooling passage 9 and the disk winding 3 When the relationship with S _O is S _I = S _O , the cross-sectional area of the inner vertical cooling passage 8 becomes small. In this case, the flow velocity of the lower horizontal cooling passage 5 in the first and third cooling zones 21 and 23 in which the insulating fluid flows from the inside to the outside becomes small, and the flow velocity distribution in the cooling zones 21 and 23 becomes small. It becomes uneven.

On the other hand, in this embodiment, the space dimension S _I between the inner insulating cylinder 1 of the inner vertical cooling passage 8 and the disk winding 3 and the outer insulating cylinder 2 of the outer vertical cooling passage 9 are arranged. The cross-sectional area of the inner vertical cooling passage 8 is increased by setting the relationship between the space dimension S _O between the disk winding 3 and the disk winding 3 to be S _I > S _O. Therefore, according to the present embodiment, the first and third cooling zones 21 through which the insulating fluid flows from the inner side to the outer side,
At 23, the flow velocity of the horizontal cooling passage 5 therebelow can be increased. As a result, the flow velocity distributions 2 of the plurality of horizontal cooling paths 5 in the first and third cooling areas 21 and 23
The 0s are fairly equalized as indicated by the dashed arrows in the figure.

FIG. 3 is a graph showing the flow velocity distribution of the plurality of horizontal cooling passages 5 in each cooling zone 21-24. As is clear from this figure, when S _I = S _O , the flow velocity in the cooling sections 21 and 23 flowing from the inside to the outside is large in the upper part and small in the lower part, but as in the present embodiment, S _I > S _O. By this, the flow velocity distribution in the cooling sections 21 and 23 is made more uniform, and the cooling sections 22 flowing from the outside to the inside are
It is possible to approach the flow velocity distribution within 24.

As described above, according to this embodiment,
In the cooling sections 21 and 23 where the insulating fluid flows from the inner side to the outer side of the disk winding 3, where the cooling efficiency is the worst and a local excessive temperature rise occurs, the horizontal cooling paths 5
It is possible to improve the cooling efficiency by making the flow velocity distribution 20 of (1) substantially uniform. Therefore, it is possible to suppress the temperature rise of the lower disk winding 3 in the cooling areas 21 and 23, and it is possible to prevent the local excessive temperature rise which has been a problem in the past.

[2] Second Embodiment FIG. 4 FIG. 4 is a sectional view showing a second embodiment in which the invention of claim 1 is applied to the winding of a transformer, as in the case of the first embodiment. is there. In the present embodiment, the inner blocking plate 10 and the outer blocking plate 11 provided in each of the plurality of stages of the disc winding 3 in the first embodiment are removed, and other parts are
The structure is exactly the same as that of the first embodiment.

In the winding of the present embodiment constructed as described above, since the inner blocking plate 10 and the outer blocking plate 11 are not provided, the insulating fluid does not flow in a zigzag shape, and the insulating fluid does not flow inside. While going up in the vertical cooling passages 8, they are diverted into the horizontal cooling passages 5 and flow from the inside to the outside, flow into the outside vertical cooling passages 9, and rise inside the outside vertical cooling passages 9. In this case, in this embodiment, as in the first embodiment, the inner insulating cylinder 1 of the inner vertical cooling passage 8 is formed.
And the disc winding 3 have a spacing dimension S _I and a spacing dimension S _O between the outer insulating cylinder 2 of the outer vertical cooling channel 9 and the disc winding 3 have a relation of S _I > S _O By doing so, the cross-sectional area of the inner vertical cooling passage 8 is increased. Therefore, according to the present embodiment, it is possible to increase the flow velocity of the horizontal cooling passages 5 below the windings, and the plurality of horizontal cooling passages 5 formed in the windings.
The flow velocity distribution 20 of is substantially uniformized as shown by the dashed arrow in the figure.

As described above, according to this embodiment, in the winding in which the insulating fluid flows from the inside to the outside of the disk winding 3,
The cooling efficiency can be improved by making the flow velocity distributions 20 of the plurality of horizontal cooling paths 5 fairly uniform. Therefore, it is possible to suppress the temperature rise of the lower disc winding 3 to a small extent, and it is possible to prevent the occurrence of a local excessive temperature rise, which has been a problem in the past.

[3] Third Embodiment FIG. 5 FIG. 5 is a sectional view showing a third embodiment in which the invention according to claim 2 is applied to a winding of a transformer. In this embodiment, the first
In addition to the configuration of the embodiment, the second inner closing plate 12 is provided in the central portion of the cooling areas 21 and 23 located at the lower part of the inner closing plate 10, and the cooling located at the lower part of the outer closing plate 11 is performed. The second outer blocking plate 13 is provided in the central portion of the areas 22 and 24. In this case, the second inner closing plate 12 and the second outer closing plate 13 are basically the same as the inner closing plate 10 and the outer closing plate 11 from the inner vertical cooling passage 8 and the outer vertical cooling passage 9. Although they are arranged so as to extend over the horizontal cooling passages 5, respectively, they have the following features. That is, the second inner blocking plate 12
Has a communicating portion 12a communicating with the inner vertical cooling passage 8 in a part of the portion that crosses the inner vertical cooling passage 8, and closes the inner vertical cooling passage 8 with a portion other than the communicating portion 12a. Is configured. Similarly, the second outer blocking plate 13 has a communicating portion 13a for communicating the outer vertical cooling passage 9 in a part of the portion that crosses the outer vertical cooling passage 9, and other than the communicating portion 13a. The part is configured to close the outer vertical cooling passage 9. More specifically, the communication portions 12a, 13a of the second inner closing plate 12 and the second outer closing plate 13 are formed by a gap formed between the second inner closing plate 12 and the inner insulating cylinder 1. , And a gap formed between the second outer blocking plate 13 and the outer insulating tube 2 respectively. The other parts are constructed in exactly the same manner as in the first embodiment.

In the winding wire of this embodiment constructed as described above, the insulating fluid flows in a zigzag shape as in the first embodiment. In this case, in each of the cooling areas 21 to 24, the cross-sectional area of the inner vertical cooling passage 8 or the outer vertical cooling passage 9 is narrowed by the second inner closing plate 12 or the second outer closing plate 13. . Therefore, in each cooling section 21-24, it becomes difficult for the insulating fluid to flow from the second inner blocking plate 12 or the second outer blocking plate 13 to the upper part. As a result, within one cooling zone,
The flow velocity of the horizontal cooling passage 5 located above the second inner closing plate 12 or the second outer closing plate 13 is reduced, and the flow rate is lower than the second inner closing plate 12 or the second outer closing plate 13. The flow velocity of the horizontal cooling passage 5 can be increased. In this case, the flow velocity distribution 20 of the plurality of horizontal cooling passages 5 in each of the cooling sections 21 to 24 is made considerably uniform as indicated by the broken line arrow in the figure.

As described above, according to this embodiment, in each of the cooling zones 21 to 24, the flow velocity of the upper horizontal cooling passage 5, which has been the most flowable portion in the prior art, is reduced, and the flow rate is reduced in the most difficult portion in the prior art. It is possible to increase the flow velocity of the lower horizontal cooling passage 5 which has existed. As a result, each cooling area 21
The cooling efficiency can be improved by considerably homogenizing the flow velocity distribution 20 within 24. Therefore, it is possible to suppress the temperature rise of the lower disk winding 3 in each of the cooling zones 21 to 24, and it is possible to prevent the local excessive temperature rise which has been a problem in the related art. .

[4] Fourth Embodiment FIG. 6 FIG. 6 is a sectional view showing a fourth embodiment in which the invention described in claim 3 is applied to a winding of a transformer. In this embodiment, the first
In the configuration of the embodiment, the inner closing plate 10 and the outer closing plate are arranged at a finer pitch, and the inner closing plate 10 and the outer closing plate 11 have the second inner closing plate 12 of the third embodiment. And the second outer closing plate 13
It is characterized in that the same communication parts 10a and 11a are provided. That is, in this embodiment, the inner blocking plate 1
The reference numeral 0 has a communicating portion 10a which communicates with the inner vertical cooling passage 8 in a part of the portion that crosses the inner vertical cooling passage 8, and the inner vertical cooling passage is closed with a portion other than the communicating portion 10a. Is configured. Similarly, the outer closure plate 1
1 has a communicating portion 11a communicating with the outer vertical cooling passage 9 at a part of a portion that crosses the outer vertical cooling passage 9, and the outer vertical cooling passage 9 is provided at a portion other than the communicating portion 11a.
Is configured to close. More specifically, the communication portion 10 between the inner closing plate 10 and the outer closing plate 11
a and 11a are a gap formed between the inner blocking plate 10 and the inner insulating tube 1, and the outer blocking plate 11 and the outer insulating tube 2.
And a gap formed between the two. The other parts are constructed in exactly the same manner as in the first embodiment. Further, in FIG. 6, six cooling zones 21 to 26 are shown from the bottom to the top.

When an insulating fluid is caused to flow through the winding wire of the present embodiment having the above-described structure, the insulating fluid flows in a zigzag shape as in the first embodiment, but between the adjacent cooling zones, With the inner closing plate 10 or the outer closing plate 11,
The cross-sectional area of the inner vertical cooling passage 8 or the outer vertical cooling passage 9 is reduced. Therefore, the insulating fluid rising in the vertical cooling passages 8 and 9 flows to the horizontal cooling passage 5 by the inner closing plate 10 or the outer closing plate 11, but a part of the insulating fluid is inside the closing plate 10 or the outer closing plate 11. Communication part 1
The vertical cooling passages 8 and 9 ascend as they are through 0a and 11a. That is, the insulating fluid that rises in the vertical cooling passages 8 and 9 is supplied to the inner closing plate 10 or the outer closing plate 1.
By 1, the insulating fluid is split into the horizontal cooling passage 5 and the insulating fluid rising in the vertical cooling passages 8 and 9 as it is.

By the way, the respective cooling areas 21 to 2 of this embodiment
In FIG. 6, the flow velocities of the plurality of horizontal cooling passages 5 are large in the upper portion and small in the lower portion, but such a difference in the flow velocities is similar depending on the flow rate ratio of the horizontal cooling passages 5 to the total flow rate in the winding. Get smaller. Therefore, in order to increase the minimum flow rate of the lower horizontal cooling passage 5, it is necessary to reduce the mounting pitch of the inner closing plate 10 and the outer closing plate 11 to increase the flow rate ratio of the horizontal cooling passage 5. in this case,
If the mounting pitch is simply reduced, the total flow rate in the winding decreases as the flow resistance increases.

On the other hand, in the case where the inner closing plate 10 and the outer closing plate 11 are provided with the communicating portions 10a, 11a as in the present embodiment, as described above, a part of the insulating fluid is communicated. The vertical cooling passages 8, as they are, via the portions 10a, 11a.
9 will be raised. As described above, the larger the flow rate ratio that goes up the vertical cooling paths 8 and 9 without passing through the horizontal cooling path 5, the smaller the flow resistance becomes, and as a result, the total flow rate flowing in the windings increases. become. Therefore, according to the present embodiment, the inner blocking plate 10 and the outer blocking plate 11 can be provided without increasing the flow resistance of the entire winding.
It is possible to increase the minimum flow velocity of the horizontal cooling passage 5 by reducing the mounting pitch of the.

That is, by providing a gap in the inner and outer blocking plates at positions corresponding to the inner and outer vertical cooling passages and allowing a part of the insulating fluid to escape to the upper part, the flow resistance of the entire winding is reduced. Without increasing, the mounting pitch of the inner and outer closing plates can be made smaller to increase the minimum flow rate in the horizontal cooling passage. In this case, the flow velocity distribution 20 of the plurality of horizontal cooling paths 5 in each cooling area 21 to 26 is
As shown by the dashed arrow in the figure, it is considerably uniformized.

As described above, according to this embodiment, in each of the cooling zones 21 to 26, the flow velocity of the upper horizontal cooling passage 5, which has been the most flowable portion in the prior art, is reduced, and the flow rate is reduced in the most difficult portion in the prior art. It is possible to increase the flow velocity of the lower horizontal cooling passage 5 which has existed. As a result, each cooling area 21
The cooling efficiency can be improved by making the flow velocity distribution 20 within ~ 26 substantially uniform. Therefore, it is possible to suppress the temperature rise of the lower disk winding 3 in each of the cooling zones 21 to 26, and it is possible to prevent a local excessive temperature rise which has been a problem in the past. .

[5] Fifth Embodiment FIG. 7 FIG. 7 is a sectional perspective view showing a fifth embodiment in which the invention according to claim 4 is applied to a winding of a transformer. In this embodiment, the second outer blocking plate 13 of the third embodiment or the fourth outer blocking plate 13 of the third embodiment is used.
Outer closure plate 1 used as outer closure plate 11 of the embodiment
4 is an example of the configuration of FIG. That is, this outer blocking plate 14
The communicating portion 14a of is configured as a plurality of holes having an equivalent cross-sectional area provided in a portion that crosses the outer vertical cooling passage 9.

According to the outer closing plate 14 of the present embodiment having the above-mentioned structure, it is exactly the same as the second outer closing plate 13 of the third embodiment or the outer closing plate 11 of the fourth embodiment. The action and effect are obtained. In particular, in this embodiment, since the communicating portion 14a of the outer blocking plate 14 is configured as a plurality of holes having an equivalent cross-sectional area, the communicating portion 14a can be formed simply by appropriately setting the cross-sectional area and the number of the holes. The cross-sectional area can be easily set and changed. Therefore, the communication portion 14a of the outer blocking plate 14 can be standardized, and the degree of freedom in design can be improved.

[6] Other Embodiments The present invention is not limited to the above-described embodiments, and various other modified examples can be implemented. For example, the specific mounting pitch of the inner closing plate 10 and the outer closing plate 11 in the first to fourth embodiments, and the second inner closing plate 12 and the second outer closing plate 13 in the third embodiment.
The specific mounting pitch and the like can be appropriately selected.
For example, in the third embodiment, the second inner closing plate 12 and the second outer closing plate 13 are arranged in the respective cooling sections 21 to 24.
Although it is provided at the central portion of the inside, it is also possible to provide it at the upper side or the lower side in each of the cooling sections 21 to 24. In addition, in the cooling areas 21 to 24, such communication portions 12a, 13
a second inner closure plate 12 and a second outer closure plate 1 having a
A configuration in which a plurality of 3 are provided is also possible.

Furthermore, in the fifth embodiment, the communicating portion 14a of the outer closing plate 14 is formed as a plurality of holes having an equivalent cross-sectional area, but the communicating portion of the inner closing plate may be formed in the same manner. It is possible. Further, it is also possible to configure by combining closing plates having different configurations of the communication portion. In addition, in each of the above-mentioned embodiments, an example in which they are applied to the windings of the transformer is shown, but the present invention is not limited to the windings of the transformer, and the windings of the reactor are similar. It can be generally applied to an induction electric winding formed by stacking disc windings on the above, and similarly excellent effects can be obtained.

On the other hand, FIG. 8 is a graph showing the relationship between the cross-sectional area of the communicating portion of the closing plate and the flow rate rising in the vertical cooling passage.
As shown in FIG. 8, the cross-sectional area of the communicating portions of the second inner and outer closed slopes 12 and 13 in the third embodiment or the inner and outer closed slopes 10 and 11 in the fourth embodiment has a vertical cooling area. If less than 10% of the cross-sectional area of paths 8 and 9,
The insulating fluid flows too much into the horizontal cooling passages 5 and becomes difficult to flow above the vertical cooling passages 8 and 9. On the contrary, when the cross-sectional area of the communicating portion of the closing plate exceeds 50% of the cross-sectional area of the vertical cooling passages 8 and 9, the insulating fluid flows too much above the vertical cooling passages 5 and the horizontal cooling passages. It becomes difficult to flow to 5. Therefore, in either case, it becomes impossible to appropriately control the flow rates of the upper cooling channels 8 and 9 and the horizontal cooling channel 5. Therefore, from FIG. 8, the cross-sectional area of the communicating portion of the closing plate is 10% of the cross-sectional area of the vertical cooling passages 8 and 9.
It is understood that the flow rate flowing to the upper part of the closing plate and the flow rate flowing to the horizontal cooling passage can be appropriately controlled by limiting the range to 50%.

[0051]

As described above, according to the present invention,
It is possible to increase the flow velocity of the horizontal cooling passage near the inflow port in the cooling area to make the flow velocity distribution uniform among the plurality of horizontal cooling passages, and to provide a small induction electric winding with excellent cooling efficiency. .

[Brief description of drawings]

1 is a cross-sectional view showing a winding of a transformer according to a first embodiment of the present invention, which is a cross-sectional view taken along arrow X in FIG.

FIG. 2 is a plan view of FIG.

FIG. 3 is a graph showing a flow velocity distribution of a plurality of horizontal cooling paths 5 in the cooling areas 21 to 24 of FIG.

FIG. 4 is a sectional view showing windings of a transformer according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing windings of a transformer according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing windings of a transformer according to a fourth embodiment of the present invention.

FIG. 7 is a sectional perspective view showing windings of a transformer according to a fifth embodiment of the present invention.

FIG. 8 is a graph showing the relationship between the cross-sectional area of the communicating portion of the closing plate and the flow rate rising in the vertical cooling passage.

FIG. 9 is a plan view showing an example of windings of a conventional transformer.

10 is a cross-sectional view taken along arrow Y of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inner insulating cylinder 2 ... Outer insulating cylinder 3 ... Disc winding 4 ... Horizontal spacing piece 5 ... Horizontal cooling passage 6 ... Inner vertical spacing piece 7 ... Outer vertical spacing piece 8 ... Inner vertical cooling passage 9 ... Outer vertical cooling passage 10 ... Inner closing plate 10a, 11a, 12a, 13a, 14a ... Communication part 11, 14 ... Outer closing plate 12 ... Second inner closing plate 13 ... Second outer closing plate 20 ... Flow velocity distribution 21-26 ... Cooling area

Claims (5)

[Claims] 1. A plurality of disc windings are stacked and arranged between an inner insulating cylinder and an outer insulating cylinder, and a plurality of horizontal spacing pieces are interposed between adjacent disc windings. A horizontal cooling path is formed radially, and a plurality of vertical spacing pieces are respectively interposed between the inner insulating cylinder and the disk winding and between the outer insulating cylinder and the disk winding. A plurality of inner vertical cooling passages and a plurality of outer vertical cooling passages that respectively communicate the plurality of horizontal cooling passages are formed, and at least a part of the plurality of horizontal cooling passages is covered with an insulating fluid. in the configuration the induction apparatus winding to flow from the line inside toward the outside, the spacing dimension S _I between the inner insulation cylinder of the inner vertical cooling path and the disc windings, the outer vertical cooling path wherein an outer insulating tube and the spacing dimension S _O between the disc windings of Induction apparatus winding engagement is characterized by being configured such that S _I> S _O. 2. A plurality of stages of disk windings are stacked and arranged between the inner insulating cylinder and the outer insulating cylinder, and a plurality of horizontal spacing pieces are interposed between adjacent disk windings. A horizontal cooling path is formed radially, and a plurality of vertical spacing pieces are respectively interposed between the inner insulating cylinder and the disk winding and between the outer insulating cylinder and the disk winding. A plurality of inner vertical cooling passages and a plurality of outer vertical cooling passages, which communicate with the plurality of horizontal cooling passages, respectively, are formed, and the inner vertical cooling passages are closed by closing the inner vertical cooling passages for each plurality of stages of the disk winding. An inner closing plate extending from the passage to the horizontal cooling passage, and an outer closing plate closing the outer vertical cooling passage to extend from the outer vertical cooling passage to the horizontal cooling passage, alternately, and It is provided around the entire circumference of the disc winding, and this inner blocking plate and outer blocking A plurality of cooling zones are formed by, and the induction electric wire winding is configured to flow the insulating fluid in a zigzag manner in a manner that reverses the flow direction for each cooling zone, in the cooling zone located below the inner blocking plate. A second inner closing plate extending from the inner vertical cooling passage to the horizontal cooling passage, the second inner closing plate having a communicating portion for communicating a part of the inner vertical cooling passage. A second portion extending from the outer vertical cooling passage to the horizontal cooling passage in a cooling area located below the outer closing plate, the second cooling portion being configured to close the inner vertical cooling passage at a portion other than the communication portion. Outer closing plate is provided, and the second outer closing plate has a communicating portion that allows a part of the outer vertical cooling passage to communicate with each other, so that the portion other than the communicating portion closes the outer vertical cooling passage. Induction characterized by being constructed Utsuwamakisen. 3. A plurality of stages of disk windings are stacked and arranged between the inner insulating cylinder and the outer insulating cylinder, and a plurality of horizontal spacing pieces are interposed between adjacent disk windings. A horizontal cooling path is formed radially, and a plurality of vertical spacing pieces are respectively interposed between the inner insulating cylinder and the disk winding and between the outer insulating cylinder and the disk winding. A plurality of inner vertical cooling passages and a plurality of outer vertical cooling passages, which communicate with the plurality of horizontal cooling passages, respectively, are formed, and the inner vertical cooling passages are closed by closing the inner vertical cooling passages for each plurality of stages of the disk winding. An inner closing plate extending from the passage to the horizontal cooling passage, and an outer closing plate closing the outer vertical cooling passage to extend from the outer vertical cooling passage to the horizontal cooling passage, alternately, and It is provided around the entire circumference of the disc winding, and this inner blocking plate and outer blocking A plurality of cooling zones are formed by each of the cooling zones, and the insulating fluid is zigzagly flowed in a reverse direction in each cooling zone, wherein the inner blocking plate is one of the inner vertical cooling channels. A communication part that communicates the parts, and is configured to close the inner vertical cooling path with a part other than the communication part, and the outer closing plate has a communication part that communicates a part of the outer vertical cooling path. The induction electric winding is characterized in that the outer vertical cooling passage is closed at a portion other than the communicating portion. 4. The inner communicating plate of the second inner closing plate or the second outer closing plate, or the communicating part of the inner closing plate or the outer closing plate, the inner vertical cooling path or the outer vertical cooling path. The induction winding according to claim 2 or 3, wherein a plurality of holes having an equivalent cross-sectional area are provided in a portion that crosses the cooling passage. 5. The cross-sectional area of the communication portion of the second inner blocking plate or the second outer blocking plate, or the cross-sectional area of the communication portion of the inner blocking plate or the outer blocking plate is the inner vertical direction. 1 of the cross-sectional area of the cooling channel or the outer vertical cooling channel
The induction electric wire winding according to claim 2 or 3, characterized in that it is in a range of 0% to 50%.