JPH09199345A - Transformer winding - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To insert a flow diversion plate near the center of the flow diversion section in the winding of an SF ₆ gas insulated transformer consisting of a disc winding or a helical winding in which a flow diversion plate is inserted in the axial direction. To make the flow distribution of the insulating cooling medium in the horizontal duct uniform, reduce the maximum winding temperature, and make the temperature rise distribution uniform. SOLUTION: For a bent flow area in which a plurality of disk windings or helical windings 1 are inserted in the axial direction, the amount of a cooling medium flowing in a horizontal duct 5 near a bent flow plate 7a forming an inlet is increased. For dividing the flow dividing plate 11 into the vertical duct 4'on the inlet side.
And the return plate 12 is provided so as to project to the outlet-side vertical duct 4, so that the cooling medium can flow in the direction opposite to the horizontal duct adjacent to the horizontal duct behind the flow dividing plate in which the flow easily stagnates. Yes, all of them are horizontal ducts, and the flow rate required for cooling can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer winding,
In particular, the present invention relates to a transformer winding that is composed of a disc-shaped winding or a helical winding and is suitable for a forced circulation cooling SF ₆ gas-insulated transformer.

[0002]

2. Description of the Related Art For disaster prevention, there is a strong demand for non-combustible transformers installed in cities, and there is also a strong demand for larger capacity and smaller size. As a transformer using non-flammable insulating cooling medium, SF
_{There are 6} gas insulation transformers, but SF ₆ gas has density, specific heat,
Since the physical properties relating to the cooling performance such as thermal conductivity are smaller than those of the liquid insulating cooling medium, the cooling performance is poor and the dielectric strength is also small. Therefore, while a large volume flow of SF ₆ gas, which is an insulating cooling medium, is made to flow, the insulating distance in the transformer winding,
That is, the dimension of flowing the insulating cooling medium such as the vertical duct or the horizontal duct is increased.

As the structure of the transformer winding, in the case of a disk winding in which a wire is wound in a disk shape around an iron core or a helical winding in a spiral shape, the inner side in the radial direction of the winding. , And vertical spacers are provided on the outside along the insulating cylinder to provide vertical ducts, and in the axial direction of the disk-shaped winding, horizontal spacers are inserted between the winding stages to form horizontal ducts. With
A plurality of folding plates are inserted in the axial direction of the winding to form a folding region, the openings of the folding plates are alternately provided inside and outside in the radial direction of the winding, and the insulating cooling medium flows in the axial direction. Accordingly, the direction of the radial flow in the windings alternates between the different flow zones.

With such a structure, the volumetric flow rate of the cooling medium is large, and when the cross-sectional area of the horizontal duct through which the insulating cooling medium flows is large, the cooling medium is large in the upper (downstream) horizontal duct in the mixed flow area. Flow tends to flow less into the lower horizontal duct. Therefore, there is a large difference in the temperature rise distribution of the winding, and the maximum temperature rise of the winding tends to be higher than the average temperature rise of the winding.

From the above, in order to improve the gas flow in the winding, the radial width of the vertical duct along the insulating tube is increased (see Japanese Patent Laid-Open No. 4-168707). In addition to the vertical duct, a vertical duct (gas duct) penetrating in the axial direction is provided near the radial center of the winding (see Japanese Patent Laid-Open No. 52-43937), and the radial dimension and position of this duct. There is also a method of making the winding different for each winding stage (for example, JP-A-53-40820 and JP-A-54-3).
No. 4025 bulletin).

[0006]

However, in this structure, a large amount of gas flows in the vertical duct along the insulating cylinder having a low flow resistance, and the vertical duct or the horizontal duct near the radial center of the winding. The flow rate of the gas flowing through the coil is relatively small, and the effect of reducing the temperature rise of the winding is small. Further, when the radial width of the vertical duct is increased or the gas duct is provided, the dimension of the winding in the radial direction increases, and the volume of the transformer increases as a whole. Also, if the radial position of the gas duct is made different for each stage of the winding, the number of branching and joining points in the flow of the cooling medium increases, the pressure loss of the cooling medium increases, the flow rate of the cooling medium decreases, or A large blower is required. In particular, transformers installed in urban areas are strongly required to be miniaturized, so that it is necessary to miniaturize windings.

[0007] The present invention has been made in view of the above points,
The purpose is to make the flow distribution of the insulating cooling medium flowing in the horizontal duct uniform to prevent local heating, to make the temperature rise distribution uniform, and to make the entire winding compact and reduce the temperature rise. To provide a transformer winding that can

[0008]

[Means for Solving the Problems] The above object is to provide a plurality of rectifying plates alternately open inside and outside in the axial direction of the entire disk-shaped winding or helical winding with an insulating cylinder as a partition around the iron core leg. A structure that restricts the amount of the cooling medium flowing in the vertical duct among the insulating cooling mediums flowing in from the inlet side of the plurality of flow-flow areas formed by inserting the insulating cooling medium into the horizontal duct ( An insulating material which is provided so that at least a part thereof projects to the vertical duct on the inlet side, and which flows through the vertical duct on the outlet side at a position closer to the outlet of the flow diverting area than the structure (flow dividing plate). This is achieved by providing another structure (reflow plate) for flowing a part of the cooling medium through the horizontal duct to the vertical duct on the inlet side such that at least a part thereof projects to the vertical duct on the outlet side.

In particular, the flow dividing plate and the return flow plate are formed of plate-shaped members, and are separated from the flow dividing plate by only two to three unit windings,
It is effective to place a return plate near the outlet.

Further, in at least a part of the horizontal ducts in the range of approximately 1/4 to 3/4 from the inlet in the flow diverting area, the inlet is in the direction opposite to the adjacent horizontal duct, that is, from the outlet side vertical duct. Side vertical duct, the cooling medium is made to flow, and in most other horizontal ducts, the cooling medium is made to flow from the inlet side vertical duct to the outlet side vertical duct. The same applies when a "flow control projection" is provided, which has the effect of bending a part of the flow of the above into a horizontal duct.

As in the conventional case, when there is no flow dividing plate and no return flow plate, the horizontal direction around the first unit winding to the third unit winding (depending on the width of the vertical duct) on the downstream side of the flow dividing plate. The flow of the insulating cooling medium stagnates in the duct, and the insulating cooling medium having a flow rate higher than that required for cooling flows downstream of the flow stagnant portion. For this reason, local overheating of the winding occurs at the flow stagnation portion and its periphery.

[0012] However, when the above-mentioned configuration of the present invention is used and the flow dividing plate and the return flow plate are used,
First, in the vicinity of the flow dividing plate, a part of the cooling medium that flows along the vertical duct is made to flow into the horizontal duct where the flow is stagnant, and the flow rate required to cool the horizontal duct that is closer to the inlet than the flow dividing plate is secured. it can. Further, a part of the flow of the cooling medium is blocked by the flow dividing plate, and the flow rate that has flowed more than the amount required for cooling can be reduced downstream thereof. Therefore, the flow rate distribution of the cooling medium in each horizontal duct on the downstream side of the flow distribution plate is made uniform as a whole. In addition, since the return plate has a function of forcibly flowing the cooling medium flowing through the outlet side vertical duct to the inlet side vertical duct, it is generated when the flow dividing plate is used alone (downstream side) 2 behind the flow dividing plate. It is possible to avoid the flow stagnation in the three horizontal ducts. The flow rate of the cooling medium can be made relatively uniform in all the horizontal ducts, and the temperature rise of each winding is also made uniform as compared with the case where there is no diversion plate and no return plate. As a result, the reliability of the insulator can be improved and the life of the insulator can be extended. Further, since the cooling medium can be flowed relatively uniformly in each horizontal duct, the flow rate of the cooling medium can be effectively used for winding cooling.

Since the flow control protrusions arranged on the outlet side vertical duct have a function of forcibly flowing the cooling medium flowing through the outlet side vertical duct to the inlet side vertical duct, the flow control protrusions may be used instead of the return flow plate. The same effect is obtained as in the case of using the flow dividing plate and the returning plate.

When the number of unit windings included in one bent-flow area is large, the flow rate of the cooling medium decreases in the horizontal duct at the rear (downstream side) of the return plate, and the temperature of the unit winding in the vicinity increases. Can be large. In this case, by providing a plurality of sets of the flow diverter plate and the return flow plate in one fold area,
Introducing more cooling medium into the horizontal duct where the flow rate is insufficient,
It is possible to further reduce the variation in the flow rate of each horizontal duct when one set of the flow dividing plate and the return flow plate is used.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the transformer winding of the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a schematic sectional view of a winding portion, and FIG. 2 is a perspective view of the winding portion.

In FIG. 1, 1 is a winding wire, 2 is an inner peripheral side insulating cylinder, and 2'is an outer peripheral side insulating cylinder. Reference numeral 3 is a unit winding, which is wound in a disk shape between the inner peripheral side insulating cylinder 2 and the outer peripheral side insulating cylinder 2 '. 6a, 6b and 6c are flow diverting plates, and a plurality of flow fold plates are arranged in the axial direction of the winding 1 to form flow fold sections 8a and 8b. The folding plates 6a, 6b and 6c are alternately arranged in the radial direction in the inflow / outflow portion 7
a, 7b, 7c, the insulating cooling medium enters the flow diverting sections 8a, 8b through this inlet. In a certain fold flow area, there are an inner vertical duct 4 and an outer vertical duct 4'on the inner and outer sides of the winding. The width (radial direction) of the inner vertical duct 4 is 22 mm
The width (radial direction) of the outer vertical duct 4'is 25 mm.

Regarding the flow diverting section 8a, a part of the horizontal duct 5 is extended to the outer vertical duct 4'between the fourth and fifth unit windings 3 (downstream) above the flow diverting plate 6a to divide the flow. A plate (structure) 11 is provided. The flow distribution plate 11 has a thickness of 2 mm and a width of 40 mm, and the space between the flow distribution plate 11 and the outer insulating cylinder 2'is 6 mm
And Further, between the sixth and seventh unit windings 3 above the folding plate 6a, a return plate (another structure) 12 is provided so as to partially project from the horizontal duct 5 to the inner vertical duct 4. There is. The return plate 12 has a thickness of 1.5 mm and a width of 40 mm, and the distance from the inner peripheral insulating cylinder 2 is 8 mm. In addition, the flow break area 8b
With regard to the above, a flow dividing plate 11 is provided between the fourth and fifth unit windings 3 above (downstream) the flow diverting plate 6b so as to partially project from the horizontal duct 5 to the inner vertical duct 4.
Between the 6th and 7th unit windings 3 above the fold plate 6b,
A return plate 12 is provided so as to partially project from the horizontal duct 5 to the outer vertical duct 4 '. Fold plate 6a, 6b,
6c, the dimensions of the flow distribution plate 11, and the distance between the insulation pipes 2 and 2'are the same as those of the fold flow area 8a.

A method of fixing the return plate 12 will be described with reference to FIG. In the figure, an inner vertical spacer 9 is arranged adjacent to the inner peripheral insulating cylinder 2 and an outer vertical spacer 9'is arranged adjacent to the outer peripheral insulating cylinder 2'at equal intervals in the circumferential direction. The horizontal spacers 10 are attached to the vertical spacers 9 and 9'to keep the unit windings 3 at constant intervals in the height direction. In this figure, the return plate 12 is an outer vertical spacer 9 '.
However, since it is sandwiched between the two horizontal spacers 10, it is firmly fixed by the weight of the winding wire.

In the winding having such a structure, the insulating cooling medium enters the first-stage flow diverting area 8a from the inflow / outflow portion 7a, rises in the outer vertical duct 4 ', and is located at the flow dividing plate 11 in the outer vertical duct. 4'is flowed as it is, and one flowing in the horizontal duct 5 between the flow dividing plate 6a and the flow dividing plate 11 is branched. The insulating cooling medium that has passed through the horizontal duct 5 rises in the inner vertical duct 4, but at the recirculation plate 12, it flows through the inner vertical duct 4 as it is, and the horizontal duct 5 is directed toward the outer vertical duct 4 '(neighborhood). (In the opposite direction to the flow in the horizontal duct 5) of the horizontal duct.

At the flow dividing plate 11, the insulating cooling medium that has just flowed through the outer vertical duct 4'flows through the horizontal duct 5, passes through the inner vertical duct 4, and then flows through the second vertical flow section 8 of the second stage.
It reaches the inflow / outflow part 7b of b. In the mixed flow area 8b, the insulating cooling medium repeatedly branches and merges in the same manner as in the mixed flow area 8a and reaches the inflow / outflow portion 7c.

FIG. 3 shows a flow break area 8 in the embodiment of FIG.
It is a figure which shows the flow velocity in each horizontal duct center part of b. The flow velocity of the present embodiment is indicated by a solid arrow, and the flow velocity of the conventional example in which the flow dividing plate and the return flow plate are not provided is indicated by a dashed arrow. The sign of the flow velocity is positive when it flows from left to right in FIG. The number at the left end is the stage number of the unit winding 3.

As is apparent from the figure, in the conventional example, the flow velocity is almost stagnant at about 0.1 m / s above and below the unit winding of the third stage, and the heat removal from the winding is insufficient. Local overheating occurred in the unit winding.

On the other hand, in the present embodiment, whichever unit winding is considered, the average flow velocity of the upper and lower horizontal ducts is 1 m / s or more, which is almost sufficient for cooling the winding. Further, since the flow velocity of the horizontal duct in which a larger amount of cooling medium is flowing than necessary can be reduced to some extent, the flow velocity distribution of each horizontal duct can be made uniform, and the variation in the temperature rise of the unit windings can be significantly reduced.

This is shown by test data. The test apparatus is composed of a container accommodating the winding of FIG. 1, a cooler, a blower, various measuring instruments, piping, etc., and a cooling medium (SF ₆ gas) is circulated. The winding has a width of 28 mm,
A heater and a thermocouple are embedded in a copper wire with a height of 14.5 mm, an insulating film is wound to form a simulated conductor, and a plurality of the conductors are arranged to form a unit winding 3, and a folded wire composed of a pair of bent plates 6a, 6b, etc. Eleven unit windings per area were formed by stacking them in the height direction via horizontal spacers. A cooling characteristic test was carried out with and without a flow dividing plate and a reflow plate inserted in the winding. The test method was performed by flowing a predetermined current through a heater embedded in the simulated conductor to generate heat, circulating SF ₆ gas as a cooling medium with a blower, and measuring the temperature of the simulated conductor.

FIG. 4 is a temperature rise characteristic diagram showing an example of the test results, in which the cooling medium pressure is 0.6 MPa and the heat generation density 31 of the winding is 31
The size of the winding is 6 kW / m ³ , and the dimensions of the winding are a flow path length (horizontal direction) of 147 mm, a horizontal duct height of 4.5 mm, an inner vertical duct width of 22 mm, and an outer vertical duct width of 25 mm. The abscissa of FIG. 4 shows the average temperature rise of each simulated unit winding from the gas temperature at the entrance of the flow-divided section, and is shown for the flow-divided area 8b of FIG. The vertical axis is the number in the height direction of the unit winding from the winding plate 6b of the same winding.

In FIG. 4, the mark ○ indicates the result when the flow dividing plate and the return flow plate are present, and the mark Δ indicates the result when the flow dividing plate and the return flow plate are not provided. As is clear from the figure, the maximum temperature rise of the unit winding was reduced by about 50% when the flow dividing plate and the return flow plate were provided, compared with the case where the flow dividing plate and the return flow plate were not provided.

FIG. 5 is a schematic partial sectional view of a winding of a transformer winding according to a second embodiment of the present invention. Similarly to the embodiment of FIG. 1, the winding portion of this embodiment is also composed of the winding 1, the insulating cylinders 2 and 2 ', the vertical ducts 4 and 4', the flow dividing plate 11, the return flow plate 12 and the like.

In this embodiment, the width of the inner vertical duct 4 is 42
1 mm, the width of the outer vertical duct 4'is 45 mm, which is about twice the width of the embodiment of FIG. In the case of the flow diverting section 8b, in the case where there is no flow diverting plate and the flow returning plate, the flow velocity of the cooling medium is 0.1 m / s in the upper and lower horizontal ducts surrounding the unit winding 3 closest to the flow diverting plate 6b. To the extent
Almost stagnant.

Therefore, the flow dividing plate 11 is formed from the flow dividing plates 6b to 3b.
It was installed between the second and fourth unit windings so that the insulating cooling medium could smoothly flow in the horizontal duct between the flow dividing plate 11 and the flow dividing plate 6b. Flow distribution plate 11 and inner peripheral insulating cylinder 2
The distance between the two was 6 mm. The return flow plate 12 is formed from the flow distribution plates 6b to
It was installed between the third and sixth unit windings, and the distance between the return plate 12 and the outer peripheral insulating cylinder 2'was 8 mm. Folding plates 6b to 4
In the upper horizontal ducts of the 5th and 5th unit windings, the flow goes from the outer vertical duct 4'to the inner vertical duct 4, but in most other horizontal ducts, from the inner vertical duct 4 to the outer vertical duct 4 '. Flowing. In this embodiment, no matter which unit winding is focused, the average flow velocity of the upper and lower horizontal ducts is 1
m / s or more, and the flow velocity is almost sufficient for cooling the winding.

The effect is shown by test data. The test apparatus and test method are the same as those in the embodiment of FIG. FIG. 6 is a temperature rise characteristic diagram showing an example of the test results. The test conditions are: cooling medium pressure 0.6 MPa, heat generation density 316 kW / m ^{3 of the} winding.
In addition, the dimension of the winding is 147m in the flow path length (horizontal direction).
m, horizontal duct height 4.5mm, inner vertical duct width 42mm
The outer vertical duct width is 45 mm. The horizontal axis of FIG. 6 is the average temperature rise of each simulated unit winding from the inlet gas temperature of the mixed flow area. The vertical axis is the number in the height direction of the unit winding from the flow rectifying plate 6b.

In FIG. 6, the mark ○ indicates the result when there is a flow dividing plate and the return flow plate, and the mark Δ indicates the result when the flow dividing plate and the return flow plate are not provided. As is clear from the figure, in the case where the flow dividing plate and the return flow plate are provided, compared to the case where the flow dividing plate and the return flow plate are not provided,
The maximum temperature rise of the unit winding was reduced by about 65%.

FIG. 7 is a schematic sectional view of a winding part of a third embodiment of the transformer winding of the present invention. The winding part of this embodiment also
Similar to the embodiment of FIG. 1, the winding 1, the insulating cylinders 2 and 2 ′, the vertical ducts 4 and 4 ′, the flow dividing plate 11 and the like are included.
The difference is that the flow control protrusion 13 is provided on the insulating cylinders 2 and 2'instead of 2. Regarding the fold area 8a,
The flow control protrusion 13 faces the seventh unit winding from the flow rectifying plate 6 a and is arranged in contact with the inner peripheral side insulating cylinder 2.

FIG. 8 is a perspective view showing the shape of the flow control protrusion 13 in the embodiment of FIG. The cross-sectional shape of the flow control protrusion 13 along the flow of the vertical duct is a triangle, and the angle between the bottom of the triangle in contact with the inner peripheral insulating cylinder 2 and the lower side (inflow side) is 45 degrees. The angle formed by the upper hypotenuse (outflow side) was also 45 degrees. The height of this triangle is 12mm.
And The flow control protrusion 13 pours a part of the insulating cooling medium flowing upward in the inner vertical duct 4 into the upper horizontal duct 5 of the fifth and sixth unit windings 3 from the flow fold plate 6 a, and then from the inner vertical duct 4. Since the outer vertical duct 4'can flow, a flow velocity of 1 m / s or more can be obtained in the upper and lower horizontal ducts 5 of all the unit windings 3 as in FIG. 1, and the maximum temperature rise of the unit windings 3 is 11 and the flow control protrusion 13 were not provided, there was an effect of being reduced by about 50%.

Although each of the embodiments shown in FIGS. 1, 5 and 7 shows the case where one winding region includes 11 unit windings, the number of unit windings 3 is further increased. In the case of a large number, by providing a plurality of sets of the flow dividing plate 11 and the return flow plate 12, among the horizontal ducts 5 which are approximately in the range of ¼ to 3/4 from the inlet of the flow diverting area, from the outlet side vertical duct. Insulating cooling medium flows toward the inlet side vertical duct at multiple locations,
Since the flow is made uniform, the same effect as that of the above-described embodiment is obtained.

[0035]

According to the above-described transformer winding of the present invention, a plurality of folds are formed in the axial direction of the disk-shaped winding or the helical winding with the insulating cylinder as a partition around the core leg. The plate limits the amount of the cooling medium that flows through the vertical duct among the insulating cooling medium that flows from the inlet side of the multiple flow areas formed by alternately inserting the inside and the outside and forms the insulating cooling in the horizontal duct. A structure for flowing the medium (flow dividing plate) is provided so that at least a part of the structure overhangs the vertical duct on the inlet side,
Another structure in which a part of the insulating cooling medium flowing through the vertical duct on the outlet side is passed through the horizontal duct to the vertical duct on the inlet side at a position closer to the outlet of the flow diversion area than the structure (flow dividing plate). Since the (reflow plate) is provided so that at least a part thereof projects into the vertical duct on the outlet side, first, a part of the insulating cooling medium flowing along the vertical duct flows near the flow dividing plate. It can flow into a stagnant horizontal duct to secure the flow rate required for cooling the horizontal duct located closer to the inlet than the flow dividing plate.In addition, a part of the flow of the insulating cooling medium is blocked by the flow dividing plate. On the further downstream side, the flow rate that has flowed more than the amount required for cooling can be reduced, so the flow rate distribution of the insulating cooling medium in each horizontal duct on the downstream side of the flow dividing plate is made uniform overall. In addition, since the return flow plate has a function of forcibly flowing the insulating cooling medium flowing through the outlet side vertical duct to the inlet side vertical duct, it occurs when the flow divider plate is used alone (downstream side). It is possible to avoid stagnation of flow in 2 or 3 horizontal ducts, to make the flow rate of the insulating cooling medium relatively uniform in all horizontal ducts, and to increase the temperature of each winding compared to the case where there is no diversion plate and reflow plate. And made uniform.

As a result, the flow distribution of the insulating cooling medium flowing in the horizontal duct is made uniform, local heating is prevented, the temperature rise distribution is made uniform, and the entire winding is miniaturized to reduce the temperature rise. it can.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a transformer winding of the present invention.

FIG. 2 is a partial perspective view showing an embodiment of the transformer winding of the present invention.

FIG. 3 is a diagram showing a flow velocity of a horizontal duct according to a configuration of an embodiment of the present invention in comparison with a conventional one.

FIG. 4 is a temperature rise characteristic diagram showing an example of test results of an example according to the present invention.

FIG. 5 is a partial cross-sectional view showing a second embodiment of the transformer winding of the present invention.

FIG. 6 is a temperature rise characteristic diagram showing an example of test results of the second example according to the present invention.

FIG. 7 is a partial cross-sectional view showing a third embodiment of the transformer winding of the present invention.

FIG. 8 is a perspective view showing the shape of a flow control protrusion used in the third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Winding, 2 ... Inner peripheral side insulating cylinder, 2 '... Outer peripheral side insulating cylinder, 3 ... Unit winding, 4 ... Inner vertical duct, 4' ... Outer vertical duct, 5 ... Horizontal duct, 6a, 6b , 6c ... Flow plate, 7a, 7b, 7c ... Inflow part, 8a, 8b ... Flow area, 9 ... Inner vertical spacer, 9 '... Outer vertical spacer,
10 ... Horizontal spacer, 11 ... Flow distribution plate, 12 ... Return flow plate, 1
3 ... Flow control protrusion.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroyuki Fujita 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Kiyoto Hiraishi 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 Inside the Kokubu Plant of Hitachi, Ltd.

Claims (8)

[Claims] 1. A disk-shaped winding or a helical winding having an insulating cylinder as a partition wall around an iron core leg is axially stacked at regular intervals by a spacer for forming a horizontal duct. A vertical duct is formed by inserting a vertical spacer in the axial direction between the insulating cylinders on both sides, and multiple rectifying plates are inserted in the axial direction of the entire winding with openings inside and outside alternately. In a transformer winding in which a plurality of bent flow areas are formed, and the insulating cooling medium flows in a zigzag shape in the axial direction in the bent flow area, the vertical direction of the insulating cooling medium flowing from the inlet side of the bent flow area is used. While limiting the amount of cooling medium flowing through the duct, at least a part of the structure for flowing the insulating cooling medium is provided in the horizontal duct so as to project to the vertical duct on the inlet side, and from the structure, Near the exit of the diversion area In addition, at least a part of another structure that causes a part of the insulating cooling medium flowing through the vertical duct on the outlet side to flow through the horizontal duct to the vertical duct on the inlet side projects to the vertical duct on the outlet side. A transformer winding characterized by being provided. 2. A disk-shaped winding or a helical winding having an insulating cylinder as a partition around the iron core leg is axially laminated at regular intervals by spacers for forming a horizontal duct. A vertical duct is formed by inserting a vertical spacer in the axial direction between the insulating cylinders on both sides, and multiple rectifying plates are inserted in the axial direction of the entire winding with openings inside and outside alternately. In a transformer winding in which the insulating cooling medium flows in a zigzag shape in the axial direction through a plurality of flow-segmented areas, and a number of approximately 1/4 to 3/4 of the inlet in the flow-segmented area is provided. A part of the horizontal duct in the range is provided with a structure for flowing the insulating cooling medium from the vertical duct on the outlet side through the horizontal duct toward the vertical duct on the inlet side, and one of the other horizontal ducts. From the vertical duct on the inlet side to the vertical duct on the outlet side. A transformer winding characterized in that another structure is provided to flow an insulating cooling medium toward a direct duct. 3. The structure provided so as to project to the inlet side vertical duct and the structure provided so as to project to the outlet side vertical duct are both plate-shaped members. The transformer winding according to Item 1 or 2. 4. The plate-shaped member which is separated from the plate-shaped member protruding into the vertical duct on the inlet side by only two to three unit windings and protrudes into the vertical duct on the outlet side at a position close to the outlet. 4. The transformer winding according to claim 3, wherein the member of FIG. 5. The transformer winding according to claim 3, wherein the plate-shaped member is sandwiched and fixed by the horizontal spacer. 6. A disk-shaped winding or a helical winding having an insulating cylinder as a partition wall around the iron core leg is axially laminated at regular intervals by a spacer for forming a horizontal duct, and the winding and the inside and outside A vertical duct is formed by inserting a vertical spacer in the axial direction between the insulating cylinders on both sides, and multiple rectifying plates are inserted in the axial direction of the entire winding with openings inside and outside alternately. In a transformer winding in which a plurality of bent flow areas are formed, and the insulating cooling medium flows in a zigzag shape in the axial direction in the bent flow area, the vertical direction of the insulating cooling medium flowing from the inlet side of the bent flow area is used. A plate-shaped member that restricts the amount of the cooling medium that flows through the duct and that flows the insulating cooling medium is provided in the horizontal duct such that at least a part of the member overhangs the vertical duct on the inlet side, and the plate-shaped member is provided. From the member of the above At a position close to, a protrusion is provided so as to project a part of the insulating cooling medium flowing through the vertical duct on the outlet side through the horizontal duct to the vertical duct on the inlet side so as to project from the insulating cylinder to the vertical duct on the outlet side. A transformer winding characterized in that 7. A disk-shaped winding or a helical winding is formed around an iron core leg by using an insulating cylinder as a partition wall and is axially laminated by a spacer for forming a horizontal duct at regular intervals. A vertical duct is formed by inserting a vertical spacer in the axial direction between the insulating cylinders on both sides, and multiple rectifying plates are inserted in the axial direction of the entire winding with openings inside and outside alternately. In a transformer winding in which a plurality of bent flow areas are formed, and the insulating cooling medium flows in a zigzag shape in the axial direction in the bent flow area, the vertical direction of the insulating cooling medium flowing from the inlet side of the bent flow area is used. While limiting the amount of cooling medium flowing through the duct, at least a part of the structure for flowing the insulating cooling medium is provided in the horizontal duct so as to project to the vertical duct on the inlet side, and from the structure, Near the exit of the diversion area In addition, at least a part of another structure that causes a part of the insulating cooling medium flowing through the vertical duct on the outlet side to flow through the horizontal duct to the vertical duct on the inlet side projects to the vertical duct on the outlet side. A plurality of sets of a structure provided so as to project to the vertical duct on the inlet side and a set of structures provided so as to project on the vertical duct on the outlet side are provided in one fold area. And transformer winding. 8. A disk-shaped winding or a helical winding around an iron core leg with an insulating cylinder as a partition wall is axially laminated at regular intervals by a spacer for forming a horizontal duct. A vertical duct is formed by inserting a vertical spacer in the axial direction between the insulating cylinders on both sides, and multiple rectifying plates are inserted in the axial direction of the entire winding with openings inside and outside alternately. In a transformer winding in which a plurality of bent flow areas are formed, and the insulating cooling medium flows in a zigzag shape in the axial direction in the bent flow area, the vertical direction of the insulating cooling medium flowing from the inlet side of the bent flow area is used. While limiting the amount of the cooling medium flowing through the duct, a flow dividing plate for flowing the insulating cooling medium is provided in the horizontal duct such that at least a part of the flow dividing plate projects to the vertical duct on the inlet side, and Close to the exit of the diversion area At the position, there is provided a return plate for flowing a part of the insulating cooling medium flowing through the vertical duct on the outlet side through the horizontal duct to the vertical duct on the inlet side so that at least a part thereof projects to the vertical duct on the outlet side. A transformer winding characterized in that