JP2591050Y2 - Transformer winding cooling structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a transformer winding, and more particularly, to uniformly cool a disk winding or a helical winding of a forced circulation system for forcibly circulating and cooling a refrigerant such as insulating oil. The present invention relates to a cooling structure of a folding section system using a baffle plate that performs cooling.

[0002]

2. Description of the Related Art In a conventional forced circulation type transformer,
As shown in FIG. 8, an oil path structure of a disk winding for forcibly circulating a cooling medium such as insulating oil to cool the space between the inner insulating cylinder 52 and the outer insulating cylinder 53 provided on the outer periphery of the iron core. The plate winding 51 is housed, and each coil constituting the disk winding 51 is, for example, 4 to
An inner baffle ring 60 and an outer baffle ring 61 connected to an inner insulating tube 52 and an outer insulating tube 53 are arranged above and below each block, respectively. The refrigerant flowing during
As shown by the arrows, the structure was such that the gas flowed from the outer vertical oil passage 57 to the horizontal ducts R to Z between the coils, and then flowed through the inner vertical oil passage 56.

However, in the conventional oil passage structure as shown in FIG. 8, the flow distribution of each horizontal duct in the winding flow division is as shown in FIG.
As shown in the figure, the flow distribution in the coil block between the inner baffle ring 60 and the outer baffle ring 61 is uniform with respect to the horizontal duct between the baffle ring and the coil and between adjacent coils. Instead, a large amount of flow concentrates on the horizontal duct R closest to the oil outlet of the block, and thereafter, the flow decreases as it approaches the inlet, and there is almost no flow in the horizontal ducts Y and Z near the inlet. Become. For this reason, the temperature of the coil located in the portion where the flow rate is small increases.

FIG. 10 shows the temperature rise distribution of the windings, in which the vertical axis shows the positions of the coils 1 to 9 and the horizontal axis shows the temperature. As is clear from FIG.
There is a disadvantage that the temperature difference between the coils is large, and a large temperature rise occurs particularly near the inlet of the refrigerant.

Japanese Unexamined Utility Model Publication No. Sho 55-6105 has been made to solve the conventional method as shown in FIG. 8, and the structure of Japanese Utility Model Publication No. Sho 55-6105 will be described below with reference to FIGS. I do. As shown in FIG. 11, FIG. 12, and FIG. 13, the disk winding 51 is wound around the outer circumference of the iron core with its inner circumference and outer circumference surrounded by an inner insulating cylinder 52 and an outer insulating cylinder 53, and has a plurality of coils. Are stacked in the axial direction,
These are sequentially connected to each other. A plurality of radial duct pieces 54 extending in the radial direction are provided between each coil.
Are radially arranged and interposed, and the inner and outer ends of each radial duct piece 54 are provided with a plurality of radial duct pieces 54 inserted between the inner and outer circumferences of the disk winding 51 and the inner insulating tube 52 and the outer insulating tube 53. It is fixed to the axial duct rod 55.

[0006] Horizontal oil paths a, b, c, ... are formed between the coils, and the horizontal oil paths a, b, c, ...
Are divided into a plurality of radial oil passages A, B, C,... By a radial duct piece 55, and each of the divided horizontal oil passages A, B, C,. The inner vertical oil path 56 and the outer vertical oil path 57 between the inner and outer circumferences of the disk winding 51 similarly divided by the rod 55 and the inner and outer insulating cylinders 52 and 53 communicate with each other.

In the cooling structure shown in FIG. 11, the circumferential direction of the winding is divided into eight equal parts, and a duct piece 54 is arranged at each position. Therefore, the horizontal oil passages a, b,
are divided into eight places in the circumferential direction on each plane.

The inner baffle plate 62 and the outer baffle plate 63 in FIG. 12 are substantially fan-shaped insulating plates made of an insulating material such as a press board, and have both ends overlapped between the adjacent duct piece 54 and the coil. Supported. The inner baffle plate 62
The outer baffle plate 63 closes one portion of the divided inner vertical oil passage 56 and the outer baffle plate 63 closes one of the divided outer vertical oil passages 57. In this case, the inner baffle plate 62 and the outer baffle plate 63 may have a shape that closes one of the vertical oil passages on the inner and outer circumferences of the winding.
FIG. 11 shows a case where the outer baffle plate 63 is arranged on the divided horizontal oil passage a in the unit coil, and the inner baffle plate 62 is arranged on the horizontal oil passage E at the symmetric position. If these are, for example, horizontal oil passages a, in the lower horizontal oil passage b, the inner baffle plate 62 is connected to the divided horizontal oil passage at the position of the horizontal oil passage B where the outer baffle plate 63 is divided. The baffle insertion position is shifted to a position where the baffle is inserted in a position rotated in a clockwise direction while sequentially moving to a lower horizontal oil passage. That is, as shown by a solid line in FIG. 13, the inner baffle plate 62 and the outer baffle plate 63 are sequentially shifted one by one to the lower horizontal oil passage while being rotated while being mounted.

[0009]

However, in such an oil passage structure, baffles divided into the same number of windings are sequentially shifted in the axial direction, and in this case, the baffles are provided in all stages of the coil. Because of the installation, the pressure loss increases in the application to the large-capacity transformer winding, so that the temperature distribution in each part of the winding may be unbalanced.

The present invention has been made in view of the above points, and further improves the temperature distribution imbalance of each part of the winding.
It is an object of the present invention to provide a transformer winding cooling structure that uniformly cools a winding.

[0011]

Means for Solving the Problems According to the first aspect of the present invention.
In the cooling structure for the transformer windings, the axis of the disc-shaped winding or helical winding between the inner and outer side insulating tube provided on the outer periphery of the core
A predetermined number of stages are stacked and stored in the direction, and a horizontal oil passage is formed between the coils of this winding, and the horizontal oil passage is
To form a radial horizontal oil passage
And a plurality of shafts between the inner and outer circumferences of the winding and the inner and outer insulating cylinders.
Insert a directional duct rod to communicate with each of the horizontal oil passages
The inner and outer vertical oil passages are formed,
A baffle plate that blocks part of the road and changes the flow of refrigerant
The baffle plate is formed by a plurality of adjacent horizontal oil passages.
To block the vertical oil passage outside the serviced section
An outer bag integrated with the outer end of the section duct piece
A part that blocks the vertical oil passage inside the full plate and the receiving section
And the inner end of the duct piece in the section in charge
Inner baffle plate, and these outer baffle plate and inner baffle plate
When the ruffle plates are placed at opposite positions on the same circumference
In both cases, the coils are sequentially suspended between coils separated by a predetermined number of stages in the axial direction.
Arrange while shifting so that the straight oil path is closed in the circumferential direction
Things. In the invention of claim 2, the above
Either the outer baffle plate or the inner baffle plate
Are arranged at one place on the same circumference. That is, the outer buffer
Outer baffle in either direction
Full plate (or inner baffle plate) is placed at one place on the same circumference.
Between the coils placed at predetermined steps in the axial direction
The outer (or inner) vertical oil passages are sequentially blocked in the circumferential direction
Staggered and placed on the outside (or inside) vertical oilway
After the closure is completed, the other inner baffle plate (or outer baffle
Plate) at one location on the same circumference and
Inward (or outside) between coils separated by a predetermined number of steps
Side) Distribute while shifting so that the vertical oil passage closes in the circumferential direction.
Is placed .

[0012]

Since the structure having high cooling efficiency near the outlet of the turning section is arranged in all the stages of the coil, the distribution of the temperature rise of the winding becomes uniform.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan sectional view showing an embodiment of a transformer winding cooling structure according to the present invention. A disk winding 51 is surrounded on its inner and outer circumferences by an inner insulating tube 52 and an outer insulating tube 53. The coil is wound around the outer periphery of the iron core, a plurality of coils are stacked in the axial direction, and these are sequentially connected. A plurality of radial duct pieces 54 extending in the radial direction are radially arranged and interposed between the coils, and the inner and outer ends of each radial duct piece 54 are Inner / outer circumference and inner insulating tube 52 and outer insulating tube 53
It is fixed by a plurality of axial duct rods 55 inserted between them.

The horizontal oil passages A, B, C,... Are formed between the coils, and the horizontal oil passages A, B, C,.
Are divided into a plurality of radial oil passages a, b, c,... By a radial duct piece 54, and each of the divided oil passages a, b, c,. The inner vertical oil path 56 and the outer vertical oil path 57 between the inner and outer circumferences of the disk winding 51 and the inner insulating cylinder 52 and the outer insulating cylinder 53 similarly divided by the rod 55 communicate with each other.

In the cooling structure shown in FIG. 1, the circumferential direction of the winding 51 is divided into 12 equal parts, and duct pieces are arranged at respective positions. Therefore, the horizontal oil passages A, B,
C,... Correspond to 12 of al in the circumferential direction on each plane.
It is divided into places.

The inner baffle plate 58 and the outer baffle plate 5 of FIG.
Reference numeral 9 denotes an insulating plate made of an insulating material such as a press board. The inner baffle plate 58 has a substantially fan-shaped outer shape in which a portion that blocks two adjacent vertical oil passages 56 and three duct piece portions are integrated. The outer baffle plate 59 has a substantially fan-shaped outer shape in which a portion that blocks two adjacent outer vertical oil passages 57 and three duct piece portions are integrated. It is superposed between and supported. The inner baffle plate 58 closes the inner vertical oil passage 56 inside the horizontal oil passages a and b, and the outer baffle plate 59 closes the outer vertical oil passage 57 of the horizontal oil passages h and g. is there.

As described above, the inner baffle plate 58 in the present invention closes a plurality of portions of the divided inner vertical oil passage 56, and the outer baffle plate 59 is formed of the divided outer vertical oil passage 57. Are to be closed at a plurality of locations. In this case, the inner baffle plate 58 and the outer baffle plate 5
9 is one of vertical oil passages 56 and 57 on the inner and outer circumferences of the winding 51.
Any shape may be used as long as the shape is closed.

FIG. 2 is a longitudinal sectional view showing a first embodiment of a transformer winding cooling structure according to the present invention, in which an inner baffle plate 58 and an outer baffle plate 59 are arranged on the same plane in opposite radial directions. In this case, the case where the number of equally distributed receiving sections of the baffle is 2 and the number of stages of coil displacement is 3 is shown. Horizontal duct piece 54
Are equal to 12. (Hereafter, in FIGS. 2 to 5,
The number of coils is 40, and the horizontal oil passages A,
B, C,... Will be described with respect to a case of 12 equidistantly divided into twelve places a to l in the circumferential direction on each plane. The solid line indicates the inner baffle plate 58, and the dotted line indicates the outer baffle plate 5.
9 is shown. ) Inner baffle plate 58 is coil 3
8 and 39 are located at the positions of horizontal oil passages a and b, and then on the three coils are located at the positions of the adjacent horizontal oil passages c and d between the coils 35 and 36, and then rotate sequentially. And the horizontal oil passages a and b between the coils 5 and 6 and finally the horizontal oil passages a and b between the coils 2 and 3 It is arranged until.

Next, the outer baffle plate 59 is connected to the coils 38 and 39.
Are arranged at the positions of horizontal oil passages g and h, and between the coils 35 and 36 on the three coils, and at the positions of the adjacent horizontal oil passages i and j. It is arranged for every adjacent horizontal oil passage on the coil, and finally at the position of the horizontal oil passages e and f between the coils 5 and 6, and next to the horizontal oil passage g between the coils 2 and 3.
And h.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the transformer winding cooling structure according to the present invention, in which an inner baffle plate 58 and an outer baffle plate 59 are arranged on the same plane in opposite radial directions. In this case, the number of equally distributed sections of the baffle is 3 and the number of coil displacement stages is 3.

An inner baffle plate 58 is located in the horizontal oil passages a, b and c between the coils 38 and 39 and then the adjacent horizontal oil passages d, e and f between the coils 35 and 36 on the three coils. , And after that, while rotating sequentially, they are arranged at every adjacent horizontal oil passage on the three coils, and finally, the horizontal oil passage j, between the coils 5 and 6,
After the positions of k and l, the horizontal oil passages a and b between the coils 2 and 3
And c.

Next, the outer baffle plate 59 is connected to the coils 38 and 39.
Are arranged at the positions of the horizontal oil passages g, h and i, and then at the positions of the adjacent horizontal oil passages j, k and l between the coils 35 and 36 on the three coils, and thereafter rotated sequentially. While the horizontal oil passages between the coils 2 and 3 are arranged next to the positions of the horizontal oil passages d, e and f between the coils 5 and 6 at the end. , H and i.

FIG. 4 is a longitudinal sectional view showing a third embodiment of a transformer winding cooling structure according to the present invention. In the case where a baffle plate is arranged at one place on the same circumference, the baffle is equally distributed. The case where the number is 2 and the number of coil displacement stages is 2 is shown.

An inner baffle plate 58 is located at the location of the horizontal oil passages a and d between the coils 38 and 39 and then at the location of the adjacent horizontal oil passages c and d between the coils 36 and 37 on the two coils. Are arranged at the positions of the horizontal oil passages e and f next to the coils 34 and 35 on the two coils, and are arranged for each adjacent horizontal oil passage on the two coils while rotating sequentially. , And between the coils 28 and 29 to the horizontal oil passages k and l.

Next, the outer baffle plate 59 is disposed at the position of the horizontal oil passages a and b between the coils 26 and 27 on the two coils,
Next, it is arranged at the position of the adjacent horizontal oil passages c and d between the coils 24 and 25 on the two coils. It is arranged up to the position of horizontal oil passages k and 1 between 17. Next, the inner baffle plate 58 is disposed at the position of the horizontal oil passages a and b between the coils 14 and 15 on the two coils, and thereafter the inner baffle plate 58 is sequentially rotated.
It is arranged for each horizontal oil path on the coil, and finally the coils 6 and 7
Are arranged to the positions of the horizontal oil passages k and l between the coils 4 and 5 next to the positions of the horizontal oil passages i and j between. Next, it is arranged to the position of the adjacent horizontal oil passages a and b between the coils 2 and 3 on the two coils.

FIG. 5 is a vertical sectional view showing a fourth embodiment of the transformer winding cooling structure according to the present invention. In the case where a baffle plate is arranged at one place on the same circumference, the baffle is equally distributed. The case where the number is 4 and the number of coil displacement stages is 4 is shown.

An inner baffle plate 58 is positioned at the horizontal oil passages a, b, c and d between the coils 38 and 39, and then the adjacent horizontal oil passage e between the coils 34 and 35 on the four coils. , F,
Coil 3 which is arranged at the position of g and h, and on 4 coils
The horizontal oil passages i, j, k and l are located between 0 and 31 and the outer baffle plate 59 is then positioned at the horizontal oil passages a, b, c and d between the coils 26 and 27. And then horizontal oil passages e, f, adjacent between coils 22 and 23 on four coils
Coil 1 which is arranged at the positions of g and h and further has 4 coils
8 and 19 are located at the next horizontal oil passages i, j, k and l, and then the inner baffle plate 58
It is located at the location of horizontal oil passages a, b, c and d between 4 and 15 and then at the location of adjacent horizontal oil passages e, f, g and h between coils 10 and 11 on the four coils. And further placed at the location of horizontal oil passages i, j, k and l next to coils 6 and 7 on four coils, then outer baffle plate 59 is attached to coils 2 and 3
Are arranged at positions of horizontal oil passages a, b, c and d.

FIGS. 6 and 7 are winding temperature rise distribution diagrams showing an example of winding temperature rise in the transformer winding cooling structure of the present invention, wherein a coil 1 is disposed between an inner insulating tube 52 and an outer insulating tube 53. FIG. To 9 are arranged. An inner vertical oil passage 56 is disposed inside the coil, and an outer vertical oil passage 5 is provided outside the coil.
7 are arranged. An inner baffle plate 58 is arranged below the coil 9, and an outer baffle plate 59 is arranged above the coil 1.
However, as shown in FIG. 7, the temperature rise in the windings from the coil 9 near the inflow of the refrigerant to the coil 1 near the outlet is almost uniform.

Although the embodiment of the present invention has been described with respect to a disk winding, it is a matter of course that the same effect can be expected when the winding 51 is a helical winding.

[0031]

As described above, in the transformer winding cooling structure according to the present invention, the outer baffle plate closing the plurality of adjacent outer vertical oil passages and the plurality of adjacent inner vertical oil passages are formed. The inner baffle plate to be closed is separated in a plurality of stages in the axial direction so as to alternately close the inner and outer vertical oil passages, and the mounting position of each of the outer baffle plate and the inner baffle plate is sequentially changed by a plurality of coil stages in the axial direction. Since it is provided at a position shifted by every minute and sequentially rotated in the circumferential direction, (1) Since a structural portion having high cooling efficiency near the exit of the folding section can be arranged at all stages of the coil, local heating of the winding is reduced. Is suppressed.

(2) The temperature of the winding is made uniform.

(3) An efficient cooling structure can be set irrespective of the capacity of the transformer by a combination of the size of the baffle plate (the number of equal distributions) and the number of stages of displacement of the coil.

Such excellent effects as described above are obtained.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing an embodiment of a cooling structure of a transformer winding according to the present invention.

FIG. 2 is a longitudinal sectional view showing the first embodiment of the present invention.

FIG. 3 is an explanatory longitudinal sectional view showing a second embodiment of the present invention.

FIG. 4 is an explanatory longitudinal sectional view showing a third embodiment of the present invention.

FIG. 5 is an explanatory longitudinal sectional view showing a fourth embodiment of the present invention.

FIG. 6 is a sectional view showing an example of the cooling structure of the present invention.

FIG. 7 is a winding temperature rise distribution diagram showing an example of a winding temperature rise according to the present invention.

FIG. 8 is a cross-sectional view showing a conventional transformer winding cooling structure.

FIG. 9 is a flow distribution diagram showing a flow distribution in a horizontal duct of a winding in a conventional transformer winding cooling structure.

FIG. 10 is a winding temperature rise distribution diagram showing a winding temperature rise distribution in a conventional transformer winding cooling structure.

FIG. 11 is a cross-sectional plan view showing a conventional transformer winding cooling structure.

FIG. 12 is a plan view showing the shape of a baffle plate in a conventional transformer winding cooling structure.

FIG. 13 is an explanatory longitudinal sectional view showing an example of a conventional transformer winding cooling structure.

[Explanation of symbols]

 1-10: coil 51: winding 52: inner insulating cylinder 53: outer insulating cylinder 54: duct piece 55: axial duct rod 56: inner vertical oil path 57: outer vertical oil path 58: inner baffle plate 59: outer baffle Plates 1-9: Coil A, B, C: Horizontal oil path a, b, c: Horizontal oil path

Claims (2)

(57) [Scope of request for utility model registration] 1. A disk-shaped winding or a helical winding is stacked in a predetermined number of stages in an axial direction between inner and outer insulating cylinders provided on an outer periphery of an iron core.
A horizontal oil passage between the coils of this winding
Is formed, and the horizontal oil passage is divided into a plurality of parts by a radial duct piece.
Split to form radial horizontal oil passages, and insert a plurality of axial duct rods between the inner and outer circumferences of the windings and the inner and outer insulating cylinders to connect the inner and outer vertical oil passages to the respective horizontal oil passages. to form the road
And block a part of the inner and outer vertical oil passages
A baffle plate that changes the flow of the
External hanging of the service section formed by a plurality of adjacent horizontal oilways
Outside the duct piece in the section that blocks the straight oil passage and the section in charge
Outer baffle plate and integral section integrated with end
Section of the vertical oil passage inside the
An inner baffle plate with the inner end of the
Place these outer and inner baffle plates on the same circumference.
At opposite positions, and a predetermined step in the axial direction.
Vertical oil passages are sequentially blocked in the circumferential direction between coils
A cooling structure for windings of transformers, characterized in that they are arranged so as to be shifted . 2. A circle between inner and outer insulating cylinders provided on an outer periphery of an iron core.
Stacking disk-shaped or helical windings in the specified number of stages in the axial direction
A horizontal oil passage between the coils of this winding
Is formed, and the horizontal oil passage is divided into a plurality of parts by a radial duct piece.
Split to form a radial horizontal oil path, with the inner and outer circumference of the winding
Insert multiple axial duct rods between the inner and outer insulating cylinders
Forming a plurality of inner and outer vertical oil passages communicating with the respective horizontal oil passages
And block a part of the inner and outer vertical oil passages to cool
A baffle plate that changes the flow of the medium is provided, and this baffle plate
Outside of the service section formed by the adjacent horizontal oilways
Duct block in the section that blocks the vertical vertical oilway and the section in charge
Outer baffle plate integrated with outer end of
The blockage of the vertical oilway inside the section and the
An inner baffle plate that is integrated with the inner end of the tope
And either one of these outer and inner baffle plates
Same outer baffle plate (or inner baffle plate) in one direction
It is arranged at one place on the circumference and has a predetermined number of steps in the axial direction.
Outer (or inner) vertical oil passages between coils
Displace it so that it blocks in the circumferential direction, and
Is inside) After the blockage of the vertical oil passage is in order, the other inner buffer
(Or outer baffle plate) at one location on the same circumference
And between the coils separated by a predetermined number of stages in the axial direction.
So that the inner (or outer) vertical oil passages sequentially block in the circumferential direction
The cooling of the transformer winding characterized by being shifted
Restructure .