JPH0634222U - Transformer winding cooling structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cooling structure for a transformer winding, which further improves the imbalance in the temperature distribution of each part of the winding and uniformly cools the winding. A winding 51 is housed between inner and outer insulating cylinders 52 and 53, and a plurality of horizontal oil passages are radially formed between a plurality of radial duct pieces 54 between unit coils of the winding 51. The inner and outer circumferences of the winding 51 and the inner and outer insulating cylinders 52,
A plurality of axial duct rods 55 are inserted between them to form a plurality of inner / outer vertical oil passages 56, 57 communicating with the horizontal oil passage, and a plurality of adjacent inner vertical oil passages 56 are closed. Baffle plate 58 and a plurality of adjacent outer vertical oil passages 57
The outer baffle plate 59 that closes the inner and outer vertical oil passages 5
6 and 57 are separated from each other in the axial direction so as to alternately close them, and the mounting positions of the inner baffle plate 58 and the outer baffle plate 59 are sequentially moved in the axial direction by a plurality of coil stages.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling structure for a transformer winding, and in particular, it uses a forced circulation type disk winding or a baffle plate that uniformly cools a helical winding for cooling by forcibly circulating a refrigerant such as insulating oil. The present invention relates to a flow zone type cooling structure.

[0002]

[Prior art]

 In the conventional forced circulation type transformer, the oil passage structure of the disk winding that forcibly circulates and cools the refrigerant such as insulating oil is shown in Fig. 8. The disk winding 51 is housed between the cylinder 52 and the outer insulating cylinder 53, each coil constituting the disk winding 51 is divided into, for example, 4 to 8 blocks, and the inner insulation is provided above and below each block. An inner baffle ring 60 and an outer baffle ring 61, which are respectively connected to the cylinder 52 and the outer insulation cylinder 53, are arranged so that the cooling medium flowing between the inner insulation cylinder 52 and the outer insulation cylinder 53 is outside as indicated by the arrow. The structure is such that the oil flows from the vertical oil passage 57 to the horizontal ducts R to Z between the coils and flows 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 winding section is such that the inner baffle ring 60 and the outer baffle ring as shown in the flow distribution diagram of FIG. The flow distribution in the coil block between the rings 61 is not uniform for the horizontal duct between the baffle ring and the coil and between adjacent coils, and the horizontal duct R closest to the oil outlet of the block A large amount of flow is concentrated in the area, and thereafter the flow decreases as it gets closer to the inlet, and there is almost no flow in the horizontal ducts Y and Z near the inlet. For this reason, the temperature of the coil located in the portion where the flow rate is low becomes high.

FIG. 10 shows the temperature rise distribution of the winding, in which the vertical axis represents the positions of the coils 1 to 9 and the horizontal axis represents the temperature. As is clear from FIG. 10, the temperature difference between the coils is large, and there is a drawback that a large temperature rise occurs especially near the inlet of the refrigerant.

[0005] What is made to solve the conventional method as shown in Fig. 8 is JP-B-55-6105. Hereinafter, the structure of JP-B-55-6105 will be described with reference to Figs. 11, 12 and 13. To do. As shown in FIG. 11, FIG. 12 and FIG. 13, the disc winding 51 is surrounded by an inner insulating cylinder 52 and an outer insulating cylinder 53 on the inner circumference and outer circumference thereof and is wound around the outer circumference of an iron core. Are stacked in the axial direction and these are connected in sequence. A plurality of radially extending duct ducts 54 extending in the radial direction are radially disposed between the coils, and the inner and outer ends of each of the radial duct pieces 54 are provided at inner and outer peripheries of the disc winding 51. It is fixed to a plurality of axial duct rods 55 inserted between the inner insulating cylinder 52 and the outer insulating cylinder 53.

Horizontal oil passages a, b, c, ... Are formed between the coils, and the horizontal oil passages a, b, c ,. The horizontal oil passages I, B, C, ..., Which are divided into a, b, h ,. The inner vertical oil passage 56 and the outer vertical oil passage 57 are communicated between the inner and outer circumferences of the inner insulating cylinder 52 and the outer insulating cylinder 53.

In the cooling structure of FIG. 11, the circumferential direction of the winding is divided into eight equal parts, and the duct pieces 54 are arranged at the respective positions. Therefore, the horizontal oil passages a, b, c, ... Between the coils are divided into eight positions in the circumferential direction on the respective planes.

The inner baffle plate 62 and the outer baffle plate 63 shown in FIG. 12 are substantially fan-shaped insulating plates made of an insulating material such as a press board, and both ends are superposed between the adjacent duct piece 54 and the coil. Supported by. The inner baffle plate 62 closes one part of the inner vertical oil passage 56 divided into a plurality of parts, and the outer baffle plate 63 closes one part of the outer vertical oil passage 57 divided into a plurality of parts. is there. In this case, the inner baffle plate 62 and the outer baffle plate 63 may have a shape that closes one vertical oil passage on the inner and outer circumferences of the winding. Note that FIG. 11 shows the 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 symmetrical position. If these are designated as horizontal oil passages a, for example, in the lower horizontal oil passage b, the outer baffle plate 63 is divided into the positions of the horizontal oil passage b and the inner baffle plate 62 is divided into the divided horizontal oil passages. The position of the baffle is shifted to the lower horizontal oil passage, and the baffle insertion position is shifted to the clockwise position. That is, as shown by the solid lines in FIG. 13, the inner baffle plate 62 and the outer baffle plate 63 are rotated one by one while being sequentially moved to the lower horizontal oil passage.

[0009]

[Problems to be solved by the device]

 However, in such an oil passage structure, the baffles divided into evenly distributed windings are sequentially displaced in the axial direction, but in this case, since baffles are installed in all stages of the coil, large capacity transformers are installed. When applied to the coil winding, pressure loss increases, which may cause an imbalance in the temperature distribution in each part of the winding.

The present invention has been made in view of the above points, and further provides a cooling structure for a transformer winding, which further improves the uneven distribution of temperature distribution in each part of the winding and uniformly cools the winding. The purpose is to do.

[0011]

[Means for Solving the Problems]

 In the transformer winding cooling structure of the present invention, an outer baffle plate that closes a plurality of adjacent outer vertical oil passages and an inner baffle plate that closes a plurality of adjacent inner vertical oil passages are provided. The outer vertical oil passages are alternately separated by a plurality of stages in the axial direction so that the outer baffle plate and the inner baffle plate are sequentially displaced in the axial direction by a plurality of coil stages, and in the circumferential direction. It is characterized in that it is installed in a position that is rotated.

[0012]

[Action]

 Since the structure is constructed as described above, the structural portion having a high cooling efficiency near the outlet of the flow divergence section is arranged in all stages of the coil, so that the winding temperature rise distribution becomes uniform.

[0013]

【Example】

 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 of the present invention, in which a disk winding 51 is surrounded by an inner insulating cylinder 52 and an outer insulating cylinder 53 on the inner and outer circumferences thereof. Is wound around the outer periphery of the iron core, and 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 disposed between the coils, and the inner and outer ends of the duct pieces 54 in the radial direction are connected to the disk winding 51. It is fixed by a plurality of axial duct rods 55 inserted between the inner and outer circumferences and the inner insulating cylinder 52 and the outer insulating cylinder 53.

Horizontal oil passages A, B, C, ... Are formed between the coils, and the horizontal oil passages A, B, C ,. Each of the divided horizontal oil passages a, b, c ... Is divided into the roads a, b, c, ... And the disc winding 51 is also divided by a plurality of axial duct rods 55. The inner vertical oil passage 56 and the outer vertical oil passage 57 are communicated with each other between the inner and outer circumferences of the inner insulating cylinder 52 and the outer insulating cylinder 53.

In the cooling structure shown in FIG. 1, the circumferential direction of the winding 51 is divided into 12 equal parts, and the duct pieces are arranged at the respective positions. Therefore, the horizontal oil passages A, B, C, ... Between the coils are divided into 12 positions a to 1 in the circumferential direction on the respective planes.

The inner baffle plate 58 and the outer baffle plate 59 in FIG. 1 are insulating plates made of an insulating material such as a press board, and the inner baffle plate 58 is a portion that blocks two adjacent inner vertical oil passages 56. The outer baffle plate 59 has a portion that closes two adjacent outer vertical oil passages 57 and three duct piece portions. The integrated outer shape is a fan-shaped E shape and is supported by being piled up between the coils. 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.

As described above, the inner baffle plate 58 according to the present invention closes a plurality of portions of the inner vertical oil passage 56 divided into a plurality of parts, and the outer baffle plate 59 has a plurality of outer vertical oil passages 57 divided therein. It is intended to block multiple locations. In this case, the inner baffle plate 58 and the outer baffle plate 59 may be shaped so as to close one of the vertical oil passages 56 and 57 on the inner and outer circumferences of the winding 51.

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 opposite sides in the same plane in the radial direction. In this case, the number of equally distributed baffle sections is 2 and the number of coil shift stages is 3. The number of equal distributions of the horizontal duct pieces 54 is 12. (Hereinafter, in FIGS. 2 to 5, the number of coils is 40 coils, and the horizontal oil passages A, B, C, ... Between the coils are divided into 12 positions a to 1 in the circumferential direction on the respective planes. The solid baffle plate 58 shows the position of the inner baffle plate 58, and the dotted line shows the position of the outer baffle plate 59.) The inner baffle plate 58 is a horizontal oil passage a between the coils 38 and 39. And b, and next to the horizontal oil passages c and d next to each other between the coils 35 and 36 on the three coils. Then, while rotating in sequence, the next horizontal oil passage on the three coils next to each other. It is located in the oil passage, and finally to the position of the horizontal oil passages k and l between the coils 5 and 6 and then to the position of the horizontal oil passages a and b between the coils 2 and 3.

The outer baffle plate 59 is then placed at the position of the horizontal oil passages g and h between the coils 38 and 39, and next to the adjacent horizontal oil passages i and j between the coils 35 and 36 on the three coils. It is arranged at every horizontal oil passage next to each other on three coils while rotating sequentially, and finally at the position of the horizontal oil passages e and f between the coils 5 and 6 and next to the coil 2. Horizontal oil passage between points 3 and 3 is placed up to the position of g and h.

FIG. 3 is a vertical cross-sectional view showing a second embodiment of the transformer winding cooling structure according to the present invention, in which the inner baffle plate 58 and the outer baffle plate 59 are arranged on opposite sides in the same plane in the radial direction. In this case, the number of equal distribution sections of the baffle is 3 and the number of coil deviations is 3.

Inner baffle plates 58 are arranged in the horizontal oilways a, b and c between the coils 38 and 39, and then the adjacent horizontal oilways d, e and f between the coils 35 and 36 on the three coils. Then, while rotating in sequence, they are arranged for every adjacent horizontal oil passages on the three coils, and finally the position of the horizontal oil passages j, k and l between the coils 5 and 6 is followed by the coil 2. It is arranged to the position of the horizontal oilways a, b and c between the three.

Next, the outer baffle plate 59 is arranged at the position of the horizontal oil passages g, h and i between the coils 38 and 39, and then the adjacent horizontal oil passage j between the coils 35 and 36 on the three coils. , K and l, and after that, while rotating in sequence, they are arranged for each adjacent horizontal oil passage on three coils, and finally for horizontal oil passages d, e and f between coils 5 and 6. Next to the position, the horizontal oil passages g, h and i between the coils 2 and 3 are arranged up to the positions.

FIG. 4 is a vertical cross-sectional view showing a third embodiment of the transformer winding cooling structure according to the present invention. In the case where baffle plates are arranged at one place on the same circumference, the baffle is equally distributed. The figure shows the case where the number is 2 and the number of stages of coil deviation is 2.

An inner baffle plate 58 is arranged at the position of the horizontal oil passages a and d between the coils 38 and 39, and then at the position of the adjacent horizontal oil passages c and d between the coils 36 and 37 on the two coils. Is arranged at the position of the adjacent horizontal oil passages e and f between the coils 34 and 35 on the two coils, and thereafter, while sequentially rotating, for each adjacent horizontal oil passage on the two coils. It is arranged, and is arranged up to the position of the horizontal oil passages k and l between the coils 28 and 29.

The outer baffle plate 59 is then placed at the position of the horizontal oilways a and b between the coils 26 and 27 on the two coils, and then the next horizontal oil between the coils 24 and 25 on the two coils. It is arranged at the positions of the roads c and d, and thereafter, while being sequentially rotated, is arranged for every adjacent horizontal oil passage on the two coils, and is arranged up to the positions of the horizontal oil passages k and l between the coils 16 and 17. Next, the inner baffle plate 58 is arranged at the position of the horizontal oil passages a and b between the coils 14 and 15 on the two coils, and thereafter, while being sequentially rotated, is arranged for each of the horizontal oil passages on the two coils. At the end, the positions of the horizontal oil passages i and j between the coils 6 and 7 are followed by the positions of the horizontal oil passages k and l between the coils 4 and 5. Next, the two horizontal coils are placed up to the positions of the adjacent horizontal oil passages a and b between the coils 2 and 3.

FIG. 5 is a vertical cross-sectional view showing a fourth embodiment of the transformer winding cooling structure of the present invention. In the case where baffle plates are arranged at one location on the same circumference, the baffle is equally distributed. The figure shows the case where the number is 4 and the number of coil shift stages is 4.

An inner baffle plate 58 is arranged at the position of the horizontal oil passages a, b, c and d between the coils 38 and 39, and next to the next horizontal oil passage e between the coils 34 and 35 on the four coils. , F, g, and h, and further adjacent horizontal oil passages between coils 30 and 31 on the four coils, i, j, k, and l, and then the outer baffle plate 59. It is arranged at the positions of horizontal oilways a, b, c and d between 26 and 27, and then at the positions of the next horizontal oilways e, f, g and h between the coils 22 and 23 on the four coils. It is arranged at the position of the next horizontal oil passage i, j, k and l between the coils 18 and 19 on the four coils, and then the inner baffle plate 58 is arranged between the coils 14 and 15 on the four coils. Of the horizontal oilways a, b, c and d of the next horizontal oilways e, f between the coils 10 and 11 on the four coils. , G and h, and further adjacent to the horizontal oil passages i, j, k and l between the coils 6 and 7 on the four coils, and then the outer baffle plate 59 is connected to the coil 2. It is arranged at the positions of horizontal oilways a, b, c and d between 3 and 4.

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, in which the coil 1 is provided between the inner insulating cylinder 52 and the outer insulating cylinder 53. 9 are arranged. An inner vertical oil passage 56 is arranged inside the coil, and an outer vertical oil passage 57 is arranged outside the coil. An inner baffle plate 58 is arranged below the coil 9, and an outer baffle plate 59 is arranged above the coil 1, as shown in FIG. Up to 1, the temperature rise in the winding is almost uniform.

Although the disk winding is described in the embodiment of the present invention, it is needless to say that the same effect can be expected when the winding 51 is a helical winding.

[0031]

[Effect of device]

 As described above, in the transformer winding cooling structure of the present invention, the outer baffle plate that blocks the plurality of adjacent outer vertical oil passages and the inner baffle plate that blocks the plurality of adjacent inner vertical oil passages. Are axially separated by a plurality of stages so as to alternately block the inner and outer vertical oil passages, and the mounting positions of the outer baffle plate and the inner baffle plate are sequentially shifted in the axial direction by a plurality of coil stages. In addition, since it is provided at the position where it is sequentially rotated in the circumferential direction, (1) Since a structural part with high cooling efficiency near the outlet of the flow-divided section can be arranged in all stages of the coil, local heating of the winding is suppressed.

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

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

Excellent effects such as

[Brief description of drawings]

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

FIG. 2 is a vertical cross 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 a cooling structure of the present invention.

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

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

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

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

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

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

FIG. 13 is a vertical cross-sectional explanatory 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 passage 57 ... Outer vertical oil passage 58 ... Inner baffle plate 59 ... Outer baffle Plates 1-9 ... Coil A, B, C ... Horizontal oil passage a, b, c ... Horizontal oil passage

Claims (1)

[Scope of utility model registration request] 1. A disk-shaped winding or a helical winding is housed between inner and outer insulating cylinders provided on the outer periphery of an iron core, and a plurality of horizontal oil passages are provided between the coils of the winding through a plurality of radial duct pieces. Are formed radially, and a plurality of axial duct rods are inserted between the inner and outer circumferences of the winding and the inner and outer insulating cylinders to form a plurality of inner and outer vertical oil passages communicating with the horizontal oil passage. In the transformer winding, an outer baffle plate that blocks a plurality of adjacent outer vertical oil passages and an inner baffle plate that blocks a plurality of adjacent inner vertical oil passages are alternately closed between the inner and outer vertical oil passages. In this way, the outer baffle plate and the inner baffle plate are separated from each other by a plurality of stages in the axial direction, and the mounting positions of the outer baffle plate and the inner baffle plate are sequentially moved by a plurality of coil stages in the axial direction to sequentially rotate in the circumferential direction. Characteristic transformer winding cooling structure.