WO2014132450A1

WO2014132450A1 - Oil-filled transformer

Info

Publication number: WO2014132450A1
Application number: PCT/JP2013/055743
Authority: WO
Inventors: 辰則佐藤; 篠原　誠; 遠藤　博之; 高橋　俊明
Original assignee: 株式会社日立産機システム
Priority date: 2013-03-01
Filing date: 2013-03-01
Publication date: 2014-09-04
Also published as: JPWO2014132450A1

Abstract

In an oil-filled transformer, in order to suppress coil deformation at short-circuit time, conventionally, there have been such methods as improving coil strength, pressing coils using a metal fitting, increasing strength of an outer core, and the like. The objective of the present invention is to suppress coil deformation using a configuration with simplified structure. The present invention is an oil-filled transformer provided with cores, and one or a plurality of coils into which the cores are inserted, wherein the configuration is such that: at least one of the cores is an outer core disposed outside the outermost portion of the respective coil; the cores form two rows; coil-pressers which press the outside of the coils are disposed between the first and second rows of the outer cores and at the side surfaces of the outer cores; and the coil pressers, the cores, and the coils are covered, fastened, and fixed with upper fastening fittings and lower fastening fittings.

Description

Oil-filled transformer

The present invention relates to an oil-filled transformer using a three-phase five-legged iron core, and more particularly to a structure that suppresses coil deformation during a short circuit.

In oil-filled transformers with three-phase five-leg wound cores composed of magnetic materials such as amorphous ribbons and silicon steel plates, when the magnetic material is amorphous ribbons, the space factor is low, and compared to silicon steel plates against external forces. And easily deformed.
Therefore, since the iron core is also deformed by the coil deformation when the transformer is short-circuited, a method of suppressing the coil deformation is taken. As a means for suppressing coil deformation, a method of increasing the strength of the coil or a method of pressing the coil with a metal fitting is taken. In the outer iron core structure, a method of reinforcing the iron core and suppressing coil deformation is also possible.

Patent Document 1 (Japanese Patent Application Laid-Open No. 2005-72160) discloses an amorphous iron core that includes a coil and a plurality of amorphous wound cores that are linked to the coil in order to eliminate the need for a reinforcing material for holding the coil and to make the structure compact. In a transformer, it is described that a plurality of amorphous wound iron cores are arranged adjacent to each other in the winding radial direction, and have a wound iron core wound with a silicon steel strip on the outermost part in the winding radial direction. Measures against coil deformation at the time of short circuit.

Patent Document 2 (Japanese Patent Application Laid-Open No. 2001-244121) discloses an amorphous iron core transformer that includes a plurality of iron cores using amorphous magnetic ribbons and a plurality of coils into which iron cores are inserted. One has a frame-shaped coil pressing metal fitting that surrounds the iron core and presses the outside of the coil, and a plurality of iron cores and frame-shaped coil pressing metal fittings are arranged in the width direction of the iron core, and one frame-shaped coil pressing metal fitting Describes that each surrounds one iron core, increasing the strength of the outermost structure of the coil and taking measures against coil deformation.

Japanese Patent Laid-Open No. 2005-72160 JP 2001-244121 A

9A and 9B show a configuration for suppressing the coil deformation described in the conventional technique of Patent Document 1 and Patent Document 2. FIG. 9A is a partial front view of the coil core assembly, and FIG. 9B is a partial top view thereof. 9A and 9B, 10 is a coil, 20 is a wound iron core, 20a is an outer iron core, 20b is an inner iron core, 30 is a coil retainer, 30a is a coil retainer reinforcement, 30b is an E-shaped coil retainer, and 40 is an upper clamp. , 40b is the outermost X-direction of the upper clamp, 50 is the lower clamp, 50b is the outermost X-direction of the lower clamp, and 70 is a connecting bolt.

The E-shaped coil retainer 30b is brought into contact with the coil 10 so as to cover the E-shaped coil retainer 30b with the U-shaped coil retainer 30. Further, the U-shaped coil retainer 30 is attached with a U-shaped elongated coil retainer reinforcing plate 30a by welding or the like to improve the strength. With such a configuration, the mechanical force acting on the coil 10 at the time of a short circuit is prevented from being transmitted to the iron core 20a.

Further, when the coil core assembly shown in FIGS. 9A and 9B is placed in the oil-filled transformer shown in FIG. 10, an E-shaped coil presser 30b and a coil presser are provided on both sides in the X-axis direction of the coil core assembly. 30 and the coil presser reinforcing plate 30a are installed, the length in the X-axis direction is long. Therefore, the dimension in the X-axis direction is large in the oil-filled transformer.
In the oil-filled transformer of FIG. 10, 200 is a tank of the oil-filled transformer body, 210 is a cooling wave rib provided at the periphery of the tank, 220 is a welding line welded and fixed above and below the wave rib, and the wave rib 210 Gives strength to prevent deformation. 230 is a primary side terminal for connecting a high voltage power source transmitted from a power plant, 240 is a secondary side terminal for connecting a voltage stepped up or down by a transformer to the load side. The coordinate axis is the X axis in the longitudinal direction of the transformer, the Y axis in the depth direction, and the Z axis in the height direction.

The present invention solves the above-mentioned problems of the prior art, suppresses coil deformation with a simplified structure, reduces mass and material costs with simplified structure, and improves workability. The purpose is to provide an input transformer.

In order to solve the above problems, the present invention provides an oil-filled transformer including an iron core and a coil or coils into which the iron core is inserted, wherein at least one of the iron cores is outside the outermost part of the coil. An iron core is disposed, the outer iron core and the inner iron core are formed in integer rows, coil retainers that hold the outside of the coil are disposed between the rows of the outer iron cores, and on the side surfaces of the outer iron core, the coil retainers, The iron core and the coil are covered with an upper clamp and a lower clamp, and are fastened and fixed.

According to the present invention, the coil deformation at the time of short-circuiting of the oil-filled transformer can be suppressed with a simple structure, and the structure can be made compact to reduce the assembly man-hours and material costs, thereby reducing the weight. A five-legged iron core transformer can be obtained.

The perspective view of the structure of the three-phase five-leg wound core of Example 1 of this invention is shown. The perspective view of the coil iron core assembly of the three-phase five-legged of Example 1 is shown. The perspective view which mounts an upper clamp and a lower clamp on the coil iron core assembly of Drawing 1B is shown. The partial front view of the right side of the coil iron core assembly of Example 1 is shown. The front view which displayed the mechanical force of the right part of the coil iron core assembly of Example 1 is shown. The perspective view of the coil core assembly of the three-phase five-legged core of Example 2 of this invention is shown. FIG. 3B is a perspective view of mounting the upper clamp and the lower clamp on the coil core assembly of FIG. 3A. 3B is a perspective view of a three-phase five-leg wound core structure in which an upper clamp and a lower clamp are attached to the coil core assembly of FIG. 3B. FIG. The coil iron core assembly perspective view of Example 3 of this invention is shown. The perspective view of the coil of Example 4 of this invention is shown. The perspective view of the coil iron core assembly of Example 4 is shown. The perspective view of the three-phase five-leg wound iron core structure of Example 4 is shown. The perspective view of the coil of Example 5 of this invention is shown. The perspective view of the coil iron core assembly of Example 5 is shown. The perspective view of the three-phase five-leg wound iron core structure of Example 5 is shown. The perspective view of the coil iron core assembly of Example 6 of this invention is shown. The perspective view of the coil iron core assembly of Example 7 of this invention is shown. 1 shows a partial front view of a prior art coil core assembly. FIG. FIG. 9B shows a partial top view of FIG. 9A. An external view of the oil-filled transformer is shown.

Embodiments of the present invention will be described below with reference to the drawings.
(Example 1)
Example 1 of the present invention will be described using the three-phase five-leg wound core transformer of FIG. 1A. FIG. 1A is a perspective view of a three-phase five-leg wound core transformer. In FIG. 1A, 10 is a coil, 20 is an iron core, 20a is an outer iron core, 20b is an inner iron core, 30 is a coil presser, and 40 is an upper clamp. , 40a, 40b are the outermost parts of the upper clamp, 50 is the lower clamp, and 50a, 50b are the outermost parts of the lower clamp. 60 is a connecting member, and 70 and 71 are connecting bolts.

In FIG. 1A, a wound iron core 2 made of amorphous or silicon steel is inserted into a central hole of a wound coil 10 and wrapped to assemble the coil and the iron core to form an integrated coil iron core assembly. The coil core assembly is fastened and fixed by the upper fastener 40 and the lower fastener 50 from above and below the solid body, respectively.
In addition, coil pressers 30 are formed on the coils 10 on both sides.

Next, an assembly method of the configuration of the present invention shown in FIG. 1A will be described with reference to FIGS. 1B and 1C. FIG. 1B shows a perspective view of forming the coil retainer 30 in the assembly of the coil 10 and the iron core 2. Three coil retainers 30 are installed at each of the left and right outer iron cores 20a in order to prevent the coil 10 from expanding and deforming in the X-axis direction when short-circuited. That is, the plate-like coil presser 30 is inserted and arranged in the outer iron core 20a between the side surfaces 20c and 20d of the wound iron core and between the two rows of wound iron cores divided in the Y direction.
Further, the plate-like coil retainer 30 is disposed so as to be perpendicular to the side surface of the coil 10. This is because the plate-shaped coil presser 30 is stronger not by the surface but by the side.
Further, the dimension of the coil retainer 30 in the X-axis direction is equal to or larger than the Z direction of the coil and the dimension according to the mechanical force so that a force acting on the outer iron core 20a is not applied at the time of a short circuit. To do.

Next, a configuration in which the coil assembly in which the coil presser 30 shown in FIG. 1B is formed is fastened and fixed by the upper clamp 40 and the lower clamp 50 in the vertical direction will be described with reference to FIG. 1C.
In FIG. 1C, the upper clamp 40 is a rectangular plate having a box shape with rising portions on each side, and covers the coil core assembly. Further, connecting bolts 71 are provided at the ends of the rising

portions

40d and 40c in the longitudinal direction of the upper clamp 40, respectively.

Next, the lower clamp 50 will be described. Like the upper clamp 40, the lower clamp 50 is a rectangular plate having a box shape with rising portions on each side, and the coil core assembly in which the coil presser 30 is formed is housed in the box shape. And
Further, the connecting bolts 70 are respectively installed at the ends of the rising

portions

50d and 50e in the longitudinal direction of the lower clamp 50.
In FIG. 1A, the connecting

bolts

70 and 71 installed at the corners of the upper clamp 40 and the lower clamp 50 are fitted with plate-like connecting members 60 having connecting bolt holes at both ends. Therefore, the upper clamp 40 and the lower clamp 50 are connected and fastened and fixed.
1A to 1C, the connecting

bolts

70 and 71 are disposed on both

sides

40d and 40e in the longitudinal direction of the upper clamp 40 and the

lower clamp

50, and 50d and 50e. The coil iron core assembly is configured by fitting into the connection bolts of the metal fittings and the lower metal fittings and fastening them with nuts to connect and fix them. With such a configuration, the length in the X-axis direction can be made shorter than the conventional length, the length of the tank of the oil-filled transformer in the X-axis direction can be reduced, and the size can be reduced.

Next, FIGS. 2A and 2B show a partial front view of the right side of the three-phase five-leg wound core of FIG. 1A, and the mechanical force acting on the coil at the time of short circuit will be described with reference to FIG. 2B.
FIG. 2A shows a partial front view in which the coil 10 is wound around the outer iron core 20a, and the coil iron core assembly is fastened and fixed by the upper clamp 40 and the lower clamp 50 in the vertical direction.
As shown in FIG. 1C, the coil retainer 30 includes an outer side surface 20c of the outer iron core 20a in the first row, a gap between the outer iron cores in the first row and the second row, and an outer side of the outer iron core in the second row. It is arranged on the side surface 20d.

Next, the mechanical force acting on the coil 10 when short-circuited in the configuration of the coil and iron core shown in FIG. 2B will be described. FIG. 2B shows the direction of the mechanical force acting on the coil 10 when the transformer is short-circuited. In FIG. 2B, an arrow 75 represents a mechanical force acting on the coil at the time of a short circuit, an arrow 76 represents a mechanical force acting on the upper and lower fasteners of the coil retainer 30, and an arrow 77 represents a rotational and deformation force acting on the coil retainer 30. Represents.
The mechanical force 75 acting on the coil 10 is a force that the coil 10 pulls in the X direction, that is, an expanding force according to Fleming's left-hand rule because the current flows perpendicular to the paper surface, and acts as indicated by an arrow 75. Without the coil retainer 30, the mechanical force acting on the coil 10 is directly transmitted to the outer iron core 20a, causing the iron core to deform. The coil retainer 30 is installed in the X direction so that the mechanical force 75 is not transmitted to the outer iron core 20a. The length of the coil retainer 30 in the Z direction is larger than the length of the coil in the Z direction, and is approximately equal to or longer than the length of the outer iron core in the Z direction, and is tightened with the upper clamp 40 and the lower clamp 50. To be fixed.
With such a configuration, a force 77 that is rotated and deformed by the mechanical force 75 acting on the coil 10 generates the upper fastener 40 and the lower fastener 50, but the amount of deformation of the outer iron core can be reduced.

Further, the coil retainer 30 is formed so as to be perpendicular to the side surface of the coil 10, that is, the outermost surface, that is, so as to contact the side of the coil retainer 30 of the plate material, and is configured to increase the strength. If it is received on the plate-like surface of the coil retainer 30, the strength is weakened, so that it is received on the side.

Further, the mechanical force when the coil 10 is short-circuited is as close as possible to the inner dimension in the Z-axis direction when the upper clamp 40 and the lower clamp 50 are arranged, taking into account assembly tolerances. The amount of deformation of the coil retainer 30 is reduced by stopping the rotation of the upper and lower end surfaces of the coil retainer 30 with the upper clamp 40 and the lower clamp 50 using the rotation and deformation force 77 of the coil retainer 30. The coil presser 30 is made of a simple plate material made of an insulating material or metal.

In the first embodiment, by effectively utilizing the dimension of the core thickness of the outer core that is larger than the height of the reinforcement, it is possible to configure a lightweight, simple but highly rigid reinforcement. As the material of the coil retainer 30, for example, an insulating material is used when the mechanical force when the coil 10 is short-circuited is small, and when the mechanical force is large, a metal or the like is used according to the mechanical force when the coil 10 is short-circuited.

The outermost portion of the coil retainer 30 is in contact with the

outermost portions

40a and 40b in the X-axis direction of the upper fastener and the

outermost portions

50a and 50b in the X-axis direction of the lower fastener, and the coil retainer 30 does not jump out in the X-axis direction. Press like so. As for the strength of the contact portion, since the rigidity of the coil presser 30 is sufficiently high and the deformation is small, only the force in the X-axis direction needs to be considered. The base material 4C of the upper clamp 40 and the base material 50C of the lower clamp 50 A simple plate having a slightly thicker plate is welded to form. The base materials 40C and 50C only need to consider the tensile stress in the X-axis direction, and even a thin plate material can secure sufficient strength and can be reduced in weight.

For example, as shown in FIG. 1, the upper clamp 40 and the lower clamp 50 are connected by connecting members 60 by welding connecting

bolts

70 and 71 to the upper clamp 40 and the lower clamp 50, respectively. At this time, since the coil presser 30 does not have to consider the strength for lifting the contents, an insulating material can be used.

In the prior art, the coil retainer is arranged on the YZ plane of 40a, 40b, 50a, 50b and is connected with the connecting bolt in the X-axis direction. Tanks to do this increase, increasing the amount and mass of oil. Therefore, in this embodiment, the

coil retainers

40a, 40b, 50a, 50b are the outermost dimensions, the connecting member 60 and the connecting

bolts

70, 71 are arranged on the XZ plane, and the connecting

bolts

70, 71 are in relation to the Y axis. Tighten. Although the amount of oil and mass are reduced, the entire metal fitting rotates around the Y axis, so the Y dimension of 40a, 40b, 50a, 50b is extended beyond the Y dimension of 40C, 50C, and the YZ of the connecting member 60 is increased. A structure that stops the rotation by contacting the plane.

The coil retainer 30 and the connecting member 60 may be formed of the same member. For example, the metal coil retainer 30 welded to the lower fastener 50 is extended to above the upper fastener 40, and the upper fastener 40 is connected using a connecting bolt. By combining with, the mechanical force at the time of a short circuit can be received, and the function which connects the upper clamp 40 and the lower clamp 50 required for lifting can be given.

FIG. 1 shows an example of a two-row iron core. In the case of a single-row iron core, a similar structure is obtained in which coil retainers 30 are arranged on both side surfaces of the iron core. Moreover, when the iron core 20 is a multiple row | line | column of 2 or more rows, the coil holding | suppressing 30 is added between each row | line | column of an outer iron core.

This structure is intended to improve the strength of the member that holds the outermost part of the coil, and the present invention is not limited to the amorphous iron core. Depending on the short-circuit mechanical force of the coil, the silicon steel sheet may have deteriorated characteristics or insufficient strength. Therefore, they can be improved by the invention of Example 1.

The space factor of silicon steel sheet is about 97%, and it is difficult to deform compared to an amorphous iron core. However, since it is a laminate of thin steel sheets, it is not a single piece of welded iron. Therefore, the silicon steel sheet may have insufficient strength depending on the short-circuit mechanical force of the coil, and this can be improved by the present invention.

(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIGS. 3A, 3B, and 3C. FIG. 3A shows a perspective view of a configuration in which the coil retainer is installed on the iron core 20 using a hollow rectangular plate and a U-shaped plate. FIG. 3B shows a perspective view in which the coil presser of FIG. 3A is mounted and the upper clamp 40 and the lower clamp 50 are installed. FIG. 3C shows the

coil pressers

80, 81, 82, the upper clamp 40, and the lower clamp. The perspective view of the coil iron core assembly of the state which mounted | wore 50 and attached the connection member is shown.

In FIG. 3A, the coil retainer 80 installed on the side surface of the wound iron core 20 in the first row and the coil retainer 82 installed on the side surface of the wound core 20 in the second row are formed in a hollow rectangular shape. A U-shaped coil presser 81 is inserted into the gap between the wound cores from both sides. The central coil core assembly shown in FIG. 3A shows a perspective view after the

coil retainers

80, 81, 82 have been incorporated.

Next, a perspective view of a configuration in which the upper clamp 40 and the lower clamp 50 are attached to the coil core assembly equipped with the coil press shown in FIG. 3A will be described with reference to FIG. 3B.
In FIG. 3B, the upper clamp 40 is a rectangular plate and forms a box shape having rising

portions

40a, 40b, 40d, and 40e on each side. Furthermore, connecting bolts 71 for connecting to the lower clamp 50 are provided at both ends of the rising

portions

40d and 40e in the longitudinal direction of the upper clamp 40.
Similarly, the lower metal fitting 50 is also a rectangular plate, provided with rising

portions

50a, 50b, 50d, and 50e on each side, has a box shape, and is provided at both ends of the longitudinal rising

portions

50d and 50e. A connecting bolt 70 for connecting to the upper clamp 40 is installed. Then, the coil core assembly having the coil pressers 80.81 and 82 is sandwiched between the upper clamp 40 and the lower clamp 50 in the vertical direction.

Next, the

coil retainers

80, 81, 82 are attached to the coil core assembly, and are further clamped by being sandwiched from above and below by the upper clamp 40 and the lower clamp 50, and the upper clamp 40 and the lower clamp 50 are connected by the connecting member 60. FIG. 8 is a perspective view of the configuration in which the two are connected.
In FIG. 8, connecting members 60 for connecting the upper clamp 40 and the lower clamp 50 are attached to the corresponding connecting

bolts

71 and 70 installed at the corners of the upper clamp 40 and the lower clamp 50, The

coil holders

80, 81, 82, the wound core 20 and the coil 10 are fixed so as not to move by tightening with nuts.

(Example 3)
Next, the configuration of Embodiment 3 of the present invention will be described with reference to FIG. FIG. 4 shows a perspective view of a configuration in which three U-shapes are arranged in parallel and fixed to a flat plate as a structure of the coil retainer 90 and incorporated in the coil core assembly.
In FIG. 4, the coil retainer 90 has a structure in which three U-shaped plate materials are arranged side by side to form a flat plate, which is manufactured by molding an insulating material, or manufactured by welding a metal plate and then winding or coating the insulating material. To manufacture.
Further, the interval between the U-shaped plate members is the width interval in the depth direction of the first row and the second row of the iron cores 20, and the U-shaped portion in front is on the side surface in front of the outer core 2a in the first row, The center U-shaped part is between the first and second rows of the outer core 2a, and the inner U-shaped part is on the back side of the second row of the outer core 2a. The coil retainer 90 is assembled from both sides to form a coil core assembly. The coil iron core assembly of FIG. 4 shows a state after the coil retainer 90 is incorporated.

The coil retainer 90 is an insulating material, or a metal plate wound with an insulating material or coated.

Although not shown, a three-phase five-leg wound core is formed by providing an upper clamp and a lower clamp on the coil core assembly with the coil retainer 90 shown in FIG. Put it in the tank of the oil-filled transformer.

Example 4
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 5A, 5B, and 5C. FIG. 5A shows a perspective view of a state in which a strip-shaped insulating material is wound in two stages around the coil 10 of the three-phase five-leg wound core transformer.
The strip-shaped insulating material wound around the coil has oil resistance against the insulating oil filled in the transformer, and when a metal plate is used, the periphery is wound with an insulating material or the surface is coated.

Next, FIG. 5B shows a perspective view of the configuration of the coil core assembly in which the iron core 20 is mounted on the coil 10 shown in FIG. 5A. FIG. 5B shows a perspective view of a coil core assembly in which the iron core 20 is incorporated in the coil 10, and the iron core 20 is configured to include the strip-shaped insulating

materials

100 and 101 wound around the coil 10.

Next, FIG. 5C shows a state in which the upper fastener 40 and the lower fastener 50 are incorporated in the coil core assembly shown in FIG. 5B.
FIG. 5C is a perspective view of a configuration in which the upper clamp 40 and the lower clamp 50 are mounted on the coil core assembly. In FIG. 5C, the upper clamp 40 is provided with a rising portion on each side of a rectangular plate material, A shape is formed, and the coil core assembly is covered from above. Similarly, the lower clamp 50 is also provided with a rising portion on each side of a rectangular plate material to have a box shape and accommodate the coil core assembly. The connecting members 60 are respectively connected to the connecting bolts 71 installed at both ends of the rising portion in the longitudinal direction of the upper clamp 40 and the connecting bolts 70 formed at both ends of the rising portion in the longitudinal direction of the lower clamp 50. And fasten with nuts to connect and fix.
In the three-phase five-leg wound core transformer having such a configuration, even if a short-circuit accident occurs, the bulge of the coil can be suppressed and protected against the bulge force of the coil with a strip-shaped insulating material.

(Example 5)
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 6A, 6B, and 6C. 6A, FIG. 6A (a) shows a perspective view of a single coil 10 in which a strip-shaped insulating material is wound in two stages, and FIG. 6A (b) is a three-phase five-leg coil, showing a strip-shaped insulating material. FIG. 2 is a perspective view showing a state in which three single coils 10 wound in two stages are arranged and further wound around a central stage with a strip-like piece.
In FIG. 6A (b), in the state where three coils 10 wound with a two-step strip-shaped insulating material are arranged in the circumferential direction of a single coil 10, three central portions of the two-step strip-shaped insulating material are combined into a strip shape. The structure wound with the insulating material is shown.

Next, FIG. 6B shows a configuration in which the iron core 20 is mounted on the coil 10 shown in FIG. 6A (b). FIG. 6B shows a case where three coils each having two strips of insulating

material

120 and 121 wound on a single coil 10 are arranged and further three are arranged between two strips of insulating

material

120 and 121. The perspective view of the coil core assembly which attached the iron core 20 to the coil which wound 130 is shown.

Next, FIG. 6C shows a configuration in which the upper clamp 40 and the lower clamp 50 are mounted on the coil core assembly shown in FIG. 6B. FIG. 6C shows a single coil 10 in which two strips of insulating

materials

120 and 121 are wound in the coil winding direction, three coils 10 are arranged in the horizontal direction, and the central stage is bundled with a strip-shaped insulating member 130. The upper core 40 and the lower fastener 50 are covered in the vertical direction by inserting the iron core 20, and the connecting bolt 71 provided at the corner of the upper fastener 40 and the connecting bolt 70 provided at the corner of the lower fastener 50. The connecting member 60 is attached to the upper member, and the upper fastening member 40 and the lower fastening member 50 are connected by tightening with a nut and the respective components are fixed to form a three-phase five-leg wound core.

(Example 6)
Next, Embodiment 6 of the present invention will be described with reference to FIG.
FIG. 7 is a three-phase five-legged coil in which three coils 10 are arranged in the X-axis direction. In order to suppress the mechanical force that the coil expands at the time of short circuit, The insulating member 140 is wound in a direction perpendicular to the winding direction of the coil.
Further, the longitudinal sides of the inner coil 10 are wound around the insulating member 141 together with the adjacent coil sides on both sides.
Although not shown, an iron core is inserted into the coil configuration shown in FIG. 7 to form a coil core assembly, which is covered with an upper clamp and a lower clamp from above and below, and provided at the corner of the upper clamp. A connecting member is attached to a connecting bolt provided at a corner of the connecting bolt and the lower clamp, and the upper clamp and the lower clamp are connected and fixed with a nut to constitute a three-phase five-leg wound core.
Moreover, the effect of suppressing the expanding mechanical force at the time of the short circuit of a coil is large when the width | variety of the strip | belt-shaped

insulation members

140 and 141 which wrap around the coil side is made wide rather than narrowing.

(Example 7)
Next, Embodiment 7 of the present invention will be described with reference to FIG.
FIG. 8 is a three-phase five-legged coil in which three coils 10 are arranged in the X-axis direction, and shows a configuration that suppresses the mechanical force that causes the coil to expand when short-circuited, as in the sixth embodiment. That is, in FIG. 8, three coils 10 are arranged in the horizontal direction, and the insulating

members

150 and 151 are wound at two locations on the outer side of the coil 10 on both sides in a direction perpendicular to the coil winding direction. . In addition, the longitudinal side of the inner coil 10 is wound around two insulating

members

152 and 153 together with adjacent coil sides on both sides.
Although not shown, an iron core is inserted into the coil configuration shown in FIG. 8 to form a coil core assembly, which is covered with an upper clamp and a lower clamp from above and below, and provided at the corner of the upper clamp. A connecting member is attached to a connecting bolt provided at a corner of the connecting bolt and the lower clamp, and the upper clamp and the lower clamp are connected and fixed with a nut to constitute a three-phase five-leg wound core.
In the above embodiment, a three-phase five-leg wound core transformer has been described. However, the present invention can also be applied to a three-phase three-leg wound core transformer or a single-phase transformer.

10. Coil 20 ... Iron core 20a ... Outer iron core 20b ... Inner iron core 30 ... Coil retainer 30a ... Coil retainer reinforcement 30b ... E-shaped coil retainer 40 ... Upper clamps 40a, 40b ... Outer clamp 40c in the X direction of the upper clamp Fastener base material 50

Lower fasteners

50a, 50b Outer clamp X-direction outermost 50c Lower fastener base material 60

Connection members

70, 71

Connection bolts

100, 101, 120, 121, 130 Band-shaped insulating

material

140, 141, 150, 151... Band-shaped insulating material

Claims

In an oil-filled transformer comprising an iron core and one or more coils into which the iron core is inserted,
At least one of the iron cores has an outer iron core disposed outside the outermost part of the coil, and the outer iron core and the inner iron core form an integer sequence,
Coil pressers that hold the outside of the coil are disposed between the rows of the outer cores and on the side surfaces of the outer cores,
An oil-filled transformer having a configuration in which the coil presser, the iron core, and the coil are covered with an upper clamp and a lower clamp, and are fastened and fixed.
The oil-filled transformer according to claim 1,
The oil-filled transformer is characterized in that the coil retainer is arranged perpendicular to the outermost surface of the coil or parallel to the side surface of the outer iron core.
The oil-filled transformer according to claim 2,
The oil retaining transformer, wherein the coil retainer is a rectangular plate, a hollow rectangular plate and a U-shaped plate, or a plate in which a U-shaped plate is fixed to a flat plate.
The oil-filled transformer according to claim 1,
The coil holder is an oil-filled transformer, wherein an insulating material or a metal plate is wound or coated with an insulating material.
The oil-filled transformer according to claim 1,
The oil-filled transformer is characterized in that the iron cores are arranged in one row, two rows, or an integer row in a side surface direction of the iron core.
The oil-filled transformer according to claim 1,
The oil-filled transformer, wherein a dimension in a longitudinal direction in which the iron core, a coil, and a coil retainer are assembled is smaller than a dimension in a longitudinal direction of the upper fastener and the lower fastener.
The oil-filled transformer according to claim 1,
The oil retaining transformer is characterized in that the coil presser is disposed between the outermost two rows of iron cores of the coil on both sides and on the side surfaces of the front and rear outer cores.
In an oil-filled transformer comprising an iron core and one or more coils into which the iron core is inserted,
At least one of the iron cores forms an outer iron core disposed outside the outermost part of the coil;
The coil is a single coil wound with a strip-shaped insulating material in the winding direction of the coil, and a plurality of other strip-shaped insulating materials are wound together to incorporate an iron core,
An oil-filled transformer having a configuration in which the iron core and the coil are covered with an upper clamp and a lower clamp, and are fastened and fixed.
In an oil-filled transformer comprising an iron core and one or more coils into which the iron core is inserted,
At least one of the iron cores forms an outer iron core disposed outside the outermost part of the coil;
The coil is a single coil, perpendicular to the winding direction of the coil, and wound with a strip-shaped insulating material on the longitudinal side of the coil, and incorporates the iron core,
An oil-filled transformer having a configuration in which the iron core and the coil are covered with an upper clamp and a lower clamp, and are fastened and fixed.
The oil-filled transformer according to claim 8 or 9,
The oil-filled transformer, wherein the strip-shaped insulating material around which the coil is wound is strip-shaped or string-shaped.
The oil-filled transformer according to claim 8 or 9,
The oil-filled transformer, wherein the strip-shaped insulating material wound around the coil is a metal plate wound with an insulating material or a metal plate coated with an insulating material.