JP2018120882A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which, since a location of a steel band through hole in an upper metal fitting of a transformer is different depending on a shape of an iron core, dedicated design of the upper metal fitting is necessary for each model, which causes part types to increase and causes a problem that an inventory storage place is pressed at a transformer assembly workplace, and when lifting transformer content in order to put it into a tank, since all the load of the transformer content is applied to an upper fastening metal fitting, the upper fastening hardware requires strength, and increasing the mass of the transformer content by increasing a plate thickness is a problem.SOLUTION: The transformer has a steel band covering an iron core and a holding member that holds the iron core from above. The holding member has a curved surface portion extending from an upper surface to a side surface of the iron core. The steel band is disposed so as to follow the curved surface portion.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a transformer.

  In Patent Document 1 (Japanese Patent Laid-Open No. 2006-294673), “After inserting the iron core 1 into the coil 2, after arranging the lower clamp 5 that supports the iron core 1 and the upper clamp 4 provided on the upper part of the iron core 1, By inserting the iron band 6 between the iron core 1 and the coil 2, passing the band insertion holes (17a, 17b, 18a, 18b) provided in the upper clamp 4 and the lower clamp 5, and then tightening the iron band 6 In the transformer content support device configured as described above, on the side surface of the iron core 1 between the iron core 1 inserted in the coil 2 and the length of the iron core 1 is substantially the same as the iron core height of the iron core 1 or longer than the iron core height. 7 is inserted, and the upper clamp 4 and the lower clamp 5 and the support plate 7 form a box shape when the steel band is tightened.

JP 2006-294673 A

  In Patent Document 1, a suspension bolt 8 is provided on an upper clamp 4 through which an iron band 6 for tightening an iron core 1 is passed.

  However, when the transformer contents 101 having a main part such as an iron core and a coil are lifted to enter the tank 10, all the loads of the transformer contents are applied to the upper clamp 4, so that the upper clamp 4 can withstand this load. It is not considered that strength is required and the plate thickness must be increased, resulting in an increase in the mass of the transformer.

  An object of the present invention is to provide a transformer having a strength capable of lifting the contents of the transformer and having a reduced mass.

  In order to solve the above-described problems, as an example of the present invention, a transformer having an iron core, the upper fastening metal disposed at the upper part of the iron core, and the upper corner of the iron core, between the upper fastening metal A plate-like member to be arranged, and a member connected to the plate-like member and lifting the iron core from above, and the upper fastener corresponds to the hole through which the lifting member penetrates and the width of the iron core A member that has a hole, and has a steel band that passes through the corresponding hole, passes through the hole corresponding to the width of the iron core, and holds the plate-shaped member, the upper fastener, and the iron core. Features.

  According to the present invention, it is possible to provide a transformer with reduced mass.

It is a schematic explanatory drawing which shows the content structure of the transformer of this invention. It is a schematic explanatory drawing which shows the content structure of the transformer of this invention, and is a figure which did not display an upper clamp and a steel band. It is a schematic explanatory drawing which shows the content structure of the transformer by which the holding member of this invention is arrange | positioned between an iron core and a coil. It is the schematic explanatory drawing which shows the content structure of the transformer with which the holding member of this invention is arrange | positioned between an iron core and a coil, and is a figure which did not display an upper clamp and a steel band. It is a schematic explanatory drawing which shows the content structure lower part side of the transformer by which the holding member of this invention is arrange | positioned between an iron core and a coil. It is a schematic explanatory drawing which shows the content structure of the transformer with which the holding member of this invention is arrange | positioned between the iron core comprised by the amorphous thin strip, and a coil. It is the schematic explanatory drawing which shows the content structure of the transformer arrange | positioned between the iron core comprised by the amorphous thin strip, and the coil of this invention, and is a figure which did not display an upper clamp and a steel band. It is a schematic explanatory drawing which shows the content structure lower part side of the transformer with which the holding member of this invention is arrange | positioned between the iron core comprised by the amorphous thin strip, and a coil. It is a schematic explanatory drawing which shows the content structure of the transformer of this invention, and is a figure which did not display an upper clamp and a steel band. It is a figure which shows an example of the holding member of this invention. It is a figure which shows an example of the holding member of this invention. It is a figure which shows an example of the holding member of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In all the drawings, members having the same function are denoted by the same reference numerals, and repeated description thereof is omitted.

  In the following embodiment, when it is necessary for the sake of convenience, the description will be divided into a plurality of sections or embodiments. However, unless otherwise specified, they are not irrelevant to each other. Some or all of the modifications, details, supplementary explanations, and the like are related.

In addition, in the following examples, when referring to the number of elements (including the number, numerical value, quantity, range, etc.), unless otherwise specified, the principle is clearly limited to a specific number, etc. The number is not limited to the specific number, and may be a specific number or more.
Similarly, in the following examples, when referring to the shape and positional relationship of components and the like, the shape and the like of the component are substantially excluding unless specifically stated or considered otherwise in principle. It shall include those that are approximate or similar to. The same applies to the above numerical values and ranges.

  1 and 2 illustrate a first embodiment of a transformer according to the present invention. FIG. 1 is a diagram showing the inside of a tank (not shown) of an oil-filled transformer, and shows a three-phase three-leg transformer. FIG. 2 is a view showing a state in which an upper clamp 101 described later from FIG. 1 is not shown.

  The inner iron cores 111 and 112 are configured to cover the outer iron core 108. A coil 109 a is wound around the inner iron core 111 and the outer iron core 108. A coil 109b is wound around the inner iron cores 111 and 112. Similarly, a coil 109 c is wound around the inner iron core 112 and the outer iron core 108.

  A holding member 105 provided with a content hanging stud is disposed on the outer iron core 108.

  The holding member 105 has two planes, and is configured such that the two planes are L-shaped with respect to the upper surface portion and the side surface portion of the corner portion of the outer iron core 108. The content suspension stud 110 is provided on the upper surface portion side of the holding member 105, and the upper surface portion is preferably substantially horizontal with the iron core upper portion.

  By making it substantially horizontal, it becomes easy to provide the content suspension stud 110, and when the entire content of the transformer is lifted by the content suspension stud 110, it becomes easy to align the position when connecting to the tank. is there.

  In addition, the side surface portion of the holding member 105 extends in the vertical direction, but is shorter than the upper surface portion of the coil 109a. When the length is shorter than the upper surface portion of the coil 109a, the angle of the holding member 105 can be easily adjusted because it does not enter between the side surface coil 109a of the holding member 105 and the outer iron core 108.

  On the other hand, when the side surface portion of the holding member 105 is longer than the upper surface portion of the coil 109a, when the holding member 105 is tightened with the steel band 104, the side surface coil 109a and the outer iron core 108 of the holding member 105 Therefore, the iron core 108 and the coil 100a are more easily tightened.

  Further, as a modification, the holding member 105 preferably has a curved surface portion at the connecting portion between the upper surface and the side surface of the outer iron core 108, and the steel band 104 is disposed so as to follow the curved surface portion 105a.

  By providing the curved surface portion 105a, the steel band 104 is not easily bent at the corner portion, and a long life can be realized. The holding member 105 having the curved surface portion 105a can be manufactured by sheet metal processing or the like by bending a single plate-like member. Although the angle inside the curved surface portion 105a may be a right angle, it is preferable to use a curved surface as described above. Even if the holding member 105 is the holding member 105 which has a corner | angular part which does not have the curved-surface part 105a, it can implement.

  The upper clamp 101 disposed between the steel band 104 and the holding member 105 is provided with a steel band through hole 102 and a content hanging stud connection hole 103 as long holes. A long hole is a hole having different vertical and horizontal lengths. Moreover, it is a concept including an elliptical shape and a hole having a shape in which a circle and a circle are connected by a straight line. Also includes rectangular holes.

  In practice, the contents hanging stud 110 may be of a size that can move inside the contents hanging stud connection hole 103. However, in the case of a simple circular shape, it moves not only in the horizontal direction of the iron core 108 but also in the depth direction. A hole having a different aspect ratio and a larger horizontal direction than the depth direction is desirable. The long hole is a through-hole penetrating the upper surface and the lower surface of the iron core protection member 105 provided in the horizontal direction of the iron core 108.

  Further, the content suspension stud connection hole 103 is preferably provided so as to extend from the position when the inner surface of the holding member 105 is in contact with the outer periphery of the iron core 108 toward the outer peripheral side in the horizontal direction of the iron core 108. In addition, if the above-described content suspension stud connection hole 103 is provided toward the inner peripheral side from the position when the inner surface of the holding member 105 contacts the outer periphery of the iron core 108, Position adjustment or adjustment of the tightening amount of the steel band 104 is facilitated.

  It is desirable that the inside portion of the hole-hanging stud connection hole 103 is provided inside the curved surface portion 105a. This is because when the steel band 104 is tightened, the corner portion of the steel band 104 follows the curved surface portion 105. The steel band through hole 102 is a through hole that penetrates the upper surface and the lower surface of the upper clamp 101. The weight of the iron core 108 and the coil 109 is applied to a coil support 107 made of an insulating material such as a plywood plate, and a lower metal fitting 106 for holding the coil support 107 is held by a steel band 104 wound around the iron core 108 and transformed. When lifting the contents of the vessel, the weight of the contents is applied to the curved surface portion of the holding member 105 via the steel band 104.

The holding member 105 is provided with a content hanging stud 110. Although the example in which the content suspension stud 110 is bolted is illustrated, it may be connected by welding.
By holding the steel band 104 wound around the outer iron core 108 and the holding member 105, the holding member 105 comes into contact with the side surface of the outer iron core 108.

  When the steel band 104 is tightened, the holding members 105 arranged at both ends of the outer iron core 108 move to the center side of the outer iron core 108, so that the contents hanging stud 110 also moves to the center side of the outer iron core 108. The holding member 105 can move in the horizontal direction of the outer iron core 108 by providing the movable region of the content hanging stud 110 or the hole 103 for connecting the content hanging stud larger than the movable region.

  That is, the inside of the content suspension stud connection hole 103 may be provided at the same position as the content suspension stud 110 in a state where the steel band 104 is tightened or at the center side of the outer iron core 108 from the position. Thereby, the holding member 105 can be brought into close contact with the outer iron core 108.

  When the content suspension stud 110 is directly provided on the upper clamp 101 as in the prior art, it is necessary to increase the thickness of the entire upper clamp 101. However, in the configuration of this embodiment, the content suspension stud 110 is attached to the holding member 105. Since the stud 110 is provided, the weight can be reduced by the amount of the upper surface of the outer iron core 108, and the upper clamp 101 can be made thinner than the conventional plate.

  That is, the upper clamp 101 is lifted by the holding member 105 and the steel band 104, and the plate thickness of the upper clamp 101 can be reduced. As a result, it contributes to reducing the mass of the entire transformer. Further, when the contents of the transformer are lifted to enter the tank, the load of the contents of the transformer is not all applied to the upper clamp 101, and the plate thickness of the upper clamp 101 can be reduced.

  Also, the holding member 105 can be used when the horizontal size of the outer iron core 108 changes. Thereby, parts can be shared. Further, since the position can be adjusted, even when the horizontal size of the outer iron core 108 varies depending on the inner iron cores 111 and 112 and the coils 109a, 109b and 109c, the steel band 104 can be appropriately tightened. . As a result, it is possible to reduce the iron loss by reducing the distortion of the iron core by optimizing the tightening amount.

  A second embodiment of the transformer of the present invention will be described with reference to FIGS. It is a figure which shows the inside of the tank (not shown) of an oil-filled transformer similarly to Example 1, and shows a three-phase three-leg transformer. A transformer having a steel band 304 covering an iron core 308 and a holding member 305 for holding the iron core 308 from above is shown. Here, the iron core 308 is a general term for the outer iron core and the inner iron core described in the first embodiment.

  FIG. 4 is a view in which the upper clamp 301 is not shown. FIG. 5 is a view of the contents of the transformer observed from the lower oblique direction.

  The holding member 305 has a curved surface portion from the upper surface of the iron core 308 toward the side surface, and the steel band 304 is disposed so as to follow the curved surface portion. That is, a part of the steel band 304 is arranged along the curved surface shape of the curved surface portion. Since the steel band 304 is tightened, each of the steel band 304 and the curved surface portion has a contact portion.

  The difference from the first embodiment is a structure in which the central portion of the holding member 305 corresponding to the side surface portion of the outer iron core 308 protrudes to the lower portion of the coil 309a.

  In addition, a steel band through hole 302 and a content hanging stud connection hole 303 are formed as long holes in the upper clamp 301 interposed between the steel band 304 and the holding member 305.

  Furthermore, the own weight of the iron core 308 and the coils 309a and 309c is applied to a coil support 307 made of an insulating material such as a plywood plate.

  The lower clamp 306 that holds the coil support 307 is held by a steel band 304 wound around an iron core 308. When lifting the contents of the transformer, the weight of the contents is applied to the curved surface portion of the holding member 305 via the steel band 304.

  The holding member 305 is disposed between the iron core 308 and the coils 309a and 309c and protrudes to the lower part of the coil 309. In addition, it becomes possible to radiate the heat of a coil to the coil lower end part where the temperature of insulation oil is low by making the material of the holding member 305 into a member whose heat conductivity is higher than surrounding insulation oil. Specifically, materials such as iron, stainless steel, aluminum, and copper are preferable because they have higher thermal conductivity than insulating oil.

  Further, the protruding portion of the holding member 305 is tightened by the steel band 304, but the outer iron core 308 and the steel band 304 are not in direct contact with each other, so that the surface of the outer iron core 308 can be protected.

  Furthermore, since the protruding portion of the holding member 305 and the outer iron core 308 are in contact with each other on the surface, the outer iron core 308 can be stably clamped and distortion of the outer iron core 308 can be reduced. This is particularly effective in the case of an iron core using an amorphous material whose iron loss changes with strain.

  As a modification, it is preferable to provide fine grooves or recesses in the vertical direction on the surface of the portion of the holding member 105 arranged along the side surface portion of the outer core 108 by hairline processing or cutting. The heat conduction efficiency can be further increased by the insulating oil contacting the grooves and the recesses moving in the vertical direction by capillary action and the contact area between the holding member 105 and the insulating oil increasing.

  Further, the length of the protruding portion of the holding member 305 can be made longer than the lower ends of the coils 309a and the like. In this case, the portion of the insulating oil that protrudes to the portion having a low temperature comes into contact with the insulating oil, so that the heat conduction efficiency can be increased.

  6, 7, and 8 show a third embodiment of the transformer of the present invention, which includes a steel band 604 covering an iron core 608 made of an amorphous ribbon. It is a figure which shows the inside of the tank (not shown) of an oil-filled transformer like Example 1, 2, and shows a three-phase three-leg transformer. The iron core 608 is a general term for the outer iron core and the inner iron core described in the first embodiment.

  A holding member 605 that holds the iron core 608 from above is provided, the holding member 605 has a curved surface portion that faces from the upper surface to the side surface of the iron core 608, and the steel band 604 is disposed so as to follow the curved surface portion. Yes.

  The upper clamp 601 interposed between the steel band 604 and the holding member 605 has a steel band through hole 602 and a content hanging stud connection hole 603 formed as long holes.

  The weight of the iron core 608 and the coils 609a and 609c is applied to a coil support 607 made of an insulating material such as a plywood plate disposed above and below the coils 609a and 609c.

  The length of the coil support 607 in the depth direction may be equal to or greater than the length of the holding member 605 in the depth direction. In this case, since the holding member 605 does not directly contact the iron core 108, local stress is hardly applied to the iron core. In particular, when the iron core is an amorphous member, the strain can be reduced.

  The lower clamp 606 that holds the coil support 607 and the holding member 605 are held by a steel band 604 wound around an iron core 608. The structure is such that a load is not easily applied to the iron core 608 and is applied to the curved surface portion of the holding member 605 via the steel band 604.

The holding member 605 is disposed between the iron core 608 and the coils 609a and 609c and has a shape protruding to the lower part of the coils 609a and 609c.
As in the second embodiment, the holding member 605 is made of a material having high thermal conductivity, so that the heat of the coil can be radiated to the lower end of the coil where the temperature of the insulating oil is low.

  In addition, since the protruding portion of the holding member 605 and the iron core 608 are in contact with each other, the iron core 608 can be stably clamped and distortion of the outer iron core 608 can be reduced.

Further, Example 4 will be described with reference to FIG.
FIG. 9 shows a three-phase three-leg transformer as in the other embodiments, in which the upper clamp and steel band of the transformer according to the fourth embodiment of the present invention are not shown.

  The holding member 905 is configured by an L-shaped plate member having two flat surfaces so as to contact the upper surface portion and the side surface portion of the corner portion of the iron core 908. The upper surface portion of the holding member 905 is a T-shaped plate-like member, and a content hanging stud 910 is provided on the outer peripheral side of the iron core 908. Since the holding member 905 and the like have at least two flat plate-like members, these are collectively referred to simply as plate-like members.

  Since the structure is the same as that of the first to third embodiments, the upper fastening bracket (not shown) is also provided with a long-hole hanging stud connecting hole and a steel band through-hole provided for passing the hanging hook stud 910. .

  The holding member 905 is moved to the center of the iron core when tightened by the steel band. At this time, the side surface portion of the holding member 905 contacts the side surface portion of the iron core 908.

  Thus, the holding member 905, the steel band through-hole, and the steel band can realize a structure in which the proper weight is not applied and the weight of the upper clamp is not applied to the upper clamp when lifting.

  The holding member 905 described above can be manufactured by providing a U-shaped notch at the center of one plate-like member and bending it into an L-shape with an extended line shape between the open ends of the U-shape as fulcrums. Moreover, it can also manufacture by casting etc. and can also manufacture by connecting the plate-shaped member of a T-shaped upper surface part, and a rectangular plate-shaped member by welding.

  In addition, the holding member 905 that holds the iron core 908 from above has a curved surface portion that extends from the upper surface of the iron core 908 toward the side surface, and further protrudes outward from the side surface of the iron core 908, so that it is connected to the holding member 1005. The position of the content hanging stud 910 can be determined without being limited by the outer dimension of the iron core 908.

The upper clamp of the present invention will be described with reference to FIGS. 10a and 10b.
When the contents of the transformer are stored in the lifting tank, the two contents hanging studs serve as fulcrums, and the suspended transformer contents may shake.

In particular, since there are many products that are 10 mm or less between the outer circumference of the transformer contents and the inner circumference of the tank, it is necessary to stably transport the transformer contents without shaking.
FIG. 10 a shows an upper clamp 1001 a having a steel band through hole 1002 and a content hanging stud connection hole 1003.

  The inside hanging stud connection hole 1003 is located at the center in the depth direction of the upper clamp 1001a and is disposed on both sides in the horizontal direction. Moreover, it is provided as a hole longer in the horizontal direction than in the depth direction.

  For example, in the case of an oil-filled transformer having a capacity smaller than 500 kVA, since the mass of the transformer is smaller than that of a transformer having a capacity of 500 kVA or more, the swing width is relatively small when the transformer contents are lifted. Therefore, the content suspension stud connection hole 1003 can be provided on the upper clamp 1001a in line symmetry with respect to a line parallel to the short side at the center of the upper clamp 1001a.

  Further, the content suspension stud connection hole 1003 is provided between the first steel band through hole 1002 arranged on the upper side of FIG. 10a and the second steel band through hole 1002 arranged on the lower side of FIG. 10a. Yes.

  Since one content hanging stud connection hole 1003 can be provided at each end of the upper clamp 1001 between the first and second steel band through holes 1002, the number of holes can be reduced. In addition, the strength can be secured and the length of the upper fastener 1001 in the short side direction can be reduced.

  Next, as a modified example, FIG. 10B shows an upper fastener 1001b having a steel band through hole 1002 and contents hanging stud connection holes 1003a and 1003b. A different point from the previous example is that two holes 1003a and 1003b for hanging hanging studs are provided between the steel band passage holes 1002 at both ends in the horizontal direction of the upper clamp 1001b.

  For example, in the case of an oil-filled transformer having a capacity greater than 500 kVA, the mass of the transformer is larger than that of a transformer having a capacity of less than 500 kVA, so that the swing width increases when the transformer contents are lifted. In addition, since the mass is large, it is often desirable to reduce the swing width.

  On the other hand, if the content suspension stud connection holes 1003a and 1003b are provided on the upper clamp 1001b in a point-symmetric manner, a line connecting the two content suspension studs and a horizontal line at the center of the transformer content are obtained. Since they cross at different angles, they can be made difficult to touch when lifted.

  Therefore, the safety of transportation of the transformer contents can be improved. Since the swing of the transformer contents is reduced, the workability of transporting the transformer contents can be improved. Furthermore, it becomes easy to avoid that the content of a transformer contacts a tank.

  In addition, by providing point symmetry, the contents suspension stud 910 shown in FIG. 9 can be assembled without worrying about the vertical direction of the upper clamp, so that the workability during assembly is improved. It also contributes to the sharing of parts.

  Furthermore, since the transformer contents can be made difficult to touch, the distance between the outer circumference of the transformer contents and the inner circumference of the tank can be reduced.

  10B shows an example in which four holes are provided so that the contents hanging stud connection holes 1003a and 1003b are point-symmetrical. Only one may be provided.

A modification of the upper clamp will be described with reference to FIG.
The basic structure is the same as in FIG. A different point is the structure of the content hanging stud connection hole 1003c.

  The inside hanging stud connection hole 1003c is provided in a substantially horizontal direction and extends to the outer periphery in the horizontal direction of the upper clamp 1001c. Accordingly, it is not necessary to insert the upper clamp 1001c from above the content suspension stud, so that the upper clamp, the steel band, and the holding member can be adjusted together, and workability is improved.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, it is possible to add, delete, and replace other configurations and materials for a part of the configuration of each embodiment.

101, 301, 601, 901, 1001 ... Upper clamps 102, 302, 602, 902, 1002 ... Steel band through holes 103, 303, 603, 1003, 1003a, 1003b ... Content suspension stud connection holes 104, 304, 604 , 904 ... Steel bands 105, 305, 605, 905 ... Holding members 106, 306, 606, 906 ... Lower clamps 107, 307, 607, 907 ... Coil supports 108, 308, 608, 908 ... Winding cores 109, 309, 609, 909 ... Coil 110, 310, 610, 910 ... Content hanging stud

Claims (9)

A transformer having an iron core,
An upper clamp disposed at the top of the iron core;
At the upper corner of the iron core, a holding member disposed between the upper fastening metal fittings,
A lifting member connected to the holding member and lifting the iron core from above,
The upper clamp has a hole that passes through the lifting member and the steel band through hole,
The lifting member passes through the passing hole,
A transformer having a steel band that passes through the steel band through hole and holds the iron core, the holding member, and the upper fastener. The transformer according to claim 1, wherein
The holding member has an upper surface portion to which the lifting member is connected, and a side surface portion disposed between the iron core and the coil connected to the upper surface portion,
Transformer characterized by The transformer according to claim 2, wherein
The passing hole is a hole extending in a horizontal direction of the transformer. The transformer according to claim 2, wherein
The transformer is characterized in that the passing hole is a long hole having different vertical and horizontal lengths. The transformer according to claim 3 or 4,
The hole through which the lifting member passes is a hole extending to the end of the upper clamp. The transformer according to claim 2, wherein
The length of the said side part exists from the said upper surface part to the lower end part of the coil wound around the said iron core, The transformer characterized by the above-mentioned. The transformer according to claim 1,
The transformer is characterized in that the passing hole is disposed at a substantially point-symmetrical position with respect to the center of the upper fastener. The transformer according to claim 1,
The upper clamp has a first steel band through hole and a second steel band through hole among the steel band through holes,
The through hole is provided between the first steel band through hole and the second steel band through hole. The transformer according to claim 1,
The iron core member is an amorphous ribbon,
A transformer, wherein a coil support plate is provided between the holding member and an upper end portion of a coil wound around the iron core.

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