WO2018029922A1

WO2018029922A1 - Transformer

Info

Publication number: WO2018029922A1
Application number: PCT/JP2017/017365
Authority: WO
Inventors: 康真島; 年樹白畑; 淳治小野; 洋悦椎名; 亮太須貝
Original assignee: 株式会社日立産機システム
Priority date: 2016-08-09
Filing date: 2017-05-08
Publication date: 2018-02-15
Also published as: JP6649492B2; JPWO2018029922A1

Abstract

The purpose of the present invention is to provide an oil-filled transformer in which upper and lower transformers have the same capacity, the transformer having a structure such that upper and lower flow passageways for insulating oil are ensured while a lower first coil is retained. The transformer of the present invention comprises a first core, a second core disposed on the first core, a first coil wound on the first core, and a second coil wound on the second core, the transformer being characterized by comprising: a first core-pressing member pinching a first surface of the first core and a second surface opposing the first surface; a second core-pressing member pinching a third surface of the second core and a fourth surface opposing the third surface; and a column which is disposed on the outside of the first coil and the second coil, and which is longer than the sum of the height of the first coil, the distance from a lower surface of the first coil to a lower surface of the first core, the height of the second coil, the height of the first core-pressing member, and the height of the second core-pressing member, wherein the first core-pressing member and the second core-pressing member are connected to the column.

Description

Transformer

The present invention relates to an oil-filled transformer in which coils are stacked in a plurality of stages.

In the field of transformers, the stacked coil structure is a method of arranging coils in a plurality of circuits, and means a structure in which a second coil of a circuit different from the first coil is arranged on the first coil. . Moreover, the winding temperature rise limit of the coil is determined for the transformer, and it is necessary to suppress the upper and lower coils within the winding temperature rise limit.

Patent Document 1 states that “a container filled with an insulating gas at a predetermined pressure, a transformer housed in the container and fixed to the bottom plate of the container via a lower iron core clamp, and a relative longitudinal length of the container. A gas-insulated transformer comprising: a fixed hardware for holding an upper core fastening metal of the transformer fixed at both ends to a reinforcing metal provided in the vicinity of the center of the vertical side plate in the vertical direction. (See the scope of “)”.

JP-A-1-293506

In an oil-filled transformer that houses a lower first coil and an upper second coil in a container (tank) containing insulating oil, a transformer having a lower first coil and an upper second coil When the transformer having the same capacity has the same capacity, the temperature on the upper coil side tends to rise.

In addition, since convection is less likely to occur in insulating oil than in gas, in the case of an oil-filled transformer, it is necessary to provide a flow path between a lower stage and an upper stage as compared with a gas-insulated transformer.

Patent Document 1 (Japanese Patent Application Laid-Open No. 1-293506) discloses a gas-insulated transformer, and an upper-stage small-capacity transformer 4 is mounted on a lower-stage large-capacity transformer 2. Further, since the small-capacity transformer 4 is mounted on the fixed hardware 3 and the reinforcing hardware 1e connected to the fixed hardware 3 is joined to the side plate 1d by welding, the container as shown in FIG. 2 and FIG. The flow path of the 1 side plate 1d is not provided.

This is because the structure of Patent Document 1 has a large-capacity transformer 2 in the lower stage, but a small-capacity transformer 4 is arranged in the upper stage, so that the temperature on the upper stage is higher than that on the lower stage. This is considered to be because only the side surface in FIG. 1 is sufficient because convection is likely to occur because it is not insulated or is insulated with gas. That is, the upper and lower stages are transformers of equivalent capacity, and the structure in the case of using insulating oil is not considered.

An object of the present invention is an oil-filled transformer having an equivalent capacity of upper and lower transformers, and a transformer having a structure that secures upper and lower flow paths of insulating oil while holding the lower first coil. Is to provide.

As an example of the present invention, a first iron core having a plurality of iron core blocks, a second iron core disposed on the first iron core, a first coil wound around the first iron core, A transformer having a second coil wound around the second iron core, the first iron core sandwiching the first surface of the first iron core and the second surface facing the first surface On the outside of the holding member, the second iron core holding member that sandwiches the third surface of the second iron core and the fourth surface facing the third surface, the outside of the first coil and the second coil The height of the first coil, the lower surface of the first coil to the lower surface of the first iron core, the height of the second coil, the height of the first iron core holding member, and the second iron core holding member A pillar longer than the sum of the heights, and the pillar is connected to the first iron core holding member and the second iron core holding member. And butterflies.

As an example of the present invention, a first iron core having a plurality of iron cores, a second iron core disposed on the first iron core, a first coil wound around the first iron core, and a second A transformer having a second coil wound around the first iron core, the first iron core fastener contacting the upper side of the first surface of the first iron core, and facing the first surface A second iron core fastener contacting the upper side of the second surface, a third iron core fastener contacting the lower side of the third surface of the second iron core, and a second facing the third surface A fourth iron core fastener that contacts the lower side of the fourth surface, and a space is provided between the first iron core and the second iron core.

According to the present invention, in an oil-filled transformer having an equivalent capacity of upper and lower transformers, a transformer having a structure for securing the upper and lower flow paths of insulating oil while holding the lower first coil. Can be provided.

It is a perspective view which is an example of the Example of the transformer of this invention. It is a top view which is an example of the Example of the transformer of this invention. It is a front view which is an example of the Example of the transformer of this invention. It is a side view which is an example of the Example of the transformer of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted.

Further, 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, but they are not irrelevant to each other unless otherwise specified. The other part or all of the modifications, details, supplementary explanations, and the like are related.

Also, in the following embodiments, when referring to the number of elements (including the number, numerical value, quantity, range, etc.), particularly when clearly indicated and when clearly limited to a specific number in principle, etc. Except, it is not limited to the specific number, and it may be more or less than the specific number.

Further, in the following embodiments, the constituent elements (including element steps) are not necessarily indispensable unless otherwise specified and clearly considered essential in principle. Needless to say.

Further, in the following embodiments, regarding constituent elements and the like, when “consisting of A”, “consisting of A”, “having A”, and “including A” are specifically indicated that only those elements are included. It goes without saying that other elements are not excluded except in the case of such cases. Similarly, in the following embodiments, when referring to the shapes, positional relationships, etc. of the components, etc., the shapes are substantially the same unless otherwise specified, or otherwise apparent in principle. And the like are included. The same applies to the above numerical values and ranges.

Among the transformers with the stacked coil structure described above, when the upper and lower coils are operated in parallel, the operation balance is lost, so it is necessary to approximate the impedance value of each transformer. The impedance generally changes when the structure and structure such as the coil size and the number of turns are changed. Therefore, it is desirable that the upper and lower coils have a similar structure around the coil.

Also, since the insulating oil in the tank has a higher temperature around the upper coil than the lower coil, it is better to bring the upper and lower temperatures as close as possible by convection of the insulating oil in the tank. That is, in the multistage coil structure transformer, a space for generating convection of insulating oil in the tank is required. In the present specification, the tank is also simply referred to as a container.

FIG. 1 is a perspective view which is an example of an embodiment of a transformer of the present invention and is a diagram showing no tank. This is a so-called three-phase tripod structure. Moreover, FIG. 2 is a figure which shows a tank by the top view which is an example of the Example of the transformer of this invention. 2 to 4 show the tank 108 and the insulating oil 109 accommodated in the tank 108, but are omitted in FIG. 1 for convenience.

Unless otherwise specified, a method of stacking silicon steel plates or amorphous metal on a block and stacking them, that is, a transformer having an iron core with a stacked core structure will be described. However, the present invention is not used only for an iron core having a stacked core structure, but can also be used for a transformer having a wound core type iron core.

A lower first coil 104 and an upper second coil 101 are shown, and the upper second coil 101 is wound around an upper iron core 102. A so-called outer iron core is shown in FIG. 1, but an inner iron core is disposed inside the outer iron core.

Further, although FIG. 1 is not shown because it is a perspective view, a coil 104 is wound around the lower iron core 105. The manner in which the coil 104 is wound around the lower iron core 105 is shown in FIGS.

The upper iron core 102 is sandwiched between a pair of upper fasteners 103. The upper clamp 103 is attached to the column 107. Fasteners such as the upper stage fastener 103 are also called iron core restraints or simply restrainers, and the columns 107 are also called restrainers. These attachment methods are connected by bolts or welding. The column 107 is not limited to a U-shape, and may be a square member. In this specification, the column 107 is called a column, but may be a member extending in the vertical direction.

Also, the fastener is U-shaped as shown. For example, a third middle-stage fastener 204 described later has a U-shaped central surface connected to the column 107, a U-shaped upper surface facing the coil 101, and a U-shaped lower surface facing the coil 104. The square shape is not limited to the U shape, but a square shape with four surfaces may be used. However, if sufficient rigidity is obtained as a member, the U shape is desirable in consideration of weight reduction and workability of attaching other members.

The lower iron core 105 is sandwiched between a pair of lower clamps 201. The lower clamp 201 is attached to the column 107. The bottom surface of the lower first coil 104 may be placed on the lower clamp 201 via an insulating member.

When the lower iron core 105 is an amorphous core, the coil 104 is less likely to give its own weight to the lower iron core 105, and the characteristics of the lower iron core 105 can be improved. The insulating member may be disposed between the coil 104 or the lower clamp 201 and may be implemented by applying a resin member to one of the members.

Between the coil 101 and the coil 104, a middle stage clamp 106 is attached. The middle stage clamp 106 has four members.

The first middle clamp 202 is attached to the first surface side of the lower iron core 105, and the second middle fastener 203 is attached to the second surface facing the first surface of the lower iron core 105. These middle clamps 202 and 203 sandwich the lower iron core 105 and are attached to the pillar 107.

The third middle clamp 204 is attached to the third surface side of the upper iron core 102, and the fourth middle fastener 205 is attached to the fourth surface facing the third surface of the upper iron core 102. These

intermediate clamps

204 and 205 sandwich the upper iron core 102 and are attached to the pillar 107. The first surface and the third surface are substantially the same plane. Alternatively, the second surface and the fourth surface are substantially the same plane.

Here, the first intermediate clamp 202 and the second intermediate clamp 203 are collectively referred to as a pair of the first iron core holding members 106, the third intermediate clamp 204 and the fourth intermediate clamp 205 are collectively referred to. The pair of second iron core pressing members 106 are also called. That is, the pair of first iron core holding members 106 are arranged so as to sandwich the lower iron core 105, and the pair of second iron core holding members 106 are arranged so as to sandwich the upper iron core 102.

The first middle clamp 202 and the third middle clamp 204 can be integrated, but are desirably arranged independently. This is because the first middle stage fastener 202 can fasten the lower iron core 105 and the third middle stage fastener 204 can fasten the upper iron core 102 independently.

The first surface and the third surface may deviate due to manufacturing variations of the upper iron core 102 and the lower iron core 105 and the surrounding structure. However, the first and third surfaces can be sandwiched independently without worrying about this variation. It is.

The third middle-stage fastener 204 and the fourth middle-stage fastener 205 may be placed on the first middle-stage fastener 202 and the second middle-stage fastener 203. Because the third and fourth middle clamps 204 and 205 are attached to the pillar 107, and are placed on the first and second middle clamps 202 and 203, they can be stably supported. is there.

That is, the upper surface of the third middle clamp 204 and the upper surface of the fourth middle clamp 205 serve as holding surfaces for the coil 101 and the upper iron core 102.

That is, since the intermediate clamp 106 is held by the pillar 107 and the second coil 101 is mounted on the upper surface of the intermediate clamp 106, the weight of the coil 101 does not directly affect the coil 104.

Therefore, the structure around the lower first coil can be simplified. In addition, a space for convection of insulating oil can be secured on the side surface portion. Furthermore, since the weight of the coil 101 does not affect the coil 104, the structure around the coil 104 can be made the same as the structure of the coil 101, so that parts can be shared, so that the quality can be improved. it can. As a result, since the structure can be simplified as the entire upper and lower stages, the entire transformer contributes to weight reduction.

With the above structure, the portion fixed to the tank 108 can be reduced as much as possible, so that the insulating oil 109 is easily convected. In addition, the upper and lower flow paths that require convection, that is, the flow path around the middle-stage fastener 106 can be secured. Furthermore, even when the column 107 and the tank 108 are connected, the periphery of the middle-stage fastener 106 can be avoided, and the periphery of the upper-stage fastener 103 and the lower-stage fastener 201 can be fixed.

When the periphery of the upper clamp 103 is fixed, it can be stabilized in the structure of a multistage transformer that increases in the vertical direction. Further, the shock resistance can be improved by arranging a shock absorbing member such as a damper in consideration of seismic isolation and shock resistance on the upper clamp 103 side. The column 107 and the upper clamp 103 can be fixed to the lid on the upper side of the tank 108. In this case, the earthquake resistance can be improved.

In addition, it is preferable to provide a space so that the bottom surfaces of the first middle clamp 202 and the second middle clamp 203 do not contact the top surface of the lower coil 104. As a result, the

intermediate clamps

202 and 203 do not apply a load to the coil 104. Further, when the coil 104 is vibrated or deformed during the operation of the transformer, the

intermediate clamps

202 and 203 are not touched. A laminated steel core structure of a silicon steel plate is effective because it is less affected by the distortion of the iron core than an amorphous wound core.

In other words, a space is provided on the upper surface of the third middle stage fastener 204 and the lower surface of the second coil 101. In addition, since insulating oil is accommodated in the tank 108, the space is filled with insulating oil.

Here, in FIG. 2, a space is shown between the column 107 and the upper clamp 103, but a fixing member (not shown) is provided between the column 107 and the upper clamp 103. The fixing member may be a bolt or a welded portion, but an elastic member and a width (vertical direction in FIG. 2, horizontal direction in FIG. 4) adjusting member are arranged so that the upper clamp 103 adjusts the tightening amount of the iron core 102. can do. Further, the middle stage clamp 106 and the lower stage clamp 201 can have the same structure.

FIG. 3 is a front view showing a tank as an example of the embodiment of the transformer of the present invention. This is a state viewed from the first surface of the lower iron core 105 and the third surface of the upper iron core 102.

An insulating oil 109 is accommodated in the tank 108. Further, the upper iron core 102 and the lower iron core 105, the upper coil 101, the lower coil 104, and the like described above are shown. A lower iron core 105 not shown in FIG. 1 is shown.

An example is shown in which a space is provided between the upper surface of the middle clamp 106 and the lower surface of the coil 101, and the lower surface of the middle clamp 106 and the upper surface of the coil 104. In this case, even if the coil 101 and the coil 104 are deformed during the operation of the transformer, the structure is advantageous in that it does not come into contact with the intermediate clamp 106.

FIG. 4 is a side view showing a tank as an example of an embodiment of the transformer of the present invention. The structure which provided the space above and below the middle stage | step fastener 106 similarly to FIG. 3 is shown.

Also, a space is provided between the upper iron core 102 and the lower iron core 105. Further, a third middle clamp 204 on the third surface of the upper core 102, a fourth middle clamp 205 on the fourth surface of the upper core 102, and a first middle clamp on the first surface of the lower core 105. The second middle clamp 203 is arranged in contact with the second surfaces of the bracket 202 and the lower iron core 105.

The lower surface of the third middle clamp 204 is in contact with the upper surface of the first middle clamp 202, and the upper surface of the second middle clamp 203 is in contact with the lower and second surfaces of the fourth middle clamp 205. ing. As described above, not only the pillar 107 but also the contact between them improves the mechanical stability.

Further, as in the example described with reference to FIG. 1, when the vertical length of the third middle clamp 204 is longer than the length from the lower surface of the coil 101 to the upper iron core 105, the lower surface of the coil 101 is the middle It is stable because it is placed on the fastener 106.

That is, it is possible to prevent the lower iron core 105 and the upper iron core 102 from contacting each other. In particular, when the lower iron core 105 is an amorphous core, the distortion of the amorphous core can be reduced and the core characteristics can be improved.

The lower clamp 201 can have the same configuration as the above-described middle clamp 106. This is particularly effective when an amorphous wound core is employed.

The column 107 extends from the lower coil 104, the lower surface of the lower coil 104 to the lower surface of the lower iron core 105, and the sum of the vertical lengths of the first middle metal fitting 202, the third middle metal fitting 204, and the upper iron core 105. If long, it can be implemented.

The upper clamp 103 can be implemented if it is at least partially connected to the column 107. However, if the column 107 is longer than the vertical clamp of the upper clamp 103, the upper clamp can be stably fixed. A metal fitting 103 can be attached. Thereby, the upper surface of the upper iron core 102 can be stably clamped between the third surface and the fourth surface by the upper metal fitting 103.

Here, even when the transformers have different capacities in the upper and lower stages, a common fastener can be used in the upper, middle, and lower stages, and the influence on the lower stage side where the upper stage side weight is easily affected can be reduced. it can. Furthermore, a common fastener can be used, and as described above, by changing the position where the middle-stage fastener 106 or the lower-stage fastener 201 is attached to the column 107, different effects can be realized depending on the structure or material of the iron core. it can.

Moreover, as a modification, when using a transformer with the same capacity in the upper and lower stages, the temperature of the oil in the tank is likely to be higher on the second coil side of the upper stage and lower on the first coil side of the lower stage, By adopting this structure, it is possible to secure a flow path through which the insulating oil in the tank convects the lower and upper stages.

The insulating oil convects between the lower and upper stages, and the upper coil ambient temperature and the lower coil ambient temperature are more easily averaged than when no convection occurs. That is, the impedance change due to the temperature difference around the coil can be reduced. As a result, the overall characteristics of the transformer are improved. In addition, the temperature on the upper coil side is lower than in the case where the flow path is not secured in the upper and lower stages, which contributes to improving the life of the entire transformer.

Further, since the bottom surface of the coil 101 is placed on the third middle-stage fastener 204, no load is applied to the coil 104, so that the coil characteristics can be improved. In addition, since the coil 101 is placed on the second intermediate clamp 204, the iron core around which the coil 101 is wound is not affected by the weight of the coil 101, and the iron core characteristics can be improved.

According to the embodiment described above, in the oil-filled transformer in which the upper and lower transformers have the same capacity, the transformer having a structure for securing the upper and lower flow paths of the insulating oil while holding the lower first coil. Can be provided. Further, the above-described structure is not limited to a transformer, and can be implemented with other static induction devices.

In the above embodiment, the upper and lower two-stage coil structure has been described. However, the structure of this embodiment can be stacked in a plurality of stages by having the relationship between the middle stage fastener 106 and the pillar 107, and more than three stages. A multi-stage transformer can be implemented.

As mentioned above, the invention made by the present inventors has been specifically described based on the embodiment of the invention. However, the present invention is not limited to the embodiment of the invention, and various modifications can be made without departing from the scope of the invention. Needless to say, it can be changed.

Note that the present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one 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 for a part of the configuration of each embodiment. Note that the members and relative sizes described in the drawings are simplified and idealized for easy understanding of the present invention, and may have a more complicated shape in mounting.

101: Upper coil 102: Upper iron core 103: Upper clamp 201: Lower clamp 202: First middle clamp 203: Second middle clamp 204: Third middle clamp 205: Fourth middle clamp 104: Lower coil 105: Lower iron core 106: Middle clamp 107: Column (holding metal)
108: Tank (container)
109: Insulating oil

Claims

A first iron core; a second iron core disposed on the first iron core; a first coil wound around the first iron core; and a second coil wound around the second iron core. A transformer having two coils,
A first iron core pressing member that sandwiches a first surface of the first iron core and a second surface facing the first surface;
A second iron core holding member that sandwiches the third surface of the second iron core and the fourth surface facing the third surface;
Outside the first coil and the second coil are the height of the first coil, the bottom surface of the first coil to the bottom surface of the first iron core, and the height of the second coil. And a column longer than the sum of the height of the first iron core holding member and the height of the second iron core holding member,
The transformer, wherein the first iron core holding member and the second iron core holding member are connected to the column.
The transformer of claim 1,
The second iron core holding member has a coil holding surface on which the second coil is placed.
The transformer according to claim 2,
The transformer, wherein the bottom surface of the second coil is placed on the top surface of the second iron core holding member.
The transformer according to claim 3,
The transformer, wherein the bottom surface of the second coil is in contact with the upper surface of the second iron core holding member.
The transformer of claim 1,
A transformer, wherein a space is provided between an upper surface of the second iron core holding member and a lower surface of the second coil.
A first iron core; a second iron core disposed on the first iron core; a first coil wound around the first iron core; and a second coil wound around the second iron core. A transformer having two coils,
A first iron core fastener that contacts the upper side of the first surface of the first iron core;
A second iron core fastener that contacts the upper side of the second surface facing the first surface;
A third core fastener that contacts the lower side of the third surface of the second core;
A fourth iron core fastener that contacts the lower side of the fourth surface facing the third surface;
With
A transformer characterized in that a space is provided between the first iron core and the second iron core.
The transformer according to claim 6, wherein
The transformer characterized in that the vertical direction of the third iron core fastener is longer than the length of the second iron core protruding from the lower surface of the second coil.
The transformer according to claim 7,
The upper surface of the third iron core fastener is in contact with the lower surface of the second coil.