JP5113420B2 - Transformer - Google Patents

Description

  The present invention relates to a transformer, and more particularly to a configuration for supporting a transformer body.

2. Description of the Related Art Conventionally, for example, in an oil-filled transformer, the transformer body is configured to support the core bottom portion and coil support piece in a box-like support (lower piece) disposed on the bottom side of the core. Is used. The box-shaped lower piece supports the bottom surface of the bottom of the core and the end surface of the coil support piece at the bottom surface thereof, and the bottom side surface of the core and the lower portion of the coil support piece at four closed side surfaces around the bottom surface portion. Covering.
Further, as a related art related to the present invention, there is a technique described in Japanese Patent Laid-Open No. 11-162752 (Patent Document 1), for example. In Japanese Patent Laid-Open No. 11-162752, as a winding support device for a transformer, the upper and lower yoke portions of an iron core (core) are fitted and supported by fitting jigs 10 and 10a from above and below, The fitting jigs 10 and 10a are engaged with the pair of fastening metal fittings 13 and 13a provided with the engaging grooves 12 and 12a perpendicular to the corner portions, and the engaging grooves 12 and 12a, and the iron core legs are engaged. A configuration is described in which the winding 5 wound around the portion is formed from winding support pieces 11 and 11a that are pressed and fixed in the axial direction.

Japanese Patent Application Laid-Open No. 11-162752

  Among the prior arts described above, in the configuration in which the transformer body is supported by the box-shaped support (lower piece), the four side surfaces of the support are closed, so that the oil in the tank is transferred to the box-shaped support. It is difficult to flow inside, and the amount of heat generated in the core itself or the heat transmitted from the coil to the core into the oil liquid is reduced, and the cooling effect of the oil liquid may be reduced. In addition, the box-like support body needs to have a size capable of accommodating the coil support piece, and the size and weight are likely to increase. An increase in the size and weight of the support causes an increase in the overall size and weight of the oil-filled transformer. Further, the technique described in the above-mentioned Japanese Patent Application Laid-Open No. 11-162752 has a configuration in which the winding support pieces 11 and 11a are engaged with the engagement grooves 12 and 12a of the fastening fittings 13 and 13a, and the fitting treatment is performed. Since it is the structure which provides the tools 10 and 10a, the structure of the support part of a transformer main body becomes complicated, an assembly operation takes time, and there exists a possibility of leading to an increase in cost.

The subject of this invention is making it the simple structure which is easy to manufacture in the transformer which suppressed the increase in a dimension and a weight in the transformer in the transformer in view of the situation of the said prior art.
An object of the present invention is to solve the above problems and provide a transformer with high productivity.

In order to solve the above-described problems, in the present invention, as a transformer configured to support a transformer body in oil liquid in a tank, an upper piece above the core, a flat coil support piece below the coil, a core A lower piece is provided on the bottom side, and the upper piece and the lower piece are connected to each other by a strip-like connecting member on the plane in the width direction of the core. In particular, the lower piece is connected to the bottom of the core and the coil. A bottom surface portion for supporting the end surface of the support piece; and a side surface portion that is formed in four directions orthogonal to the bottom surface portion and acts to restrain the coil support piece, and the side surface portion is on a front end side of the plane. The side length of the plane is shorter than the side length on the base side of the plane, and of these, two opposing side surfaces along the plane of the coil support piece each have a plane that is outside the coil support piece. And inclined with respect to the plane of the coil support piece. The side or root side of the one side portion between the one side portion and the coil support piece in a state in which the tip portion on the inner surface side of the side portion is in contact with the plane of the coil support piece Forming a gap penetrating in the direction along the side of the coil, allowing the oil liquid to flow through the gap, and each of the other two opposite side faces between the opposed faces of the coil support piece. It is set as the provided structure.

  According to the present invention, a transformer with good productivity can be provided.

Embodiments of the present invention will be described below with reference to the drawings.
1-6 is explanatory drawing of the Example of this invention. 1 is a diagram showing a configuration example of a transformer as an embodiment of the present invention, FIG. 2 is a front view of the transformer of FIG. 1, and FIG. 3 is a support member of a transformer body in the transformer of FIG. FIG. 4 is a side view showing a support state by a support member of the transformer main body in the transformer of FIG. 1, FIG. 5 is an explanatory view of the effect of the support member in the transformer of FIG. 6 is an explanatory diagram of a manufacturing procedure of a lower piece of a support member in the transformer of FIG. 1. In this embodiment, the case where the transformer is an oil-filled transformer will be described.

In FIG. 1, 100 is an oil-filled transformer as an embodiment of the present invention, 10 is a tank, 1 is an annular core that forms a magnetic path in the transformer body of the oil-filled transformer 100, and 2a and 2b are respectively The coil is wound around the core 1 and constitutes a transformer body together with the core 1, wherein 2a is a primary side coil and 2b is a secondary side coil. In addition, 3 is an upper piece disposed above the zenith portion of the core 1 and has a U-shaped cross section and covers the zenith portion, 6a and 6b are each made of a non-magnetic insulating material, and the coils 2a and 2b Below the lower end face, the core 1 is disposed on both sides of the core 1 along the plane (ZX plane) 1b ₁ , 1b ₂ and supports the lower end face of the coils 2a, 2b. to flat coil support piece (coil supporting piece 6a is disposed in the plane 1b ₁ side in the thickness direction to the core 1, the coil support pieces 6b are distribution in a planar 1b ₂ side in the thickness direction with respect to the core 1 4) is a lower piece that is arranged on the bottom side of the core 1 and supports the bottom of the core 1 and the end faces of the coil support pieces 6a and 6b. The lower piece 4 is formed in a substantially rectangular bottom surface portion, and is continuously formed on the four sides of the bottom surface portion so that the plane thereof faces the lower end surface of the coils 2a and 2b. The side length on the front end side of each of the four sides is made shorter than the side length on the base side of the plane continuous with the bottom surface portion, or has four side portions in which a gap is formed between adjacent sides. Of the four side surfaces, one of the two side surfaces facing each other is provided outside the coil support pieces 6a and 6b with the plane thereof being along the plane of the coil support pieces 6a and 6b. The other two side portions facing each other are provided between the opposing surfaces of the coil support pieces 6a and 6b with their planes being substantially perpendicular to the respective planes of the coil support pieces 6a and 6b. 5a and 5b are strip-shaped connecting members, arranged outside the coils 2a and 2b and along the plane (YZ plane) 1a ₁ and 1a ₂ in the width direction of the core 1, The upper piece 3 and the other two side portions of the lower piece 4 are connected. 7a is a bolt for connecting the connecting member 5a to the upper piece 3, 7b is a bolt for connecting the connecting member 5b to the upper piece 3, and 7c is a bolt for connecting the connecting member 5b to the lower piece 4. The upper piece 3, the coil support pieces 6a, 6b, the lower piece 4, the connecting members 5a, 5b and the bolts constitute a support member for supporting the transformer body. The coil support pieces 6a and 6b are made of, for example, wood or a resin material, and the upper piece 3, the lower piece 4, and the connecting members 5a and 5b are made of, for example, a steel material.

In the lower piece 4, of the four side portions, the case which is one side surface portion 4a of the one of the two side portions of the opposing side length Wa _t of the distal end 4a _t of the plane, It is shorter than the side length Wab root 4a _b of the flat surface, and,該辺length Wa _b is set to be shorter than the length Ws ₁ in the X-axis direction of the coil supporting piece 6a. In this embodiment, the side surface portion 4a is trapezoidal, trapezoidal top tip 4a _t, root 4a _b forms a trapezoidal bottom portion _4a 1, 4a ₂ connecting the tip 4a _t and the base 4a _b are A straight hypotenuse is formed. Although not shown in FIG. 1, in the case of the side part facing the side part 4a, the side length at the tip of the plane is made shorter than the side length at the base of the plane, as in the side part 4a, and The side length at the base of the plane is made shorter than the length of the coil support piece 6b in the X-axis direction. In this embodiment, the plane is trapezoidal. Of the four side surfaces, the other two opposite side surfaces (the side surface 4d and the side surface opposite thereto) provided between the opposing surfaces of the coil support pieces 6a and 6b are also formed at the front end of the plane. The side length is made shorter than the base side length of the plane, and in the case of the present embodiment, it has a trapezoidal shape. With this configuration, a gap is formed between adjacent sides (slanted sides) of each side surface portion.
In the following description, the same reference numerals as those in FIG. 1 are used for the components in FIG. 1 used in the description.

FIG. 2 is a front view (ZX plan view) of the oil-filled transformer 100 of FIG.
In FIG. 2, 4 c and 4 d are the other two side surfaces facing each other provided between the opposing surfaces of the coil support pieces 6 a and 6 b in the lower piece 4, and 4 c is a plane in the width direction of the core 1. (YZ plane) 1a The side part 4d arranged on the ₁ side is a side part arranged on the plane (YZ plane) 1a ₂ side in the width direction of the core 1. Reference numeral 7 d denotes a bolt that couples the connecting member 5 a to the side surface portion 4 c of the lower piece 4. Other reference numerals are the same as those in FIG. Side portion 4c, the distance Wc _d between 4d, is longer than the side length Wa _b of the base 4a _b of the plane of the side surface portion 4a, the length Ws ₁ in the X-axis direction of the coil supporting piece 6a is the side surface portion 4c is longer than the distance Wc _d between 4d. The relationship between the side surface portions 4c and 4d, the side surface portion facing the side surface portion 4a, and the coil support piece 6a is also the same.
In the following description, the components in FIG. 2 used in the description are used with the same reference numerals as in FIG.

FIG. 3 is a perspective view showing a support state of the transformer body in the oil-filled transformer 100 of FIG. 1 by a support member. In FIG. 3, 4 e is a bottom surface portion of the lower piece 4.
Hereinafter, the same reference numerals as those in FIG. 3 are used for the components in FIG. 3 used in the description.

FIG. 4 is a side view showing a support state of the transformer body in the oil-filled transformer 100 of FIG. 1 by a support member.
In FIG. 4, 4b is a side portion opposite to the side surface portion 4a in the lower piece 4, 4b _t is the tip of the side surface portion 4b, 4b _b is the base of the side surface portion 4b. _Further, 4d 1, 4d _2, respectively, the portion connecting the leading end 4d _t and該根original 4d _b of the side surface portion 4d (hereinafter, referred to as the inclined portion) is. In this embodiment, the side surface portion 4d is also trapezoidal shape, the tip 4d _t is trapezoidal top and root 4d _b form a trapezoidal bottom, the inclined portion 4d _1, 4d ₂ respectively forms a straight hypotenuse ing. Also, _{h a} is, Z-axis direction of the height of the side surface portion 4a, _{h b} is, Z-axis direction of the height of the side portions 4b, _{h d} is, Z-axis direction of the height of the side surface portion 4d, Ws ₃ is , coil supporting pieces 6a, 6b facing interplanar distance, _{4d 10} is the root 4d _b inner portion in a in part in contact with the coil supporting member 6a of the inclined portion 4d ₁ of the side surface portion 4d, _{4d 20} is the side surface portion 4d part a root 4d _b inner portion of the inclined portion 4d ₂ in contact with the coil supporting pieces 6b, theta _a is corner side surface portion 4a forms a bottom surface portion 4e, theta _b is corner side surface portion 4b formed between the bottom surface portion 4e It is.

4, the side length Wd _b of the base side portion 4d is longer than the coil support pieces 6a, 6b facing surface distance Ws ₃ of. The same applies to the side surface portion 4d. The side surface portions 4a, each height h _a of _4b, h _b is substantially the same height with each other, are higher than the height h _d of the side surface portion 4d. Similarly, the height of the height-h _a, h _b is the (side surface portion 4d which is higher than the height of the side surface portion 4c which is opposed to the side surface portion 4d height h _d and side portions 4c Are substantially the same).

In part _{4d 10} inclined portion 4d ₁ of the side surface portion 4d is in contact with the coil supporting member 6a, the inclined portion 4d ₁ is a state in which bites into the coil supporting piece 6a, likewise, the inclined portion 4d ₂ is in contact with the coil supporting pieces 6b in part _{4d 20,} the inclined portion 4d ₂ is in a state in which bites into the coil support piece 6b. In this state, the coil support pieces 6a and 6b are fixed to the lower piece 4, respectively.

Also, angle theta _a, theta _b respectively, the corner portion _{c a} root 4ab of the side surface portion 4a of the lower piece 4, the side surface portion 4b base 4b _b corners _{c b} value eg 70 ° corresponding to the radius of curvature R at the The value is within a range of ˜85 °. Side section 4a near the tip 4a _t of the inner surface in a state in which form such a corner theta _a comes into contact with the plane of the coil supporting member 6a, which supports the coil supporting member 6a. At this time, the lower end surface of the coil supporting piece 6a is positioned just before portion approaches the corner c _a root 4a _b of the side surface portion 4a. Similarly, the side surface portion 4b is near the inner surface of the tip 4bt in a state in which angled theta _b comes into contact with the plane of the coil supporting pieces 6b, supporting the coil supporting pieces 6b. At this time, the lower end surface of the coil supporting pieces 6b is positioned just before portion approaches the corner c _b of the base 4b _b of the side surface portion 4b. When the angles θ _a and θ _b are further reduced, the dimension in the Y-axis direction of the bottom surface portion 4e of the lower piece 4 is increased, and the weight and dimensions of the entire support member are increased. The side surfaces 4a and 4b form angles θ _a and θ _b smaller than 90 °, respectively, so that the coil support piece 6a and the side surface portion 4a and the coil support piece 6b and the side surface portion 4b are respectively disposed. , Gaps Sa and Sb are formed. The gaps Sa and Sb are formed between the adjacent hypotenuses that penetrate in the X-axis direction and between adjacent side surfaces, that is, between 4a and 4c, between 4a and 4d, between 4b and 4c, and between 4b and 4d. It is a space that communicates with the gap, and allows fluid to flow in the X-axis direction (± X-axis direction) in the tank 10.

When the side surface portions 4a and 4b stand upright with respect to the bottom surface portion 4e (hereinafter, the side surface portions 4a and 4b in this case are referred to as side surface portions 4a ′ and 4b ′), as shown in FIG. The portions 4a ′ and 4b ′ form gaps g _a and g _b between the coil support pieces 6a and 6b, and do not contact the coil support pieces 6a and 6b. For this reason, the side surface portions 4a ′ and 4b ′ do not exert a binding force on the coil support pieces 6a and 6b, and the coil support pieces 6a and 6b are easily inclined and displaced together with the transformer body. In FIG. 5, 6 b ′ shows the coil support piece 6 b when tilted. In contrast, in the oil-filled transformer 100 of FIG. 1, as shown in FIG. 4, the side surfaces 4 a and 4 b are respectively relative to the bottom surface 4 e so as to form angles θ _a and θ _b smaller than 90 °. to inclined from the upright direction, the coil supporting piece 6a, respectively 6b, the tip _4a t, contact near the 4b _t, the gap Sa, the coil support piece 6a in a state of forming the Sb, and 6b restraint To do. As a result, the coil support pieces 6a and 6b are prevented from being tilted and displaced.

FIG. 6 is an explanatory diagram of a manufacturing procedure of the lower piece 4 of the support member in the oil-filled transformer 100 of FIG.
First, a square ABCD steel plate having a size corresponding to the size of the lower piece 4 is prepared, and then the four corners of this steel plate are cut into a triangle shape (triangle AEL, triangle BGF, triangle CIH and triangle DKJ are cut). Octagonal EFGHIJKL is formed. Next, the octagon EFGHIJKL is bent at each part of the straight line MN, the straight line OP, the straight line QR, and the straight line ST, and the side EF, the side GH, the side IJ, and the side KL are directed to the Z-axis direction side, and the plane EFNM is angled theta _a to the plane MNOPQRST, plane IJRQ is, so that the plane MNOPQRST angled theta _b. It is assumed that the straight line MN, the straight line OP, the straight line QR, and the straight line ST are set at positions where the height dimension of each of the side surface parts 4a, 4c, 4b, and 4d and the planar dimension of the bottom surface part 4e are secured. Thus, the plane MNOPQRST (in this embodiment, the shape of the plane MNOPQRST is referred to as a substantially square shape) is the bottom surface portion 4e, the plane EFNM is the side surface portion 4a, the plane IJRQ is the side surface portion 4b, the plane GHPO is the side surface portion 4c, and the plane KLTS is A lower piece 4 having a side surface portion 4d is formed. The side FN is the hypotenuse 4a ₁ of the side surface portion 4a in a plane EFNM, sides EM the hypotenuse 4a _2, the sides EF tip 4a _t, sides MN may correspond respectively to the base 4a _b, sides LT in a plane KLTS the side portions the hypotenuse 4d ₁ of 4d, the sides KS hypotenuse 4d _2, the sides KL tip 4d _t, sides ST corresponds respectively to the base 4d _b. The same applies to the plane IJRQ and the plane GHPO. Further, there are gaps between two adjacent sides, that is, between the side FN and the side GO, between the side HP and the side IQ, between the side JR and the side KS, and between the side LT and the side EM. It is formed. In this way, the lower piece 4 is easily manufactured.

  According to the embodiment described with reference to FIGS. 1 to 6, it is possible to provide an oil-filled transformer that has good productivity, ensures fluid flow, and can perform effective cooling and insulation.

  In addition, in the said Example, although demonstrated about the case where a transformer was an oil-filled transformer, this invention is not limited to an oil-filled transformer. In addition, although the four side surfaces of the lower piece 4 in the support member that supports the transformer main body have a trapezoidal shape, the present invention is not limited to this, and some of the side surface portions have a trapezoidal shape, and other side surface portions. May have a shape other than a trapezoid, or all side portions may have a shape other than a trapezoid. Further, the tip and the hypotenuse of the side part may be curved.

It is a figure which shows the structural example of the transformer as an Example of this invention. It is a front view of the transformer of FIG. It is a perspective view which shows the support state by the supporting member of the transformer main body in the transformer of FIG. It is a side view which shows the support state by the supporting member of the transformer main body in the transformer of FIG. It is explanatory drawing of the effect of the supporting member in the transformer of FIG. It is explanatory drawing of the manufacture procedure of the lower piece of the supporting member in the transformer of FIG.

Explanation of symbols

100 ... Oil-filled transformer,
1 ... Core,
2a, 2b ... coil,
3 ... Upper piece,
4 ... Lower piece,
4a, 4b, 4c, 4d ... the side surface of the lower piece,
5a, 5b ... connecting member,
6a, 6b ... coil support pieces,
10 ... Tank.

Claims (7)

A transformer having a configuration in which the transformer body is supported by a support member in the oil liquid in the tank ,
The transformer body is
An annular core forming a magnetic path;
A coil wound around the core;
Comprising
The supporting member is made of a non-magnetic insulating material, and is arranged on both sides of the core along the plane in the thickness direction of the core below the lower end face of the coil, A flat coil support piece for supporting the end face;
An upper piece arranged above the zenith portion of the core and covering the zenith portion;
A bottom surface portion arranged on the bottom side of the core and supporting the bottom portion of the core and the end surface of the coil support piece, and a side surface portion formed in four directions orthogonal to the bottom surface portion to act on the coil support piece. The side surface portion has a side length on the front end side of the plane shorter than a side length on the base side of the plane, and one of the two opposing ones along the plane of the coil support piece. Each of the side surfaces is inclined with respect to the plane of the coil support piece outside the coil support piece, and the tip on the inner surface side of the one side surface is in contact with the plane of the coil support piece. And forming the gap penetrating in the direction along the tip side or the root side of the one side surface portion between the one side surface portion and the coil support piece, and passing through the gap. flow and allow the, also, each two opposite other side portion該Ko The lower piece of the structure provided between the facing surfaces of the Le support piece,
A strip-shaped connecting member that is disposed on the outer side of the coil and along a plane in the width direction of the core, and connects the other two side portions of the upper piece and the lower piece;
The transformer characterized by comprising. 2. The transformer according to claim 1, wherein the lower piece has a configuration in which the outer shape of the inclined portion that connects the four side portions to the tip side and the base side of the plane is linear. vessel.   2. The transformer according to claim 1, wherein the lower piece has a configuration in which each of the four side surfaces has a trapezoidal shape in which a plane is a top portion at a front end side and a base portion is a bottom portion.   2. The transformer according to claim 1, wherein in the lower piece, the one two side surface portions are configured to have a height dimension larger than that of the other two side surface portions. In the lower piece, each of the other two side faces has a side length on the front end side of the plane shorter than a distance between the opposing faces of the coil support piece, and a side length on the base side is opposite to the coil support piece. It is longer than the inter-surface distance, and the inclined part connecting the tip side and the base side is in contact with the coil support piece, and the inclined part bites into the coil support piece. The transformer according to any one of claims 1 to 4. The said lower piece is a structure by which said one side surface part was respectively comprised by the side length of the base side of the plane shorter than the length of the said coil support piece . Transformer. 2. The transformer according to claim 1 , wherein the lower piece has a configuration in which an angle formed between the one two side surfaces and the bottom surface is in a range of 70 ° to 85 ° .

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