JP7215990B2 - three-dimensional core transformer - Google Patents

Description

The present invention relates to a three-dimensional core transformer.

In Patent Document 1, three single iron cores having the same structure and having a square shape are arranged in a substantially triangular shape when viewed from the vertical direction, and the upright sides of two adjacent single iron cores are bonded together and fixed integrally. A three-dimensional wound core transformer is disclosed (see Abstract) comprising legs on which high and low voltage coils are wound.

Japanese translation of PCT publication No. 2013-539215

According to the transformer described in Patent Document 1, the distortion of the magnetic flux waveform generated in each unit core becomes smaller, so that the iron loss is reduced more than the conventional three-phase three-leg transformer, and the transformer is improved. Efficiency can be improved. A transformer or transforming equipment having the core structure is called a three-dimensional core transformer. Conventionally, a three-dimensional core transformer has a shape of an assembly of a core and windings wound around the core, that is, a shape of the core when viewed from the vertical direction, which is generally triangular. The shape of the sealed container, that is, the tank, is also substantially triangular, which is similar to the shape of the contents when viewed from the vertical direction. Therefore, the external shape of the entire three-dimensional core transformer including the cooling radiator is also substantially triangular when viewed from the vertical direction.

As for the external shape of conventional transformers in Japan, for example, a three-phase three-legged transformer is rectangular when viewed from the vertical direction, and a single-phase transformer or a three-phase transformer in which two single-phase transformers are stacked. The transformer is generally circular.

Since the three-dimensional core transformer has not been distributed in Japan, consideration is not given to the replacement demand for conventional transformers in Japan. Therefore, for example, because it does not match the transformer installation floor shape that matches the conventional three-phase three-legged transformer, when installing the three-dimensional core transformer in place of the conventional power receiving and transforming equipment, the transformer installation floor area is large. However, there was a problem that the overall size of the power receiving and transforming equipment increased as the installation floor space increased. Here, if the shape of the tank is rectangular when viewed from the vertical direction like a conventional three-phase three-legged transformer, the gap between the inner wall of the tank and the contents becomes large, and the oil amount and mass increase, which is uneconomical. target. Therefore, it is desirable that the shape of the tank of the three-dimensional core transformer is substantially triangular when viewed from the vertical direction. This problem is the same when replacing a three-dimensional core transformer in a substantially circular transformer installation floor shape. Incidentally, in the transformer described in Patent Document 1, no consideration is given to installing the transformer in place of conventional power receiving and transforming equipment and to increasing the size of the power receiving and transforming equipment.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a three-dimensional core transformer with a preferable structure of a transformer tank and fins for heat dissipation, which meets the demand for replacement of conventional transformers in Japan.

To give an example of the "three-dimensional core transformer" of the present invention for solving the above problems,
Three rectangular frame-shaped unit cores are arranged in a substantially triangular shape when viewed from the vertical direction, and a three-dimensional core having three core legs each having two cores joined together, and a three-dimensional core provided in each of the core legs A three-dimensional core transformer comprising a three-dimensional core transformer body having three coils, a transformer tank containing the three-dimensional core transformer body, and a plurality of cooling fins provided on the outer surface of the transformer tank There is
The transformer tank has a substantially triangular tank shape when viewed from the vertical direction. A first imaginary line that is generally parallel to the reference plane is provided, and a second imaginary line that is generally perpendicular to the reference plane is provided on both sides of one side of the approximate triangle. so that the tips of the plurality of cooling fins provided on the remaining two sides of are along the virtual line closer to the transformer tank of the first virtual line and the second virtual line, It is characterized in that the heights of the plurality of cooling fins are changed according to the mounting position on the tank.

Also, if another example of the "three-dimensional core transformer" of the present invention is given,
Three rectangular frame-shaped unit cores are arranged in a substantially triangular shape when viewed from the vertical direction, and a three-dimensional core having three core legs each having two cores joined together, and a three-dimensional core provided in each of the core legs A three-dimensional core transformer comprising a three-dimensional core transformer body having three coils, a transformer tank containing the three-dimensional core transformer body, and a plurality of cooling fins provided on the outer surface of the transformer tank There is
The transformer tank has a substantially triangular tank shape when viewed from the vertical direction, and a substantially circular imaginary line is provided in contact with the substantially triangular tank shape of the transformer tank, and a plurality of The heights of the plurality of cooling fins are varied according to the mounting position on the tank so that the tips of the cooling fins are along the virtual circular line.

ADVANTAGE OF THE INVENTION According to this invention, the three-dimensional core transformer provided with the preferable structure of a transformer tank and a heat radiation fin can be provided in line with the replacement demand of the conventional transformer in Japan.

Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a perspective view of the contents of a three-dimensional core transformer according to the present invention; FIG. It is a top view of a three-dimensional core transformer of conventional structure. It is the external shape of the tank which shows the example of a substantially triangular shape in this invention. 1 is a top view of an example of a three-dimensional core transformer in Example 1. FIG. FIG. 11 is a top view of an example of a three-dimensional core transformer in Example 2; FIG. 11 is a top view of an example of a three-dimensional core transformer in Example 3; FIG. 11 is a top view of an example of a three-dimensional core transformer in Example 4;

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each drawing for describing the embodiments, the same components are given the same names and symbols, and the repeated description thereof is omitted.

In addition, the transformer equipment or transformer in this specification will be described as an oil-immersed transformer having insulating oil, which is a liquid for insulating and cooling the contents in the transformer tank, as a representative, but not limited to this, resin It may be a dry transformer with some varnish applied to the inside, or any other transformer equipment or transformer.

FIG. 1 shows a perspective view of an example of the contents of a three-dimensional core transformer in the present invention.
As shown in FIG. 1 , the three-dimensional core transformer core 1 is composed of a three-dimensional core 11 , coils 12 , upper mounting brackets 13 and lower mounting brackets 14 . Note that the three-dimensional core transformer content 1 is also simply referred to as the content.

The three-dimensional core 11 is composed of three rectangular frame-shaped unit cores having the same magnetic path length. The cross-sectional shape of the mated core legs is substantially circular. A cylindrical coil 12 is arranged on each of the three core legs. Since the cross-sectional shape of the core leg portion where the two cores are joined together is substantially circular, the coil is cylindrical. A lower mounting bracket 14 is attached to the lower side of the three-dimensional core 11, and an upper mounting bracket 13 is attached to the upper side. The coil 12 is vertically supported by a coil support 15 arranged between the lower mounting bracket 14 and the upper mounting bracket 13 . The upper mounting bracket 13 and the lower mounting bracket 14 are connected by a mounting bracket connecting stud 16 .

FIG. 2 shows a top view of a conventionally structured transformer in which the contents of a three-dimensional core transformer are housed in a transformer tank. In the figure, for example, the X direction is the width direction of the three-dimensional core transformer, and the Y direction is the depth direction of the three-dimensional core transformer. The transformer tank 2 has a substantially triangular shape when viewed from the vertical direction, and has a hexagonal shape obtained by cutting off three vertices of the triangle. A plurality of cooling fins 21 having the same height are provided outward from the outer surfaces of the three transformer tanks.

As shown in FIG. 2, in the conventional structure, in addition to the fact that the shape of the transformer tank 2 is a substantially triangular shape similar to the contents when viewed from the vertical direction, the shape of the cooling fins 21 is similar to that of the transformer tank. It is the same and has the same height regardless of the mounting position to 2. Therefore, when the three-dimensional core transformer is viewed from the vertical direction, the minimum area of a rectangle that can cover the entire three-dimensional core transformer, that is, the minimum required installation area 22 and the tip of the cooling fins 21 are connected to the imaginary The difference from the area 23 due to the outer shape is large. That is, there is a problem that the minimum required installation area 22 required for transformer installation becomes larger than the transformer installation area. Note that the transformer tank 2 is simply referred to as a tank, and the shape of the tank viewed from the vertical direction is simply referred to as the tank shape.

FIG. 3 shows the outer shape of the tank, which is an example of the substantially triangular shape. FIG. 3A shows an example consisting of three long sides 32 and three rounded portions 31 formed by rounding the vertices of a triangle. In the drawing, reference numeral 33 denotes an intersection point (vertex) extending the long side 32 , and reference numeral 34 denotes a provisional area shape formed as the vertex 33 . FIG. 3(b) is an example of a substantially hexagonal shape having three planar portions 35 obtained by cutting off the vertices 33 of the triangle shown in FIG. FIG. 3C shows an example having three convex portions 35 whose vertices are triangular convex portions. As shown in the example of FIG. 3 , a virtual area shape 34 formed with three intersections 33 extending three long sides 32 as vertices, including a shape (rounded portion 31) with rounded vertices of a triangle, is roughly triangular. Let the shape to be approximately triangular.

The present invention provides a three-dimensional core transformer in which the contents are stored in such a substantially triangular transformer tank, in which the area required for installing the transformer is smaller than that of a conventional three-dimensional core transformer. It is.

FIG. 4 shows a top view of an example of the three-dimensional core transformer of the first embodiment. FIG. 4 is a schematic diagram of the three-dimensional core transformer of Example 1 viewed from the vertical direction.

The contents of the three-dimensional core transformer shown in FIG. 1 are accommodated in a substantially triangular transformer tank 2 shown in FIG. 3(b), and the transformer tank is filled with insulating oil. In this embodiment, as shown in FIG. 4, one side 2a of the substantially triangular tank shape is used as a reference plane, and the line connecting the tip of the heat radiation fin 21 provided on the side 2a to the side 2a side, An imaginary line 40a is provided which is substantially parallel to the reference plane. An imaginary line 40b substantially parallel to the reference plane is provided on the vertex side facing one side 2a of the approximate triangle, and a plurality of cooling lines provided on the remaining two sides 2b and 2c of the approximate triangle of the tank shape. The heights of the cooling fins 21 are changed according to the mounting positions on the tank so that the tips of the cooling fins 21 are along the imaginary line 40b. Virtual lines 40c and 40d substantially perpendicular to the reference plane are provided on both sides of the transformer tank 2 in the width direction, that is, on both sides of one side of the substantially triangular shape of the tank. The heights of the plurality of cooling fins 21 are changed according to the mounting positions on the tank so that the tips of the cooling fins 21 provided on the remaining two sides 2b and 2c are along the virtual lines 40c and 40d. Therefore, the length of part of the plurality of heat radiation fins 21 provided on the outer surface of the transformer tank 2 can be increased. Assuming that the entire surface area of the heat radiation fins 21 is the same, the reference plane, which is one side of a substantially triangle, and the virtual line parallel to the reference plane in the conventional three-dimensional core transformer shown in FIG. , the minimum required footprint 40 of the three-dimensional core transformer can be reduced compared to the minimum required footprint 22 of a conventional three-dimensional core transformer. A rectangular minimum required installation area 40 of the three-dimensional core transformer is formed by virtual lines 40a, 40b, 40c, and 40d. Further, in this embodiment, a plurality of cooling fins 21 having the same height are provided on one side of the substantially triangular shape which is used as the reference plane.

According to this embodiment, one side of a substantially triangular shape of a tank is used as a reference plane, and a virtual line that is substantially parallel to the reference plane is provided on the vertex side facing one side of the substantially triangular shape. The tips of the cooling fins provided on the remaining two sides of the triangle are aligned with the imaginary line. The minimum required footprint of the transformer can be reduced compared to the minimum required footprint of a conventional three-dimensional core transformer.

According to this embodiment, the length in the depth direction can be shortened, and a three-dimensional core transformer that can replace, for example, a conventional three-phase three-legged transformer can be provided.

FIG. 5 shows a top view of an example of the three-dimensional core transformer of the second embodiment. FIG. 5 is a schematic diagram of the three-dimensional core transformer of Example 2 as seen from the vertical direction.

Example 2 is the three-dimensional core transformer of Example 1, in which the shape and mounting position of the cooling fins are changed.

The contents of the three-dimensional core transformer shown in FIG. 1 are accommodated in the transformer tank 2 shown in FIG. 3(b). As shown in FIG. 5, the transformer tank 2 is arranged such that one side 2a of the substantially triangular shape of the tank is used as a reference plane, and the reference plane is along one side 40a of the minimum required installation area 40 of the three-dimensional core transformer. . An imaginary line 40b substantially parallel to the reference plane is provided on the vertex side facing one side 2a of the approximate triangle, and cooling fins are provided on the remaining two sides 2b and 2c of the approximate triangle of the tank shape. The heights of the plurality of cooling fins 21 are changed according to the mounting positions on the tank so that the tips of the cooling fins 21 are along the virtual line 40b. Imaginary lines 40c and 40d substantially perpendicular to the reference plane are provided on both sides of the transformer tank 2 in the width direction. The heights of the plurality of cooling fins 21 are changed according to the mounting positions on the tank so that the tips of the cooling fins 21 are along the virtual lines 40c and 40d. In this embodiment, the heat radiation fins 21 are not provided on one side 2a of the substantially triangular shape.

As shown in FIG. 5, in the present invention, although there are restrictions due to the outer dimensions of the tank itself, the shape and mounting location of the cooling fins can be freely changed.

Also in this embodiment, one side of the substantially triangular shape of the tank is used as a reference plane, and an imaginary line substantially parallel to the reference plane is provided on the vertex side facing one side of the substantially triangular shape. The height of the plurality of cooling fins was changed according to the mounting position on the tank so that the tips of the cooling fins provided on the remaining two sides 2b and 2c of the two sides 2b and 2c were along the virtual line. The minimum required installation area of the three-dimensional core transformer can be reduced compared to the minimum required installation area of conventional three-dimensional core transformers.

Also in this embodiment, the length in the depth direction can be shortened, and for example, a three-dimensional core transformer that can replace a conventional three-phase three-legged transformer can be provided.

Up to this point, we have examined examples that meet the demand for replacing existing three-phase, three-legged transformers.

FIG. 6 shows a top view of an example of the three-dimensional core transformer of the third embodiment. FIG. 6 is a schematic diagram of the three-dimensional core transformer of Example 3 as seen from the vertical direction. Example 3 is a case where the shape of the transformer installation area is circular.

The contents of the three-dimensional core transformer shown in FIG. 1 are accommodated in the transformer tank shown in FIG. 3(b). As shown in FIG. 6, a substantially circular imaginary line 41 is provided to surround a substantially triangular shape of the tank, and the tips of a plurality of cooling fins 21 provided on the outer surface of the transformer tank are aligned along the substantially circular imaginary line 41. As shown, the height of the plurality of cooling fins 21 is changed according to the mounting position on the tank. In the drawing, the substantially circular imaginary line 41 is a circle that touches the substantially triangular shape of the transformer tank 2 , but may be a circle that is not in contact with the substantially triangular shape of the transformer tank 2 and is larger than the substantially triangular shape.

In the drawing, one side 2a of the substantially triangular shape of the transformer tank 2 is not provided with cooling fins, but cooling fins 21 may be provided on all three sides of the substantially triangular shape of the transformer tank 2. FIG. In this case, the shape 41 of the transformer installation area becomes a perfect circle. The plane formed by one side 2a on which no cooling fins are provided may be used as a place for mounting a transformer, or may be used for mounting accessories such as terminals.

According to this embodiment, a substantially circular imaginary line is provided to surround the tank-shaped substantially triangular shape, and the tips of the plurality of cooling fins provided on the outer surface of the transformer tank are aligned along the substantially circular imaginary line. Since the height of the plurality of cooling fins is changed according to the mounting position on the tank, the area required for installing the transformer can be made smaller than that of a three-dimensional core transformer with a conventional structure.

According to this embodiment, the overall shape of the transformer can be reduced, and a three-dimensional core transformer can be provided that can replace conventional transformers in a substantially circular transformer installation floor shape. .

As Example 4, FIG. 7 shows a schematic diagram of a three-dimensional core transformer having a circular tank shape like a conventional pole-mounted transformer. A tank having a circular tank shape is also simply referred to as a round tank.

As shown in the figure, a round tank 50 with heat radiation fins 21 radially attached to the outer surface accommodates a three-dimensional core transformer content 1 comprising a three-dimensional core 11 and coils 12, and the tank 50 is filled with insulating oil.

Since the conventional three-dimensional core transformer has a substantially triangular tank shape, the convection of the insulating oil is blocked at the corners of the tank, which is a factor in the deterioration of the cooling efficiency. In addition, since the cooling fins provided on the tank are arranged linearly, the radiant heat of the cooling fins interferes with each other, which causes deterioration of the cooling efficiency.

In this embodiment, since the tank is a round tank, the convection of the insulating oil inside is not hindered, and the cooling performance of the contents is superior to that of the conventional structure. In addition, since the cooling fins are not straight but radially attached, the interference of radiant heat between the cooling fins is alleviated, and the cooling performance is superior to that of the conventional structure.

In addition, the transformer must have a structure capable of withstanding fluctuations in internal pressure caused by fluctuations in the oil level caused by fluctuations in ambient temperature and load, and rapid internal pressure increases at the time of an internal short circuit. In general, the strength against internal pressure increases as the shape of the tank approaches a circular shape, so this embodiment improves the structural strength of the tank compared to conventional three-dimensional core transformers. In addition, the improvement in strength eliminates the need for pressure relief devices and reinforcing members that were conventionally provided in tanks and cooling fins, so productivity and quality stability are expected to be improved by reducing the number of parts.

According to this embodiment, it is possible to provide a three-dimensional core transformer that can replace conventional transformers with round tanks.

1 Three-dimensional core transformer contents 11 Three-dimensional core 12 Coil 13 Upper mounting bracket 14 Lower mounting bracket 15 Coil support 16 Mounting bracket connection stud 2 Transformer tank 21 Cooling fin 22 Area required for conventional transformer installation 23 Transformer installation area 31 Rounded portion of triangular vertex 32 Long side of approximate triangle 33 Intersection point (vertex) of extended long side
34 Virtual area shape formed with the intersection point as the vertex 35 Plane portion 36 obtained by cutting off the vertex of a substantially triangular shape Convex portion 40 formed on the vertex of a substantially triangular shape Area required for installation of transformers of Examples 1 and 2 41 Example 3 Area required for installing a transformer of 50 round tank

Claims (10)

Three rectangular frame-shaped unit cores are arranged in a substantially triangular shape when viewed from the vertical direction, and a three-dimensional core having three core legs each having two cores joined together, and a three-dimensional core provided in each of the core legs A three-dimensional core transformer comprising a three-dimensional core transformer body having three coils, a transformer tank containing the three-dimensional core transformer body, and a plurality of cooling fins provided on the outer surface of the transformer tank There is
The transformer tank has a substantially triangular tank shape when viewed from the vertical direction,
One side of a substantially triangular tank shape is used as a reference plane, and a first imaginary line substantially parallel to the reference plane is provided on the side of the vertex opposite to one side of the substantially triangular shape; A second imaginary line that is generally perpendicular to the reference plane is provided on both sides of one side of the
The tips of the plurality of cooling fins provided on the remaining two sides of the substantially triangular shape of the tank are positioned closer to the transformer tank than the first virtual line and the second virtual line. A three-dimensional core transformer, wherein the heights of the plurality of cooling fins are varied according to the mounting position on the tank along a virtual line . In the three-dimensional core transformer according to claim 1 ,
Formed by one side of the approximate triangle, a first imaginary line generally parallel to the reference plane, and a second imaginary line generally perpendicular to the reference plane on both sides of one side of the approximate triangle. A three-dimensional core transformer, characterized in that the shape of the three-dimensional core transformer is rectangular. In the three-dimensional core transformer according to claim 1,
A three-dimensional core transformer, wherein the substantially triangular transformer tank has a hexagonal shape obtained by truncating three tops of the substantially triangular shape. In the three-dimensional core transformer according to claim 1,
A three-dimensional core transformer, wherein the transformer tank has three truncated rounded portions, flat portions, or convex portions of a substantially triangular shape. In the three-dimensional core transformer according to claim 1,
A three-dimensional core transformer, wherein a plurality of cooling fins having the same height are provided on one side of the substantially triangular shape serving as a reference plane. In the three-dimensional core transformer according to claim 1,
A three-dimensional core transformer, wherein no cooling fin is provided on one side of the substantially triangular shape serving as a reference plane. Three rectangular frame-shaped unit cores are arranged in a substantially triangular shape when viewed from the vertical direction, and a three-dimensional core having three core legs each having two cores joined together, and a three-dimensional core provided in each of the core legs A three-dimensional core transformer comprising a three-dimensional core transformer body having three coils, a transformer tank containing the three-dimensional core transformer body, and a plurality of cooling fins provided on the outer surface of the transformer tank There is
The transformer tank has a substantially triangular tank shape when viewed from the vertical direction,
A substantially circular imaginary line is provided in contact with the substantially triangular tank shape of the transformer tank, and the tip of a plurality of cooling fins provided on the outer surface of the transformer tank is aligned with the substantially circular imaginary line. A three-dimensional core transformer, wherein the heights of the plurality of cooling fins are varied according to their mounting positions on the three-dimensional core transformer. In the three-dimensional core transformer according to claim 7 ,
A three-dimensional core transformer, wherein no cooling fin is provided on one side of the substantially triangular shape. In the three-dimensional core transformer according to claim 7 ,
A three-dimensional core transformer, wherein the substantially triangular transformer tank has a hexagonal shape obtained by truncating three tops of the substantially triangular shape. In the three-dimensional core transformer according to claim 7 ,
A three-dimensional core transformer, wherein the transformer tank has three truncated rounded portions, flat portions, or convex portions of a substantially triangular shape.

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