TW201629999A - Transformer - Google Patents

Abstract

A transformer using a wound iron core is provided with, at least: a tubular coil formed by winding an electric wire so as to cause a large-sized wound iron core to stand upright in order to prevent the wound iron core from buckling or falling, and so as to suppress internal stresses in the wound iron core in order to prevent an increase in iron loss and noise; a wound iron core formed in ring shape by layering magnetic material, and incorporated into a hollow portion of the coil; and a frame supporting the coil and the wound iron core, wherein the wound iron core comprises multiple blocks that are concentric and divided into at least inner and outer blocks, and the insides of the upper sides of the inner and outer blocks of the wound iron core are supported in such a way as to be oriented vertically upwards by a plurality of plate-like members coupled to the frame.

Description

transformer

The present invention relates to a transformer using a wound core.

The global warming of the world is becoming more serious, and a technology for reducing the emission of carbon dioxide (CO ₂ ) to effectively use energy is urgently sought. Here, the amorphous foil has a higher magnetic permeability (10000~>1000~: 矽 steel plate) and lower iron loss than the 矽 steel plate (W10/50=0.1W<1W: 矽 steel plate). The transformer using the amorphous foil for the wound core can greatly reduce the standby power compared to the transformer using the tantalum steel sheet for the wound core. For example, if the three-phase three-column and 66kV/25MVA transformer are used for estimation, the standby power of 74 kW can be reduced by changing the material of the core from the 矽 steel plate to the amorphous foil.

Fig. 1 is a view showing a three-phase five-column transformer 3 using a wound core. Three cylindrical coils 1 molded of a resin are arranged, and a rolled core 2 using a tantalum steel sheet or an amorphous foil is placed in a hollow portion thereof.

FIG. 2 is a view showing a state in which the wound core 2 is assembled to the coil 1. A part of the wound core 2 which is a ring-shaped steel sheet or an amorphous foil is opened, and the straight portion is inserted into the inside of the coil 1 so as to enter the inside of the coil 1. Thereafter, the opening portion of the winding core protruding from the lower end of the coil 1 is closed, thereby assembling the transformer 3 of Fig. 1. In the current situation, a tantalum steel sheet having a thickness of about 0.23 mm is widely used in a rolled core, but the efficiency of the transformer can be greatly improved by changing it to an amorphous foil having a thickness of about 25 μm.

Previously, for transformers with high voltage and large capacitance (for example, about 66 kV, 25 MVA), a laminated core of a bismuth steel plate was used, but according to the above background, there is an amorphous roll to be used. The requirements of the iron core. However, since the thickness of the amorphous foil is thin and is a fragile material, if the core 2 is increased in size, as shown in FIG. 3, buckling occurs due to its own weight and it is impossible to stand up.

Further, in the transformer 3 shown in Fig. 1, the coil 1 is resin-molded into a block shape, and the coil 1 receives a part of the weight of the wound core 2 via the spacer 5. However, if the transformer is increased in size, resin molding of the coil cannot be performed, and the coil 1 may be damaged due to the weight of the wound core 2.

Therefore, the highest level of domestically produced amorphous transformers is three-phase three-column, 6.6kV/2MVA, and the total mass of the wound core used is about 2t.

Therefore, in order to maintain the performance of the transformer in which the core is large, it is necessary to reduce the stress applied to the core due to its own weight. Fig. 4 is a graph showing measured values of iron loss versus magnetic flux density when pressure is applied to a portion of the amorphous rolled core. The pressing portion of the winding core shown in the right side of the figure (the size of the pressing portion is 7.6 kg in the size shown) is applied from the direction of the arrow. As shown in the graph on the left side of the figure, as the pressure increases, the iron loss becomes large.

Further, it is known from Non-Patent Document 1 that noise is also increased when stress is applied to the iron core. Therefore, in order to suppress an increase in iron loss and noise, it is necessary to have a support structure in which the stress inside the wound core is reduced.

Here, a known example in which a support member is provided around the amorphous coil core is disclosed in Patent Document 1 (Japanese Patent Laid-Open Publication No. 2013-8808). In the known example, the following structure is disclosed: in order to reduce the load applied to the coil to prevent damage, the upper side of the upper side of the core is supported vertically by being mounted on the cross member of the column-shaped support member; The effect of reducing the internal stress of the core is not described.

Therefore, in Fig. 5, the result of analyzing the internal stress depending on the presence or absence of the support of the inner side of the upper side of the wound core is shown. As shown in the analysis result (simulation result), the inner side of the upper side of the winding cores 6 and 7 is supported by the total of (2), and the stress generated by the self-weight can be dispersed up and down, and when the (1) is erected without support. The internal stress can be reduced compared to the internal stress.

However, in order to further advance the performance improvement of the transformer, it is necessary to support not only the supporting member on the inner side of the upper side of the above-mentioned rolled core but also the structure of the internal stress of the wound core.

Further, although the background art has been described by taking a high-efficiency transformer using an amorphous coil core as an example, even if it is a rolled core of a tantalum steel sheet, it is difficult to stand up when it is enlarged, and it is necessary to suppress an increase in iron loss. Support structure.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2013-8808

[Non-patent literature]

Non-Patent Document 1: Yingying WANG, Other 4 coauthors, Experimental Study of Testing Models for Low Noise Amorphous Alloy Core Power Transformers, 2010 International Conference on Electrical and Control Engineering, pp3725 - 3728 (2010)

The problem to be solved by the present invention is that in a transformer using a wound core, the core of the coil is raised to prevent buckling or falling of the large coil core, and the internal stress of the coil core is suppressed to be low to prevent iron loss and The increase in noise.

The most important feature of the transformer of the present invention is that it comprises at least: a cylindrical coil which is formed by winding a wire; and a rolled core which is formed by laminating a magnetic material into a ring shape and incorporated into a hollow portion of the coil; Supporting a coil and a coil core; forming a coil core from a plurality of blocks concentrically divided into at least an inner side and an outer side, and supporting the inner block vertically by a plurality of plate-like members connected to the frame The inner side of the upper side of each of the cores of the body and the outer block.

According to the present invention, the winding core is supported by dividing into a plurality of concentric blocks, whereby the internal stress of the upper support portion can be reduced. Moreover, by adjusting the position of the upper and lower core support faces, the internal stress of the wound core can be further reduced. Thereby, it is possible to achieve high efficiency (reduction in iron loss) and low noise in the transformer in which a large-sized coil core is incorporated.

1‧‧‧ coil

2‧‧‧Volume core

3‧‧‧Transformers

4‧‧‧Base

5‧‧‧ spacers

6‧‧‧Inside wound core

7‧‧‧Outer rolled core

8‧‧‧Concentric Hearts

9‧‧‧Support board

10‧‧‧Frame

11‧‧‧ Guides

12‧‧‧First Support Board

13‧‧‧second support board

14‧‧‧ rod members

15‧‧‧ Spacer (for height position adjustment)

16‧‧‧The pillar of Framework 10

h‧‧‧The amount of deformation of the upper part of the core due to its own weight

Hi‧‧‧The amount of deformation of the upper part of the inner core of the inner core due to its own weight

ho‧‧‧The amount of deformation of the upper part of the outer core of the outer core due to its own weight

L‧‧‧Supports the distance between the support surface of the upper side of the upper core and the position of the support surface supporting the outer side of the lower side

Lc‧‧‧Distance between the upper inner side of the core and the outer side of the lower side

Li‧‧‧Supports the distance between the support surface position on the inner side of the upper side of the inner core and the support surface position on the outer side of the lower side of the outer core

Lic‧‧‧The distance between the inner side of the upper side of the inner core and the outer side of the lower side of the outer core

Lo‧‧‧Supports the distance between the support surface of the upper side of the outer core and the position of the support surface supporting the outer side of the lower side

Loc‧‧‧The distance between the inner side of the upper side of the outer core and the outer side of the lower side

Rc‧‧‧The size of the inner side of the core of the core

Rp‧‧‧ is larger than the size of the inner side of the coil core R

Figure 1 is a diagram showing a transformer of a previous three-phase five-column using a wound core.

Fig. 2 is a view showing the assembly steps of the winding core of the prior three-phase five-column transformer.

Fig. 3 is a view showing a state in which the wound core is bent.

Fig. 4 is a graph showing the measured results of iron loss when pressure is applied to the wound core.

Fig. 5 (1) and (2) show the results of analyzing the internal stress depending on the presence or absence of the support of the inner side of the upper side of the wound core.

FIGS. 6(1) and (2) are diagrams showing the results of analyzing the internal stress when the upper portion of the support core is divided for each block.

Fig. 7 is a view showing the positional relationship of the upper and lower support faces of the wound core.

8(1) to (4) are diagrams showing the results of analyzing the internal stress for each size setting of the upper and lower support faces of the wound core.

Fig. 9 is a view showing the inner winding core and the outer winding core.

Fig. 10 is a view showing a state in which two inner winding cores, three outer winding cores, and coils are combined.

Fig. 11 is a cross-sectional view showing a state in which two inner winding cores, three outer winding cores, and coils are combined.

Figure 12 is a perspective view of the single-phase three-column transformer of the first embodiment.

Figure 13 is a three-sided view of the single-phase three-column transformer of the first embodiment.

Fig. 14 is a view showing the inner winding core and the outer winding core of the first embodiment.

Fig. 15 is a view showing a frame used in the transformer of the first embodiment.

Figure 16 shows the shape of the inner winding core of the transformer of the embodiment 1 in which only the frame of the embodiment 1 is mounted. state.

Figure 17 is a perspective view of the single-phase three-column transformer of the second embodiment.

Fig. 18 is a perspective view showing a state in which the outer side of the transformer of the second embodiment is removed.

Fig. 19 is a view for explaining the positional relationship between the upper and lower support faces of the winding core when the inner and outer winding cores are supported by the first and second support plates, respectively.

Fig. 20 is a view for explaining the positional relationship between the upper and lower support faces of the wound core when one portion of the support plate supports the two cores of the inner and outer rolled cores.

Figure 21 is a perspective view of a single-phase three-column transformer of Embodiment 3.

Figure 22 is a three-side view of the single-phase three-column transformer of the third embodiment.

Fig. 23 is a view showing a frame used in the transformer of the third embodiment.

Figure 24 is a three-side view of the single-phase three-column transformer of the fourth embodiment.

Fig. 25 is a view showing the structure of a first support plate and a second support plate used in the transformer of the fifth embodiment.

26(1) and (2) are diagrams showing the results of analyzing the stress reduction effect of the support plate structure of the transformer of the fifth embodiment.

First, the basic concept of the embodiment of the present invention will be described.

Fig. 6 is a view showing the internal stress of the inner core 6 and the outer core 7 of the two amorphous coil cores which are concentric, and the inner side of the upper side is supported by (1), and the inner side of (2) is divided. A graph showing the result of the internal stress (simulation result) under the two conditions of the case where the rolled core 6 and the outer rolled core 7 are respectively divided and supported on the inner side of the upper side.

Even if the inner side of the upper side of the wound core is supported in a general manner as in (1), the stress can be dispersed above and below the wound core. Therefore, when the inner side of the concentric inner core 6 and the outer side of the outer core 7 are respectively supported as divided as in (2), the internal stress of the upper portion of the core can be further reduced.

Based on the result, the present invention adopts the following configuration as an embodiment: dividing the core of the coil The plurality of blocks are concentrically cut, and a plurality of plate-like members connected to the frame support the inner side of the upper side of the winding core of each block vertically upward.

In the following description of the embodiments, a plurality of blocks of concentric shape indicate two stages of the inner winding core and the outer winding core. However, the size of the transformer or the like may be three or more. . Further, in the following embodiments, the depth direction of the winding core is also set to be three outer blocks and two inner blocks, but it is of course not limited to the number, and may be a combination other than the above.

On the other hand, Fig. 7 is a view for explaining the positional relationship of the upper and lower support faces of the wound core. As shown in Fig. 7, in the state in which the self-weight is not applied (the state in which the core is laid flat) (the figure in the center), the distance between the inner side of the upper side of the rolled core 2 and the outer side of the lower side is set as Lc. Further, when the core 2 is raised without support (right), the amount of deformation of the upper portion of the core 2 due to its own weight is h. For the support surface, the distance between the support surface position supporting the inner side of the upper core 2 (the upper surface position of the support plate 9 in Fig. 7) and the support surface position supporting the outer side of the lower side is set to L (left).

Further, Fig. 8 shows that the distance L shown in Fig. 7 (the distance between the support surface position on the inner side of the upper side of the support core and the support surface position on the outer side of the support lower side) is set to be smaller than Lc (the upper side of the upper side of the wound core) A graph showing the result (simulation result) of analyzing the internal stress applied to the wound core by the value of the distance between the position and the position of the lower outer side. In FIG. 8, (1) shows the case of L=Lc, and (2)-(4) shows the analysis result of the three cases of L<Lc. It can be understood that if L is slightly smaller than Lc, the internal stress of the wound core can be reduced. In this case, by setting L = Lc - h / 4 as shown in (2), the internal stress becomes minimum. However, the amount h of deformation of the upper portion of the wound core due to its own weight is extremely small compared to Lc, so even if L < Lc is satisfied, L becomes a distance slightly smaller than Lc.

According to still another aspect of the present invention, the transformer has a mechanism for adjusting the distance L (the distance between the support surface position supporting the inner side of the upper side of the wound core and the support surface position supporting the outer side of the lower side). The distance L is set smaller than the above distance Lc (supports the distance between the support surface position on the inner side of the upper side of the wound core and the support surface position on the outer side of the lower support side) (L < Lc).

Next, a single-phase three-column transformer will be taken as an example, and Embodiments 1 to 5 of the present invention will be sequentially described using Figs. 9 to 25 . In the description of each embodiment, a winding core and a coil constituting a single-phase three-column transformer will be described.

Fig. 9 is a view showing the inner winding core 6 and the outer winding core 7 for the transformer. Each of the wound cores is formed by laminating an amorphous foil or a tantalum steel sheet and winding it into a mold, and applying annealing for straightening.

Fig. 10 is a view showing a state in which two inner winding cores, three outer winding cores, and coils are combined. As shown in FIG. 10, two inner winding cores 6 and three outer winding cores 7 are combined to form a concentric core group 8. In the single-phase three-column transformer, two winding core groups 8 are arranged, and a central portion in which the straight portions of the right and left winding core groups are combined is inserted into the coil 1.

Figure 11 is a cross-sectional view showing the face A of Figure 10 . By combining the two winding core groups 8 (10 cores) arranged side by side, the cross section (hatched portion in the drawing) of the wound core in the coil 1 is made close to a circular shape.

[Example 1]

Figure 12 is a perspective view of a transformer of Embodiment 1 of the present invention. Figure 13 is a three-sided view of the transformer. Further, Fig. 14 is a view showing the inner winding core 6 and the outer winding core 7 of the transformer. In the case of the embodiment 1, the size of each of the wound cores is determined in advance so as to form a gap between the inner cores 6 and the outer cores 7 as shown in FIG.

Next, the structure of the transformer of the first embodiment will be described with reference to Figs. 12 and 13 .

The first support plate 12 is disposed on the inner side of the upper side of the two inner cores, and the second support plate 13 is disposed on the inner side of the upper side of the three outer cores. The inner coil core 6 is supported by the first support plate 12 vertically upward, and the outer coil core is supported by the second support plate 13 vertically upward. 7. Further, by the frame 10 connected to the first support plate 12 and the second support plate 13, one roll core group 8 (core 5 pieces) is supported vertically upward.

Figure 15 is a perspective view of the frame 10 with the core group and the coil removed. Guide members 11 for determining the positions of the inner coil core 6 and the outer coil core 7 are provided on the upper portions of the first support plate 12 and the second support plate 13 (however, after the first support plate 12 in FIG. 15 The two guides 2 of the square are hidden and cannot be observed).

Fig. 16 is a view showing a state in which only the inner winding core 6 is assembled to the frame 10. As shown in the figure, the upper side of the inner coil core 6 is placed and mounted on the first support plate 12 attached to the frame 10. Thereafter, from this state, as shown in Fig. 15, after the rod-shaped member 14 supporting the second support plate 13 is mounted on the first support plate 12, the second support plate 13 is mounted thereon. Then, the upper side of the outer winding core 7 is finally placed and mounted on the second support plate 13. Thereby, the structure shown in FIG. 12 is finally obtained.

As described above, in the first embodiment, the first and second support plates are used to discretely support the self-weight of the wound core, thereby reducing the internal stress of the wound core. As a result, the transformer using a large coil core can achieve high efficiency (reduction in iron loss) and low noise.

[Embodiment 2]

Figure 17 is a perspective view of a transformer of Embodiment 2 of the present invention. In addition, FIG. 18 is a perspective view showing a state in which the outer core of the transformer of the second embodiment is removed, and the second support plate 13 is attached to the upper side of the inner core 6. Basically, the second embodiment has substantially the same configuration as that of the first embodiment. The difference is that the rod-shaped member 14 mounted on the first support plate 12 and supporting the second support plate 13 is one in front and the rear in the first embodiment ( FIG. 12 ), but in the second embodiment ( In Fig. 17 and Fig. 18), two front and rear sides are provided. Further, the rod-shaped member 14 may be fixed to two at the front and the rear, and may be two or more according to the width (upper side length) of the outer rolled core.

Thereby, in the second embodiment, two or more rod-shaped members 14 can be used, and the second support plate 13 can be fixed in parallel and firmly with respect to the installation surface of the transformer, thereby preventing the winding core from being wound. Local stress is applied.

Here, the positional relationship between the upper and lower support faces of the winding core has been described in the above-mentioned FIG. 7, and then the inner core and the outer side are divided into the inner and outer cores 6 and the outer core 7 by the support plate. The positional relationship between the upper and lower support faces of the wound core at the time of supporting each case (that is, in the first embodiment and the second embodiment) will be described.

FIG. 19 is a view for explaining a positional relationship between the upper and lower support faces when the inner core 6 and the outer core 7 are respectively supported by the first support plate 12 and the second support plate 13 respectively. As shown in Fig. 19, in the state in which the self-weight is not applied (the state in which the core is laid flat) (the figure in the center), the inner side of the inner winding core 6 is positioned on the outer side of the lower side of the outer winding core 7 The distance between the positions is set to Lic, and the distance between the inner side of the upper side of the outer core 7 and the outer side of the lower side is set to Loc. When the inner winding core 6 and the outer winding core 7 are erected without support (right), the amount of deformation of the upper portion of the inner winding core 6 due to its own weight is hi, and the outer winding core 7 is upper. The amount of deformation due to its own weight is set to ho. For the support surface, the distance between the support surface position (the upper surface position of the first support plate 12) supporting the inner side of the inner core 6 and the support surface position of the outer side of the lower side of the outer core 7 is set to Li, The distance between the support surface position supporting the inner side of the upper side of the outer core 7 (the upper surface position of the second support plate 13) and the position of the support surface supporting the outer side of the lower side is referred to as Lo (left).

In the case of the positional relationship as described above, as described above with reference to FIGS. 7 and 8, Li is slightly smaller than Lic (Li<Lic) for the inner wound core 6, and also for Lo for the outer rolled core 7. Slightly smaller than Loc (Lo<Loc). Further, when the respective installation positions of the first support plate 12 and the second support plate 13 are adjusted based on Li and Lo, the internal stress of each of the inner roll core and the outer roll core can be reduced.

That is, in the first embodiment and the second embodiment, the internal stress can be further reduced, and the iron loss and the noise can be suppressed.

[Example 3]

Fig. 20 is a view for explaining the positional relationship between the upper and lower support faces of the wound core when the support plate 9 supports the two cores of the inner core 6 and the outer core 7 in one portion. As shown in Fig. 20, in the state in which the self-weight is not applied (the state in which the core is laid flat) (the center map), the inner side of the inner winding core 6 and the outer side of the outer winding core 7 are outside. The distance between the positions is set to Lic. Further, when the inner winding core 6 and the outer winding core 7 are erected without support (right drawing), the amount of deformation of the upper portion of the inner winding core 6 due to the weight of the two rolled cores is hi. With respect to the support surface, the distance between the support surface position (the upper surface position of the support plate 9) supporting the inner side of the inner core 6 and the support surface position of the outer side of the lower side of the outer core 7 is set to Li (left) ).

Figure 21 is a perspective view of a transformer of Embodiment 3 of the present invention. Figure 22 is a three-sided view of the transformer. As shown in Fig. 21, in the third embodiment, the support plate 9 is disposed inside the upper side of the inner core 6 in one roll core group 8 (the core 5), and is divided into the inner side and the outer side by one portion. Roll iron heart. Further, by the frame 10 connected to the support plate 9, one roll core group 8 (core 5 pieces) is supported in a vertically upward direction.

Figure 23 is a perspective view of the frame 10 from which the core group and the coil are removed. On the upper portion of the support plate 9, a guide 11 for determining the position of the inner winding core is provided. When the roll core group is mounted on the frame 10, the inner side of the inner roll core block is placed on the inner side of the support plate 9 along the guide, and then the assembled inner core piece is assembled. Assembled in the form of a block of the outer rolled core.

Here, in FIGS. 21, 22, and 23, with respect to the distance Li and the distance Lic defined in FIG. 20, the distance Li of the support surface position is slightly smaller than the distance Lic (Li < Lic) of the winding core.

Thereby, in the third embodiment, the internal stress of the wound core can be reduced as compared with the state of Li=Lic, thereby suppressing iron loss and noise.

[Example 4]

Figure 24 is a three side view of a transformer of Embodiment 4 of the present invention. Embodiment 4 can be combined with the above The transformers of Embodiments 1 to 3 are commonly used. Fig. 24 shows an example of a transformer applied to the first embodiment.

As shown, the spacer 15 can be inserted at least between any of the upper surface of the frame 10 and the lower surface of the first support plate 12 and between the upper surface of the rod member 14 and the lower surface of the second support plate 13, and The positions of the first and second support plates 12 and 13 on the inner side of the upper side of the support core are changed in the height direction.

Further, a spacer 15 may be inserted between the upper surface of the base 4 and the outer surface of the lower side of the outer winding core 7, and the position of the outer side surface of the lower winding core 7 in contact with the spacer 15 in the height direction may be changed.

Further, in order to change the position in the height direction, the position of contact with the support plates 12 and 13 can be adjusted by cutting the thread of the rod member 14 and the pillar 16 of the frame 10 and locking it with the nut. (= position of the support plates 12 and 13 in the height direction).

According to the configuration of the fourth embodiment, as in the third embodiment, the distance L of the support surface position is set to be slightly smaller than the distance Lc of the winding core, so that the winding core can be reduced as compared with the state of L = Lc. Internal stress.

[Example 5]

Embodiment 5 is designed for the support plate structure of the wound core. Fig. 25 is a view showing the structure of the first support plate 12 for the inner winding core and the second support plate 13 for the outer winding core.

In the above-described first to fourth embodiments, the support plate 9 (the third embodiment, not shown in FIG. 25) supporting the inner surface of the wound core, and the support plates 12 and 13 (the embodiment 1 or 2, in FIG. 25) In the case of the first embodiment shown in FIG. 1 ), the portion in contact with the inner corner portion of the wound core (the oblique portion of the support plates 12 and 13 shown in FIG. 25 ) is larger than the size Rc of the inner side R of the wound core (in FIG. 7 ). R of the figure) processes Rp (Rp > Rc).

Fig. 26 is a view showing the result (simulation result) obtained by analyzing the stress reduction effect of the support plate structure of the fifth embodiment. It can be seen that in the case of Rp>Rc of (2), the stress is reduced as compared with the case of Rp=Rc of (1).

Thereby, in the fifth embodiment, it is possible to prevent stress from being concentrated on the corner portion of the upper portion of the wound core, thereby preventing an increase in iron loss and noise.

As described above, in the present invention, the large and large-sized wound core can be raised without breaking the coil constituting the transformer, and the internal stress of the wound core can be suppressed to be low. Thereby, iron loss and noise can be suppressed, and a transformer with high efficiency and low noise can be realized.

Further, as described above, the transformer using the amorphous coil core has been described as an embodiment of the present invention, but it is of course possible to apply the present invention to a transformer using a coil core of a tantalum steel sheet.

Moreover, in the description of the embodiment of the present invention, a single-phase three-column transformer is exemplified, but the three-phase obtained by increasing the number of coils from 1 to 3 and increasing the number of coil core groups from 2 to 4 The five-column transformer, in turn, can also adopt the same configuration for a three-phase three-column transformer obtained by increasing the number of coils from 1 to 3 and increasing the number of coil core groups from 2 to 3.

1‧‧‧ coil

4‧‧‧Base

6‧‧‧Inside wound core

7‧‧‧Outer rolled core

8‧‧‧Concentric Hearts

10‧‧‧Frame

12‧‧‧First Support Board

13‧‧‧second support board

14‧‧‧ rod members

Claims (15)

A transformer comprising at least: a cylindrical coil formed by winding an electric wire; and a rolled core formed by laminating a magnetic material into a ring shape and incorporated into a hollow portion of the coil; and a frame Supporting the coil and the winding core; and having a core supporting member penetrating the inner side of the winding core and disposed on a vertically upper side of the frame, the winding core is divided into concentric inner and outer blocks, and the core supporting member includes Supporting the inner block support portion on the inner side of the upper side of the inner block vertically upward, supporting the outer block support portion on the upper side of the outer block and the inner block support portion in the vertical upward direction A support member that supports the outer block support portion on the upper side of the vertical. The transformer of claim 1, wherein a distance between the inner block supporting surface of the inner block support portion and the outer side of the lower block side of the outer block support portion is smaller than the vertical direction of the inner block body. The distance between the inner side of the upper side of the inner block and the outer side of the lower side of the outer block in the unattached state. The transformer of claim 1, wherein a distance between the outer block supporting portion of the outer block supporting portion and the outer side of the outer block is smaller than a distance of the outer block on the outer side of the outer block. The distance between the inner side of the upper side of the outer block and the outer side of the lower side of the outer block in the unattached state. The transformer of claim 1, wherein the inner block support portion of the inner block support portion supports the inner block support surface on the inner side of the upper side and the outer side on the outer side of the outer block a distance smaller than a distance between an inner side of the upper side of the inner block and a lower side of the outer block in a state in which the self-weight is not added in the vertical direction of the inner block; and the upper side of the outer block support The distance between the inner side outer block supporting surface and the outer side of the lower side of the outer block is smaller than the upper side and the outer side of the outer block in the state in which the self-weight is not added in the vertical direction of the outer block. The distance outside the lower edge of the block. The transformer of claim 4, wherein a mechanism for adjusting a distance between the inner block supporting surface or the outer block supporting surface and the outer side of the lower side of the winding core of the outer block is provided in the frame and the inner block Any one of the body support portion, the outer block supporting member, or the base of the transformer on which the winding core is placed. The transformer of claim 5, wherein the adjustment mechanism is adjusted by inserting a spacer or a threaded locking nut for cutting. A transformer according to claim 1, wherein the outer block supporting portion has a shape corresponding to a shape of an inner side of the upper side corner portion of the outer block. The transformer of claim 7, wherein the corresponding shape refers to a shape that follows the shape of the inner side of the upper corner portion of the outer block. The transformer of claim 7, wherein a radius of a corner portion of the core supporting surface of the outer block supporting portion is larger than a corner radius of the inner side of the upper portion of the outer block supported by the corner portion. The transformer according to claim 1, wherein the outer block supporting portion is supported by two or more bar members along a longitudinal direction of the upper side of the winding core, and is attached to the frame. A transformer comprising at least: a cylindrical coil formed by winding an electric wire; and a rolled core formed by laminating a magnetic material into a ring shape and incorporated into the coil a hollow portion; a frame that supports the coil and the wound core; and a core supporting member that penetrates the inner side of the wound core and is disposed on a vertical upper side of the frame, wherein the wound core is divided into concentric first blocks and a second block disposed on the outer side of the first block, wherein the core supporting member includes a first block supporting portion that supports the inner side of the upper portion of the first block vertically upward, and supports the first portion vertically upward a second block supporting portion on the inner side of the upper portion of the two blocks, and a supporting member that is disposed on the upper side of the first block supporting portion and that supports the second block supporting portion. The transformer according to claim 11, wherein a distance between the first block supporting surface on the inner side supporting the upper side of the first block supporting portion and the outer side of the lower side of the second block is smaller than the first block The distance between the inner side of the upper portion of the first block and the outer side of the lower portion of the second block in the state of the side surface portion of the body. The transformer of claim 11, wherein a distance between the second block supporting surface on the inner side supporting the upper side of the second block supporting portion and the outer side of the lower side of the second block is smaller than the second block The distance between the inner side of the upper portion of the second block and the outer side of the lower portion of the second block in the state of the side surface portion of the body. The transformer according to claim 11, wherein a distance between the first block supporting surface on the inner side supporting the upper side of the first block supporting portion and the outer side of the lower side of the second block is smaller than the first block The distance between the inner side of the upper portion of the first block and the outer side of the lower portion of the second block in the state of the side portion of the body; and the second block supporting the inner side of the upper portion of the second block supporting portion The distance between the support surface and the installation surface on the outer side of the lower side of the second block is smaller than the inner side of the upper portion of the second block and the lower side of the second block in a state in which the side surface portion of the second block is provided. The distance from the outside. The transformer according to claim 11, wherein the shape of the corner portion of the second block supporting portion is a shape of the inner side of the upper corner portion of the second block, and the radius of the corner portion is larger than the upper portion of the second block The radius inside the corner.