JP7365120B2 - stationary induction equipment - Google Patents

Description

The present invention relates to stationary induction equipment such as transformers and reactors.

Regarding stationary induction equipment that reduces iron loss, Patent Document 1 is known. Patent Document 1 states, ``Since the magnetic material 6 made of laminated electromagnetic steel plates of different lengths is arranged in the yoke part of the three-phase wound core 1, the flow from the leg part of the three-phase wound core 1 to the yoke part is prevented. The magnetic flux flows not only through the three-phase wound core 1 but also through the magnetic material 6, reducing the magnetic flux density at the yoke and reducing iron loss and noise compared to the case without the magnetic material 6.'' has been done.

Japanese Patent Application Publication No. 2002-208518

As disclosed in Patent Document 1, adding a ribbon-like magnetic material to the yoke core of a stationary induction device with a three-phase tripod wound core increases the cross-sectional area of the yoke core, thereby reducing magnetic flux density. This allows the iron loss of stationary induction equipment to be reduced.

However, because the magnetic resistance between the wound core and the added ribbon-shaped magnetic material is large, the amount of magnetic flux flowing between the wound core and the ribbon-shaped magnetic material is small, and the effect of increasing the cross-sectional area of the yoke core is limited. There is an issue where loss reduction is insufficient.

An object of the present invention is to provide a stationary induction device with an iron core that reduces iron loss.

As a preferred example of the present invention, a three-phase three-legged wound core includes two inner wound cores formed by winding a ribbon-shaped magnetic material and one outer wound core disposed on the outer periphery so as to cover the inner wound core. a first iron core, a coil wound around three magnetic legs of the first iron core, and a first surface facing the first iron core on which plate-shaped magnetic members are laminated; a second core on which no coil is wound and has a second surface opposite to the upper surface of the coil, and the plate-shaped magnetic member extends in the circumferential direction of the inner-wound core and the outer-wound core. This is a stationary guidance device characterized by being stacked toward each other .

According to the present invention, a stationary induction device with reduced iron loss can be realized.

1 is an overall view and a vertical cross-sectional view of a three-phase tripod type transformer of Example 1. FIG. 1 is a structural diagram of an iron core and an auxiliary iron core of a three-phase tripod type transformer of Example 1. FIG. FIG. 3 is a cross-sectional view of a connecting portion between an auxiliary core and a wound core in Example 1. Front and side views of the core of a three-phase tripod transformer. A comparison diagram of the structures of two types of auxiliary cores. Comparison of the distribution of magnetic flux density amplitude on the surface of two types of auxiliary cores. Relative comparison of iron loss values of three-phase tripod transformers. FIG. 7 is a vertical cross-sectional view of a three-phase tripod transformer for explaining Example 2. An overall view and a vertical cross-sectional view of Example 3. FIG. 3 is a structural diagram of an iron core and an auxiliary iron core in Example 3. FIG. 4 is a structural diagram of an auxiliary core and a front view of a three-phase three-legged core yoke portion of Example 4. FIG. 7 is a front view and a rear view of an upper yoke portion of a three-phase tripod type transformer in Example 5. An overall diagram of a three-phase tripod type transformer as a comparative example. FIG. 2 is a diagram showing Table 1 listing dimensions of each part of the iron core in Example 1.

Hereinafter, a plurality of embodiments of the present invention will be described in detail using the drawings.

1 to 7 are diagrams for explaining the first embodiment. First, the configuration and operation of this embodiment will be explained while comparing it with the comparative example shown in FIG. 13. FIG. 13 is a diagram showing a three-phase tripod type transformer as a comparative example that does not have the auxiliary core 10 of the present invention.

FIG. 1 is an overall view of a three-phase tripod type transformer according to the present embodiment, which is an example of stationary induction equipment such as a transformer or a reactor, and a longitudinal sectional view taken along the plane indicated by A in FIG. 1. The width of the transformer is shown in the X-axis direction, the depth in the Y-axis direction, and the height in the Z-axis direction.

Two inner-wound cores 1a formed by winding ribbon-shaped magnetic materials such as silicon steel plates or amorphous metal ribbons, and one outer core arranged around the outer periphery so as to cover the two inner-wound cores 1a. A wound core 1b is shown. These inner-wound core 1a and outer-wound core 1b are collectively referred to as a first core.

In addition, a three-phase tripod-type wound core, a low voltage winding 2a that constitutes three low voltage side coils, which are wound around the three magnetic legs of the iron core, and a high voltage winding that constitutes three high voltage side coils. line 2b is shown.

In contrast, in this embodiment, four rectangular parallelepiped-shaped second cores 10 ( The auxiliary core 10) is brought into close contact and fixed. Hereinafter, in this specification, the second core will be simply referred to as the auxiliary core 10.

The iron core and winding of a three-phase tripod transformer are connected to upper and lower fixing fittings 3a and lower fixing fittings 3b using stud bolts or the like (not shown) to provide a fixing force 6a. generate and grasp each member.

The fixing fittings 3a, 3b have a U-shaped cross section and are provided with a window 31 in a part of the side surface. A plate-shaped insulating member 51 such as insulating paper or press board, which is a plate-shaped insulating member, is inserted through this window 31 to generate a force that presses the auxiliary core 10 against the yoke portion of the three-phase tripod-type wound core. Then, fix the auxiliary core 10 from the window 31 side. The surface of the fixture 3a extending in the Z-axis direction may be inclined so that the tip portion thereof is closer to the outer wound core 1b than the root portion connected to the surface of the fixture 3a extending in the Y-axis direction.

In other words, the relationship in the depth direction between the root portion and the tip portion is that the distance in the depth direction of the root portion≧the sum of the depth distance of the outer wound core 1b and the depth distance of the two plate-shaped insulating members 51>the tip portion It is best to set the distance between them. Due to this relationship, the base portion can sandwich the insulating member 5, and the tip portion can improve the holding force between the auxiliary core 10 and the plate-shaped insulating member 51. In addition, when the window 31 is not provided in the fixing metal fittings 3a, 3b, it is preferable to attach the fixing metal fittings 3a, 3b after inserting the plate-shaped insulating member 51.

The arrangement of the insulating member 5 will be explained. The first insulating member 5 is placed in contact with the upper surface of the auxiliary iron core 10, which is the surface on the fixture 3a side, and the second insulating member 5 is brought into contact with the bottom surface, which is the fixture 3b side. Place. That is, by arranging the second insulating member 5 so as to contact the upper end surface of the low-voltage winding 2a and to contact the bottom surface of the auxiliary core 10, the position of the auxiliary core 10 in the vertical direction can be adjusted. can be fixed. Further, since the side surface of the auxiliary core 10 is pressed down by the plate-shaped insulating member 51 and the metal part of the fixture 3a located lower than the window 31, the auxiliary core 10 is difficult to fall off even if vibration occurs.

FIG. 2 is an overall view showing only the wound core of the three-phase tripod type transformer in this embodiment, and a structural diagram of the auxiliary core 10. Similarly to FIG. 1, the width of the transformer is shown in the X-axis direction, the depth in the Y-axis direction, and the height in the Z-axis direction. An outer wound core 1b is arranged to cover the outer periphery of two inner wound cores 1a arranged in the X-axis direction, and an auxiliary iron core 10 is arranged in the yoke portion.

The auxiliary core 10, which is the second core, has plate-shaped magnetic members 11 cut out into rectangular shapes stacked together. The arrow 10a indicates the direction in which the plate-shaped magnetic members 11 of the auxiliary core 10 are laminated. They are stacked in the X-axis direction, which is the width of the transformer. That is, they are laminated in a direction substantially perpendicular (including the orthogonal direction) to the longitudinal direction of the magnetic legs of the wound core so as to sandwich the window portion, and fixed in a rectangular parallelepiped shape by winding the fixing tape 12. Further, the auxiliary core 10 is fixed in the yoke part of the three-phase three-legged core in contact with both side surfaces of the inner core 1a and the outer core 1b.

FIG. 3 is a cross-sectional view showing details of the connection portion between the inner-wound core 1a and the outer-wound core 1b and the auxiliary core 10 of the three-phase tripod type transformer in this embodiment. Since the fixing tape 12 is wound around the outer circumference of the auxiliary core 10, the fixing tape 12 made of an insulating material is placed between the laminated surfaces of the thin strip magnetic material of the inner wound core 1a and the outer wound core 1b. A gap corresponding to the thickness G is provided. G is a gap between the auxiliary core 10, the inner-wound core 1a, and the outer-wound core 1b; if there is no gap, an eddy current will be generated between the inner-wound core 1a and the outer-wound core 1b, so if the predetermined gap is is necessary.

The auxiliary core 10 is arranged inside the fixture 3a. The surface of the fixture 3a that extends in the Y-axis direction and faces the outer wound core 1b is in contact with the top surface of the insulating member 5, and the bottom surface of the first insulating member 5 is in contact with the top surface of the auxiliary core 10. The upper side of the iron core 10 is fixed. The lower side of the auxiliary core 10 is fixed by contacting the upper surface of the insulating member 5 disposed on the low-voltage winding 2a constituting the coil. Therefore, the entire auxiliary core 10 is held.

6b shown in FIG. 1 is an arrow simulating the fixing force generated by the plate-shaped insulating member 51 shown in FIG. It is fixed and also fixed in the height direction by the two insulating members 5 that sandwich the auxiliary core 10 in the height direction (Z-axis direction).

The auxiliary core 10 is arranged at a position corresponding to the position of the window 31 provided on the side surface of the fixture 3a. That is, the auxiliary core 10 is arranged so as to cross the boundary between the yoke of the inner-wound core 1a and the yoke of the outer-wound core 1b, and when viewed from the window 31, the yoke of the inner-wound core 1a and the outer-wound core It is placed at a position that straddles the yoke of 1b. By arranging the auxiliary core 10 in this manner, magnetic flux leaking from the magnetic path can be stopped.

Next, with reference to FIGS. 4 to 7, the effect of reducing iron loss in the three-phase tripod type transformer according to this embodiment will be explained using calculation results of electromagnetic field analysis using the three-dimensional finite element method.

FIG. 4 is a dimensional drawing of a three-phase three-legged transformer core having an inner-wound core 1a, an outer-wound core 1b, and an auxiliary core 10, which are made of grain-oriented silicon steel plates. The left side shows the front view along the XZ axis, and the right side shows the side view along the YZ axis.

When the thickness a of the wound core in the stacking direction is taken as a reference, the dimensions of each part of the core are as shown in Table 1 of FIG. 14. The definitions of each part in Table 1 are as follows.

The thickness a in the lamination direction of the wound core is the thickness in the direction in which the thin strip magnetic materials of the inner wound core 1a and the outer wound core 1b are laminated, W1 is the outer width of the outer wound core 1b, and W2 is the thickness of the inner wound core 1a. , W3 is the thickness of the inner-wound core 1a and the outer-wound core 1b, H1 is the outer height of the outer-wound core 1b, H2 is the inner height of the inner-wound core 1a, and S is the outer periphery of the wound core. , W is the horizontal length of the auxiliary core 10 , H is the vertical length of the auxiliary core 10 , D is the length of the shorter side of the plate-shaped magnetic member that constitutes the auxiliary core 10 , and G indicates a gap between the auxiliary core 10, the inner core 1a, and the outer core 1b.

In the electromagnetic field analysis, the magnetization curve and iron loss characteristics of a grain-oriented silicon steel plate (23ZH85, manufactured by Nippon Steel & Sumitomo Metal Corporation) with a thickness of 0.23 mm were defined, and the space factor of the iron core was assumed to be 0.97. Adding a winding model to generate the desired magnetic flux density in the three-phase magnetic legs, applying a 50 Hz sine wave voltage thereto and setting the magnetic flux density amplitude of the core to 1.70 T, the winding core , the magnetic flux density distribution in the auxiliary core, and the total iron loss were calculated.

As shown in FIG. 5, in this analysis, the lamination direction 10a of grain-oriented silicon steel plates constituting the auxiliary core 10 is set in the Y-axis direction, which is the width direction of the transformer, in the same way as described in Example 1 shown in (a). The iron loss value was compared between the auxiliary core 10 when stacked in the auxiliary core 10 and the auxiliary core 10n disclosed in Patent Document 1 when stacked in the Z-axis direction, which is the vertical direction shown in (b).

In the first embodiment, the plate-shaped magnetic body constituting the auxiliary core 10 has a first surface facing the yoke parts of the inner-wound core 1a and the outer-wound core 1b, and a second surface facing the upper surface of the coil. A third surface is provided between the first surface and the second surface, and a fourth surface is provided on the upper side of the inner-wound core 1a and the outer-wound core 1b, which are the first cores. Further, the plate-shaped magnetic body constitutes the auxiliary core 10 by being laminated toward the circumferential direction of the inner-wound core 1a and the outer-wound core 1b. Although the auxiliary core 10 may include other members, it means that the main member is a plate-shaped magnetic body. Here, the circumferential direction is the direction of the outer periphery or inner periphery of the inner wound core 1a and the outer wound core 1b.

FIG. 6 shows calculation results of the distribution of magnetic flux density amplitude on the surface of the auxiliary core 10 provided in the wound core. (a) shows the case where the stacking direction 10a of the plate-shaped magnetic material members 11 of the auxiliary core 10 is set to the horizontal direction (X-axis direction), and (b) shows the case where the stacking direction 10a is set to the vertical direction. (a) When the stacking direction 10a is the horizontal direction (X-axis direction), the magnetic flux between the inner-wound core 1a and the outer-wound core 1b flows via the auxiliary core 10. On the other hand, (b) when the stacking direction 10a is the vertical direction (Z-axis direction), almost no magnetic flux flows between the inner-wound core 1a and the outer-wound core 1b, and the two inner-wound cores adjacent to each other at the yoke part It can be seen that the magnetic flux flows only between the iron cores 1a.

That is, the auxiliary core 10 of this embodiment has a configuration that can reduce iron loss due to eddy current in the auxiliary core 10 when the lamination direction 10a shown in (a) is horizontal (X-axis direction).

Based on the results of the above electromagnetic field analysis, FIG. 7 shows a comparison of the total values of iron losses occurring inside the inner-wound core 1a, the outer-wound core 1b, and the auxiliary core 10. In FIG. 7, the iron loss value of the wound core calculated when the auxiliary core 10 is not provided is set to 100%, and its relative value is shown.

In FIGS. 5 and 6, the plate-shaped magnetic member constituting the auxiliary core 10 has a rectangular main surface, and the longitudinal direction of the main surface faces the inner-wound core 1a and the outer-wound core 1b. However, the plate-shaped magnetic member 11 may have a rectangular shape, and may have a structure in which the transverse direction faces both the inner-wound core 1a and the outer-wound core 1b. That is, the size of each side of this auxiliary core is such that Y axis>Z axis, Y axis>X axis, and X axis≧Z axis. Further, the main surface may be square.

Furthermore, in FIGS. 5 and 6, the rolling direction of the individual plate-shaped magnetic members 11 constituting the auxiliary core 10 was explained as being arranged in the substantially vertical direction, but the rolling direction of the plate-shaped magnetic members 11 is , it may be in a substantially horizontal direction.

In the configuration of Example 1, the lamination direction of the auxiliary core 10 is a direction (X-axis direction) orthogonal to the lamination direction of the outer-wound core 1b and the inner-wound core 1a. The iron loss value when the lamination direction of the plate-shaped magnetic material members 11 of the auxiliary core 10 is set in the horizontal direction (X-axis direction) is smaller than when it is set in the vertical direction (Z-axis direction), and the three-phase tripod-wound core It can be seen that this has the effect of further reducing iron loss. Even when the auxiliary core 10 is laminated in a direction substantially perpendicular to the longitudinal direction of the magnetic legs of the three-phase three-legged transformer core, iron loss can be reduced.

According to Example 1, it is possible to reduce iron loss without changing the length of the conductor and the volume of the casing that constitute the winding of a stationary induction device composed of a three-phase tripod-type wound core, and the stationary induction device power efficiency can be improved. Further, when fixing the auxiliary core 10 provided on the side surface of the yoke of the three-phase tripod type wound core, no fastening bands, adhesives, etc. are required, so the number of components of the stationary induction device is reduced, so the number of components can be reduced. Furthermore, by manufacturing a transformer having the auxiliary core 10, the amount of various components used can be reduced, thereby contributing to energy saving.

In the example shown in FIG. 2, the auxiliary core 10 is placed in the yoke part of the three-phase tripod-type wound core at four locations: front, back, top, and bottom. The effect of loss reduction can be achieved. Moreover, by increasing the number of auxiliary cores 10 arranged, the effect of reducing iron loss can be enhanced.

Three-phase tripod type static electromagnetic equipment (static induction equipment) is currently widely used because its iron core is easy to manufacture. However, because the magnetic flux flowing in the two inner-wound cores 1a and one outer-wound core 1b has a characteristic that it is difficult for them to propagate to other wound cores, the amplitude of the designed magnetic flux density of three-phase stationary electromagnetic equipment As a result, the magnetic flux density amplitude in each core is multiplied by 2/√3.

Therefore, compared to a laminated core in which plate-shaped magnetic materials are laminated and the magnetic path within the core is made of a single magnetic material, it is necessary to design the core to have a cross-sectional area approximately 15% larger, and the entire wound core The iron loss that occurs in this case increases.

In Patent Document 1, since the lamination direction of the ribbon-shaped magnetic material in the wound core and the added ribbon-shaped magnetic material is the same, the effect of mutually propagating the magnetic flux in each core of the three-phase tripod core is not assumed. The magnetic flux density amplitude in each core is 2/√3 times the design magnetic flux density amplitude, as in the conventional case.

On the other hand, the stacking direction of the auxiliary core of this embodiment is arranged in the horizontal direction (X-axis direction) that is substantially orthogonal to the stacking direction (Z-axis) of the outer-wound core 1b and the inner-wound core 1a, which makes it possible to It is possible to reduce iron loss compared to . Furthermore, when manufacturing an iron core with the same iron loss value as the conventional one, it is possible to make the cross-sectional area smaller than the conventional one.

Example 2 will be described using FIG. 8. FIG. 8 is a longitudinal sectional view similar to plane A shown in the overall view of the three-phase tripod type transformer shown in FIG. The difference from the first embodiment is that the shape of the fixture 3m is different, and that an insulating member 52 is disposed between the side surface of the fixture 3m and the auxiliary iron core 10. Another difference is that the fixture 3m is not provided with a window 31.

As in Example 1, the core and winding of the three-phase tripod transformer are fixed by connecting fixing fittings 3m with stud bolts or the like (not shown) to generate a fixing force 6a in the vertical direction. Here, the side surface of the fixture 3m is a surface extending in the ZY-axis direction.

After fixing the auxiliary iron core 10, the angle between the side surface and the top surface of the fixture 3m is larger than the angle between the side surface and the top surface of the fixture 3m before the auxiliary core 10 is fixed. With such a configuration, a fixing force 6b acts from the fixing metal fitting 3m to press down the insulating member 52 and the auxiliary core 10 inside the fixing metal fitting 3m in the direction of the inner wound iron core 1a and the outer wound iron core 1b.

An insulating member 52 having a wedge-shaped cross section is arranged outside the auxiliary core 10. The wedge-shaped insulating member 52 is applied to the auxiliary core 10, and as described above, the fixing force 6b is generated from the fixture 3m to the auxiliary core 10 to the side surface of the three-phase three-legged wound core. Further, similarly to the fixing fitting 3a of the first embodiment, an insulating member 5 is provided inside the fixing fitting 3m and at the end of the low-voltage winding 2a, and the auxiliary core 10 is connected to the upper part of the inner wound core 1a. and fix the lower part where the coil is.

According to the second embodiment, the fixture can be made smaller and simpler than the first embodiment. Moreover, since the amount of plate-shaped magnetic material member 11 used can be reduced, it is possible to contribute to energy saving not only in the operation of the transformer but also in the entire manufacturing process.

Example 3 will be described using FIGS. 9 and 10. FIG. 9 is an overall view of the three-phase tripod type transformer of this embodiment, and a longitudinal sectional view taken along the plane indicated by A in the figure. The difference from the second embodiment is that the cross section of the auxiliary core 10m is trapezoidal, and the first insulating member 5 shown in FIG. 8 and the insulating member 52 disposed on the side surface of the auxiliary core 10 are not used.

In the third embodiment, the plate-shaped magnetic member 11 constituting the auxiliary core 10 has a first surface facing the yoke portions of the inner-wound core 1a and the outer-wound core 1b, and a second surface facing the upper surface of the coil. and at least an inclined third surface between the first surface and the second surface.

The core and winding of the three-phase tripod type transformer are fixed by connecting fixing fittings 3m provided above and below with stud bolts or the like (not shown) to generate a fixing force 6a.

As shown in FIG. 9, the fixing fitting 3m, which is a fixing part, has a side surface and a top surface, and the inner angle of the side surface and top surface after fixing the auxiliary core 10 is such that the auxiliary core 10 is fixed. It is larger than the inside angle of the front side and top parts. As in the second embodiment, a fixing force 6b that presses down the plate-shaped insulating member 53 and the auxiliary core 10 inside is exerted from the fixing fitting 3m.

The side surface of the upper fixing fitting 3m is slanted, and a plate-shaped insulating member 53 is applied to the outside of the auxiliary core 10 to generate a force 6b for fixing the auxiliary core 10 to the side surface of the three-phase three-legged wound core. . Further, an insulating member 5 is provided at the upper end of the low-voltage winding 2a constituting the coil to fix the lower side of the auxiliary iron core 10m, which is the coil side. Furthermore, the fixing force 6b from the fixing fitting 3m via the plate-shaped insulating member 53 is applied to the upper part of the auxiliary core 10, which is the upper part of the inner-wound core 1a and the outer-wound core 1b, and the side surface of the three-phase tripod transformer. The direction is also fixed. Therefore, the auxiliary iron core 10m is fixed in the vertical and lateral directions.

FIG. 10 is an overall view showing only the core of the three-phase tripod type transformer in this example, and a structural diagram of the auxiliary core 10m. The auxiliary iron core 10 is made by cutting rectangular plate-shaped magnetic material members 11 along the cutting line 13, stacking them in the horizontal direction (X-axis direction) shown by the arrow 10a, and wrapping the fixing tape 12 so that the cross section is trapezoidal. Fix the column. In this embodiment, the plate-shaped magnetic member 11 with a trapezoidal cross section was explained as an example in consideration of ease of processing and work. Even if the iron is used, there is an effect of reducing iron loss.

In addition, the auxiliary core 10 is provided in the yoke portion of the three-phase three-legged core, in contact with the side surfaces of both the inner core 1a and the outer core 1b, and is auxiliary using the upper fixing fitting 3m as described above. Hold the iron core 10m. The lower part of the core can also hold 10 m of auxiliary core with the same structure as the fixing metal fitting 3 m.

According to Example 3, compared to Example 2, the width of the upper fixing bracket 3 m and the lower fixing bracket can be reduced, and the leakage magnetic field from the windings interlinking the fixing bracket is reduced, so that the fixing bracket It is possible to reduce stray losses that occur in

FIG. 11 is a structural diagram of the auxiliary core 10 of Example 4 and a front view of the yoke portion of the three-phase three-legged wound core. Description of parts common to Example 1 will be omitted. In Example 4, a plurality of auxiliary iron cores 10 are stacked in the horizontal direction (X-axis direction) as shown by the arrow 10a, and a plurality of auxiliary cores 10 are fixed in a rectangular parallelepiped shape by winding the fixing tape 12. It is fixed in contact with the side surfaces of both the inner-wound core 1a and the outer-wound core 1b of the type-wound core yoke portion. The auxiliary core 10, the core of the three-phase tripod transformer, and the windings are fixed using the fixing fittings 3a, 3m, etc. shown in Examples 1 to 3.

According to the fourth embodiment, since the auxiliary core 10 is divided into a plurality of auxiliary cores 10, the auxiliary core 10 can be manufactured easily.

FIG. 12 is a front view and a rear view of the upper yoke portion of the three-phase tripod type transformer in Example 5. Description of parts common to Example 1 will be omitted. Embodiment 5 (a) shows two auxiliary iron cores 10 arranged in fixing fittings 3a and 3m on the extraction side of the low-voltage electrode 21 provided with the low-voltage electrode 21 of the coil and fixed in contact with the insulating member 5. An example is shown in which a gap is provided in a portion corresponding to the low voltage electrode 21. On the other hand, the high voltage electrode extraction side on the opposite side can be arranged in the same manner as the upper side.

According to the structure of Example 5 (a), the auxiliary iron core 10 can be placed so that the low voltage electrode 21 avoids the position of the auxiliary iron core 10 . In this case, magnetic flux can be made less likely to leak from the boundary between the inner-wound core 1a and the outer-wound core 1b, and iron loss is reduced more than in the past.

Regarding the extraction side of the high-voltage electrode shown in FIG. 12(b), the configuration may be such that the auxiliary iron core 10 and the fixing fittings are not arranged so as not to create a discharge path.

Furthermore, in FIG. 12, the high-voltage electrode and low-voltage electrode 21 connected to the winding, which is a coil, are taken out from the top of the stationary induction device, but the electrodes may be taken out from the bottom. In that case as well, the configuration may be such that the auxiliary iron core 10 and the fixing fittings are not arranged on the extraction side of the high-voltage electrode so as not to create a discharge path.

In the above embodiment, the materials of the inner core 1a, the outer core 1b, the auxiliary cores 10, 10m, etc. are grain-oriented electrical steel sheets represented by grain-oriented silicon steel sheets, iron-based amorphous alloys, nanocrystalline materials, etc. Materials selected from can be used. The auxiliary cores 10 and 10m may be made of different materials depending on the location where they are placed. In this case, auxiliary iron cores 10 and 10 m made of different materials are used to suit the amount of magnetic flux leakage at the location where they are placed. Furthermore, the inner-wound core 1a, the outer-wound core 1b, and the auxiliary core 10 may be made of the same material, or may be made of different materials.

1a: Inner winding core 1b: Outer winding core 2a: Low voltage winding 2b: High voltage winding 10: Auxiliary core 11: Plate magnetic material member

Claims (19)

a first core that is a three-phase three-legged core that includes two inner cores formed by winding a thin ribbon-shaped magnetic material and one outer core disposed on the outer periphery so as to cover the inner core;
a coil wound around three magnetic legs of the first iron core;
a second iron core on which plate-shaped magnetic members are laminated;
The second iron core has a first surface that faces a portion of the first iron core where the coil is not wound, and a second surface that faces the upper surface of the coil, and The stationary induction device is characterized in that the inner-wound core and the outer-wound core are laminated in a circumferential direction. The stationary induction device according to claim 1,
The first iron core has both a front side and a back side,
A stationary induction device comprising the second iron core on the front side. The stationary induction device according to claim 1,
A stationary induction device comprising a fixing part for fixing the second iron core. The stationary induction device according to claim 3,
The fixing part has a side part and a top part,
After fixing the second iron core, the inner angle between the side surface portion and the top surface portion is:
A stationary induction device characterized in that the angle is larger than the inner angle between the side surface portion and the top surface portion before the second iron core is fixed. The stationary induction device according to claim 1,
The second iron core is configured by laminating a plurality of plate-shaped magnetic members,
A stationary induction device characterized in that the rolling direction of the plate-shaped magnetic member is substantially vertical. The stationary induction device according to claim 1,
A stationary induction device characterized in that the coil has a low voltage winding and a high voltage winding. The stationary induction device according to claim 1,
The stationary induction device is characterized in that the second iron core is arranged so as to straddle the inner-wound iron core and the outer-wound iron core. The stationary induction device according to claim 7,
having a fixing part for fixing the second iron core and having a window part;
The stationary induction device is characterized in that the second core is arranged so as to straddle the inner-wound core and the outer-wound core when viewed from the window. The stationary induction device according to claim 3 ,
A stationary induction device characterized in that a wedge-shaped insulator is disposed between the fixed part and the second iron core. The stationary induction device according to claim 1,
The coils are a high voltage coil and a low voltage coil,
A stationary induction device characterized in that the second iron core is not arranged on the high voltage electrode extraction side. The stationary induction device according to claim 1,
The plate-shaped magnetic member constituting the second iron core is
A stationary induction device characterized in that the first iron core is laminated in a direction substantially perpendicular to the longitudinal direction of the magnetic legs. The stationary induction device according to claim 1,
A stationary induction device characterized in that an insulating member is provided in a gap between the second iron core and the first iron core. The stationary induction device according to claim 1,
The second iron core is configured by laminating rectangular plate-shaped magnetic members,
arranging a fixing fitting with a window on the first iron core;
Due to the plate-shaped insulating member inserted through the window,
A stationary induction device characterized in that the second iron core is pressed against and fixed to the three-phase three-legged wound iron core. The stationary induction device according to claim 1,
The second iron core is configured by laminating rectangular plate-shaped magnetic members,
A fixing fitting with an oblique side surface is arranged on the first iron core,
The fixing metal fittings are
A stationary induction device, characterized in that the second iron core is pressed and fixed to the three-phase tripod-shaped wound iron core via a wedge-shaped insulating member on the outside of the rectangular parallelepiped-shaped second iron core. The stationary induction device according to claim 1,
The second iron core is configured by laminating trapezoidal plate-shaped magnetic members,
A fixing fitting with an oblique side surface is arranged on the first iron core,
A stationary induction device characterized in that the fixing fitting presses and fixes the trapezoidal columnar second core against the three-phase three-legged wound core. The stationary induction device according to claim 1,
A stationary induction device characterized in that a tape is wound around the second iron core provided in the first iron core. The stationary induction device according to claim 1,
A stationary induction device, wherein the second core is disposed at a position facing a laminated surface of the ribbon-shaped magnetic material of the yoke portion of the first core. The stationary induction device according to claim 1,
The stationary induction device is characterized in that a plurality of the second cores are arranged in a horizontal direction and are arranged to face a laminated surface of the ribbon-shaped magnetic material of the yoke portion of the first core. The stationary induction device according to claim 1,
The first iron core and the second iron core are
The first iron core and the second iron core are made of the same material or different materials. stationary induction equipment.

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