JP7149908B2 - Static induction device - Google Patents

Description

The present invention relates to static induction devices such as transformers and reactors.

Patent Document 1 is known for a stationary induction device that reduces iron loss. In Patent Document 1, "Since the magnetic material 6 in which electromagnetic steel sheets with different lengths are laminated is arranged in the yoke portion of the three-phase wound core 1, the flow from the leg portion of the three-phase wound core 1 to the yoke portion is described. The generated magnetic flux flows not only to the three-phase wound core 1 but also to the magnetic material 6, reducing the magnetic flux density in the yoke portion, thereby reducing iron loss and noise as compared with the case without the magnetic material 6." It is

Japanese Patent Application Laid-Open No. 2002-208518

As disclosed in Patent Document 1, adding a ribbon-shaped magnetic material to the yoke core portion of a stationary induction device having a three-phase tripod-type wound core increases the cross-sectional area of the yoke core, thereby reducing the magnetic flux density. and can reduce the iron loss of stationary induction equipment.

However, since the magnetic resistance between the wound core and the additional thin strip magnetic material is large, the amount of magnetic flux flowing between the wound core and the thin strip magnetic material is small, and the effect of increasing the cross-sectional area of the yoke core is limited. There is a problem that loss reduction is insufficient.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stationary induction device with an iron core that reduces iron loss.

A stationary induction device, which is a preferred example of the present invention, is arranged so as to cover a first inner core and a second inner core arranged in two, and the first inner core and the second inner core. a first core including an outer core, a coil wound around the first inner core , the second inner core, and the outer core; and a first coil facing the yoke portion of the first core. , a second surface facing the top surface of the coil, and a third surface between the first surface and the second surface; a second iron core laminated in a circumferential direction of the iron core, wherein a support member is arranged on a surface of the second iron core opposite to the surface of the first iron core; The members are connected via a member passing through a gap provided between the first inner core, the second inner core, and the outer core, and the coils are a high-voltage coil and a low-voltage coil. It is characterized in that the second iron core is not arranged on the high-voltage electrode lead-out side .

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

1 is an overall view and a longitudinal sectional view of a three-phase tripod transformer of Example 1. FIG. 4 is a structural diagram of the core and the auxiliary core of the three-phase tripod transformer of Example 1. FIG. 4 is a cross-sectional view of a connecting portion between the auxiliary core and the wound core of Example 1. FIG. FIG. 4A is a front view and a side view of the iron core of the three-phase tripod transformer; FIG. 4 is a comparison diagram of two types of auxiliary core structures; FIG. 5 is a diagram showing a comparison of distributions of magnetic flux density amplitudes on surfaces of two types of auxiliary cores; FIG. 5 is a diagram showing a relative comparison of iron loss values of three-phase three-legged transformers; FIG. 10 is a vertical cross-sectional view of a three-phase tripod transformer for explaining Example 2; It is the whole view and longitudinal section of Example 3. FIG. FIG. 11 is a structural diagram of an iron core and an auxiliary iron core of Example 3; FIG. 11 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. 11 is a front view and rear view of an upper yoke portion of a three-phase tripod transformer in Example 5; 1 is an overall view of a three-phase tripod transformer as a comparative example; FIG. 2 is a diagram showing Table 1 that describes dimensions of each part of the iron core of Example 1. FIG. FIG. 11 is an overall view of a three-phase tripod transformer of Example 6; FIG. 11 is a front view of a three-phase tripod transformer of Example 6; FIG. 11 is a front view of a three-phase tripod transformer that is a modification of Example 6;

A plurality of embodiments of the present invention will now be described in detail with reference to the drawings.

1 to 7 are diagrams for explaining the first embodiment. First, the configuration and effects of this embodiment will be described in comparison with the comparative example shown in FIG. FIG. 13 is a diagram showing a three-phase tripod 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 transformer, which is an example of a stationary induction device such as a transformer and a reactor, and a vertical cross-sectional view along the plane indicated by A in FIG. 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 a ribbon-shaped magnetic material represented by a silicon steel plate or an amorphous metal ribbon, and one outer wound core 1a arranged on 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 called a first core.

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

On the other hand, in this embodiment, four second iron cores 10 ( The auxiliary core 10) is brought into close contact and fixed. Henceforth, in this specification, the second core will be simply referred to as the auxiliary core 10 for explanation.

The iron core and windings of the three-phase tripod transformer are connected by means of stud bolts (not shown) or the like (not shown) to secure the fixing force 6a. Generate and grip each member.

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

That is, the relationship in the depth direction between the root portion and the tip portion is such that the depth direction distance 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 good to set it as the distance between them. Due to this relationship, the root 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. FIG. If the fixtures 3a and 3b are not provided with the windows 31, the fixtures 3a and 3b should be attached after the plate-shaped insulating member 51 is inserted.

Arrangement of the insulating member 5 will be described. The first insulating member 5 is placed in contact with the upper surface of the auxiliary iron core 10 on the side of the fixture 3a, and the second insulating member 5 is placed in contact with the lower surface of the fixture 3b. to place. That is, the second insulating member 5 contacts the surface of the upper end of the low-voltage winding 2 a and the bottom surface of the auxiliary core 10 . can be fixed. In addition, since the side surface of the auxiliary core 10 is pressed by the plate-like insulating member 51 and the metal fitting portion of the fixing metal fitting 3a positioned lower than the window 31, the auxiliary core 10 is less likely to fall off even if vibration occurs.

FIG. 2 is an overall view showing only the wound core of the three-phase tripod transformer in this embodiment, and a structural view of the auxiliary core 10. As shown in FIG. As 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. An outer wound core 1b is arranged so as to cover the outer periphery of two inner wound cores 1a arranged in the X-axis direction, and an auxiliary core 10 is arranged in a yoke portion.

An auxiliary core 10, which is a second core, is formed by laminating plate-shaped magnetic members 11 cut into rectangular shapes. An 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, the magnetic legs of the wound core are laminated in a direction substantially orthogonal to the longitudinal direction (including the orthogonal direction) so as to sandwich the window, and the fixing tape 12 is wound and fixed in a rectangular parallelepiped shape. Further, the auxiliary core 10 is fixed in contact with both side surfaces of the inner wound core 1a and the outer wound core 1b in the yoke portion of the three-phase tripod wound core.

FIG. 3 is a cross-sectional view showing the details of the connections between the inner wound core 1a and the outer wound core 1b of the three-phase tripod transformer in this embodiment, and the auxiliary core 10. As shown in FIG. Since the fixing tape 12 is wound around the outer periphery of the auxiliary core 10, the fixing tape 12 made of an insulating member is provided between the inner wound core 1a and the lamination surface of the ribbon-shaped magnetic material of the outer wound core 1b. A gap corresponding to the thickness G is provided. G is the gap between the auxiliary core 10 and the inner wound core 1a and the outer wound core 1b. is necessary.

The auxiliary core 10 is arranged inside the fixture 3a. The surface of the fixture 3a extending in the Y-axis direction and facing the outer wound core 1b is in contact with the upper surface of the insulating member 5, and the lower surface of the first insulating member 5 and the upper surface of the auxiliary core 10 are in contact with each other. The upper side of iron core 10 is fixed. The lower surface of the auxiliary core 10 contacts the upper surface of the insulating member 5 arranged on the low-voltage winding 2a that constitutes the coil, whereby the lower side of the auxiliary core 10 is fixed. 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. In addition to being fixed, the auxiliary core 10 is also fixed in the height direction by 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. In other words, 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. It is arranged at a position straddling the yoke of 1b. By arranging the auxiliary core 10 in this way, the magnetic flux leaking from the magnetic path can be stopped.

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

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

When the thickness a in the lamination direction of the wound core is used as a reference, the dimensions of each part of the core are as shown in Table 1 of FIG. The definition of each part in Table 1 is as follows.

The thickness a of the wound core in the lamination direction is the thickness in the lamination direction of the ribbon-shaped magnetic material of the inner wound core 1a and the outer wound core 1b, W1 is the outer width of the outer wound core 1b, and W2 is 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, S is the outer circumference 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-like magnetic member that constitutes the auxiliary core 10, G indicates the gap between the auxiliary core 10, the inner wound core 1a and the outer wound core 1b.

In the electromagnetic field analysis, the magnetization curve and iron loss characteristics of a 0.23 mm thick oriented silicon steel sheet (23ZH85 manufactured by Nippon Steel & Sumikin Co., Ltd.) were defined, and the lamination factor of the core was set to 0.97. A winding model is added to generate a desired magnetic flux density in the three-phase magnetic legs. , and the magnetic flux density distribution in the auxiliary core and the total value of iron loss were calculated.

As shown in FIG. 5, in this analysis, the lamination direction 10a of the oriented silicon steel sheets forming the auxiliary core 10 is the Y-axis direction, which is the width direction of the transformer, as described in the first embodiment shown in (a). and the auxiliary core 10n laminated in the Z-axis direction, which is the vertical direction shown in FIG.

In Example 1, the plate-like magnetic body 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, a second surface facing the upper surface of the coil, It has a third surface between the first surface and the second surface, and a fourth surface on the upper side of the inner wound core 1a and the outer wound core 1b, which are the first core. Further, the plate-shaped magnetic bodies constitute the auxiliary core 10 by being laminated in the circumferential direction of the inner wound core 1a and the outer wound core 1b. Although the auxiliary core 10 may have other members, it means that the main member is a plate-shaped magnetic body. Here, the circumferential direction is the direction of the outer circumference or the inner circumference of the inner wound core 1a and the outer wound core 1b.

FIG. 6 shows the calculation result of the distribution of the 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-like magnetic members 11 of the auxiliary core 10 is horizontal (X-axis direction), and (b) shows the case where it is vertical. (a) When the lamination 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 lamination direction 10a is the vertical direction (the Z-axis direction), almost no magnetic flux flows between the inner wound core 1a and the outer wound core 1b, and the two inner windings adjacent to each other at the yoke portion do not flow. It can be seen that the characteristic that the magnetic flux flows appears only between the iron cores 1a.

In other words, the auxiliary core 10 of the present embodiment is configured to reduce core loss due to eddy current in the auxiliary core 10 when the lamination direction 10a shown in (a) is the horizontal direction (X-axis direction).

FIG. 7 shows a comparison of the total value of iron losses generated inside the inner wound core 1a, the outer wound core 1b, and the auxiliary core 10 based on the results of the above electromagnetic field analysis. In FIG. 7, the core loss value of the wound core calculated when the auxiliary core 10 is not provided is assumed to be 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 material member 11 may be rectangular and may have a configuration in which the lateral direction faces both the inner wound core 1a and the outer wound core 1b. In other words, the size of each side of this auxiliary core has a relationship of Y axis>Z axis, Y axis>X axis, and X axis≧Z axis. Also, the main surface may be square.

5 and 6, an example in which the rolling direction of the individual plate-shaped magnetic members 11 constituting the auxiliary core 10 is arranged in the substantially vertical direction has been described, but the rolling direction of the plate-shaped magnetic members 11 is , may be substantially horizontal.

In the configuration of the first embodiment, the lamination direction of the auxiliary cores 10 is the 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 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). It can be seen that there is an effect of further reducing the iron loss of Even when the auxiliary core 10 is laminated in a direction substantially perpendicular to the longitudinal direction of the magnetic legs of the core for a three-phase tripod transformer, the iron loss can be reduced.

According to the first embodiment, it is possible to reduce the iron loss without changing the length of the conductors constituting the windings of the static induction device composed of the three-phase tripod wound iron core and the volume of the casing. power efficiency can be improved. In addition, when fixing the auxiliary core 10 provided on the yoke side of the three-phase tripod wound core, a fastening band, adhesive, etc. are not required, so the number of parts of the stationary induction device can be reduced. As a result, the amount of various materials used can be reduced through the manufacture of the transformer having the auxiliary core 10, thereby contributing to energy saving.

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

Three-phase tripod-type stationary electromagnetic equipment (stationary induction equipment) is widely used today because of its excellent manufacturability of the iron core. However, since the magnetic fluxes flowing in the two inner wound cores 1a and the one outer wound core 1b are difficult to propagate to other wound cores, As a result, the magnetic flux density amplitude in each wound core becomes 2/√3 times.

Therefore, it is necessary to design the cross-sectional area of the iron core to be about 15% larger than that of a laminated iron core in which plate-shaped magnetic materials are laminated and the magnetic path inside the iron core is made of a single magnetic material. The iron loss that occurs in

In Patent Document 1, since the lamination direction of the ribbon-shaped magnetic material in the wound core and the ribbon-shaped magnetic material to be added is the same, the effect of mutually propagating the magnetic flux in each wound core of the three-phase three-phase core is assumed. The magnetic flux density amplitude in each wound core is 2/√3 times the designed magnetic flux density amplitude, as in the conventional case.

On the other hand, the lamination direction of the auxiliary cores of the present embodiment is arranged in the horizontal direction (X-axis direction) substantially perpendicular to the lamination direction (Z-axis) of the outer wound core 1b and the inner wound core 1a. iron loss can be reduced compared to As a result, 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.

A second embodiment will be described with reference to FIG. FIG. 8 is a vertical cross-sectional view similar to plane A shown in the general view of the three-phase tripod transformer shown in FIG. A different point from the first embodiment is that the shape of the fixture 3m is different, and an insulating member 52 is arranged between the side portion of the fixture 3m and the auxiliary core 10. FIG. Another difference is that a window 31 is not provided in the fixture 3m.

As in the first embodiment, the iron core and windings of the three-phase tripod transformer are fixed by connecting the fixing metal 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 fixing metal fitting 3m is a surface extending in the ZY-axis direction.

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

An insulating member 52 having a wedge-shaped cross section is arranged outside the auxiliary core 10 . A wedge-shaped insulating member 52 is brought into contact with the auxiliary core 10, and as described above, a fixing force 6b is generated from the fixture 3m to the auxiliary core 10 to the side surface of the three-phase tripod wound core. Further, similarly to the fixing metal fitting 3a of the first embodiment, the insulating member 5 is provided inside the fixing metal fitting 3m and at the end of the low-voltage winding 2a, and the auxiliary core 10 is positioned above the inner wound core 1a. and fix the downward direction with the coil.

According to the second embodiment, compared with the first embodiment, the fixture can be made smaller and simpler. In addition, since the amount of the plate-like 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 throughout the entire manufacturing process.

Example 3 will be described with reference to FIGS. 9 and 10. FIG. FIG. 9 is an overall view of the three-phase tripod transformer of this embodiment, and a vertical cross-sectional view taken along the plane indicated by A in the figure. The difference from Example 2 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 arranged on the side surface of the auxiliary core 10 are not used.

In Example 3, the plate-shaped magnetic member 11 that constitutes 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 iron core and windings of the three-phase tripod transformer are fixed by connecting fixing metal fittings 3m provided at the top and bottom with stud bolts or the like (not shown) to generate a fixing force 6a.

As shown in FIG. 9, the fixing bracket 3m, which is the fixing part, has a side surface and a top surface. Greater than the inside angle of the front side and top. As in the second embodiment, a fixing force 6b that presses down the plate-like insulating member 53 and the auxiliary iron core 10 inside acts from the fixing metal fitting 3m.

The side surface of the upper fixing metal fitting 3m is slanted, and a plate-shaped insulating member 53 is applied to the outside of the auxiliary core 10 to generate a fixing force 6b for fixing the auxiliary core 10 to the side surface of the three-phase tripod wound core. . An insulating member 5 is provided at the upper end of the low-voltage winding 2a that constitutes the coil, and the lower side of the auxiliary core 10m, which is the coil side, is fixed. Furthermore, the fixing force 6b from the fixing metal fitting 3m through the plate-shaped insulating member 53 causes the upward direction 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 vertical and lateral directions of the auxiliary core 10m are fixed.

FIG. 10 is an overall view showing only the core of the three-phase tripod transformer in this embodiment, and a structural drawing of the auxiliary core 10m. Auxiliary iron core 10 is made by cutting out rectangular plate-shaped magnetic members 11 along cutting line 13, stacking them in the horizontal direction (X-axis direction) indicated by arrow 10a, winding fixing tape 12, and forming a trapezoidal cross section. to fix the column. In the present embodiment, the plate-shaped magnetic member 11 having a trapezoidal cross section was described as an example in consideration of ease of processing and work. There is an effect of iron loss reduction even when

Further, the auxiliary core 10 is in contact with both the side surfaces of the inner wound core 1a and the outer wound core 1b at the yoke portion of the three-phase tripod wound core, and is supported by the upper fixing metal fittings 3m as described above. A 10 m iron core is held. The core lower side can also hold the auxiliary core 10m with a structure similar to that of the fixture 3m.

According to the third embodiment, compared with the second embodiment, the width of the upper fixing metal fitting 3m and the lower fixing metal fitting can be reduced, and the leakage magnetic field from the windings interlinking the fixing metal fittings is reduced. It is possible to reduce the stray loss that occurs in

FIG. 11 is a structural diagram of an auxiliary core 10 of Example 4 and a front view of a yoke portion of a three-phase tripod wound core. Descriptions of portions common to the first embodiment are omitted. In the fourth embodiment, plate-like magnetic members 11 are laminated in the horizontal direction (X-axis direction) indicated by an arrow 10a, a fixing tape 12 is wound around them, and a plurality of auxiliary iron cores 10 fixed in a rectangular parallelepiped shape are mounted on a three-phase tripod. The side surfaces of the inner wound core 1a and the outer wound core 1b of the type wound core yoke portion are fixed in contact with each other. The auxiliary core 10, the core of the three-phase tripod transformer, and the windings are fixed using the fixing metal fittings 3a and 3m shown in the first to third embodiments.

According to the fourth embodiment, since it is divided into a plurality of auxiliary cores 10, manufacturing of the auxiliary cores 10 is facilitated.

12A and 12B are a front view and a rear view of an upper yoke portion of a three-phase tripod transformer in Example 5. FIG. Descriptions of portions common to the first embodiment are omitted. In (a) of the fifth embodiment, two auxiliary cores 10 are arranged in fixing metal 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 lead-out side on the opposite side can be arranged in the same manner as the upper side.

According to the structure of (a) of the fifth embodiment, the low-voltage electrode 21 allows the auxiliary core 10 to be arranged while avoiding the low-voltage electrode 21 . In this case, the 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 can be reduced more than conventionally.

On the high-voltage electrode lead-out side shown in FIG. 12(b), the auxiliary core 10 and the fixture may be omitted so as not to create a discharge path.

In FIG. 12, the high-voltage electrode and the low-voltage electrode 21 connected to the windings, which are coils, are taken out from the upper part of the stationary induction device, but the electrodes may be taken out from the lower part. Also in this case, the auxiliary core 10 and the fixture may be omitted so as not to create a discharge path on the high-voltage electrode lead-out side.

In the above embodiment, the materials of the inner wound core 1a, the outer wound core 1b, the auxiliary cores 10 and 10m, etc. are grain-oriented electrical steel sheets represented by grain-oriented silicon steel sheets, iron-based amorphous alloys, nanocrystalline materials, or the like. can be used. Auxiliary cores 10, 10m made of different materials can be used depending on the place of placement. In this case, auxiliary iron cores 10, 10m made of different materials are used to suit the amount of magnetic flux leakage at the place where they are arranged. Further, 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.

Example 6 will be described with reference to FIGS. 15 and 16. FIG. FIG. 15 shows a perspective view showing the entire three-phase tripod transformer of this embodiment on the left, and a vertical cross-sectional view on the plane indicated by A in the perspective view on the right. In this embodiment, a gap is provided between an inner wound core 100a (hereinafter simply referred to as "inner core 100a") and an outer wound core 100b (hereinafter simply referred to as "outer core 100b") shown in FIG. This is an example of a structure for fixing, supporting or holding an auxiliary core that makes effective use of 6000. The void 6000 is also called a window.

An auxiliary iron core 1000 is arranged along the winding direction of the iron core on the yoke portions of the outer iron core 100b and the inner iron core 100a, and an auxiliary iron core pressing metal fitting 2000 is attached to the outer side of the arranged auxiliary iron core 1000. The auxiliary core retainer fitting 2000 is a supporting member for the auxiliary core 1000 .

The auxiliary core pressing metal fitting 2000 should have a length equal to or longer than the long side of the auxiliary core 1000 . As a result, the auxiliary core retainer 2000 can press the entire auxiliary core 1000 toward the inner core 100a and the outer core 100b, and the gap between the auxiliary core 1000, the inner core 100a, and the outer core 100b can be reduced, so that leakage flux can be further reduced. less likely to occur.

Next, an insulating member 3000 having a predetermined thickness is sandwiched between the core (inner core 100a and outer core 100b) of the three-phase tripod transformer and the auxiliary core 1000, and extends outward from the lower part of the auxiliary core 1000. , so as to cover up to the auxiliary core pressing metal fitting 2000. Next, the holes provided in the insulating member 3000 in advance and the holes provided in the auxiliary core pressing metal fitting 2000 are aligned. Then, the rod-shaped member 4000 is passed through the aligned holes from the outside toward the gap 6000 .

Each member (auxiliary core 1000, auxiliary core retainer 2000, insulating member 3000) is similarly arranged on the opposite side of the core of the three-phase tripod transformer, and the core of the three-phase tripod transformer (inner core 100a and outer core 100a) is arranged. It is a structure in which nuts 5000 are used to fasten both sides of a rod-shaped member 4000 passing through a gap 6000 to the opposite side of the iron core 100b).

In Examples 1 to 5, the insulation member is wound around the auxiliary core to secure the gap between the core of the three-phase tripod transformer and the auxiliary core, and the thickness of the insulation member varies depending on the work. On the other hand, in the present embodiment, since the insulating member 3000 having a constant thickness is sandwiched, the gap between the core and the auxiliary core can be set to a desired thickness, and the manufacturing method of the auxiliary core is less likely to cause variations. effect can be obtained.

In addition, since the auxiliary core is directly tightened toward the core of the three-phase tripod transformer, and the arrangement of the rod-shaped member 4000 is determined by the positions of the inner core 100a and the outer core 100b of the three-phase three-phase transformer. , the auxiliary core 1000 can be fixed to the place where it should be arranged.

Further, an auxiliary core holding metal fitting 2000 arranged outside the auxiliary core 1000 so as to sandwich the inner core 100a and the outer core 100b is tightened by a rod-shaped member 4000 and a nut 5000, and the auxiliary core 1000, the inner core 100a and the outer core 100b are tightened. gap can be reduced. As a result, the leakage flux can be reduced, and the efficiency of the transformer as a whole can be improved.

A modification of the auxiliary core retainer 2000 will be described. On the right side of FIG. 15, a bent portion is provided at the lower portion of the auxiliary core retainer 2000, and the tip of the bent portion is bent toward the inner core 100a side. With this structure, even if some of the core pieces of the auxiliary core 1000 fall off due to a decrease in the tightening force between the rod-shaped member 4000 and the nut 5000, the core pieces are prevented from falling onto the winding 200. can be prevented. The bent portion is preferably bent so as to follow the shape of the auxiliary core 1000 .

If the bent portion is not provided, the auxiliary core retainer 2000 may have a shape that follows the side surface of the auxiliary core 1000 . Although the auxiliary core 1000 extending in the vertical direction is described as a typical example in the drawing, it can also be a triangular auxiliary core shown in FIG. It is preferable that the shape extends in an oblique direction.

Furthermore, since the insulating member 3000 is arranged so as to cover the auxiliary core 1000, a U-shaped bag-shaped region is provided below the auxiliary core 1000 as shown on the right side of FIG. To prevent an electrical connection between the core piece and the winding 200 by allowing the U-shaped bag-shaped region to receive the core piece even if the core piece falls off from the bent portion. can be done.

The end of the upper surface of the auxiliary core retainer 2000 is preferably arranged at the same height as the upper portion of the auxiliary core 1000 or at a position lower than the upper portion. If it protrudes from the upper part of the auxiliary core 1000, it will come into contact with other members, but by adopting this configuration, it is possible to prevent contact with other members.

Next, a modified example of the auxiliary core pressing metal fitting 2000 described in FIG. 15 will be described with reference to FIG. The difference between the auxiliary core retainer fitting 2100 of FIG. 17 and the auxiliary core retainer fitting 2000 of FIG. 16 is whether they have an integrated structure or a separate structure. Since the other configurations are the same, the description is omitted.

Since the auxiliary core retainer 2000 shown in the left perspective view of FIG. 15 has a separated structure, the outer core 100b can be seen between the auxiliary core retainers 2000 from above the three-phase three-phase transformer. On the other hand, the auxiliary iron core retainer 2000 shown in the left perspective view of FIG. 17 has an integral structure, and the portion sandwiching both sides of the iron core of the three-phase tripod transformer is connected to the upper surface of the iron core. It has a shape that hides it. 17. The right side of FIG. 17 shows a cross section taken along the dashed line A in the left side of FIG. This makes it easier to align the holes than with a separate structure. In addition, even if the auxiliary core retainer 2100 rotates around the rod-shaped member 4000, the integrated structure does not rotate more than a predetermined amount because the back side of the upper surface contacts the outer core 100b, compared to the separated structure. Therefore, it is highly convenient. In addition, the rear side of the upper surface of the auxiliary core retainer 2100 can be electrically insulated from the outer core 100b by applying an insulating coating or inserting an insulating member.

Further, even if some member falls, the member can protect the outer core 100b by coming into contact with the auxiliary core retainer 2100. FIG.

Similar to the auxiliary core pressing metal fitting 2000 in FIG. 15, a bent portion may be provided in the lower part of the auxiliary core pressing metal fitting 2100 in FIG. As a result, the core pieces of the auxiliary core 1000 that have fallen off can be held, and the outer core 100b can be protected. It is also possible to provide a U-shaped bag-shaped region with the insulating member 3000 .

The above-described auxiliary core can reduce the leakage magnetic flux, thereby improving the energy saving performance of the transformer, which in turn can save energy in a transformer that operates for a long time, and reduce the environmental load.

1a: Inner wound core 1b: Outer wound core 2a: Low voltage winding 2b: High voltage winding 10: Auxiliary core 11: Plate-like magnetic member 100a: Inner wound core 100b: Outer wound core 200: Winding 1000: Auxiliary core 2000 , 2100: Iron core pressing metal fitting 3000: Insulating member 4000: Rod-shaped member 5000: Nut 6000: Gap

Claims (16)

a first core including a first inner core and a second inner core arranged in two, and an outer core arranged to cover the first inner core and the second inner core;
a coil wound around the first inner core, the second inner core, and the outer core;
a first surface facing the yoke portion of the first iron core, a second surface facing the upper surface of the coil, and a third surface between the first surface and the second surface A second iron core in which plate-shaped magnetic members having are laminated in the circumferential direction of the first iron core,
and
A support member is arranged on a surface of the second core opposite to the first core,
The support member is connected via a member passing through a gap provided between the first inner core, the second inner core and the outer core ,
The coils are a high-voltage coil and a low-voltage coil, and the second iron core is not arranged on the high-voltage electrode lead-out side.
A stationary induction device characterized by: a first core including a first inner core and a second inner core arranged in two, and an outer core arranged to cover the first inner core and the second inner core;
a coil wound around the first inner core, the second inner core, and the outer core;
a first surface facing the yoke portion of the first iron core, a second surface facing the upper surface of the coil, and a third surface between the first surface and the second surface A second iron core in which plate-shaped magnetic members having are laminated in the circumferential direction of the first iron core,
and
The first core is a three-phase tripod wound core,
The second iron core is configured by laminating rectangular plate-shaped magnetic members,
A fixing bracket having a window is arranged in the yoke of the three-phase tripod wound iron core,
The plate-shaped insulating member inserted through the window portion presses and fixes the second core against the yoke portion of the three-phase tripod wound core.
A stationary induction device characterized by: In the stationary induction device according to claim 1,
A stationary induction device, wherein the supporting member and the member passing through the gap are tightened by bolts and nuts. In the stationary induction device according to claim 1,
A member having a higher insulating property than the second iron core is arranged between the supporting member and the second iron core, and the second iron core and the supporting member are electrically insulated. A stationary induction device characterized by In the stationary induction device according to claim 1,
A stationary induction device, wherein a bottom portion of the support member has a portion that is bent so as to follow the bottom surface of the second iron core. In the stationary induction device according to claim 1,
A stationary induction device, wherein an end surface of a side portion of the support member has a portion bent so as to follow a side surface of the second iron core. In the stationary induction device according to claim 1,
A stationary induction device, wherein an end surface of the upper part of the support member is arranged at a position equal to or lower than an upper part of the second iron core. In the stationary induction device according to claim 1 or 2 ,
The first iron core has both a front surface and a rear surface,
A stationary induction device, comprising the second iron cores on the front surface and the back surface. In the stationary induction device according to claim 1 or 2 ,
The second iron core is configured by laminating a plurality of plate-shaped magnetic members,
A stationary induction device, wherein the rolling direction of the plate-shaped magnetic member is substantially vertical. In the stationary induction device according to claim 1 or 2 ,
A stationary induction device, wherein the second iron core is arranged to straddle the yoke of any one of the inner iron cores and the yoke of the outer iron core. In the stationary induction device according to claim 1 or 2 ,
The plate-shaped magnetic material member that constitutes the second iron core,
A static induction device, characterized in that the magnetic legs of the first core are laminated in a direction substantially perpendicular to the longitudinal direction of the magnetic legs. In the stationary induction device according to claim 1 or 2 ,
A stationary induction device, comprising: an insulating member provided in a gap between the second iron core and the first iron core. In the stationary induction device according to claim 1 or 2 ,
The first core is a three-phase tripod wound core,
The second core is located at a position facing the laminated surface of the first inner core, the second inner core, and the outer core, which constitutes the yoke portion of the three-phase tripod wound core. A stationary induction device, characterized in that it is arranged in In the stationary induction device according to claim 2 ,
A stationary induction device, wherein a plurality of said second iron cores are arranged in a horizontal direction and arranged to face a lamination surface of a ribbon-shaped magnetic material of a yoke portion of said first iron core. In the stationary induction device according to claim 2 ,
A stationary induction device, wherein a plurality of said second iron cores are arranged in a yoke portion of a surface from which a low-voltage electrode of said stationary induction device is taken out. In the stationary induction device according to claim 1 or 2 ,
The first iron core and the second iron core are
The first iron core and the second iron core are made of a material selected from oriented silicon steel sheets, iron-based amorphous alloys, and nanocrystalline materials, and are characterized by being the same material or different materials. stationary induction equipment.

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