JP6803726B2 - Rest guidance device - Google Patents

Description

Embodiments of the present invention relate to stationary induction devices.

In a static induction device, for example, a mold transformer for high-voltage power receiving and distribution equipment, a mold coil is mounted on an iron core. At this time, a coil presser foot is attached to the clamp that fixes the upper yoke portion or the upper yoke portion of the iron core, and the coil presser foot is used in the axial direction of the coil via the coil presser insulator (spacer) forming a thick plate block. A configuration is adopted in which the end face is pressed and supported (see, for example, Patent Documents 1 and 2).

Jikkai Sho 58-173223 Jikkai Sho 56-108221

In a transformer as described above, when the voltage class of the coil or the test voltage becomes high, it is necessary to strengthen the insulation between the coil and the coil holding metal. Specifically, the coil presser insulator is enlarged in the height direction to increase the creepage separation distance between the coil and the coil presser metal, and the like is strengthened. However, this has a problem that the entire transformer becomes large in the height direction.

Therefore, we provide a static induction device that can strengthen the insulation between the coil and the coil retainer, but can suppress the overall increase in size.

The stationary induction device according to the embodiment includes an iron core fixed to the fixed portion, a coil mounted on the iron core, and a coil pressing metal fitting for pressing the axial end surface of the coil against the fixed portion or the iron core. A coil presser foot insulator made of an insulating material interposed between the coil presser foot and the end surface of the coil is provided, and the coil presser foot is applied to the presser surface of the coil presser insulator to press the coil presser foot. has a pressing plate portion forming a plate shape, the presser surface of the coil pressing insulator, said has the pressing plate portion of the coil pressing hardware is a recess can be arranged housing, the pressing plate portion It is arranged in the recess, and the depth dimension of the recess is larger than the thickness dimension of the holding plate portion .

The front view which shows the 1st Embodiment and shows schematicly about the whole structure of a transformer. Perspective view of the coil retainer insulator at the upper end of the coil Longitudinal side view of the coil retainer insulator at the upper end of the coil The second embodiment is shown, and is a vertical sectional side view of a coil holding insulation part. The third embodiment is shown, and is the perspective view of the coil holding insulation part.

Hereinafter, some embodiments applied to the molded transformer for high voltage power receiving and distribution equipment will be described with reference to the drawings. In the description of the plurality of embodiments, substantially the same constituent parts are designated by the same reference numerals, and the description thereof will be omitted.

(1) First Embodiment The first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 schematically shows the overall configuration of the transformer 1 as a static induction device according to the present embodiment. The transformer 1 includes an iron core 2 and, in this case, three coils 3 mounted on the iron core 2. The coil 3 is composed of a molded coil. The iron core 2 is configured to include three leg portions 6 extending in the vertical direction and connected to the upper yoke portion 4 extending in the left-right direction and the lower yoke portion 5 in FIG. The coil 3 is wound around each leg portion 6.

The iron core 2 is formed by laminating a plurality of thin metal plates made of, for example, a silicon steel plate, and the yoke portion 4 is fastened and fixed by an upper clamp 7 as a fixing portion made of, for example, a steel material. Similarly, the lower yoke portion 5 is tightened and fixed by the lower clamp 8 as a fixing portion. Further, the lower yoke portion 5 and the lower clamp 8 are fixedly arranged on the pedestal 9. The iron core 2, the upper and lower clamps 7, 8 and the pedestal 9 are connected to the ground potential.

At this time, the upper end surface of the coil 3 is pressed downward against the upper clamp 7 (upper yoke portion 4) between the upper end surface which is the axial end surface of each coil 3 and the upper clamp 7. For this purpose, a coil presser foot 11 made of metal, for example, a steel material, and a coil presser insulator 12 made of an insulating material, for example, plastic, are provided. Although not shown in detail, the coil presser foot 11 and the coil presser insulator 12 are provided so that three sets are substantially rotationally symmetric with respect to the upper surface portion of one coil 3 at intervals of 120 degrees.

Further, similarly, the lower end surface of the coil 3 is pressed upward (received and supported) against the lower clamp 8 (lower yoke portion 5) between the lower end surface of each coil 3 and the lower clamp 8. The coil presser foot 13 and the coil presser insulator 14 are provided. The coil presser foot 13 and the coil presser insulator 14 are also provided with three sets for one coil 3, and are arranged substantially symmetrically vertically with the coil presser metal 11 and the coil presser insulator 12.

Hereinafter, the configurations of the upper coil presser foot 11 and the coil presser insulator 12 will be described in detail with reference to FIGS. 2 and 3 as representatives thereof. That is, as shown in FIGS. 2 and 3, the coil presser foot 11 integrally includes a rectangular plate-shaped presser plate portion 11a and a bolt portion 15 extending upward from the center of the upper surface of the presser plate portion 11a. Have in. A mounting bracket 16 for supporting the coil pressing metal fitting 11 (bolt portion 15) is fixed to the upper clamp 7 by welding or the like. The mounting bracket 16 has an L-shaped side surface bent shape, and an insertion hole 16a (see FIG. 3) through which the bolt portion 15 can be inserted vertically is formed in a portion extending in the horizontal direction thereof. ..

The coil presser foot 11 is in a state in which the bolt portion 15 is inserted into the insertion hole 16a from below, and the mounting bracket 16 is sandwiched from above and below by the two nuts 17 and 17 screwed into the bolt portion 15. Has been done. At this time, the two nuts 17 and 17 are screwed back and forth with respect to the bolt portion 15 to change the vertical position, so that the position of the coil presser foot 11 with respect to the mounting bracket 16 in the vertical direction (downward pressing force). Can be adjusted.

On the other hand, the coil presser insulator 12 is made of a synthetic resin, for example, a polyester resin, and is formed in a rectangular parallelepiped block shape as a whole. At this time, the vertical and horizontal dimensions of the upper surface of the coil presser insulator 12 are larger than the presser plate portion 11a of the coil presser metal piece 11, and in the present embodiment, the upper surface portion of the coil presser insulator 12 has a coil. A rectangular recess 18 is formed in which the presser plate portion 11a of the presser foot 11 can be arranged and accommodated. Further, the depth dimension of the recess 18 is configured to be larger than the thickness dimension of the pressing plate portion 11a. Further, in the present embodiment, the coil presser insulator 12 is located at two upper and lower positions, and a thin flange-shaped fold portion 19 is integrated so as to extend horizontally from the entire outer peripheral surface (four side surfaces). It is provided as a target.

The coil pressing insulators 12 having the above configuration are arranged at three locations so as to be rotationally symmetric at intervals of 120 degrees while keeping the longitudinal direction along the radial direction of the upper surface of the coil 3 when viewed from above. Then, in that state, the coil presser foot 11 presses the upper clamp 7 downward, that is, against the upper end surface of the coil 3, and holds the coil 3. At this time, the holding plate portion 11a of the coil holding metal 11 is arranged in the recess 18 so as to press the bottom surface of the recess 18 downward.

Although detailed description will be omitted, the coil presser foot 13 and the coil presser insulator 14 also have a configuration substantially equivalent (vertically symmetrical) to the coil presser foot 11 and the coil presser insulator 12. .. Although not shown, the transformer 1 having the above configuration is used by being housed in a tank filled with an insulating cooling medium such as insulating oil or insulating gas.

In the transformer 1 having the above configuration, the coil holding insulator 12 interposed between the coil holding metal 11 and the upper end surface of the coil 3 serves as an insulating spacer, and insulation between them is achieved. At this time, the coil pressing insulator 12 is formed with a recess 18, and the coil pressing metal 11 is arranged in the recess 18. As a result, the bar rear effect in creeping discharge between the coil 3 and the coil holding metal 11 can be expected by the amount corresponding to the depth of the recess 18, and the insulation can be strengthened by that amount. Moreover, the entire coil presser insulator 12 can be made large in the height direction without increasing the size.

Therefore, according to the transformer 1 of the present embodiment, it is possible to obtain an excellent effect that the overall size can be suppressed while the insulation between the coil 3 and the coil holding metal 11 can be strengthened. Can be done. Further, in particular, in the present embodiment, the folds 19 are provided on the outer peripheral surface of the coil pressing insulator 12. With the folds 19, the creepage insulation distance between the coil 3 and the coil retainer 11 can be made larger, and the insulation performance can be further improved without inviting an increase in size in the height direction.

Incidentally, the present inventor conducted a lightning impulse test and an AC withstand voltage test on the transformer 1 of the present embodiment. As a result, it was clarified that the occurrence of partial discharge between the coil holding metal 11 and the coil 3 can be sufficiently suppressed. As a result, it is possible to prevent the partial discharge from progressing and leading to the destruction of the entire road, and by extension, it is possible to increase the withstand voltage of the transformer 1.

(2) Second, Third Embodiment, Other Embodiments FIG. 4 shows the second embodiment, and the difference from the first embodiment is the configuration of the coil pressing insulator 21. is there. That is, the coil pressing insulator 21 is made of an insulating material such as a synthetic resin in a rectangular parallelepiped shape, and folds 22 are provided on the outer peripheral surface thereof. The upper surface of the coil presser insulator 21 is flat, and the size of the upper surface of the coil presser insulator 22 is larger than that of the presser plate portion 11a of the coil presser metal piece 11. The presser plate portion 11a of the coil presser foot 11 is addressed to the upper surface of the coil presser insulator 12 and presses the coil insulator 21 downward.

In the present embodiment, an insulating seal member 23 is provided on the upper surface of the coil presser insulator 21 to cover the periphery of the presser plate portion 11a, which is a portion of the coil presser metal piece 11 that presses the coil presser insulator 21. There is. The insulating seal member 23 is made of, for example, a room temperature curable silicone rubber compound, is applied to the circumference of the presser plate portion 11a addressed to the coil presser insulator 21 of 1, and then cured at room temperature. The coil presser insulator 21 is provided in a rectangular frame shape that surrounds the entire circumference of the presser plate portion 11a so as to continuously rise from the upper surface. The insulating seal member 23 may also be applied to the upper surface side of the holding plate portion 11a.

In the above configuration, since the periphery of the presser plate portion 11a of the coil presser foot 11 is covered with the insulating seal portion 23 material, the electric field between the coil 3 and the coil presser foot 11 can be relaxed and insulated. Can be strengthened. The coil retainer insulator 21 does not become large in the height direction. Therefore, even with this second embodiment, it is possible to obtain an excellent effect that the overall size can be suppressed while the insulation between the coil 3 and the coil holding metal 11 can be strengthened. .. Further, since the folds 22 are provided on the outer peripheral surface of the coil pressing insulator 21, the insulation performance can be further improved.

FIG. 5 shows a third embodiment, and the difference from the first embodiment is in the configuration of the coil pressing insulator 31. The coil presser insulator 31 is made of an insulating material such as polyester resin in a rectangular parallelepiped shape as a whole, and has a rectangular shape on which a presser plate portion 11a of the coil presser metal 11 can be arranged and accommodated. The recess 32 of is formed. Then, in the present embodiment, there are no folds, and the four side surfaces of the outer circumference of the coil holding insulator 31 are flat.

Even in such a coil pressing insulator 31, by providing a recess 32 in which the pressing plate portion 11a of the coil pressing metal 11 is arranged, the coil 3 and the coil pressing metal 11 are provided in the same manner as in each of the above embodiments. It is possible to obtain an excellent effect that the overall size can be suppressed while the insulation between the two can be strengthened. Since it is not necessary to provide folds, the structure of the coil presser insulator 31 is simplified by that amount, and it can be manufactured at low cost.

Although not described in detail in the above embodiment, the coil presser insulator (insulation spacer) at the lower part of the coil 3 is provided by using a coil presser metal having a bolt portion or a mounting bracket as in the upper part. You may. Alternatively, the coil presser insulator may be installed on the lower clamp in a mounted manner without using a coil presser metal or the like, and the lower end surface of the coil may be received on the upper surface thereof. In each of the above embodiments, a three-phase transformer has been described as an example, but the present invention is not limited to this, and a single-phase transformer may be used. The static induction device is not limited to a transformer, and can be applied to, for example, a reactor.

In addition, various changes can be made to the shape and mounting structure of the coil presser foot, and also to the material, shape, and structure of the coil presser insulator. Some of the embodiments described above are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

In the drawing, 1 is a transformer, 2 is an iron core, 3 is a coil, 7 is an upper clamp (fixed part), 11 and 13 are coil presser fittings, 11a is a presser plate portion, and 12, 14, 21 and 31 are coil presser insulation. Objects, 18 and 32 are recesses, 19 and 22 are folds, and 23 is an insulating seal member.

Claims (3)

The iron core fixed to the fixed part and
With the coil attached to the iron core,
A coil presser foot for pressing the axial end face of the coil against the fixed portion or the iron core, and
A coil retainer insulator made of an insulating material interposed between the coil retainer and the end face of the coil is provided.
The coil presser foot has a plate-shaped presser plate portion that is addressed to the presser surface of the coil presser insulator and presses the coil presser.
The presser surface of the coil pressing insulator, said has the pressing plate portion of the coil pressing hardware is a recess can be placed accommodated, together with the pressing plate portion is arranged in the recess,
A resting guidance device in which the depth dimension of the recess is larger than the thickness dimension of the holding plate portion . The iron core fixed to the fixed part and
With the coil attached to the iron core,
A coil presser foot for pressing the axial end face of the coil against the fixed portion or the iron core, and
A coil retainer insulator made of an insulating material interposed between the coil retainer and the end face of the coil is provided .
The coil presser foot has a plate-shaped presser plate portion that is addressed to the presser surface of the coil presser insulator and presses the coil presser.
On the presser surface of the coil presser insulator , an insulating seal member covering the periphery of the presser plate portion of the coil presser metal material continuously rises from the presser surface, and the entire circumference of the presser plate portion is covered. A stationary guidance device provided in a frame shape that surrounds it . The stationary induction device according to claim 1 or 2, wherein folds are provided on the outer peripheral surface of the coil presser insulator.

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