JPH081329U - Grounding device for transformer core - Google Patents

Abstract

(57) [Summary] [Purpose] A winding is fitted on a winding core formed by winding an amorphous magnetic alloy ribbon, and the yoke portion of the winding core protruding from the winding is covered with an insulator. In this state, the winding core was surely grounded. [Structure] Of the pair of reinforcing frames 17 and 18 arranged on the innermost peripheral surface of the winding iron core 27, the winding iron core 27 is provided on the innermost reinforcing frame 18.
A conductive tape R that is in electrical contact with the inner reinforcing frame 17 of the next layer that is in contact with is attached to the yoke portions e and f of the winding core 27 exposed from the winding 34 including the inner reinforcing frame 17. Is coated with an insulator 39 that prevents the amorphous magnetic alloy ribbon T from peeling off, and one of the ground terminals 41 is attached to the yoke portion e of the wound iron core 27 covered with the insulator 39. The winding core 27, which is inserted through the other side, is supported by a clamp 44 attached to the winding core 27, and the winding core 27 covered with an insulator 39 is attached to the innermost reinforcing frame 18
Including the above, the conductive tape R can be grounded favorably.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a grounding device in a transformer core formed by using an amorphous magnetic alloy ribbon.

[0002]

[Prior art]

 In recent years, the use of amorphous magnetic alloy ribbons (hereinafter simply referred to as magnetic ribbons) as a core material has been gradually increasing in wound iron cores used in stationary induction electric devices such as distribution transformers. This magnetic ribbon is manufactured by ultra-quenching a melt of a magnetic alloy and has an extremely small iron loss and excellent magnetic characteristics. Then, for example, in the case of manufacturing a winding core of a distribution transformer by using the winding core made of the magnetic ribbon, a non-cut type winding core having no joint formed by continuously winding the magnetic ribbon is used. After forming the coiled iron core into a rectangular shape by tightening an iron core tightening band on the outside and performing magnetic field annealing, the winding is wound directly on the leg iron part, or A plurality of unit cores (several tens of sheets) obtained by cutting the magnetic ribbon every one turn are combined to form a unit laminated core, and this unit laminated core is further laminated into a plurality of layers to form a unit laminated block (hereinafter, simply laminated). It is called a block).

In assembling the wound core, the laminated block is wound in a circular shape, and both ends of the unit laminated core are sequentially staggered while being abutted or superposed and joined to each other. Several layers are laminated in the same manner as above to form a wound core of a 1-turn cut system with a predetermined laminated thickness, and then the joint portion such as the butt and the like is positioned on one side of the yoke portion and formed into a rectangular shape and magnetic field annealed. I do. After that, the wound core opens the joint of the yoke section for each laminated block, sequentially inserts each laminated block into the core insertion hole of the winding, and rejoins the joined portion of each laminated block. A one-turn cut type winding core was assembled by winding a tightening band around the outermost circumference of the laminated block.

When a transformer is manufactured by using the wound core manufactured by the uncut method or the one-turn cut method, the core and the lower part of the wound core are wound on the yoke parts. Attach a clamp that fixes the contents of the transformer consisting of windings, then store the contents of the transformer in a case, and attach the content fixing metal fittings provided at both ends of the clamp attached to the upper yoke part of the winding core, After fixing and supporting the support brackets formed on the inner wall surface of the case with fixing bolts, the case was filled with insulating oil to manufacture a transformer for distribution.

Further, although the contents of the transformer are housed in a case, the outer surface of the transformer is normally covered by electricity due to the electrostatic capacity existing between the surface and the ground. Since the potential is fairly high and there is a risk of electric shock when touched or approached by the human body, a ground terminal is provided on the outer surface of the transformer case, and this ground terminal is grounded. To solve the above problems.

[0006]

[Problems to be solved by the device]

 However, in the above transformer, when the wound core that constitutes the inside of the transformer is grounded to the ground terminal provided on the outer surface of the case, the tightening band that is normally wound around the outer circumference of the wound core is tightened on the clamp. Due to this, the electrification of the winding iron core was led to the ground terminal via the fastening band → clamp → contents fixing bracket → case. This is because when the transformer is charged, the high voltage applied to the high-voltage winding causes electrostatic induction in the winding core, which results in charging between the winding core and the clamp, or between the low-voltage winding. This is to prevent the occurrence of a discharge phenomenon that deteriorates or damages the insulating oil and the insulation on the low-voltage winding side.

However, when the wound iron core used for the transformer is formed by winding the magnetic ribbon, the magnetic ribbon has a drawback that it is very thin and has poor rigidity for manufacturing reasons. In addition, if the tightening band is tightened around the outer circumference of the wound core after it is assembled in this state, it is difficult for the wound core to withstand the tightening force. Therefore, despite the annealing, there was a big problem that local mechanical strain was generated or the shape was deformed and the magnetic characteristics of the wound core were impaired.

Further, since the magnetic ribbon is extremely brittle due to annealing as described above, when the winding is wound around the winding iron core, or the winding iron core is disassembled into blocks and assembled into the winding. In addition, when assembling a transformer using the wound core after assembling the wound core, if an external force is applied to the laminated end surface of the wound core, the corners and the stack of the wound core can be easily The end faces of the layers are chipped or peeled off, resulting in fragments of magnetic ribbons. If the debris remains in the winding core insertion hole after the winding core is assembled, it will stray due to the convection of insulating oil during operation of the transformer, and if it penetrates between the winding layers, an interlayer short-circuit will occur. There was a problem of inducing an accident.

As described above, when a transformer is manufactured by using a wound iron core wound with a magnetic ribbon, not only the above-mentioned deterioration of the iron core characteristics but also the manufacturing thereof requires a lot of labor and skill, and It has been difficult to improve the productivity of transformers that effectively utilize the magnetic properties of the ribbon. For this reason, when the magnetic ribbon fragments are separated from the wound core, the wound core itself is completely surrounded by an insulator so that the fragments do not dissipate to the outside. It may be possible to prevent it, but if the wound iron core is surrounded by an insulator, there is a problem that the grounding of the transformer is hindered by the insulator, which cannot be performed well.

In view of the above-mentioned problems, the present invention uses a tightening band by making good electrical connection between the ground terminal and the winding iron core even when the winding iron core is completely surrounded by a thin-walled insulator. The grounding device for the transformer core that not only eliminates the adverse effects caused by this, but also eliminates the phenomenon of the magnetic ribbon, which is the material of the wound core, peeling off, enabling the manufacture of a transformer with excellent core characteristics and mass productivity. The purpose is to provide.

[0011]

[Means for Solving the Problems]

 The present invention uses a magnetic ribbon, for example, a pair of innermost and innermost layers made of silicon steel strip within a range where one turn is not formed on the inner peripheral surface of a circular wound iron core wound by a one-turn cut method. The reinforcing frames are arranged so that their open end sides are interleaved with each other, and the outer reinforcing frame is formed with one turn on the outer peripheral surface. The coiled core is formed into a rectangular shape, and then the coiled core is rectangular-shaped and magnetic field annealed. A thin-walled insulator is wound around the inner core with only the innermost reinforcement frame removed, and a stripping prevention part is provided on the wound core.

Subsequently, the yoke portion side having the joint portion of the winding core is opened so that the shape of the winding core is U-shaped, and then the temporarily removed portion is removed using the opened yoke portion. The innermost reinforcement frame is attached to the outside of the area around the corner with a conductive tape of the same thickness or slightly thicker than the stripping prevention part attached to the core insertion hole of the wound coil. The iron portion is inserted and then the released yoke portion is rejoined to complete the assembly of the wound core.

After that, the yoke portion of the wound core exposed on the axial end face side of the winding is wrapped from the outside with a thin insulator to completely cover the iron core portion. Then, of the covered yoke portions, for example, in the gap of the overlapping portion of the reinforcing frame that reinforces the outer circumference of the wound core at the outer peripheral edge of the yoke portion having the joint portion, for example, a thin ground terminal made of copper is provided. Press in about half of that from the outside of the insulator, bend the part of the terminal exposed from the yoke part into a U shape, and bend the bent part to the coil part of the winding core. After that, the grounding terminal is connected to the reinforcing frame on the outer circumference of the winding core covered with a thin leaf insulator by fixing it to the clamp attached to the winding core using a set screw. The contents of the transformer with terminals are housed in the case, and the metal fixing bracket provided in the clamp part is fixed to the inner wall of the case to form a wound core transformer. Its operation is as follows.

[0014]

[Action]

 According to the present invention, in the innermost reinforcing frame located on the innermost peripheral surface of the wound iron core, the conductive tape attached to the outer side in the vicinity of the corner portion of the inner reinforcing frame of the inner reinforcing frame located on the next layer of the innermost peripheral surface is used. Since it is configured to contact the inner surface of the corner part to make electrical connection, when assembling the winding core, make sure that the straight part of the winding core excluding the corner part between the leg iron part and the yoke part is in advance. Even if a stripping prevention part is provided on the wound core by winding an insulating material including the inner reinforcement frame of the next layer, the stripping prevention part is provided on the innermost reinforcing frame located on the innermost peripheral surface of the winding core. Since a conductive tape that is the same as or slightly thicker than the thickness of the insulator is attached near the corners, the inner reinforcing frame where this conductive tape is located in the next layer is As a result of electrical contact near the corners where there is no peeling prevention part, the peeling around the winding core Even if the blocking portion is present, the innermost reinforcing frame and the winding core is located in the innermost peripheral surface of the wound core can be electrically connected satisfactorily.

Further, even if the yoke portion of the wound core exposed from the winding is covered with a thin insulator, the ground terminal has an outer reinforcing frame provided from the outside of the covered insulator to the outer circumference of the wound core. Since it is press-fitted using the narrow gap that is inevitably generated near the overlapping part of the, and the part exposed from the yoke part is fixed to the clamp by screwing, etc. In addition to good grounding of the innermost reinforcing frame located on the innermost peripheral surface of the winding core, even if the winding core is completely covered with an insulator, the presence of the grounding terminal prevents It is possible to easily guide the electrification to the ground terminal through the winding iron core → the ground terminal → clamp → content fixing metal fitting → case without using the conventional tightening band for tightening the iron core. In addition, since the tightening band for tightening the wound iron core itself is not used, it is possible to surely eliminate the harmful effect of using the tightening band.

[0016]

【Example】

 An example in which the present invention is applied to a one-turn cut type winding core will be described with reference to FIGS. 1 to 20. In FIG. 1, reference numeral 11 is a winding shaft drivingly connected to a winding machine (not shown). A circular winding frame 12 is detachably attached to the winding shaft 11 and the winding frame 12 is rotated so that the amorphous magnetic Each time an alloy ribbon (hereinafter referred to as a magnetic ribbon) T is wound around the winding frame 12 by a cutting device 13, the magnetic ribbon T is cut in a circular shape a predetermined number of times and cut for one turn. A wound iron core element body 14 that is the original form of the iron core is formed. When the wound core body 14 is wound, the single plate of the magnetic ribbon T, which is cut during winding on the winding frame 12, does not fall off from the winding frame 12. A rubber belt (not shown) is wound around the peripheral surface of the wound core element body 14 via a guide roller 15.

The circular wound core element 14 wound in the above-described manner has, for example, an adhesive tape (not shown) attached to the outermost periphery thereof and a winding frame 12 and a winding frame 12 (not shown). Remove from the machine. As shown in FIG. 2, the wound core body 14 removed from the winder is wound on its outer peripheral surface with a thickness larger than that of the magnetic ribbon T, for example, a silicon steel strip slightly over one turn. Then, the overlapping portion is temporarily fixed with an adhesive tape or the like to provide the outer reinforcing frame 16. On the other hand, after removing the winding frame 12 on the inner peripheral surface, as shown in FIG. 2 as well, an inner reinforcing frame 17 having a substantially C-shaped plane (using the opening a) is formed by using a silicon steel strip. It is opposed to the position of the joint b of the iron core body 14. The reinforcing frame 17 is formed into a U shape by molding.), And the innermost reinforcing frame is formed into a ring shape within a range where one turn is not formed. The abutting portion c at the tip is located respectively on the side opposite to the opening portion a of the inner reinforcing frame 17) 18 so as to maintain the circular state of the wound core element body 14.

Next, as shown in FIG. 3, the circular wound core body 14 is pressed by the hydraulic press or the like through the molding plates 19 and 20 simultaneously from the front / rear and left / right directions to extend the length. Transform into a circle. Then, as shown in FIG. 3, the wound core element body 14 is pressed and held in an oval shape, and at a position corresponding to a yoke portion of the wound core, a pair of molding dies 21 and 22 are attached to the dies. The recessed grooves 23 provided in the grooves 21 and 22 are arranged so as to face each other, and in this state, a tapered template 24 having a lower end between the recessed grooves 23 and 23 whose length dimension is slightly shorter than the upper end is formed. , 24 (see FIG. 4) are press-fitted between the recessed grooves 23, 23 by a press, and at the same time, the wound core core element 14 which has been oval-shaped is further pressed by the forming plates 19, 20, and is shown in FIG. So as to form a rectangular shape. After the wound core element body 14 is formed into a rectangular shape, the forming plates 19 and 20 are fixed to each other with tightening bolts (not shown), and the forming holding frame 25 is formed by forming a rectangular frame as shown in FIG. As a result, the wound core element body 14 can be favorably held in a rectangular shape.

Subsequently, as shown in FIG. 4, a heat-resistant electric wire is wound from one leg iron portion d of the wound core element body 14 over the forming and holding frame 25 to thereby excite the magnetic field annealing coil. 26, and then, the wound core element body 14 is placed in an annealing furnace filled with an inert gas, and a constant current is applied to the exciting coil 26, and at the same time, magnetic field annealing is performed at a predetermined heating temperature. After the magnetic field annealing, as shown in FIG. 5, the exciting coil 26 is removed from the wound core element body 14, the forming holding frame 25 is disassembled, and further, the concave plates 23 and 23 of the forming dies 21 and 22 are formed. By removing 24 and removing it from the wound core element body 14 together with the molding dies 21 and 22, the rectangular holding state of the wound core element body 14 is released to form a wound core 27. As described above, when the magnetic field annealing is performed, the wound iron core 27 is shaped so as to maintain the rectangular shape as shown in FIG. 5, and the presence of the inner and outer reinforcing frames 16 to 18 makes it possible to form the rectangular shape well. It becomes possible to retain the state.

Next, only the innermost reinforcing frame 18 having a rectangular shape is temporarily removed from the rectangular shaped wound iron core 27 within a range where one turn is not formed, and in this state, as shown in FIG. In the window of the wound core 27, the second molding dies 28, 29 are arranged on the yoke portion e, f side, and the plate-shaped template 30 is placed between the second molding dies 28, 29. The recessed groove 30a is used for press-fitting to prevent the wound iron core 27 from losing its shape due to an external force. After the winding core 27 is treated by the second molding dies 28 and 29 and the mold plate 30 so as not to lose its shape, as shown in FIG. 6, both sides of the laminated end face in the straight part of the winding core 27 leg iron part d are shown. Then, for example, a room temperature curable adhesive is applied at a plurality of positions in the length direction of the leg iron portion d at a predetermined interval to form the adhesive portion 31. After the adhesive portion 31 is formed, before the adhesive is cured as shown in FIG. 7, the adhesive portion 31 is provided with a length substantially corresponding to the linear length dimension of the leg iron portion d, and is folded in a U shape in the width direction. An adhesive similar to the above is applied to the inside portion of the bent relatively thin insulating paper, and the insulating paper is applied to the reinforcing frame 16 inside and outside almost all the area of the leg iron part d from the vertical direction of the laminated end surface of the leg iron part d. , Including 17 are wrapped so that they can be wrapped together.

For the insulating paper, the adhesive applied to the insulating paper itself and the adhesive already applied to the laminated end face side of the leg iron portion d are well adapted to each other, and the insulating paper should be immovably attached to the leg iron portion d. Can In this way, the laminated iron end surface of the leg iron portion d is not attached to the leg iron portion d of the winding iron core 27, and the magnetic ribbon which is brittle due to the impact from the outside or the impact of the jig or the like on the magnetic ribbon is lost. A peeling-off preventing portion 32 is formed to prevent the peeling-off or peeling-off. The adhesive portion 31 is formed on the leg iron portion d to prevent the peeling prevention portion 32 from moving. Therefore, it is not necessary to provide the adhesive portion 31 on the entire leg iron portion d.

Then, after forming the stripping prevention portion 32 on the leg iron portion d, the second molding dies 28, 29 and the template 30 are removed from the wound iron core 27. Also, of the yoke portions e and f of the winding iron core 27, a thin leaf insulating paper having a length substantially equivalent to the length dimension of the straight portion is also provided on the yoke portion f side having no joint b. As shown in FIG. 8, it is wound around the yoke portion f and temporarily fixed with a tape or the like to form the original shape of the exfoliation prevention portion 32a in the yoke portion f.

As described above, when the stripping prevention portions 32 and 32a are formed on the leg iron portion d and the yoke portion f of the winding iron core 27, the linear portions of the leg iron portion d and the yoke portion f of the winding iron core 27 become It is possible to prevent the laminated end faces from peeling off, and also to enhance the rigidity of the leg iron part d and the leg iron part f together with the presence of the inner and outer reinforcing frames 16 and 17. . In such a state, the temporary fixing of the overlapping portion (the upper end surface of the upper yoke portion e of the winding core 27) of the outer reinforcing frame 16 is temporarily released. In this case, since the reinforcing frame 16 is annealed at the annealing temperature of the magnetic ribbon T which is about half the annealing temperature of itself, the elastic force of the material itself remains so that the reinforcing frame 16 can be easily opened and the wound iron core It can be expanded to a position substantially on the same line as the leg iron part d of 27.

On the other hand, in the wound iron core 27 around which the magnetic ribbon T is wound, the yoke portion e 1 where the joint portion b is located is changed from the rectangular state of FIG. 7 to the leg portion of the yoke portion e as shown in FIG. It is opened to a position substantially on the same line as the iron part d so that the planar shape is U-shaped. The opening operation of the yoke portion e is performed by removing the stripping prevention portions 32 and 32a formed on the leg iron portion d and the yoke portion f of the winding iron core 27, the outer reinforcing frame 16 and the inner reinforcing frame 16 arranged on the outer peripheral surface of the winding iron core 27. The U-shaped inner reinforcing frame 17 arranged on the peripheral surface of the wound iron core 27 maintains sufficient rigidity, so that the wound iron core 27 can be smoothly and satisfactorily prevented from being deformed by its own weight or deformed. It can be opened in a U shape.

On the other hand, as shown in FIG. 8, the winding 34 incorporated in the winding iron core 27 is provided with the innermost reinforcing frame 18 removed when the peeling prevention portion 32 is formed on the leg iron portion d of the winding iron core 27. As shown in FIG. 8, the iron core is inserted into the innermost side of the insertion hole 35 in a rectangular shape. Further, as shown in FIG. 13, for example, the innermost reinforcing frame 18 is formed with a plurality of protrusions P in the vicinity of the corner portions at the four corners so as to project toward the outer peripheral surface. The protrusion P is removed by removing the innermost reinforcing frame 18 when the peeling prevention portion 32 is formed on the leg iron portion d of the winding iron core 27, and then is formed by using a simple press or a punch, or the innermost reinforcing portion is formed. It is preferable to form the frame 18 in a flat plate shape before being rectangularly formed. Further, as shown in FIG. 8, when the winding iron core 27 is provided with the stripping prevention portions 32 and 32a, the position where the projection P is provided is covered with an insulator existing between the stripping prevention portions 32 and 32a. It is formed at a position corresponding to the vicinity of the inner corner of the unwound iron core 27. The protrusion length of the protrusion P is formed to be slightly longer than the thickness of the exfoliation preventing portions 32, 32a.

In addition, an example in which the innermost reinforcing frame 18 is provided with the protrusions P that are electrically connected to the inner reinforcing frame 17 in the vicinity of the respective corners has been described. As shown in FIG. 20, as the electrical connection means similar to the projection P, a conductive tape R having the same thickness as or slightly thicker than the peeling prevention portions 32, 32a is provided on both sides of the corner portion outside the innermost reinforcing frame 18. Stick again. Of course, the conductive tape R may be used to electrically connect the innermost reinforcing frame 18 and the inner reinforcing frame 17 located in the next layer in the same manner as the protrusion P near the corners. is there.

As described above, the innermost reinforcing frame 18 having the projection P or the conductive tape in the vicinity of the corner is inscribed in the iron core insertion hole 35 of the winding wire 34 and opened in the U-shape. As shown in FIG. 8, the winding iron core 27 is arranged such that the joint portion b of the opened yoke portion e faces the iron core insertion hole 35 of the winding wire 34 and the joining portion of the winding iron core 27 to the iron core insertion hole 35 of the winding wire 34. When the winding core 27 is inserted from the side of the yoke portion e, the peeling prevention portion 32 of the winding iron core 27 slides on the innermost reinforcing frame 18 to make the winding 34 move from the yoke portion e to the leg iron portion d in about one operation. Can be incorporated.

As shown in FIG. 9, the winding core 27 opened in the U shape is fitted into the winding 34, and then, on the outer surface of the innermost reinforcing frame 18 located on the open end side of the winding core 27, The insulating paper 18a surrounding the linear portion of the yoke portion e of the winding iron core 27 is attached, and the space between the axial end portion of the winding wire 34 and the innermost reinforcing frame 18 is shown in FIG. As described above, the spacers 36 and 37 made of an insulating material are inserted, and then the yoke portion e of the opened wound iron core 27 is sequentially bent from the innermost layer portion to the state before the opening (inner side), and the opening is performed. The pieces g are joined together to form the joint b again, as shown in FIG.

Then, the free end of the outer reinforcing frame 16 arranged on the outer periphery of the wound iron core 27 is superposed on the outer peripheral surface of the yoke portion e where the joint b is located, and the end of this portion is spot-welded or the like. After fixing, the adhesive is appropriately applied to the laminated end surface side of the yoke portion e to attach the insulating paper 18a from the laminated end surface of the yoke portion e toward the outer peripheral side thereof as shown in FIG. Thus, the peeling-off preventing portion 32b is formed. The thin insulating paper temporarily fixed to the other yoke portion f side of the winding iron core 27 is also coated with an adhesive agent and attached to the laminated end surface of the yoke portion f in the same manner as described above to form the peeling prevention portion 32a. By doing so, as shown in FIGS. 11 and 12, the assembling work of the winding core 27 to the winding 34 is completed. After fixing the overlapping portion of the outer reinforcing portion 16 and forming the peeling prevention portions 32a and 32b, the wedge 38 is press-fitted into the gap between the spacer 36 and the innermost reinforcing frame 18 and wound. The wire 34 is fixed in the window of the winding core 27.

When the winding iron core is assembled as described above, the innermost reinforcing frame 18 located in the innermost layer of the winding iron core 27, which plays a role of reinforcing the yoke portion e side of the winding iron core 27, and the outside thereof. The relationship with the inner reinforcement frame 17 of the next layer located at the position is that the leg iron portion d of the winding iron core 27 and the stripping prevention portions 32, 32a, 32b provided by winding an insulator around the yoke portions e, f. Due to the presence of the inner reinforcement frame 17 of the next layer, the innermost reinforcement frame 18 has four corners, the winding core 27 corresponding to the corners, and the inner reinforcement frame 17 of the next layer, as shown in FIG. A minute gap s ₁ is formed between the corner portion of the inner wall and the corner of the inner wall of the inner reinforcement frame 17 by the thickness of the peeling prevention portions 32, 32a, 32b. On the other hand, the portions of the innermost reinforcing frame 18 corresponding to the leg portions d of the winding iron core 27 and the straight portions of the yoke portions e and f are detachment preventing portions 32 and 32a made of an insulator with respect to the winding iron core 27. , 32b, so that they cannot come into direct contact with the wound iron core 27.

As a result, only the innermost reinforcing frame 18 cannot directly contact the wound iron core 27. However, in the present invention, as shown in FIG. A plurality of protrusions P or conductive tapes R projecting toward the gap s ₁ are formed, and when these protrusions P or conductive tapes R have finished assembly of the winding core 27, As shown in the enlarged cross-sectional view of No. 14 (Example of the protrusion P), the inner reinforcement of the next layer is provided at a portion where the exfoliation prevention portions 32, 32a, and 32b do not exist (in the vicinity of the inner corner portion of the wound iron core 27). Since it comes into direct electrical contact with the frame 17, the problem that only the innermost reinforcing frame 18 cannot be grounded is reliably solved.

Further, when the outer reinforcing frame 16 is fastened by stacking the free ends thereof on each other on the outer peripheral surface of the yoke portion e having the joint portion b of the winding iron core 27, as shown in FIG. It is possible to form a narrow gap s between the edge of the overlapping portion r and the upper end surface of the yoke portion e.

As described above, after the winding iron core 27 is inserted into the winding wire 34 as shown in FIG. 12 to assemble, the whole area of the yoke portions e and f of the winding iron core 27 is covered with a thin leaf insulating material 39. Wrap and cover as shown in FIG. The thin leaf insulator 39 is excellent in heat resistance and flexibility so that it can be well wrapped around the yoke portions e and f of the winding iron core 27 having an arcuate portion, and is also excellent in insulation. A non-woven fabric made of synthetic fibers with high porosity that is well adapted to oil is used.

When wrapping the thin-walled insulator 39, the insulator 39 is preliminarily formed into a rectangular shape in such an area that the laminated end faces and the outer peripheral edges of the respective yoke portions e and f can be integrally wrapped. Then, the cut insulator 39 is bent into a U shape while being applied to the outer peripheral surface of the yoke portion e, and the bent piece is brought into contact with the yoke portion e side, and the yoke portion is cut. As shown in FIG. 15, the portion protruding to the outer peripheral edge side is bent from the laminated end face side of the yoke portion e toward the outer peripheral edge side, and the bent portion is provided on the outer peripheral edge of the wound iron core 27 with an adhesive tape. The yoke portion e is completely covered with the thin leaf insulating material 39 by, for example, attaching.

When the covering of the yoke portion e with the insulator 39 is completed, the other yoke portion f is also coated with the insulator 39 in the same manner as described above. When the insulator 39 is coated on the yoke portions e and f, an adhesive or the like is appropriately applied to the laminated end surfaces of the yoke portions e and f in advance, and then the wrapping operation is started, whereby the insulator It is possible to smoothly and satisfactorily cover the 39 yoke portions e and f. Further, after the insulator 39 is wrapped, an insulating varnish or the like may be applied from above the insulator 39 to prevent the insulator 39 covering the yoke portions e and f from coming off.

After covering the yoke portions e and f of the wound iron core 27 with a thin insulating material 39, an adhesive is applied to the outer peripheral surface of the wound iron core 27 in a semi-cured state, as shown in FIG. The adhesive insulating paper 40 is wound around the iron core insertion hole 35 of the winding wire 34 to prevent the bent portion of the thin insulating material 39 from peeling outward. Thereafter, a thick guide plate (not shown) such as a press board is provided outside the adhesive insulating paper 40 in a small gap (not shown) existing between the outside of the leg iron portion d of the winding iron core 27 and the winding 34. Is press-fitted in the center position of the winding iron core 27 in the width direction. As a result, the winding 34 can be fixed to the winding iron core 27 by the guide plate, spacers 36, 37, and wedge 38 (not shown) without swinging.

As described above, the wound iron core 27 includes the reinforcing frames 16, 17, 18 arranged on the outer peripheral surface thereof, and the fall prevention member formed by winding around the straight portions of the leg iron portion d and the yoke portions e, f. The portions 32, 32a and 32b and the thin-walled insulator 39 attached to the yoke portions e and f so as to surround them further strengthen the rigidity and prevent peeling, so that impact by external force is exerted. It is possible to reliably prevent the wound iron core 27 from being deformed by its own weight due to vibration, vibration, or the like, and the fragments of the magnetic ribbon T from being scattered to the outside.

Next, the gap s formed between the overlapping edge r of the outer reinforcing frame 16 and the upper end surface of the yoke portion e of the outer reinforcing frame 16 arranged on the outer peripheral surface of the winding iron core 27 on the side of the upper yoke portion e. Then, as shown in FIG. 16, the ground terminal 41 is pressed through the insulator 39 by a length of about 1/3. After the ground terminal 41 is press-fitted, an adhesive or the like is applied to the damaged portion of the insulator 39 to prevent the fragments of the magnetic ribbon T from scattering outside from the damaged portion. After that, as shown in FIG. 17, the ground terminal 41 press-fitted into the gap s of the outer reinforcing frame 16 has a portion projecting to the surface of the yoke portion e of the winding core 27 fixed on the thin-walled insulator 39. In the state where the horizontal protruding portion o of the length is left, it is bent in a U shape in parallel with the yoke portion e side to form an engaging portion t with a clamp to be described later.

After press-fitting the ground terminal 41, as shown in FIG. 18, the winding iron core 27 incorporated in the winding wire 34 is raised, and in this state, a plate-like winding made of an insulator is formed on the laminated end surface of the winding iron core 27. The wire retainer 42 is applied so as to abut on the upper and lower end surfaces of the winding 34 in the axial direction. In this case, as shown in FIG. 18, the winding retainer 42 is formed such that its height is slightly higher than the outer peripheral surfaces of the yoke portions e and f of the winding iron core 27, and the ground terminal Reference numeral 41 denotes a U-shaped engaging portion t located outside the winding retainer 42 by engaging a protruding portion o with a notch hole 43 notched at a position where the ground terminal 41 of the winding retainer 42 protrudes. Is formed.

When the above-mentioned clamp is attached to the winding iron core 27, the upper clamp 44 and the lower clamp 45, which are wider than the width dimension of the winding iron core 27 and are formed into a U-shape, are respectively attached to the yoke portions of the winding iron core 27. As shown in FIG. 19, play is made from the vertical direction of e and f. In this case, since the ground terminal 41 is provided with the U-shaped engaging portion t, when the upper clamp 44 is loosely engaged, one of the bent pieces is favorably engaged with the engaging portion t of the ground terminal 41. Can be installed. Further, in the upper and lower clamps 44 and 45, since the winding presser 42 is formed with a length protruding from the outer peripheral surface of the winding iron core 27, a constant space is provided with respect to the outer peripheral surface of the winding iron core 27. It becomes possible to play and hold it while keeping it floating.

After the upper and lower clamps 44 and 45 are loosely fitted to the winding iron core 27, as shown in FIG. 19, a clamp tightening band 46 is drilled from the lower side of the lower clamp 45 to the lower clamp 45. It is inserted through the hole 47 and vertically penetrates the gap formed by a guide plate (not shown) press-fitted into the leg iron portion d of the winding iron core 27 between the winding wire 34 and the through hole of the upper clamp 44. The upper and lower clamps 44 and 45 are projected onto the winding iron core 27 from above 47 and fastened on the upper clamp 44, so that the upper and lower clamps 44 and 45 are attached to the winding band 34 and the tightening band 46 through the winding retainer 42. Firmly fixed and supported. As a result, the wound iron core 27 can be held on the winding 34 in a non-pivotable manner without any mechanical stress due to the attachment of the upper and lower clamps 44 and 45 due to the interposition of the winding retainer 42.

After the upper and lower clamps 44 and 45 are attached, the free end of the engaging portion t 1 of the ground terminal 41 is fixed to the bent portion of the upper clamp 44 by using the set screw 50 to transform the transformer. The assembly of the container contents 51 is completed. As a result, in the ground terminal 41, even if the yoke portions e and f protruding from the winding 34 of the winding iron core 27 are entirely covered with the thin leaf insulator 39, the innermost reinforcing frame 18 However, even if an insulator partially intervenes between it and the reinforcing frame 17 of the next layer, the entire wound iron core 27 and the upper clamp 44 can be connected to each other so that they can be accurately grounded.

As shown in FIG. 19, the transformer contents 51 configured as described above have the contents fixing metal fittings 52 attached to both ends of the upper clamp 44 in the longitudinal direction on the inner wall portion of the case (not shown). By tightening the formed seat with the tightening bolt, the transformer contents 51 housed in the case can be securely fixed to the case. Therefore, the electrification of the winding iron core 27 that occurs during the operation of the transformer is properly guided to the ground terminal 41 crimped to the winding iron core 27 → the upper clamp 44 → the content fixing metal fitting 52 → the case → the earth terminal provided on the case. It can be flushed to the ground.

As described above, according to the present invention, the innermost reinforcing frame 18 of the winding iron core 27 and the inner reinforcing frame 17 that is in direct contact with the winding iron core 27 are separated from each other at the corners corresponding to each other by peeling off the insulating material. Since the projections P formed corresponding to the wall thickness of the blocking portion 32 or the conductive tape R are attached, the reinforcing frames 17 and 18 are electrically connected to each other. When the conductive tape R is affixed, the workability is much simpler than in the case where the protrusion P is affixed, and in addition, in the corner portion of the innermost reinforcing frame 18, although minute gap s ₁ by the thickness of the exfoliation preventing portion 32 is caused by the affixed to Rukoto the conductive tape R as the gap s ₁ is the fully because it is possible to fill in a state close While the transformer is in operation, Transformer is vibrated by a gap s ₁ is present, since attained to resolve the problem of generating noise is convenient.

[0045]

[Effect of device]

 According to the present invention, when a one-turn cut type winding core is incorporated into a winding, the material of the winding core is an amorphous magnetic alloy ribbon having a thickness of about 1/10 that of a silicon steel strip. As a result, the winding core itself is opened in a U-shape and inserted into the winding by using the joint of the winding core. Therefore, the winding core maintains its rigidity on its inner and outer peripheral surfaces. The U-shaped inner and outer reinforcing frames are integrally provided by winding the insulating member in the straight portions of the leg iron portion and the yoke portion. On the other hand, on the winding side, when the yoke members of the open wound iron core are rejoined, the innermost reinforcing frame for reinforcing the part is arranged in advance. When assembled, the innermost reinforcement frame located on the winding side and the inner reinforcement frame located on the winding core side have electrical insulation between the inner reinforcement frame and the inner reinforcement frame. In the space between the innermost reinforcing frame and the inner reinforcing frame, partial discharge occurs during operation of the transformer, which causes abnormal noise and deterioration and damage of winding insulation. There is a risk. However, in the present invention, a conductive tape filling the above-mentioned space is attached near the corner of the innermost reinforcing frame where the insulating member is not interposed, and this conductive tape serves as the innermost reinforcing frame. Since it is configured to be electrically connected to the inner reinforcing frame, the innermost reinforcing frame can be reliably grounded to the wound core. Therefore, as described above, partial discharge does not occur inside the wound core, and no adverse effects due to partial discharge occur, and it is possible to provide a transformer core having excellent core characteristics.

Moreover, according to the present invention, the conductive tape can be attached to either one of the innermost and innermost reinforcing frames to electrically connect both members. It is possible to quickly and surely provide the electrical connecting means with the conductive tape.

In addition, the present invention employs a structure in which the yoke portion covered with a thin-walled insulator is pierced with the insulator to directly contact the ground terminal itself with the wound iron core. As described above, in combination with the point that the innermost reinforcing frame of the winding core is properly grounded to the winding core, the winding core whose outer surface is covered with the insulator can be grounded smoothly and satisfactorily.

[Brief description of drawings]

FIG. 1 is a schematic view showing a winding state of an amorphous magnetic alloy ribbon.

FIG. 2 is a plan view of a wound core element body wound in a circular shape.

FIG. 3 is an explanatory diagram showing a process of forming a wound core element body.

FIG. 4 is an explanatory view showing a state where a wound core element body is rectangularly formed and an annealing treatment is performed.

FIG. 5 is a plan view of a wound iron core that is annealed and shaped into a rectangular shape.

FIG. 6 is an explanatory view showing a process of forming an insulating reinforcing portion formed on a leg iron portion of a wound iron core.

FIG. 7 is a plan view of a wound iron core in which an insulation reinforcing portion is formed on a leg iron portion.

FIG. 8 is an explanatory view showing a case where a winding is incorporated into a wound iron core opened in a U shape.

FIG. 9 is an explanatory view showing a state in which a winding is inserted in a wound iron core opened in a U shape.

FIG. 10 is an explanatory view showing a state in which the wound core is being assembled.

FIG. 11 is an explanatory diagram showing a state in which a winding is incorporated in a wound core.

FIG. 12 is a perspective view showing a state where the wound core is completely assembled.

FIG. 13 is a perspective view of an innermost reinforcing frame.

FIG. 14 is an enlarged cross-sectional view of a main part of a wound iron core.

FIG. 15 is an explanatory diagram showing a state in which the entire area of a yoke portion of a wound iron core incorporated in a winding wire is covered.

FIG. 16 is an exploded perspective view showing a state in which a grounding terminal of the present invention is attached to a wound iron core.

FIG. 17 is a perspective view of a wound core showing a mounting state of a ground terminal according to the present invention.

FIG. 18 is a perspective view showing an assembling process of the wound core transformer.

FIG. 19 is a perspective view of a wound core transformer showing a mounting state of a ground terminal according to the present invention.

FIG. 20 is a perspective view showing a second embodiment of the innermost reinforcing frame.

[Explanation of symbols]

16 Outer Reinforcement Frame 17 Inner Reinforcement Frame 18 Innermost Reinforcement Frame 18a Insulating Paper 27 Winding Iron Core 32 Detachment Blocking Part 32a Detachment Blocking Part 32b Detachment Blocking Part 34 Winding 39 Insulation 41 Grounding Terminal 44 Upper Clamp 45 Lower Clamp 46 Tightening Band 50 Set screw b Joint part d Leg iron part e Yoke iron part f Yoke iron part P Protrusion s Gap s ₁ Gap R Conductive tape

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H01F 27/24 Z

Claims (1)

[Scope of utility model registration request] 1. A transformer in which a winding is fitted to a wound iron core formed by winding an amorphous magnetic alloy ribbon a predetermined number of times,
In the innermost layer of the wound iron core, a pair of innermost reinforcing frame and inner reinforcing frame made of a silicon steel strip are arranged in a range that does not form one turn, and the openings of the innermost reinforcing frame and the inner reinforcing frame are arranged to be different from each other. An insulating material is wound around the frame and the linear portion of the leg iron portion excluding the corner portion of the winding core to form a stripping prevention portion, and the inner reinforcement frame and the innermost reinforcement frame in which the stripping prevention portion does not exist correspond to each other. In the vicinity of the corner, attach a conductive tape to either or both of the innermost reinforcing frame and the inner reinforcing frame,
The conductive tape electrically connects the innermost reinforcing frame and the inner reinforcing frame to connect the innermost reinforcing frame and the winding core so that they can be grounded, and is exposed from the winding portion of the winding core. The part that is covered with a thin insulator is pressed, one end of the ground terminal is press-fitted into the wound iron core covered with this insulator, and the free end that is the other end of this ground terminal is attached to the yoke part of the wound iron core. A grounding device for a transformer iron core, which is fixed to a clamp.