JPH0745939Y2 - Transformer ground terminal attachment device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for mounting a ground terminal in a transformer using a wound iron core made of an amorphous magnetic alloy ribbon.

[0002]

2. Description of the Related Art In recent years, the use of amorphous magnetic alloy ribbons (hereinafter simply referred to as magnetic ribbons) as an iron core material is gradually increasing in wound iron cores used in stationary induction electric equipment such as distribution transformers. Is coming. This magnetic ribbon is manufactured by ultra-quenching a melt of a magnetic alloy and has a very 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 formed. Then, this winding iron core is formed into a rectangular shape by fastening an iron core tightening band to the outside, and after magnetic field annealing, the winding is wound directly on the leg iron part, or a magnetic thin film is used. Unit iron cores obtained by cutting the strip for each turn are grouped into a plurality of sheets (number + sheets) to form a unit laminated iron core,
The unit laminated core is further laminated into a plurality of layers to form a unit laminated block (hereinafter, simply referred to as a laminated block),
In assembling the wound core, the laminated block is wound and the ends of the unit laminated core are sequentially abutted or overlapped with each other while being shifted stepwise, and the laminated block is further joined.
Required number of layers After laminating in the same manner as described above to form a one-turn cut type wound core having a predetermined laminated thickness, 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. , Magnetic field annealing. After that, the wound iron core opens the joint of the yoke portion for each laminated block, sequentially incorporates each laminated block into the iron core insertion hole of the winding, and rejoins the joined portion of each laminated block before A one-turn cut type winding core was assembled by winding a tightening band.

Next, in the case of manufacturing a transformer using the wound core manufactured by the uncut method or the one-turn cut method, the iron cores are provided on the yoke portions above and below the wound iron core having the windings. And a clamp for fixing the contents of the transformer consisting of windings, and then the contents of the transformer are housed in a case, and the contents fixing metal fittings provided at both ends of the clamp attached to the upper yoke portion of the winding iron core, After fixing and supporting the support bracket formed on the inner wall surface of the case with the fixing bolt,
The company was manufacturing a distribution transformer by filling the case with insulating oil. Although the inside of the transformer is covered with a case, the outer surface of the transformer is usually at a high potential when the transformer is energized because of the capacitance existing between the surface and the ground. Since there is a risk of electric shock when touched or approached by the human body, a grounding terminal is provided on the outer surface of the transformer case. Was solved.

[0004]

However, in the above-mentioned transformer, when the winding core constituting the contents of the transformer is grounded to the ground terminal provided on the outer surface of the case, it is usually tightened around the outer circumference of the winding core. Since the attached band is clamped on the clamp, the electrification of the winding iron core can be prevented by tightening the band → clamp →
It was led to the ground terminal through the fixing bracket for the contents → the case.
This is because when the transformer is energized, the high voltage applied to the high voltage winding causes electrostatic induction in the winding iron core, which results in charging, for example, between the winding iron core and the clamp or the low voltage winding. This is to prevent the occurrence of a discharge phenomenon and deterioration and damage to the insulating oil and the insulator 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, and further, it is annealed. In this state, because it is very vulnerable to
When a tightening band is tightened around the outer circumference of the wound core after it is assembled, it becomes difficult for the wound core to withstand the tightening force, and local mechanical strain may occur despite annealing. However, there has been a big problem that the magnetic characteristics of the wound iron core are impaired due to the deformation of the shape.

Further, since the magnetic ribbon is extremely brittle as a result of annealing as described above, when the winding is wound around the winding 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 iron core, the corners and laminated end surface of the wound iron core are easily Debris is generated by chipping or chipping. If the debris remains in the core insertion hole of the winding after the winding core is assembled,
During operation of the transformer, if convection of insulating oil strays and strays and penetrates between the layers of the winding, there is a problem of causing an interlayer short-circuit accident. As a result, when manufacturing a transformer using a wound core made of magnetic ribbon, not only the core characteristics deteriorate, but also the manufacturing efficiency is very poor, and the productivity of transformers that utilize the characteristics of the magnetic ribbon is poor. It was a major factor that prevented improvement.

In view of the above problems, the present invention eliminates the harmful effect of using a tightening band by fitting a grounding terminal in a state in which the winding iron core is surrounded by a thin insulating material, and at the same time, It is an object of the present invention to provide a grounding terminal mounting device that reliably eliminates the stripping phenomenon of the magnetic ribbon, which is the material, and enables the manufacture of a transformer with excellent iron core characteristics and productivity.

[0007]

According to the present invention, for example, a reinforcing frame made of a thick raw steel strip having a thickness greater than that of a magnetic strip is provided on the outer and inner peripheral surfaces of a wound core wound by a one-turn cut method. Set, this coiled iron core is formed into a rectangle, and after magnetic field annealing,
Wrap a thin insulating material around the leg iron part of the winding core so as to wrap around this part, and then make the yoke part having the joining part of the winding core into a U-shape. After opening, in this state, insert the leg iron part into the winding by using the opened yoke part, and then re-join the opened yoke part to finish the assembly of the wound iron core. Then, the yoke portions above and below the winding iron core, that is, the portions exposed from the winding are wrapped with a thin insulating material to completely cover the iron core portion. Then, among the covered yoke portions, in the gap of the overlapping portion of the reinforcing frame that reinforces the outer periphery 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 used. Press in about half the length from the outside of the insulator, bend the part exposed from the yoke part of this terminal into a U shape, and bend the bent part.
The clamp that is attached and fixed by applying the coil retainer to the yoke part of the winding core is fixed by using a set screw to ground the reinforcing frame around the winding core covered with a thin insulator. It is characterized in that the winding core transformer is configured by connecting the terminals, storing the contents of the transformer equipped with this grounding terminal in a case, and fixing the contents fixing bracket provided in the clamp part to the inner wall of the case. And

According to the present invention, even if the yoke portion of the winding core exposed from the winding is covered with a thin insulator, the ground terminal is provided from the outside of the covering insulator to the outer periphery of the winding core. The press-fitting is performed by using the narrow gap that is inevitably generated near the overlapping part of the reinforcing frame, and the part exposed from the yoke part is fixed to the clamp by screwing or the like. Therefore, even if the winding core is completely covered with an insulator, the grounding terminal can be easily attached, so that the winding core is electrified using the conventional tightening band for tightening the iron core. Without using the tightening band for tightening the winding core, it is possible to easily lead to the ground terminal through the ground terminal → clamp → content fixing bracket → case without using the tightening band. Be sure to eliminate the harmful effects of It can be. The wound iron core itself is provided with a required reinforcing frame made of a material different from that of the magnetic ribbon on the inner and outer peripheral surfaces of the iron core wound with the magnetic ribbon.
Since the leg iron part of the winding iron core is provided with a means for preventing the thin film insulator from bending around to prevent the magnetic ribbon from being damaged or peeled off, the winding iron core weakened by annealing can be used when assembling it. Alternatively, when a transformer is assembled using a wound core, even if an external force is applied to the wound core or mechanical vibration is transmitted during transfer, the wound core will have inner and outer peripheral surfaces and laminated end surfaces. It is possible to satisfactorily prevent the wound core from being damaged and having internal strain caused by being buffered by the insulating members respectively arranged, and thus it is possible to provide a transformer having excellent electrical characteristics. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the present invention is applied to a one-turn cut type winding core will be described below with reference to FIGS. Figure 1
In the figure, 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 to remove the amorphous magnetic alloy thin film. Each time a strip (hereinafter referred to as a magnetic strip) T is wound around the winding frame 12, the cutting device 13 cuts the magnetic strip T in a circular shape for a predetermined number of times to form a 1-turn cut type winding core original shape. The wound core element body 14 is formed. In winding the core element 14, the magnetic core single plate 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 element body 14 via guide rollers 15.

The circular wound core element 14 wound as described above is attached to the outermost periphery thereof with, for example, an adhesive tape (not shown), and is removed together with the winding frame 12 from the winding shaft 11.
As shown in FIG. 2, the wound core body 14 removed from the winder has a thicker plate than the magnetic ribbon T on the outer peripheral surface thereof, for example,
The silicon steel strip is wound slightly over one turn, and 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.
Shaped inner reinforcing frame 17 (opening a is wound around the core body 1
It is made to face the position of the junction b of No. 4. ) And a ring-shaped innermost reinforcing frame (the abutting portion c of the tip is located on the opposite side of the opening portion a of the inner reinforcing frame 17) 18 in a range that does not form one turn. The core state of the wound core body 14 is maintained.

Next, as shown in FIG. 3, the circular wound iron core element 14 is pressed simultaneously from the front / rear and left / right directions by a hydraulic press or the like through the forming plates 19 and 20 to form an oval shape. Transforms into. Then, as shown in FIG. 3, in a state in which the wound core element body 14 is pressed and held in an oval shape, at the position corresponding to the yoke portion of the wound core, the pair of molding dies 21 and 22 are
The recessed grooves 23 recessed in the dies 21 and 22 are inserted and arranged so as to face each other, and in this state, the lower end between the recessed grooves 23 and 23 is a taper-shaped die whose length dimension is slightly shorter than the upper end. While press-fitting the plates 24, 24 (see FIG. 4) between the recessed grooves 23, 23 by the press, at the same time, the oblong-shaped core body 14 is further pressed by the forming plates 19, 20. As shown, it is molded into 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 using tightening bolts (not shown), and the forming and 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 part 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 body 14 is placed in an annealing furnace filled with an inert gas, and the exciting coil 2
At the same time when a constant current is applied to 6, 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 the concave grooves 2 of the forming dies 21 and 22 are further removed.
The mold plate 24 is pulled out from the molds 23 and 23,
At the same time, the rectangular core holding state of the wound core body 14 is released by removing the wound core body 14 from the wound core body 14 to form the wound core 27. As described above, when the magnetic field annealing is performed, the wound iron core 27
As shown in FIG. 5, the shaping for maintaining the rectangular state is completed, and the existence of the inner and outer reinforcing frames 16 to 18 enables the rectangular state to be favorably maintained.

Next, only the innermost reinforcing frame 18 formed into 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. The second molding dies 28, 29 are arranged on the yoke portions e, f in the window of the wound iron core 27, and the plate-shaped template plate 30 is provided 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. Second molding dies 28, 29 and template 30
After taking measures to prevent the winding iron core 27 from losing its shape,
As shown in FIG. 6, on both sides of the laminated end surface of the leg iron portion d of the wound iron core 27, for example, a room temperature curable adhesive is applied at a plurality of positions at predetermined intervals in the length direction of the leg iron portion d. Adhesive part 31
To form. After the adhesive portion 31 is formed, before the adhesive is hardened, the inner portion of the relatively thin insulating paper provided with the length dimension of the leg iron portion d and bent in a U shape in the width dimension is formed. The same adhesive as described above is applied, and this insulating paper is wound and attached so as to wrap around the entire leg iron part d from the vertical direction of the laminated end surface of the leg iron part d.

In 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 is immovably attached to the leg iron portion d. be able to. In this manner, the leg iron portion d of the wound iron core 27 is damaged by the laminated end face of the leg iron portion d, and the magnetic ribbon which is fragile due to external impact, annealing, or annealing. The insulating reinforcing portion 32 is formed to prevent the insulating reinforcing portion 32 from peeling off. The adhesive portion 31 is formed on the leg iron portion d in order to prevent the insulation reinforcing 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 insulating reinforcing portion 32 on the leg iron portion d, the second molding fittings 28, 29 and the template 30 are removed from the wound iron core 27.

As described above, when the insulating reinforcing portion 32 is formed on the leg iron portion d of the winding iron core 27, the leg iron portion d of the winding iron core 27 becomes
It is possible to prevent the laminated end faces from peeling off, and the presence of the inner and outer reinforcing frames 16 and 17 can enhance the rigidity of the leg iron portion d. 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 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 the reinforcing frame 16, the elastic force of the material itself remains, so that the reinforcing frame 16 can be easily opened. Expand to the position almost 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 where the joining portion b is located is changed from the rectangular state in FIG. 7 to the yoke portion e as shown in FIG. It is opened so that the planar shape is U-shaped up to a position substantially on the same line. The operation of opening the yoke portion e is performed by the insulation reinforcement portion 3 formed on the leg iron portion d of the winding iron core 27.
2. The winding iron core 27 is sufficiently retained in rigidity by the reinforcing frame 16 arranged on the outer peripheral surface of the wound iron core 27 and the U-shaped inner reinforcing frame 17 arranged on the inner peripheral surface, so that the winding iron core 27 is deformed by its own weight or deformed. U winding core 27 smoothly and satisfactorily without causing
It can be opened like a letter.

On the other hand, in the winding 34 incorporated in the winding core 27, as shown in FIG. 8, the innermost reinforcing frame 18 removed when the insulating reinforcing portion 32 is formed on the leg iron portion d of the winding iron core 27 is formed. ,
As shown in FIG. 8, the iron core insertion hole 35 is fitted in a rectangular shape as shown in FIG. In the above-described state, the wound iron core 27 opened in the U-shape is such that the joint b of the opened yoke portion e faces the iron core insertion hole 35 of the winding 34 as shown in FIG. When the winding iron core 27 is inserted into the iron core insertion hole 35 from the yoke portion e side provided with the joint portion b of the winding iron core 27, the reinforcing frame 18 of the winding iron core 27 is slidably contacted with the insulating and reinforcing portion 32, and the winding iron core portion e extends from the leg iron portion d. It can be incorporated into the winding 34 in almost one operation.

As shown in FIG. 9, the wound iron core 27 opened in the U-shape is fitted into the winding wire 34, and then, between the axial end portion of the winding wire 34 and the innermost reinforcing frame 18. Figure 1 in the void
As shown by 0, spacers 36 and 37 made of an insulating material are inserted, and subsequently, the yoke portion e of the opened winding iron core 27 is sequentially bent from its innermost layer portion to a state before opening (inside), As shown in FIG. 10, the open piece g is joined to each other to form the joint b again. And the iron core 27
The free end of the outer reinforcing frame 16 arranged on the outer periphery of the joint b
Are superposed on the outer peripheral surface of the yoke portion e where is located, and the ends of this portion are fixed by spot welding or the like, and as shown in FIGS. 11 and 12, the assembly work of the winding core 27 to the winding 34 is completed. . After fixing the overlapping portion of the outer reinforcing portion 16, a wedge 38 is fitted in the gap between the spacer 36 and the innermost reinforcing frame 18 to fix the winding 34 in the window of the winding core 27. .
Then, the outer reinforcing frame 16 is fixed by overlapping the free ends of the outer reinforcing frame 16 with each other on the outer peripheral surface of the yoke portion e having the joint portion b of the wound 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 and assembled, as shown in FIG. 12, the whole area of the yoke portions e and f of the winding iron core 27 is thin. The insulator 39 is wrapped and covered 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 core 27 having an arcuate portion, and is also excellent in insulation. Oil is used as a nonwoven fabric made of a synthetic fiber having a high degree of porosity that is well adapted to oil, for example, trade name "Vilene" (manufactured by Nippon Vilene Co., Ltd.).

When the thin-walled insulator 39 is wrapped, the insulator 39 is cut into a rectangular shape with an area where the laminated end faces and the outer peripheral edges of the yoke portions e and f can be integrally wrapped. And then cut insulation 3
9 is applied to the outer peripheral surface of the yoke portion e, is bent into a U-shape, and the bent piece is brought into contact with the yoke portion e side, and the portion protruding to the outer peripheral edge side of the yoke portion e is Thirteen
, The yoke portion e is bent from the laminated end surface side toward the outer peripheral edge side, and the bent portion is adhered to the outer peripheral edge by an adhesive tape, so that the yoke portion e is insulated from the thin leaf. Item 39 is completely covered. When the covering of the yoke portion e with the insulator 39 is completed, the other yoke portion f is also covered with the insulator 39 as described above. When the insulator 39 is coated on the yoke portions e, f, the yoke portions e, f are previously formed.
By appropriately applying an adhesive or the like to the laminated end faces of the above and then starting the wrapping work, the work of covering the yoke portions e and f of the insulator 39 can be smoothly and favorably performed. Further, after the insulator 39 is wrapped, an insulating varnish or the like may be applied on the insulator 39 to prevent the insulator 39 covering the yoke portions e and f from coming off.

As described above, after covering the yoke portions e and f of the winding iron core 27 with the thin leaf insulating material 39,
As shown in FIG. 13, the winding 3 is formed on the outer peripheral surface of the winding core 27.
A band-shaped adhesive insulating paper 40 coated with an adhesive is wound through the core insertion hole 35 of No. 4 and the press board is interposed between the leg iron portion d of the winding core 27 and the winding wire 34 by the interposition of the adhesive insulating paper 40. By press-fitting a guide plate (not shown) slightly thicker than the iso-insulating paper at the center position of the winding core 27 in the width direction,
The winding iron core 27 and the winding wire 34 are inserted in the radial direction side with the spacers 36 (wedges 38) and 37 inserted in the axial direction side of the winding wire 34 in a state where a gap is formed on the side of the guide plate. In addition, it can be fixed and supported by the guide plate (not shown) without swinging vertically or horizontally. As a result,
In the wound iron core 27 weakened by magnetic field annealing, the leg iron portion d is covered by the insulation reinforcing portion 32, and the yoke portions e, f are covered by the thin leaf insulating material 39. Since the reinforcing frames 16, 17, and 18 are arranged on the outer peripheral surface, it is possible to reliably prevent the fragments of the magnetic ribbon T generated from the impact or the vibration due to the external force from leaking to the outside. The presence of the reinforcing frames 16, 17, and 18 makes it possible to strengthen the rigidity.

Next, a gap s formed between the overlapping edge of the outer reinforcing frame 16 disposed on the outer peripheral surface of the winding core 27 on the side of the upper yoke portion e and the upper end surface of the yoke portion e. In addition, as shown in FIG.
Press in the length of 3. Then, 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, the adhesive terminal 41 press-fitted into the gap s of the outer reinforcing frame 16 has the winding core 27, as shown in FIG.
The part protruding to the surface of the yoke part e of
A part of the horizontal protruding portion P is bent and bent in a U-shape on 9 to form an engaging portion t with a clamp described later.

After the ground terminal 41 is bent in the U-shape as described above, the winding core 27 incorporated in the winding 34 is raised as shown in FIG. A plate-shaped winding retainer 42 made of an insulating material is applied to the laminated end faces by abutting the upper and lower end faces of the winding 34 in the axial direction. in this case,
As shown in FIG. 16, 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 41 is the same as the above. The protruding portion p is engaged with the notch hole 43 cut out at the position where the grounding terminal 41 of the winding retainer 42 protrudes so that the U-shaped engaging portion t can be pulled out to the outside of the winding retainer 42. Has been formed.

When the above-mentioned clamp is attached to the winding core 27, the upper clamp 44 and the lower clamp 45, which are wider than the width of the winding iron core 27 and are formed into a U-shape.
1 to the corresponding yoke portions e and f of the winding iron core 27, respectively.
Play as shown in 7. In this case, as shown in FIG. 17, since the ground terminal 41 has the U-shaped engaging portion t, when the upper clamp 43 is loosely engaged, one of the bent pieces is engaged with the engaging portion of the ground terminal 41. It can be mounted by being properly engaged with t. Also, the upper and lower clamps 44, 45 are
Since the winding retainer 42 is formed with a length protruding from the outer peripheral surface of the winding iron core 27, the outer peripheral surface of the winding iron core 27 is up,
Without contacting the lower clamps 44, 45, the clamps 44, 45 can be loosely held in a floating state. As described above, after the upper and lower clamps 44 and 45 are loosely engaged with the winding iron core 27, a clamp tightening band 46 is punched from the lower side of the lower clamp 45 as shown in FIG. A hole formed by a guide plate (not shown) which is inserted into the hole 47 and is press-fitted into the leg iron portion d of the winding iron core 27 between the winding wire 34 and the winding wire 34 is vertically penetrated, and is wound as it is from the through hole 48 of the upper clamp 45. The upper and lower clamps 44 and 45 are secured to the winding 34 by the tightening band 46 via the winding retainer 42 by projecting the iron core 27 upward and fastening the projecting end on the upper clamp 44. Fixed and supported on. As a result, the wound iron core 27 can be held in the winding 34 in a non-pivotable manner without any mechanical stress due to the attachment of the upper and lower clamps 44, 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 of the ground terminal 41 is fixed to the bent portion of the upper clamp 44 by using a set screw 50 to transform the transformer. The assembly of the container contents 51 is completed. As a result, the ground terminal 41 is press-fitted into the gap s of the outer reinforcing frame 16 on the outer periphery of the winding core 27 from above, even if the entire yoke portions e and f of the winding core 27 are covered with the thin insulating material 39. Since it is fixed to the upper clamp 44, the winding iron core 27 and the upper clamp 44 can be electrically conductively connected. As shown in FIG. 17, the transformer contents 51 configured as described above have the contents fixing metal fittings 52 attached to both ends in the length direction of the upper clamp 44, and the attachments formed on the inner wall portion of the case not shown. The transformer contents 51 housed in the case can be securely fixed to the case by tightening the seat with the tightening bolts. Therefore, the electrification of the winding iron core 27 can be well 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 and flow to the ground.
The winding core 27 is completely covered by the insulation reinforcing portion 32 provided on the leg iron portion d and the thin leaf insulating material 39 covering the yoke portions e and f so that the iron core portion is not exposed to the outside. So
Even if an external force is applied to the winding iron core 27 and the magnetic ribbon T is lost, the fragments can be retained inside the winding iron core 27 without being scattered to the outside.
It is possible to favorably prevent the harmful effects of the debris.

[0025]

Since the present invention is constructed as described above, it has the following effects. (1) In the present invention, when connecting the ground terminal, the grounding terminal itself is directly contacted with the winding core through the insulator to the yoke portion of the winding iron core covered with the thin-walled insulating material to electrically connect the clamp and the electric wire. Since the structure that connects to the core is adopted, the transformer core that is covered with an insulating material to prevent external dissipation of debris in order to prevent damage due to weakening due to annealing is reliably and Can be grounded. (2) In addition, the ground terminal is a gap that is inevitably formed between the overlapping edge of the outer reinforcing frame and the outer peripheral surface of the winding core in the reinforcing frame that reinforces the inner and outer peripheral surfaces of the winding core. Since it is only necessary to press fit one of the plate-shaped ground terminals through the insulator covering the winding iron core and connect the other to the clamp, the ground terminal installation work can be done quickly without using special jigs or parts.・ It can be done reliably. (3) Also, since the wound core becomes very fragile when annealed due to the characteristics of the iron core material, the present invention requires that the wound core be directly fixed to the clamp using a tightening band as in the conventional case. In contrast to the case, the leg reinforcement part is covered with the insulation reinforcement part, and the yoke part is covered with thin-layer insulation, so that the clamp is attached with the tightening band in a state where it is completely shielded from the outside. Even if the magnetic ribbon is broken due to external force and fragments are generated, the fragments can be kept inside the insulator that covers the winding core, so the existence of the fragments ensures no adverse effect on the transformer. In addition, even if the winding core is covered with an insulator, the grounding terminal has a structure that is fitted to the outer reinforcing frame of the winding core as described above. Grounding can be done quickly and surely.

[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 diagram showing a process of assembling the wound core.

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

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

FIG. 13 is an explanatory view 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. 14 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. 15 is a perspective view of a wound core showing a mounting state of a ground terminal according to the present invention.

FIG. 16 is a perspective view showing an assembling process of the wound core transformer.

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

[Explanation of symbols]

 16 Inner Reinforcement Frame 17 Outer Reinforcement Frame 18 Innermost Reinforcement Frame 27 Winding Iron Core 34 Winding 39 Insulator 41 Ground Terminal 44 Upper Clamp 45 Lower Clamp 46 Tightening Band 50 Set Screw 51 Transformer Contents

Claims (2)

[Scope of utility model registration request] 1. A transformer in which a winding is wound around a wound iron core formed by winding an amorphous magnetic alloy ribbon a predetermined number of times,
A portion of the winding core exposed from the winding portion is covered with a thin insulating material, and one end of a grounding terminal is press-fitted into the winding core covered with the insulating material, which is the other end of the grounding terminal. An apparatus for mounting a ground terminal of a transformer, characterized in that: is attached to a clamp attached to a yoke portion of a winding iron core. 2. The ground terminal comprises an outer reinforcing frame made of a material thicker than an amorphous magnetic alloy thin strip, such as a silicon steel strip, arranged around the winding core, and the free ends of the outer reinforcing frame overlap with each other. The device for mounting a ground terminal of a transformer according to claim 1, wherein the device is press-fitted into a gap formed between the outer peripheral surface of the wound core and the outer peripheral surface of the wound core to be fixed.