JPH08191018A - Resin molded transformer - Google Patents

Abstract

PURPOSE: To improve the stability of a transformer having resin molded coils and cores and metal fixtures to fix the coils and cores by coloring the coil with a light color and fixtures with a dark color. CONSTITUTION: A transformer uses resin molded coils. Primary coils 201U-201W, secondary coils 202U-202W and cores 203a and 203b are fixed between an upper and lower frames 204 and 205 which are coupled through metal couplings piercing the secondary coils 202U-202W. The coils 201U-201W and 202U-202W of the transformer having such structure are colored with a yellow paint having a higherlightness and the lower and upper frames 204 and 205 and base part 206b with a darker gray paint.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction device such as a transformer using a resin mold coil.

[0002]

2. Description of the Related Art A resin mold coil in which a coil is cast with a thermosetting resin to form a mold resin layer around the coil is widely used as a coil of a resin mold transformer.

As a technique of such a conventional resin molded coil, for example, those described in JP-A-54-50957 and JP-A-57-121207 are known.

In the technique disclosed in Japanese Patent Laid-Open No. 54-50957, an insulating layer is formed by a resin spacer and an injection resin on the inner circumference of a coil formed by winding a conductive wire. In the technique described in Japanese Patent No. 121207, an insulating layer is formed on the inner and outer circumferences of the coil by the insulating prepreg sheet and the injected resin.

In addition to the above, there is known a method of winding a coil around an inner die of a winding die and a die and injecting resin into the coil using a die formed as an outer die. Conventionally, the coil manufactured as described above is attached to an iron core to form a transformer.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to the technique described in Japanese Patent No. 957, although a resin of the same kind as the spacer is used as an injection resin in order to form an integral insulating layer, a resin (spacer) that has already been cured and a molten resin are used. There is also a problem that the (injected resin) and the injected resin are not sufficiently bonded to each other, and the spacer may be separated from the injected resin after the injected resin is cured, causing dielectric breakdown there.

Further, according to the technique disclosed in Japanese Patent Laid-Open No. 57-121207, air is entrained between the sheets in the process of winding the insulating prepreg sheet, and the insulating layer causes dielectric breakdown. There is a problem that it may happen.

On the other hand, according to the method of disposing the mold on the inner circumference and the outer circumference of the coil, a good insulating layer having excellent appearance of the coil surface and excellent moisture resistance and mechanical strength can be formed. Since there are a large number of parts, there are some problems in productivity and economy in mold maintenance, etc. due to diversified specifications.

Further, in a transformer using such a resin mold coil or the like, as a general problem,
Although it is expected that safety and easiness of handling will be improved, none of the above-mentioned prior arts gives any consideration to visual safety improvement when the transformer is mounted on a transformer.

Therefore, an object of the present invention is to form a good insulating layer on a resin molded coil and to improve the safety of the transformer and the easiness of handling.

[0011]

In order to achieve the above object, the present invention fixes a resin mold coil, an iron core inserted in the mold coil, and the resin mold coil and the iron core. A metal fitting group, wherein the resin molded coil is colored in a light color, and the metal fitting group is colored in a dark color.

[0012]

In addition, the transformer using the resin mold coil according to the present invention has a coil which is mechanically reinforced, has excellent moisture resistance, and has an excellent surface appearance, and has a lightness rather than a saturation. Since it is shown that the contact with the mold coil portion is dangerous, the danger can be clearly shown even when installed in a basement or the like where lighting is not prepared (dim).

[0013]

EXAMPLES Each example according to the present invention will be described below.

First, a resin mold coil according to a first embodiment of the present invention will be described with reference to FIGS.

The resin mold coil of this embodiment is used for a transformer. Generally, a transformer has a high voltage coil 1 and a low voltage coil 2 as shown in FIG. 1, but here, a high voltage (for example, 3k) molded by resin is used.
V) The coil 1 will be described. In the figure,
3 is an iron core.

The high-voltage resin mold coil 1 of this embodiment is
The coil main body 10 is formed by winding the conductive wire 11 and has an annular cross section, and the insulating layer forming base 21 provided on the outer peripheral surface and the inner peripheral surface thereof.

Interlayer paper 12 is formed between the winding layers formed of the conductive wire 11 of the coil body 10.

As shown in FIG. 2, the insulating layer forming substrate 21 includes a prepreg sheet (insulating sheet) 22 in which a glass cloth sheet formed by weaving glass fibers having an insulating property is impregnated with an epoxy resin, and a glass fiber. , And a plurality of glass mats (insulating fiber mats) 23, 23, ... The glass mat 23 is formed such that its vertical length l is the same as the vertical length of the prepreg sheet 22, its horizontal length w is 10 mm to 30 mm, and its thickness h is about 2 mm to 5 mm. The plurality of glass mats 23, 23, ... Are attached to the prepreg sheet 22 with an epoxy adhesive at a constant interval A in the lateral direction. The space between the glass mats 23, 23 serves as a resin passage 24 through which a resin 25 described later flows. Further, a value obtained by adding the thickness h of the glass mat 23 and the thickness t of the prepreg sheet 22 becomes a thickness (duct height) T of the insulating resin layer 20 described later.

When resin molding the coil body 10, as shown in FIGS. 1 and 3, the glass mat 23 of the insulating layer forming substrate 21 is in contact with the inner peripheral surface and the outer peripheral surface of the coil body 10. The insulating layer forming substrate 21 is wound around the coil body 10. At this time, the prepreg sheet 22 of the insulating layer forming substrate 21 is in a semi-cured state. After that, the epoxy resin 25 is injected between the inner peripheral surface and the outer peripheral surface of the coil body 10 and the prepreg sheet 22 of the insulating layer forming base 21. This injection epoxy resin 25
While flowing through the resin passage 24 between the glass mats 23, 23, soaks into the glass mat 23, and the coil body 1
It spreads entirely between the inner peripheral surface and outer peripheral surface of 0 and the prepreg sheet 22 of the insulating layer forming base 21. Epoxy resin 2
When injecting 5, the air is gently injected so that air is not mixed therein, and the coil body 10 is vibrated so that even if air is mixed in, it can be eliminated. Examples of this vibration method include applying ultrasonic waves of a predetermined frequency to the coil body 10. When the injected epoxy resin 25 cures,
The resin mold coil 1 is completed.

In this manner, the insulating resin layer 20 including the injected epoxy resin 25 and the insulating layer forming base 21 is formed on the outer circumference and the inner circumference of the coil body 10.

When forming an insulating layer by winding an insulating tape in many layers as in the prior art, slack or elongation of the tape inevitably results in the formation of voids between the tapes. On the other hand, in this embodiment, since the injecting resin 25 having fluidity is injected between the coil body 10 and the prepreg sheet 22 to form the insulating layer 20, a void is formed in the insulating layer 20. Almost never. Moreover, when injecting the resin 25, the air in the resin 25 can be almost completely eliminated by performing the above-described treatment. Further, since the injected resin 25 soaks into the glass mat 23 and the insulating layer forming base 21 and the injected resin 25 are completely integrated, the spacer is separated from the injected resin as in the prior art using spacers, and insulation is achieved. No void is formed in the layer. Therefore, in the present embodiment, it is possible to prevent dielectric breakdown and deterioration of heat conduction due to the voids in the insulating layer 20.

Further, in this embodiment, by preparing the insulating layer forming substrate 21 in advance, it is troublesome to arrange a plurality of spacers at a constant interval as in the prior art, and the insulating tape is attached to the coil body 10. It saves the work of winding several layers around and can shorten the production time. Further, in this embodiment, since the glass fiber is mixed in the insulating layer 21, the strength against various impacts can be increased.

First, a method of manufacturing the resin mold coil according to this embodiment will be described with reference to FIGS.

In this embodiment, an inner die 101 which also serves as a winding die and a die is used, and a glass mat 104 is wound around the outer periphery thereof (that is, the innermost periphery of the mold coil is finally formed) to form an inner insulation layer. After the securing, as shown in FIGS. 1 and 3 and the like, the conducting wire 11 and the interlayer paper 12 are wound around this to form the winding coil 103. Next, the glass mat 104 is also wound around the outer periphery of the winding coil 103 (that is, the outermost periphery of the molded coil finally) to secure the outer periphery insulating layer. Two metal plates 102 having flexibility are used for the outer mold. After the side edges of both metal plates 102 are overlapped with the bent portions at both ends of the casting jig 105 and clamped and fixed by a holding jig (FIG. 5) such as a vise 106, along the outer shape of the coil body, After winding the metal plate, tighten the coil body with a band etc. at several points. Pin 1 on the side of the inner mold 101
21 project, which fit into corresponding holes 122 of the casting mold 105 for mutual positioning. Similarly, casting 10
Pins 123 and 124 project from the bottom of the base 5, which is the bottom 1.
The corresponding holes 125 and 126 of 20 are fitted and positioned with respect to each other. Resin is injected into the mold thus formed.

The dimensions of each outer metal plate 102 are as follows.
The vertical length is equal to or higher than the coil height, and the horizontal length is equal to or greater than the outer circumference of the coil. In addition, since the metal plates are flat before the outer mold is formed, they can be stacked, and the space for storing the outer mold can be reduced. The glass mat 104 not only secures an insulating layer but also serves to impregnate a resin.

FIG. 6 is a perspective view of the resin mold coil 107 manufactured by the above-described manufacturing method as viewed from the back side. The glass mat 104 is positioned on the inner and outer insulating layers, the outer die is wound along the coil shape, and the outer die is tightened with a band or the like. Therefore, in the completed coil, on the coil surface,
The fibers of the glass mat 104 are visible in places (131). Moreover, since the metal plate 102, which is the outer mold, is stacked on the back surface of the coil
A step is formed on the surface of the coil by the thickness of the metal plate, and the appearance is that the streak 109 extending in the coil height direction or a trace of the streak left is left.

FIG. 7 shows the resin mold coil 107 of FIG.
The AA sectional view taken on the line in FIG. A strong resin insulating layer 108b containing a glass mat is formed on the inner and outer circumferences of the wound coil 103. An insulating layer 108a made only of resin is formed as three layers dispersed in the coil height direction. Here, the glass mat 104 used for the insulating layer is 300 to 500 g.
A product having a fiber density of / m ² is commercially available, and a product having a fiber density in this range is applicable to the present coil. Further, in this range, particularly, one having a fiber density of 500 g / m ² has a resin impregnating property at the time of casting and a strength capable of withstanding the pressure applied at the time of winding and clamping the outer mold, and has an inner / outer peripheral insulating layer. It is preferable as an insulating material to be placed in

Further, in this embodiment, the above-mentioned interlayer paper 12 is also used.
As the heat-resistant film 15 of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyetherimide (PEI), polyimide (PI), etc.
To use. Since these materials have high thermal conductivity, the cooling of the mold coil can be enhanced by using such a film. Therefore, when a coil having the same rating is obtained according to the present embodiment by incorporating it into a conventional coil, it can be effectively cooled even if the current density is increased to increase the heat generation, so that the conductor portion of the coil should be downsized. You can Further, as described above, the strength can be obtained even if the inner and outer peripheral insulating layers are thinner than the conventional one, so that the size of the entire mold coil can be reduced.

Polyethylene terephthalate (PET) has a thermal conductivity of 0.151 and polyethylene naphthalate (P).
EN) has a thermal conductivity of 0.151, polyetherimide (PEI) has a thermal conductivity of 0.198, and polyimide (P
The thermal conductivity of I) is 0.156 (all units are w / m
・ K), the breakdown voltage of polyethylene terephthalate (PET) is 220, polyethylene naphthalate (PE
N) has a breakdown voltage of 294, polyetherimide (P
The breakdown voltage of EI) is 210, and the breakdown voltage of polyimide (PI) is 260 (all units are kV / m.
m).

According to the embodiment described above, the inner die also serving as the winding die and the die, and the outer die formed by winding the flexible flat plate around the outer circumference of the coil are used, and the spacer for the inner die and the outer die is used. The following effects can be obtained by using an insulating material having a good resin impregnating property. That is, (1) workability at the time of manufacturing the resin mold coil can be improved.

(2) The mechanical strength of the inner and outer peripheral resin insulation layers can be improved.

(3) Maintenance of the outer type is not required.

(4) Cooling efficiency of the coil can be achieved by processing the outer flat plate.

(5) The moisture resistance of the coil is improved.

(6) Since the metal flat plate is in close contact with the coil, the required minimum insulating layer thickness can be formed, and an unnecessary resin is not required.

Now, a transformer using each of the above-described mold coils will be described below as a fourth embodiment of the present invention.

8 and 9 show the appearance of the transformer according to this embodiment. FIG. 8 is an external view of the transformer as seen from the front side and diagonally above, and FIG. 9 is an external view of the transformer as seen from the rear side and diagonally above.

8 and 9, 201U, 201
V and 201W are U-phase, V-phase and W-phase primary coils, 20
3a and 203b are iron cores. Although not shown in the figure, each secondary coil 202U, 202V, 202W
The primary coils 201U, 201V, 201W are inserted on the inner peripheral side. That is, in the illustrated transformer, the legs of the wound iron cores 203a and 203b have the secondary coils 202
U, 202V, 202W, each secondary coil 20
2U, 202V, 202W are primary coils 201U,
It is inserted on the inner peripheral side of 201V, 201W. In addition,
For these coils, an insulating material having a high thermal conductivity such as polyethylene naphthalate as described in the third embodiment is used as an interlayer paper. Therefore, also in the present embodiment, the current density can be increased and the coil can be miniaturized by the cooperative resin insulating layer including the interlayer paper having high thermal conductivity and the glass mat.

Here, in this embodiment, the iron core 203a,
A wound iron core manufactured by winding a silicon steel plate is used as 203b. However, the iron core may be formed by winding a thin plate of amorphous metal or the like. By using the wound iron core in this manner, iron loss is reduced and energy saving can be achieved as compared with the case of using a laminated iron core. Further, as described above, according to the present embodiment, since the mold coil can be manufactured in a small size, it is sufficient that the iron core is small and lightweight. Therefore, from this point, it is possible to reduce iron loss and save energy as compared with the conventional case.

For example, in the case of a three-phase transformer, 20 kVA
For a model of up to 500 kVA, the depth dimension can be 345 mm at 20 kVA and 505 mm at 500 kVA. Moreover, in the case of a single-phase transformer, it is 20 kVA-500.
For kVA models, 10 kVA 360 mm, 300
Even kVA can be 505 mm. This allows a reduction of about 10 percent volume over the conventional one. Also, with the miniaturization of the coil, the iron core is about 5
The percentage can be reduced, and the iron loss can be reduced by about 5 percent, so that the no-load loss can be reduced by about 5 percent. Further, since the depth dimension is thinner than the conventional one, even if the insulation distance is taken into consideration, it can be housed in a thin cubicle having a depth of 700 mm which is one of the recommended dimensions of GEM1424.

Now, the wound cores 203a, 203b, the primary coils 201U, 201V, 201W, the secondary coil 20.
2U, 202V, 202W are lower frame portions 204
And the upper frame portion 205. The lower frame portion 204 is connected to the two base portions 206a and 206b via the four vibration-proof rubbers 300, and the two base portions 206a and 206b are attached to the floor when installed on the floor. Since it is cut with a tap, it is fixed with a screw hole and a male screw. Although not shown in the figure, the lower frame portion 204 and the upper frame portion 205 are respectively connected to the secondary coils 20.
2U, 202V, 202W are connected by a connecting metal fitting penetrating the inner peripheral side. In addition, the winding iron core 203
a, 203b, primary coils 201U, 201V, 201
W, the secondary coils 202U, 202V, 202W, the lower frame portion 2 through the rubber material 208 and the spacer 209.
04 and the upper frame portion 205 are sandwiched and fixed. Further, in addition to such a structure, according to the present embodiment, since the wound iron core is adopted as the iron core, the number of joints is small, noise generation in this portion is suppressed, and noise reduction is achieved. To be

In the figure, the lower frame portion 20
Reference numeral 208a provided on the right of the front side of FIG. 4 and 208b provided on the right of the back side (left of the front side) are both ground terminals. In this embodiment, as described above, the ground terminal 20
By providing 8a and 208b on the diagonal line of the transformer, wiring can be easily performed even in a narrow place. 219 of the lower frame portion 204 is a pull hole for attaching a pulling tool or the like when the transformer is moved. By providing such a pull hole, it is possible to improve the efficiency of the moving work.

Also, in the figure, the upper frame portion 20
The left and right cutouts 224 of 5 are hanging ears for lifting,
At the upper part of the rear image of the upper frame portion 205, 221 is a secondary coil 202U, 202V, 202.
A secondary terminal for W and a bar 222 for connection.
Further, what is provided on the left side (on the right side from the front side) on the back side of the lower frame 204 is a contact prevention plate (not shown) provided between the secondary coil 202 and the primary coil 201. ) Ground terminal 215.

Now, the description is returned to FIGS. A rotary type switching tap 210 for switching the connection between each coil and coil layers is provided in the middle of the vertical direction of the secondary coils 202U, 202V, 202W in the figure.
0 is a bar for connection. In addition, the secondary coil 202U,
The primary terminals 211 of the respective primary coils 201U, 201V, 201W are provided on the front upper side of the 202V, 202W. Switching tap 210, terminal 211
Both of them are provided with semi-transparent (including a transparent material that has been smoked) insulating covers 212 and 213.

The shape of the cover of the switching tap 210 is shown in FIG. 10, and the shape of the cover of the terminal 211 is shown in FIG. In both figures, b is a front view, c is a side view, and a is a top view. As shown in FIG. 11, a high voltage danger display 333 is provided on the surface of the cover for the terminal 211 as shown in FIG.

As described above, by providing the insulating covers 212 and 213, it is possible to prevent accidental contact with these bare electric parts. In addition, these insulation covers
By making the 212 and 213 translucent, the tightening state of the switching tap 210 and the terminal 211 can be confirmed from the outside at a glance. Further, unlike the case where the cover is made transparent, the user can be made aware of the presence of the cover and a sense of security can be given.

Here, as shown in FIGS. 8 and 9, in this embodiment, the warning display mark 2 shown in FIG.
14 is attached. As shown in FIG. 12, in this embodiment, in the warning display mark 214, characters and symbols 2141 representing danger and what kind of danger there are,
A sentence 2142 showing what kind of actions are dangerous
And are separated and displayed. In this way, it is possible to expect a safer handling by not only indicating the existence of danger but also clearly indicating the reason and the dangerous behavior.

Now, in such a structure (see FIGS. 8 and 9), in the transformer according to the present embodiment, the primary coil 201 is used.
U, 201V, 201W, secondary coil 202U, 202
V, 202W, Munsell No. It is colored with a bright yellow paint such as 2.5Y8 / 14. In addition, the lower frame portion 204 and the upper frame portion 20
5 and the base unit 206 are Munsell No. It has a dark gray paint color such as N4.0. Winding iron core 20
3a and 203b generally have a color close to black.

The reason why such coloring is applied is as follows.

That is, the primary coil 201U of the transformer,
201V, 201W, secondary coils 202U, 202V,
An insulating layer is formed on the surface of 202W, but it is dangerous to touch it with bare hands because a high voltage is induced on the surface of the insulating layer during operation of the transformer. Therefore, the primary coils 201U, 201V, 201W and the secondary coil 202
U, 202V, and 202W are preferably colored with vivid colors (colors with high saturation) so that they can be recognized and impressed as dangerous. However, on the other hand, transformers are often installed in transformer rooms such as basements. The transformer room generally has an illuminance of 20 lx to 50 lx. (Illumination Society: Lighting Data Book, June 10, 1963, Ohmsha)
And, in such a dim place, the difference in saturation is not a sensation to humans, but rather the difference in luminosity gives a stronger impression to humans. Therefore, in this embodiment, the primary coil 20
1U, 201V, 201W, secondary coil 202U, 20
2V, 202W is colored with yellow, which has a high lightness and saturation and is widely recognized as a color to show danger caution, and the other parts are dark so that yellow can be highlighted even in the dark. I am doing it.

In this embodiment, yellow is 2.5Y8 / 1.
4, N4.0 (gray Munsell display) is used for gray, but the present invention is not limited to this. To make the color contrast of the two parts bigger and more noticeable,
In Munsell display, it is said that the lightness should be 3 to 10 or more and the saturation should be 8 or more (Motoro Kawakami et al .: Encyclopedia of color 1
December 10, 987, Asakura Shoten).

Therefore, as the light color, in addition to the above, the hue is Munsell color solid (or JIS standard color) 5Y, 7.
5Y, 10Y, 2.5GY, 5GY, 7.5GY, 10
Any of GY, 2.5YR, 5YR, 7.5YR, 10YR and the like may be used as a color having a lightness of 7 or more and a saturation of 8 or more. The dark color has a lightness of 4 or less if it is an achromatic color, and has a lightness of 4 or less and a saturation of about 2 if it is a chromatic color, and is preferably a light color and a complementary color.

By thus coloring the iron core and the metal fitting in an achromatic color or a color having a low saturation, the visibility of the molded coil can be improved, and it is possible to prevent accidental touch by an operator, etc. The property is improved.

The reflectance for each lightness is 7 with a lightness of 9.
8.66%, lightness 8 59.1%, lightness 7 43.06
%, Lightness 6 is 30.05%, lightness 5 is 19.77%, lightness 4 is 12.0%, lightness 3 is 6.555%, and lightness 2 is 3.126% (JISZ8721).

Therefore, for example, when a light color with a lightness of 8 and a dark color with a lightness of 4 are combined, the light color reflects about 4.9 times the light of the dark color, and when a lightness of 7 and a lightness of 3 are combined, the light color becomes Dark color about 6.
Reflecting 6 times the light, and combining lightness 9 and lightness 6, the light color reflects about 2.6 times the light of the dark color. By setting the brightness difference to 3 or more in this way, the reflection amount of the bright color can be 2.6 times or more that of the dark color, and the two can be easily distinguished even when installed in a room with low illuminance.

Further, by making the iron core a dark color, the heat dissipation of the iron core is improved by the action of black body radiation.

Colors are generally adjusted in the transformer room and the like, and the walls and ceiling are colored in white or a light chromatic color with a brightness of 8 to 9, and the chromatic color has a saturation of 4 or less. (Illumination Society: Lighting Data Book June 10, 1963,
Therefore, by making the resin mold coil highly saturated, the visibility of the molded coil is improved due to the difference in saturation with the interior wall surface and the like. In addition, since the iron core and the metal fittings are of low brightness color, the presence of the transformer is clarified by forming an edge to make the molded coil part stand out.

Further, the hue of the mold coil is set to 1 from 2.5YR of the hue ring of Munsell color or JIS standard color.
By setting the hue between 0Y, that is, the hue of yellow red or yellow, it is possible to select a color having high brightness (lightness 7 to 8) and high saturation (10 or more). In addition, since these colors are warm colors, they visually act as an expansion color to further raise the molded coil and improve the visibility of the resin molded coil that serves as the charging part, thereby preventing accidental contact with workers. It can be prevented.

If the iron core and the metal fittings are completely black (brightness of 1 or less), the reflectance will be extremely lowered, and the room in which the transformer is installed will be dark. Therefore, it is desirable that the iron core and the metal fittings are dark gray (brightness of about 4 to 2) having an appropriate reflectance.

In this embodiment, the iron core is described as a wound iron core, but if the problem of iron loss is not so important, a laminated iron core may be used instead.

[0061]

According to the present invention, there is provided a transformer having a resin molded coil having a good insulating layer formed thereon, and at the same time, improving safety and easiness of handling. To be

[Brief description of drawings]

FIG. 1 is a vertical cross section of a resin mold coil according to a first embodiment of the present invention.

FIG. 2 is a perspective view of an insulating layer forming base body according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an exploded perspective view of a mold and the like for explaining a method of manufacturing a resin mold coil according to a third embodiment of the present invention.

FIG. 5 is a perspective view showing an assembled state of a mold according to a third embodiment of the present invention.

FIG. 6 is an external view of a resin mold coil manufactured according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a resin mold coil manufactured according to a third embodiment of the present invention.

FIG. 8 is a front side external view of a transformer according to a fourth embodiment of the present invention.

FIG. 9 is a rear side external view of a transformer according to a fourth embodiment of the present invention.

FIG. 10 is a three-view drawing showing a structure of a switching tap cover of a transformer according to a fourth embodiment of the present invention.

FIG. 11 is a trihedral view showing the structure of the primary terminal cover of the transformer according to the fourth embodiment of the present invention.

FIG. 12 is a diagram showing a warning display given to the transformer according to the fourth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... High-voltage resin mold coil, 2 ... Low-voltage resin mold coil, 2c ... Low-voltage coil main body, 3 ... Iron core 10,10c
... High-voltage coil body, 11 ... Conductive wire, 12 ... Interlayer paper, 20,
20c ... Insulating resin layer 21, 21a, 21b, 21
c, 21d ... Insulating layer forming substrate, 22 ... Prepreg sheet (insulating sheet), 22a ... Perforated glass cloth sheet (insulating sheet), 23 ... Glass mat (insulating fiber mat), 23b ... Perforated glass cloth, 24 ... Resin passage, 25 ... Epoxy resin (injection resin), 101 ... Inner mold,
102 ... Outer mold (metal plate), 103 ... Winding coil, 104
... glass mat (contience glass cloth mat), 105 ... casting jig, 106 ... vise (holding jig), 107 ... resin mold coil, 108a ... resin,
108b ... Glass mat impregnated resin, 109 ... Step portion, 1
10 ... Round bar, 111 ... Three-dimensional woven glass cloth, 112 ...
Epoxy resin impregnated portion, 113 ... Glass paper (glass fiber non-woven fabric), 114 ... Sealing glass cloth (plain woven glass cloth prepreg), 115 ... Heat resistant film, 11
6 ... Dimple processed outer die (metal plate), 117 ... Dimple portion, 118 ... Outer die / metal flange (metal plate), 11
9 ... Outer mold / metal flange / radiating plate, 201U, 201
V, 201W ... U phase, V phase, W phase primary coil, 202
U, 202V, 201W ... U phase, V phase, W phase secondary coil, 203a, 203b ... Iron core, 204 ... Lower frame part, 205 ... Upper frame part, 206a, 206b ... Base part, 300 … Anti-vibration rubber

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Izuna Tomoki 46-1, Tomioka, Nakajo-machi, Kitakanbara-gun, Niigata Prefecture 1 Industrial Equipment Division, Hitachi, Ltd. (72) Akira Nakayama Tomioka, Nakajo-machi, Kitakanbara-gun, Niigata Prefecture Address 46, Industrial Equipment Division, Hitachi, Ltd. (72) Inventor Toshiyuki Fujimori, Tomioka, Nakajo-machi, Kitakanbara-gun, Niigata 46 Address 1 Industrial Equipment Division, Hitachi, Ltd.

Claims (4)

[Claims] 1. A resin having a resin-molded coil obtained by molding a coil formed by winding a conductor with a resin, an iron core inserted in the resin-molded coil, and a metal fitting group for fixing the resin-molded coil and the iron core. A mold transformer, wherein the resin mold coil is colored in a light color, and the iron core and the metal fitting group are colored in a dark color. 2. The resin molded coil is colored with a chromatic color having a lightness of 7 or more and a saturation of 8 or more, and the iron core and the metal fitting group are colored with an achromatic color having a lightness of 4 or less. Resin mold transformer. 3. The resin molded coil is colored with a chromatic color having a reflectance of 40% or more, and the iron core and the metal fitting group are colored with an achromatic color having a reflectance of 15% to 3%. The resin mold transformer described. 4. The resin mold coil is colored in a chromatic color of yellow red or yellow between a hue of 2.5YR and a hue of 10Y in a Munsell color solid.
The resin mold transformer described.