JP7569167B2 - Manufacturing method of pleated insulation for stationary induction equipment - Google Patents

Description

SUMMARY OF THE DISCLOSURE An embodiment of the present invention relates to a method for manufacturing pleated insulation in a stationary induction device.

In static induction equipment, such as transformers for high-voltage power receiving and distribution facilities, a resin-molded transformer body is housed in a conductive tank and filled with an insulating cooling medium, such as air or insulating gas. In this case, a connection terminal portion called a bushing is provided to penetrate the outer wall of the tank, and the inner terminal of the connection terminal portion is connected to the lead wire leading out from the transformer body inside the tank. For example, Patent Document 1 discloses that, in order to ensure insulation while preventing the tank from becoming larger, an insulating enclosure made of resin is provided to cover the exposed live portion of the connection portion between the inner terminal of the connection terminal portion and the lead wire.

JP 2019-54204 A

In a configuration in which the connection portion between the connection terminal portion and the lead wire is covered with an insulating enclosure, as in Patent Document 1, it becomes necessary to destroy the insulating enclosure when, for example, the lead wire needs to be disconnected during maintenance. In order to ensure good maintainability, it is not preferable to cover the connection portion between the connection terminal portion and the lead wire, and it is necessary to ensure sufficient insulation even if that portion is left exposed.

Therefore, the present invention provides a method for manufacturing a pleated insulating portion in a stationary induction device that is suitable for manufacturing a stationary induction device that can increase the insulation reliability between the container and the connection portion between the inner terminal and the outlet wire while suppressing an increase in the size of the container .

The stationary induction device to be manufactured by the manufacturing method according to the embodiment includes a container having a connection terminal for connection to the outside, an induction device body housed in the container, a lead wire that is insulated and leads out of the induction device body and has a tip that is electrically connected to an inner terminal of the connection terminal, and a pleated insulating part made of an insulating material and integrally provided so as to extend around the outer periphery of the lead wire. A plurality of the pleated insulating parts are provided in the direction in which the lead wire extends, and the pleated insulating parts are configured to be of equal size or larger on the tip side of the lead wire.

A first aspect of the method for manufacturing a pleated insulation portion in a stationary induction device according to the embodiment is a method for manufacturing the pleated insulation portion in the above-mentioned stationary induction device, in which a flange-shaped member made of an insulating material for constituting the pleated insulation portion is formed in advance, the flange-shaped member is placed on the outer periphery of the lead wire, and the outer periphery of the lead wire is joined to the inner periphery of the flange-shaped member with a resin material, thereby forming the pleated insulation portion.

A second aspect of the method for manufacturing a pleated insulating portion in a stationary induction device according to the embodiment is a method for manufacturing the pleated insulating portion in the stationary induction device, in which a shrinkable insulating tube having the pleated insulating portion on its outer periphery is formed in advance, the shrinkable insulating tube is placed so as to cover the outer periphery of the lead wire, and the shrinkable insulating tube is shrunk to fit tightly against the outer periphery of the lead wire.

A third aspect of the method for manufacturing a pleated insulating portion in a stationary induction device according to the embodiment is a method for manufacturing the pleated insulating portion in the above-mentioned stationary induction device, in which a brim-shaped impregnated base material made of an insulating fiber material for constituting the pleated insulating portion is formed in advance, a tape-shaped impregnated base material made of an insulating fiber material is wound around the outer periphery of the output wire, and the brim-shaped impregnated base material is arranged, and an insulating resin is impregnated into the tape-shaped impregnated base material and the brim-shaped impregnated base material and cured.

FIG. 1 is a front view showing a schematic overall configuration of a transformer according to a first embodiment. Enlarged view of the main part showing how the pleated insulation is formed FIG. 11 is a partial cross-sectional view of a lead wire according to a second embodiment of the present invention. FIG. 13 is a partial cross-sectional view of a lead wire according to a third embodiment. FIG. 13 is a partial cross-sectional view of a lead wire according to a fourth embodiment. FIG. 13 is a partial cross-sectional view of the lead wire according to the fifth embodiment. FIG. 13 is a diagram showing the sixth embodiment, illustrating a state during molding of a molded transformer. FIG. 13 is a cross-sectional view illustrating a seventh embodiment of the present invention, showing a schematic diagram of a lead wire before being impregnated with resin. Schematic cross-sectional view of the lead wire after resin impregnation FIG. 13 is a cross-sectional view showing an eighth embodiment of the present invention, illustrating a schematic configuration of an output wire.

Below, several embodiments of the present invention applied to transformers for high-voltage power distribution equipment will be described with reference to the drawings. Note that parts common to multiple embodiments will be given the same reference numerals and repeated explanations will be omitted.

(1) First embodiment The first embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 shows a schematic configuration of a transformer 1 as a stationary induction device according to this embodiment. This transformer 1 is configured by housing a transformer body 3 as an induction device body in a metal tank 2 as a container. Although not shown in detail, the transformer body 3 is, for example, a molded transformer, configured by winding a coil around an iron core, and the entirety is resin-molded with insulating resin.

Multiple lead wires 4 are led out from the top of the transformer body 3. For convenience, only one lead wire 4 is shown in the figure. Each lead wire 4 is configured with an insulating coating 4a around the conductor and has a connection terminal 5 at its tip. The transformer body 3 is placed on an insulating support 6 and installed in the tank 2. The upper wall of the tank 2 is provided with multiple bushings 7 as connection terminals for connection to the outside. For convenience, only one bushing 7 is shown in the figure. As is well known, this bushing 7 is installed so that the central conductor 9 passes through the center of a porcelain tube 8 that extends vertically through the upper wall.

The upper end of the central conductor 9 is the outer terminal 9a, and the lower end of the central conductor 9 is the inner terminal 9b that protrudes downward from the porcelain tube 8. The connection terminal 5 of the lead wire 4 is electrically connected to the inner terminal 9b. For example, a screw or the like is used as a connection means. The connection portion between the inner terminal 9b and the connection terminal 5 is the live exposed portion, but a so-called shield ring made of a metal sheet and shaped like a ball may be provided to cover the periphery of the inner terminal 9b. The tank 2 is at ground potential. The inside of the tank 2 is sealed and filled with an insulating cooling medium, such as insulating gas or high-pressure air.

The lead wire 4 is integrally provided with a pleated insulating portion 10 made of an insulating material so as to extend around the outer periphery of the insulating coating 4a. In this embodiment, the pleated insulating portion 10 is made of a thermosetting resin, for example, a room temperature curing epoxy resin, and is formed into a circular or ring-shaped thin plate that extends perpendicularly to the direction in which the lead wire 4 extends. The material of the pleated insulating portion 10 may be other thermosetting resins such as urethane resin, or it may be a thermoplastic resin.

In this case, the pleated insulating portion 10 is provided at the tip of the lead wire 4, that is, not on the side closer to the transformer body 3 but on the side closer to the connection terminal 5. Furthermore, in this embodiment, a plurality of pleated insulating portions 10, for example three, are provided side by side with a small gap in the direction in which the lead wire 4 extends. Furthermore, in this embodiment, the plurality of pleated insulating portions 10 are provided with the same size. As shown in FIG. 2, the pleated insulating portions 10 are provided so that the radial width dimension W of the pleated insulating portions 10 is equal to or greater than the radial dimension R including the insulating coating 4a of the lead wire 4, that is, W≧R.

As described in the next section, in this embodiment, the pleated insulation 10 is manufactured by insert molding using a mold 11 as shown in FIG. 2. The mold 11 is a two-part mold that is separated in the diameter direction of the pleated insulation 10, and is arranged so that the tip of the lead wire 4 passes through it when the mold is closed. The mold has cavities 12 corresponding to the three pleated insulations 10. The pleated insulation 10 may be molded during the manufacture of the transformer body 3, or after it is installed in the tank 2 and the connection terminal 5 is connected to the internal terminal 9b.

Next, the action and effect of the above configuration will be described. First, the method of manufacturing the pleated insulating part 10 in this embodiment will be described. As shown in FIG. 2, when forming the pleated insulating part 10, for example, the connection terminal 5 at the tip of the lead wire 4 is connected to the inner terminal 9b of the bushing 7, the die 11 is arranged to sandwich the lead wire 4, and the lead wire 4 is inserted and arranged in the cavity 12. In this state, a resin material is poured into the cavity 12 of the die 11 from the resin injection port 12a. For example, a room temperature curing thermosetting resin is used as the resin material at this time. Specifically, a two-part curing epoxy resin material that cures at room temperature by mixing a base agent and a curing agent is used.

This resin material is poured into the cavity 12 in a two-part mixed state and hardens while integrated with the insulating coating 4a on the outer periphery of the lead wire 4, forming three pleated insulating sections 10. The resin material is then demolded to obtain a lead wire 4 having three pleated insulating sections 10 integrally formed on the outer periphery of its tip. This makes it easy to provide the desired shape, size and number of pleated insulating sections 10 on the outer periphery of the lead wire 4 using a mold 11 having a cavity 12 corresponding to the pleated insulating sections 10.

At this time, the pleated insulation 10 is provided later on the lead wire 4, but since the pleated insulation 10 is provided at the tip end of the lead wire 4, rather than at the base end, the forming of the pleated insulation 10 using the mold 11 can be performed in a position that is easy to work at, ensuring good moldability of the pleated insulation 10. In addition, since there is a greater degree of spatial freedom compared to the base end side of the lead wire 4, it is possible to form a pleated insulation 10 that is sufficiently large, in other words, has a large outer diameter dimension, i.e., a large width dimension W.

In the transformer 1 configured as described above, the connection between the inner terminal 9b of the bushing 7 and the connection terminal 5 of the lead wire 4 in the tank 2 creates an exposed charged portion, and there is a risk that discharge generated from the earth potential of the iron core part of the transformer body 3 or the tank 2 may progress toward the inner terminal 9b along the surface of the transformer body 3 and further along the surface of the lead wire 4. However, in this embodiment, the lead wire 4 is integrally provided with a pleated insulating portion 10 made of an insulating material that extends around the periphery.

Therefore, the pleated insulating portion 10 acts as a barrier to prevent further progress of discharge from progressing along the surface of the lead wire 4 toward the inner terminal 9b portion. This improves the performance of the surface insulation without increasing the creepage distance by enlarging the tank 2, and effectively prevents discharge that occurs on the surface from progressing to the connection portion between the inner terminal 9b, which is the exposed charging portion, and the connection terminal 5 of the lead wire 4. At this time, the pleated insulating portion 10 is formed as a wall that extends vertically to the outer periphery of the lead wire 4, thereby enhancing the barrier properties against discharge and effectively improving insulation.

As described above, the transformer 1 of this embodiment has the excellent effect of improving the insulation reliability between the tank 2 and the connection portion between the inner terminal 9b and the lead wire 4, while suppressing the increase in size of the tank 2. Also, unlike a transformer in which the exposed charging portion is covered with an insulator, the connection and disconnection between the inner terminal 9b and the lead wire 4 can be easily performed without destroying the insulator, ensuring good maintainability. In particular, in this embodiment, by providing multiple pleated insulating portions 10, the insulation performance can be improved compared to the case where only one is provided.

(2) Second embodiment Fig. 3 shows a second embodiment, which shows the lead wire 21 of the transformer body 3. The second embodiment differs from the first embodiment in the configuration of the pleated insulating portion provided on the outer periphery of the insulating coating 21a of the lead wire 21. That is, in this embodiment, a plurality of, for example, three pleated insulating portions 22, 23, 24 are integrally provided on the tip of the lead wire 21, and the pleated insulating portions 22, 23, 24 are configured so that the pleated insulating portions 22, 23, 24 located on the tip side of the lead wire 21 are larger. In this case, the pleated insulating portion 24 on the base end side has the smallest outer dimension, and the width dimension W in the radial direction is set to be equal to or larger than the radius dimension R of the lead wire 21. The pleated insulating portion 23 in the middle has an intermediate outer dimension, and the pleated insulating portion 22 at the tip has the largest outer dimension.

In this case, the pleated insulating portions 22, 23, 24 are formed by insert molding using a metal mold, for example, as in the first embodiment. According to the second embodiment, like the first embodiment, it is possible to obtain effects such as increasing the insulation reliability between the tank 2 and the connection portion between the inner terminal 9b and the lead wire 21, while suppressing the increase in size of the tank 2. In particular, in this embodiment, by making the tip side of the multiple pleated insulating portions 22, 23, 24 larger, it is possible to further improve performance, and also to improve manufacturability compared to the opposite case.

(3) Third embodiment Fig. 4 shows a third embodiment, illustrating the lead wire 31 of the transformer body 3. The third embodiment differs from the first and second embodiments in the configuration of pleated insulating parts 32 that are integrally provided on the outer periphery of the insulating coating 31a of the lead wire 31. That is, the pleated insulating parts 32 are located at the tip of the lead wire 31, and a plurality of pleated insulating parts 32, for example, three pleated insulating parts 32, are provided side by side with equal sizes. In this embodiment, each pleated insulating part 32 is formed by joining a flange-shaped member 32a made of an insulating material to the outer periphery of the insulating coating 31a with an insulating resin material 33.

Specifically, the method for manufacturing the pleated insulating portion 32 involves forming a flange-shaped member 32a in advance, for example by resin molding, separately from the lead wire 31. At this time, the flange-shaped member 32a is made of a synthetic resin, for example a phenolic resin, and is configured in a thin ring shape with an inner diameter that fits the outer periphery of the lead wire 31 and an outer diameter whose radial width dimension W is equal to or greater than the radius dimension R of the lead wire 31. This flange-shaped member 32a is placed on the outer periphery of the lead wire 31, and its inner periphery is joined to the outer periphery of the lead wire 31 by a resin material 33, for example an epoxy resin.

According to the third embodiment, as in the first embodiment, the effect of improving the insulation reliability between the tank 2 and the connection part between the inner terminal 9b and the lead wire 31 can be obtained while suppressing the increase in size of the tank 2. According to the manufacturing method of the pleated insulating part 32 of this embodiment, the flange-shaped member 32a can be easily formed in various sizes, thicknesses, and materials without using large-scale equipment to form the flange-shaped member 32a. The pleated insulating part 32 can be formed very simply by joining the preformed flange-shaped member 32a to the lead wire 31. Since the resin material 33 is filled between the outer peripheral surface of the lead wire 31 and the inner peripheral part of the flange-shaped member 32a, the insulation at the boundary between them can be ensured, and the progress of discharge at the boundary can be prevented in advance.

(4) Fourth embodiment Fig. 5 shows a fourth embodiment, which shows the lead wire 41 of the transformer body 3. The fourth embodiment differs from the first to third embodiments in the configuration of the pleated insulating parts 42 that are integrally provided on the outer periphery of the insulating coating 41a of the lead wire 41. That is, in this embodiment, the three pleated insulating parts 42 are, for example, integrally provided on the outer periphery of a cylindrical shrinkable insulating tube 43. In this case, the insulating shrinkable tube 43 is made of a cold shrinkable material, and specifically, the shrinkable insulating tube 43 and the pleated insulating parts 42 are made of a rubber-based material such as silicone rubber or EP rubber. Incidentally, the shrinkable insulating tube 43 may be, for example, "Cold Shrinkable Tube (registered trademark)" manufactured by 3M Japan Ltd.

When providing the lead wire 41 with the pleated insulating portion 42, a shrinkable insulating tube 43 is formed in advance with the pleated insulating portion 42 integrally formed on the outer periphery. Then, with the large-diameter tube state of the shrinkable insulating tube 43 maintained by a spiral core (not shown), the shrinkable insulating tube 43 is placed to cover the outer periphery of the lead wire 41. After this, the spiral core is pulled out, causing the shrinkable insulating tube 43 to shrink, and the shrinkable insulating tube 43 with the three pleated insulating portions 42 that extend outward is tightly and firmly fixed to the outer periphery of the lead wire 41.

According to the fourth embodiment, as in the first embodiment, it is possible to obtain an effect of improving the insulation reliability between the tank 2 and the connection part between the inner terminal 9b and the lead wire 41 while suppressing the size of the tank 2. According to the manufacturing method of the pleated insulating part 42 of this embodiment, the shrinkable insulating tube 43 having the pleated insulating part 42 can be formed separately, and it is possible to relatively easily form the shrinkable insulating tube 43 having the pleated insulating part 42 of various sizes, thicknesses, and numbers without becoming large-scale. By covering the outer periphery of the lead wire 41 with the shrinkable insulating tube 43 and shrinking it, the pleated insulating part 42 can be provided on the outer periphery of the lead wire 41, and the pleated insulating part 42 can be easily formed. In particular, in this embodiment, the insulating shrinkable tube 43 is made of a material that shrinks at room temperature, and the shrinking process is performed at room temperature, so that the pleated insulating part 42 can be easily and inexpensively provided on the outer periphery of the lead wire 41 without requiring large energy or large-scale equipment.

(5) Fifth embodiment Fig. 6 shows a lead wire 51 according to a fifth embodiment. In this fifth embodiment, as in the fourth embodiment, a shrinkable insulating tube 43 having a pleated insulating portion 42 on the outer periphery is arranged to cover the outer periphery of the lead wire 51, and the shrinkable insulating tube 43 is shrunk. At this time, a self-adhesive insulating tape 52 having self-adhesive properties is wound in advance around the outer periphery of the insulating coating 51a of the lead wire 51 at a position where the shrinkable insulating tube 43 is to be arranged. As the self-adhesive insulating tape 52, for example, one having a polyethylene base material and a rubber-based adhesive is commercially available, and "Fit Tape" manufactured by 3M Japan Ltd. can be used.

In this embodiment, the self-adhesive insulating tape 52 is wound around the outer periphery of the lead wire 51, and the shrinkable insulating tube 43 is placed in an expanded state so as to cover the outer periphery of the lead wire 51, and the spiral core is pulled out to shrink the shrinkable insulating tube 43. As a result, the shrinkable insulating tube 43 having three pleated insulating portions 42 that expand to the outer periphery is firmly fixed to the outer periphery of the lead wire 51. In addition to obtaining the same effect as the fourth embodiment, the self-adhesive insulating tape 52 allows the joint between the shrinkable insulating tube 43 and the lead wire 51 to be more firmly joined, and the insulation at the joint between them can be further improved.

(6) Sixth embodiment Fig. 7 shows a sixth embodiment, and shows a schematic view of a molded transformer body 61 as an induction device body according to this embodiment when it is resin molded. The molded transformer body 61 has a lead wire 63 led out from a winding main part 62 formed by winding a coil around an iron core, and the whole is molded with an insulating resin made of a thermosetting resin such as epoxy resin, and a molded resin layer 64 is formed. At this time, an insulating coating 63a is provided integrally with the molded resin layer 64 on the outer periphery of the conductor of the lead wire 63. At the same time, a plurality of, for example, three pleated insulating parts 65 are provided integrally with the molded resin layer 64 on the outer periphery of the tip of the lead wire 63.

In this embodiment, in the resin molding process, the winding main part 62 and the lead wire 63 are placed in a cavity 67 of a mold 66. The cavity 67 corresponds to the overall external shape of the molded transformer body 61, and also to the external shapes of the insulating coating 63a and pleated insulating part 65 on the outer periphery of the lead wire 63. In the resin molding process, as shown in the figure, a thermosetting resin is poured into the cavity 67 of the mold 66 from an injection port 67a, and when hardened, the insulating coating 63a and pleated insulating part 65 on the outer periphery of the lead wire 63 are integrally molded together with the molded resin layer 64.

According to the sixth embodiment, as in the first embodiment, it is possible to obtain effects such as increasing the insulation reliability between the tank 2 and the connection portion between the inner terminal 9b and the lead wire 63 while suppressing the increase in size of the tank 2. Furthermore, since the insulating coating 63a of the lead wire 63 and the pleated insulating portion 65 are integrally molded into the molded resin layer 64 during resin molding, a separate process for forming the pleated insulating portion is not required, and the process can be simplified. Furthermore, since the pleated insulating portion 65 is integral with the insulating coating 63a of the lead wire 63, the insulating performance can be further improved.

(7) Seventh embodiment Figures 8 and 9 show the seventh embodiment. In this embodiment, as shown in Figure 9, the lead wire 71 is configured to have an insulating coating 72 on the outer periphery of the conductor 71a and a plurality of, for example, three, pleated insulating parts 73 located at the tip. At this time, the insulating coating 72 is configured by impregnating an insulating resin 75 such as epoxy resin into a tape-shaped impregnated base material 74 made of an insulating fiber material wound around the outer periphery of the conductor 71a and hardening the insulating resin 75. The tape-shaped impregnated base material 74 is wound while wrapping it at half pitches. The pleated insulating parts 73 are configured by impregnating an insulating resin 75 such as epoxy resin into a thin plate ring-shaped brim-shaped impregnated base material 76 made of an insulating fiber material and hardening the insulating resin 75.

In this case, three flange-shaped impregnated base materials 76 made of insulating fiber material for forming the pleated insulating portion 73 are formed in advance, and the tape-shaped impregnated base material 74 is wound around the outer circumference of the conductor 71a that constitutes the lead wire 71. Then, as shown in FIG. 8, each flange-shaped impregnated base material 76 is arranged so as to fit onto the outer circumference of the tape-shaped impregnated base material 74. Then, from this state, both the tape-shaped impregnated base material 74 and the flange-shaped impregnated base material 76 are impregnated with insulating resin 75 and hardened to obtain the lead wire 71 having the insulating coating 72 and three pleated insulating portions 73 in an integrated form as shown in FIG. 9.

According to the seventh embodiment, as in the first embodiment, it is possible to obtain effects such as increasing the insulation reliability between the tank 2 and the connection portion between the inner terminal 9b and the lead wire 71 while suppressing the increase in size of the tank 2. The insulating coating 72 and the pleated insulating portion 73 of the lead wire 71 are made of a composite insulating material made of a fiber material and an insulating resin, and since they are integrated, it is possible to easily form the insulating coating 72 and the pleated insulating portion 73 with high insulating performance.

(8) Eighth embodiment and other embodiments Fig. 10 shows an eighth embodiment. In this embodiment, as in the seventh embodiment, the lead wire 81 is provided with an insulating coating 82 on the outer periphery of the conductor 81a and is provided with a plurality of, for example, three pleated insulating parts 83 located at the tip. In this case, the insulating coating 82 is formed by impregnating a tape-shaped impregnated base material 84 made of an insulating fiber material wound around the outer periphery of the conductor 81a with an insulating resin 85 such as epoxy resin and curing the same, and the pleated insulating parts 83 are formed by impregnating a thin plate ring-shaped brim-shaped impregnated base material 86 made of an insulating fiber material with an insulating resin 85 such as epoxy resin and curing the same.

The eighth embodiment differs from the seventh embodiment in that the inner periphery of the flange-shaped impregnated base material 86 is embedded in the layer of the tape-shaped impregnated base material 84 on the outer periphery of the lead wire 81. In this case, the center hole of the flange-shaped impregnated base material 86 is configured to have a small diameter dimension corresponding to the outer diameter of the conductor 81a. Then, the flange-shaped impregnated base material 86 is first fitted and placed on the outer periphery of the conductor 81a, for example, and then the tape-shaped impregnated base material 84 is wound, and then the insulating resin 85 is impregnated and hardened. This achieves the effects of the seventh embodiment, and further improves the insulating performance by more firmly integrating the insulating coating 82 portion of the lead wire 81 with the pleated insulating portion 83.

In the above-mentioned embodiments, the pleated insulating portion is configured to be disk-shaped, but it may be configured to be square or polygonal. The number of pleated insulating portions is not limited to three, and it may be only one, or even two, four or more. The pleated insulating portion may be arranged in an umbrella shape that is slightly inclined from the perpendicular, rather than perpendicular to the direction in which the lead wire extends. In addition, the materials of each part, such as the insulating resin, are merely examples, and various materials can be used, such as using thermoplastic resin instead of thermosetting resin. For example, the flange-shaped member in the third embodiment can be made of ceramic. The shrink insulating tube in the fourth and fifth embodiments can be made of a heat-shrinkable material and configured to shrink when heated.

In addition, various modifications are possible to the specific configuration of the entire transformer, and the static induction device is not limited to a transformer, but can also be applied to, for example, a reactor. The several embodiments described above are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

In the drawings, 1 is a transformer (static induction device), 2 is a tank (container), 3 is a transformer body (induction device body), 4, 21, 31, 41, 51, 63, 71, 81 are lead wires, 4a, 21a, 31a, 41a, 51a, 63a, 72, 82 are insulating coatings, 5 is a connection terminal, 7 is a bushing (connection terminal portion), 9b is an inner terminal, 10, 22, 23, 24, 32, 42, 65, 73, 83 are pleated insulating portions, 11 is a mold, 32a is a flange-shaped member, 33 is a resin material, 43 is a shrinkable insulating tube, 52 is a self-fusing insulating tape, 61 is a molded transformer body (induction device body), 64 is a molded resin layer, 66 is a mold, 74, 84 are tape-shaped impregnated substrates, 75, 85 are insulating resins, and 76, 86 are flange-shaped impregnated substrates.

Claims (6)

a container having a connection terminal portion for connection to an outside;
An induction device main body accommodated in the container;
a lead wire that is insulated and is led out of the induction device body and has a tip that is electrically connected to an inner terminal of the connection terminal portion;
a pleated insulating portion made of an insulating material and integrally provided so as to extend around the outer periphery of the lead wire ,
A method for manufacturing the pleated insulating portion in a stationary induction device in which a plurality of the pleated insulating portions are provided in a direction in which the lead wires extend, and the pleated insulating portions are configured to be equal in size or larger than one located at a tip end of the lead wires , the method comprising:
A manufacturing method for a pleated insulation portion in a stationary induction device, in which a flange-shaped member made of an insulating material for constituting the pleated insulation portion is formed in advance, the flange-shaped member is placed on the outer periphery of the lead wire, and the outer surface of the lead wire and the inner periphery of the flange-shaped member are joined with a resin material to form the pleated insulation portion. a container having a connection terminal portion for connection to an outside;
An induction device main body accommodated in the container;
a lead wire that is insulated and is led out of the induction device body and has a tip that is electrically connected to an inner terminal of the connection terminal portion;
a pleated insulating portion made of an insulating material and integrally provided so as to extend around the outer periphery of the lead wire,
A method for manufacturing the pleated insulating portion in a stationary induction device in which a plurality of the pleated insulating portions are provided in a direction in which the lead wires extend, and the pleated insulating portions are configured to be equal in size or larger than one located at a tip end of the lead wires, the method comprising:
A method for manufacturing a pleated insulating portion in a stationary induction device, comprising the steps of: forming a shrinkable insulating tube having the pleated insulating portion on its outer periphery in advance; arranging the shrinkable insulating tube to cover the outer periphery of the lead wire; and shrinking the shrinkable insulating tube to fit closely to the outer periphery of the lead wire. 3. The method for manufacturing a pleated insulating portion for a stationary induction device according to claim 2, wherein the shrinkable insulating tube is made of a cold shrinkable material, and the shrinking process is carried out at room temperature. 4. The method for manufacturing a pleated insulating portion for a stationary induction device according to claim 2, wherein a self-adhesive insulating tape is wound around the outer periphery of the lead wire in a portion where the shrinkable insulating tube is disposed. a container having a connection terminal portion for connection to an outside;
An induction device main body accommodated in the container;
a lead wire that is insulated and is led out of the induction device body and has a tip that is electrically connected to an inner terminal of the connection terminal portion;
a pleated insulating portion made of an insulating material and integrally provided so as to extend around the outer periphery of the lead wire,
A method for manufacturing the pleated insulating portion in a stationary induction device in which a plurality of the pleated insulating portions are provided in a direction in which the lead wires extend, and the pleated insulating portions are configured to be equal in size or larger than one located at a tip end of the lead wires , the method comprising:
A manufacturing method for a pleated insulation portion in a stationary induction device, comprising the steps of: forming in advance a flange-shaped impregnated base material made of an insulating fiber material for constituting the pleated insulation portion; winding a tape-shaped impregnated base material made of an insulating fiber material around the outer periphery of the output wire; and positioning the flange-shaped impregnated base material; and impregnating and curing the tape-shaped impregnated base material and the flange-shaped impregnated base material with insulating resin. 6. The method for producing a pleated insulating portion for a stationary induction device according to claim 5, wherein the inner peripheral portion of the flange-shaped impregnated base material is embedded in the layer of the tape-shaped impregnated base material on the outer periphery of the lead wire.

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