JP2021190620A - Static induction device and manufacturing method of pleated insulation unit in static induction device - Google Patents

Abstract

To provide a static induction device with improved insulation reliability between a connection portion between an inner terminal and a lead wire and a container while suppressing an increase in size of the container, and a manufacturing method of a pleated insulation unit in the static induction device.SOLUTION: A static induction device 1 includes a container 2 having a connection terminal 7 for connection with the outside, an induction device body 3 housed in the container 2, a lead wire 4 that is derived from the induction device body 3 with an insulation coating 4a applied, has a connection terminal 5 at the tip, and is electrically connected to an inner terminal 9b of the connection terminal 7, and a pleated insulation unit 10 made of an insulating material integrally provided so as to extend to the outer circumference of the lead wire 4.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a static induction device and a method for manufacturing a pleated insulating portion in the static induction device.

In a static induction device, for example, a transformer for high-voltage power receiving and distribution equipment, a resin mold type transformer body is housed in a conductive tank, and an insulating cooling medium such as air or insulating gas is contained therein. It is known that it is enclosed and configured. At this time, a connection terminal portion called a bushing is provided so as to penetrate the outer wall of the tank, and the inner terminal of the connection terminal portion and the lead wire led out from the transformer main body are connected in the tank. To. Then, for example, in Patent Document 1, in order to secure insulation while suppressing the increase in size of the tank, resin insulation is provided so as to cover the charge-exposed portion of the connection portion between the inner terminal of the connection terminal portion and the lead wire. It is disclosed to provide a siege.

Japanese Unexamined Patent Publication No. 2019-5204

In the configuration in which the connection portion between the connection terminal portion and the lead wire is covered with the insulating surrounding portion as in Patent Document 1, it becomes necessary to destroy the insulating surrounding portion when the connection of the lead wire is temporarily disconnected at the time of 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 required to secure sufficient insulation even if the portion remains exposed.

Therefore, it is suitable for manufacturing a static induction device capable of increasing the insulation reliability between the connection portion between the inner terminal and the lead wire and the container while suppressing the increase in size of the container, and the static induction device thereof. Provided is a method for manufacturing a fold-shaped insulating portion in a static induction device.

The stationary induction device according to the embodiment is derived from the induction device main body with a container having a connection terminal portion for connection with the outside, the induction device main body housed in the container, and an insulating coating. It includes a lead wire whose tip is electrically connected to the inner terminal of the connection terminal portion, and a fold-shaped insulating portion made of an insulating material integrally provided so as to extend to the outer periphery of the lead wire.

The first aspect of the method for manufacturing a pleated insulating portion in a static induction device according to an embodiment is a method for manufacturing the pleated insulating portion in the static guiding device, and the lead wire is formed in a mold. Is inserted and arranged, an insulating resin is injected into the cavity in the mold, and the pleated insulating portion is integrally molded on the outer peripheral portion of the lead wire.

The second aspect of the method for manufacturing the fold-shaped insulating portion in the static induction device according to the embodiment is a method for manufacturing the fold-shaped insulating portion in the static induction device, and constitutes the fold-shaped insulating portion. A flange-shaped member made of an insulating material is formed in advance, the flange-shaped member is arranged on the outer periphery of the lead wire, and the space between the outer peripheral surface of the lead wire and the inner peripheral portion of the flange-shaped member is formed. The pleated insulating portion is formed by joining with a resin material.

A third aspect of the method for manufacturing a pleated insulating portion in the static induction device according to the embodiment is a method for manufacturing the pleated insulating portion in the static guiding device, and the pleated insulating portion is provided on the outer peripheral portion. A shrink-insulating tube provided with a portion is formed in advance, the shrink-insulating tube is arranged so as to cover the outer periphery of the lead wire, and the shrink-insulating tube is contracted so as to be brought into close contact with the outer periphery of the lead wire.

A fourth aspect of the method for manufacturing a pleated insulating portion in a static induction device according to an embodiment is a method for manufacturing the pleated insulating portion in the static induction device, wherein the guiding device main body is made of gold. It is composed of a mold transformer configured by resin-molding the whole using a mold, and at the time of the resin molding, the insulating coating of the lead wire and the pleated insulating portion are integrally molded.

A fifth aspect of the method for manufacturing a fold-shaped insulating portion in a static induction device according to an embodiment is a method for manufacturing the fold-shaped insulating portion in the static induction device, which constitutes the fold-shaped insulating portion. A collar-shaped impregnated base material made of an insulating fiber material is formed in advance, and a tape-shaped impregnated base material made of an insulating fiber material is wound around the outer periphery of the lead wire, and the collar-shaped impregnated base material is wound. An impregnated base material is arranged, and the tape-shaped impregnated base material and the flange-shaped impregnated base material are impregnated with an insulating resin and cured.

The front view which shows the 1st Embodiment and shows the whole structure of a transformer schematicly. Enlarged view of the main part showing the state at the time of forming the pleated insulating part The figure which shows the 2nd Embodiment, and shows the opening line in a partial cross section. The figure which shows the 3rd Embodiment, and shows the opening line in a partial cross section. The figure which shows the 4th Embodiment, and shows the opening line in a partial cross section. The figure which shows the 5th Embodiment, and shows the opening line in a partial cross section. The figure which shows the 6th Embodiment and shows the state at the time of molding of a mold transformer. FIG. 7 is a cross-sectional view schematically showing a lead wire before impregnation with resin, which shows a seventh embodiment. Cross-sectional view schematically showing the lead wire after resin impregnation 8th embodiment is shown, and is a cross-sectional view schematically showing a lead line.

Hereinafter, some embodiments applied to the transformer for high voltage power receiving and distribution equipment will be described with reference to the drawings. It should be noted that the parts common to the plurality of embodiments are designated by the same reference numerals, and the repeated description will be omitted.

(1) First Embodiment The first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 schematically shows the configuration of a transformer 1 as a static induction device according to the present embodiment. The transformer 1 is configured by accommodating a transformer main body 3 as an inductive device main body in a metal tank 2 as a container. Although not shown in detail, the transformer main body 3 is made of, for example, a molded transformer, is configured by winding a coil around an iron core, and is entirely resin-molded with an insulating resin.

A plurality of lead wires 4 are derived from the upper part of the transformer main body 3. In the figure, for convenience, only one lead wire 4 is shown. Each lead wire 4 is configured by providing an insulating coating 4a around the conducting wire, and has a connection terminal 5 at the tip thereof. The transformer main body 3 is installed in the tank 2 in a form of being placed on the insulating support 6. The upper wall portion of the tank 2 is provided with a plurality of bushings 7 as connection terminal portions for connecting to the outside. In the figure, for convenience, only one bushing 7 is shown. As is well known, the bushing 7 is provided so that the central conductor 9 penetrates the central portion of the porcelain tube 8 extending vertically through the upper wall portion.

At this time, 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 protruding downward from the porcelain tube 8. The connection terminal 5 of the lead wire 4 is electrically connected to the inner terminal 9b. As the connecting means at this time, for example, screwing or the like is adopted. The connection portion between the inner terminal 9b and the connection terminal 5 is a charge-exposed portion, but a so-called shield ring formed in a ball shape from a thin metal plate may be provided so as to cover the periphery of the inner terminal 9b. The tank 2 has a ground potential. Further, the inside of the tank 2 is hermetically sealed, and an insulating cooling medium such as an insulating gas or high-pressure air is enclosed.

By the way, the lead wire 4 is integrally provided with a pleated insulating portion 10 made of an insulating material so as to extend to the outer periphery of the insulating coating 4a. In the present embodiment, the fold-shaped insulating portion 10 is formed of a thermosetting resin, for example, a room temperature curable epoxy resin, into a circular or ring-shaped thin plate extending in a direction perpendicular to the extending direction of the lead wire 4. There is. The material of the fold-shaped insulating portion 10 may be another thermosetting resin such as urethane resin, or may be a thermoplastic resin.

At this time, the pleated insulating portion 10 is provided at the tip end portion of the lead wire 4, that is, not on the side close to the transformer main body 3, but on the side close to the connection terminal 5. Further, in the present embodiment, a plurality of, for example, three pleated insulating portions 10 are provided side by side with a slight gap in the extending direction of the lead wire 4. Further, in the present embodiment, the plurality of pleated insulating portions 10 are provided with the same size. As shown in FIG. 2, in the fold-shaped insulating portion 10, the width dimension W in the radial direction of the fold-shaped insulating portion 10 is equal to or larger than the radial dimension R including the insulating coating 4a of the lead wire 4. That is, it is provided so that W ≧ R.

Then, as described in the following description of the operation, in the present embodiment, as a manufacturing method for manufacturing the pleated insulating portion 10, so-called insert molding using a mold 11 as shown in FIG. 2 is adopted. To. The mold 11 is composed of a two-divided mold separated in the diameter direction of the fold-shaped insulating portion 10, is arranged so that the tip of the lead wire 4 penetrates in the mold-clamped state, and has three folds. It has a cavity 12 corresponding to the insulating portion 10. The pleated insulating portion 10 may be molded at the time of manufacturing the transformer main body 3 or after being installed in the tank 2 and connecting the connection terminal 5 to the internal terminal 9b.

Next, the action and effect of the above configuration will be described. First, a method of manufacturing the pleated insulating portion 10 in the present embodiment will be described. As shown in FIG. 2, when forming the fold-shaped insulating portion 10, for example, in a state where the connection terminal 5 at the tip of the lead wire 4 is connected to the inner terminal 9b of the bushing 7, the metal is sandwiched between the lead wires 4. It is assumed that the mold 11 is arranged and the lead wire 4 is inserted and arranged in the cavity 12. In this state, the resin material is cast into the cavity 12 of the mold 11 from the resin injection port 12a. As the resin material at this time, for example, a room temperature curing type thermosetting resin is adopted, and specifically, a two-component curing type epoxy resin that cures at room temperature by mixing a main agent and a curing agent. The material is used.

This resin material is cast into the cavity 12 in a mixed state of the two liquids, and is cured in a state of being integrated with the insulating coating 4a on the outer periphery of the lead wire 4, whereby the three fold-shaped insulating portions 10 are formed. It is formed. After that, by releasing the mold, a lead wire 4 having three pleated insulating portions 10 integrally on the outer periphery of the tip portion can be obtained. Thereby, by using the mold 11 having the cavity 12 corresponding to the pleated insulating portion 10, it is possible to easily provide the pleated insulating portion 10 having a desired shape, size, and number on the outer peripheral portion of the lead wire 4. can.

At this time, the fold-shaped insulating portion 10 may be provided later with respect to the lead wire 4, but the fold-shaped insulating portion 10 is provided at the tip end portion of the lead-out wire 4 instead of the base end side. Therefore, the work of forming the pleated insulating portion 10 using the mold 11 can be performed at a position where it is easy to work, and good formability of the pleated insulating portion 10 can be ensured. Further, since the degree of freedom in space is larger than that on the base end side of the lead wire 4, it is possible to form a fold-shaped insulating portion 10 having a sufficiently large outer diameter dimension, that is, a width dimension W.

In the transformer 1 having the above configuration, the charging exposed portion is generated by connecting the inner terminal 9b of the bushing 7 and the connection terminal 5 of the lead wire 4 in the tank 2, for example, the transformer main body. The discharge generated from the ground potential of the iron core portion 3 or the tank 2 or the like may propagate toward the inner terminal 9b portion along the surface of the transformer main body 3 and the surface of the lead wire 4. However, in the present embodiment, the lead wire 4 is integrally provided with a pleated insulating portion 10 made of an insulating material so as to extend to the outer periphery.

Therefore, the fold-shaped insulating portion 10 functions as a barrier to prevent further discharge from the discharge that propagates on the surface of the lead wire 4 toward the inner terminal 9b portion. Therefore, it is possible to improve the creepage insulation performance without increasing the creepage distance by increasing the size of the tank 2, and the discharge generated along the creepage is the connection terminal 5 between the inner terminal 9b which is the charge exposed portion and the lead wire 4. It can be effectively prevented from extending to the connection portion with. At this time, since the pleated insulating portion 10 is formed as a wall that extends vertically to the outer peripheral side of the lead wire 4, it is effective in enhancing the barrier property against electric discharge and improving the insulating property.

As described above, according to the transformer 1 of the present embodiment, while suppressing the increase in size of the tank 2, the insulation reliability between the connection portion between the inner terminal 9b and the lead wire 4 and the tank 2 is improved. You can get the excellent effect of being able to. Further, unlike the case where the charged exposed portion is covered with an insulator, the inner terminal 9b and the lead wire 4 can be easily connected and disconnected without damaging the insulator, ensuring good maintainability. be able to. In particular, in the present embodiment, by providing a plurality of pleated insulating portions 10, the insulating performance can be further improved as compared with the case of one.

(2) Second Embodiment FIG. 3 shows a second embodiment, and shows a lead wire 21 of a transformer main body 3. This 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 the present embodiment, a plurality of, for example, three pleated insulating portions 22, 23, 24 are integrally provided at the tip of the lead wire 21, but the plurality of pleated insulating portions 22, 23, 23 are integrally provided. , 24 are configured to be larger on the tip side of the lead wire 21. At this time, the fold-shaped insulating portion 24 on the base end side has the smallest external dimension, and the width dimension W in the radial direction is set to be equal to or greater than the radius dimension R of the lead wire 21. The pleated insulating portion 23 in the middle has an intermediate external dimension, and the pleated insulating portion 22 at the tip has the largest external dimension.

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

(3) Third Embodiment FIG. 4 shows a third embodiment, and shows a lead wire 31 of a transformer main body 3. The third embodiment differs from the first and second embodiments in the configuration of the fold-shaped insulating portion 32 integrally provided on the outer periphery of the insulating coating 31a of the lead wire 31. That is, the pleated insulating portion 32 is located at the tip end portion of the lead wire 31, and a plurality of, for example, three fold-shaped insulating portions 32 are provided side by side in the same size. In the present embodiment, each pleated insulating portion 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.

As a method for manufacturing the pleated insulating portion 32, specifically, a flange-shaped member 32a is previously formed by, for example, resin molding, separately from the lead wire 31. At this time, the flange-shaped member 32a is made of a synthetic resin such as phenol resin, and the inner diameter is fitted to the outer circumference of the lead wire 31, and the outer diameter is the same as the radial width dimension W with respect to the radial dimension R of the lead wire 31. It is configured in the shape of a thin plate ring as described above. The flange-shaped member 32a is arranged on the outer periphery of the lead wire 31, and the inner peripheral portion thereof is joined to the outer peripheral surface of the lead wire 31 by, for example, a resin material 33 made of an epoxy resin.

According to the third embodiment as described above, similarly to the first embodiment and the like, the connection portion between the inner terminal 9b and the lead wire 31 and the tank 2 are connected while suppressing the increase in size of the tank 2. It is possible to obtain effects such as increasing the insulation reliability between the two. According to the method for manufacturing the pleated insulating portion 32 of the present embodiment, the brim-shaped member 32a of various sizes, thicknesses, and materials can be easily formed without using large-scale equipment for forming the brim-shaped member 32a. can do. By joining the flange-shaped member 32a formed in advance to the lead wire 31, the pleated insulating portion 32 can be formed extremely easily. Since the outer peripheral surface of the lead wire 31 and the inner peripheral portion of the flange-shaped member 32a are filled with the resin material 33, the insulating property at the boundary portion thereof can be ensured, and the discharge progresses at the boundary portion. It is possible to prevent it from happening.

(4) Fourth Embodiment FIG. 5 shows a fourth embodiment, and shows a lead wire 41 of a transformer main body 3. The fourth embodiment differs from the first to third embodiments in the configuration of the fold-shaped insulating portion 42 integrally provided on the outer periphery of the insulating coating 41a of the lead wire 41. That is, in the present embodiment, the three pleated insulating portions 42 are integrally provided on the outer periphery of the cylindrical shrinkable insulating tube 43, for example. In this case, the insulating shrinkable tube 43 is made of a room temperature shrinkable material, and specifically, the shrinking insulating tube 43 and the fold-shaped insulating portion 42 are made of a rubber-based material such as silicone rubber or EP rubber. ing. Incidentally, as the shrinkable insulating tube 43, for example, "normal temperature shrinkable tube (registered trademark)" manufactured by 3M Japan Ltd. can be adopted.

In providing the fold-shaped insulating portion 42 on the lead wire 41, a shrinkable insulating tube 43 integrally provided with the fold-shaped insulating portion 42 is formed in advance on the outer peripheral portion. Then, while the large-diameter tube state of the contractile insulating tube 43 is maintained by the spiral core (not shown), the contractile insulating tube 43 is arranged so as to cover the outer periphery of the lead wire 41. After that, by pulling out the spiral core, the shrinkable insulating tube 43 contracts, and the shrinkable insulating tube 43 having three pleated insulating portions 42 extending to the outer peripheral surface on the outer peripheral surface of the lead wire 41 is strongly strengthened. It is closely fixed.

According to the fourth embodiment as described above, similarly to the first embodiment and the like, the connection portion between the inner terminal 9b and the lead wire 41 and the tank 2 are connected to each other while suppressing the increase in size of the tank 2. It is possible to obtain effects such as increasing the insulation reliability between the two. Further, according to the method for manufacturing the pleated insulating portion 42 of the present embodiment, the shrinkable insulating tube 43 having the pleated insulating portion 42 can be separately formed, and can be of various sizes, thicknesses, and number of sheets without becoming large. The shrinkable insulating tube 43 provided with the pleated insulating portion 42 can be formed relatively easily. By covering the outer periphery of the lead wire 41 with the shrinkable insulating tube 43 and shrinking it, the fold-shaped insulating portion 42 can be provided on the outer peripheral portion of the lead wire 41, and the fold-shaped insulating portion 42 can be easily formed. .. In particular, in the present embodiment, the insulating shrink tube 43 is made of a room temperature shrinkable material, and the shrinking process is performed at room temperature. A fold-shaped insulating portion 42 can be provided on the outer peripheral portion.

(5) Fifth Embodiment FIG. 6 shows a lead wire 51 according to the fifth embodiment. In the fifth embodiment, similarly to the fourth embodiment, the shrinkable insulating tube 43 having the fold-shaped insulating portion 42 on the outer peripheral portion is arranged so as to cover the outer peripheral portion of the lead wire 51, and the shrinkable insulating tube is arranged. 43 is contracted. At that time, the self-bonding insulating tape 52 having self-bonding property is wound in advance on the outer periphery of the insulating coating 51a of the lead wire 51 at a portion where the shrinkable insulating tube 43 is arranged. There is. As the self-bonding insulating tape 52, for example, one using polyethylene as a base material and having a rubber-based adhesive is commercially available, and "fit tape" manufactured by 3M Japan Ltd. can be adopted.

In the present embodiment, the self-bonding insulating tape 52 is wound around the outer circumference of the lead wire 51, and the shrinkable insulating tube 43 is arranged so as to cover the outer circumference of the lead wire 51 in the expanded state, and the spiral core is provided. It is pulled out to shrink the shrink insulation tube 43. As a result, the shrinkable insulating tube 43 having the three pleated insulating portions 42 extending to the outer peripheral surface is strongly adhered and fixed to the outer peripheral surface of the lead wire 51. As a result, in addition to obtaining the same effect as that of the fourth embodiment, the self-bonding insulating tape 52 is provided to further bond the shrinkage insulating tube 43 and the lead wire 51. It can be done firmly, and the insulating property at those joints can be further improved.

(6) Sixth Embodiment FIG. 7 shows the sixth embodiment, and schematically shows the state of the mold transformer main body 61 as the main body of the induction device according to the present embodiment at the time of resin molding. There is. In the mold transformer main body 61, a lead wire 63 is led out from a winding main portion 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 the mold resin is formed. The layer 64 is formed. At this time, an insulating coating 63a is provided integrally with the mold resin layer 64 on the outer periphery of the lead wire of the lead wire 63. At the same time, a plurality of, for example, three pleated insulating portions 65 are integrally provided with the mold resin layer 64 on the outer peripheral portion of the tip end portion of the lead wire 63.

In the present embodiment, in the resin molding process, the winding main portion 62 and the lead wire 63 are arranged in the cavity 67 of the mold 66. The cavity 67 corresponds to the entire outer shape of the molded transformer main body 61, and also corresponds to the outer shape of the insulating coating 63a and the pleated insulating portion 65 on the outer periphery of the lead wire 63. In the resin molding process, as shown in the figure, a thermosetting resin is cast into the cavity 67 of the mold 66 from the injection port 67a and cured to insulate the outer periphery of the lead wire 63 together with the mold resin layer 64. The coating 63a and the fold-shaped insulating portion 65 are integrally formed.

According to the sixth embodiment as described above, similarly to the first embodiment and the like, the connection portion between the inner terminal 9b and the lead wire 63 and the tank 2 are connected to each other while suppressing the increase in size of the tank 2. It is possible to obtain effects such as increasing the insulation reliability between the two. Then, at the time of resin molding, the insulating coating 63a of the lead wire 63 and the pleated insulating portion 65 are integrally molded with the mold resin layer 64, so that a separate step for forming the pleated insulating portion is not required, and the process It can be simplified. Further, since the fold-shaped insulating portion 65 is integrated with the insulating coating 63a of the lead wire 63, the insulating performance can be further improved.

(7) Seventh Embodiment FIGS. 8 and 9 show a seventh embodiment. In the present embodiment, as shown in FIG. 9, the lead wire 71 is provided with an insulating coating 72 on the outer periphery of the conducting wire 71a, and is provided with a plurality of, for example, three fold-shaped insulating portions 73 located at the tip thereof. Will be done. At this time, the insulating coating 72 is configured by impregnating and curing an insulating resin 75 such as an epoxy resin in a tape-shaped impregnated base material 74 made of an insulating fiber material wound around the outer periphery of the conducting wire 71a. To. The tape-shaped impregnated base material 74 is wound while being wrapped by half a pitch. The fold-shaped insulating portion 73 is formed by impregnating and curing an insulating resin 75 such as an epoxy resin in a thin plate ring-shaped flange-shaped impregnated base material 76 made of an insulating fiber material.

In this case, three flange-shaped impregnated base materials 76 made of an insulating fiber material for forming the pleated insulating portion 73 are formed in advance, and a tape-like tape is formed on the outer periphery of the conducting wire 71a constituting the lead wire 71. After winding the impregnated base material 74, as shown in FIG. 8, each flange-shaped impregnated base material 76 is arranged so as to be fitted on the outer periphery 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 the insulating resin 75 and cured to form the insulating coating 72 and three folds as shown in FIG. A lead wire 71 having a form in which the insulating portion 73 is integrated can be obtained.

According to the seventh embodiment as described above, similarly to the first embodiment and the like, the connection portion between the inner terminal 9b and the lead wire 71 and the tank 2 are connected while suppressing the increase in size of the tank 2. It is possible to obtain effects such as increasing the insulation reliability between the two. 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, the insulating coating having high insulating performance is achieved. The 72 and the pleated insulating portion 73 can be easily formed.

(8) Eighth Embodiment, Other Embodiments FIG. 10 shows an eighth embodiment. In the present embodiment, as in the seventh embodiment, the lead wire 81 is provided with an insulating coating 82 on the outer periphery of the conducting wire 81a, and has a plurality of, for example, three fold-shaped insulating portions 83 located at the tip thereof. Be prepared for it. At this time, the insulating coating 82 is configured by impregnating and curing an insulating resin 85 such as an epoxy resin in a tape-shaped impregnated base material 84 made of an insulating fiber material wound around the outer periphery of the lead wire 81a. In addition, the fold-shaped insulating portion 83 is configured by impregnating and curing an insulating resin 85 such as an epoxy resin in a thin plate ring-shaped flange-shaped impregnated base material 86 made of an insulating fiber material.

The eighth embodiment differs from the seventh embodiment in that the inner peripheral portion 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. It is in a configuration provided in the same form. In this case, the center hole of the flange-shaped impregnated base material 86 is configured to have a small diameter corresponding to the outer diameter of the conducting wire 81a. First, the flange-shaped impregnated base material 86 is fitted and arranged on the outer periphery of the lead wire 81a, for example, and then the tape-shaped impregnated base material 84 is wound, and then the insulating resin 85 is included. Invasion and hardening are performed. According to this, in addition to the effect of the seventh embodiment, the insulating coating 82 portion of the lead wire 81 and the pleated insulating portion 83 can be more firmly integrated, and the insulating performance can be further improved.

In each of the above-described embodiments, the pleated insulating portion is formed in a disk shape, but may be formed in a quadrangular shape or a polygonal shape. The number of pleated insulating portions is not limited to three, and only one may be provided, and two or four or more may be provided. The pleated insulating portion may be provided in an umbrella shape slightly inclined from the vertical, not perpendicular to the extending direction of the lead wire. Further, as the material of each part such as the insulating resin, only one example is shown, and various materials such as a thermoplastic resin used instead of the thermosetting resin can be adopted. For example, the collar-shaped member in the third embodiment may be made of ceramic or the like. The shrinkable insulating tube according to the fourth and fifth embodiments may be made of a heat-shrinkable material and may be made to shrink by heating.

In addition, various changes can be made to the specific configuration of the entire transformer, and the static induction device can be applied not only to the transformer but also to, for example, a reactor. Some of the embodiments described above are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

In the drawing, 1 is a transformer (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 part), 9b is an inner terminal, 10, 22, 23, 24, 32, 42, 65, 73, 83 are fold-shaped insulating parts, 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-bonding insulating tape, and 61 is a molded transformer body (induction device). Main body), 64 is a mold resin layer, 66 is a mold, 74 and 84 are tape-shaped impregnated base materials, 75 and 85 are insulating resins, and 76 and 86 are flange-shaped impregnated base materials.

Claims (11)

A container with a connection terminal for connection to the outside,
The main body of the induction device housed in the container and
A lead wire that is led out from the main body of the induction device with an insulating coating and whose tip is electrically connected to the inner terminal of the connection terminal portion.
A static induction device including a pleated insulating portion made of an insulating material integrally provided so as to extend to the outer periphery of the lead wire. The stationary induction device according to claim 1, wherein the pleated insulating portion is provided at the tip end portion of the lead wire. A plurality of the fold-shaped insulating portions are provided in the direction in which the lead wire extends, and the plurality of pleated insulating portions are configured to have the same size or to be located on the tip end side of the lead wire. The stationary induction device according to claim 1 or 2. A method for manufacturing the pleated insulating portion in the static induction device according to any one of claims 1 to 3.
Fold-shaped insulation in a static induction device in which the lead wire is inserted and arranged in a mold, an insulating resin is injected into the cavity in the mold, and the fold-shaped insulating portion is integrally molded on the outer peripheral portion of the lead wire. Manufacturing method of the part. A method for manufacturing the pleated insulating portion in the static induction device according to any one of claims 1 to 3.
A collar-shaped member made of an insulating material for forming the fold-shaped insulating portion is formed in advance, and the flange-shaped member is arranged on the outer periphery of the lead wire, and the outer peripheral surface of the lead wire and the flange-shaped member A method for manufacturing a pleated insulating portion in a static induction device for forming the pleated insulating portion by joining the inner peripheral portion with a resin material. A method for manufacturing the pleated insulating portion in the static induction device according to any one of claims 1 to 3.
A shrinkable insulating tube provided with the pleated insulating portion is formed in advance on the outer peripheral portion, the shrinking insulating tube is arranged so as to cover the outer periphery of the lead wire, and the shrinkable insulating tube is shrunk to form the lead wire. A method for manufacturing a pleated insulating part in a static induction device that is brought into close contact with the outer circumference. The method for manufacturing a pleated insulating portion in a static induction device according to claim 6, wherein the insulating shrink tube is made of a room temperature shrinkable material, and the shrinking step is performed at room temperature. Manufacture of a fold-shaped insulating portion in the static induction device according to claim 6 or 7, wherein an insulating tape having self-bonding property is wound around a portion where the shrinkable insulating tube is arranged on the outer periphery of the lead wire. Method. A method for manufacturing the pleated insulating portion in the static induction device according to any one of claims 1 to 3.
The main body of the induction device is composed of a molded transformer that is entirely resin-molded using a mold, and at the time of the resin molding, the insulating coating of the lead wire and the fold-shaped insulating portion are integrally molded. A method for manufacturing a pleated insulation part in an induction device. A method for manufacturing the pleated insulating portion in the static induction device according to any one of claims 1 to 3.
A collar-shaped impregnated base material made of an insulating fiber material for forming the fold-shaped insulating portion is formed in advance, and a tape-shaped impregnated base material made of an insulating fiber material is wound around the outer periphery of the lead wire. A method for manufacturing a fold-shaped insulating portion in a static induction device in which the flange-shaped impregnated base material is placed while being rotated, and the tape-shaped impregnated base material and the flange-shaped impregnated base material are impregnated with an insulating resin and cured. The manufacture of a fold-shaped insulating portion in the static induction device according to claim 10, wherein the inner peripheral portion of the flange-shaped impregnated base material is provided in a form of being embedded in the layer of the tape-shaped impregnated base material on the outer periphery of the lead wire. Method.

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