JP2015046542A - Stationary induction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a cooling efficiency of a coil while suppressing increase in an external diameter of the coil.SOLUTION: A stationary induction apparatus comprises: a core 110; a low-voltage winding 121 including a plurality of cylindrical coils coaxially wound to the core 110; a high-voltage winding 122 coaxially arranged with the low-voltage winding at the outer side of the low-voltage winding, and including a plurality of other cylindrical coils would to the core; a sheet member 140 that is placed between at least one cylindrical coil of the low-voltage winding 121 and the high-voltage winding 122, folded to have fin-like protrusions 141, wound around outer and inner peripheries of the cylindrical coil, and has heat resistance and insulation properties; and spacers 135, 136 that keep intervals between each of the cylindrical coils and have insulation property. Each of the cylindrical coils is covered by an insulation layer formed by a cured resin prepreg having insulation. The sheet member is covered by a heat conductive layer formed by a cured coating including a resin with high heat conductivity.

Description

  The present invention relates to a stationary induction device, and more particularly, to a dry stationary induction device.

  As prior documents disclosing the configuration of the mold coil, there are JP-A-54-105726 (Patent Document 1) and JP-A-2012-151374 (Patent Document 2).

  Patent Document 1 describes a molded coil in which fins are integrally cast with a mold resin on the coil surface. Patent Document 2 describes a resin mold coil having a resin layer including a prepreg layer and a glass substrate layer.

JP 54-105726 A JP 2012-151374 A

  In the case of providing a heat radiation fin made of mold resin in a cast mold coil, the heat radiation fin is provided only on the outer periphery of the coil. In this case, an increase in the heat radiation amount due to the heat radiation fin is small, and the outer diameter of the coil becomes large, which is not preferable.

  Patent Document 2 describes that an air layer serving as both insulation and cooling is provided between a primary coil and a secondary coil. Increasing the air layer to improve the cooling performance is not preferable because the outer diameter of the coil increases.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a stationary induction device capable of improving the cooling efficiency of the winding while suppressing an increase in the outer diameter of the winding.

  A static induction device according to the present invention is disposed coaxially with a low voltage winding including an iron core, a plurality of cylindrical windings coaxially wound around the iron core, and a low voltage winding outside the low voltage winding, and wound around the iron core. Arranged between the high-voltage winding including a plurality of other rotated cylindrical windings and at least one cylindrical winding of the low-voltage winding and the high-voltage winding, and folded so as to have a fin-like protrusion The sheet-like member that is wound around at least one of the outer circumference and the inner circumference of the cylindrical winding and has heat resistance and electrical insulation, and the spacing between the cylindrical windings of the low-voltage winding and the high-voltage winding are maintained. And a plurality of insulating spacers. Each cylindrical winding of the low-voltage winding and the high-voltage winding is covered with an insulating layer formed by curing a resin prepreg having electrical insulation properties. The sheet-like member is covered with a heat conductive layer formed by curing a paint containing a resin having higher thermal conductivity than the material of the sheet-like member.

  ADVANTAGE OF THE INVENTION According to this invention, the cooling efficiency of a coil | winding can be improved, suppressing that the outer diameter of a coil | winding becomes large.

It is a perspective view which shows the structure of the stationary induction | guidance | derivation apparatus which concerns on one Embodiment of this invention. It is sectional drawing which looked at the stationary induction | guidance | derivation apparatus of FIG. 1 from the II-II line arrow direction. It is a perspective view which shows the external appearance of the cylindrical coil | winding by which the sheet-like member was wound in the static induction apparatus which concerns on the same embodiment. It is a partial cross section figure which shows arrangement | positioning of the sheet-like member of the transformer which concerns on the modification of this embodiment.

  Hereinafter, a stationary induction device according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated. In the following embodiments, an inner iron type transformer will be described as an example of a static induction device. However, the static induction device is not limited to an inner iron type transformer, and includes, for example, a reactor.

  FIG. 1 is a perspective view showing a configuration of a stationary induction device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the static induction device of FIG. 1 as viewed from the direction of arrows II-II. FIG. 3 is a perspective view showing the external appearance of a cylindrical winding wound with a sheet-like member in the stationary induction device according to the present embodiment. In FIG. 1, in order to explain the configuration of the windings, one of the three windings is cut in stages.

  As shown in FIG. 1, in a transformer 100 that is a stationary induction device according to an embodiment of the present invention, a plurality of silicon steel plates are laminated to constitute an iron core 110. Since the transformer 100 according to the present embodiment is a three-phase transformer, the iron core 110 has three legs. A substantially cylindrical winding portion 120 having the leg portion as the central axis is disposed on each leg portion of the iron core 110.

  As shown in FIGS. 1 and 2, the transformer 100 according to this embodiment is a so-called inner iron type transformer. The winding part 120 of the transformer 100 is arranged coaxially with the low voltage winding 121 including a plurality of cylindrical windings wound around the iron core 110 and coaxially with the low voltage winding 121 outside the low voltage winding 121. And a high voltage winding 122 including a plurality of other cylindrical windings wound around 110.

  In FIG. 2, the low-voltage winding 121 includes two cylindrical windings, and the high-voltage winding 122 includes four cylindrical windings. However, the number of turns of the high-voltage winding 122 is lower. It is sufficient that the number of windings of the pressure winding 121 is larger, and the number of cylindrical windings included in each of the low-voltage winding 121 and the high-voltage winding 122 is not limited to the above.

  Each cylindrical winding of the low-voltage winding 121 and the high-voltage winding 122 includes a linear conductor covered with insulating paper. The cylindrical windings of the low-voltage winding 121 and the high-voltage winding 122 are covered with an insulating layer formed by curing a resin prepreg having electrical insulating properties. That is, the insulating layer covers the outside of the insulating paper. In the present embodiment, the insulating layer is made of an epoxy resin.

  Between the leg part of the iron core 110 and the low voltage | pressure coil | winding 121, the 1st insulating cylinder 123 which consists of an epoxy resin is arrange | positioned. Between the cylindrical winding inside the cylindrical winding included in the low-voltage winding 121 and the first insulating cylinder 123, a plurality of square pillar-shaped first spacers 131 having electrical insulation are provided around the cylindrical winding. It is arranged at equal intervals in the direction.

  The first spacer 131 is sandwiched between the cylindrical winding inside the low voltage winding 121 and the first insulating cylinder 123, and the distance between the low voltage winding 121 and the first insulating cylinder 123 by the first spacer 131. Is maintained. In the present embodiment, 12 first spacers 131 are arranged at intervals of 30 °. The first spacer 131 is made of an epoxy resin. However, the number, shape, and material of the first spacers 131 are not limited to the above.

  Between the low voltage winding 121 and the high voltage winding 122, a second insulating cylinder 124 made of epoxy resin is disposed. Between the outer cylindrical winding of the cylindrical windings included in the low-voltage winding 121 and the second insulating cylinder 124, a plurality of square pillar-shaped second spacers 132 having electrical insulation are provided around the cylindrical winding. It is arranged at equal intervals in the direction. Between the innermost cylindrical winding of the cylindrical windings included in the high-voltage winding 122 and the second insulating cylinder 124, a plurality of square pillar-shaped third spacers 133 having electrical insulation are provided for the cylindrical winding. It arrange | positions at equal intervals in the circumferential direction.

  The second spacer 132 is sandwiched between the cylindrical winding outside the low-voltage winding 121 and the second insulating cylinder 124, and the distance between the low-voltage winding 121 and the second insulating cylinder 124 by the second spacer 132. Is maintained. In the present embodiment, four second spacers 132 are arranged at 90 ° intervals. The second spacer 132 is made of an epoxy resin. However, the number, shape, and material of the second spacers 132 are not limited to the above.

  The third spacer 133 is sandwiched between the innermost cylindrical winding of the high-voltage winding 122 and the second insulating cylinder 124, and is interposed between the high-voltage winding 122 and the second insulating cylinder 124 by the third spacer 133. The interval is maintained. In the present embodiment, 12 third spacers 133 are arranged at intervals of 30 °. The third spacer 133 is made of an epoxy resin. However, the number, shape, and material of the third spacer 133 are not limited to the above.

  A third insulating cylinder 125 made of epoxy resin is disposed outside the outermost cylindrical winding of the cylindrical windings included in the high-voltage winding 122. Between the outermost cylindrical winding of the cylindrical windings included in the high-voltage winding 122 and the third insulating cylinder 125, a plurality of square pillar-shaped fourth spacers 134 having electrical insulation are provided around the cylindrical winding. It is arranged at equal intervals in the direction.

  The fourth spacer 134 is sandwiched between the outermost cylindrical winding of the high-voltage winding 122 and the third insulating cylinder 125, and is interposed between the high-voltage winding 122 and the third insulating cylinder 125 by the fourth spacer 134. The interval is maintained. In the present embodiment, four fourth spacers 134 are arranged at 90 ° intervals. The fourth spacer 134 is made of an epoxy resin. However, the number, shape, and material of the fourth spacers 134 are not limited to the above.

  Between the cylindrical windings of the low-voltage winding 121, a plurality of quadrangular columnar fifth spacers 135 having electrical insulation are arranged. The fifth spacer 135 is sandwiched between the cylindrical windings of the low-voltage winding 121, and the interval between the cylindrical windings of the low-voltage winding 121 is maintained by the fifth spacer 135. In the present embodiment, four fifth spacers 135 are arranged at 90 ° intervals. The fifth spacer 135 is made of an epoxy resin. However, the number, shape, and material of the fifth spacers 135 are not limited to the above.

  Between the cylindrical windings of the high-voltage winding 122, a plurality of quadrangular columnar sixth spacers 136 having electrical insulation are arranged. The sixth spacer 136 is sandwiched between the cylindrical windings of the high-voltage winding 122, and the interval between the cylindrical windings of the high-voltage winding 122 is maintained by the sixth spacer 136. In the present embodiment, four sixth spacers 136 are arranged at 90 ° intervals. The sixth spacer 136 is made of an epoxy resin. However, the number, shape, and material of the sixth spacers 136 are not limited to the above.

  As described above, the gap portion maintained by the spacer serves as a path for an insulating gas such as air for cooling the winding. By increasing the contact area with the insulating gas, the cooling efficiency by the insulating gas can be improved. In addition, in the transformer 100, the insulating gas is allowed to flow by natural convection, but the transformer 100 may include a fan for allowing the insulating gas to flow.

  As shown in FIGS. 2 and 3, in the present embodiment, a sheet-like member 140 having heat resistance and electrical insulation is wound around the outer circumference of each of the cylindrical windings of the low voltage winding 121 and the high voltage winding 122. . The sheet-like member 140 is folded so as to have a plurality of fin-like protrusions 141. The sheet-like member 140 is wound around the outer periphery of each cylindrical winding so that the protrusion 141 protrudes outside the cylindrical winding. The plurality of protrusions 141 are arranged on the outer periphery of the cylindrical winding so as to extend parallel to the axis of the cylindrical winding and to be positioned at substantially equal intervals except for the end portions in the circumferential direction of the cylindrical winding. . In the present embodiment, the entire outer periphery of one cylindrical winding is covered with four sheet-like members 140. However, the entire outer periphery of one cylindrical winding may be covered with one sheet-like member 140.

  In the present embodiment, the sheet-like member 140 is made of polyamide paper. Polyamide paper has heat resistance up to about 180 ° C. As the polyamide paper, Nomex (registered trademark) manufactured by DuPont or the like can be used. However, the material of the sheet-like member 140 is not limited to polyamide paper, and any material having heat resistance and electrical insulation may be used.

  In addition, the sheet-like member 140 may be disposed between at least one of the low-voltage winding 121 and the high-voltage winding 122. However, since the low voltage winding 121 is close to the iron core 110 that generates heat compared to the high voltage winding 122, the temperature rise is large, and the heat radiation area is small because the diameter is small. Therefore, the low voltage winding 121 is heated to, for example, about 155 ° C. Therefore, it is preferable that the sheet-like member 140 is disposed between the cylindrical windings of the low-voltage winding 121.

  The sheet-like member 140 is covered with a heat conductive layer formed by curing a paint containing a resin having higher thermal conductivity than the material of the sheet-like member 140. In the present embodiment, the paint applied to the sheet-like member 140 is varnish. As a varnish application method according to the present embodiment, the sheet-like member 140 made of polyamide paper is impregnated with the varnish by immersing the winding portion 120 in a state where the sheet-like member 140 is wound in a varnish bath.

  The shape of the sheet-like member 140 is maintained by curing the applied varnish. By covering the surface of the sheet-like member 140 with a thermally conductive layer made of a cured varnish, the thermal conductivity of the sheet-like member 140 is increased. Therefore, the protrusion 141 of the sheet-like member 140 effectively functions as a heat radiating fin.

  In the present embodiment, in the state of being wound around the cylindrical winding, the end portions of the sheet-like members 140 adjacent to each other in the circumferential direction of the cylindrical winding are pressed by the spacers, so that the sheet-like member 140 is cylindrically wound. Fixed against the line.

  Specifically, the end portions of the sheet-like member 140 disposed between the cylindrical windings of the low-voltage winding 121 are pressed by the fifth spacer 135 and the cylindrical windings inside the low-voltage winding 121 are pressed. It is fixed to the outer periphery.

  The ends of the sheet-like member 140 disposed between the cylindrical winding of the low-voltage winding 121 and the second insulating cylinder 124 are pressed by the second spacer 132 so that the cylindrical winding outside the low-voltage winding 121 is pressed. It is fixed to the outer periphery of.

  The ends of the sheet-like member 140 disposed between the cylindrical windings of the high-voltage winding 122 are pressed by a sixth spacer 136 and fixed to the outer periphery of the cylindrical winding of the high-voltage winding 122.

  The ends of the sheet-like member 140 disposed between the cylindrical winding of the high-voltage winding 122 and the third insulating cylinder 125 are pressed by the fourth spacer 134 to be the outermost cylindrical winding of the high-voltage winding 122. It is fixed to the outer periphery of the wire.

  By fixing the sheet-like member 140 to the cylindrical winding with the spacer as described above, the sheet-like member 140 can be fixed to the cylindrical winding without interfering with the protrusion 141. Further, since it is not necessary to separately provide a member for fixing the sheet-like member 140, the number of parts can be reduced.

  In the transformer 100 according to the present embodiment, by arranging the sheet-like member 140 between the cylindrical windings of the low-voltage winding 121 and the high-voltage winding 122, the outer diameter of the winding portion 120 is increased. The cooling efficiency of the low-voltage winding 121 and the high-voltage winding 122 can be improved by increasing the contact area with the insulating gas and increasing the heat radiation area while suppressing.

  Furthermore, by improving the cooling efficiency of the low voltage winding 121 and the high voltage winding 122, the cross-sectional area of the linear conductors included in each of the low voltage winding 121 and the high voltage winding 122 can be reduced. As a result, the winding part 120 can be reduced in size.

  Since the polyamide paper can be easily folded, the manufacturing time of the winding portion 120 is almost the same as that when the sheet-like member 140 is not provided. For this reason, in the transformer 100, there is almost no decrease in productivity due to the provision of the sheet-like member 140.

Hereinafter, a transformer according to a modification of the present embodiment will be described.
FIG. 4 is a partial cross-sectional view showing the arrangement of sheet-like members of a transformer according to a modification of the present embodiment. As shown in FIG. 4, in the transformer according to the modification of the present embodiment, in the cylindrical windings adjacent to each other, the sheet 141 is projected so that the protrusion 141 protrudes to the outer periphery of the cylindrical winding located inside. The sheet-like member 150 is wound around the inner periphery of the cylindrical winding positioned on the outer side so that the protrusion 151 protrudes inward. The sheet-like member 150 is formed in the same manner as the sheet-like member 140.

  The plurality of protrusions 151 are arranged so as to extend in parallel to the axis of the cylindrical winding on the inner periphery of the cylindrical winding and to be positioned at substantially equal intervals except for the end portions in the circumferential direction of the cylindrical winding. Yes. In the state of being wound around the cylindrical winding, the end portions of the sheet-like members 150 adjacent to each other in the circumferential direction of the cylindrical winding are pressed by the spacer, so that the sheet-like member 150 is fixed to the cylindrical winding. ing.

  As described above, by disposing the sheet-like member 140 and the sheet-like member 150, it is possible to further increase the contact area with the insulating gas while suppressing an increase in the outer diameter of the winding part 120, thereby increasing the heat dissipation area. The cooling efficiency of the low voltage winding 121 and the high voltage winding 122 can be improved.

  Further, the sheet-like member 140 and the sheet-like member 150 can reduce the cross-sectional area of the insulating gas passage while ensuring the insulation distance between the cylindrical windings. The cooling efficiency of the low voltage winding 121 and the high voltage winding 122 can be further improved by increasing the flow rate of the insulating gas flowing between the lines.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Further, all modifications within the meaning and scope equivalent to the scope of the claims are included.

  100 transformer, 110 iron core, 120 winding section, 121 low voltage winding, 122 high voltage winding, 123 first insulating cylinder, 124 second insulating cylinder, 125 third insulating cylinder, 131 first spacer, 132 second spacer, 133 3rd spacer, 134 4th spacer, 135 5th spacer, 136 6th spacer, 140,150 Sheet-like member, 141,151 Protrusion.

Claims (5)

Iron core,
A low-voltage winding including a plurality of cylindrical windings wound coaxially around the iron core;
A high-voltage winding including a plurality of other cylindrical windings coaxially arranged with the low-voltage winding outside the low-voltage winding and wound around the iron core;
It is arranged between the cylindrical windings of at least one of the low-voltage winding and the high-voltage winding, and is folded so as to have a fin-like projection and is at least one of the outer periphery and inner periphery of the cylindrical winding A sheet-like member that is wound and has heat resistance and electrical insulation;
Maintaining a distance between the cylindrical windings of the low-voltage winding and the high-voltage winding, and a plurality of spacers having electrical insulation,
Each of the cylindrical windings of the low-voltage winding and the high-voltage winding is covered with an insulating layer formed by curing a resin prepreg having electrical insulation,
The said sheet-like member is a stationary induction | guidance | derivation apparatus covered with the heat conductive layer formed when the coating material containing resin whose heat conductivity is higher than the material of the said sheet-like member hardens | cures.   In the state of being wound around the cylindrical winding, the end portions of the sheet-like members adjacent to each other in the circumferential direction of the cylindrical winding are pressed by the spacer, so that the sheet-like member is attached to the cylindrical winding. The stationary induction device according to claim 1, which is fixed with respect to the stationary induction device.   In the cylindrical windings adjacent to each other, the sheet-like member is wound around the outer periphery of the cylindrical winding positioned inside so that the projection protrudes outward, and the cylindrical winding positioned outside The stationary induction device according to claim 1 or 2, wherein the sheet-like member is wound on an inner periphery so that the protrusion protrudes inward.   The stationary induction device according to any one of claims 1 to 3, wherein the sheet-like member is made of polyamide paper.   The stationary induction device according to any one of claims 1 to 4, wherein the paint is a varnish.

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