JP2013222894A - Multiple cylindrical coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture multiple cylindrical coils while miniaturizing the multiple cylindrical coils.SOLUTION: Multiple cylindrical coils include: first cylindrical coil units 130 around which first cylindrical coils 131 are wound like concentric cylinders to be located in a plurality of layers; and second cylindrical coil units 140 which are located so as to be aligned with the first cylindrical coil units 130 in axis directions of the first cylindrical coils 131, and around which second cylindrical coils 141 to be electrically and serially connected with the first cylindrical coils 131 are wound like concentric cylinders with the first cylindrical coils 131 to be located in a plurality of layers. In addition, the multiple cylindrical coils include: annular insulation paper 120 in planar view located between the first cylindrical coil units 130 and the second cylindrical coil units 140; and a connection part 154 which mutually connects the first cylindrical coil 131 located innermost and the second cylindrical coil 141 located innermost, or the first cylindrical coil 131 located outermost and the second cylindrical coil 141 located outermost.

Description

  The present invention relates to a multi-cylindrical winding, and more particularly to an oil-insulated multi-cylindrical winding.

  When a surge with a short rise time such as a lightning impulse enters the line end of the multiple cylindrical winding, a high potential difference is generated between the cylindrical winding layers adjacent to the line end. In order to withstand the voltage generated at the time of surge intrusion such as lightning impulse, as a prior document disclosing a multi-cylindrical winding with a large insulation distance between the cylindrical winding layers close to the line end JP-A-63-204606 (Patent Document 1).

  In the multiple cylindrical winding described in Patent Document 1, the vertical oil passage between the layers is enlarged at the axial end of the cylindrical winding layer where a high electric field is generated. For this reason, the cylindrical windings are wound alternately.

  Japanese Unexamined Patent Application Publication No. 2000-164435 (Patent Document 2) is a prior art document that discloses a static electromagnetic induction device in which an insulating member is provided at the end of a cylindrical winding layer close to the line end. In the stationary electromagnetic induction device described in Patent Document 2, both end portions of the low-voltage side winding and both end portions of the high-voltage side winding are covered with insulating members having a substantially U-shaped cross section.

  Further, as a prior document disclosing a multiple cylindrical winding in which a shield conductor is provided between the layers of the cylindrical winding, there is JP-A-63-211710 (Patent Document 3). In the multiple cylindrical winding described in Patent Document 3, a shield conductor is wound in parallel between the layers of the cylindrical winding, and one end of the shield conductor is connected between the layers.

JP-A-63-204606 JP 2000-164435 A Japanese Unexamined Patent Publication No. 63-217710

  As described above, in order to secure the insulation distance between the layers of the multiple cylindrical windings, when the cylindrical winding is wound at an inclination or when an insulating member or a shield conductor is provided between the cylindrical winding layers, the multiple cylindrical windings The manufacturing method becomes complicated.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a multiple cylindrical winding that can be easily manufactured while reducing the size.

  The multiple cylindrical winding based on this invention is a multiple cylindrical winding used by being immersed in insulating oil. The multiple cylindrical winding includes a first cylindrical winding unit in which the first cylindrical winding is wound in a coaxial cylindrical shape and is positioned in a plurality of layers, and a first cylindrical winding unit in the axial direction of the first cylindrical winding. A second cylindrical winding that is positioned so as to be arranged in a plurality of layers by winding a second cylindrical winding electrically connected in series with the first cylindrical winding in a coaxial cylindrical shape with the first cylindrical winding. A line unit. The multi-cylindrical winding includes an annular insulating paper located between the first cylindrical winding unit and the second cylindrical winding unit, a first cylindrical winding located on the innermost side, and an innermost side. A second cylindrical winding positioned, or a connecting portion that connects the first cylindrical winding positioned on the outermost side and the second cylindrical winding positioned on the outermost side to each other.

  According to the present invention, a multi-cylindrical winding can be easily manufactured while downsizing.

It is a perspective view which shows the structure of the multiple cylindrical winding which concerns on Embodiment 1 of this invention. It is sectional drawing which looked at the multiple cylindrical winding of FIG. 1 from the II-II line arrow direction. It is sectional drawing which looked at the multiple cylindrical winding concerning Embodiment 2 of this invention from the same direction as FIG. It is sectional drawing which looked at the multiple cylindrical winding which concerns on Embodiment 3 of this invention from the same direction as FIG. It is a schematic diagram which shows the structure of the multiple cylindrical winding which concerns on a comparative example. It is a schematic diagram which shows the structure of the multiple cylindrical winding which concerns on an Example. It is a graph which shows the electric potential oscillation generate | occur | produced when the lightning impulse is applied to the multiple cylindrical winding of a comparative example. It is a graph which shows the electric potential oscillation generate | occur | produced when the lightning impulse is applied to the multiple cylindrical winding of an Example.

  Hereinafter, the multiple cylindrical winding according to Embodiment 1 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.

(Embodiment 1)
FIG. 1 is a perspective view showing the configuration of a multiple cylindrical winding according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the multiple cylindrical winding of FIG. 1 as viewed from the direction of arrows II-II.

  As shown in FIGS. 1 and 2, the multiple cylindrical winding 100 according to the first embodiment of the present invention includes an insulating cylinder 110, a first cylindrical winding unit 130 positioned outside the insulating cylinder 110, and an insulating cylinder 110. A second cylindrical winding unit 140 located outside and below the first cylindrical winding unit 130; and an insulating paper 120 positioned between the first cylindrical winding unit 130 and the second cylindrical winding unit 140. It is out.

  Each of the first cylindrical winding unit 130, the second cylindrical winding unit 140, and the insulating paper 120 has an opening through which the insulating cylinder 110 can be inserted at the center. The insulating paper 120 is placed on the second cylindrical winding unit 140 and the first cylindrical winding unit 130 is placed on the insulating paper 120 in a state where the insulating cylinder 110 is inserted through each central portion.

  The input-side line end 190 is drawn from the upper end of the first cylindrical winding 131 located on the outermost side in the first cylindrical winding unit 130. An output-side line end 191 is drawn from the lower end of the second cylindrical winding 141 located on the outermost side in the second cylindrical winding unit 140.

  The multiple cylindrical winding 100 is used by being immersed in insulating oil. The interlayer between the first cylindrical winding 131 and the second cylindrical winding 141 is filled with insulating oil. In the present embodiment, the length in the axial direction of the first cylindrical winding 131 is the same as the length in the axial direction of the second cylindrical winding 141 positioned so as to be aligned with the first cylindrical winding 131. However, the axial lengths of the first cylindrical winding 131 and the second cylindrical winding 141 may be different from each other.

  In the first cylindrical winding unit 130, the first cylindrical winding 131 is wound in a coaxial cylindrical shape and positioned in a plurality of layers. The first cylindrical winding 131 has a structure in which the insulating paper 133 covers the periphery of the copper wire 132.

  In the present embodiment, the first cylindrical winding 131 is wound in five layers, but the number of layers is not limited to five, and may be a plurality of layers. Spacers (not shown) are provided between the layers of the first cylindrical winding 131. The spacer is formed of insulating paper such as a press board.

  The first cylindrical windings 131 are connected in series by being connected via interlayer connection portions that are alternately positioned on one end side or the other end side in the axial direction of the first cylindrical winding 131 between the respective layers. Note that the interlayer connection portion is a part of the first cylindrical winding 131.

  Specifically, the lower end side of the first cylindrical winding 131 located on the outermost side and the lower end side of the first cylindrical winding 131 located on the inner side thereof are connected by an interlayer connection part 134a. Inside, the upper end sides of the adjacent first cylindrical windings 131 are connected to each other by an interlayer connection part 134b. Inside, the lower end sides of the adjacent first cylindrical windings 131 are connected to each other by an interlayer connection part 134c. Inside, the upper ends of the adjacent first cylindrical windings 131 are connected to each other by an interlayer connection part 134d.

  At the lower end of the first cylindrical winding 131 of each layer, a plurality of insulating papers 138 having the same thickness are arranged at intervals in the circumferential direction of the first cylindrical winding 131. At the upper end of the first cylindrical winding 131 of each layer, a plurality of insulating papers 139 having the same thickness are arranged at intervals in the circumferential direction of the first cylindrical winding 131. In the first cylindrical winding unit 130, the first cylindrical winding 131 is sandwiched between the insulating paper 138 and the insulating paper 139 so that the upper surface and the lower surface have flat surfaces.

  The second cylindrical winding unit 140 is positioned so as to be aligned with the first cylindrical winding unit 130 in the axial direction of the first cylindrical winding 131. In the second cylindrical winding unit 140, a second cylindrical winding 141 electrically connected in series with the first cylindrical winding 131 is wound in a coaxial cylindrical shape with the first cylindrical winding 131 to form a plurality of layers. Is located. The second cylindrical winding 141 has a structure in which the insulating paper 143 covers the periphery of the copper wire 142.

  In the present embodiment, the second cylindrical winding 141 is wound in five layers, but the number of layers is not limited to five, and may be a plurality of layers. Spacers (not shown) are provided between the layers of the second cylindrical winding 141. The spacer is formed of insulating paper such as a press board.

  The second cylindrical windings 141 are connected in series by being connected via interlayer connection portions that are alternately located on one end side or the other end side in the axial direction of the second cylindrical winding 141 between the respective layers. The interlayer connection part is a part of the second cylindrical winding 141.

  Specifically, the lower end side of the second cylindrical winding 141 located on the innermost side and the lower end side of the second cylindrical winding 141 located on the outer side thereof are connected by an interlayer connection portion 144a. On the outside thereof, the upper ends of the adjacent second cylindrical windings 141 are connected to each other by an interlayer connection 144b. On the outside thereof, the lower ends of the adjacent second cylindrical windings 141 are connected to each other by an interlayer connection 144c. On the outside, the upper ends of the adjacent second cylindrical windings 141 are connected to each other by an interlayer connection 144d.

  At the upper end of the second cylindrical winding 141 of each layer, a plurality of insulating papers 148 having the same thickness are arranged at intervals in the circumferential direction of the second cylindrical winding 141. At the lower end of the second cylindrical winding 141 of each layer, a plurality of insulating papers 149 having the same thickness are arranged at intervals in the circumferential direction of the second cylindrical winding 141. In the second cylindrical winding unit 140, the second cylindrical winding 141 is sandwiched between the insulating paper 148 and the insulating paper 149, so that the upper surface and the lower surface have flat surfaces.

  The insulating paper 120 is located between the first cylindrical winding unit 130 and the second cylindrical winding unit 140 and has an annular outer shape in plan view. In the present embodiment, the insulating paper 120 is constituted by a press board.

  The lower surface of the insulating paper 120 is in contact with the insulating paper 148 of the second cylindrical winding unit 140. The upper surface of the insulating paper 120 is in contact with the insulating paper 138 of the first cylindrical winding unit 130.

  The multiple cylindrical winding 100 has a connecting portion 154 that connects the first cylindrical winding 131 and the second cylindrical winding 141 to each other. In the present embodiment, the connecting portion 154 includes an end portion of the first cylindrical winding 131 on the second cylindrical winding unit 140 side, and an end portion of the second cylindrical winding 141 on the first cylindrical winding unit 130 side. Is connected. The connecting portion 154 has a structure in which the insulating paper covers the copper wire.

  In the present embodiment, the input-side line end 190 and the output-side line end 191 are drawn from the outermost first cylindrical winding 131 and the second cylindrical winding 141, respectively. The potential difference between 131 and the outermost second cylindrical winding 141 is large. Therefore, the innermost first cylindrical winding 131 and the innermost second cylindrical winding 141 that are close to each other are connected to each other by the connecting portion 154.

  When the input side line end 190 and the output side line end 191 are drawn from the innermost first cylindrical winding 131 and the second cylindrical winding 141, respectively, the outermost first cylindrical winding is located. 131 and the second cylindrical winding 141 located on the outermost side are connected to each other by a connecting portion 154.

  Hereinafter, the potential difference generated between the layers of the first cylindrical winding 131 and the second cylindrical winding 141 will be described.

  When a lightning impulse is applied from the input-side line end 190, the high-voltage current flows in order from the outer first cylindrical winding 131 toward the inner first cylindrical winding 131 in the order of arrows 130a, 130b, 130c, and arrows. It flows in the direction shown by 130d and arrow 130e.

  The high-voltage current passes through the connection portion 154 and enters the second cylindrical winding 141. The high-voltage current flows in the direction indicated by the arrow 140a, the arrow 140b, the arrow 140c, the arrow 140d, and the arrow 140e sequentially from the inner second cylindrical winding 141 toward the outer second cylindrical winding 141.

  Thus, when a lightning impulse is applied to the input side line end 190, the potential difference between the first cylindrical winding 131 located closest to the input side line end 190 and the first cylindrical winding 131 inside thereof. V is the highest.

  Since the multi-cylindrical winding 100 of the present embodiment is composed of the first cylindrical winding unit 130 and the second cylindrical winding unit 140, the first cylindrical winding 131 and the conventional multi-cylindrical winding are similar to the conventional multi-cylindrical winding. The potential difference V generated between the layers can be reduced as compared with the case where the second cylindrical winding 141 is integrated with one cylindrical winding unit.

  Therefore, the interlayer distance L between the cylindrical windings can be shortened while maintaining a withstand voltage that can withstand a high voltage potential difference V due to factors such as lightning impulse. As a result, the multiple cylindrical winding 100 can be reduced in size.

  However, in order to ensure an insulation distance between the first cylindrical winding 131 and the second cylindrical winding 141, the total thickness of the insulating paper 120, 138, and 148 is required to be equal to or greater than a predetermined thickness. In particular, since the insulation distance between the first cylindrical winding 131 and the second cylindrical winding 141 located on the outermost side having a large potential difference must be ensured, the shaft of the multiple cylindrical winding 100 according to the present embodiment. The length in the direction can be longer than conventional multiple cylindrical windings.

  However, as the number of layers of the first cylindrical winding 131 and the second cylindrical winding 141 increases, the interlayer distance L between the first cylindrical winding 131 and the second cylindrical winding 141 is shortened, whereby the multiple cylindrical winding 100. Can be miniaturized.

  In addition, the multiple cylindrical winding 100 according to the present embodiment is a state in which the first cylindrical winding unit 130 and the second cylindrical winding unit 140 manufactured separately are stacked with the insulating paper 120 interposed therebetween, Since they can be formed by connecting to each other through the connecting portion 154, the multiple cylindrical winding 100 can be easily manufactured.

  Further, the interlayer distance L between the first cylindrical winding 131 and the second cylindrical winding 141 is constant in the axial direction, and it is not necessary to incline and wind the first cylindrical winding 131 and the second cylindrical winding 141. In addition, the first cylindrical winding unit 130 and the second cylindrical winding unit 140 can be manufactured.

  In this embodiment, two cylindrical winding units are stacked, but three or more cylindrical winding units may be stacked.

  Hereinafter, the multiple cylindrical winding according to the second embodiment of the present invention will be described. The multiple cylindrical winding 200 according to the present embodiment differs from the multiple cylindrical winding 100 according to the first embodiment only in that the shortest distance between the first cylindrical winding and the second cylindrical winding is different for each layer. The description of other configurations will not be repeated.

(Embodiment 2)
FIG. 3 is a cross-sectional view of the multiple cylindrical winding according to Embodiment 2 of the present invention viewed from the same direction as FIG. As shown in FIG. 3, the multiple cylindrical winding 200 according to the second embodiment of the present invention includes an insulating cylinder 210, a first cylindrical winding unit 230 positioned outside the insulating cylinder 210, an outside of the insulating cylinder 210, and A second cylindrical winding unit 240 positioned below the first cylindrical winding unit 230; and an insulating paper 220 positioned between the first cylindrical winding unit 230 and the second cylindrical winding unit 240. .

  Each of the first cylindrical winding unit 230, the second cylindrical winding unit 240, and the insulating paper 220 has an opening through which the insulating cylinder 210 can be inserted at the center. The insulating paper 220 is placed on the second cylindrical winding unit 240 and the first cylindrical winding unit 230 is placed on the insulating paper 220 in a state where the insulating cylinder 210 is inserted through each central portion.

  The input-side line end 290 is drawn from the upper end of the first cylindrical winding 231 located on the outermost side in the first cylindrical winding unit 230. An output-side line end 291 is drawn from the lower end of the second cylindrical winding 241 located on the outermost side in the second cylindrical winding unit 240.

  The multiple cylindrical winding 200 is used by being immersed in insulating oil. The interlayer between the first cylindrical winding 231 and the second cylindrical winding 241 is filled with insulating oil. In the present embodiment, the length in the axial direction of the first cylindrical winding 231 is the same as the length in the axial direction of the second cylindrical winding 241 positioned so as to be aligned with the first cylindrical winding 231. However, the axial lengths of the first cylindrical winding 231 and the second cylindrical winding 241 may be different from each other.

  In the first cylindrical winding unit 230, the first cylindrical winding 231 is wound in a coaxial cylindrical shape and positioned in a plurality of layers. The first cylindrical winding 231 has a structure in which the insulating paper 233 covers the periphery of the copper wire 232.

  In the present embodiment, the first cylindrical winding 231 is wound in five layers, but the number of layers is not limited to five, and may be a plurality of layers. Spacers (not shown) are provided between the layers of the first cylindrical winding 231. The spacer is formed of insulating paper such as a press board.

  The first cylindrical windings 231 are connected in series by being connected via interlayer connection portions that are alternately positioned on one end side or the other end side in the axial direction of the first cylindrical winding 231 between the respective layers. Note that the interlayer connection portion is a part of the first cylindrical winding 231.

  Specifically, the lower end side of the first cylindrical winding 231 located on the outermost side and the lower end side of the first cylindrical winding 231 located on the inner side thereof are connected by an interlayer connection portion 234a. Inside, the upper end sides of the adjacent first cylindrical windings 231 are connected to each other by an interlayer connection portion 234b. Inside, the lower end sides of the adjacent first cylindrical windings 231 are connected to each other by an interlayer connection portion 234c. Inside, the upper end sides of the adjacent first cylindrical windings 231 are connected to each other by an interlayer connection portion 234d.

  A plurality of insulating papers 238 are arranged at the lower ends of the first cylindrical windings 231 of each layer at intervals in the circumferential direction of the first cylindrical windings 231. In the present embodiment, the plurality of insulating papers 238 are formed so that the insulating paper 238 arranged outside the first cylindrical winding 231 is thicker than the insulating paper 238 arranged inside.

  At the upper end of the first cylindrical winding 231 of each layer, a plurality of insulating papers 239 having the same thickness are arranged at intervals in the circumferential direction of the first cylindrical winding 231. In the first cylindrical winding unit 230, the first cylindrical winding 231 is sandwiched between the insulating paper 238 and the insulating paper 239 so that the upper surface and the lower surface have flat surfaces.

  The second cylindrical winding unit 240 is positioned so as to be aligned with the first cylindrical winding unit 230 in the axial direction of the first cylindrical winding 231. In the second cylindrical winding unit 240, the second cylindrical winding 241 that is electrically connected in series with the first cylindrical winding 231 is wound in a coaxial cylindrical shape with the first cylindrical winding 231 to form a plurality of layers. Is located. The second cylindrical winding 241 has a structure in which the insulating paper 243 covers the periphery of the copper wire 242.

  In the present embodiment, the second cylindrical winding 241 is wound in five layers, but the number of layers is not limited to five, and may be a plurality of layers. Spacers (not shown) are provided between the layers of the second cylindrical winding 241. The spacer is formed of insulating paper such as a press board.

  The second cylindrical windings 241 are connected in series by being connected via interlayer connection portions that are alternately located on one end side or the other end side in the axial direction of the second cylindrical winding 241 between the respective layers. The interlayer connection portion is a part of the second cylindrical winding 241.

  Specifically, the lower end side of the second cylindrical winding 241 located on the innermost side and the lower end side of the second cylindrical winding 241 located on the outer side thereof are connected by an interlayer connection portion 244a. On the outside, the upper ends of the adjacent second cylindrical windings 241 are connected to each other by an interlayer connection 244b. On the outside, the lower end sides of the adjacent second cylindrical windings 241 are connected to each other by an interlayer connection portion 244c. On the outside, the upper ends of the adjacent second cylindrical windings 241 are connected to each other by an interlayer connection portion 244d.

  A plurality of insulating papers 248 are arranged at the upper ends of the second cylindrical windings 241 of the respective layers at intervals in the circumferential direction of the second cylindrical windings 241. In the present embodiment, the plurality of insulating papers 248 are formed so that the insulating paper 248 arranged outside the second cylindrical winding 241 is thicker than the insulating paper 248 arranged inside.

  At the lower end of the second cylindrical winding 241 of each layer, a plurality of insulating papers 249 having the same thickness are arranged at intervals in the circumferential direction of the second cylindrical winding 241. In the second cylindrical winding unit 240, the second cylindrical winding 241 is sandwiched between the insulating paper 248 and the insulating paper 249, so that the upper surface and the lower surface have flat surfaces.

  The insulating paper 220 is located between the first cylindrical winding unit 230 and the second cylindrical winding unit 240 and has an annular outer shape in plan view. In the present embodiment, the insulating paper 220 is constituted by a press board.

  The lower surface of the insulating paper 220 is in contact with the insulating paper 248 of the second cylindrical winding unit 240. The upper surface of the insulating paper 220 is in contact with the insulating paper 238 of the first cylindrical winding unit 230.

  The multiple cylindrical winding 200 has a connecting portion 254 that connects the first cylindrical winding 231 and the second cylindrical winding 241 to each other. In the present embodiment, the connection portion 254 includes an end portion of the first cylindrical winding 231 on the second cylindrical winding unit 240 side, and an end portion of the second cylindrical winding 241 on the first cylindrical winding unit 230 side. Is connected. The connecting portion 254 has a structure in which the insulating paper covers the copper wire. In the present embodiment, the first cylindrical winding 231 located on the innermost side and the second cylindrical winding 241 located on the innermost side are connected to each other by the connecting portion 254.

  Hereinafter, the potential difference generated between the first cylindrical winding 231 and the second cylindrical winding 241 will be described.

  When a lightning impulse is applied from the input-side line end 290, the high-voltage current flows in order from the outer first cylindrical winding 231 to the inner first cylindrical winding 231 in the order of an arrow 230a, an arrow 230b, an arrow 230c, an arrow It flows in the direction shown by 230d and arrow 230e.

  The high-voltage current passes through the connection portion 254 and enters the second cylindrical winding 241. The high-voltage current flows in the direction indicated by the arrow 240a, the arrow 240b, the arrow 240c, the arrow 240d, and the arrow 240e sequentially from the inner second cylindrical winding 241 toward the outer second cylindrical winding 241.

  Thus, when the lightning impulse is applied to the input side line end 290, the potential difference between the first cylindrical winding 231 located closest to the input side line end 290 and the first cylindrical winding 231 inside the first cylindrical winding 231 is provided. V is the highest.

  Since the multi-cylindrical winding 200 of the present embodiment is composed of a first cylindrical winding unit 230 and a second cylindrical winding unit 240, the first cylindrical winding 231 and the conventional multi-cylindrical winding are similar to the conventional multi-cylindrical winding. Compared with the case where the second cylindrical winding 241 is integrated with one cylindrical winding unit, the potential difference V generated between the layers can be reduced.

  Therefore, the interlayer distance L between the cylindrical windings can be shortened while maintaining a withstand voltage that can withstand a high voltage potential difference V due to factors such as lightning impulse. As a result, the multiple cylindrical winding 200 can be reduced in size.

  In the present embodiment, the distance between the end of the first cylindrical winding 231 on the second cylindrical winding unit 240 side and the end of the second cylindrical winding 241 on the first cylindrical winding unit 230 side is .., And becomes longer as the distance from the first cylindrical winding 231 and the second cylindrical winding 241 connected by the connecting portion 254 increases. Correspondingly, the thickness of the insulating papers 238 and 248 increases as the distance from the connecting portion 254 increases.

  With the above configuration, the first cylindrical winding 231 and the second cylindrical winding have a large potential difference while ensuring an insulation distance between the first cylindrical winding 231 and the second cylindrical winding 241 located on the outermost side. The number of turns of 241 can be larger than that of the multiple cylindrical winding 100 according to the first embodiment. Specifically, the number of turns of the first cylindrical winding 231 and the second cylindrical winding 241 located on the inner side can be made larger than that of the multiple cylindrical winding 100 according to the first embodiment. As a result, the space factor of the cylindrical winding can be increased, and the multiple cylindrical winding 200 can be further downsized than the multiple cylindrical winding 100.

  Hereinafter, the multiple cylindrical winding according to the third embodiment of the present invention will be described. Note that the multiple cylindrical winding 300 according to the present embodiment is different from the multiple cylindrical winding 200 according to the second embodiment only in that the connection portion includes the third cylindrical winding, and therefore the description of the other configurations will not be repeated.

(Embodiment 3)
FIG. 4 is a cross-sectional view of the multiple cylindrical winding according to Embodiment 3 of the present invention viewed from the same direction as FIG. As shown in FIG. 4, the multiple cylindrical winding 300 according to the third embodiment of the present invention includes an insulating cylinder 310, a third cylindrical winding 350 positioned outside the insulating cylinder 310, and a third cylindrical winding 350. The first cylindrical winding unit 330 located outside, the second cylindrical winding unit 340 located outside the third cylindrical winding 350 and below the first cylindrical winding unit 330, and the first cylindrical winding unit 330 And an insulating paper 320 positioned between the second cylindrical winding unit 340 and the second cylindrical winding unit 340.

  Each of the first cylindrical winding unit 330, the second cylindrical winding unit 340, and the insulating paper 320 has an opening through which the insulating cylinder 310 and the third cylindrical winding 350 can be inserted at the center. The insulating paper 320 is placed on the second cylindrical winding unit 340 in a state where the insulating cylinder 310 and the third cylindrical winding 350 are inserted in the respective central portions, and the first cylindrical winding unit 330 is placed on the insulating paper 320. Is placed.

  The input-side line end 390 is drawn from the upper end of the first cylindrical winding 331 located on the outermost side in the first cylindrical winding unit 330. An output-side line end 391 is drawn from the lower end of the second cylindrical winding 341 located on the outermost side in the second cylindrical winding unit 340.

  The multiple cylindrical winding 300 is used by being immersed in insulating oil. The interlayer between the first cylindrical winding 331 and the second cylindrical winding 341 is filled with insulating oil. In the present embodiment, the length in the axial direction of the first cylindrical winding 331 is the same as the length in the axial direction of the second cylindrical winding 341 positioned so as to be aligned with the first cylindrical winding 331. However, the axial lengths of the first cylindrical winding 331 and the second cylindrical winding 341 may be different from each other.

  In the first cylindrical winding unit 330, the first cylindrical winding 331 is wound in a coaxial cylindrical shape and is positioned in a plurality of layers. The first cylindrical winding 331 has a structure in which the insulating paper 333 covers the periphery of the copper wire 332.

  In the present embodiment, the first cylindrical winding 331 is wound in four layers, but the number of layers is not limited to four, and may be a plurality of layers. Spacers (not shown) are provided between the layers of the first cylindrical winding 331. The spacer is formed of insulating paper such as a press board.

  The first cylindrical windings 331 are connected in series by being connected via interlayer connection portions that are alternately located on one end side or the other end side in the axial direction of the first cylindrical winding 331 between the respective layers. The interlayer connection portion is a part of the first cylindrical winding 331.

  Specifically, the lower end side of the first cylindrical winding 331 located on the outermost side and the lower end side of the first cylindrical winding 331 located on the inner side thereof are connected by an interlayer connection portion 334a. On the inner side, the upper ends of the adjacent first cylindrical windings 331 are connected by an interlayer connection portion 334b. Inside, the lower end sides of the adjacent first cylindrical windings 331 are connected by an interlayer connection portion 334c.

  A plurality of insulating papers 338 are disposed at the lower ends of the first cylindrical windings 331 in each layer at intervals in the circumferential direction of the first cylindrical windings 331. In the present embodiment, the plurality of insulating papers 338 are formed so that the insulating paper 338 arranged outside the first cylindrical winding 331 is thicker than the insulating paper 338 arranged inside.

  A plurality of insulating papers 339 having the same thickness are disposed at the upper end of the first cylindrical winding 331 of each layer at intervals in the circumferential direction of the first cylindrical winding 331. In the first cylindrical winding unit 330, the first cylindrical winding 331 is sandwiched between the insulating paper 338 and the insulating paper 339 so that the upper surface and the lower surface have flat surfaces.

  The second cylindrical winding unit 340 is positioned so as to be aligned with the first cylindrical winding unit 330 in the axial direction of the first cylindrical winding 331. In the second cylindrical winding unit 340, a second cylindrical winding 341 electrically connected in series with the first cylindrical winding 331 is wound in a coaxial cylindrical shape with the first cylindrical winding 331 to form a plurality of layers. Is located. The second cylindrical winding 341 has a structure in which the insulating paper 343 covers the periphery of the copper wire 342.

  In the present embodiment, the second cylindrical winding 341 is wound in four layers, but the number of layers is not limited to four, and may be a plurality of layers. Spacers (not shown) are provided between the layers of the second cylindrical winding 341. The spacer is formed of insulating paper such as a press board.

  The second cylindrical windings 341 are connected in series by being connected via interlayer connection portions that are alternately positioned on one end side or the other end side in the axial direction of the second cylindrical winding 341 between the respective layers. The interlayer connection portion is a part of the second cylindrical winding 341.

  Specifically, the upper end side of the second cylindrical winding 341 located on the innermost side and the upper end side of the second cylindrical winding 341 located on the outer side thereof are connected by an interlayer connection portion 344a. On the outside, the lower ends of the adjacent second cylindrical windings 341 are connected to each other by an interlayer connection portion 344b. On the outside, the upper ends of the adjacent second cylindrical windings 341 are connected to each other by an interlayer connection portion 344c.

  A plurality of insulating papers 348 are arranged on the upper ends of the second cylindrical windings 341 in each layer at intervals in the circumferential direction of the second cylindrical winding 341. In the present embodiment, the plurality of insulating papers 348 are formed so that the insulating paper 348 disposed outside the second cylindrical winding 341 is thicker than the insulating paper 348 disposed inside.

  A plurality of insulating papers 349 having the same thickness are disposed at the lower ends of the second cylindrical windings 341 of the respective layers at intervals in the circumferential direction of the second cylindrical winding 341. In the second cylindrical winding unit 340, the second cylindrical winding 341 is sandwiched between the insulating paper 348 and the insulating paper 349 so that the upper surface and the lower surface have flat surfaces.

  The insulating paper 320 is positioned between the first cylindrical winding unit 330 and the second cylindrical winding unit 340 and has an annular outer shape in plan view. In the present embodiment, the insulating paper 320 is constituted by a press board.

  The lower surface of the insulating paper 320 is in contact with the insulating paper 348 of the second cylindrical winding unit 340. The upper surface of the insulating paper 320 is in contact with the insulating paper 338 of the first cylindrical winding unit 330.

  The multiple cylindrical winding 300 has a connecting portion that connects the first cylindrical winding 331 and the second cylindrical winding 341 to each other. In the present embodiment, the connecting portion includes a first cylindrical winding 331 and a second cylindrical winding 341 and a third cylindrical winding 350 wound around the same cylindrical shape.

  The third cylindrical winding 350 has a structure in which the insulating paper 353 covers the periphery of the copper wire 352. A plurality of insulating papers 358 are arranged at the upper end of the third cylindrical winding 351 at intervals in the circumferential direction of the third cylindrical winding 351. A plurality of insulating papers 359 are arranged at the lower end of the third cylindrical winding 351 at intervals in the circumferential direction of the third cylindrical winding 351.

  In the third cylindrical winding 350, one end is connected to the end of the first cylindrical winding 331 opposite to the second cylindrical winding unit 340 side by the connecting portion 354a, and the other end is connected to the second cylindrical winding 350. The end of the wire 341 opposite to the first cylindrical winding unit 330 is connected to the end of the wire 341 by a connecting portion 354b.

  The connecting portions 354a and 354b have a structure in which insulating paper covers the periphery of the copper wire. In the present embodiment, the first cylindrical winding 331 located on the innermost side and the second cylindrical winding 341 located on the innermost side are connected to each other via the connection portion 354a, the third cylindrical winding 350, and the connection portion 354b. It is connected.

  Hereinafter, the potential difference generated between the first cylindrical winding 331 and the second cylindrical winding 341 will be described.

  When a lightning impulse is applied from the input-side line end 390, the high-voltage current flows in order from the outer first cylindrical winding 331 to the inner first cylindrical winding 331 in the order of an arrow 330a, an arrow 330b, an arrow 330c, and an arrow. It flows in the direction indicated by 330d.

  The high-voltage current passes through the connection portion 354a and enters the third cylindrical winding 350. The high voltage current flows through the third cylindrical winding 350 in the direction indicated by the arrow 350a.

  Further, the high-voltage current passes through the connection portion 354 b and enters the second cylindrical winding 341. The high-voltage current flows in the direction indicated by the arrow 340a, the arrow 340b, the arrow 340c, and the arrow 340d sequentially from the inner second cylindrical winding 341 toward the outer second cylindrical winding 341.

  Thus, when the lightning impulse is applied to the input side line end 390, the potential difference between the first cylindrical winding 331 located closest to the input side line end 390 and the first cylindrical winding 331 inside thereof. V is the highest.

  Since the multiple cylindrical winding 300 of the present embodiment is composed of the first cylindrical winding unit 330 and the second cylindrical winding unit 340, the first cylindrical winding 331 and the conventional cylindrical winding 331 are similar to the conventional multiple cylindrical winding. Compared with the case where the second cylindrical winding 341 is integrated with one cylindrical winding unit, the potential difference V generated between the layers can be reduced.

  Therefore, the interlayer distance L between the cylindrical windings can be shortened while maintaining a withstand voltage that can withstand a high voltage potential difference V due to factors such as lightning impulse. As a result, the multiple cylindrical winding 300 can be reduced in size.

  In the present embodiment, the distance between the end of the first cylindrical winding 331 on the second cylindrical winding unit 340 side and the end of the second cylindrical winding 341 on the first cylindrical winding unit 330 side is The length increases as the distance from the first cylindrical winding 331 and the second cylindrical winding 341 connected by the connecting portion increases. Correspondingly, the thicknesses of the insulating papers 338 and 348 increase as the distance from the connection portion increases.

  With the above configuration, the first cylindrical winding 331 and the second cylindrical winding have a large potential difference while ensuring an insulation distance between the first cylindrical winding 331 and the second cylindrical winding 341 located on the outermost side. The number of turns of 341 can be made larger than that of the multiple cylindrical winding 100 according to the first embodiment. Specifically, the number of turns of the first cylindrical winding 331 and the second cylindrical winding 341 located inside is the first cylindrical winding 131 and the second cylinder located inside the multiple cylindrical winding 100 according to the first embodiment. The number of turns of the winding 141 can be increased. Also, by providing the third cylindrical winding 350, the number of turns of the cylindrical winding can be made larger than that of the multiple cylindrical winding 100. As a result, the space factor of the cylindrical winding can be increased, and the multiple cylindrical winding 300 can be further downsized than the multiple cylindrical winding 100.

  Hereinafter, experimental results obtained by simulating potential vibration generated when a lightning impulse is applied in the multiple cylindrical winding of the comparative example and the multiple cylindrical winding of the example according to the third embodiment will be described.

(Experimental example)
FIG. 5 is a schematic diagram illustrating a configuration of a multiple cylindrical winding according to a comparative example. FIG. 6 is a schematic diagram illustrating the configuration of the multiple cylindrical winding according to the embodiment.

  As shown in FIG. 5, in the multiple cylindrical winding of the comparative example, the cylindrical winding 940 is wound in five layers in a coaxial cylindrical shape. An input-side line end 990 is drawn from the upper end of the innermost cylindrical winding 940. An output side line end 992 is drawn from the lower end of the outermost cylindrical winding 940. The output line end 992 is fixed to the ground potential.

In the multiple cylindrical winding of the comparative example, a potential difference between layers between the upper end of the third cylindrical winding 948 and the upper end of the fourth cylindrical winding 949 from the inside is V ₁ .

  As shown in FIG. 6, in the multiple cylindrical winding of the embodiment, the first cylindrical winding 330 is wound in four layers in a coaxial cylindrical shape. Below the first cylindrical winding 330, the second cylindrical winding 340 is wound in four layers in a coaxial cylindrical shape. A third cylindrical winding 350 is disposed inside the first cylindrical winding 330 and the second cylindrical winding 340.

  An input-side line end 390 is drawn from the upper end of the first cylindrical winding 330 located on the outermost side. An output-side line end 392 is drawn from the lower end of the second cylindrical winding 340 located on the outermost side. The output line end 392 is fixed to the ground potential.

In the multiple cylindrical winding of the embodiment, the potential difference between the upper ends of the first cylindrical winding 335 of the third layer and the upper end of the first cylindrical winding 336 of the fourth layer is V ₂ from the outside.

  FIG. 7 is a graph showing a potential oscillation generated when a lightning impulse is applied to the multiple cylindrical winding of the comparative example. FIG. 8 is a graph showing a potential oscillation generated when a lightning impulse is applied to the multiple cylindrical winding of the example. 7 and 8, the vertical axis represents the normalized generated potential, and the horizontal axis represents the elapsed time.

As shown in FIGS. 7 and 8, the maximum potential difference V ₂ generated between the first cylindrical winding 335 and the first cylindrical winding 336 of the multi-cylindrical winding of the embodiment is the same as that of the multi-cylindrical winding of the comparative example. The maximum potential difference V ₁ generated between the cylindrical winding 948 and the cylindrical winding 949 was about 40% lower.

  From this experimental result, it was confirmed that the multiple cylindrical winding of the example can reduce the potential difference generated between the layers of the cylindrical winding as compared with the multiple cylindrical winding of the comparative example. Therefore, in the multiple cylindrical winding according to the present invention, it is possible to reduce the size by shortening the interlayer distance of the cylindrical winding while maintaining the insulation distance.

  In addition, the said embodiment and experiment example disclosed this time are illustrations in all the points, Comprising: It does not become the 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, 200, 300 Multiple cylindrical winding, 110, 210, 310 Insulating cylinder, 120, 133, 138, 139, 143, 148, 149, 220, 233, 238, 239, 243, 248, 249, 320, 333 338, 339, 343, 348, 349, 353, 358, 359 Insulating paper, 130, 230, 330 First cylindrical winding unit, 131, 231, 331, 335, 336 First cylindrical winding, 132, 142, 232 , 242, 332, 342, 352 Copper wire, 134a, 134b, 134c, 134d, 144a, 144b, 144c, 144d, 234a, 234b, 234c, 234d, 244a, 244b, 244c, 244d, 334a, 334b, 334c, 344a , 344b, 344c Interlayer connection part, 140 240, 340 Second cylindrical winding unit, 141, 241, 340, 341 Second cylindrical winding, 154, 254, 354a, 354b Connection portion, 190, 290, 390, 990 Input side line end, 191, 291, 391 , 392, 992 Output side line end, 350, 351 Third cylindrical winding, 940, 948, 949 Cylindrical winding.

Claims (5)

A multi-cylinder winding used by being immersed in insulating oil,
A first cylindrical winding unit in which a first cylindrical winding is wound in a coaxial cylindrical shape and positioned in a plurality of layers;
A second cylindrical winding that is positioned in line with the first cylindrical winding unit in the axial direction of the first cylindrical winding and is electrically connected in series with the first cylindrical winding is the first cylindrical winding. A second cylindrical winding unit wound in a coaxial cylinder with the wire and positioned in a plurality of layers;
An insulating paper having an annular shape in plan view, located between the first cylindrical winding unit and the second cylindrical winding unit;
An innermost first cylindrical winding and an innermost second cylindrical winding, or an outermost first cylindrical winding and an outermost second cylindrical winding; A multi-cylindrical winding comprising: a connecting portion connected to each other.   2. The multiple cylinder according to claim 1, wherein a length in the axial direction of the first cylindrical winding is the same as a length in the axial direction of the second cylindrical winding positioned so as to be aligned with the first cylindrical winding. Winding.   The distance between the end portion of the first cylindrical winding on the second cylindrical winding unit side and the end portion of the second cylindrical winding on the first cylindrical winding unit side is connected by the connecting portion. 3. The multi-cylindrical winding according to claim 1, wherein the multi-cylindrical winding becomes longer as the distance from the first cylindrical winding and the second cylindrical winding increases.   The connection portion connects an end portion of the first cylindrical winding on the second cylindrical winding unit side and an end portion of the second cylindrical winding on the first cylindrical winding unit side. The multiple cylindrical winding according to any one of 1 to 3. The connecting portion includes a third cylindrical winding wound coaxially with the first cylindrical winding and the second cylindrical winding,
In the third cylindrical winding, one end is connected to an end portion of the first cylindrical winding opposite to the second cylindrical winding unit side, and the other end is connected to the second cylindrical winding. The multiple cylindrical winding according to any one of claims 1 to 3, wherein the multiple cylindrical winding is connected to an end opposite to the first cylindrical winding unit.

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