Coil for stationary induction apparatus, and stationary induction apparatus

Abstract

To provide a coil for a stationary induction apparatus capable of achieving both improvement in cooling performance and reduction in burden during manufacturing, and to provide a stationary induction apparatus.SOLUTION: The coil 2 of the stationary induction apparatus 1 according to the embodiment is formed by arranging, in the thickness direction of the plate-shaped coil 6, the plurality of plate-shaped coils 6 in each of which the conductor 7 provided with the insulating coating 9 is concentrically wound, and in the plate-shaped coil 6, the inter-conductor insulator 10 formed of an insulating material and forming a predetermined interval between the conductors 7 is arranged between the conductors 7 on the inner peripheral side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] FIELD OF THE INVENTION The present invention relates to a coil for a stationary induction machine, a stationary induction machine. [Background technology]

[0002] Conventionally, coils for static induction equipment such as shell-type static devices have been formed by stacking multiple disc-shaped coils in the thickness direction, each of which is made of a concentrically wound insulating conductor, as described in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5709623 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the coil is attached to the core, the inner periphery of the coil is more difficult to cool than the outer periphery. Also, because the corners of the inner periphery have a smaller radius than the outer periphery, the coil is more susceptible to stress during manufacturing, which can easily damage the insulating coating.

[0005] Therefore, the present invention provides a coil for a stationary induction device, and a stationary induction device, which can achieve both improved cooling performance and reduced manufacturing costs. [Means for solving the problem]

[0006] The coil for a stationary induction device according to the embodiment is formed by arranging a plurality of disc-shaped coils, each of which is made of a concentrically wound insulating conductor, in the thickness direction of the disc-shaped coil, and the disc-shaped coil has inter-conductor insulators, made of an insulating material, arranged between the conductors on the inner periphery, which form a predetermined gap between the conductors.

[0007] A stationary induction device according to an embodiment includes the above-described coil and an iron core to which the coil is attached. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating a configuration example of a stationary induction device according to an embodiment. [Figure 2] FIG. 1 is a diagram showing a schematic configuration example of a disc-shaped coil. [Figure 3] FIG. 10 is a diagram showing an example of the installation of a disc-shaped coil; [Figure 4] FIG. 1 is a comparative example, and is a diagram schematically illustrating a conventional configuration. [Figure 5] Schematic diagram of another coil configuration example (part 1) [Figure 6] Diagram 2 showing a schematic example of another coil configuration DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment will be described with reference to the drawings. As shown in Fig. 1, a stationary induction device 1 according to this embodiment includes a coil 2 and an iron core 3 to which the coil 2 is attached. The iron core 3 is of a so-called three-legged type, with the coil 2 attached to the central leg. In other words, the stationary induction device 1 has a so-called shell-type configuration. The iron core 3 and the coil 2 are placed in a housing 4 (see Fig. 4) filled with cooling oil, and are cooled by forcibly circulating the cooling oil using a pump 5 (see Fig. 4).

[0010] The coil 2 is formed by arranging a plurality of roughly disc-shaped coils 6 in the thickness direction, as partially shown in Fig. 1. This disc-shaped coil 6 is formed by concentrically winding a conductor 7, as shown in Fig. 2(a) when viewed from the thickness direction. In this specification, the conductor 7 refers to, for example, a rectangular conductor 8 with an insulating coating 9, as shown in Fig. 2(b) in cross section of a bb wire.

[0011] The disc-shaped coil 6 is formed in a generally rounded rectangular shape having a relatively long linear portion extending in the longitudinal direction (left-right direction) and a relatively short linear portion extending in the lateral direction (up-down direction) in the figure, and has a generally rectangular insertion hole 61 formed in the center into which the leg portion of the iron core 3 is inserted. This disc-shaped coil 6 is formed by winding the conductor 7 about 100T, assuming that one circumference of the conductor 7 is one turn (1T). However, the shapes and number of turns of the conductor 7 and the disc-shaped coil 6 are merely examples and are not limited to these.

[0012] Furthermore, in the disc-shaped coil 6, inter-conductor insulators 10 made of an insulating material are disposed between the conductors 7 on the inner periphery. In this embodiment, the inner periphery is defined as a range closer to the inner periphery than half the width of the coil 2. In the example of FIG. 2(a), the inter-conductor insulators 10 are disposed between the conductors 7 on the inner periphery, between the first turn and, for example, the fourth turn, without being exposed to the inside of the disc-shaped coil 6. In other words, in this embodiment, the inter-conductor insulators 10 are disposed within a range of about several percent of the total number of turns. This is to prevent the outer dimensions of the coil 2 from becoming excessively large, as will be described later. Note that the range in which the inter-conductor insulators 10 are disposed is merely an example and is not limited to this.

[0013] As shown in an enlarged partial view, this inter-conductor insulator 10 is placed between the conductors 7, for example, by being attached to the surface of the conductors 7 and then being wound together with the conductors 7. Note that in FIG. 2(a), a gap is intentionally provided between the conductors 7 and the inter-conductor insulator 10 for the sake of explanation, but in reality, they are wound in close contact with each other. After winding, the inter-conductor insulator 10 is fixed in place with an adhesive or the like to prevent it from shifting position.

[0014] Furthermore, since the disc-shaped coil 6 has inter-conductor insulators 10 disposed between the conductors 7, the gaps (Δd1) between the turns of the conductor 7 along the short direction and the gaps (Δd2) between the turns of the conductor 7 along the long direction are relatively wider on the inner peripheral side than when the inter-conductor insulators 10 are not disposed. Furthermore, the disc-shaped coil 6 has adjusting insulators 11 disposed between the conductors 7 on the outer peripheral side to ensure that its outer shape is a specified size.

[0015] Fig. 3 shows a partial cross section of the stationary induction device 1 shown in Fig. 1 at a position corresponding to line bb shown in Fig. 2(a). As shown in Fig. 3, the stacked disc-shaped coil 6 is supported on its inner periphery by inner corner insulators 12 and on its outer periphery by outer corner insulators 13. The inner corner insulators 12 have inner wall portions 12a that cover several turns of conductor 7 from the inner periphery of the disc-shaped coil 6, and the outer corner insulators 13 have outer wall portions 13a that cover several turns of conductor 7 from the outer periphery of the disc-shaped coil 6.

[0016] These inner corner insulators 12 and outer corner insulators 13 are fixed to inner spacers 14 and outer spacers 15, respectively, which are arranged between the iron core 3. Inter-coil insulating plates 16 are also arranged between the disc-shaped coils 6 so as to contact the respective disc-shaped coils 6. Therefore, some of the inner conductors 7 of each disc-shaped coil 6 have their upper or lower ends in contact with the inner corner insulators 12, and their opposite ends in contact with the inter-coil insulating plates 16. In other words, the upper and lower surfaces of the inner conductors 7 are covered by the insulators. The shapes and fixing manners of the inner corner insulators 12, outer corner insulators 13, inner spacers 14, and outer spacers 15 are merely examples and are not intended to be limiting.

[0017] The disc-shaped coil 6 has inter-conductor insulators 10 disposed between the conductors 7 on the inner periphery. In this embodiment, the inter-conductor insulators 10 are disposed at least between the conductors 7 covered by the inner periphery side wall portion 12a. Note that the configuration shown in FIG. 3 is an example, and the shapes and fixing manner of the inner periphery side corner insulators 12, outer periphery side corner insulators 13, inner periphery side spacers 14, and outer periphery side spacers 15 are not limited to this. For example, the inner periphery side wall portion 12a may be shaped to cover conductors 7 with a fewer number of turns or a greater number of turns.

[0018] Next, the operation and effect of the above-described configuration will be described. First, a conventional general configuration and its problems will be described with reference to Fig. 4. Hereinafter, the conventional configuration will be referred to as the conventional type for convenience, but the same reference numerals will be used to designate parts that are common to this embodiment.

[0019] A conventional stator 101 shown in Fig. 4(a) includes an iron core 3 and a conventional coil 102 attached to the iron core 3. This conventional coil 102 is formed by stacking multiple conventional disc-shaped coils 106, each of which has a conductor 7 wound concentrically, in the thickness direction, as shown in Fig. 4(b). However, no inter-conductor insulator 10 is disposed in the conventional disc-shaped coil 106.

[0020] Incidentally, the conventional disc-shaped coil 106 may also have an adjustment insulator 11 disposed thereon. However, since the adjustment insulator 11 is disposed to adjust the outer diameter as described above, it is disposed as necessary on the outer periphery of the conventional disc-shaped coil 106 when it is determined that the outer diameter will be smaller than the specified size while measuring the dimensions during winding, that is, when the winding of the conductor 7 approaches the final stage. Therefore, even if the adjustment insulator 11 or a similar object is disposed on the outer periphery of the conventional disc-shaped coil 106, it can be said that this does not give rise to the configuration in which the inter-conductor insulator 10 is disposed as in this embodiment.

[0021] In the case of conventional stator 101, when pump 5 is driven, cooling oil flows into housing 4 as shown by arrow Fi, flows longitudinally between the legs of iron core 3 and between conventional plate-shaped coils 106, and then circulates so as to flow out of housing 4 as shown by arrow Fo. Although not shown, a heat exchanger, conservator, etc. are provided in the oil circulation path.

[0022] When the temperature distribution of this conventional stator 101 was measured, it was confirmed that the temperature on the inner periphery side, shown as the range (X1) in Figure 4(a), was relatively higher than that on the outer periphery side, and that there were areas where the temperature was locally high. It was also confirmed that the downstream range (X3) in the direction of the cooling oil flow was relatively higher than the upstream range (X2).

[0023] The cause of this was thought to be a relatively low cooling effect on the inner conductor 7. Specifically, as shown in FIG. 4(b), the inner conductor 7 of each conventional disc-shaped coil 106 has its upper or lower end in contact with the inner corner insulator 12 within the inner range (X1), and its opposite end in contact with the inter-coil insulating plate 16, so that its upper and lower surfaces are blocked by the insulator. Furthermore, the left and right sides of the inner conductor 7 are blocked by the inner corner insulator 12 and other conductors 7. Therefore, it was presumed that the surface of the inner conductor 7 is prevented from contacting the oil passage for the cooling oil, resulting in a decrease in cooling efficiency and a rise in temperature.

[0024] Therefore, in this embodiment, as shown in Fig. 3, inter-conductor insulators 10 are arranged between the conductors 7 on the inner periphery side, thereby reducing the density of the conductors 7 in the inner periphery area (X1), or more precisely, the density of the conductors 8 that are the heat source. This reduces the amount of heat generated in the inner periphery area (X1), making it possible to prevent the temperature on the inner periphery side of the disc-shaped coil 6 from becoming relatively high. Furthermore, since this area is downstream of the cooling oil, the temperature of the cooling oil itself becomes high, and it is also possible to reduce the amount of heat generated in the area (X3) where the cooling oil is obstructed by the legs.

[0025] Furthermore, by disposing the inter-conductor insulator 10, the gaps (Δd1) and (Δd2) between the turns of the conductor 7 become relatively wider, as shown in the partially enlarged view of FIG. 2(a). This relatively increases the radius of the corners connecting the short and long sides, making it possible to reduce the load applied to the conductor 7 during winding and reducing the risk of damage to the insulating coating 9. Furthermore, even though the radius becomes relatively larger, the conductor 7 is bent with a radius that is relatively small compared to the conductor 7. This prevents the conductors 7 from rubbing against each other during winding, which could damage the insulating coating 9, and thus reduces the occurrence of dielectric breakdown.

[0026] According to the embodiment described above, the following effects can be obtained. The coil 2 for the stationary induction device 1 according to the embodiment is formed by arranging a plurality of disc-shaped coils 6 in the thickness direction of the disc-shaped coils 6, each of which is formed by concentrically winding a conductor 7 with an insulating coating 9, and the disc-shaped coils 6 have inter-conductor insulators 10 made of an insulating material arranged between the conductors 7 on the inner periphery thereof, which form a predetermined gap between the conductors 7.

[0027] This reduces the density of the conductor 7 on the inner periphery of the disc-shaped coil 6, thereby reducing the amount of heat generated on the inner periphery and preventing the temperature on the inner periphery from becoming relatively high. Furthermore, by providing the inter-conductor insulator 10, the gaps between the turns of the conductor 7 become relatively wider, which makes it possible to relatively increase the radius of the corners connecting the short and long sides and reduce the load applied to the conductor 7 during winding. Therefore, it is possible to simultaneously improve the cooling performance of the coil 2 and reduce the risk of damage to the conductor 7 during winding in manufacturing.

[0028] Furthermore, the stationary induction device 1 equipped with the coil 2 described above can also achieve the various effects described above, such as simultaneously improving the cooling performance of the coil 2 and reducing the risk of damage during winding. The same applies to the case where the coil 2 is formed of a disc-shaped coil 6 having another configuration, as exemplified below.

[0029] Furthermore, the inter-conductor insulators 10 are arranged in a portion along the longitudinal direction of the disc-shaped coil 6 when viewed from the thickness direction of the disc-shaped coil 6. In this case, as in the disc-shaped coil 6a shown in FIG. 5(a), the inter-conductor insulators 10 can be arranged only in a portion along the longitudinal direction of the disc-shaped coil 6. In this case, the inter-conductor insulators 10 can be arranged within a range of one to several turns from the inner periphery. This configuration also reduces the amount of heat generated on the inner periphery, improving cooling performance and reducing the risk of damage during manufacturing. Furthermore, by arranging the inter-conductor insulators as shown in FIG. 5(a), the amount of inter-conductor insulator 10 used can be reduced.

[0030] Furthermore, when viewed from the thickness direction of the disc-shaped coil 6, the inter-conductor insulators 10 are arranged in the longitudinal direction of the disc-shaped coil 6 and at the corners that connect to the lateral direction. In this case, as in the disc-shaped coil 6b shown in FIG. 5(b), the inter-conductor insulators 10 can be arranged only in the longitudinal direction and at the corners that connect to the lateral direction. In this case, the inter-conductor insulators 10 can be arranged within one to several turns from the inner periphery. This configuration also reduces the amount of heat generated on the inner periphery, improving cooling performance and reducing the risk of damage during manufacturing. Furthermore, by arranging the inter-conductor insulators 10 except for the linear portions in the lateral direction as shown in FIG. 5(b), the amount of inter-conductor insulator 10 used can be reduced.

[0031] Furthermore, when viewed from the thickness direction of the disc-shaped coil 6, the inter-conductor insulator 10 is disposed in a portion along the short side of the disc-shaped coil 6. In this case, as in the disc-shaped coil 6c shown in FIG. 5(c), the inter-conductor insulator 10 can be disposed only in a portion along the short side. In this case, the inter-conductor insulator 10 can be disposed within a range of one to several turns from the inner periphery. This configuration also reduces the amount of heat generated on the inner periphery, improving cooling performance and reducing the risk of damage during manufacturing. Furthermore, since the inter-conductor insulator 10 is located downstream of the cooling oil, the temperature of the cooling oil itself increases, and the amount of heat generated in the area (X3) where the cooling oil is obstructed by the legs can be reduced. Furthermore, by disposing the inter-conductor insulator 10 as shown in FIG. 5(c), the amount of inter-conductor insulator 10 used can be reduced.

[0032] Furthermore, when viewed from the thickness direction of the disc-shaped coil 6, the inter-conductor insulators 10 are arranged in the portions along the short sides of the disc-shaped coil 6 and at the corners that connect in the longitudinal direction. In this case, as in the disc-shaped coil 6d shown in FIG. 5(d), the inter-conductor insulators 10 can be arranged only in the portions along the short sides and at the corners that connect in the longitudinal direction. In this case, the inter-conductor insulators 10 can be arranged within a range of one to several turns from the inner periphery. This configuration also reduces the amount of heat generated on the inner periphery, improving cooling performance and reducing the risk of damage during manufacturing. Furthermore, by excluding the linear portions in the longitudinal direction as shown in FIG. 5(d), the amount of inter-conductor insulator 10 used can be reduced.

[0033] Furthermore, when viewed from the thickness direction of the disc-shaped coil 6, the inter-conductor insulators 10 are arranged in the longitudinal direction of the disc-shaped coil 6, at least one of the lateral directions, and at the corners connecting the longitudinal and lateral directions. In this case, as shown in FIG. 5(e), a disc-shaped coil 6e can be configured in which the inter-conductor insulators 10 are arranged in the longitudinal direction, only one of the lateral directions, and at the corners connecting the longitudinal and lateral directions. In this case, the inter-conductor insulators 10 can be arranged within one to several turns from the inner periphery. This configuration also reduces the amount of heat generated on the inner periphery, improving cooling performance and reducing the risk of damage during manufacturing. Furthermore, the arrangement shown in FIG. 5(e) can reduce the amount of inter-conductor insulator 10 used.

[0034] Furthermore, as in the disc-shaped coil 6f shown in Figures 6(a) and 6(b), a configuration can be adopted in which an inter-conductor insulator 10 is further disposed on the outer periphery of the disc-shaped coil 6. In this case, the inter-conductor insulator 10 can be disposed within a range of one to several turns from the outer periphery. Note that while Figure 6 shows an example in which an inter-conductor insulator 10 is further disposed on the outer periphery of the disc-shaped coil 6 shown in Figure 2, a configuration in which the inter-conductor insulator 10 is disposed on the outer periphery of the disc-shaped coils 6a to 6e shown in Figure 5 can also be adopted. In this case, the range (R1) in which the inter-conductor insulator 10 is disposed can be appropriately set to the range covered by the outer corner member, the range of several turns from the outer periphery, or the like.

[0035] This configuration also reduces the amount of heat generated on the inner periphery side, improving cooling performance, and reduces the risk of damage during manufacturing, while reducing the density of the conductor 7 on the outer periphery side, improving cooling performance of the coil 2. Furthermore, by arranging the inter-conductor insulator 10 in place of the adjusting insulator 11, or by arranging it together with the adjusting insulator 11, the outer shape of the coil 2 can also be adjusted.

[0036] Although the coil 2 in the embodiment has been exemplified as a rounded rectangular shape, the outer shape may also be a rounded square, an ellipse without linear portions on the outer edge, etc. In this case, the various effects described above can be obtained by arranging the inter-conductor insulator 10 based on the longitudinal and lateral directions of the insertion hole 61, which is roughly rectangular when viewed in the thickness direction.

[0037] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0038] In the drawing, 1 denotes a stationary induction device, 2 denotes a coil, 3 denotes an iron core, 6, 6a to 6f denote disc coils, 7 denotes a conductor, and 10 denotes an inter-conductor insulator.

Claims

1. The coil is formed by arranging a plurality of disc-shaped coils, each of which is formed by concentrically winding an insulating-coated conductor, in the thickness direction of the disc-shaped coil, The disc-shaped coil is a coil for a stationary induction device in which an inter-conductor insulator made of an insulating material is arranged between the conductors on the inner periphery, forming a predetermined gap between the conductors.

2. 2. The coil for a stationary induction device according to claim 1, wherein the inter-conductor insulator is arranged at a position along the longitudinal direction of the disc-shaped coil when viewed from the thickness direction of the disc-shaped coil.

3. A coil for a stationary induction device as described in claim 1, wherein the inter-conductor insulator is arranged in a portion along the longitudinal direction of the disc-shaped coil and in a corner portion connected in the lateral direction when the disc-shaped coil is viewed from the thickness direction.

4. 2. The coil for a stationary induction device according to claim 1, wherein the inter-conductor insulator is disposed in a position along the short side of the disc-shaped coil when viewed from the thickness direction of the disc-shaped coil.

5. A coil for a stationary induction device as described in claim 1, wherein the inter-conductor insulator is arranged in a portion along the short side of the disc-shaped coil and in a corner portion connected in the long side when viewed from the thickness direction of the disc-shaped coil.

6. A coil for a stationary induction device as described in claim 1, wherein the inter-conductor insulator is arranged in the longitudinal direction of the disc-shaped coil, in at least one of the lateral directions, and at a corner connecting the longitudinal direction and the lateral direction when the disc-shaped coil is viewed from the thickness direction.

7. 2. The coil for a stationary induction device according to claim 1, wherein the inter-conductor insulator is disposed between the conductors on the outer periphery.

8. A coil according to any one of claims 1 to 7; and an iron core to which the coil is attached.

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