JP3933347B2 - Winding for static induction equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a winding for a stationary induction device that is used in, for example, a transformer and has a winding configuration called a multiple cylindrical winding or a multiple rectangular tube winding.
[0002]
[Prior art]
An example of the multiple cylindrical winding is shown in FIG. As shown in FIG. 10, the conductor 1 is wound in a cylindrical shape so as to be aligned along the winding axis direction to form one conductor layer 2, and a sheet-like sheet is formed outside the conductor layer 2 as necessary. The next conductor layer 2 is formed by winding it through an interlayer insulator 3, and then a plurality of conductor layers 2 are stacked in a concentric cylinder until the required number of turns is reached, thereby forming a multi-cylindrical winding 4 is doing. The multi-cylindrical winding 4 has an excellent characteristic that the potential distribution at the time of surge voltage intrusion is uniform and the potential oscillation is small, and the winding of the winding is easy to automate. It is also used in large power transformers. Here, when the winding is enlarged, as shown in FIG. 10, a coolant flow path 5 is provided between the conductor layers 2 to flow a coolant for cooling the winding. The refrigerant flow path 5 is formed by disposing a rod-shaped duct piece 6 between the conductor layers 2.
[0003]
FIG. 11 is a cross-sectional view of the multiple cylindrical winding 4. In the case of the configuration shown in FIG. 11, five conductor layers 2 (that is, the first layer, the second layer, the third layer, the fourth layer, and the fifth layer) are overlapped and wound from the inside of the winding. . In this case, the first layer is formed by winding the conductor 1 from above to below, and then crosses to the second layer at the crossover portion 7, and the second layer moves the conductor 1 from below to above. It is formed by winding. Similarly, the third layer is wound from above to below, the fourth layer is wound from below to above, and the fifth layer is wound from above to below. A refrigerant flow path 5 is appropriately provided between the conductor layers 2.
[0004]
In the multi-cylindrical winding 4 having the above-described configuration, the potential difference (voltage difference) between the first layer and the second layer is (the number of turns for two layers) × (the induced electromotive force per turn) at the upper end of the winding. And a potential difference does not occur at the lower end. On the other hand, between the second layer and the third layer, a potential difference is generated at the lower end of the winding, and no potential difference is generated at the upper end. For this reason, in the high-voltage multiple cylindrical winding 4, the thickness of the interlayer insulator 3 and the refrigerant flow path 5 is made thicker on the side where the potential difference occurs and thinner on the side where the potential difference does not occur. The size is made as small as possible.
[0005]
By the way, regarding the insulation performance between the conductor layers 2, when the interlayer insulator 3 and the refrigerant flow path 5 are compared, the interlayer insulator 3 is solid insulation, whereas the refrigerant flowing in the refrigerant flow path 5 is insulating oil or the like. Therefore, the interlayer insulator 3 is superior in insulation performance. Therefore, in order to obtain the same insulation strength, it is necessary to make the thickness dimension (insulation distance) of the coolant channel 5 thicker than the interlayer insulator 3.
[0006]
Further, when the interlayer insulator 3 is used, the weakest point in insulation is a portion where the electric field is concentrated at the end portion where the maximum potential difference is generated. Specifically, the wedge shown by a in FIG. It is a gap part. For this reason, the thickness dimension of the interlayer insulator 3 is determined so that the electric field in the wedge gap portion is equal to or less than the dielectric breakdown allowable value. Since the maximum thickness of the interlayer insulator 3 determined in this way is much larger than the penetration breakdown strength of the interlayer insulator 3, when changing the thickness of the interlayer insulator 3 according to the potential difference between the layers, Only the number of sheets constituting the insulator 3 is appropriately changed so that the thicker side is increased and the thinner side is decreased.
[0007]
On the other hand, since the coolant channel 5 does not have a wedge gap shape as shown in FIG. 12, the insulation strength of the coolant channel 5 is uniquely determined by its thickness. And when changing the thickness of the refrigerant | coolant flow path 5, the structure which inclines in the thickness dimension of the duct piece 6 and reduces thickness by a fixed rate from the maximum thickness is employ | adopted. Here, the method shown in FIG. 13 and the method shown in FIG. 14 are adopted as a method of providing an inclination in the thickness dimension of the duct piece 6.
[0008]
In the method shown in FIG. 13, when the duct piece 6 is cut out from the laminate of the original plate 8 that is a plate-like member, a predetermined inclination is provided as indicated by the cutting line S1. On the other hand, in the method shown in FIG. 14, by performing machining (for example, cutting) on the duct piece cut out along the cutting line S2 from the laminate of the original plate 8, the inclined surface 6a is provided, A predetermined inclination is provided in the thickness dimension of the duct piece 6.
[0009]
[Problems to be solved by the invention]
Since the duct piece 6 is configured by laminating, for example, an original plate 8 which is a plate-like member, when the duct piece 6 manufactured by the method shown in FIG. The stacking direction of the original plate 8 is the direction along the potential difference direction between the conductor layers 2. For this reason, there existed a malfunction that the withstand voltage performance of the duct piece 6 fell.
[0010]
On the other hand, when the duct piece 6 created by the method shown in FIG. 14 is used for the multiple cylindrical winding 4, the stacking direction of the original plate 8 of the duct piece 6 is orthogonal to the potential difference direction between the conductor layers 2. The insulation performance is improved and the withstand voltage performance is increased. However, in the case of the method shown in FIG. 14, there is a problem that the yield of the material is lowered because the laminated member is cut by machining.
[0011]
Accordingly, an object of the present invention is to provide a winding for a stationary induction device that can sufficiently increase the withstand voltage performance of a duct piece and can prevent a decrease in the yield of the material.
[0012]
[Means for Solving the Problems]
The winding for stationary induction device according to the present invention is a multi-cylindrical winding formed by winding a conductor in a cylindrical shape so as to overlap a plurality of layers. A path is provided, and the thickness dimension of the portion corresponding to the portion where the voltage difference generated between the conductor layers in the coolant channel is large is increased, and the portion corresponding to the portion where the voltage difference generated between the conductor layers in the coolant channel is small. In a coil for stationary induction equipment configured to reduce the thickness dimension of the portion, a rod-shaped duct piece for securing the refrigerant flow path between the conductor layers is disposed so as to extend along the axial direction between the conductor layers. And the thickness of the duct piece is changed stepwise, the duct piece is formed by laminating plate members, and the outer conductor of the plate members of the duct piece is further configured. A plate-like member adjacent to the layer, Characterized in was positioned across the step portion of the Kutopisu.
[0013]
According to the said structure, it comprises so that the thickness dimension of a duct piece may be changed in steps , the said duct piece is comprised by laminating | stacking a plate-shaped member, Furthermore, the outer side of the plate-shaped member of the said duct piece Since the plate-like member adjacent to the conductor layer is disposed so as to straddle the step portion of the duct piece, while configuring the stacking direction of the plate-like member of the duct piece to be orthogonal to the potential difference direction between the conductor layers, It is only necessary to appropriately change the number of laminated plate-like members, and machining such as cutting becomes unnecessary. Therefore, the withstand voltage performance of the duct piece can be made sufficiently high, and a decrease in the yield of the material can be prevented.
[0014]
Moreover, in the case of the said structure, while configuring the said duct piece by laminating | stacking a commercially available plate-shaped member, it is preferable to comprise so that the level | step difference of the said duct piece may become substantially equal to the thickness dimension of the said plate-shaped member. . Further, it is preferable that a tapered surface portion is provided at an end portion of the step portion of the duct piece.
[0016]
Moreover, it is a structure which is good to comprise a part of plate-shaped member of the said duct piece with a material with higher heat resistance than other plate-shaped members.
[0017]
On the other hand, when laminating the plate-like members of the duct piece, the other than the longest of the plate-like members are laminated from the inside to the outside in the long order, and the longest one is placed on the outermost side of the duct piece. It is a good structure to stack so as to straddle the stepped portion .
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment in which the present invention is applied to a multiple cylindrical winding will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part same as a conventional structure (FIG.10 and FIG.11). That is, the multi-cylindrical winding 4 is formed by winding the conductor 1 in a cylindrical shape to form one conductor layer 2 and stacking a plurality of the conductor layers 2. Between the plurality of conductor layers 2, a sheet-like interlayer insulator 3 and a refrigerant flow path 5 through which a cooling medium for winding cooling flows are provided as necessary.
[0019]
FIG. 1 is a cross-sectional view of the multiple cylindrical winding 4 of this embodiment. As shown in FIG. 1, a coolant channel 5a is provided between the first conductor layer 2 and the second conductor layer 2, and the second conductor layer 2 and the third conductor layer 2 are provided. The refrigerant flow path 5b is provided between the two. In this case, the coolant channel 5a has a thickness such that the upper part (the part corresponding to the part where the potential difference between the conductor layers is large) is thick and the lower part (the part corresponding to the part where the potential difference between the conductor layers is small) is thin. The dimension (the dimension in the radial direction of the winding) is changed, for example, in three stages. Similarly, the coolant channel 5b has a thickness dimension such that the upper part (the part corresponding to the part where the potential difference between the layers is small) is thin and the lower part (the part corresponding to the part where the potential difference between the layers is large) is thin. Is changed to, for example, three stages.
[0020]
Here, FIG. 2 shows the relationship between the potential difference generated between the conductor layers 2 and the thickness dimension that the refrigerant channel 5 on insulation should have. In FIG. 2, an oblique straight line A indicates the minimum thickness dimension of the refrigerant flow path 5 required for insulation. A horizontal straight line B indicates the minimum thickness dimension of the refrigerant flow path 5 necessary for cooling. And the step-like line C has shown the change of the thickness dimension of the refrigerant | coolant flow path 5a of a present Example. From FIG. 2, the thickness dimension of the refrigerant flow path 5a of this embodiment is equal to or greater than the minimum thickness dimension of the refrigerant flow path 5 required for cooling, and the minimum thickness dimension of the refrigerant flow path 5 required for insulation. You can see that there are more.
[0021]
A rod-shaped duct piece 11 (see FIG. 3) is provided between the first conductor layer 2 and the second conductor layer 2 in order to secure a coolant channel 5a. It is arranged so as to extend along the axial direction of the winding. As for the said duct piece 11, the thickness dimension (dimension of the radial direction of a coil | winding) is changed in steps. Specifically, the thickness dimension of the duct piece 11 is changed, for example, in three stages so that the upper part of the duct piece 11 is thick and the lower part is thin.
[0022]
A specific configuration of the duct piece 11 is shown in FIG. As shown in FIG. 3, the duct piece 11 is configured by stacking, for example, original plates 12 which are plate-like members. In this case, two kinds of original plates 12a, 12b, and 12c having different sizes are stacked two by two. Here, the vertical dimension of the original plate 12a in FIG. 3 is set to be approximately equal to the vertical dimension of the duct piece 11. The vertical dimension of the original plate 12b is set to be approximately equal to the vertical dimension of the upper and middle convex parts of the duct piece 11 combined. The vertical dimension of the original plate 12 c is set to be approximately equal to the vertical dimension of the upper convex portion of the duct piece 11. In addition, what is necessary is just to use the same material as the original plate used for the duct piece of a conventional structure as the original plate 12.
[0023]
And the one piece piece 11 is manufactured by cut | disconnecting (cutting out) the lamination | stacking member which laminated | stacked two said 3 types of original plates 12a, 12b, 12c at a cutting line S3. In the case of this configuration, the step of the duct piece 11 is set to be equal to the thickness dimension of the two original plates 12. And many duct pieces 11 can be manufactured by cut | disconnecting the said laminated member similarly.
[0024]
In the present embodiment having such a configuration, the thickness dimension of the duct piece 11 is changed stepwise, specifically, changed in three steps. Thus, the stacking direction of the original plate 12 of the duct piece 11 is configured to be orthogonal to the potential difference direction between the conductor layers 2, and only the number of stacked original plates 12 is changed, and machining such as cutting is not required. Can do. Therefore, the withstand voltage performance of the duct piece 11 can be made sufficiently high, and unlike the prior art (see FIG. 14), it is possible to prevent a decrease in the yield of the material.
[0025]
In the above embodiment, the level difference of the duct piece 11 is set equal to the thickness dimension of the two original plates 12, but the present invention is not limited to this, and it is equal to one or three or more original plates 12. It may be set equal to the thickness dimension. In short, the number of original plates 12 may be appropriately determined according to the required step size of the duct piece 11 and the thickness of the original plate 12 to be used.
[0026]
Moreover, in the said Example, although comprised so that the thickness dimension of the duct piece 11 may be changed in three steps, it may replace with this and may be comprised so that it may change in two steps or four steps or more. Further, in the above embodiment, the duct piece 11 is arranged directly between the two conductor layers 2, that is, the conductor layer 2 is wound directly on the duct piece 11. In addition, a sheet-like insulator may be interposed between the duct piece 11 and the conductor layer 2.
[0027]
FIG. 4 shows a second embodiment of the present invention, and the differences from the first embodiment will be described. The same parts as those in the first embodiment are denoted by the same reference numerals. In the second embodiment, as shown in FIG. 4, the step of the duct piece 11 is set to be approximately equal to the standard plate thickness (thickness dimension) of the commercially available original plate 13 that is a plate-like member. According to this configuration, the duct piece 11 can be configured by stacking the number of original plates 13 equal to the number of steps of the duct piece 11, for example, three original plates 13a, 13b, and 13c. Therefore, the manufacturing process of the duct piece 11 is further simplified.
[0028]
FIG. 5 shows a third embodiment of the present invention, and different points from the second embodiment will be described. The same parts as those in the second embodiment are denoted by the same reference numerals. In a 3rd Example, as shown in FIG. 5, the taper surface part 14 is provided in this edge part by tapering the edge part of the level | step-difference part of the duct piece 11. As shown in FIG. According to this configuration, when the conductor 1 is wound on the duct piece 11, the winding proceeds smoothly even when the conductor 1 is wound around the step portion of the duct piece 11. For this reason, the conductor 1 can be wound uniformly, and it can prevent that the insulation coating of the conductor 1 is damaged at the corner | angular part of the level | step-difference part of the duct piece 11. FIG.
[0029]
FIG. 6 shows a fourth embodiment of the present invention, and the differences from the first embodiment will be described. The same parts as those in the first embodiment are denoted by the same reference numerals. In the fourth embodiment, as shown in FIG. 6, the original plate 15 adjacent to the outer conductor layer 2 of the original plate 12 of the duct piece 11 is disposed so as to straddle the step portion of the duct piece 11. .
[0030]
In the case of this configuration, the lowest step of the duct piece 11 is constituted by one original plate 12a, and two original plates 12b and 12c for the middle and upper steps are laminated thereon, and further, the lowest is provided thereon. One original plate 15 having a size slightly longer than the step original plate 12 a is laminated so as to straddle the step portion of the duct piece 11. By comprising in this way, the part 15a which straddles the level | step-difference part of the duct piece 11 among the original plates 15 of outermost layer becomes a substantially smooth slope part.
[0031]
According to the fourth embodiment described above, the winding can be performed smoothly when the conductor 1 is wound around the step portion of the duct piece 11 without providing the tapered surface portion 14 (third embodiment). Therefore, the conductor 1 can be wound uniformly, and the insulation coating of the conductor 1 can be prevented from being damaged at the corners of the stepped portion of the duct piece 11.
[0032]
FIG. 7 shows a fifth embodiment of the present invention, and the differences from the second embodiment will be described. The same parts as those in the second embodiment are denoted by the same reference numerals. In the fifth embodiment, as shown in FIG. 7, when the original plate 12 of the duct piece 11 is laminated, the original plate 12a, 12b, 12c other than the longest one, that is, the original plates 12b, 12c are long. The layers were laminated in order from the inside to the outside, and the longest of the original plates 12, that is, the original plate 12 a was laminated on the outermost side so as to straddle the step portion of the duct piece 11.
[0033]
Also in this configuration, the portion of the outermost original plate 12a that straddles the stepped portion of the duct piece 11 is a substantially smooth slope portion. Therefore, according to the fifth embodiment, even when the tapered surface portion 14 (third embodiment) is not provided, the winding is performed smoothly when the conductor 1 is wound around the step portion of the duct piece 11. be able to. For this reason, the conductor 1 can be wound uniformly, and it can prevent reliably that the insulation coating of the conductor 1 is damaged at the corner | angular part of the level | step-difference part of the duct piece 11. FIG. Furthermore, the number of original plates 12 required for configuring the duct piece 11 remains three and does not need to be changed.
[0034]
FIG. 8 shows a sixth embodiment of the present invention, and the differences from the second embodiment will be described. The same parts as those in the second embodiment are denoted by the same reference numerals. In the sixth embodiment, as shown in FIG. 8, a portion 16 of the original plate 12 of the duct piece 11 is made of a material having higher heat resistance than the other portions. Specifically, only the upper portion 16 (the portion indicated by the hatched area in FIG. 8) of the original plate 12 (12a, 12b, 12c) of the duct piece 11 is made of a material having high heat resistance (note that the original plate 12c) The whole was made of a material with high heat resistance). These upper portions 16 are portions corresponding to the upper portions of the windings where the temperature of the cooling medium increases.
[0035]
According to the sixth embodiment, the heat resistance of the duct piece 11 can be made sufficiently high, and the amount of a material having high heat resistance (that is, an expensive material) can be reduced as much as possible.
[0036]
FIG. 9 shows a seventh embodiment of the present invention, and the differences from the fourth embodiment will be described. The same parts as those in the fourth embodiment are denoted by the same reference numerals. In the seventh embodiment, as shown in FIG. 9, the innermost original plate 12a and the outermost original plate 15 among the original plates of the duct piece 11 are made of a material having high heat resistance. The original plate 12a and the original plate 15 are portions that come into contact with the conductor layer 2, that is, portions where the temperature increases. Therefore, in the seventh embodiment, substantially the same operational effects as in the sixth embodiment can be obtained.
[0037]
In each of the above embodiments, the present invention is applied to the multi-cylindrical winding 4. However, the present invention is not limited to this, and is applied to a multi-rectangular winding formed by winding each conductor layer in a substantially rectangular tube shape. May be.
[0038]
【The invention's effect】
As apparent from the above description, the present invention is configured so that the thickness dimension of the duct piece is changed stepwise, so that the stacking direction of the laminated members of the duct piece is configured to be orthogonal to the potential difference direction between the conductor layers. However, it is only necessary to change the number of laminated members, and it is possible to sufficiently increase the withstand voltage performance of the duct piece and to prevent a decrease in the yield of the material.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a multi-cylindrical winding showing a first embodiment of the present invention. FIG. 2 is a diagram showing the relationship between the thickness dimension of a refrigerant flow path and the height of a winding. FIG. 4 is a side view of a duct piece showing a second embodiment of the present invention. FIG. 5 is a side view of a duct piece showing a third embodiment of the present invention. FIG. 7 is a side view of a duct piece showing a fifth embodiment of the present invention. FIG. 8 is a side view of a duct piece showing the sixth embodiment of the present invention. FIG. 10 is a partially cutaway perspective view of a multi-cylindrical winding showing a conventional configuration. FIG. 11 is a cross-sectional view of the multi-cylindrical winding. FIG. 13 is a perspective view showing an example of a duct piece manufacturing method. FIG. 14 is a perspective view showing another example of a duct piece manufacturing method. DESCRIPTION OF SYMBOLS
1 is a conductor, 2 is a conductor layer, 3 is an interlayer insulator, 4 is a multi-cylindrical winding (winding for static induction equipment), 5 is a refrigerant flow path, 7 is a crossover, 11 is a duct piece, 12 is an original plate, Reference numeral 13 denotes an original plate, 14 denotes a tapered surface portion, and 15 denotes an original plate.

Claims (6)

A multi-cylinder winding configured by winding a conductor in a cylindrical shape so as to overlap a plurality of layers, and provided with a refrigerant flow path for flowing a winding cooling refrigerant between the conductor layers. The thickness dimension of the part corresponding to the part where the voltage difference generated between the conductor layers is large is increased, and the thickness dimension of the part corresponding to the part where the voltage difference generated between the conductor layers in the refrigerant flow path is small is configured. In windings for static induction equipment,
A rod-shaped duct piece for securing the refrigerant flow path between the conductor layers is disposed so as to extend along the axial direction between the conductor layers, and
It is configured to change the thickness dimension of the duct piece in stages ,
The duct piece is configured by laminating plate members, and
A winding for stationary induction equipment , wherein a plate-like member adjacent to an outer conductor layer among the plate-like members of the duct piece is disposed so as to straddle the stepped portion of the duct piece . The duct piece is configured by stacking commercially available plate-like members,
The winding for static induction equipment according to claim 1, wherein the step of the duct piece is configured to be substantially equal to a thickness dimension of the plate-like member. 3. The winding for stationary induction equipment according to claim 1, wherein a part of the plate-like member of the duct piece is made of a material having higher heat resistance than other plate-like members . A multi-cylinder winding configured by winding a conductor in a cylindrical shape so as to overlap a plurality of layers, and provided with a refrigerant flow path for flowing a winding cooling refrigerant between the conductor layers. The thickness dimension of the part corresponding to the part where the voltage difference generated between the conductor layers is large is increased, and the thickness dimension of the part corresponding to the part where the voltage difference generated between the conductor layers in the refrigerant flow path is small is configured. In windings for static induction equipment,
A rod-shaped duct piece for securing the refrigerant flow path between the conductor layers is disposed so as to extend along the axial direction between the conductor layers, and
It is configured to change the thickness dimension of the duct piece in stages,
The duct piece is configured by laminating plate members, and
When laminating the plate-like members of the duct piece, those other than the longest of the plate-like members are laminated from the inside to the outside in the long order, and the longest one is the outermost step portion of the duct piece A winding for static induction equipment , characterized by being laminated so as to straddle the wire. The duct piece is configured by stacking commercially available plate-like members,
The winding for a stationary induction device according to claim 4, wherein the step of the duct piece is configured to be substantially equal to the thickness dimension of the plate-like member . A portion of the plate-like member before Symbol duct piece according to claim 4 or 5 stationary induction apparatus for winding wire according to, characterized in that it is composed of a material having high heat resistance than the other plate-like member .

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