JPH05159943A - Winding for stationary induction device - Google Patents

Abstract

PURPOSE:To attain a high space factor of a winding by inserting a high elasticity plastic spacer molded in a shape substantially matching to a strand shape between an innermost side strand and its adjacent strand and winding it. CONSTITUTION:Conductors 1 having strand insulators 2 are so wound as to be applied by a potential in a described order in the strand conductors 1 radially in a disc state through rails 4 aligned at equal intervals on a foundation insulating cylinder 3, and spacers 5 so having designated thickness as to be engaged with the rail 4 are aligned between sections in a circumferential direction to form the sections. In this case, a spacer 6 molded of elastomer is inserted between an innermost side strand and a second strand and wound. Thus, excellent insulating characteristics and a high space factor are performed in a winding structure of a high voltage transformer, and a structure having an inexpensive using material and excellent operability can be obtained.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to windings of high voltage quiescent induction machines.

[0002]

2. Description of the Related Art When deciding the winding structure of a high-voltage induction electric generator, for example, a transformer, the first consideration is that the potential distribution of the winding is uniform over the entire length against the intrusion of lightning surge from the system and the winding occupancy is uniform. It has a high product factor (ratio of the current-carrying conductor to the cross section of the winding), and it has good workability. Hi-cell cap windings have been widely used as one of winding structures satisfying such requirements. As shown in FIG. 12, this winding has a structure in which conductors of an electrically separated potential are arranged between the adjacent conductors C ₁ and C _{2, and} there has been no method of improving the potential distribution by devising the winding method. Many have been proposed. However, due to the structure of this high cell cap winding, a potential difference of about three times the number of turns per section occurs between the adjacent sections S ₁ and S _2, and in the case of FIG. 12, the second section corresponding to this section. Since the electric field is concentrated at the end of the innermost strand of S ₂ , it becomes the weakest point, which is a constraint for increasing the voltage. The state of concentration of electric field strength in this portion is shown by an example of electric field analysis in FIG.
It can be seen in Fig. 13 that the most electric field concentrated portion is a superposition of the electric field in the main gap direction with the low-voltage winding and the electric field in the section direction. On the other hand, by devising the winding method as shown in Fig. 14, the position where the highest voltage is applied between the sections is set to the second turn from the inside of the innermost wire, so that the innermost wire with the highest electric field concentration The electric field can be relaxed and the breakdown voltage can be improved accordingly. According to our research results, in the case of oil- ^immersed transformer, the electric field strength of the inner wire of the main gap in the high cell cap winding is E ₁ = K ₁ r ^-0.21 It has been experimentally determined that the breakdown is determined by the equation expressed by 1 equation (r is the insulation radius of the wire, K ₁ is a constant), and the electric field relaxation of the innermost wire due to the above structure modification improves the dielectric strength. It has been proved that there is an effect on. However, when attempting to design a high voltage transformer in which the insulation dimensions are cut down, for example, the main gap insulation is generally a barrier insulation structure. Dimension d and breakdown electric field strength E
_There is a relationship of approximately E ₂ = K ₂ · d ^-1/3 ( ₂ ) (K ₂ is a constant) between ₂ and _2, and if the gap dimension d is made smaller, the allowable electric field strength increases and the main gap as a whole. A barrier subdivision structure is used by taking advantage of the possibility of reducing the size. In this case, the electric field at the end of the innermost strand naturally rises, but when the high cell cap winding structure is adopted as described above, the breakdown is determined by the electric field determined by the radius of the innermost strand insulation surface. Therefore, there is a limit to the reduction. As a means to avoid this,
As shown in FIG. 15, it has been devised to apply an L-shaped insulator 11 to the end of the innermost wire section where the electric field is concentrated.
In this case, the breakdown electric field strength determined by the above equation (1) becomes larger as the insulator becomes thicker and consequently becomes smaller, but the electric field on the surface of the insulator is further relaxed and the dielectric strength is improved. However, in this case, since the section heights of the portion into which the L-shaped insulator 11 is inserted and other general portions are different, it is necessary to cut out a part of the spacer forming the oil passage, which increases the price due to the labor. Bring Also,
When the L-shaped insulator 11 is made of crepe paper or a pressboard molded product, there is nothing to constrain the shape other than the part fixed by the spacer and rail, so the L-shaped angle can be fixed at 90 degrees. Instead, the angle is widened, the oil passage is narrowed, and the cooling characteristics of the winding are adversely affected. To prevent this, L-shaped insulator 11
Is tied with a tape or the like so as to be integrated with the strand corresponding to the width, but in this case, there is a drawback that it takes a lot of time to process it. Another measure for improving the withstand voltage is the electric field distribution due to the difference in the dielectric constant between the oil and the solid insulator material that constitutes the spacer due to the wedge-shaped oil gap formed between the wire contact and the spacer in contact with the dielectric breakdown at the end of the wire. Since it becomes discontinuous at the boundary surface, it occurs along the interface, and in order to reduce the discontinuity at the boundary and reduce the discontinuity at the boundary, a general kraft pulp-based spacer is used instead. It has also been proposed to use a low dielectric constant spacer made by mixing kraft pulp with a synthetic material having a dielectric constant smaller than that of pulp (for example, polymethylpentene). However, in this case, the price of the low dielectric constant pressboard increases significantly, and the compression characteristics of the pressboard are generally better than those of general kraft pulp pressboards, and the amount of displacement due to the electromagnetic mechanical force applied to the winding is great. However, there is a drawback that a problem arises when manufacturing a large capacity transformer.

As mentioned above, there is another method of subdividing the oil passage in the main gap as another measure for improving the pressure resistance. However, when the dimension of the oil passage in the axial direction adjacent to the winding is set to a certain value or less, the oil passage is cooled for cooling. The resistance to oil flow increases, which leads to a decrease in circulating oil amount and an increase in winding temperature increase. Therefore, for the portion where the oil passage adjacent to the winding is made smaller, it is necessary to secure an axial oil passage by inserting a spacing piece between turns at appropriate positions on the inner diameter side in the winding section. There is a problem that the number of winding steps for this mounting is significantly increased while the cost for manufacturing the spacing piece is reduced.

[0004]

As described above, when considering a high voltage winding, for example, a UHV transformer winding to be planned in the future, it is desirable to have a winding that withstands the voltage and has a space factor as high as possible. .. In order to achieve this, the potential distribution in the winding against the intrusion lightning surge is improved to reduce the voltage shared by the section near the line end, and at the same time the electric field strength applied locally is reduced by devising the winding structure. It is necessary to improve the breakdown electric field strength by using an appropriate structure. Needless to say, in order to achieve the same purpose, workability should be as good as possible and characteristics other than insulation, for example, characteristics such as electromagnetic mechanical force and cooling, should not be adversely affected. However, in the conventional structure, even if the structure shown in FIGS. 14 and 15 is adopted and the low dielectric constant spacer is adopted, the electric field concentrated at the end of the wire cannot be sufficiently relaxed, and the oil gap breakdown due to the main gap barrier subdivision Despite the improvement of the electric field strength, there is a disadvantage that the main gap size is limited by the electric field at the end of the wire.
There were also many problems in workability and price.

An object of the present invention is to provide a winding structure for a high-voltage transformer, which has excellent insulation characteristics and achieves a high space factor, and is inexpensive in use materials and excellent in workability. Especially.

[0006]

The first object of the invention is to achieve the purpose of alleviating the electric field on the inner circumference side of the winding near the winding end, which is the weak point of the winding, where the electric field strength is most concentrated. In the high cell cap winding in which the wire that produces the maximum potential difference between the sections is placed second from the inside, it was formed into a shape that was almost the same as the wire between the innermost wire and the second wire from the inside. High elasticity plastic (hereinafter called elastomer)
It is characterized in that a space piece is inserted and wound.

According to the second aspect of the invention, although the electric field strength applied to the end portions of the strands is reduced by the above-mentioned invention, when aiming for a more compact design, the end portions of the innermost strands still become weak points, so the weak points are eliminated. It is devised to do so, and is characterized in that the innermost wire of the innermost wire is wound by applying an elastomer electric field relaxation filling material in the form of being in close contact with the wire.

A third aspect of the invention is that the spacing piece used in the first invention has the same shape as the electric field relaxation filling used in the second invention, and two flat surfaces are used so that they are stacked back to back. It is characterized by.

In a fourth aspect of the invention, a 0.1 to 1 mm thick elastomer is placed on the surface in contact with the section conductor as a spacer used to form an oil passage between sections of a winding, and the other general spacer is compressed. It is characterized by being made of an insulator with excellent characteristics, and the wedge-shaped oil gap formed between the adjacent strands in the section which becomes the weakness of winding insulation next to the end of the innermost strand and the spacer is made of elastomer. The purpose is to improve the dielectric strength by filling in the deformation due to the winding tightening force.

The fifth aspect of the present invention relates to a main gap structure between high and low voltage windings, which is another element for determining insulation of windings, and a line end is disposed at the center of the winding and a winding consisting of two upper and lower circuits. In the wire, a disk winding characterized in that the rails that are in contact with the winding and arranged at equal intervals on the basic insulating cylinder are thin at the winding center and thick at the winding end. By changing the size of the oil passage adjacent to the winding according to the electric field applied to the gap, the structure is configured to withstand higher pressure.

A sixth aspect of the invention is characterized in that in the above invention, the material is a plastic material having a relative dielectric constant of 3.5 or less. By lowering the dielectric constant as compared with a commonly used pressboard product, , A stable structure is obtained by suppressing the variation of the dielectric breakdown due to the difference in the dielectric constant at the boundary surface between the rail and the oil passage.

The above description is mainly made with oil insulation in mind. However, even if SF ₆ gas or fluorocarbon is used instead of oil, the wire insulation is made plastic (for example, PE).
By setting T or PPS, almost the same effect can be expected.

[0013]

In this way, if the method of increasing only the insulation dimension between the innermost turns is adopted, the decrease in series capacitance is slight, and the average electric field strength between turns decreases almost in inverse proportion to the increase in dimension. , The maximum electric field strength at the edges decreases. Therefore, it is possible to increase the average electric field strength in the main gap direction within a range in which the electric field strength at the end of the wire is kept below an allowable fixed value, in other words, it is possible to further reduce the size of the main gap.
In this case, by adopting an elastomer as the insulator to be inserted, it is possible to easily change the shape and continuously extrude into a shape that closely adheres to the wires of various sizes, and obtain an insulator with a special shape at a relatively low cost. It is possible to
Further, since it is flexible, it has good workability when attached to the winding wire and can be closely attached to the wire conductor.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a part of a line end portion of a high cell cap disk winding according to the present invention. The conductors 1 with the wire insulation 1 are arranged on the basic insulation cylinder 3 via the rails 4 arranged at equal intervals, and the potentials are formed in a disk shape in the radial direction on the conductors in the order in which they are written in the wire conductor 1. The sections are arranged in the circumferential direction such that the spacers 5 are wound so as to be provided and the rails 4 are fitted between the sections in a specified thickness. At this time, the spacing piece 6 made of an elastomer is inserted between the innermost wire and the second wire and wound up.

In the example of the electric field analysis in the conventional structure shown in FIG. 14, the most electric field concentrated portion is the innermost wire end portion, and as a result of investigating this value by changing the main gap size, the section size, and the turn size, the maximum It was found that the electric field strength can be approximated by the following formula: A × average electric field in main gap direction + B × average electric field between turns (3) (A and B are constants). As has been seen previously, it has been experimentally determined that the breakdown electric field strength at this portion is expressed by one equation, and when the dimensions of the conductor 1 and the thickness of the wire insulation 2 are determined, the breakdown electric field is almost uniquely determined. It will be decided. Therefore, the average electric field in the main gap direction rises when the main gap size is shortened aiming at a more compact design. Therefore, it is necessary to lower the inter-turn average electric field strength in order to keep the maximum electric field strength at the end of the wire constant. is there. As a method for this, there are a method of further improving the potential distribution characteristic of the Haselcap winding against lightning surges to reduce the shared voltage applied between turns and a method of increasing the dimension between turns. Regarding the former, by increasing the thickness of the wire insulation 2 as a whole in the latter, the series capacitance between turns decreases when viewed from the equivalent circuit of the winding against lightning surge intrusion. Therefore, the shared voltage applied to the wire does not contribute to the reduction of the electric field strength between turns due to the increase in the thickness of the wire insulation. However, if the method of increasing only the insulation dimension between the innermost turns as in the present invention is adopted, the degree of decrease in series capacitance is slight and the average electric field strength between turns decreases in inverse proportion to the increase in dimension. The maximum electric field strength decreases. Therefore, it is possible to increase the average electric field strength in the main gap direction within a range in which the electric field strength at the end of the wire is kept below an allowable fixed value, in other words, it is possible to further reduce the size of the main gap. In this case, by adopting an elastomer as the insulator to be inserted, it is possible to easily change the shape and continuously extrude into a shape that closely adheres to the wires of various sizes, and obtain an insulator with a special shape at a relatively low cost. It is possible to Further, since it is flexible, it has good workability when attached to the winding wire and can be closely attached to the wire conductor.

Next, an embodiment of the second invention will be described with reference to the drawings. FIG. 2 is a schematic cross-sectional view showing a part of the line end of the disk-shaped winding according to the present invention. The conductor 1 having the wire insulation 2 is provided on the basic insulation cylinder 3 via the rails 4 arranged at equal intervals, and is formed in a disk shape in the radial direction on the next section from the outer diameter side to the inner diameter side. Then, in order from the inner diameter side to the outer diameter side, the spacers 5 of the specified thickness are circumferentially arranged so as to be fitted to the rails 4 between the winding sections to form sections. At this time, when the innermost wire is wound around the rail 4, the electric field relaxation filling 7 formed of an elastomer is wound around the inner circumference of the wire while closely contacting the wire.

As shown in the electric field analysis example of FIG. 13, the most electric field concentrated portion in the winding is the innermost wire end portion, and the dielectric breakdown is a wedge shape formed between the spacer 5 and the conductor wire insulation 2. The electric field distribution at the interface of the spacer 5 in the gap becomes discontinuous as shown in Fig. 16 due to the difference in the relative permittivity of the gap space and the spacer, and this value occurs when it exceeds the limit value. Has been found to be significantly lower than the breakdown electric field strength when there is only a gap space. Therefore, by filling this weak point with the elastomer 7 whose dielectric strength is higher than that of the gap constituent material (insulating oil) and whose relative dielectric constant is relatively close to that of the spacer constituent material, the wedge gap is eliminated, and the dielectric strength from the conductor 1 is eliminated. Since the weakest oil gap portion is moved away from the target, the maximum electric field strength applied to the oil gap is also weakened, so that the low pressure can be improved.

Since the breakdown voltage can be improved as described above, the size of the main gap insulation or the size of the section can be reduced, and a compact winding with a high space factor can be provided. Also, since it is a one-piece molded product made of elastomer, it has flexibility and sufficient shape retention force, so it is easy to attach it to the winding wire. Also, since there is no protrusion from the conductor surface, there is no oil like the conventional L-shaped angle. It does not interfere with the flow and does not need to be processed with a notch in the spacer, so it has excellent cooling performance and workability.

FIG. 3 shows a partial sectional view of the winding when the first invention and the second invention are used together. In this case, the effect is superposed and the end portion of the innermost conductor 1 is inserted by inserting the spacing piece 6. The electric field is alleviated, and further, the insertion of the electric field alleviation padding 7 eliminates the wedge oil gap, which is the weakest point, and at the same time, the oil gap having the lowest dielectric strength is moved away from the conductor, thereby providing a more compact transformer. Is possible. Further, in this case, it is possible to use the same two pieces of the electric field relaxation filling material 7 as the spacing pieces 6 with their flat surfaces aligned. Figure 4
Shows the installation status. In this way, if an elastomer is used as the material, it is possible to continuously produce a long electric field relaxation filling material 7 having a cross-sectional shape by making one type of extrusion molding die, and cut it to the required length. Therefore, it is possible to easily cope with this, and it is possible to improve the withstand voltage of the winding and to make it compact at a very low cost. The bending radius of the end face of the wire conductor 1 is standardized, and the thickness of the wire insulation 2 is a fixed value because the applied voltage class is limited to UHV or 500 kV. Can be limited to about 1 to 3 types. Also, in the width direction, it is sufficient that there are 5 to 6 types corresponding to the width of the conductor 1, so that the filling 7 can be manufactured at a relatively low cost.

In the fourth aspect of the invention, instead of the spacer 5 constituting the section in FIG. 1, an elastomer having the same shape as that of the spacer 5 on both surfaces and having a relative dielectric constant of 3.5 or less having a thickness of 0.1 to 1 mm is used. It is characterized by being arranged and configured. The structure is shown in FIGS.

The winding receives a large electromagnetic mechanical force during operation due to a ground fault in the system or the like. In order to withstand this force, a sufficient compressive axial compression force should be applied to the windings when the transformer is manufactured. At the same time, the spacer 5 used as a material for the spacer 5 acts as a kind of spring when electromagnetic mechanical force acts. Therefore, it is common for large capacity devices to use a material having as high rigidity as possible. Elastomer spacer 8 of the present invention
Is arranged in contact with the winding section conductor 1, the elastomer spacer 8 is easily deformed by the winding tightening force at the time of manufacture, and the wedge-shaped gap between the strands is filled as shown in FIG. Therefore, as the thickness of the elastomer, it may be changed to some extent depending on the easiness of deformation, but it is sufficient to select a thickness enough to fill the wedge-shaped gap formed in the conductor by a specified pressure. The elastomer 8 thus compressed and deformed is sandwiched between the conductor 1 and the spacer 5, and there is no room for volume change with respect to an electromagnetic mechanical force that acts instantaneously. The value is close to the rigidity of the material of the spacer 5 used for the entire section, and it is possible to maintain sufficiently high reliability against electromagnetic mechanical force.

When the insulation strength of the end of the innermost wire, which is the weakest point in terms of insulation in inter-section insulation, is enhanced by the first and second inventions, the next weakest point is the turn of the high cell cap winding. It is destruction at the interface of the spacer 5 in the turn wedge-shaped gap portion due to the inter-field strength. This phenomenon is the same as the above-mentioned end portion. On the other hand, according to the structure of the present invention, as shown in FIG. 7, the wedge-shaped gap between the wires is substantially filled with the elastomer having a higher dielectric strength than oil. Therefore, for inter-section insulation, it is possible to improve the proof strength to a value that is almost determined by the breakdown in the wedge-shaped gap between strands in the general area without spacers. Can be realized.

This elastomer is thin and easily deformed at the time of working, and it is troublesome and time-consuming to attach it at the time of winding work. Therefore, the workability can be improved by preliminarily adhering the elastomer to the spacer 5 or integrating the same with the spacer 5 in the state of the spacer alone or the material before the spacer is cut into the shape as shown in FIG. Is possible.

A sixth embodiment of the invention will be described with reference to the drawings. FIG. 8 shows a cross-sectional view of the disk-shaped winding according to the present invention. A rail 9 having a thin central portion and thick ends is arranged on the insulating cylinder 3 at equal intervals, and a disk-shaped winding is wound on the rail 9. 9 and 10 show side views of the stepped rail. Since the thin part of the center rail is small as an oil passage for cooling and it is not possible to flow the amount of oil required for cooling, the intermediate oil passage spacing piece 10 is used to pass oil axially between the sections. Entrained to form an oil passage.

The size of the main gap insulation between the high and low voltage windings is determined by the allowable electric field determined by the oil passage size between the barriers of the barrier insulation that constitutes the main gap except for the line end innermost strand end insulation. It Since this allowable electric field and the size of the oil passage satisfy the two equations, the allowable electric field strength is increased by reducing the oil passage between the barriers, and the main gap size can be shortened. However, looking at the winding as a whole, the center of the winding, which is the end of the line electrically, is the highest, and the potential becomes lower as it approaches the neutral point end (the end of the medium voltage line in the case of an autotransformer). .. In this way, when viewed along the entire length of the winding, the electric field intensity applied to the main gap is not uniform and the line end is high and the neutral point end is low. Therefore, the electric field strength decreases as the distance from the line end increases, so that the oil passage size determined by the allowable electric field strength may be increased as the position approaches the neutral point end. Therefore, in the range where the electric field strength is allowed, using the rail inside the winding, which is the standard structure of general transformers, as the oil passage in the winding direction has a merit of suppressing the price increase rather than providing an intermediate oil passage in the winding. .. As described above, in the part where the electric field strength of the main gap is high, even if the workability of the winding is sacrificed to some extent, the main gap oil passage adjacent to the winding is made smaller and the allowable breakdown electric field strength is increased to transform Although the cost merit will be greater if the equipment is made more compact, the physical structure of the winding will be affected by pursuing the workability of the winding as a standard structure in the part where the need for electric field strength is eliminated. Therefore, the price can be reduced.

FIG. 11 shows another embodiment. In FIG. 8, the electric potential of the winding changes almost continuously over the entire length of the winding in order to align the axial intermediate oil passage positions in the radial direction, but at a position where the electric field strength does not cause a problem structurally. The oil passage structure is changed to. However, considering the change in the total length of the winding and the rail thickness, when considering a large-capacity transformer, the change in thickness is about 6 to 8 mm for a length of about 2 m. The effect on the cooling surface due to the radial change of the oil passage position can be ignored. Rather, since the potential changes continuously over the entire length, continuously changing the oil passage size also changes the allowable electric field strength of the oil passage continuously, which is called continuity of tolerance over the entire winding length. It is also preferable from the point of view. Furthermore, in a large-capacity device, an axial force acts due to the electromagnetic mechanical force applied to the winding wire during operation.
It is more preferable that the method has continuity in terms of supporting the winding.

Press board material is generally used as the rail material, but the relative permittivity of the press board is as high as about 4.5 compared to 2.2 for oil, and in the case of a barrier insulation structure, the oil gap is electrically parallel to the press board rail. Although it is a structure, it has been experimentally confirmed that, in terms of insulation, the interface is often a weak point and the average dielectric strength and the variation in withstand voltage are inferior to those without rails. Since it is difficult to omit the rail because of its structure, it is preferable to minimize the influence when the rail is inserted. For such a purpose, FIG.
Alternatively, by using a plastic whose relative dielectric constant is closer to oil than that of the press board for the rail 9 in FIG. 11, it is possible to provide a stable transformer having a higher dielectric strength.

The above description has been made mainly for oil-filled transformers, but the effect is not diminished even in gas-insulated or fluorocarbon-insulated transformers which have recently been put into practical use, and particularly in the case of gas-insulated transformers. Because of the characteristics, the dielectric breakdown is more dependent on the electric field strength than the oil, so that the effects are promoted in Inventions 1.2 and 4. In this case, needless to say, it is better to use plastic as the wire insulation in place of the kraft paper used in the oil-filled transformer because of its better dielectric strength.

[0030]

As described above, according to the present invention, the maximum potential difference wire added between the sections constituting the adjacent disk-shaped windings is arranged at the second turn from the inner diameter side of the winding. In the cell cap winding, a high-elasticity plastic spacing piece formed in a shape that almost matches the shape of the wire is inserted between the innermost wire and its adjacent wire, so that the wire is wound and the insulation characteristics are excellent. In addition, it is possible to obtain a winding wire of a static induction machine which achieves a high space factor of the winding wire, does not require expensive materials, and is excellent in workability.

[Brief description of drawings]

FIG. 1 is a sectional view showing a part of a line end of a winding of a static induction electric device according to the present invention.

FIG. 2 is a sectional view of a part of a line end portion of a winding showing another embodiment.

FIG. 3 is a sectional view of a part of a line end of a winding showing another embodiment.

FIG. 4 is a partial cross-sectional view showing a state in which an electric field relaxation filling material and a spacing piece are attached to the innermost wire in FIG.

FIG. 5 is a plan view of a winding spacer of the present invention.

FIG. 6 is a side view of FIG.

FIG. 7 is an enlarged cross-sectional view showing a situation where a spacer is attached to a winding.

FIG. 8 is a winding cross-sectional view showing how the rail according to the present invention is attached.

FIG. 9 is a side view of the rail.

FIG. 10 is a sectional side view of the rail.

FIG. 11 is a side view showing another embodiment of the rail.

FIG. 12 is a conceptual sectional view showing how to wind a high cell cap winding.

FIG. 13 is an electric field analysis example showing a state of electric field concentration at a winding line end portion when a lightning impulse voltage is applied to the high cell cap winding.

FIG. 14 is a conceptual sectional view showing another example of how to wind a high cell cap winding.

FIG. 15 is a partial cross-sectional view of a winding of a conventional method for relaxing electric field concentration on a wire at the end of a winding wire.

FIG. 16 is an electric field analysis example showing a situation in which an electric field is discontinuous due to a spacer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Conductor, 2 ... Elemental insulation, 3 ... Basic insulation cylinder, 4 ... Rail, 5 ... Spacer, 6 ... Spacing piece, 7 ... Electric field relaxation packing, 8
… High-elasticity plastic spacers, 9… Stepped rails, 10
… Filling for intermediate oilways, 11… L type insulation

Claims (7)

[Claims] 1. A high cell cap winding in which a maximum potential difference wire applied between the sections constituting adjacent disk-shaped windings is arranged at the second turn from the inner diameter side of the winding, and the innermost wire is provided. A winding of a static induction electric device, characterized in that a high-elasticity plastic spacing piece formed into a shape substantially conforming to the shape of a wire is inserted and wound between the adjacent wire and the adjacent wire. 2. A section constituting a disk-shaped winding, which is in close contact with the inner diameter side of the innermost strand of the wire, has one side flat and one side conforming to the shape of the strand, and the width is the upper insulation width of the strand. A winding of a static induction electric device, characterized in that it is wound by applying a high-elasticity plastic electric field relaxation filling material having substantially the same size and an appropriate thickness. 3. The winding of a static induction electric machine according to claim 1, wherein a flat member having the same shape as that of the padding used in claim 2 is used as a backing piece to be inserted therebetween. .. 4. A high elasticity plastic having a thickness of 0.1 to 1 mm is arranged on a surface in contact with the winding section in spacers arranged at equal intervals in a circumferential direction between the sections to form a disk-shaped winding, Remaining thickness is a winding of a static induction machine characterized by being made of an insulator with excellent compression characteristics. 5. A disk-shaped winding having a line end arranged at the center of the winding height and comprising two upper and lower circuits, and winding the thickness of rails arranged at equal intervals on a winding basic insulating cylinder. A winding of a static induction electric device, characterized in that the central part of the wire is thin and the end part of the wire is thick, and the winding is wound on it. 6. The relative permittivity of the rail material according to claim 5 is 3.
Winding of a static induction machine using plastic material of 5 or less. 7. The winding of an SF ₆ gas-filled or perfluorocarbon-filled static induction electric device according to claim 1, wherein a plastic film is used as the wire insulation.