JP2002118021A - Stationary induction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stationary induction apparatus, which can be improved in winding space factor, where the apparatus is equipped with a winding formed of a cable which is structurally advantageous for insulation and is environmentally superior in terms of environment. SOLUTION: A semiconductive layer is provided to the outer circumference of a conductor, a solid insulator is provided to the circumference of the semiconductor layer, and a semiconductive layer is provided to the outer circumference of the solid insulator for the formation of a cable 24. The cable 24 is used for a winding 22. By varying the thickness of the solid insulator of the cable 24 and/or the diameter of the conductor of the cable 24 at a halfway point of the winding 22, the thickness of the solid insulator of the cable 24 end/or the diameter of the conductor of the cable 24 are increased only at necessary parts and decreased at other parts, by which the excess thickness of the solid insulator or the excess diameter of the conductor can be eliminated, and the winding 22 can be improved in space factor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stationary induction device such as a transformer and a reactor for industrial and electric power.

[0002]

2. Description of the Related Art Conventionally, industrial and electric stationary induction devices have a power range of several kVA to 1200 MVA, and a voltage range of 1 kV to 1000 kV or a very high conversion voltage or more. . In this industrial and power static induction device, for example, in a transformer, an iron core is provided with several windings usually called primary windings, secondary windings, and control windings. ,
The windings are often arranged concentrically.

In a conventional power transformer shown in FIG. 18, a primary winding 2 and a secondary winding 3 are concentrically wound around a leg 1a of an iron core 1, and a space is provided between the windings. A bar 4 is provided. Among these, the iron core 1 is configured by laminating silicon steel plates, and cables are used for the primary winding 2 and the secondary winding 3. The space bar 4 is provided for providing a space between the windings for cooling.

[0004] In such a transformer, additional loss occurs due to the magnetic flux leaking from the iron core interlinking the conductor in each cable of the winding. Especially in industrial and power transformers with a high power range, in order to keep such losses as small as possible, each winding cable must be:
2. Description of the Related Art An MTC cable is used in which a large number of insulated wires are connected in parallel to form a stranded wire. This MTC cable (stranded wire) performs a transition that periodically changes its position so that the voltage induced in each wire is as equal as possible, and minimizes the voltage difference generated between the wires, thereby reducing the internal circulating current. The component is reduced.

[0005] Insulation performed inside the windings, between the windings, and between other metal members is performed in each direction, and an insulation design based on solid cellulose or varnish is made. . On the outside, solid cellulose, liquid and, if possible, gaseous insulators are arranged.

On the other hand, a cable 11 shown in FIG.
There is known a dry type transformer winding using the same. This is described in Japanese Unexamined Patent Publication No. Hei 11-514151, in which not only insulation between adjacent cables but also insulation between windings and ground insulation are performed by covering the strands, thereby achieving the above-described insulation. There is no need to use such composite insulation, and there is an advantage that the configuration is simplified. This cable 11 is, in detail, a conductor 1
2 has a semiconductive layer 13 on the outer periphery thereof, a solid insulator 14 on the outer periphery of the semiconductive layer 13, and a semiconductive layer 15 on the outer periphery of the solid insulator 14.
Is wound around an iron core as a winding to constitute a transformer.

According to Japanese Patent Publication No. 11-514151, the cable 11 has a conductor area of 30 to 300 mm ^{2 and} an outer diameter of 20 to 250 mm. The solid insulator 14 includes an improved crosslinked thermoplastic cable such as XLPE (crosslinked polyethylene),
Alternatively, an insulator of ethylene propylene (EP) rubber or another rubber such as silicon has been used.

The resistivity ρ of the inner semiconductive layer 13 is 10 ⁻⁶ Ωcm at the minimum value ρmin and 100 k at the maximum value ρmax.
The resistance R of the inner semiconductive layer 13 per unit length in the axial direction of the cable 11 is 50 μΩ / m at the minimum value Rmin and 5 MΩ / m at the maximum value Rmax.
Range.

The resistivity ρ of the outer semiconductive layer 15 is in the range of 1 Ωcm at the minimum value ρmin and 100 Ωcm at the maximum value ρmax. Furthermore, the resistance R of the outer semiconductive layer 15 per unit length in the axial direction of the cable 11 is a minimum value R
The range is 50Ω / m at min and the maximum value Rmax is 50MΩ / m. The thickness of the outer semiconductive layer 15 is 0.5
１1 mm. These semiconductive layers 13 and 15 have a function of reducing the surface electric field of the conductor 12.

In recent years, there has been an increasing demand for a transformer using such a cable 11 as a winding to reduce the load on the environment, and a transformer that does not use insulating oil or SF ₆ gas used in a conventional transformer has been used. Attention has come to be paid for by being asked. Further, the transformer using the cable 11 mainly uses a polymer insulator for the solid insulator 14 of the cable 11 and kneads conductive particles such as polymer insulator carbon for the semiconductive layers 13 and 15. Since it is used, it can be recycled together with copper as a material of the conductor 12, which also leads to a reduction in environmental load.

[0011]

However, in the above-described transformer using the cable 11 as a winding, the adjacent cables 1 and 2 are connected by the solid insulator 14 of the cable 11.
1 as well as the insulation between the windings and the ground, the thickness of the solid insulator 14 is determined at the point where the insulation strength is most required. And the space factor of the winding became worse.

The present invention has been made in view of the above-mentioned circumstances, and accordingly, has as its object an advantage over the above-described insulating structure.
It is an object of the present invention to provide a stationary induction device which can improve a space factor of a winding mainly in a cable using an environmentally superior cable for the winding.

[0013]

In order to achieve the above object, a stationary induction device according to the present invention has, firstly, a semiconductive layer on the outer periphery of a conductor, and a solid insulating layer on the outer periphery of the semiconductive layer. A cable having a semiconductive layer on the outer periphery of the solid insulator for winding, the thickness of the solid insulator of the cable and / or the diameter of the conductor, or both of them, It is characterized in that it has been changed on the way (the invention of claim 1). According to this, the thickness of the solid insulation of the cable and / or the diameter of the conductor are increased only in the necessary parts and reduced in the other parts, so that their excessive thickness and diameter are reduced. Therefore, the space factor of the winding can be improved.

In this case, it is preferable that the thickness of the solid insulator of the cable be changed by changing the outer diameter of the continuous solid insulator. In this case, the thickness of the solid insulator of the cable can be easily changed during the manufacturing process of the cable.

The thickness of the solid insulator of the cable, the diameter of the conductor, or both of them may be changed by connecting those different and separate cables (the invention of claim 3). In this case, the thickness of the solid insulator of the cable and / or the diameter of the conductor can be easily changed in the operation of connecting the cable.

Further, in this case, it is preferable that the connection portion to which the separate cable is connected is arranged at a position where the winding is not wound (the invention of claim 4). In this configuration, it is possible to prevent the space factor of the winding from being deteriorated at the connection portion where the separate cables are connected. Further, it is preferable that a partial discharge detecting section is provided at the connection section (the invention of claim 5). In this case, it is possible to effectively detect a partial discharge that is likely to occur due to electric field concentration at the end of the winding.

Second, the stationary induction device of the present invention has a semiconductive layer on the outer periphery of the conductor, a solid insulator on the outer periphery of the semiconductive layer, and a semiconductive layer on the outer periphery of the solid insulator. In a cable using a cable having a conductive layer as a winding, a plurality of the conductors are present in one cable (the invention of claim 6). According to this, when the cable is wound once, the conductor is wound a plurality of times, and therefore, the number of turns of the conductor is increased for the number of turns of the cable.
The space factor of the winding can be improved.

In this case, it is preferable that a plurality of conductors be arranged in a line in one cable (the invention of claim 7). In this case, since the cross-sectional shape of the cable can be lengthened in the direction in which the conductors are arranged, the cable can be wound with less waste of space, and the space factor of the winding can be further improved.

In place of the above-mentioned cable having a semiconductive layer on the outer periphery of the conductor, a solid insulator on the outer periphery of the semiconductive layer, and further having a semiconductive layer on the outer periphery of the solid insulator. Alternatively, a cable having a solid insulator on the outer periphery of the conductor and having a semiconductive layer on the outer periphery of the solid insulator may be used (the invention of claim 8). In this device, when used at a low applied voltage level, unnecessary semiconductive layers (inner semiconductive layers) on the outer periphery of the conductor are omitted, and the diameter of the cable can be reduced by that amount, so that the space factor of the winding is reduced. Can be better.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment in which the present invention is applied to industrial and electric power transformers will be described with reference to FIGS.
This will be described with reference to FIG. First, FIG. 1 shows an iron core 21, in particular, one leg 21 a thereof.
The primary winding 22 and the secondary winding 23 are wound concentrically around a. In this case, the secondary winding 23 is wound inside and the primary winding 22 is wound outside.

Of the two windings 22, 23, the primary winding 2
2, a cable 24 is used.
Is wound around the leg 21a of the iron core 21 as a winding. The cable 24 has a conductor 25 at the center as shown in FIGS.
6 and a solid insulator 27 on the outer periphery of the semiconductive layer 26 and a semiconductive layer 28 on the outer periphery of the solid insulator 27, that is, the same configuration as the conventional cable 11. The configuration (specifications) of each section 25 to 28 is the same as that of each section 12 to 15 of the conventional cable 11. Therefore, this cable 24 is also advantageous in terms of the insulating structure and environmentally friendly.

However, in this case, in the cable 24, the thickness of the solid insulator 27 is changed in the middle of the primary winding 22 so that the portion where the thickness of the solid insulator 27 is large (see FIG. 2 and a portion where the thickness of the solid insulator 27 is small (small diameter portion 24b shown in FIG. 3) (the diameter of the conductor 25, the thickness of the semiconductive layer 26, and the thickness of the semiconductive layer 26). The diameter and the thickness of the semiconductive layer 28 are the same, and the diameter of the semiconductive layer 28 differs according to the difference in the thickness of the solid insulator 27).

Further, in this case, the thickness of the solid insulator 27 of the cable 24 is changed as shown in FIG.
2 are changed in the middle of the outer periphery and the inner periphery, respectively, so that the large-diameter portion 24a (the portion where the thickness of the solid insulator 27 is large) is formed on the outer periphery and the inner periphery of the primary winding 22. The small diameter portion 24b (the portion where the thickness of the solid insulator 27 is small) is located at the other portion of the primary winding 22, that is,
It is located at an intermediate portion between the outer peripheral portion and the inner peripheral portion.

Next, the operation and effect of the above configuration will be described. Generally, when a steep abnormal voltage such as a lightning strike enters a transformer, the primary winding 22 connected to the penetration line
It has been known that the inclination of the potential at the end of is extremely large. When the thickness of the solid insulator 17 suitable for the end portion of the primary winding 22 to which the high potential is applied is applied to the entire cable 24, the excess solid insulator 17 is provided in the middle portion of the primary winding 22 where the potential is low. And the space factor of the primary winding 22 is deteriorated.

On the other hand, as described above, the cable 24
The thickness of the solid insulator 17 is changed in the middle of the primary winding 22 to increase the thickness of the solid insulator 17 only at the outer peripheral portion and the inner peripheral portion of the primary winding 22, and at the intermediate portion therebetween. In the case where the thickness of the solid insulator 17 is reduced, the thickness of the solid insulator 17 of the cable 24 can be increased only in necessary portions and reduced in other portions with respect to an abnormal penetration voltage. The excessive thickness can be reduced, and the space factor of the primary winding 22 can be improved.

In this case, in the cable 24, not only the thickness of the solid insulator 27 but also the diameter of the conductor 25 is changed in the middle of the primary winding 22 similarly to the thickness of the solid insulator 27. May be. Further, the cable 24 may be applied to a secondary winding.

4 to 17 show the second to ninth embodiments of the present invention.
The same parts as those in the embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described.

[Second Embodiment] The second embodiment shown in FIGS.
In the embodiment, the diameter of the conductor 25 of the cable 24 is changed in the middle of the primary winding 22 so that the conductor 2
Part 5 having the largest diameter (large diameter part 24c shown in FIG. 5)
And a portion where the diameter of the conductor 25 is smaller (the middle diameter portion 24d shown in FIG. 6) and a portion where the diameter of the conductor 25 is still smaller (the small diameter portion 24e shown in FIG. 7). The thickness of the semiconductive layer 26, the thickness of the solid insulator 27, and the thickness of the semiconductive layer 28 are the same, and their diameters are different in accordance with the difference in the diameter of the conductor 25).

In this case, the diameter of the conductor 25 of the cable 24 is changed as shown in FIG. As a result, the large diameter portion 24c is located at the uppermost position, the medium diameter portion 24d is located at the lower position, and the small diameter portion 2
4e is located further below (lowest).

Further, in this case, a fan 31 is provided below the primary winding 22. The fan 31 cools the primary winding 22 and the secondary winding 23 (not shown), and moves from the bottom to the top as shown by arrows in FIG. The cooling air is sent, so that the diameter of the conductor 25 of the cable 24 gradually increases from the windward side to the leeward side of the cooling air.

In this case, the primary winding 22
Is more likely to be higher on the leeward side (upper part) than on the leeward side (lower part) of the cooling air sent by the fan 31. When the diameter of the conductor 25 that suppresses the temperature of the leeward portion of the primary winding 22 to an allowable range is applied to the entire cable 24, the diameter of the conductor 25 is excessive on the leeward side of the primary winding 22, resulting in 1 The space factor of the next winding 22 is deteriorated.

On the other hand, as described above, the cable 24
In the case where the diameter of the conductor 25 is changed in the middle of the primary winding 22 so that the diameter of the conductor 25 gradually increases from the windward side to the leeward side of the cooling air, the temperature of the primary winding 22 increases. On the other hand, the diameter of the conductor 25 of the cable 24 can be increased only in a necessary portion and reduced in other portions, so that the excess diameter can be reduced.
The space factor of the next winding 22 can be improved.

In this case, the cable 24 is connected to the conductor 2
5 as well as the thickness of the solid insulator 27
The diameter may be changed in the middle of the primary winding 22 in the same manner. Further, the cable 24 may be applied to a secondary winding.

[Third Embodiment] In the third embodiment shown in FIGS. 8 and 9, the thickness of the solid insulator 27 of the cable 24 is changed by changing the outer diameter of the continuous solid insulator 27. I'm trying to do it. In this manner, the thickness of the solid insulator 27 of the cable 24 can be easily changed by, for example, changing the extrusion diameter of the cable 24 in a manufacturing process using an extruder.

The thickness of the solid insulator 27 of the cable 24 of the first embodiment is changed by this method.
Also, in the second embodiment, when the thickness is changed up to the thickness of the solid insulator 27 of the cable 24, this method may be used. Furthermore,
In this case, the thickness of the solid insulator 27 of the cable 24 is changed in the middle of the primary winding 22 in the vertical direction, but may be changed in the middle of the secondary winding 23 in the vertical direction. As in the case of the first embodiment, the operation may be performed in the middle between the outer and inner peripheral portions of the primary winding 22 or the secondary winding 23 and the intermediate portion therebetween.

[Fourth Embodiment] In a fourth embodiment shown in FIG. 10, the thickness of the solid insulator 27 of the cable 24 and / or the change of the diameter of the conductor 25 are changed by changing each of the different cables 24f. , 24g by a connection section 41. By doing so, the thickness of the solid insulator 27 of the cable 24 or the conductor 2
Changing the diameter of 5, or both, can be facilitated by connecting separate cables 24f, 24g.

The diameter of the conductor 25 in the second embodiment is changed by this method. Further, the thickness of the solid insulator 27 of the cable 24 of the first embodiment may be changed by this method. Further, in the case of changing the diameter up to the conductor 25 in the first embodiment, and in the second embodiment,
In the case where the thickness is changed up to the thickness of the solid insulator 27 of FIG.

Further, in this case, separate cables 24f,
The change of the thickness of the solid insulator 27 of the cable 24 by the connection of 24 g is performed in the middle of the primary winding 22 in the vertical direction, but may be performed in the middle of the secondary winding 23 in the vertical direction. As in the first embodiment, the operation may be performed in the middle between the outer and inner peripheral portions of the primary winding 22 or the secondary winding 23 and the intermediate portion therebetween.

[Fifth Embodiment] In the fifth embodiment shown in FIG. 11, the connection portion 41 to which the above-mentioned separate cables 24f and 24g are connected is connected to the non-winding position of the primary winding 22 (in this case, It is located at the axial end of the primary winding 22 (the upper end in the figure). The connection part 41 is a cable 2
In order to strengthen the insulation of the connection portions of the cables 4f and 24g, the diameters of the cables 24f and 24g are larger. Therefore,
If the connecting portion 41 exists between the lines where the primary winding 22 is wound (between the top and bottom in the figure), the space factor of the primary winding 22 is deteriorated.

On the other hand, by arranging the connecting portion 41 at the non-winding position of the primary winding 22 as described above,
Deterioration of the space factor of the primary winding 22 at the connection portion 41 can be avoided, and the space factor can be improved. In this case, the non-winding position of the primary winding 22 on which the connecting portion 41 is disposed is determined when the connecting portion 41 is inevitably located at an upper and lower part of the primary winding 22 in the drawing. It is good to set it as the position projected to the radial direction outside of the winding 22.

[Sixth Embodiment] In the sixth embodiment shown in FIG. 12, a partial discharge detection section 51 is provided at the connection section 41 arranged at the position where the primary winding 22 is not wound.
At the end of the primary winding 22, partial discharge is likely to occur due to electric field concentration. In contrast, as mentioned above,
When the partial discharge detecting section 51 is provided at the connection section 41 disposed at the position where the primary winding 22 is not wound, the partial discharge that easily occurs can be effectively detected, and the insulation state can be monitored.

Seventh Embodiment In the seventh embodiment shown in FIGS. 13 and 14, a cable 61 is used for the primary winding 22 instead of the cable 24 described above. The cable 61 has a semiconductive layer 63 on the outer periphery of a conductor 62, a solid insulator 64 on the outer periphery of the semiconductive layer 63, and a semiconductive layer 65 on the outer periphery of the solid insulator 64. Is the same as the above-described cable 24, but is different from the above-described cable 24 in that a plurality of conductors 62 (three in the illustrated example) are present in one cable 61. In this case, the semiconductive layer 63 also exists for each of the conductors 62, and the plurality of conductors 62 and the semiconductive layer 63 have an insulation distance from each other.

By doing so, the cable 61
Is wound a plurality of times, so that the number of turns of the conductor 62 can be increased relative to the number of turns of the cable 61, and the space factor of the primary winding 22 can be improved.

Eighth Embodiment In the eighth embodiment shown in FIGS. 15 and 16, a cable 71 is used for the primary winding 22 instead of the cable 24 described above. This cable 71 also has a semiconductive layer 73 around the conductor 72, a solid insulator 74 around the semiconductive layer 73, and a semiconductive layer 75 around the solid insulator 74. Is the same as the cable 24 described above, except that a plurality of conductors 72 (three in the illustrated example) are present in one cable 71 and the plurality of conductors 72 are arranged in a line. Different from cable 24.

Also in this case, the semiconductive layer 73 is
The plurality of conductors 72 and the semiconductive layer 73 have an insulation distance from each other. Further, in this case, the arrangement direction of the plurality of conductors 72 and the semiconductive layer 73 is vertical (up and down), and accordingly, the cross-sectional shape of the cable 71 is vertically long. Therefore, in this case, in addition to obtaining the same operation and effect as in the seventh embodiment, the cross-sectional shape of the cable 71 can be elongated in the direction in which the conductors 72 are arranged, so that the cables 71 are stacked in that direction. Is wound, the cable 71 can be wound with less waste of space, and the space factor of the primary winding 22 can be further improved.

[Ninth Embodiment] In the ninth embodiment shown in FIG. 17, a cable 81 is used instead of the cable 24 described above.
Is used. The cable 81 has the solid insulator 27 on the outer periphery of the conductor 25 and the semiconductive layer 28 on the outer periphery of the solid insulator 27, that is, the semiconductive layer 26 on the inner side of the cable 24 described above. Is omitted.

The inner semiconductive layer 26 serves to reduce the electric field at the interface of the conductor 25 and prevent corona discharge. Therefore, when a voltage that does not cause corona discharge is applied, the inner semiconductive layer 26 is unnecessary. Therefore, when the cable 81 is used at a low applied voltage level without corona discharge, the cable 81 having no semiconductive layer 26 inside the cable 81 can be used to reduce the diameter of the cable. Accordingly, the space factor of the primary winding 22 can be improved. In addition, the above-mentioned cable 61,
71 and 81 may be used for the secondary winding 23.
Further, the whole is not limited to the transformer, and the present invention can be similarly applied to and implemented in a reactor having the same situation as that of the insulation and cooling.

[0048]

The present invention is as described above.
The following effects are obtained. According to the static induction device of the first aspect, in the case where a cable which is advantageous in terms of insulation structure and is environmentally excellent is used for the winding, the thickness of the solid insulator of the cable, the diameter of the conductor, or those of them. By being able to make both large only in necessary parts and small in other parts, their excessive thickness and diameter can be reduced, and the space factor of the winding can be improved.

According to the stationary induction device of the second aspect, the thickness of the solid insulator of the cable can be easily changed during the manufacturing process of the cable. According to the stationary induction device of claim 3,
Changing the thickness of the solid insulation of the cable and / or the diameter of the conductor can be facilitated in the cable connection operation. According to the stationary induction device of the fourth aspect, it is possible to prevent the space factor of the winding from being deteriorated at the connection part where the cable is connected, and to improve the space factor of the winding.

According to the stationary induction device of the fifth aspect, it is possible to effectively detect a partial discharge which is likely to be generated due to electric field concentration at the end of the winding. According to the stationary induction device of the sixth aspect, the number of turns of the conductor can be increased relative to the number of turns of the cable, and the space factor of the winding can be improved. According to the stationary induction device of the seventh aspect, the cable can be wound with less waste of space, and the space factor of the winding can be further improved. According to the stationary induction device of the eighth aspect, when used at a low applied voltage level, an unnecessary semiconductive layer on the outer periphery of the conductor can be omitted, and the space factor of the winding can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a large diameter portion of a cable.

FIG. 3 is an enlarged vertical sectional view of a small diameter portion of the cable.

FIG. 4 is a front view of a main part showing a second embodiment of the present invention.

FIG. 5 is an enlarged longitudinal sectional view of a large diameter portion of the cable.

FIG. 6 is an enlarged longitudinal sectional view of a middle diameter portion of the cable.

FIG. 7 is an enlarged vertical sectional view of a small diameter portion of the cable.

FIG. 8 is a view corresponding to FIG. 4, showing a third embodiment of the present invention.

FIG. 9 is a partial perspective view of a cable.

FIG. 10 is a view corresponding to FIG. 4, showing a fourth embodiment of the present invention.

FIG. 11 is a perspective view of a single winding showing a fifth embodiment of the present invention.

FIG. 12 is a view corresponding to FIG. 11, showing a sixth embodiment of the present invention;

FIG. 13 is a view corresponding to FIG. 11, showing a seventh embodiment of the present invention.

FIG. 14 is an enlarged vertical sectional view of a cable.

FIG. 15 is a view corresponding to FIG. 11, showing an eighth embodiment of the present invention.

FIG. 16 is a diagram corresponding to FIG. 14;

FIG. 17 is a partial perspective view of a cable showing a ninth embodiment of the present invention.

FIG. 18 is a perspective view of an entire transformer showing a conventional example.

FIG. 19 is a diagram corresponding to FIG. 17;

[Explanation of symbols]

22 is a primary winding (winding), 24 is a cable, 24a is a large diameter portion, 24b is a small diameter portion, 24c is a large diameter portion, 24d is a medium diameter portion, 24e is a small diameter portion, and 24f and 24g are separate cables. , 25 is a conductor, 26 is a semiconductive layer, 27 is a solid insulator,
28 is a semiconductive layer, 31 is a fan, 41 is a connection part, 51 is a partial discharge detection part, 61 is a cable, 62 is a conductor, 63 is a semiconductive layer, 64 is a solid insulator, 65 is a semiconductive layer, 71 is A cable, 72 is a conductor, 73 is a semiconductive layer, 74 is a solid insulator, 75 is a semiconductive layer, and 81 is a cable.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Aida 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside the Toshiba Hamakawasaki Plant (72) Inventor Hiroshi Shioda 2121 Asahi, Mie-gun, Mie Prefecture Address: Inside the Mie Plant of Toshiba Corporation (72) Yoshihiro Takei 1-1-1, Shibaura, Minato-ku, Tokyo Inside the head office of Toshiba Corporation (72) Koichi Nishihara 1-1-1, Shibaura, Minato-ku, Tokyo F-term in Toshiba Corporation head office (reference) 5E043 AA02 AB01 AB09 BA01 BA03

Claims (8)

[Claims] A cable having a semiconductive layer on the outer periphery of a conductor, a solid insulator on the outer periphery of the semiconductive layer, and a semiconductive layer on the outer periphery of the solid insulator is used for winding. A stationary induction machine, wherein the thickness of the solid insulator and / or the diameter of the conductor of the cable is changed in the middle of the winding. 2. The method of claim 1, wherein the thickness of the solid insulator of the cable is changed.
2. The stationary induction device according to claim 1, wherein the outer diameter of the continuous solid insulator is changed. 3. The stationary according to claim 1, wherein the change in the thickness of the solid insulation of the cable and / or the diameter of the conductor is made by connecting the different separate cables. Shape induction equipment. 4. The connection section for connecting separate cables,
The stationary induction device according to claim 3, wherein the stationary induction device is arranged at a position where the winding is not wound. 5. The stationary induction device according to claim 4, wherein a partial discharge detection unit is provided at the connection unit. 6. A cable having a semiconductive layer on the outer periphery of a conductor, a solid insulator on the outer periphery of the semiconductive layer, and a semiconductive layer on the outer periphery of the solid insulator is used for winding. A stationary induction device, wherein a plurality of the conductors are present in one cable. 7. The stationary induction device according to claim 6, wherein a plurality of conductors are arranged in a line in one cable. 8. A conductor having a semiconductive layer on the outer periphery of the conductor, a solid insulator on the outer periphery of the semiconductive layer, and a conductor having a semiconductive layer on the outer periphery of the solid insulator. 2. A cable having a solid insulator on the outer periphery and a semiconductive layer on the outer periphery of the solid insulator.
8. The stationary guidance device according to any one of items 1 to 7.