JPH09326321A - Static induction instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an electric field at a corner from rising, by providing a cutout communicated with the corner of a winding in a first spacer in contact with a second spacer disposed on the inner diameter side of the winding. SOLUTION: A disk shaped winding 9 is formed by covering a conductor 10 with an insulating member 11 such as insulating paper and an insulating film or an insulating coated film and spirally winding them. A spacer 12 is disposed on the inner diameter side of the winding 9 at a predetermined interval peripherally of the winding 9. A spacer 13 supported with the spacer 12 is disposed perpendicularly to the spacer 12 at a predetermined interval peripherally of the winding 9 between a plurality of the windings 9 and a plurality of sections 15, on which the windings 9 and the sections 15 are laminated. A cutout 13a is provided in the spacer 13 such that it is communicated with a wedge shaped comer part 14 formed by allowing the inner diameter side of the winding 9 and each spacer 12, 13 to make contact with each other. Each spacer 12, 13 is a porous honeycomb structure where a hole is formed in the interior of a heat insulating board comprising only heat insulating synthetic fibers having a dielectric constant ε=2 to 2.4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction device such as a transformer or a reactor.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing a main part of a conventional static induction device disclosed in, for example, Japanese Patent Laid-Open No. 5-190354, FIG. 9 is a perspective view showing the main part of FIG. 8, and FIG. 8 is a cross-sectional view of the main part of FIG. 8 to 10, a plurality of windings 3 formed by coating a conductor 1 with an insulating member 2 such as an insulating paper, an insulating film, or an insulating film and winding the spiral 1 into a disc shape.
And the spacers 4 at predetermined intervals in the circumferential direction of the winding 3.
Are laminated. The spacer 4 is supported by a spacer 5 arranged in the axial direction of the winding 3 so as to be orthogonal to the spacer 4, and the winding 3 is surrounded by the spacers 4 and 5. The conductor 1 is wound from the outside to the inside or from the inside to the outside to form a plurality of sections 6. And
All of these are stored in a tank (not shown) together with an insulating medium such as insulating oil or sulfur hexafluoride (SF ₆ ) gas. By sandwiching the spacer 4 between the windings 3,
A cooling duct 7 through which an insulating medium flows is formed between the windings 3.

[0003]

Since the conventional static induction device is constructed as described above, the wedge-shaped corners in which the spacers 4 and 5 on the inner diameter side of the winding 3 and the winding 3 are in contact with each other. Part 8
Is formed. The wedge-shaped corner portion 8 has a very high electric field and a low breakdown voltage. In this case, when the dielectric constant of the insulating medium in the corner portion 8 is smaller than that of the insulator of the spacers 4 and 5, the higher the depth of the wedge-shaped corner portion 8, the higher the dielectric constant. Also,
The electric field in the wedge-shaped corner portion 8 rises as the ratio of the dielectric constants of the insulator and the insulating medium increases. As described above, since the electric field of the wedge-shaped corner portion 8 becomes high, there is a problem that it is difficult to improve the insulation reliability.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a static induction device capable of improving the insulation reliability of a wedge-shaped corner portion.

[0005]

According to a first aspect of the present invention, there is provided a static induction device, wherein a plurality of windings formed by spirally winding a conductor covered with an insulating member are provided between the windings. A first spacer is laminated at predetermined intervals in the circumferential direction, and the first spacer is supported by a second spacer arranged in the axial direction of the winding so as to be orthogonal to the first spacer,
In a static induction device in which each of the spacers surrounds the winding in a fluid insulating medium, a corner of the winding is attached to the first spacer in contact with the second spacer on the inner diameter side of the winding. The cutout portion is provided so as to be continuous with the portion.

In the static induction device according to the second aspect of the present invention, the first spacer and the second spacer are made of an insulator having a dielectric constant close to that of the insulating medium.

In the static induction device according to the invention of claim 3, a channel barrier made of an insulating member is arranged between the winding on the inner diameter side of the winding and the first spacer and the second spacer.

In the stationary induction device according to a fourth aspect of the present invention, the channel barrier is wider than the width of the first spacer in the circumferential direction of the winding.

In the stationary induction device according to the fifth aspect of the present invention, the gap between the corner on the inner diameter side of the winding and the channel barrier is filled with an insulating filler.

A stationary induction device according to a sixth aspect of the present invention uses a polyethylene or olefin rubber elastic body as a filler.
Alternatively, it is silicon grease.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. 1 is a sectional view showing an essential part of the first embodiment, and FIG. 2 is a sectional view showing an essential part of FIG. In FIGS. 1 and 2, reference numeral 9 denotes a disc-shaped winding, and the conductor 10 is made of an insulating member such as an insulating paper, an insulating film, or an insulating film.
And is wound in a spiral shape. 12 is a spacer,
The windings 9 are arranged on the inner diameter side of the windings 9 at predetermined intervals in the circumferential direction of the windings 9. Numeral 13 is a spacer supported by a spacer 12, which is arranged between a plurality of windings 9 and a section 15 described later at a predetermined interval in the circumferential direction of the winding 9 in a direction orthogonal to the spacer 12, And section 15 are stacked. The cutout portion 1 is formed so as to be continuous with the wedge-shaped corner portion 14 formed by the inner diameter side of the winding wire 9 and the spacers 12 and 13 contacting each other.
3 a is provided on the spacer 13. Each spacer 12, 1
3 is a heat-resistant board consisting of only heat-resistant synthetic fibers having a dielectric constant of ε = 2-2.4, a mixed paper board of pulp fibers and a low dielectric constant plastic film, a mixed paper board of pulp fibers and heat-resistant synthetic fibers, or the above. The honeycomb structure has a porous body in which pores are formed inside each material. Reference numeral 15 is a section in which the conductor 10 is wound from the outside to the inside or from the inside to the outside. The windings 9 and the section 15 are connected in series to form a winding structure. 16 is an insulating support. The winding structure composed of 9 to 16 is housed in a tank (not shown) in which an insulating medium such as insulating oil or a fluid of sulfur hexafluoride (SF ₆ ) gas is sealed.

In the above structure, since the notch 13a is provided so as to be continuous with the wedge-shaped corner portion 14, it is possible to prevent the electric field at the corner portion 14 from rising. In addition, the spacers 12, 13
Since it is made of an insulator having a low dielectric constant close to that of the insulating medium (insulating oil 2.2, SF ₆ gas 1.0), it is possible to prevent the electric field from rising.

Embodiment 2 FIG. 3 is a sectional view showing an essential part of the second embodiment, and FIG. 4 is a sectional view showing an essential part of FIG.
3 and 4, 9 to 14 are the same as those in the first embodiment. Reference numeral 17 denotes a U-shaped channel barrier that is wider than the circumferential width of the winding 9 and surrounds the inner diameter side of the winding 9. The dielectric constant of the insulating medium (insulating oil 2.2, SF ₆ gas 1.0) It is composed of an insulator with a dielectric constant close to.

In the above structure, the breakdown voltage of the corner portion 14 can be improved by surrounding the wedge-shaped corner portion 14 of the winding 9 having the highest electric field with the channel barrier 17. Further, since the notch 13a of the spacer 13 is provided, each of the spacers 12 and 13 has the channel barrier 1.
It is possible to improve the pressure resistance of the portion that abuts with 7. Furthermore, since the spacers 12 and 13 and the channel barrier 17 are made of an insulator having a dielectric constant close to that of the insulating medium, it is possible to prevent the electric field from rising.

Embodiment 3 FIG. 5 is a sectional view showing a main part of the third embodiment. In FIG. 5, 9 to 14 are the same as those in the first embodiment. 18 and 19 are winding 9
Each of the L-shaped channel barriers surrounds the inner diameter side thereof and is made of an insulator having a dielectric constant close to that of the insulating medium (insulating oil 2.2, SF ₆ gas 1.0).

In the above structure, since the wedge-shaped corner portion 14 of the winding 9 is surrounded by the L-shaped channel barriers 18 and 19, the breakdown voltage of the corner portion 14 can be improved. Further, since the distance between the corner portion 14 and the spacer 12 becomes large, the electric field concentration at the contact portion of the spacers 12 and 13 can be alleviated, and the cutout portion 13a can also have an improved breakdown voltage as in the first embodiment. . In addition, channel barrier 1
Since 8 and 19 are made of an insulator having a dielectric constant close to that of the insulating medium, the rise of the electric field can be prevented.

Embodiment 4 FIG. 6 is a sectional view showing a main part of the fourth embodiment. In FIG. 6, 9 to 14 are the same as those in the first embodiment. 17 is the second embodiment
Is similar to that of. Reference numeral 20 denotes a fill disposed between the spacer 12 and the channel barrier 17, which is made of an insulator having a dielectric constant close to that of the insulating medium.

In the above structure, by disposing the fill 20 between the spacer 12 and the channel barrier 17, it is possible to improve the breakdown voltage of the corner portion 14 where the electric field is highest. Further, since the distance between the cutout 13a and the corner 14 becomes large, the electric field concentration in the cutout 13a can be alleviated.

Embodiment 5 FIG. 7 is a sectional view showing the main parts of the fifth embodiment. In FIG. 7, 9 to 14 are the same as those in the first embodiment. 17 is the second embodiment
Is similar to that of. 21 is the dielectric constant of the insulating medium filling the corners 14 (insulating oil 2.2, SF ₆ gas 1.0)
A low dielectric constant filler close to that of polyethylene or olefin rubber elastic body or silicon grease.

In the above structure, by filling the wedge-shaped corner portion 14 with the filling material 21, the electric field of the corner portion 14 can be relaxed and the breakdown voltage can be improved.

Embodiment 6 In each of the above second to fifth embodiments, the channel barriers 17 to 19 are the spacers 13.
However, the same effect can be expected if the channel barrier is formed on the entire circumference of the winding 9 in the circumferential direction.

[0022]

According to the first aspect of the present invention, since the first spacer that is in contact with the second spacer on the inner diameter side of the winding is provided with the cutout portion connected to the corner portion of the winding, the corner portion is formed. It is possible to prevent the electric field from rising.

According to the second aspect of the present invention, since the first spacer and the second spacer are made of an insulator having a dielectric constant close to that of the insulating medium, it is possible to prevent the electric field at the corners from rising.

According to the invention of claim 3, since the channel barrier is arranged between the first spacer and the second spacer, the breakdown voltage at the corner can be improved.

According to the invention of claim 4, by disposing the channel barrier wider than the first spacer,
The breakdown voltage at the corners can be further improved.

According to the fifth aspect of the present invention, the electric field at the corner can be relaxed by filling the corner with the filler.

According to the sixth aspect of the present invention, since the filler is a polyethylene-based or olefin-based rubber elastic body or silicon grease, the permittivity is close to the permittivity of the insulating medium. Can be relaxed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a first embodiment.

FIG. 2 is a sectional view showing a main part of FIG.

FIG. 3 is a cross-sectional view showing the main parts of the second embodiment.

FIG. 4 is a sectional view showing a main part of FIG.

FIG. 5 is a cross-sectional view showing the main parts of the third embodiment.

FIG. 6 is a cross-sectional view showing the main parts of the fourth embodiment.

FIG. 7 is a cross-sectional view showing the main parts of the fifth embodiment.

FIG. 8 is a cross-sectional view showing a main part of a conventional static induction device.

9 is a perspective view showing a main part of FIG.

10 is a cross-sectional view showing the main parts of FIG.

[Explanation of symbols]

9 windings, 10 conductors, 11 insulating members, 12, 13
Spacer, 13a Cutout, 14 corners, 17 to 19 Channel barrier, 21 Filler.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Yoshikawa 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd.

Claims (6)

[Claims] 1. A first spacer is laminated between a plurality of windings formed by spirally winding a conductor covered with an insulating member, with a first spacer interposed at a predetermined interval in the circumferential direction of the winding. , Supporting the first spacer by a second spacer arranged in the axial direction of the winding so as to be orthogonal to the first spacer,
In a static induction device in which the winding is surrounded by an insulating medium of a fluid so as to surround the winding, the corner of the winding is attached to the first spacer that is in contact with the second spacer on the inner diameter side of the winding. A stationary induction device, characterized in that a cutout portion connected to the section is provided. 2. The static induction device according to claim 1, wherein the first spacer and the second spacer are insulators having a dielectric constant close to that of the insulating medium. 3. The static induction device according to claim 1, wherein a channel barrier made of an insulating member is arranged between the winding on the inner diameter side of the winding and the first spacer and the second spacer. . 4. The stationary induction device according to claim 3, wherein the channel barrier is wider than the width of the first spacer in the circumferential direction of the winding. 5. The stationary induction device according to claim 3, wherein a gap between the corner portion on the inner diameter side of the winding and the channel barrier is filled with an insulating filler. 6. The static induction device according to claim 5, wherein the filler is a polyethylene-based or olefin-based rubber elastic body or silicon grease.