JPH0847148A - Enclosed conductor device - Google Patents

Abstract

PURPOSE:To provide an enclosed conductor device which can capture conductive foreign matter easily without using an enclosed container of special construction. CONSTITUTION:An inclined shield 6 where the diameter on the insulation spacer 3 side is larger than that on the non-insulation side is mounted around a high voltage conductor 5 disposed inside an enclosed container 1 with the same potential as that of the high voltage conductor 5, and an inclined electrode 9 where the height on the insulation spacer side is larger than that on the non-insulation side is mounted at the bottom part of the enclosed container 1 with the same potential as that of the enclosed container 1. A foreign matter capture part 10 is formed on the non-insulation spacer side of the inclined electrode 9 to guide conductive foreign matter to the foreign matter capture part 10, using the inclination of the inclined shield 6 and the inclined electrode 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed conductor device in which a high voltage conductor is arranged in a closed container filled with an insulating gas.
In particular, the present invention relates to a closed conductor device suitable for DC power transmission.

[0002]

2. Description of the Related Art Generally, in this type of closed conductor device, an insulating spacer is fixed between the flanges of a closed container in which an insulating gas is filled, and a high-voltage conductor is electrically connected to a buried center conductor of the insulating spacer. In addition, the high-voltage conductor is electrically insulated from the closed container by mechanical support.

A major problem when such a closed conductor device is used for DC power transmission is that a conductive foreign substance enters the closed container for some reason, and the behavior of the conductive foreign substance in a gas space, Insulation performance is degraded due to adhesion of conductive foreign matter to the insulating spacer. In other words, the closed conductor device for DC power transmission has a constant electric field direction when a DC voltage is applied, unlike the case of an AC device. When it jumps up, it reaches the high-voltage conductor as it is and the conductive foreign matter is charged to the same polarity as the high-voltage conductor, falls again on the bottom surface inside the closed container on the low-voltage side, and the grounded sealed container and high-voltage conductor When the voltage applied to the high-voltage conductor has a polarity opposite to that of the charged conductive foreign matter, the conductive foreign matter emits light by repeating charging and discharging in the vicinity of the high-voltage conductor. , May float around high-voltage conductors with small vibrations (hereinafter referred to as fire-fly phenomenon). Further, if the conductive foreign matter adheres to the insulating spacer while repeating the above-mentioned reciprocating motion, the creeping dielectric strength of the insulating spacer is significantly reduced.

To prevent the deterioration of the insulation performance due to such conductive foreign matter, for example, the technical report of the Institute of Electrical Engineers of Japan (II
Part 3) No. 397 "DC Insulation of Gas Insulated Switchgear" (19)
As described on page 12 of (December 1991), the entire hermetically sealed container or the side of the hermetically sealed container is inclined, and the reciprocating motion of the conductive foreign matter under a DC electric field is used to make the incident angle and the reflection at the inclined part. There is known a closed conductor device in which conductive foreign matter is sequentially guided to the bottom side of a closed container due to the relationship of angles, and a foreign matter capturing section is formed at the bottom of the closed container.

[0005]

However, in the above-mentioned closed conductor device, it is necessary to manufacture a closed container having a special structure with an inclination. Since the insulating gas to be filled is at a predetermined pressure, the sealed container becomes a pressure container, and its manufacture is very troublesome and expensive.

An object of the present invention is to provide a closed conductor device which can easily capture a conductive foreign substance without using a closed container having a special structure.

[0007]

In order to achieve the above-mentioned object, the present invention encloses an insulative gas in a hermetically sealed container whose axial end is sealed by an insulating spacer, and at the same time, from the hermetically sealed container by the insulating spacer. In a closed conductor device supporting an insulated high voltage conductor, an end portion on the side of the insulating spacer is closer to the closed container than an end portion on the side of the anti-insulation spacer, at a portion located at least under the high voltage conductor. An inclined shield is provided, the inclined shield is made to have the same potential as the high-voltage conductor, and a foreign matter capturing portion is provided in the vicinity of an end of the inclined shield on the side opposite to the insulating spacer.

[0008]

In the sealed conductor device according to the present invention, the inclined shield is provided on the high-voltage conductor side as described above. Therefore, when a DC voltage is applied to the high-voltage conductor, the conductive foreign matter reciprocates between the inclined shield and the sealed container. However, at this time, the conductive foreign matter is gradually guided to the foreign matter capturing portion on the opposite side of the insulating spacer by the inclined surface of the inclined shield. Can be prevented.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial sectional perspective view of a sealed conductor device according to one embodiment of the present invention.

Flanges 2 are formed at both ends in the axial direction of the cylindrical hermetic container 1, respectively, and insulating spacers 3 are interposed between the flanges 2 of the adjacent hermetic containers 1, respectively, which are secured by bolts (not shown). Tightened and fixed. Insulating gas is enclosed in the gas compartment thus formed. An embedded center conductor 4 is provided at the center of the insulating spacer 3, and the embedded center conductor 4 has a tug
A long conductor is connected in the axial direction via a connection portion 7 such as a lip-type contact to form a high-voltage conductor 5. An inclined shield 6 is arranged on the outer peripheral portion of the high-voltage conductor 5, and the inclined shield 6 has a substantially tubular shape as a whole.
It is manufactured so that the diameter on the side close to the insulating spacer 3 is large and the diameter becomes smaller as the distance from the insulating spacer 3 increases, and it is formed at the same potential as the high-voltage conductor 5. The details of the inclined shield 6 are divided into three in the circumferential direction as shown in FIG. 2 which is a vertical cross-sectional view of FIG. 1, and the opposing portions of each of the inclined shields are rounded inside, for example, arranged on the lower side. Folded portions 6A1 and 6A2 are formed at the left and right ends of the inclined shield 6A.

As shown in FIGS. 1 and 2, an inclined electrode 9 is disposed on the side of the closed vessel 1 at a position facing the inclined shield 6A. The distance from the inner surface of the sealed container 1 is large so as to be closer to the inner surface of the sealed container 1 so as to be farther from the high-voltage conductor 5 as the distance from the insulating spacer 3 is increased. Made to ground potential. A perspective view of this inclined electrode 9 is shown in FIG. 4. As can be seen from the figure, the side close to the insulating spacer 3 is separated from the inner surface of the hermetically sealed container 1, so that the hermetically sealed container 1 is welded or fixed by another fixing method described later. In the vicinity of the mounting portion 9B at the same side end to be fixed, the electric field relaxation portion 9C having a curved surface with a relatively large radius of curvature can be formed. In the closed container 1 corresponding to the end of the inclined electrode 9 on the side opposite to the insulating spacer or the same end, a concave portion or the like which is recessed from the surface of the inclined electrode 9 on the side of the high voltage conductor 5 is formed as a low electric field portion. A foreign matter capturing section 10 is formed.

FIG. 9 is an enlarged sectional view of a main part showing a method of fixing the above-mentioned inclined electrode 9.

An insulating spacer 3 is interposed between the flanges 2 of the adjacent closed containers 1, and these are fastened by bolts 23. A concave portion is formed inside the flange 2 on the insulating spacer 3 side, and the mounting portion 9B which is the end portion of the tilted electrode 9 is positioned in the concave portion and fixed by the bolt 24. The inclined electrode 9 is stepped so as to match the attachment of the insulating spacer 3 to the concave portion. However, the shape is not limited because it can be fixed to the inner surface of the closed vessel 1 by welding or bolts. The entire surface up to the electric field relaxation portion 9C may be formed as a smooth curved surface. Since such an inclined electrode 9 can be attached to the closed container 1 in advance, it is possible to suppress mixing of a conductive foreign substance in the same portion. Further, the distance L3 formed between the bolt 24 and the insulating spacer 3 and the electric field relaxation portion 9C of the inclined electrode 9 are provided.
L4 between the insulating spacer 3 and the height H of the inclined shield,
Since the electric field in these spaces is relaxed by disposing the shield 25 embedded in the insulating spacer 3 at an appropriate position, tentatively, in these regions near the insulating spacer 3,
Even if the conductive foreign matter 8 enters, the deterioration of the insulation performance can be suppressed small.

FIG. 2 is a vertical cross-sectional view of FIG. 1, which also shows the principle of operation of the conductive foreign matter.

If the conductive foreign matter 8A enters the vicinity of the insulating spacer 3 in the closed container 1 for some reason and a high DC voltage is applied to the high-voltage conductor 5, the inclined shield 6 and the inclined electrode 9 The conductive foreign material 8A repeats reciprocating motion between the inclined spacer 6 and the inclined electrode 6, and the electric field between the inclined shield 6 and the inclined electrode 9 is higher near the insulating spacer 3 and becomes lower as the distance from the insulating spacer 3 increases. The conductive foreign material 8A repeats the above-described reciprocating motion and moves toward the foreign material capturing unit 10 while repeating the above-described reciprocating motion. It will be captured by the capture unit 10.

However, since the normal behavior of the conductive foreign matter 8A is irregular in the central axis direction and the circumferential direction of the closed container 1, it is better to capture the foreign matter 8A as early as possible. This is advantageous in preventing adhesion. Therefore, in order to improve the trapping efficiency in the initial stage, the tilted shield 6 is divided into a plurality of pieces in the circumferential direction, and the gap 1 is formed in each of the facing portions of the tilted shields 6A, 6B, 6C.
1 is formed. In particular, the conductive foreign matter 8A also moves in the circumferential direction of the closed container 1 during the reciprocating motion as described above, but most of it moves in the lower half range of the closed container 1, so that the conductive foreign matter 8A reciprocates. During movement, it easily passes through the gaps 11 formed on both sides of the lower tilted shield 6A and enters between the tilted shield 6 and the high-voltage conductor 5. Therefore,
The width L1 of the inclined shield 6A is made smaller than the diameter L2 of the high voltage conductor 5 to form gaps 11 on both sides of the inclined shield 6A, and the inclined shield 6A has the high voltage conductor 5 at its end.
6A1, 6A2 bent inward toward
On the other hand, the inclined electrode 9 has an inner surface on the high voltage conductor 5 side, for example, a curved surface having a predetermined radius and having the same center as that of the high voltage conductor 5 in FIG. Therefore, the probability that the conductive foreign matter 8 enters through the gap 11 formed on both sides of the inclined shield 6A increases, and once the conductive foreign matter 8 enters through the gap 11 like the conductive foreign matter 8C in FIG. Since the conductor 5 has the same potential, the conductor 5 does not jump out and reciprocate again. Moreover, since the inclined shield 6A is formed with the bent portions 6A1 and 6A2, it becomes difficult for the conductive foreign matter 8C to jump out again even if mechanical vibration is applied, and the trapping efficiency in the initial stage is improved.

For the same reason as described above, the inclined electrode 9 may be disposed only near the bottom of the closed container 1, and furthermore, at both circumferential ends of the inclined electrode 9, a gap is formed between the inclined electrode 9 and the closed container 1. 12 is formed, and bent portions 9A1 and 9A2 that are bent toward the closed container 1 side are formed. Although a difference occurs in the electric field near both ends in the circumferential direction of the inclined electrode 9, even if the conductive foreign matter 8D moves outward from the inclined electrode 9 while moving in the circumferential direction in FIG. No closed container 1
Since the electric field on the inner surface of the conductive foreign substance is small, the reciprocating motion of the conductive foreign matter 8D is suppressed, and the conductive foreign substance 8D enters through the gap 12 and is reliably captured in the inclined electrode 9. Once the foreign matter 8D enters and is captured through the gap 12 like the conductive foreign matter 8D in FIG. 2, the tilted electrode 9 and the hermetically sealed container 1 are at the same potential and do not jump out to reciprocate again. In addition, since the bent portions 9A1 and 9A2 are formed in the inclined electrode 9, it becomes difficult for the conductive foreign matter 8D to jump out again even when mechanical vibration is applied, and the trapping efficiency in the initial stage is improved. Therefore, it is possible to prevent the conductive foreign matter 8 from adhering to the insulating spacer 3 and lowering the insulating performance.

FIG. 3 shows a specific shape of the inclined shield 6. In this embodiment, the inclined shield 6 is divided into three in the circumferential direction, but the number of divisions may be changed. By thus forming the tilted shield 6 in a divided structure, workability in manufacturing and assembling can be improved as compared with the case where the whole tilted shield has a cylindrical shape. Further, the inclined shield 6 does not necessarily have to be a cylindrical shape that is arranged concentrically with the high voltage conductor 5, and basically the high voltage is taken into consideration in consideration of the behavior of the conductive foreign matter 8 in the substantially limited region. The shape and the like may be determined so as to be located under the conductor 5 and the other portion in consideration of the electric field. In any case, these inclined shields 6 are made conductive by keeping the diameter of the insulating spacer 3 side larger than the anti-insulating spacer side so that the insulating spacer 3 side is closer to the closed container 1 than the anti-insulating spacer side. Since the foreign material 8 is inclined so as to move to the foreign material capturing portion 10, it is easy to form an electric field relaxation portion having a large curvature on the insulating spacer 3 side to prevent electric field concentration. The electric field in the vicinity can be alleviated at the same time, and the dielectric strength of the creeping surface of the insulating spacer 3 can be improved.

FIG. 5 is a vertical sectional view showing a sealed conductor device according to another embodiment of the present invention.

Both ends in the axial direction of the closed container 1 are gas-divided by insulating spacers 3A and 3B, respectively, and a high voltage conductor 5A is provided in a buried center conductor 4A of the insulating spacer 3A.
One end of the high voltage conductor 5B is similarly fixed to the embedded center conductor 4B of the other insulating spacer 3B as shown in FIG. The large-diameter portion of the inclined shield 6 provided so as to cover the high-voltage conductor 5A is fixed to the high-voltage conductor 5A by bolts 19 as shown in FIG. 6, and the small-diameter portion of the inclined shield 6 is shown in FIG. Is fixed by the bolt 20 to the high voltage conductor 5A.
The inclined shield 6 provided so as to cover the high voltage conductor 5B is also fixed in the same manner. The opposite ends of the high-voltage conductors 5A and 5B are electrically connected by a connecting portion 16 including a tulip-shaped contact 13 and an electric field relaxation shield 14 as shown in the sectional view of FIG. ing. Since the diameter of the electric field relaxation shield 14 is larger than that of the high voltage conductors 5A and 5B, it is also used as a conductive foreign matter capturing shield. Specifically, as shown in FIG.
Gaps 17A and 17B are formed at both ends of the lower portion of the groove 14 in the axial direction, respectively, and turn-back portions 14A1 and 14A2 are formed by turning the same portions inward.

For this reason, the conductive foreign matter 8 having moved to the connection portion 16 enters through the gaps 17A and 17B formed at both ends in the axial direction of the electric field alleviating shield 14, and is captured in the same manner as in the case of the above-mentioned inclined shield 6. It does not fly out even if a subsequent mechanical vibration is applied. In addition, the conductive foreign substance 8 is subjected to a sudden change in the electric field in the vicinity of the electric field alleviating shield 14 so that the foreign substance capturing section
The result is a catch.

FIG. 8 is a vertical sectional view showing a main part of a hermetically sealed conductor device according to still another embodiment of the present invention.

The sealed conductor device of this embodiment differs from the sealed conductor device shown in FIG. 5 in the position of the connecting portion 16. That is, the contact receiving conductor 21 and the electric field mitigating shield 14 are fixed to the embedded center conductor 4 of the insulating spacer 3 by the bolts 22, and the opposite side of the high voltage conductor 5 is arranged by the contact 13 arranged in the electric field mitigating shield 14. The other end of the high-voltage conductor 5 (not shown) is directly fixed to and supported by an insulating spacer on the opposite side. When the connecting portion 16 is located near the insulating spacer 3 in this way, it is not always necessary to surround the contactor 13 with the inclined shield 6 as in the embodiment shown in FIG.
The electric field relaxation shield 14 and the inclined shield 6 may be juxtaposed in the axial direction. Also in this embodiment, since the electric field mitigating shield 14 has an opening for inserting the opposite side end of the high-voltage conductor 5, the conductive foreign matter 8 that has entered through this opening can be captured. In addition, the shape of the electric field relaxing shield 14 can reduce the electric field of the insulating spacer 3, and can provide substantially the same effect as the embodiment shown in FIG.

FIG. 10 is a longitudinal sectional view of a sealed conductor device according to still another embodiment of the present invention. Among the inclined shields 6 provided around the high-voltage conductor 5, in particular, facing the bottom side of the sealed container 1. A constraining film 26 such as an adhesive sheet or a high dielectric constant coating is applied to the high voltage conductor 5 side of the provided inclined shield 6A. Of course, such a constrained coating 2
6 may also be applied to the inclined shields 6b and 6C. Gap 1
The conductive foreign matter 8 that has entered from 1 moves by the constraining film 26 in addition to the inclined shield 6A and the high-voltage conductor 5 having the same potential, the folded parts 6A1 and 6A2 being formed on the inclined shield 6A. Is restrained, the conductive foreign matter 8 does not jump out of the gap 11 even when a larger mechanical vibration is applied to the closed conductor device.

FIG. 11 is a longitudinal sectional view of a sealed conductor device according to still another embodiment of the present invention. Among the inclined shields 6 provided around the high-voltage conductor 5, particularly, facing the bottom side of the sealed container 1. The insulating shield 27 is formed by coating or the like on the inclined electrode 9 side of the provided inclined shield 6A. Such an insulating coating 27 may be applied to the inclined shields 6b and 6C. By providing this insulating coating 27, it is possible to prevent a minute discharge that has occurred when the conductive foreign matter 8 is in the vicinity of the inclined shield 6A, and to prevent a decrease in the dielectric strength of the same portion due to this.

In each of the above-described embodiments, at least the inclined shield 6A and the inclined electrode 9 are provided between the bottom of the closed container 1 and the high voltage conductor 5 facing the closed container 1. Even if 9 is omitted and only the inclined shield 6A is provided, the conductive foreign matter can be guided by collision with the inclined shield 6A to the foreign matter capturing unit 10.

[0028]

As described above, according to the hermetically-sealed conductor device of the present invention, the high-voltage conductor facing the bottom of the hermetically sealed container is provided with the inclined shield, and the end of the inclined shield on the side of the insulating spacer is sealed from the other end. , Even if conductive foreign matter is mixed and reciprocated between the inclined shield and the sealed container, the conductive foreign matter can be gradually guided to the anti-insulating spacer side by using the inclination of the inclined shield, The conductive foreign matter can be easily captured by the foreign matter capturing portion without using a closed container having a special structure, and the dielectric strength of the insulating spacer can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a sealed conductor device according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the closed conductor device shown in FIG.

3 is an enlarged view of a main part of the closed conductor device shown in FIG.

FIG. 4 is an enlarged view of another main part of the sealed conductor device shown in FIG. 1;

FIG. 5 is a longitudinal sectional front view of a sealed conductor device according to another embodiment of the present invention.

FIG. 6 is an enlarged view of a main part of the sealed conductor device shown in FIG.

7 is an enlarged view of another main part of the closed conductor device shown in FIG.

FIG. 8 is a vertical cross-sectional front view showing a main part of a sealed conductor device according to still another embodiment of the present invention.

9 is an enlarged cross-sectional view of still another main part of the closed conductor device shown in FIG.

FIG. 10 is a vertical cross-sectional side view showing a main part of a closed conductor device according to still another embodiment of the present invention.

FIG. 11 is a vertical cross-sectional side view showing a main part of a sealed conductor device according to still another embodiment of the present invention.

[Explanation of symbols]

 1 Airtight Container 2 Flange 3 Insulation Spacer 5 High Voltage Conductor 6 Inclined Shield 6A1, 6A2 Folded Part 8 Conductive Foreign Material 9 Inclined Electrode 9A1, 9A2 Folded Part 9C Electric Field Mitigating Part 10 Foreign Material Capture Part 11, 12 Gap 26 Restraint Film 27 Insulation Film

Front Page Continuation (72) Inventor Kenji Anno 1-1-1, Kokubuncho, Hitachi City, Ibaraki Hitachi Co., Ltd. Kokubun Factory (72) Inventor Tokio Yamagoku 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture Stock Company Hitachi Kokubun Plant (72) Inventor Naoaki Takeharu 3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Kansai Electric Power Co., Inc. (72) Inventor Koji Yamaji 2-5 Shikoku Electric Power Company, Marunouchi, Takamatsu City, Kagawa Prefecture In-house (72) Inventor Hiroyuki Shirakawa 6-15-1 Ginza, Chuo-ku, Tokyo Power source development Co., Ltd.

Claims (8)

[Claims] 1. A sealed conductor device in which an insulating gas is sealed in a sealed container whose axial end is sealed by an insulating spacer, and which is insulated from the sealed container by the insulating spacer to support a high-voltage conductor. At least a lower portion of the voltage conductor is provided with an inclined shield whose end on the insulating spacer side is closer to the closed container than the end on the anti-insulating spacer side, and the inclined shield is placed at the same potential as the high-voltage conductor. And a foreign matter capturing portion is provided near an end of the inclined shield on the side opposite to the insulating spacer. 2. The hermetically sealed conductor according to claim 1, wherein the inclined shield arranged below the high-voltage conductor has a gap formed at both ends in the circumferential direction of the high-voltage conductor. apparatus. 3. The hermetically sealed structure according to claim 2, wherein the inclined shield is formed with a folded-back portion that is folded back toward the high-voltage conductor at both ends of the high-voltage conductor in the circumferential direction. Conductor device. 4. The high-voltage conductor according to claim 1, wherein the inclined shield is divided into a plurality of parts in a circumferential direction of the high-voltage conductor. A hermetically-sealed conductor device characterized in that folded-back portions folded back toward the high-voltage conductor are formed at both ends of the voltage conductor in the circumferential direction, and a gap is formed between the folded shield and another inclined shield. 5. The high-voltage conductor according to claim 1, wherein the inclined shield is divided into a plurality of pieces in the circumferential direction of the high-voltage conductor, and the inclined shield is arranged so as to surround the outer periphery of the high-voltage conductor. A hermetically-sealed conductor device, wherein an end portion of each inclined shield on the side of the insulating spacer is made larger in diameter than an end portion on the side of the anti-insulating spacer. 6. The sealed container according to claim 1, further comprising: an inclined electrode having the same potential as that of the sealed container, provided on the sealed container side, opposite to the inclined shield disposed below the high-voltage conductor. A closed conductor device wherein the end of the inclined electrode on the insulating spacer side is closer to the high voltage conductor side than the end on the anti-insulating spacer side. 7. The electrode according to claim 6, wherein the tilted electrode is formed with a folded-back portion that is folded back toward the closed container at both ends in the circumferential direction of the closed container, and is provided between the tilted electrode and the closed container. A sealed conductor device characterized in that a gap is formed in the closed conductor device. 8. The hermetic conductor device according to claim 1, wherein an insulating coating is provided on a surface of the inclined shield disposed below the high-voltage conductor on the hermetic container side.