JP7378304B2 - gas insulated switchgear - Google Patents

Description

The present disclosure relates to a gas-insulated switchgear having an expansion pipe joint.

A gas-insulated switchgear installed in an electric power transmission and distribution system to open and close a circuit has a current-carrying conductor that is insulated and supported within a container filled with an insulating gas. Gas insulated switchgear is sometimes provided with an expandable pipe joint that is expandable and retractable in order to adjust the length of the current-carrying conductor in the direction of the central axis. By installing expansion pipe joints, when gas insulated switchgear is installed or when an accident occurs in gas insulated switchgear, it is possible to remove the parts of the busbar or track that make up the gas insulated switchgear that require work. The current-carrying conductor can be easily attached or removed.

Insulating gas is sealed inside the expansion pipe joint. Patent Document 1 discloses a gas insulated switchgear that includes a bellows-shaped expansion joint and a container connected to one end of the expansion joint, and in which an adsorbent is accommodated in a hand hole provided in the container. has been done. The gas insulated switchgear according to Patent Document 1 is provided with an adsorbent to remove moisture contained in the insulating gas inside the expansion pipe joint.

Utility Model Publication No. 63-160012

According to the conventional technology disclosed in Patent Document 1, it is difficult to downsize the gas-insulated switchgear because the container having the hand hole is connected to the expansion pipe joint, which increases the dimension in the direction of the central axis. There was a problem.

The present disclosure has been made in view of the above, and an object of the present disclosure is to obtain a gas-insulated switchgear that enables miniaturization.

In order to solve the above-mentioned problems and achieve the objects, a gas insulated switchgear according to the present disclosure includes a current-carrying conductor and a sealed structure that can expand and contract in the direction of the central axis of the current-carrying conductor and that accommodates the current-carrying conductor. An expansion pipe joint that forms a space and fills an insulating gas in the sealed space, and a plate that is provided inside the expansion joint and faces the inner wall surface that is the inside surface of the expansion joint. , an adsorbent disposed in the gap between the inner wall surface and the plate material to adsorb moisture contained in the insulating gas. Expansion joints are bellows-shaped expansion joints with multiple pleats. The plurality of folds include expansion folds that are expanded in the direction of the central axis compared to other folds of the plurality of folds. The adsorbent is placed inside the expansion folds.

The gas insulated switchgear according to the present disclosure has the advantage that it can be downsized.

A sectional view showing a part of the gas insulated switchgear according to the first embodiment. Cross-sectional view of an expansion pipe joint included in the gas-insulated switchgear according to Embodiment 1 Cross-sectional view showing a part of the gas insulated switchgear according to the second embodiment Cross-sectional view of an expansion pipe joint included in the gas-insulated switchgear according to Embodiment 2

Below, a gas insulated switchgear according to an embodiment will be described in detail based on the drawings. Note that the present disclosure is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a sectional view showing a part of the gas insulated switchgear according to the first embodiment. FIG. 2 is a sectional view of an expansion pipe joint included in the gas insulated switchgear according to the first embodiment. The gas insulated switchgear 1 according to the first embodiment has a bellows-shaped expansion joint 10. FIG. 2 shows a cross section of the expansion pipe joint 10 taken along line II-II shown in FIG.

The gas insulated switchgear 1 includes a current-carrying conductor 2 and a plurality of containers connected to each other. The plurality of containers constitute a sealed space filled with insulating gas. FIG. 1 shows two containers 3 and 4 that are connected to each other via an expansion joint 10 among a plurality of containers. An example of an insulating gas is _SF6 gas. The current-carrying conductor 2 is housed in a sealed space. FIG. 1 shows a longitudinal section of the current-carrying conductor 2 including the central axis 7. As shown in FIG. The containers 3 and 4 each have a cylindrical shape centered on the central axis 7.

The expansion and contraction joint 10 is capable of expansion and contraction in the direction of the central axis 7. The expansion joint 10 constitutes a sealed space in which the current-carrying conductor 2 is accommodated. Insulating gas is sealed in the closed space of the expansion pipe joint 10. The expansion joint 10 has a plurality of folds arranged in the direction of the central axis 7. As each of the plurality of pleats expands and contracts in the direction of the central axis 7, the telescopic pipe joint 10 expands and contracts in the direction of the central axis 7.

The flange 13 is provided at one end of the expansion joint 10 in the direction of the central axis 7 . The flange 14 is provided at the other end of the expansion joint 10 in the direction of the central axis 7 . An insulating spacer 5 is provided between the container 3 and the flange 13. The insulating spacer 5 partitions the sealed space of the container 3 and the sealed space of the expansion pipe joint 10. An insulating spacer 6 is provided between the container 4 and the flange 14. The insulating spacer 6 partitions a closed space inside the container 4 and a closed space inside the expansion pipe joint 10. Tie rods 15 and 16 connect flange 13 and flange 14, respectively.

The plurality of pleats formed in the expansion joint 10 include expansion pleats 12 . The expanded folds 12 are expanded in the direction of the central axis 7 compared to other folds among the plurality of folds. The expansion fold 12 is located in the center of the expansion joint 10 in the direction of the central axis 7.

The gas insulated switchgear 1 has a plate member 11 provided inside the expansion pipe joint 10. The plate material 11 is a thin plate that is curved in an arc shape in the cross section shown in FIG. The plate material 11 is arranged such that the arc end portion of the plate material 11 corresponding to the end of the circular arc faces vertically upward. The plate material 11 faces the inner wall surface of the expansion pipe joint 10. The inner wall surface is the inner surface of the expansion pipe joint 10. The inner wall surface is corrugated in the cross section shown in FIG.

A flange 11 a is provided at one end of the plate 11 in the direction of the central axis 7 . Flange 11a is fixed to flange 13. The other end of the plate 11 in the direction of the central axis 7 is closer to the flange 14 than the expansion folds 12 in the direction of the central axis 7 .

The gas insulated switchgear 1 includes an adsorbent that adsorbs moisture contained in the insulating gas. The adsorbent is arranged in the gap between the inner wall surface of the expansion pipe joint 10 and the plate material 11. In the first embodiment, the adsorbent is placed in the expansion folds 12 while being housed in the case 8 . The dimensions of the expansion fold 12 in the direction of the central axis 7 are such that the case 8 can fit inside the expansion fold 12 . The number of cases 8 disposed inside the expansion pipe joint 10 is arbitrary. The case 8 is not fixed in the gap between the inner wall surface of the expansion pipe joint 10 and the plate material 11. By introducing the case 8 vertically downward from the arcuate end of the plate material 11 along the expansion folds 12, the adsorbent is placed in the gap between the inner wall surface of the expansion pipe joint 10 and the plate material 11. In the gap between the inner wall surface of the expansion pipe joint 10 and the plate material 11, the case 8 remains vertically downward due to the influence of gravity. Because the plate material 11 with its arcuate end facing vertically upward faces the inner wall surface of the expansion joint 10, the adsorbent moves toward the current-carrying conductor 2 inside the expansion joint 10. is suppressed.

By providing the plate material 11, the gas insulated switchgear 1 can arrange an adsorbent inside the expansion pipe joint 10 without fixing the adsorption agent to the inner wall surface of the expansion pipe joint 10. The gas insulated switchgear 1 can remove moisture contained in the insulating gas inside the expansion pipe joint 10 by disposing an adsorbent inside the expansion joint 10 .

The inner part of the folds inside the expansion joint 10 is the part of the expansion joint 10 that projects in the direction away from the central axis 7 . In the gas-insulated switchgear 1, by placing the adsorbent inside the folds, the adsorbent can be placed at a position away from the current-carrying conductor 2 within the closed space of the expansion pipe joint 10.

In the gas insulated switchgear 1, the folds in which the adsorbent is arranged are expansion folds 12, so that the adsorbent housed in the case 8 is arranged in the gap between the inner wall surface of the expansion pipe joint 10 and the plate material 11. be able to. Note that the expansion folds 12 for arranging the adsorbent do not need to be formed in the expansion pipe joint 10. The folds on which the adsorbent is placed may have the same dimensions as the other folds among the plurality of folds that the expansion pipe joint 10 has.

In the gas-insulated switchgear 1, since the adsorbent can be placed inside the telescopic pipe joint 10, there is no need to provide a hand hole for accommodating the adsorbent separately from the telescopic pipe joint 10. Since there is no need to connect a container having a hand hole to the expansion joint 10, the gas insulated switchgear 1 can be shortened in size in the direction of the central axis 7. Thereby, the gas insulated switchgear 1 can be downsized. By making it possible to downsize the gas insulated switchgear 1, the degree of freedom in designing the gas insulated switchgear 1 can be improved.

Note that the shape of the plate material 11 is not limited to the shape described in the first embodiment. It is sufficient that the plate material 11 can be provided on the inner wall surface of the expansion joint 10 so as to face each other, and the shape of the plate material 11 may be other than the curved shape of a circular arc. Furthermore, the plate material 11 may be fixed to a component other than the flange 13.

According to Embodiment 1, the gas insulated switchgear 1 has the plate material 11 facing the inner wall surface of the expansion pipe joint 10, and the adsorbent is disposed in the gap between the inner wall surface and the plate material 11. This has the effect of enabling miniaturization.

Embodiment 2.
FIG. 3 is a sectional view showing a part of the gas insulated switchgear according to the second embodiment. FIG. 4 is a sectional view of an expansion pipe joint included in the gas insulated switchgear according to the second embodiment. The gas insulated switchgear 1 according to the second embodiment has a slide-type expansion pipe joint 20. FIG. 4 shows a cross section of the expansion pipe joint 20 taken along the line IV--IV shown in FIG. In Embodiment 2, the same components as in Embodiment 1 described above are given the same reference numerals, and configurations that are different from Embodiment 1 will be mainly explained.

The expansion pipe joint 20 includes a cylindrical first part 23, a cylindrical second part 24, and a third part 25 connected between the first part 23 and the second part 24. and has. The first component 23 is fixed to the insulating spacer 5. The second component 24 is fixed to the insulating spacer 6. The first component 23 is allowed to slide relative to the third component 25 in the direction of the central axis 7 . The second component 24 is allowed to slide relative to the third component 25 in the direction of the central axis 7 . The third component 25 has a shape that projects further away from the central axis 7 than the inside of the cylinder of the first component 23 and the inside of the cylinder of the second component 24 . Note that even if the expansion joint 20 is capable of either sliding the first component 23 with respect to the third component 25 or sliding the second component 24 with respect to the third component 25, good.

The plate materials 21 and 22 are provided inside the expansion pipe joint 20. The plate members 21 and 22 are provided at a portion of the third component 25 that protrudes in a direction away from the central axis 7. An end portion 21 a of the plate material 21 is fixed to a vertically lower portion of the third component 25 . An end portion 22a of the plate material 22 is fixed to a vertically upper portion of the third component 25. The plate materials 21 and 22 are each opposed to the inner wall surface of the expansion pipe joint 20.

The adsorbent is arranged in the gap between the inner wall surface of the expansion pipe joint 20 and the plate material 21 and in the gap between the inner wall surface of the expansion pipe joint 20 and the plate material 22. In the second embodiment, the adsorbent is placed in a portion of the third component 25 that protrudes in a direction away from the central axis 7 while being housed in the case 8 . The dimensions of the portion in the direction of the central axis 7 are such that the case 8 can be inserted therein.

In the gap between the inner wall surface of the expansion pipe joint 20 and the plate material 21, the case 8 is not fixed. The case 8 remains on the inner wall surface of the expansion pipe joint 20 within the gap due to the influence of gravity. The case 8 is not fixed in the gap between the inner wall surface of the expansion pipe joint 20 and the plate material 22. The case 8 remains on the plate 22 in the gap due to the influence of gravity. Since each of the plate materials 21 and 22 faces the inner wall surface of the expansion joint 20, movement of the adsorbent toward the current-carrying conductor 2 inside the expansion joint 20 is suppressed. Note that the case 8 disposed in the gap between the inner wall surface of the expansion pipe joint 20 and the plate material 21 may be fixed to the plate material 21. The case 8 disposed in the gap between the inner wall surface of the expansion pipe joint 20 and the plate material 22 may be fixed to the plate material 22.

By providing the plate members 21 and 22, the gas insulated switchgear 1 can arrange an adsorbent inside the expansion pipe joint 20 without fixing the adsorption agent to the inner wall surface of the expansion pipe joint 20. The gas insulated switchgear 1 can remove moisture contained in the insulating gas inside the expansion pipe joint 20 by disposing an adsorbent inside the expansion joint 20 .

The gas-insulated switchgear 1 has an adsorbent placed on a portion of the third component 25 that protrudes away from the central axis 7, so that the gas-insulated switchgear 1 can be placed at a position away from the current-carrying conductor 2 in the closed space of the expansion joint 20. An adsorbent can be placed on the Further, in the second embodiment as well, the gas insulated switchgear 1 can be downsized and the degree of freedom in design can be improved, as in the case of the first embodiment.

Note that the positions of the plates 21 and 22 are not limited to the positions described in the second embodiment. It is sufficient if it is possible to provide the plates 21 and 22 on the inner wall surface of the expansion joint 20 so that they face each other, and the positions of the plates 21 and 22 are at the vertically lower part of the third component 25 or at the vertically lower part of the third component 25. It may be located at a position other than the top. Further, the number of plates provided inside the expansion pipe joint 20 is not limited to two, and may be any number. Furthermore, the plate material can have any shape.

According to the second embodiment, the gas insulated switchgear 1 has the plates 21 and 22 facing the inner wall surface of the expansion joint 20, and the adsorbent is arranged in the gap between the inner wall surface and the plates 21 and 22. This has the effect of making it possible to downsize.

The configurations shown in the embodiments above are examples of the contents of the present disclosure. The configuration of each embodiment can be combined with other known techniques. The configurations of each embodiment may be combined as appropriate. It is possible to omit or change a part of the configuration of each embodiment without departing from the gist of the present disclosure.

1 Gas-insulated switchgear, 2 Current-carrying conductor, 3, 4 Container, 5, 6 Insulating spacer, 7 Central shaft, 8 Case, 10, 20 Expansion pipe joint, 11, 21, 22 Plate material, 11a, 13, 14 Flange, 12 Expansion folds, 15, 16 tie rods, 21a, 22a ends, 23 first part, 24 second part, 25 third part.

Claims (4)

a current-carrying conductor;
an expansion pipe joint capable of expanding and contracting in the direction of a central axis of the current-carrying conductor, forming a sealed space in which the current-carrying conductor is accommodated, and filling the sealed space with an insulating gas;
a plate material provided inside the expansion pipe joint and facing an inner wall surface that is an inner side surface of the expansion pipe joint;
an adsorbent disposed in a gap between the inner wall surface and the plate material, which adsorbs moisture contained in the insulating gas ;
The expansion pipe joint is a bellows-shaped expansion pipe joint having a plurality of folds,
The plurality of folds include expansion folds that are expanded in the direction of the central axis compared to other folds among the plurality of folds,
A gas-insulated switchgear, characterized in that the adsorbent is placed inside the expansion folds . a current-carrying conductor;
an expansion pipe joint capable of expanding and contracting in the direction of a central axis of the current-carrying conductor, forming a sealed space in which the current-carrying conductor is accommodated, and filling the sealed space with an insulating gas;
a plate material provided inside the expansion pipe joint and facing an inner wall surface that is an inner side surface of the expansion pipe joint;
an adsorbent disposed in a gap between the inner wall surface and the plate material, which adsorbs moisture contained in the insulating gas;
The gas insulated switchgear is characterized in that the plate material is curved in an arc shape in a cross section perpendicular to the central axis. a current-carrying conductor;
an expansion pipe joint capable of expanding and contracting in the direction of a central axis of the current-carrying conductor, forming a sealed space in which the current-carrying conductor is accommodated, and filling the sealed space with an insulating gas;
a plate material provided inside the expansion pipe joint and facing an inner wall surface that is an inner side surface of the expansion pipe joint;
an adsorbent disposed in a gap between the inner wall surface and the plate material, which adsorbs moisture contained in the insulating gas;
The expansion pipe joint includes a cylindrical first part, a cylindrical second part, and a third part connected between the first part and the second part. and a slide-type expansion pipe joint in which at least one of sliding of the first part with respect to the third part and sliding of the second part with respect to the third part is possible,
The third part has a shape that projects further away from the central axis than the inside of the cylinder of the first part and the inside of the cylinder of the second part,
The gas insulated switchgear is characterized in that the adsorbent is placed in a portion of the third component that protrudes in a direction away from the central axis. 4. The gas insulated switchgear according to claim 3 , wherein the plate material is provided at a portion of the third component that protrudes in a direction away from the central axis.

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