JP2002325319A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent discharge inside an airtight container and also enhance the withstand voltage performance of a gas-insulated switchgear tank, achieving applicability to the rated voltage for the switchgear tank with its size being reduced or unchanged, as it is. SOLUTION: The gas-insulated switchgear is provided with a plurality of insulation barriers 11-14 made of an insulator between the airtight container 4 and its internal live part and between each live part. On the surface of these insulation barriers 11-14, platy insulators (i.e., gathers) 31-36 or step sections 90, 95 containing a barrier face for blocking discharge development along the surface are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear used in an electric power system or a distribution system, and more particularly to a box-type closed container type (cubicle type) gas insulated switchgear.

[0002]

2. Description of the Related Art FIG. 28 is a side sectional view showing a conventional gas insulated switchgear which is not known but has already been proposed.
9 is a cross-sectional view taken along line AA ′ in FIG. FIG.
In 8, 29, 1-3 are vacuum valves, 4 is a closed container, 5-7 are upper bushings, 8-10 are busbars,
14 is an insulating barrier (not shown in FIG. 28), 15 to 17 are lower bushings, 18 is a disconnector blade, 19 to 20 are insulating rods, 21 is an operating mechanism housing, and 22 to 23 are flexible conductors. Of these, the bus is a bus, upper bushing,
It consists of a flexible conductor, a vacuum valve, a disconnector blade, and a lower bushing, and these members are three-phase AC U, V, W
There are three each for each phase (all three are not shown). In some cases, only one of the vacuum valve and the disconnector blade is disposed inside the closed container 4.

The inside of the sealed container 4 is filled with an insulating gas under pressure. Further, the insulating barriers 11 to 14 are arranged between the phases (between electric paths of different phases) and between the ground (between the electric paths and the sealed container 4 at the ground potential). The inter-phase withstand voltage and the withstand voltage to the ground are improved by the pressurization and the installation of the insulating barrier, and the overall size of the sealed container 4 and, consequently, the opening / closing device can be reduced as compared with the case without these measures.

[0004] In addition, there is a prior art in which an insulating barrier is applied for the same purpose, Japanese Patent Laid-Open No. 2000-34186.
FIG. 30 shows a schematic structure of the main part. A thick insulating layer 126 is applied to the surfaces of the two opposing conductors 125, and an insulating barrier 127 is inserted between the conductors 125. By applying an insulating layer to the conductor surface and inserting a barrier,
The purpose is to improve the withstand voltage characteristics.

[0005]

In spite of such efforts, the demand for the reduction of the size of the switchgear has become stronger and stronger, while the shrinkage of the closed container 4 has been required.
There is also a demand that a switchgear having the same dimensions be used as a high rated voltage model without changing the internal configuration.

As a method of satisfying these requirements with a conventional switchgear, there is a method of increasing the filling pressure of the insulating gas inside the closed container. However, the inside of the sealed container 4 has an extremely uneven electric field distribution due to its complicated structure, and in this case, the withstand voltage generally does not increase so much even if pressure is applied. In addition, the pressurization causes problems such as insufficient strength of the sealed container 4 and insufficient strength of other components (not shown), and causes many development problems.

In the technique disclosed in Japanese Patent Application Laid-Open No. 2000-34186, a thick insulating layer must be provided on the surface of the conductor. , And a step of breaking the mold after heating and curing for a while is required, and the production cost and the production time are long.

Here, when observing a discharge path in a conventional model or in a gap having a simple shape in which a barrier is arranged between a high-voltage conductor and a ground conductor, the presence or absence of contact between the high-voltage conductor and the insulation barrier, and the contact between the ground conductor and the insulation barrier are observed. Although the details differ depending on the presence or absence of a discharge path, it has been clarified that a discharge path develops and discharges on the insulating barrier surface in common under any experimental conditions. Although the discharge progress path has been clarified in this way, there is no special device for preventing the discharge progress in the conventional model. As a result, the withstand voltage performance cannot be improved to a level higher than the current level, and as a result, there has been a problem that the size of the device has not been reduced or the application to the high rated voltage of the current model has not progressed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a barrier surface such as a fold or a step of an insulator on the surface of an insulating barrier, its height, width, and location. The purpose is to increase the withstand voltage increasing effect of the barrier.

[0010]

According to the present invention, the means for solving the above problems are as follows. (1) A gas insulated switchgear extends through a sealed container, an insulating gas sealed in the sealed container, a vacuum valve provided in the sealed container, and the sealed container, and connects to the vacuum valve. Three-phase electric circuit having each of the conductors provided, an insulating barrier provided between the sealed container and the electric circuit and between the electric circuits to insulate between the electric circuits, and provided on the insulating barrier, And a barrier surface for preventing the progress of discharge along the surface of the insulating barrier.

(2) The insulating gas is 0.1% at 20 ° C.
It may be sealed at a pressure of 1 MPa or more.

(3) The barrier surface may be a rising wall surface of a plate-like fold rising from the surface of the insulating barrier.

(4) The barrier surface is a rising wall surface of at least one step provided on one side of the surface of the insulating barrier, and the electric path is located substantially in a space on a lower surface of the step. The gas insulated switchgear according to claim 1 or 2, wherein

(5) The barrier surface of the insulating barrier inserted between the electric circuit and the metal hermetic container may be provided only on the surface facing the electric circuit among the front and back surfaces of the insulating barrier.

(6) The surface of the insulating barrier inserted between the electric circuit and the metal sealed container is the front and back of the insulating barrier.
It may be provided on both of the surfaces.

(7) The barrier surface on the surface of the insulating barrier inserted between the two different-phase electric paths is provided on both surfaces of the insulating barrier.

(8) The position of the barrier surface on the surface of the insulating barrier is determined by drawing a virtual shortest line connecting the two conductors facing each other with the insulating barrier interposed therebetween and measuring the point where the virtual shortest line passes through the insulating barrier. Alternatively, at least a distance corresponding to a length from the conductor tip to the barrier surface in the virtual shortest line may be secured.

(9) A barrier surface on the insulating barrier surface may be provided so as to surround the opposing electric path.

(10) The number of pleats provided on one side of the insulating barrier is two or more, and the shortest interval is 10 mm.
It may be the above.

(11) The rising angle of the barrier surface provided on the insulating barrier surface from the insulating barrier substrate surface may not be 90 degrees, or the barrier surface may rise while being curved.

(12) The number of insulating barriers inserted between the electric circuit and the exposed portion of the conductor of the sealed container and between the different-phase charging paths is plural, and at least one of the insulating barriers is provided in at least one of the insulating barriers. A gas insulated switchgear provided with the barrier surface according to any one of the above.

(13) The height of the barrier surface provided on the insulating barrier surface from the insulating barrier substrate is preferably 5 mm or more.

(14) It is preferable that the barrier surface is the surface of the fold, and the width of the contact portion of the fold or the protrusion with the insulating barrier substrate surface in the thin direction is at least 5 mm.

(15) It is preferable that the tip of the insulating barrier, the folds provided on the surface thereof, and the tip of the step portion do not contact the electric path.

(16) The fold or step and the insulating barrier may be joined by a method such as adhesion or fitting.

(17) The fold or step and the insulating barrier may be integrally formed.

(18) The insulating gas is pure SF6 gas, SF
It may be any of a mixed gas of 6 gases and nitrogen, a dry air having a moisture content of 3000 SF or less, a mixed gas of nitrogen and oxygen, or a pure nitrogen gas.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a view for explaining a gas insulated switchgear according to a first embodiment for carrying out the present invention. FIG. 2 is an overall sectional view of the gas insulated switchgear according to the present invention as viewed from the side, and FIG.
FIG. 3 is a sectional view taken along line AA of FIG. 2.

In FIG. 1, 1-3 are vacuum valves, 4 is a closed container, 5-7 are upper bushings, 8-10 are busbars,
11 to 14 are insulating barriers, 15 to 17 are lower bushings, 18 is disconnector blades, 19 to 20 are insulating rods,
21 is an operation mechanism housing, and 22 to 23 are flexible conductors. Reference numeral 30 denotes folds that are provided on the surfaces of the insulating barriers 11 to 14 and rise from the surface and are plate-shaped insulators. The surface of such a plate-shaped insulator serves as barrier surfaces 31 to 36 for preventing the progress of discharge occurring along the surface of the insulating barrier. In FIG. 2, reference numeral 24 denotes an upper disconnector blade, 25 denotes a busbar bushing, and 26 denotes an upper disconnector operation mechanism housing.

In such a gas insulated switchgear, the sealed container 4 is made of metal, has sufficient strength, and has a potential of the ground potential. The electric circuit 29 of each phase includes a busbar bushing 25, an upper disconnector blade 24, an upper bushing 6, a flexible conductor 2
2, 23, vacuum valves 2 and 3, disconnector blade 18, and lower bushing 16, and the number of electric circuits 29 is three corresponding to three-phase alternating current. (All three are not shown). For shutting off short-circuit current and load current, vacuum valves 1-3
The opening and closing of the electric circuit is performed by the disconnector blade 18 and the upper disconnector blade 24. Further, the inside of the closed container 4 is preferably at least 0.11 MPa at 20 ° C., more preferably 0.14 MPa.
An insulating gas pressurized to not less than MPa is filled. The insulating barriers 11 to 14 and the plate-shaped insulator or the fold 30 are not in contact with the electric circuit 29 but are arranged at a certain distance.

In such a gas insulated switchgear, electrical insulation is required between the phases, that is, between the electric paths 29 having different phases, and between the ground, that is, between the electric path 29 and the sealed container 4. A major feature of the present invention in the first embodiment is that the folds 30 having barrier surfaces 31 to 36 are provided on the surfaces of the insulating barriers 11 to 14 installed at locations where these insulation is required.
Is provided.

Hereinafter, the effect of the provision of the barrier surfaces 31 to 36 will be specifically described. FIG. 3 shows a gap configuration in which a bar electrode is arranged in contact with the surface of an insulator, and a ground electrode is arranged on the lower end and the back surface of the insulator. It is the result of measuring the breakdown voltage between the ground electrodes). The barrier surfaces 31 to 36 are provided on the surface on which the high-voltage electrodes are arranged, and the height of the barrier surfaces 31 to 36 is 5 mm. The horizontal axis in the figure is the air filling pressure, and the vertical axis is 0.1M.
The breakdown voltage of Pa was expressed as a standardized value as 1.0.

FIG. 3 shows that the breakdown voltage between the gaps is clearly higher when the air pressure exceeds about 0.13 MPa than when no folds are formed when the folds are applied. The reason is as follows. When a discharge occurs on the surface of an insulator, a conductive path called a streamer immediately advances immediately before the surface of the insulator, causing a subsequent main discharge.However, it is difficult for the streamer to advance due to the physical barrier effect of the pleats. Become. Because the streamer is formed of plasma and ions, the stagnation of the streamer in the vicinity of the folds causes the accumulation of space charges and the relaxation of the electric field, which requires a higher voltage for the streamer to propagate beyond the barrier surface . Such an effect of the barrier surface is particularly remarkable in the case of the gap shape between the high-voltage electrode and the ground electrode in which the streamer extends on the surface of the insulator as described above. The present embodiment utilizes this effect.

Here, in order to supplement the details of the gas insulated switchgear of the present embodiment, the shape of the pleats intended in the present embodiment will be specifically described. FIG. 4 shows the result of comparing the height of the fold with the case of 5 mm in FIG. 3 and the height of 10 mm.
The breakdown voltage at 10 mm is higher than at 5 mm,
Although the effect of the height of the pleats appears, the degree of increase in the breakdown voltage with respect to the case without the pleats in FIG. 3 is slightly better than 5 mm. From this, the height of the fold is 5m
m or more. This is the reason for the claim relating to the pleat height according to claim 11. Further, if the width of the fold is extremely thin, the discharge may penetrate through the fold in some cases, so that at least 5 mm is necessary. This is the reason for claiming the width in claim 12.

Based on the above, the shapes of the folds whose breakdown voltage is improved by the application are shown in FIGS. FIG. 5 shows a basic shape, in which folds 82 are formed on the surface of an insulating barrier substrate 81.
FIG. 4 is a cross-sectional view of a state in which symbols are provided. The height of the fold described in FIG. 3, FIG. 4, and claim 11 corresponds to H in FIG.
Is equivalent to The width W in FIG. 5 is the width of the fold described above, which is the length of the contact surface of the fold 82 with the insulating barrier substrate 81 in a substantially thin direction. The pleats shown in FIGS. 6 to 8 are applied shapes shown in FIG. 5, and the tips and side surfaces of the pleats are rounded.

In addition to forming the folds 30 to provide the barrier surfaces 31 to 36 according to the present invention, a method for obtaining the same effect is to form a barrier surface 91 with a step 90. FIG. 9 shows a main structure of an application example. The effect of preventing the streamer from propagating in the right-hand direction of the paper is the same as that of the above-described folds. If the direction of discharge progress is known, the provision of the step 90 can improve the breakdown voltage. This corresponds to the claims described in claim 2. The height H of the step shown in the figure is preferably 5 mm or more, as described in FIG.

As described above, the barrier surface 31 provided to the insulating barrier
Although the shapes of the folds 30 and the steps 90 have been described as 36 to 91 or 91, the arrangement positions of the folds and steps on the insulating barrier surface in the gas insulated switchgear of this embodiment will be further described. FIG. 10 shows an excerpted view of the insulation structure of the gas insulated switchgear of FIG. In the figure, an insulation barrier 93 is provided between the electric circuit 91 and the electric circuit 92.
Are inserted to improve the withstand voltage between electric paths, but in order to further improve the withstand voltage, folds 94 are provided on both surfaces of the insulating barrier 93. FIG. 11 is a diagram of FIG. 10 viewed from an oblique direction, and the folds 94 are linear in this example. The structure in which the fluted insulation barrier is inserted between the electric lines is adopted between the different-phase electric lines in the sealed container 4 of the gas insulated switchgear according to the present embodiment in FIG. This is an example of the expression. In FIG. 10, the discharge path in the case of a flat insulating barrier having no fold 94 passes through the gas space from the high-voltage conductor to the surface of the insulating barrier 93, and then from the surface of the insulating barrier 93 on the high-voltage conductor side to the low-voltage conductor side. It extends on the surface so as to go around the surface, and finally extends from the insulating barrier 93 to the gas space between the low-voltage conductors. That is, since the discharge progresses on the surface of the insulating barrier, the rupture can increase the breakdown voltage between the conductors.

Here, in the arrangement relationship between the electric path and the insulating barrier as shown in FIG. 10, the effect of the fold varies depending on the position where the fold is provided. In FIG. 10, a virtual shortest line connecting the electric circuit 91 and the electric circuit 92 is drawn, and the distance between the insulating barrier 93 and the electric circuit 91 along the straight line is represented by a, and the distance from the straight line to the inside of the fold 94 is represented by b. If the distance b becomes too small with respect to the distance a, space discharge from the high-voltage conductor occurs between the high-voltage conductor and the insulating barrier surface outside the pleats 94, and the effect of placing the pleats 94 is reduced. If the relationship of distance b> distance a is established, the effect of setting the fold 94 can be secured. This is the reason for claiming claim 6.

Here, the relationship of distance b> distance a is as follows:
This is true even in the case where the low-voltage electrode side is not a circuit as shown in FIG. Therefore, the above-mentioned magnitude relationship may be applied not only between the electric paths but also as a fold-providing condition in the insulating barrier inserted between the electric path and the closed container.

FIG. 12 shows an application example in which a step portion 95 having a barrier surface instead of a fold is provided on the surface of the insulating barrier 93. In the case of this gap configuration, the same effect as the fold can be obtained even with the step. As described above. Also in this case, if the relationship of distance b> distance a (not shown) is established, the effect of setting the step can be ensured. Further, this magnitude relationship may be used as a pleating condition not only between electric circuits but also at an insulating barrier inserted between the electric circuit and the sealed container.

FIG. 13 is a view showing a case where the folds 94 are not straight but curved, but also in this case, the fold-providing effect appears. Although not shown here, the conductor disposed on the back side of the insulating barrier 93 in FIG.
It may be an electric circuit having the same shape as 1 or a closed container 4. Since the gas insulated switchgear according to the present embodiment is designed to be very compact, linear folds and steps are not necessarily provided due to dimensional restrictions. You may proceed. The non-linear folds and steps may be installed not only between the electric paths but also on an insulating barrier inserted between the electric paths and the sealed container. When adopting non-linear folds or steps, folds,
In any position of the step, the installation effect can be ensured if the relationship of distance b> distance a (not shown) is established.

FIGS. 14 and 15 show an application example in which a fold 94 provided on the insulating barrier surface and having a barrier surface is arranged so as to surround the electric path 91. Here, FIG. 14 is a diagram showing a BB ′ section in FIG.
It is difficult for an actual gas insulated switchgear to grasp which part of the insulation barrier surface is discharged to the other out-of-phase electric circuit. Therefore, if the folds are arranged so as to surround the electric path, it is possible to prevent the discharge path from developing in any direction. The method of providing the pleats is included in the scope of claim 7.

The method of applying the folds may be provided not only between the electric paths but also on an insulating barrier inserted between the electric paths and the sealed container. Also, a step may be used instead of the fold, but in that case, the height of the step is provided so that the side substantially opposite to the electric path is the lower side of the step. Also in these cases, if the relationship of distance b> distance a (not shown) is established, the installation effect can be easily exerted.

FIG. 16 shows an insulating barrier 93 between different-phase electric circuits.
In the application example in which two sheets are inserted, a fold 94 is provided only on the surface of the insulating barrier 93 on the left side of the drawing and facing the electric path 91. In this case, when the electric circuit 91 is a high-voltage conductor, the effect of providing a fold is exhibited. Although not shown,
In order to exhibit the effect of forming the folds regardless of which of the electric circuits 91 and 92 becomes the high-voltage conductor, the folds 94 may be formed on both insulating barriers on the surface facing the electric circuit. Even when such a plurality of insulating barriers are arranged between the gaps, the effect of increasing the breakdown voltage between the electric paths 91 and 92 due to the application of the folds is recognized. This is an example of the scope claimed in claim 10. The method of applying the folds at the place where two or more insulating barriers are arranged may be applied not only between the electric paths but also to the insulating barrier inserted between the electric paths and the closed container.

Next, the pleats when the pleats are applied to the insulating barrier disposed between the electric circuit and the wall surface of the closed vessel (ground potential),
A method of providing a step will be described with reference to the drawings. FIG.
Is an essential part structure shown in FIG. 1, in which an insulating barrier 93 is inserted between the electric path 91 and the wall surface 96 of the closed container, and a fold 94 is provided only on the electric path 91 side of the surface. The reason that the folds 94 are provided only on the electric path 91 side of the insulating barrier 93 is that the streamer described above does not propagate from the closed container wall surface 96 side,
This is because even if the folds are provided on the same side, there is not much effect of preventing the progress of discharge. This is the reason for claim 3.

On the other hand, FIG. 18 shows an embodiment in which the folds 94 are also provided on the closed container wall surface 96 side, and the pleated barrier inserted between the electric lines described with reference to FIG. You may divert to. Even if the folds are provided on the closed container wall surface 96 side, there is not much effect of preventing the progress of discharge. However, the use of the folds for use between the electric paths can reduce the manufacturing cost of the entire foldable insulation barrier. This is claim 4
This is the reason for charging.

FIGS. 19 and 20 show the same concept applied to a step instead of a fold. In FIG. 19, a step 95 is provided only on the electric circuit 91 side for the same reason as in FIG. FIG. 20 shows a case in which the stepped insulating barrier inserted between the electric paths in FIG. 12 is used for the same reason as in FIG. Even if these are adopted, the same effect can be obtained. Folds and steps on the surface of the insulating barrier inserted between the electric circuit and the closed container may have the following features. That is, (1) the aforementioned distance b at the step applying position
Three points: (1) the relationship of the distance a (not shown) is satisfied, (2) the step is non-linear, and (3) the step is arranged so as to surround the entire circumference of the electric circuit by the step. And these effects are as described above.

Here, it is preferable that the tips of the above-mentioned folds and steps are not in contact with the electric circuit. This is because, when contact occurs, corona discharge is likely to occur at the contact portion, and there is a possibility that corona discharge deterioration of insulating barriers, folds, and steps may progress. This is the reason for claiming claim 13.

The gas insulated switchgear according to the first embodiment of the present invention has been described in detail with reference to the schematic structural diagrams. Next, a description will be given of which parts of the gas insulated switchgear shown in FIG. The folds 31 are generated starting from a high electric field portion at the end of the vacuum valve 1.
Has an effect of preventing discharge toward the upper surface of the sealed container 4 by extending the surface facing upward in the drawing.

The barrier surface of the fold 32 is generated starting from the high electric field portion at the end of the vacuum valve 1, and extends upward from the surface of the insulating barrier 12 facing the vacuum valve 1 to the upper surface of the closed container 4. This has the effect of preventing discharge toward. Further, a high electric field generated at the end of the vacuum valve 1 is generated as a starting point, and the surface of the insulating barrier 12 facing the vacuum valve 1 extends upward in the drawing. Wrap, vacuum valve 3 or its component 3
It also has the effect of preventing discharge from developing toward a. In addition, it is generated from the high electric field portion at the end of the vacuum valve 3 as a starting point, propagates the surface of the insulating barrier 12 facing the vacuum valve 3 upward in the drawing, and wraps around the upper surface of the insulating barrier 12 toward the surface facing the vacuum valve 1. , Vacuum valve 1 or its constituent members 1a
It also has the effect of preventing the discharge from proceeding toward.

The barrier surface of the pleat 33 is generated starting from the high electric field portion at the end of the vacuum valve 3, and the surface of the insulating barrier 12 facing the vacuum valve 3 extends downward in the drawing. This has the effect of preventing discharge toward the part. Further, a high electric field portion at the end of the vacuum valve 1 is generated as a starting point, and the surface of the insulating barrier 12 facing the vacuum valve 1 extends downward in the drawing. Wrap, vacuum valve 3 or its component 3
It also has the effect of preventing discharge from developing toward a. In addition, it is generated from the high electric field portion at the end of the vacuum valve 3 as a starting point, extends on the surface of the insulating barrier 12 facing the vacuum valve 3 toward the lower side in the drawing, and the lower end of the insulating barrier 12 faces the vacuum valve 1 There is also an effect of preventing discharge from flowing around the surface and developing toward the vacuum bulb 1 or its component 1a.

The barrier surface of the fold 34 is generated starting from the high electric field portion at the end of the vacuum valve 3, and the surface of the insulating barrier 13 facing the vacuum valve 3 extends downward in the drawing. This has the effect of preventing discharge from developing toward the part. Further, a high electric field generated at the end of the vacuum valve 3 is generated as a starting point, and the surface of the insulating barrier 13 facing the vacuum valve 3 extends downward in the drawing. There is also an effect of preventing discharge from flowing around and developing toward the vacuum bulb 2 or its component 2a. Further, the high electric field generated at the end of the vacuum valve 2 is generated as a starting point, the surface of the insulating barrier 13 facing the vacuum valve 2 extends downward in the drawing, and the lower end of the insulating barrier 13 faces the vacuum valve 3. There is also an effect of preventing discharge from flowing around the surface and developing toward the vacuum bulb 3 or its component 3a.

The barrier surface of the pleat 35 is generated starting from the high electric field portion at the end of the vacuum valve 2, and extends upward from the surface of the insulating barrier 13 facing the vacuum valve 2 to the upper surface of the closed container 4. This has the effect of preventing discharge toward. Further, the high electric field portion at the end of the vacuum valve 2 is generated as a starting point, and the surface of the insulating barrier 13 facing the vacuum valve 2 extends upward in the drawing. , Vacuum valve 2 or its constituent members 2
It also has the effect of preventing discharge from developing toward a. The high electric field at the end of the vacuum valve 2 is generated as a starting point, and the surface of the insulating barrier 13 facing the vacuum valve 2 extends upward in the drawing. To prevent the electric discharge from flowing toward the vacuum valve 2 or its component 2a.

The barrier surface of the fold 36 is generated starting from the high electric field portion at the end of the vacuum valve 2, and extends upward from the surface of the insulating barrier 14 facing the vacuum valve 2 to the upper surface of the closed container 4. This has the effect of preventing discharge toward.

By providing the pleats 31 to 36 having a barrier surface at various places of the insulating barriers 11 to 14 as described above,
The discharge progress in the above discharge paths is prevented, and the discharge voltage in each path is increased. As a result, the discharge voltage of the entire inside of the sealed container 4 increases, and the withstand voltage performance of the entire device is improved. As a result, the withstand voltage standard can be satisfied without increasing the gas pressure inside the sealed container 4. Further, the switchgear according to the present invention can be used at a rated voltage one class higher without increasing the size of the sealed container 4.

Here, in FIG. 1, the vacuum valves 1 to 3 and the disconnector blade 18 are arranged inside the closed vessel 4, but only one of the vacuum valve and the disconnector is placed inside the closed vessel 4. The effect of the same invention can be obtained even with a model that has been used. Further, there is an opening / closing device in which not only a vacuum valve and a disconnector but also a grounding switch is provided in the closed container 4, but the same effect of the invention can be obtained in this case. Further, in FIG. 1, the vacuum valves 1 to 3 are arranged in a triangular shape in FIG. 1, but the same invention is applied to an arrangement other than the triangular shape, for example, when three vacuum valves are arranged on a plane. The effect can be obtained. Also, the electric circuit surface and the insulating barrier 11
14 to 14 and the pleats 31 to 36 are in contact with each other, there is a possibility that a high electric field portion may be generated in the contact portion. However, if they are separated as in the present embodiment, it is possible to prevent discharge caused by the contact. effective.

Further, the kind of gas to be pressurized and sealed at 0.10 MPa or more at 20 ° C. in the closed container 4 is pure S
F6 gas, mixed gas of SF6 gas and nitrogen, water content 300
The above effects can be obtained with any of dry air of 0 SF or less, a mixed gas of nitrogen and oxygen, and pure nitrogen gas. By using any of these, good withstand voltage performance can be obtained even with simple gas handling.

Further, the insulating barriers 11 to 14 and the pleats 31 to 36 may be manufactured by individually manufacturing and then joining them by a technique such as adhesion or fitting. Alternatively, it may be manufactured in advance using a mold that can be integrally molded. When the folds and the insulating barrier are joined by a method such as bonding or fitting, there is a feature that a fold having a complicated shape can be easily manufactured. On the other hand, when the folds and the insulating barrier are integrally formed, there is no fear of the folds falling off.

Embodiment 2 FIG. 21 is a view for explaining a gas insulated switchgear according to a second embodiment for carrying out the present invention. In the second embodiment, in addition to the folds 31 to 36 described in the first embodiment, folds 37 to 44 are also provided on the surfaces of the insulating barriers 11 to 14. That is, a feature of the second embodiment of the present invention is that two or more folds are provided on one side of each insulating barrier. Hereinafter, Embodiment 2
The effect of the invention will be described.

FIG. 22 shows a fold 82 of the basic shape shown in FIG.
Is a cross-sectional view of a state where two are arranged at an interval L. FIG. Since the effect of preventing the progress of the streamer appears in each fold, the breakdown voltage increases as the number of folds increases. Here, when the interval L is set to 10 mm or less, the fold 8
The streamer jumps between the two and the effect of multiple installations diminishes. Therefore, the interval L needs to be at least 10 mm. This is the reason for claim 8.

For the above reasons, by providing two or more folds on one side of the insulating barrier, the discharge path must overcome two or more folds for the discharge to develop. Naturally, the development of discharge on the insulating barrier surface becomes more difficult than in the case where only one pleat is provided, and the discharge voltage is also improved. As a result, the discharge voltage of the entire inside of the sealed container 4 is significantly increased, and the withstand voltage performance of the entire device is improved. As a result, the withstand voltage standard can be satisfied without increasing the gas pressure inside the sealed container 4. In addition, the 0 switchgear of the present invention can be used at a rated voltage one class higher without increasing the size of the sealed container 4.

Here, the shape of each fold is a shape in which the tip of the fold is angular in FIG. 22, but may be a shape in which the tip is rounded as shown in FIGS. In this case, it suffices that the shortest distance between the positions where the folds rise from the insulating substrate surface is 10 mm or more. The shape of the pleats in the longitudinal direction may be not only a straight line but also a curved shape or a part of an arc. Further, the pleats may be provided in a double manner so as to surround the entire periphery of the tip of the opposing high-voltage conductor.

Here, similarly to the first embodiment, when only one of the vacuum valve and the disconnector is disposed inside the sealed container 4, or in addition to the vacuum valve and the disconnector, a grounding switch is also provided. The same effect of the invention can be obtained also in the opening / closing device that is used. Further, even when the vacuum valves are arranged, for example, when three vacuum valves are arranged on a plane, the same advantageous effects can be obtained. Further, the insulation barriers 11 to 14 and the folds 31 to 44 are arranged at a certain distance from the electric path. When they are in contact with the electric circuit surface, a high electric field part is generated at the contact part and there is a risk of corona discharge.However, if they are separated and arranged as in the present embodiment, it is possible to prevent discharge caused by contact. effective.

Further, the type of gas pressurized and sealed at 0.10 MPa or more at 20 ° C. in the closed container 4 is pure S
F6 gas, mixed gas of SF6 gas and nitrogen, water content 300
The above effects can be obtained with any of dry air of 0 SF or less, a mixed gas of nitrogen and oxygen, and pure nitrogen gas. By using any of these, good withstand voltage performance can be obtained by simple gas handling.

Further, the insulating barriers 11 to 14 and the pleats 31 to 36 may be manufactured by individually manufacturing and then bonding them by a technique such as adhesion or fitting. Alternatively, it may be manufactured in advance using a mold that can be integrally molded. When the folds and the insulating barrier are joined by a method such as bonding or fitting, there is a feature that a fold having a complicated shape can be easily manufactured. On the other hand, when the folds and the insulating barrier are integrally formed, there is no fear of the folds falling off.

Embodiment 3 FIG. 23 is a view for explaining a gas-insulated switchgear according to Embodiment 3 for carrying out the present invention. In FIG. 23, the insulating barriers 11 to 14
Are provided with folds 61 to 66 on each surface, and each fold is characterized in that the angle formed by the center axis of the fold and the surface of the insulating barrier substrate is not 90 degrees.

Hereinafter, the effects of the invention in the third embodiment will be described. FIG. 24 is a structural view of a main part of the present embodiment, which has a unique fold shape provided on the insulating barrier surface. This figure is characterized in that the cross-sectional shape of the one-way inclined pleat 83 is inclined in the right-hand direction on the paper surface, which is one of the claims in claim 9. In this configuration, when the streamer advances from the right hand side of the paper, the streamer advances to the vicinity of the contact portion between the one-way inclined pleat 83 and the insulating barrier substrate 81, then changes the direction of propagation at an acute angle to get over the pleats, and Must progress to At this time, space charges easily accumulate in the substantially acute angle space of the contact portion between the one-way inclined pleats 83 and the insulating barrier substrate 81, and the accumulation state exceeds that of the basic shape in FIG. For this reason, the electric field intensity in the vicinity of the substantially acute angle space is reduced, the progress of the discharge is hindered, and the breakdown voltage is increased as compared with the case of the basic shape in FIG.

FIG. 25 shows a shape in which the same effect as in FIG. FIG. 26 shows FIG.
The shape of the corner of the one-way inclined pleat 83 is rounded.
The height of the pleats claimed in claim 11 is indicated by H in FIG. The effect is the same as the shape of FIG. FIG. 27 shows a shape in which the same effect as in FIG. These shapes in FIGS. 25 to 27 are also one of the claims in claim 9. The same effect can be obtained by using these rounded folds.

When a step is used instead of a fold
24 (not shown), the same effect as described above can be obtained even when the rising angle of the step is other than 90 degrees, and as in the case of FIG. 24, the ability of the streamer to prevent the growth is increased, and the breakdown voltage is increased.

As can be seen from the above description, in the case of a discharge that develops from the side where the angle between the center axis of the fold and the surface of the insulating barrier substrate is smaller than 90 degrees (the acute angle side), the tip of the discharge path is the insulating barrier. The confinement effect that penetrates the sharp corners formed by the folds and makes it difficult to escape easily from the sharp corners appears. As a result, the effect of preventing the discharge from propagating to the opposite side (the obtuse angle side) is enhanced. For example, regarding the fold 61 in FIG. 23, the insulating barrier 1 starts from the end of the vacuum valve 1.
The effect of preventing the discharge from developing on the surface of FIG.

Accordingly, when the starting point and the terminating point of the discharge are known, the rupture voltage can be greatly increased by installing the folds obliquely with respect to the surface of the insulating barrier substrate so that the starting point of the discharge is on the acute angle side. As a result, the discharge voltage of the entire inside of the sealed container 4 is significantly increased, and the withstand voltage performance of the entire device is improved. As a result, the withstand voltage standard can be satisfied without increasing the gas pressure inside the sealed container 4. In addition, the switchgear can be used at a rated voltage one class higher without increasing the size of the sealed container 4.

Here, similarly to the first embodiment, when only one of the vacuum valve and the disconnector is disposed inside the sealed container 4, or in addition to the vacuum valve and the disconnector, a ground switch is also provided. The same effect of the invention can be obtained also in the opening / closing device that is used. Further, even when the vacuum valves are arranged, for example, when three vacuum valves are arranged on a plane, the same advantageous effects can be obtained. Also, the insulation barriers 11 to 14 and the folds 61 to 66 are arranged at a certain distance from the electric path. When there is a contact between the surface of the electric circuit and these, there is a possibility that a high electric field portion is generated at the contact portion. However, if they are separated as in the present embodiment, there is an effect that a discharge caused by the contact can be prevented.

Further, the type of gas pressurized and sealed at 0.10 MPa or more at 20 ° C. in the closed container 4 is pure S
F6 gas, mixed gas of SF6 gas and nitrogen, water content 300
The above effects can be obtained with any of dry air of 0 SF or less, a mixed gas of nitrogen and oxygen, and pure nitrogen gas. By using any of these, good withstand voltage performance can be obtained by simple gas handling.

Further, the insulating barriers 11 to 14 and the folds 61 to 66 may be manufactured by individually manufacturing and then bonding them by a technique such as adhesion or fitting. Alternatively, it may be manufactured in advance using a mold that can be integrally molded. When the folds and the insulating barrier are joined by a method such as bonding or fitting, there is a feature that a fold having a complicated shape can be easily manufactured. On the other hand, when the folds and the insulating barrier are integrally formed, there is no fear of the folds falling off.

[0075]

(1) According to the gas insulated switchgear of the present invention, the sealed container in which the insulating gas is sealed, the insulating gas sealed in the sealed container, and the vacuum provided in the sealed container. A three-phase circuit having a conductor extending through the valve and the sealed container and connected to the vacuum valve, and a three-phase circuit provided between the sealed container and the circuit and between the circuits. An insulating barrier that insulates between the insulating barrier and a barrier surface that is provided on the insulating barrier and that prevents the progress of discharge along the surface of the insulating barrier; This has the effect of increasing the discharge voltage through the barrier surface.

(2) When the insulating gas is used at 20.degree.
Since the gas insulated switchgear is sealed at a pressure of 11 MPa or more, the insulation of the gas insulated switchgear becomes more reliable and the device can be downsized.

(3) Further, since the barrier surface is a rising wall surface of a plate-like fold rising from the surface of the insulating barrier, the structure is simple and a reliable effect can be obtained.

(4) Further, since a step is provided instead of the fold in claim 3, the same effect as that of the fold can be obtained.

(5) Also, the barrier surface of the insulating barrier surface inserted between the electric circuit and the metal hermetic container is provided only on the surface facing the electric circuit among the front and back surfaces of the insulating barrier. In the discharge between the electric circuit and the metal sealed container, the barrier surface on the surface facing the electric circuit is effective in preventing the discharge from developing.
As a result, the insulating barrier member originally used between the electric circuits is
It can be applied between the electric circuit and the metal closed container,
There is an effect that cost reduction due to a decrease in the number of parts can be expected.

(6) Further, the barrier surface of the insulating barrier surface inserted between the electric circuit and the metal hermetic container is provided on both of the front and back surfaces of the insulating barrier. As a result, the insulating barrier member originally used between the electric paths can be applied between the electric path and the metal hermetic container, and the effect of reducing costs due to the reduction in the number of parts can be expected.

(7) In addition, since the barrier surfaces on the surface of the insulating barrier inserted between the two different-phase electric circuits are provided on both surfaces of the insulating barrier, the discharge generated from the electric circuit on either of the opposing surfaces is prevented. This also has the effect of improving the breakdown voltage.

(8) The position of the barrier surface on the insulating barrier surface is determined by drawing a virtual shortest line connecting the two conductors facing each other with the insulating barrier interposed therebetween and measuring the point where the virtual shortest line passes through the insulating barrier. By securing at least the distance corresponding to the length from the conductor tip to the barrier surface in the virtual shortest line, there is an effect that the discharge progress inhibiting ability is kept high.

(9) By providing a fold or a step on the surface of the insulating barrier so as to surround the opposing electric circuit, the discharge can be prevented in any direction regardless of the direction of the discharge, and the breakdown voltage can be improved. There is.

(10) The number of folds provided on one side of the insulating barrier is two or more, and the shortest interval is 10 mm.
The above spacing has the effect of increasing the withstand voltage performance as compared to the case where only one pleat is provided.

(11) The rising angle of the barrier surface provided on the insulating barrier surface from the insulating barrier substrate surface is not 90 degrees, or the barrier surface rises while being curved.
In particular, there is an effect of increasing the ability to prevent discharge progress from the side where the angle becomes acute, and the breakdown voltage can be effectively increased under the condition that the discharge progresses from a specific direction.

(12) The number of insulating barriers inserted between the electric circuit and the exposed portion of the conductor of the sealed container and between the different-phase charging paths is plural, and at least one of the insulating barriers is included in at least one of the insulating barriers. Since the barrier surface described in any one of (1) to (7) is provided, the same effect as in claims 1 to 9 can be obtained.

(13) By setting the height of the barrier surface provided on the insulating barrier surface from the insulating barrier substrate to 5 mm or more, there is an effect that the rate of increase of the discharge voltage is maintained at a high value.

(14) Since the barrier surface is the surface of the fold, and the width of the contact portion between the insulating barrier substrate surface and the fold or the convex portion in the thin direction is at least 5 mm, the insulation which penetrates the bottom of the fold is provided. Destruction can be prevented.

(15) By preventing the tip of the insulating barrier, the tip of the fold imparted to the surface thereof, and the tip of the stepped portion from contacting the electric circuit, the corona generated at the time of contact starting from the high electric field portion of the contact portion There is an effect that discharge and dielectric breakdown can be prevented.

(16) Since the folds or steps and the insulating barrier are joined by a method such as bonding or fitting, there is an effect that folds having complicated shapes can be easily manufactured.

(17) By forming the folds or steps and the insulating barrier integrally, there is an effect that there is no fear of the folds falling off.

(18) The insulating gas is pure SF6 gas, SF
6 By using any one of the mixed gas of gas and nitrogen, the dry air with the moisture content of 3000 ppm or less, the mixed gas of nitrogen and oxygen, and the pure nitrogen gas, a better breakdown voltage can be obtained as compared with the case of using other gases. This has the effect that it can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a gas insulated switchgear according to a first embodiment, taken along line AA ′ of FIG.

FIG. 2 is a side view of the gas insulated switchgear according to the first embodiment.

FIG. 3 is an auxiliary diagram for illustrating effects of the first embodiment. FIG. 14 is an auxiliary diagram for illustrating a basic effect of the second and third embodiments.

FIG. 4 is an auxiliary diagram for illustrating an effect of the first embodiment. FIG. 14 is an auxiliary diagram for illustrating a basic effect of the second and third embodiments.

FIG. 5 is a view showing a part of the gas insulated switchgear according to the first embodiment and is a view for explaining a shape of a fold according to the present invention.

FIG. 6 is a view showing a part of the gas insulated switchgear according to the first embodiment and is a view for explaining a shape of a fold according to the present invention.

FIG. 7 is a diagram illustrating a part of the gas insulated switchgear according to the first embodiment, and is a diagram for describing a shape of a fold according to the present invention.

FIG. 8 is a view showing a part of the gas insulated switchgear according to the first embodiment and is a view for explaining the shape of the fold according to the present invention.

FIG. 9 is a diagram illustrating a part of the gas insulated switchgear according to the first embodiment and is a diagram for explaining a shape of a step according to the present invention.

FIG. 10 is a diagram showing a part of the gas insulated switchgear according to the first embodiment, showing an aspect of an insulating barrier inserted between different-phase electric circuits.

11 is a view showing a part of the gas insulated switchgear according to the first embodiment, and is a view from an oblique direction in FIG.

FIG. 12 is a diagram illustrating a part of the gas insulated switchgear according to the first embodiment, illustrating an aspect of an insulation barrier inserted between different-phase electric circuits.

FIG. 13 is a diagram showing a part of the gas insulated switchgear according to the first embodiment, showing an aspect of an insulating barrier inserted between different-phase electric circuits and between the electric circuit and the wall surface of the closed vessel.

FIG. 14 is a diagram illustrating a part of the gas insulated switchgear according to the first embodiment, illustrating an aspect of an insulation barrier inserted between different-phase electric circuits.

FIG. 15 is a diagram showing a part of the gas insulated switchgear according to the first embodiment, and is a diagram viewed from an oblique direction in FIG. 14;

FIG. 16 is a diagram illustrating a part of the gas insulated switchgear according to the first embodiment, and illustrates aspects of a plurality of insulating barriers inserted between different-phase electric circuits.

FIG. 17 is a diagram showing a part of the gas insulated switchgear according to the first embodiment, showing an aspect of an insulating barrier inserted between the electric circuit and the wall surface of the sealed container.

FIG. 18 is a diagram showing a part of the gas insulated switchgear according to the first embodiment, showing an aspect of an insulating barrier inserted between an electric circuit and a wall surface of a closed container.

FIG. 19 is a diagram showing a part of the gas insulated switchgear according to the first embodiment, showing an aspect of an insulating barrier inserted between the electric circuit and the wall surface of the closed vessel.

FIG. 20 is a diagram illustrating a part of the gas insulated switchgear according to the first embodiment, illustrating an aspect of an insulation barrier inserted between an electric circuit and a wall surface of a closed container.

FIG. 21 is a cross-sectional view illustrating a configuration of a gas-insulated switchgear according to Embodiment 2.

FIG. 22 is a cross-sectional view illustrating a main part of the gas insulated switchgear according to the second embodiment, particularly illustrating a shape of a fold on an insulating barrier surface.

FIG. 23 is a cross-sectional view illustrating a configuration of a gas insulated switchgear according to a third embodiment.

FIG. 24 is a cross-sectional view showing a main part of the gas insulated switchgear according to the third embodiment, particularly for explaining the shape of the fold on the surface of the insulating barrier.

FIG. 25 is a cross-sectional view showing a main part of the gas insulated switchgear according to the third embodiment, particularly for explaining the shape of the fold on the surface of the insulating barrier.

FIG. 26 is a cross-sectional view illustrating a main part of the gas insulated switchgear according to the third embodiment, particularly illustrating a shape of a fold on an insulating barrier surface.

FIG. 27 is a cross-sectional view showing a main part of the gas insulated switchgear according to the third embodiment, particularly for explaining the shape of the fold on the surface of the insulating barrier.

28 is a view showing a gas insulated switchgear proposed so far, and is a cross-sectional view taken along line AA ′ of FIG. 29.

FIG. 29 is a side view of a conventional gas insulated switchgear.

FIG. 30 is a diagram showing a main structure of a conventional gas-insulated switchgear based on the conventional technology.

[Explanation of symbols]

1 to 3 vacuum valves, 4 sealed containers, 11 to 14 insulating barriers, 18 disconnector blades, 29 electrical paths, 30 barriers, 31 to 44, 61 to 66, 82 to 89, 94 folds, 90, 95 steps.

Claims (18)

[Claims] 1. A sealed container, an insulating gas sealed in the sealed container, a vacuum valve provided in the sealed container, and a conductor extending through the sealed container and connected to the vacuum valve. A three-phase electric circuit, an insulating barrier provided between the sealed container and the electric circuit and between the electric circuits to insulate between the electric circuits, a surface of the insulating barrier provided on the insulating barrier, A gas insulated switchgear having a barrier surface for preventing the progress of discharge along the path. 2. The method according to claim 1, wherein said insulating gas is 0.11M at 20.degree.
The gas-insulated switchgear according to claim 1, wherein the gas-insulated switchgear is sealed at a pressure of Pa or more. 3. The gas insulated switchgear according to claim 1, wherein the barrier surface is a rising wall surface of a plate-like fold rising from the surface of the insulating barrier. 4. The method according to claim 1, wherein the barrier surface is a step provided on a surface of the insulating barrier.
The gas insulated switchgear according to any one of the above. 5. The insulating barrier surface of the insulating barrier inserted between the electric circuit and the metal container is provided only on the surface of the insulating barrier facing the electric circuit among the front and back surfaces of the insulating barrier. The gas-insulated switchgear according to claim 1. 6. The insulation barrier according to claim 1, wherein the barrier surface of the insulation barrier inserted between the electric circuit and the metal enclosure is provided on both of the front and back surfaces of the insulation barrier. The gas-insulated switchgear according to any one of the above. 7. The gas insulation according to claim 1, wherein barrier surfaces on the surface of the insulating barrier inserted between the two different-phase electric circuits are provided on both surfaces of the insulating barrier. Switchgear. 8. The position of the barrier surface on the insulating barrier surface is determined by drawing a virtual shortest line connecting the two conductors facing each other across the insulating barrier, and measuring the virtual shortest line through the insulating barrier. The gas-insulated switchgear according to any one of claims 1 to 6, wherein at least a distance corresponding to a length from a conductor tip to a barrier surface in the virtual shortest line is secured. 9. A fold or step on the insulating barrier surface,
The gas insulated switchgear according to any one of claims 1 to 6, wherein the gas insulated switchgear is provided so as to surround the opposing electric circuit. 10. The gas insulated switch according to claim 1, wherein the number of folds provided on one side of the insulation barrier is two or more, and the shortest interval is at least 10 mm. apparatus. 11. The method according to claim 1, wherein the rising angle of the barrier surface provided on the insulating barrier surface from the insulating barrier substrate surface is not 90 degrees, or the barrier surface rises while being curved. Gas insulated switchgear. 12. The method according to claim 1, wherein the number of insulating barriers inserted between the electric circuit and the exposed portion of the conductor of the sealed container and between the different-phase charging paths is plural, and at least one of the insulating barriers is provided. The gas insulated switchgear according to any one of claims 1 to 11, wherein the barrier surface according to any one of the above is provided. 13. The gas insulated switchgear according to claim 1, wherein a height of the barrier surface provided on the insulating barrier surface from the insulating barrier substrate is 5 mm or more. 14. The method according to claim 1, wherein the barrier surface is a surface of the fold, and a width in a thin direction of a contact portion between the surface of the insulating barrier substrate and the fold or the protrusion is at least 5 mm. Or a gas insulated switchgear according to claim 1. 15. The gas-insulated switchgear according to claim 1, wherein the insulating barrier, the tip of the fold provided on the surface thereof, and the tip of the stepped portion do not contact the electric circuit. . 16. The fold or step and the insulating barrier are bonded,
16. The gas insulated switchgear according to claim 3, wherein the gas insulated switchgear is joined by a method such as fitting. 17. The gas insulated switchgear according to claim 3, wherein the folds or steps and the insulating barrier are integrally formed. 18. The insulating gas is one of pure SF6 gas, a mixed gas of SF6 gas and nitrogen, dry air having a moisture content of 3000 ppm or less, a mixed gas of nitrogen and oxygen, and pure nitrogen gas. Item 18. The gas insulated switchgear according to any one of Items 1 to 17.