JP2004129343A - Compound isolating type gas insulated switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compound insulating type gas insulated switchgear of improved reliability by suppressing behavior of foreign metal substance and development of surface discharge to raise insulation performance. <P>SOLUTION: Between a high voltage conductor 1 and a metal vessel 2, a cylindrical barrier insulator 5 which is coaxial with them is inserted. The barrier insulator 5 is insulated/supported by a protruding part of a support insulator 3. A shrinkage absorbing material 8 is sandwiched between the support insulator 3 and the barrier insulator 5. The shrinkage absorbing material 8 can absorb displacement in axial and radial directions. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas insulated switchgear used for power equipment, and more particularly to a composite insulated gas insulated switchgear having a barrier insulator inserted between a high-voltage conductor and a metal container in order to increase a withstand voltage value. It is.
[0002]
[Prior art]
At present, gas-insulated switchgear in which an insulating gas is sealed in a metal container is widely used in power systems. Here, a configuration example of a general gas insulated switchgear will be specifically described with reference to FIG. As shown in FIG. 10, a metal container 2 is provided, in which an insulating gas 4 is sealed and a high-voltage conductor 1 for energization is inserted. A support insulator 3 for insulatingly supporting the high-voltage conductor 1 is attached to the high-voltage conductor 1.
[0003]
As the insulating gas 4 sealed in the metal container 2, SF6 gas having excellent insulating performance and cooling performance is used. Such gas insulated switchgears are in high demand and are now the mainstream of gas insulated switchgears in substations and power plants. Further, in recent years, application to a 1100 kV class system is also planned, and higher voltage and higher capacity are being promoted.
[0004]
By the way, when increasing the voltage of the gas insulated switchgear, the electric field strength of the high-voltage conductor 1 shown in FIG. 10 increases, so in order to obtain excellent insulation performance, it is necessary to increase the size of the equipment and maintain the insulation distance. Alternatively, it is necessary to increase the pressure of the insulating gas to be sealed. When the pressure of the insulating gas is increased, the metal container 2 must be a pressure container that can withstand the pressure. However, it is very difficult to manufacture such a metal container 2 in a current production line. Therefore, in order to ensure excellent insulation performance when the voltage of the gas insulated switchgear is increased, it is necessary to increase the size of the equipment.
[0005]
Substations using these large gas insulated switchgears form the basis of power supply, but recently application to underground substations in urban areas and improved economics are strongly desired. Is urgently needed. In other words, the insulating configuration of the gas insulated switchgear is required to be able to cope with a high voltage while preventing an increase in size and an increase in the pressure of the sealed gas.
[0006]
Further, as a problem of the gas insulated switchgear, there is a decrease in insulation performance due to a foreign metal. The gas insulated switchgear can be significantly reduced in size and reduced in size by being filled with a gas having an excellent insulating performance under pressure, as compared with aerial insulation. The presence of only a small amount of metallic foreign matter significantly reduces the insulation performance between the high-voltage conductor 1 and the metal container 2. The metal foreign matter reciprocates between the high-voltage conductor 1 and the metal container 2 under the operating voltage, and when reaching the high-voltage conductor 1, a dielectric breakdown occurs in the insulating space between the high-voltage conductor 1 and the metal container 2. May occur. Such a decrease in insulation performance due to metallic foreign matter tends to become more serious as the size of the device is reduced.
[0007]
The needs for the gas insulated switchgear described above can be summarized as follows: 1. Promote miniaturization and high voltage without increasing the pressure of the sealed gas. It is possible to prevent the insulation performance from being deteriorated due to the metallic foreign matter. As a device that meets such needs, a composite insulated gas-insulated switchgear has been proposed. Specifically, there is a type in which the high-voltage conductor 1 or the metal container 2 is provided with an insulating coating (for example, see Patent Document 1), and a type in which a barrier insulator is inserted and arranged between the high-voltage conductor 1 and the metal container 2 . In such a composite insulating system using a gas and an insulating coating, even when nitrogen having a low dielectric strength is used as an insulating gas, an insulating structure having a size equivalent to that of a device using the current SF6 gas can be provided (for example, Non-Patent Document 1). Reference 1).
[0008]
[Patent Document 1]
Patent No. 3028975 [Non-Patent Document 1]
1999 National Conference of the Institute of Electrical Engineers of Japan No. 1542
[0009]
Further, in the composite insulation system in which the barrier insulator is inserted and arranged, the barrier insulator partitions the insulating gas space, so that the reciprocating motion of the metal foreign matter can be suppressed. Further, it is possible to limit the discharge generated from the foreign metal and the extension of the discharge from the high-voltage conductor 1. Therefore, it is possible to prevent the occurrence of insulation breakdown that short-circuits the insulation space, and to ensure high insulation performance.
[0010]
Further, since the insulating performance is improved by the barrier insulator, a gas other than the SF6 gas can be used as the insulating gas 4 sealed in the metal container 2. Specifically, a single gas of any of nitrogen gas, dry air and carbon dioxide gas, or a mixed gas containing any of these single gas and SF6 gas can be used. If these gases are used, the amount of SF6 gas used will be reduced, and excellent environmental harmony and economy can be obtained. Note that a glass fiber reinforced plastic (FRP) having excellent mechanical strength, an epoxy impregnated cast product, Teflon, or the like is usually used as the barrier insulator.
[0011]
[Problems to be solved by the invention]
However, the conventional composite insulation type gas insulated switchgear having a barrier insulator has the following problems. That is, when the metal container is thermally contracted, a cut may occur in the barrier insulator due to the force from the contracted metal container. If a break occurs in the barrier insulator, this becomes a weak point in electrical insulation, and the creeping discharge extends to this portion. As a result, there is a possibility that insulation breakdown that short-circuits the insulation space may occur.
[0012]
In addition, when the size of the gas insulated switchgear is reduced, the heat dissipation area of the high-voltage conductor 1 and the metal container 2 is accordingly reduced, so that the cooling performance is reduced and the operating temperature is likely to be increased. In particular, since the composite insulation type gas insulated switchgear can easily be miniaturized, it is important to secure excellent cooling performance in order to obtain stable operability.
[0013]
The present invention has been proposed in order to solve the above problems, and its main purpose is to improve the reliability by suppressing the behavior of metal foreign matter and the extension of creeping discharge to increase the insulation performance. An object of the present invention is to provide a composite insulation type gas insulated switchgear. It is another object of the present invention to provide a composite insulated gas-insulated switchgear which exhibits excellent cooling performance even when downsized and contributes to improvement of operation stability.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a metal container filled with an insulating gas, and a current-carrying high-voltage conductor insulated and supported by a supporting insulator is inserted into the metal container. A composite insulating gas insulated switchgear in which a barrier insulator is inserted between a voltage conductor and the metal container has the following features.
[0015]
According to the first aspect of the present invention, the support insulator and the barrier insulator are made of members which can be separated and independent from each other, and can absorb axial and radial displacement between the support insulator and the barrier insulator. It is characterized by sandwiching a flexible elastic absorber.
According to a second aspect of the present invention, when the barrier insulator is disposed in an insulating gas space sandwiched between two opposing support insulators, the barrier insulator comprises two or more barrier insulators having different diameters. The barrier insulators are characterized in that they have a multi-barrier structure that is nested and displaceable in the axial direction.
The invention according to claim 3 is characterized in that a plurality of the barrier insulators are arranged in the axial direction, and the barrier insulators are connected to each other by sandwiching a stretchable absorber capable of absorbing displacement in the axial and radial directions. I have.
[0016]
According to the first to third aspects of the present invention having the above-described configuration, even when the metal container thermally shrinks, the barrier insulator does not have a cut, and the gas space separated by the barrier insulator is completely sealed. be able to. Therefore, it is possible to confine the metallic foreign matter and the discharge in the gas space inside and outside the barrier insulator, and it is possible to secure excellent insulation performance.
[0017]
The invention according to claim 4 is characterized in that a projection protruding toward a potential side closer to the high-voltage conductor in an equipotential distribution is formed on a surface of the barrier insulator facing the high-voltage conductor.
According to the fourth aspect of the present invention, by extending a part of the barrier insulator toward the high-voltage conductor, the direction in which the discharge extends due to the electric field distribution and the creeping direction of the barrier insulator surface are substantially reversed. Can be For this reason, it is possible to suppress the discharge extension, and it is possible to reliably confine the discharge in the gas space inside the barrier insulator.
[0018]
The invention according to claim 7 is characterized in that a conductive material is buried inside the barrier insulator, and the buried material is set to the same potential as a high-voltage conductor.
According to the seventh aspect of the present invention, the electric field on the surface of the high-voltage conductor can be suppressed by making the conductive material in the barrier insulator and the high-voltage conductor have the same potential. Can be suppressed. In addition, since the conductive material inside the barrier insulator is covered with the insulator, discharge starting from the internal electrode can be suppressed, and excellent insulation performance can be secured.
[0019]
According to a ninth aspect of the present invention, a ventilation hole through which an insulating gas can pass is formed in the high-voltage conductor or the supporting insulator, and the insulating gas is circulated through the ventilation hole inside and outside the barrier insulator. It is characterized by having such a configuration.
According to the ninth aspect of the present invention, since the insulating gas circulates between the gas space inside the barrier insulator and the gas space outside the barrier insulator through the ventilation hole, the high-voltage conductor, the metal container, and the barrier insulating material are used. Objects can be cooled efficiently. Therefore, even when the gas insulated switchgear is downsized, the temperature rise can be suppressed, and the cooling performance can be increased to obtain stable operability.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment of a gas insulated switchgear according to the present invention will be described with reference to the drawings. Note that the same members as those of the conventional gas insulated switchgear shown in FIG. 10 are denoted by the same reference numerals and description thereof is omitted.
[0021]
Further, each of the embodiments described below is a composite insulation type gas insulated switchgear in which a barrier insulator is inserted and arranged. As for the material of the barrier insulator, as described above, a glass fiber reinforced plastic (FRP), an epoxy impregnated cast product, Teflon, or the like having excellent mechanical strength is used. Furthermore, since the insulation performance by the barrier insulator has been improved, in the following embodiment, the insulating gas 4 sealed in the metal container 2 is a gas other than SF6 gas, that is, any one of nitrogen gas, dry air, and carbon dioxide gas. Or a mixed gas containing any of these single gases and SF6 gas.
[0022]
[1. First Embodiment]
[1-1. Constitution]
FIG. 1 is a sectional view showing a configuration of a composite insulation type gas insulated switchgear according to a first embodiment of the present invention. The first embodiment corresponds to the first and ninth aspects of the present invention. As shown in FIG. 1, in the present embodiment, between the high-voltage conductor 1 and the metal container 2, a barrier insulator 5 having a coaxial cylindrical shape is inserted between the high-voltage conductor 1 and the metal container 2. The barrier insulator 5 is insulated and supported by the protrusion of the support insulator 3. In addition, a stretching absorber 8 is interposed between the supporting insulator 3 and the barrier insulator 5. The elastic absorber 8 is configured to be able to absorb axial and radial displacements. Further, in the first embodiment, the supporting insulator 3 is formed with the ventilation hole 3a through which the insulating gas can pass, and the insulating gas is circulated inside and outside the barrier insulator 5 through the ventilation hole 3a. Is configured.
[0023]
[1-2. Effect]
The operation and effect of the first embodiment having the above configuration are as follows. That is, even when the metal container 2 or the like is thermally contracted, the expansion / contraction absorber 8 absorbs the displacement in the axial direction and the radial direction. The space can be sealed. Therefore, metal foreign matter and discharge can be reliably confined in the gas spaces inside and outside the barrier insulator 5, and excellent insulation performance is secured and reliability is improved.
[0024]
Further, in the first embodiment, the insulating gas circulates between the gas space inside the barrier insulator 5 and the gas space outside the barrier insulator 5 through the ventilation hole 3 a provided in the support insulator 3. Therefore, the high-voltage conductor 1, the metal container 2, and the barrier insulator 5 can be efficiently cooled. Therefore, even when the gas-insulated switchgear is reduced in size and the heat radiation area is reduced, the rise in temperature can be reliably suppressed, and excellent cooling performance can be exhibited and stable operability can be obtained.
[0025]
[2. Second Embodiment]
[2-1. Constitution]
FIG. 2 is a cross-sectional view showing a configuration of a composite insulation type gas insulated switchgear according to a second embodiment of the present invention. The second embodiment corresponds to the second aspect of the present invention. As shown in FIG. 2, two barrier insulators 51 and 52 having different diameters coaxially cylindrical with each other are inserted between the high-voltage conductor 1 and the metal container 2 in the metal container 2. These barrier insulators 51 and 52 are nested and have a multiple barrier structure that can be displaced in the axial direction.
[0026]
More specifically, the ends of the barrier insulators 51 and 52 are insulated and supported by the protrusions of the support insulator 3, and the larger-diameter barrier insulator 51 is restrained by the support insulator 3 on the left side and has a smaller diameter. The smaller barrier insulator 52 is restrained by the right supporting insulator 3. That is, the right end of the barrier insulator 51 and the left end of the barrier insulator 52 are not restrained. Further, an elastic absorber 8 extending in the axial direction is interposed between the clearances of the two barrier insulators 51 and 52.
[0027]
[2-2. Effect]
In the second embodiment having the above-described configuration, both ends of the barrier insulators 51 and 52 are not restricted by the support insulator 3, so that even if the metal container 2 or the like is thermally contracted, it contracts. It can be easily displaced, especially in the axial direction. In addition, since the elastic absorber 8 is attached between the barrier insulators 51 and 52, one displacement can be absorbed here, and the other is not affected. Therefore, even if a contraction force acts on the barrier insulators 51 and 52, there is no possibility that a cut will occur. In addition, since the barrier insulators 51 and 52 overlap in a nested manner, the gas space separated by the barrier insulators 51 and 52 can be sealed. Thus, similarly to the first embodiment, the metal foreign matter and the discharge can be confined inside the barrier insulator 51 and inside the barrier insulator 52, and the insulation reliability can be improved.
[0028]
[3. Third Embodiment]
[3-1. Constitution]
FIG. 3 is a cross-sectional view showing a configuration of a composite insulation type gas insulated switchgear according to a third embodiment of the present invention. The third embodiment corresponds to claim 3. As shown in FIG. 3, in the third embodiment, between the high-voltage conductor 1 and the metal container 2 in the metal container 2, a plurality of coaxial cylindrical barrier insulators 5 are arranged and inserted in the axial direction. Have been. The metal container 2, the high-voltage conductor 1, and the barrier insulator 5 are all unitized with a predetermined length within the transport restrictions, the metal container 2 is flange-connected, and the high-voltage conductor 1 is slidable by a contact structure. In addition, the elastic absorber 8 is interposed between the barrier insulators 5.
[0029]
[3-2. Effect]
In the third embodiment having the above-described configuration, in a gas insulated switchgear having a configuration in which a plurality of barrier insulators 5 are arranged in the axial direction, the same operation and effect as those of the above-described embodiment can be obtained. That is, even if the metal container 2 or the like thermally contracts, the elastic insulator 8 attached between the barrier insulators 5 absorbs the displacement in the axial direction and the radial direction, so that the barrier insulator 5 itself may be cut. Absent. For this reason, the barrier insulator 5 can block the divided gas spaces, and it becomes possible to confine metallic foreign substances and discharge in the gas spaces inside and outside the barrier insulator 5.
[0030]
[4. Fourth Embodiment]
[4-1. Constitution]
FIG. 4 is a cross-sectional view showing a configuration of a composite insulation type gas insulated switchgear according to a fourth embodiment of the present invention. The fourth embodiment corresponds to the fourth and fifth aspects of the invention. As shown in FIG. 4, in the present embodiment, at both ends of the barrier insulator 5, protrusions 5 a bent toward the high-voltage conductor are formed, and a part of the inner surface of the barrier insulator 5 is coated with an inner surface. It is characterized by the fact that 7 is given. The inner surface coating 7 is made of a conductive material such as an insulating coating material filled with a conductive material such as AlN (aluminum nitride), SiC, ZnO or metal powder, a semiconductive material, and the resistance is changed by an electric field or current. Non-linear resistance material is used.
[0031]
[4-2. Effect]
FIG. 5 shows an equipotential distribution of the present embodiment. The discharge path 9 reaching the inner surface of the barrier insulator 5 from the high-voltage conductor 1 extends on the inner surface of the barrier substantially parallel to the equipotential surface. However, at the protruding portion 5a of the barrier insulator 5 folded toward the high-voltage conductor 1, the direction in which the discharge extends due to the electric field distribution is almost opposite to the creeping direction of the inner surface of the barrier insulator. For this reason, it is possible to suppress further discharge extension. Further, in the present embodiment, when the discharge starting from the high-voltage conductor 1 extends to the inner surface of the barrier insulator 5, the discharge charge is immediately diffused by the inner coating 7 on the inner surface of the barrier insulator 5. Can be. Therefore, it becomes possible to absorb the discharge energy and suppress further expansion, and the reliability of the gas insulated switchgear can be improved. Further, since the discharge can be confined in the barrier insulator 5, the place where the barrier insulator 5 is attached can be limited to a portion where the electric field strength of the high-voltage conductor is high. Is unnecessary, and the configuration can be easily simplified.
[0032]
[5. Fifth Embodiment]
[5-1. Constitution]
FIG. 6 is a sectional view showing a configuration of a composite insulation type gas insulated switchgear according to a fifth embodiment of the present invention. The fifth embodiment is a modification of the fourth embodiment, and corresponds to the invention of claim 6. As shown in FIG. 6, the feature of the present embodiment is that the inner coating 7 of the barrier insulator 5 and the high-voltage conductor 1 are connected by the connection member 6. Either a resistance material or a material having inductance is used for the connection member 6.
[0033]
[5-2. Effect]
In the fifth embodiment having the above-described configuration, in addition to the functions and effects of the fourth embodiment, the inner coating 7 of the barrier insulator 5 and the high-voltage conductor 1 are connected by the connection member 6 having resistance or inductance. The connection has the following advantages. That is, a surge voltage of the steep wave on the high voltage conductor 1 side induces a surge voltage on the inner surface of the barrier insulator 5, but since the barrier insulator 5 and the high voltage conductor 1 are connected by the connecting member 6. In addition, the surge voltage on the inner surface of the barrier insulator 5 can be suppressed. Therefore, discharge starting from the barrier insulator 5 can be suppressed, and the reliability of the gas insulated switchgear is greatly improved.
[0034]
[6. Sixth Embodiment]
[6-1. Constitution]
FIG. 7 is a sectional view showing a configuration of a composite insulation type gas insulated switchgear according to a sixth embodiment of the present invention. The sixth embodiment corresponds to claims 7 and 8. As shown in FIG. 7, in the present embodiment, a conductive material 5 b is buried inside the barrier insulator 5 and has the same potential as the high-voltage conductor 1. The conductive material 5b and the high-voltage conductor 1 are connected by a connection member 6 made of either a resistance material or a material having inductance.
[0035]
[6-2. Effect]
The operation and effect of the sixth embodiment as described above are as follows. In other words, the electric field on the surface of the high-voltage conductor 1 can be suppressed by making the conductive material 5b embedded in the barrier insulator 5 and the high-voltage conductor 1 existing inside the barrier insulator 5 the same potential. Therefore, discharge starting from the high-voltage conductor 1 can be suppressed. Also, since the conductive material 5b and the high-voltage conductor 1 are connected by the connection member 6 having resistance or inductance, the conductive material of the barrier insulator 5 is generated by the steep surge voltage generated in the high-voltage conductor 1. Even when a surge voltage is induced in 5b, it can be suppressed. Further, since the conductive material 5b is embedded in the barrier insulator 5, the conductive material 5b is covered with the insulator and has an advantage that the start of discharge can be suppressed.
[0036]
[7. Other Embodiments]
Note that the present invention is not limited to the above-described embodiment, and specific shapes of respective members, or mounting positions and mounting methods can be appropriately changed. For example, the shape of the barrier insulator 5 is not limited to the illustrated one, but may be another shape as long as the shape can suppress discharge extension. Also, the ventilation hole for circulating the insulating gas may be provided not on the supporting insulator but on the high voltage conductor side. Further, as an embodiment corresponding to the tenth aspect, an embodiment having a gas circulating means for forcibly circulating the insulating gas through the ventilation hole is included. According to such an embodiment, since the insulating gas is forcibly circulated by the gas circulating means, more excellent cooling performance can be secured.
[0037]
8 and 9 are sectional views showing the configuration of a gas insulated disconnector according to another embodiment of the present invention. In FIG. 8, a barrier insulator 53 is inserted between the metal container 2 and the arc 13 generated between the movable contact portion 11 and the fixed contact portion 10 in the metal container 2. The barrier insulator 53 is insulated and supported by the support insulator 3 attached to the inner wall of the metal container 2. Note that the barrier insulator 51 has protrusions 5a protruding toward the high-voltage conductor 1 at both ends. Further, an inner surface coating 7 is applied to a part of the inner surface of the barrier insulator 53.
[0038]
In the above embodiment, since the barrier insulator 53 is inserted between the arc 13 and the metal container 2, even if the electric field on the surface of the arc 13 increases, the discharge generated toward the metal container 2 from the electric field increases. Progress can be limited. Therefore, it is possible to prevent the occurrence of insulation breakdown that short-circuits the insulation space, and to ensure high reliability.
[0039]
In the embodiment shown in FIG. 9, a barrier insulator 54 is inserted between the movable contact part 11 and the fixed contact part 10 and the metal container 2 in the metal container 2. The barrier insulator 54 also has protrusions 5 a protruding toward the high-voltage conductor 1 at both ends, and a part of the inner surface of the barrier insulator 52 is provided with an inner coating 7. .
[0040]
In the above embodiment, even if the insulation performance from the electrode surface is reduced due to the presence of the hot gas 12 or the like due to the arc 13, the fixed contact portion 10 and the movable contact portion 11, which are high-voltage portions, and the metal container Since the barrier insulator 54 is inserted between the metal container 2 and the metal container 2, the progress of the discharge generated toward the metal container 2 can be limited. As a result, similarly to the embodiment shown in FIG. 8, it is possible to prevent the occurrence of dielectric breakdown that short-circuits the insulating space, thereby contributing to an improvement in reliability.
[0041]
【The invention's effect】
As described above, according to the present invention, the behavior of metal foreign matter and the extremely simple structure of sandwiching the elastic absorber capable of absorbing axial and radial displacement between the supporting insulator and the barrier insulator can be achieved. The insulation performance can be enhanced by suppressing the extension of the creeping discharge, thereby providing a composite insulation type gas insulated switchgear with improved reliability.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a configuration of a gas insulated switchgear according to a first embodiment of the present invention.
FIG. 2 is a sectional view showing a configuration of a gas-insulated switchgear according to a second embodiment of the present invention.
FIG. 3 is a sectional view showing a configuration of a gas insulated switchgear according to a third embodiment of the present invention.
FIG. 4 is a sectional view showing a configuration of a gas insulated switchgear according to a fourth embodiment of the present invention.
FIG. 5 is a diagram showing an equipotential distribution in the embodiment.
FIG. 6 is a sectional view showing a configuration of a gas insulated switchgear according to a fifth embodiment of the present invention.
FIG. 7 is a sectional view showing a configuration of a gas insulated switchgear according to a sixth embodiment of the present invention.
FIG. 8 is a sectional view showing a configuration of a gas insulated switchgear according to another embodiment of the present invention.
FIG. 9 is a sectional view showing a configuration of a gas insulated switchgear according to another embodiment of the present invention.
FIG. 10 is a sectional view showing a configuration of a conventional gas insulated switchgear.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... High voltage conductor 2 ... Metal container 3 ... Support insulator 3a ... Vent hole 4 ... Insulating gas 5, 51, 52, 53, 54 ... Barrier insulator 5a ... Projection 5b ... Conductive material 6 ... Connection member 7 ... Inner surface coating 8 ... Elastic absorber 9 ... Discharge path 10 ... Fixed contact section 11 ... Movable contact section 12 ... Heat gas 13 ... Arc

Claims (10)

A metal container filled with an insulating gas is provided, and a high-voltage conductor for electric conduction insulated and supported by a supporting insulator is inserted into the metal container, and a barrier insulator is further provided between the high-voltage conductor and the metal container. In the compound insulation type gas insulated switchgear inserted and arranged,
The support insulator and the barrier insulator are made of a member that can be separated and independent from each other,
A composite insulated gas insulated switchgear, wherein a stretchable absorbing material capable of absorbing axial and radial displacements is sandwiched between the supporting insulator and the barrier insulator. A metal container filled with an insulating gas is provided, and a high-voltage conductor for electric conduction insulated and supported by a supporting insulator is inserted into the metal container, and a barrier insulator is further provided between the high-voltage conductor and the metal container. In the compound insulation type gas insulated switchgear inserted and arranged,
When arranging the barrier insulator in an insulating gas space sandwiched between two opposing support insulators, the barrier insulator comprises two or more barrier insulators having different diameters, and each barrier insulator is nested. And a multi-barrier structure capable of being displaced in the axial direction. A metal container filled with an insulating gas is provided, and a high-voltage conductor for electric conduction insulated and supported by a supporting insulator is inserted into the metal container, and a barrier insulator is further provided between the high-voltage conductor and the metal container. In the compound insulation type gas insulated switchgear inserted and arranged,
A plurality of the barrier insulators are arranged side by side in the axial direction,
A composite insulated gas insulated switchgear, characterized in that a stretchable absorber capable of absorbing axial and radial displacements is sandwiched between barrier insulators and connected. A metal container filled with an insulating gas is provided, and a high-voltage conductor for electric conduction insulated and supported by a supporting insulator is inserted into the metal container, and a barrier insulator is further provided between the high-voltage conductor and the metal container. In the compound insulation type gas insulated switchgear inserted and arranged,
A composite insulated gas insulated switchgear, wherein a protrusion protruding toward a potential side closer to the high voltage conductor in an equipotential distribution is formed on a surface of the barrier insulator facing the high voltage conductor. The surface of the barrier insulator facing the high-voltage conductor is coated with at least one of a conductive material layer, a semiconductive material layer, and a non-linear resistance material layer. The composite insulated gas insulated switchgear according to any one of the preceding claims. 6. The composite insulated gas insulated switchgear according to claim 5, wherein said barrier insulator and said high-voltage conductor are connected by a resistance material or a material having an inductance. A metal container filled with an insulating gas is provided, and a high-voltage conductor for electric conduction insulated and supported by a supporting insulator is inserted into the metal container, and a barrier insulator is further provided between the high-voltage conductor and the metal container. In the compound insulation type gas insulated switchgear inserted and arranged,
A conductive material is embedded inside the barrier insulator,
A composite insulated gas insulated switchgear, wherein the conductive material is set at the same potential as the high voltage conductor. 8. The composite insulated gas insulated switchgear according to claim 7, wherein the conductive material and the high voltage conductor embedded in the barrier insulator are connected by a resistance material or a material having an inductance. . A metal container filled with an insulating gas is provided, and a high-voltage conductor for electric conduction insulated and supported by a supporting insulator is inserted into the metal container, and a barrier insulator is further inserted between the high-voltage conductor and the metal container. In the compound insulation type gas insulated switchgear inserted and arranged,
A composite hole, wherein a ventilation hole through which an insulating gas can pass is formed in the high-voltage conductor or the supporting insulator, and the insulating gas is circulated inside and outside the barrier insulator through the vent hole. Insulation type gas insulated switchgear. 10. The composite insulated gas insulated switchgear according to claim 9, further comprising gas circulation means for forcibly circulating the insulating gas through the vent hole.

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