JP7235240B2 - Spacers and insulators - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act (1) Organized by the Committee of the Kyushu Section Joint Conference of Electrical and Information Engineers, September 27, 2018- September 28, 2018 (2) 2018 IEEE CEIDP/IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA (Conference on Electrical Insulation and Dielectric Phenomena) Program, October 21, 2018 to October 24, 2018

TECHNICAL FIELD The present invention relates to a spacer and an insulating device, and more particularly to a spacer that holds a conductor insulated from its surroundings and an insulating device using the spacer.

In recent years, insulation devices such as gas insulated switchgear (GIS: Gas Insulated Switchgear) using SF6 (sulfur hexafluoride) gas, etc., installed in substations, etc. Miniaturization is desired.

In general, a gas-insulated switchgear is a state in which a conductive member to which a high voltage is applied and electrical equipment such as a switchgear are housed in a grounded metal container (also called a “grounded container”). It has a structure in which a gas such as SF6, which has higher dielectric strength than air, is enclosed in a grounded container. A conductive member to which a high voltage is applied is supported in the grounded container in a state of being insulated from the grounded container by a spacer. The spacer is mainly composed of a resin material such as epoxy resin, for example.

As one method for downsizing the gas-insulated switchgear, it is effective to shorten the distance between the high-voltage conductor and the grounding container to shorten the outer diameter of the grounding container. To that end, it is necessary to improve the dielectric strength of the insulating spacer between the high voltage conductor and the ground vessel.

As a method of improving the dielectric strength of an insulating spacer, for example, Non-Patent Document 1 below discloses a method of forming an insulating spacer with an epoxy resin to which a filler agent is added.

"IV. Cast Insulator for Gas Insulated Switchgear", Shotaro Tominaga, Shojiro Kodai, December 1977, Journal of the Institute of Electrical Engineers of Japan.

According to the insulating spacer disclosed in Non-Patent Document 1, a region (hereinafter referred to as "triple (also referred to as "junction part"), the electric field becomes extremely high, and as a result, the insulating spacer may be damaged and the insulation performance in the gas-insulated switchgear may be degraded.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems described above, and an object of the present invention is to reduce an electric field between a spacer and a conductive member to which a high voltage is applied in an insulating device.

A structure according to a representative embodiment of the present invention includes a first conductive member, a second conductive member different from the first conductive member, and the first conductive member and the second conductive member. and a nonlinear resistance member disposed within the insulating member in contact with the first conductive member, wherein the insulating member and the first conductive member The distance from the center of the first region where the nonlinear resistance member and the first conductive member are in contact to the edge of the first region is defined as r1, and the distance from the center of the second region where the nonlinear resistance member and the first conductive member are in contact with the second region is r1. It is characterized in that 0.8r1≤r2≤r1, where r2 is the distance to the edge of the region.

According to the structure of the present invention, it is possible to reduce the electric field between the spacer and the conductive member to which a high voltage is applied in the insulating device.

1 is a cross-sectional view of a structure according to an embodiment of the invention; FIG. FIG. 2 is a top view of the structure according to the embodiment of the present invention, viewed from the positive side in the Z direction of FIG. 1; 7 is an enlarged view of region 700 of the structure in FIG. 1; FIG. FIG. 10 is a diagram for explaining a method of making a sample of an insulating member including a nonlinear resistance member; It is a figure which shows the structure of the sample used for the analysis. FIG. 6 is a diagram showing analysis results regarding the electric field relaxation effect of the triple junction TJ when the sample shown in FIG. 5 is used; BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the gas insulated switchgear to which the structure which concerns on this Embodiment is applied. FIG. 8 is an enlarged view of a joint portion between a high voltage conductor and a spacer in the insulating device shown in FIG. 7; It is a figure which shows another example of the gas insulated switchgear to which the structure which concerns on this Embodiment is applied. FIG. 10 is an enlarged view of a joint portion between a high voltage conductor and a spacer in the insulating device shown in FIG. 9;

1. Outline of Embodiment First, an outline of a representative embodiment of the invention disclosed in the present application will be described. In the following description, as an example, reference numerals on the drawings corresponding to constituent elements of the invention are described with parentheses.

[1] A structure (10) according to a representative embodiment of the present invention comprises a first conductive member (1), a second conductive member (2) different from the first conductive member, and An insulating member (30) arranged sandwiched between a first conductive member and the second conductive member, and a non-linear structure arranged within the insulating member in contact with the first conductive member Let r1 be the distance from the center (P1) of a first region (40) having a resistive member (31) where the insulating member and the first conductive member are in contact with the end of the first region, When r2 is the distance from the center (P2) of the second region (41) where the nonlinear resistance member and the first conductive member are in contact with the end of the second region, 0.8r1≤r2≤r1 It is characterized by

[2] In the above structure, 0.980r1≤r2≤0.995r1.

[3] In the above structure, the nonlinear resistance member may be embedded in a hole (303) formed in a surface (300) of the insulating member that contacts the first conductive member.

[4] The spacers (3A, 3B) according to the representative embodiment of the present invention are joined to the first conductive members (1A, 1B) at one end, and are different from the first conductive member at the other end. an insulating member (30A, 30B) joined to a second conductive member (2A, 2B) and supporting said first conductive member on said second conductive member; and in contact with said first conductive member. a non-linear resistance member (31A, 31B) disposed on the one end side of the insulating member, and a first region (40A, 40B) where the insulating member and the first conductive member are in contact with each other. The distance from the center (P1) to the end of the first region is r1, and the center (P2) of the second regions (41A, 41B) where the nonlinear resistance member and the first conductive member are in contact with the It is characterized in that 0.8r1≤r2≤r1, where r2 is the distance to the end of the second region.

[5] In the above spacer, 0.980r1≤r2≤0.995r1.

[6] An insulating device (100A, 100B) according to a representative embodiment of the present invention includes: a ground container (2A, 2B) connected to a ground potential; a conductive member (1A, 1B) to be applied and a spacer (3A, 3B) supporting said conductive member within said grounded container, said spacer being joined at one end to said conductive member; , an insulating member (30A, 30B) joined to the grounding container at the other end, and a nonlinear resistance member (31A, 31B) disposed in the insulating member in contact with the conductive member, Let r1 be the distance from the center (P1) of the first region (40A, 40B) where the insulating member and the conductive member are in contact with the end of the first region, and the nonlinear resistance member and the conductive member 0.8r1≤r2≤r1, where r2 is the distance from the center (P2) of the second regions (41A, 41B) to the edge of the second region.

[7] In the insulating device, 0.980r1≤r2≤0.995r1.

2. Specific Examples of Embodiments Specific examples of embodiments of the present invention will be described below with reference to the drawings.
In the following description, constituent elements common to each embodiment are denoted by the same reference numerals, and repeated descriptions are omitted. Also, it should be noted that the drawings are schematic, and the relationship of dimensions of each element, the ratio of each element, and the like may differ from reality. Even between the drawings, there are cases where portions with different dimensional relationships and ratios are included.

1 to 3 are diagrams showing configurations of structures according to embodiments of the present invention.
FIG. 1 shows a cross-sectional view of a structural body 10 according to an embodiment of the present invention, and FIG. 2 shows a top view of the structural body 10 viewed from the Z-direction positive side of FIG. FIG. 3 shows an enlarged view of region 700 of structure 10 shown in FIG.

The structure 10 has a configuration in which an insulating member insulates between a plurality of conductors to which different voltages are applied. The structure 10 is applied to an insulating device such as a gas-insulated switchgear, as will be described later.

Specifically, the structure 10 has a first conductive member 1 , a second conductive member 2 , an insulating member 30 and a nonlinear resistance member 31 . 1 to 3, as an example, the first conductive member 1, the second conductive member 2, the insulating member 30, and the nonlinear resistance member 31 are laminated along the Z-axis, and the surface 300 of the insulating member 30, 301 is arranged parallel to the XY plane.

The first conductive member 1 is mainly composed of a conductive material (eg, aluminum or copper), and is a high-voltage conductor to which a high voltage of 6,000 V or higher is applied, for example. The first conductive member 1 is formed, for example, in a cylindrical shape.

The second conductive member 2 is mainly composed of a conductive material (eg, aluminum or iron), and is connected to ground potential, for example. The second conductive member 2 is formed in a disc shape.

The insulating member 30 is mainly composed of an insulating material. The insulating material is a material containing resin as a main component, for example, a material containing thermosetting resin such as epoxy resin as a main component. The insulating member 30 has a surface 300 and a surface 301 facing the surface 300 . The insulating member 30 is joined to the first conductive member 1 on the surface 300 and joined to the second conductive member 2 on the surface 301 .

As shown in FIG. 1 , the insulating member 30 is placed between the first conductive member 1 and the second conductive member 2 . The insulating member 30 is formed, for example, in the shape of a rectangular plate in plan view.

The nonlinear resistance member 31 includes a nonlinear resistance material (hereinafter also referred to as “NRM: Non-Linear Resistive Material”). For example, the nonlinear resistance member 31 is made of a composite material in which zinc oxide (ZnO) varistor particles are added to epoxy resin. The nonlinear resistance member 31 has, for example, a cylindrical shape with one end formed flat and the other end formed into a curved surface.

The nonlinear resistance member 31 is arranged between a surface 300 of the insulating member 30 that contacts the first conductive member 1 and a surface 301 of the insulating member 30 that contacts the second conductive member 2 . . Specifically, the nonlinear resistance member 31 is arranged within the insulating member 30 while being in contact with the first conductive member 1 . For example, as shown in FIGS. 1 and 3, the non-linear resistance member 31 is arranged in a state of being embedded in a hole (for example, non-through hole) 303 formed in the surface 300 of the insulating member 30 . A portion of the nonlinear resistance member 31 is exposed from the surface 300 of the insulating member 30 and is in contact with the first conductive member 1 .

As described above, the first conductive member 1 contacts the surface 300 of the insulating member 30 and contacts the non-linear resistance member 31 . In FIG. 2, the first region where the first conductive member 1 and the insulating member 30 are in contact is denoted by reference numeral 40, and the second region where the first conductive member 1 and the nonlinear resistance member 31 are in contact is denoted by reference numeral 40. 41.

Here, when the distance from the center P1 of the first region 40 to the edge of the first region 40 is r1, and the distance from the center P2 of the second region 41 to the edge of the second region 41 is r2, 0 By forming the structure 10 so that 8r1 ≤ r2 ≤ r1, the triple junction portion where the first conductive member 1 and the insulating member 30 are closest to each other through a gas (for example, air or a gas such as SF6) is formed. It becomes possible to reduce the intensity of the electric field of the TJ more effectively.

Analysis results of the structure 10 realized using samples of the insulating member 30 including the nonlinear resistance member 31 are shown below.

4A and 4B are diagrams for explaining a method of manufacturing a sample of the insulating member 30 including the nonlinear resistance member 31. FIG.

First, the insulating member 30 is produced. For example, a mold for resin molding is prepared, a melted epoxy resin is poured into the mold and hardened, and the molded resin processed product is removed from the mold. For example, the mold is formed with protrusions so that the above-described holes 303 are formed in the molded resin processed product (insulating member 30).

Next, a mixture is made to make the non-linear resistance member 31 . For example, a mixture 320 is produced by adding zinc oxide (ZnO) particles of a nonlinear resistance material (microvaristor) to an epoxy resin and mixing and defoaming using a mixer.

After that, as shown in FIG. 4 , cylindrical member 400 is placed on resin processed product 310 so as to cover hole 303 formed in resin processed product 310 , and mixture 320 is introduced into cylindrical member 400 . Thereby, the mixture 320 settles in the holes 303 of the resin processed product 310 . A sample in which the nonlinear resistance member 31 is formed inside the insulating member 30 can be produced by placing the resin processed product 310 on which the cylindrical member 400 is placed in a constant temperature bath and heating it for a predetermined time.
In this analysis, a plurality of samples were created by changing the distance r2 related to the nonlinear resistance member 31 described above.

Next, the structure 10 is formed using the sample prepared by the above method, and the electric field of the triple junction TJ when an impulse voltage is applied between the first conductive member 1 and the second conductive member 2 strength was calculated.

FIG. 5 is a diagram showing the configuration of a sample used for analysis.
As shown in the figure, the radius of the first conductive member 1 as a cylindrical electrode was set to 7.5 mm, and the radius of curvature of one end of the first conductive member 1 was set to 2.5 mm. Further, the radius of the second conductive member 2 as a disk-shaped electrode was set to 25 mm, and the radius of curvature of the end portion of the second conductive member 2 was set to 5 mm. In addition, the thickness of the insulating member 30 in the sample prepared by the above method was 10.5 mm, the distance from the center P1 of the insulating member 30 to the end was 30 mm, and the contact area between the first conductive member 1 and the insulating member 30 The radius (r1) of is set to 5 mm.

Furthermore, the depth of the nonlinear resistance member 31 in the sample was set to 10 mm, and the radius (r2) of the nonlinear resistance member 31 was set to a different value for each sample. Note that FIG. 5 shows an example in which the radius (r2) of the nonlinear resistance member 31 is 5 mm.

FIG. 6 is a diagram showing analysis results regarding the electric field relaxation effect of the triple junction TJ when the sample shown in FIG. 5 is used.

In the figure, the vertical axis represents the intensity of the electric field [kV/mm]. Reference numerals 500 to 505 shown in the figure connect the second conductive member 2 in the structure 10 shown in FIG. time: 1 μs, pulse width: 50 μs), the intensity of the electric field at the triple junction TJ for each sample is shown.

That is, reference numeral 500 represents the intensity of the electric field at the triple junction TJ when using a sample in which the insulating member 30 is not provided with the nonlinear resistance member 31, and reference numeral 501 represents the sample with r2=0.4r1. Reference numeral 502 represents the intensity of the electric field at the triple junction TJ when a sample with r2=0.8r1 is used, and reference numeral 503 represents the intensity of the electric field at the triple junction TJ when r2=0.8r1. =r1, the intensity of the electric field at the triple junction TJ is shown. Further, reference numeral 504 represents the intensity of the electric field at the triple junction TJ when using the sample with r2=1.2r1, and reference numeral 505 represents the triple It represents the intensity of the electric field at the junction TJ.

As can be understood from FIG. 6, as the distance r2 related to the nonlinear resistance member 31 approaches the distance r1 related to the insulating member 30, the intensity of the electric field at the triple junction TJ tends to decrease. That is, as the end of the region 41 of the nonlinear resistance member 31 contacting the first conductive member 1 approaches the end of the region 40 of the insulating member 30 contacting the first conductive member 1, the electric field of the triple junction TJ increases. strength tends to decrease.

As can be understood from this analysis result, by forming the nonlinear resistance member 31 in the insulating member 30 so as to satisfy 0.8r1≦r2≦r1, the electric field of the triple junction TJ can be more effectively relaxed. becomes possible.

On the other hand, as can be understood from FIG. 6, when the distance r2 related to the non-linear resistance member 31 exceeds the distance r1 related to the insulating member 30, the electric field intensity of the triple junction TJ tends to rise sharply. For example, in the case of a sample with r2=r1, the electric field strength is 3.5 kV/mm, while in the case of a sample with r2=1.2r1, the electric field strength is 101 kV/mm, and r2=1.5r1. In the case of the sample with 146 kV/mm, the electric field intensity is 146 kV/mm.

Thus, when the nonlinear resistance member 31 is formed beyond the contact area between the insulating member 30 and the first conductive member 1 (when r2>r1), the electric field relaxation effect of the triple junction TJ can be obtained. In addition, the strength of the electric field is further increased, which is not preferable.

By the way, it is known that an insulating device such as a gas-insulated switchgear expands and contracts a grounding container of the insulating device depending on the usage conditions and the surrounding environment. The expansion ratio is, for example, in the range of 0.5-2% depending on the material of the grounded container.

Therefore, in order to prevent r2>r1 in the structure 10 when the structure 10 according to the present embodiment is applied to the above insulating device, the expansion ratio of the grounding container is taken into consideration, and 0.980r1 It is preferable that ≦r2≦0.995r1.

That is, by forming the nonlinear resistance member 31 in the insulating member 30 so as to satisfy 0.980r1≦r2≦0.995r1, when the structure 10 is applied to an insulating device such as a gas-insulated switchgear, the insulating device Even if the position of the insulating member 30 (nonlinear resistance member 31) with respect to the first conductive member 1 is displaced due to expansion and contraction of the grounding container during operation of the nonlinear resistance member 31, the nonlinear resistance member 31 is connected to the insulating member 30 and the first conductive member. Exceeding the contact area with the member 1 can be prevented. As a result, the electric field at the triple junction TJ can be reliably reduced regardless of the usage conditions of the insulating device and the surrounding environment.

Next, an application example of the structure 10 according to the present embodiment to a gas-insulated switchgear is shown.
FIG. 7 is a diagram showing an example of a gas-insulated switchgear to which the structure 10 according to this embodiment is applied. The figure shows a cross-sectional structure of a portion of the gas-insulated switchgear 100B to which the structural body 10 is applied.

As shown in FIG. 7, the gas-insulated switchgear 100B has a grounded container 2A, a high-voltage conductor 1A, and a spacer 3A.

A grounding container (grounding tank) 2A is a conductive member that accommodates the high voltage conductor 1A. The grounded container 2A is made of, for example, a metal material such as iron, stainless steel, or aluminum, and has a cylindrical shape, for example. The grounding container 2A accommodates the high-voltage conductor 1A and is filled with a gas 5 such as air or SF6. The ground container 2A is connected to ground potential.

The high-voltage conductor 1A is a conductive member to which a high voltage of, for example, 60,000 V or higher is applied, and is made of a metal material (eg, aluminum). The high voltage conductor 1A extends inside the grounded container 2A. The high-voltage conductor 1A extends inside the grounded container 2A, for example, in the same direction as the grounded container 2A.

The spacer 3A is a component that supports the high-voltage conductor 1A in a state of being insulated from the grounding container 2 inside the grounding container 2A. The spacer 3A has an insulating member 30A and a nonlinear resistance member 31A.

The insulating member 30A, like the insulating member 30 described above, is made of a material containing a thermosetting resin such as an epoxy resin as a main component. The insulating member 30A is formed, for example, in the shape of a truncated cone.

The insulating member 30A is joined at one end to the high voltage conductor 1A and at the other end to the grounding container 2A to support the high voltage conductor 1A on the inner wall surface of the grounding container 2A.
For example, as shown in FIG. 7, the bottom surface of the insulating member 30A is joined to the grounding container 2A while being in contact with the grounding container 2A, and the top surface facing the bottom surface of the insulating member 30A is in contact with the high voltage conductor 1A. It is joined to the voltage conductor 1A.

The nonlinear resistance member 31A is made of NRM similar to the nonlinear resistance member 31 described above. The nonlinear resistance member 31A is arranged on one end side of the insulating member 30A while being in contact with the high voltage conductor 1A. Specifically, the nonlinear resistance member 31A is arranged in a state of being embedded in a hole (for example, non-through hole) 303A formed in the upper surface of the insulating member 30A. A portion of the nonlinear resistance member 31A is exposed from the insulating member 30 and is in contact with the high voltage conductor 1A.

FIG. 8 is an enlarged view of a joint portion between the high-voltage conductor 1A and the spacer 3A in the insulating device 100A shown in FIG.

As shown in FIGS. 7 and 8, the distance from the center P1 of the region 40A where the insulating member 30A and the high-voltage conductor 1A are in contact to the edge of the region 40A is defined as r1, and the non-linear resistance member 31A and the high-voltage conductor 1A 0.8r1 ≤ r2 ≤ r1, more preferably 0.980r1 ≤ r2 ≤ 0.995r1, where r2 is the distance from the center P2 of the region 41A in contact with the edge of the region 41A. , a spacer 3A is formed and joined to the high voltage conductor 1A.

According to this, the electric field intensity of the triple junction TJ in the insulating device 100A can be effectively relaxed.

FIG. 9 is a diagram showing another example of a gas-insulated switchgear to which the structure 10 according to this embodiment is applied. The figure shows a cross-sectional structure of a portion of the gas-insulated switchgear 100B to which the structural body 10 is applied.

As shown in FIG. 9, the gas-insulated switchgear 100B has a grounding container 2B, a high-voltage conductor 1B, and a spacer 3B.

A ground container (ground tank) 2B is a conductive member that accommodates the high voltage conductor 1B. The grounding container 2B is made of, for example, a metal material such as iron, stainless steel, or aluminum, and has a cylindrical shape, for example. The ground container 2B accommodates the high-voltage conductor 1B inside and is filled with a gas 5 such as air or SF6. The ground container 2B is connected to ground potential.

The high voltage conductor 1B is a conductive member to which a high voltage is applied, and is made of the same metal material as the high voltage conductor 1A. The high-voltage conductor 1B extends inside the grounding container 2B, for example, in the same direction as the grounding container 2B.

The spacer 3B is a component that supports the high-voltage conductor 1B inside the grounding container 2B while being insulated from the grounding container 2B. The spacer 3B has an insulating member 30B and a nonlinear resistance member 31B.

The insulating member 30B, like the insulating member 30 described above, is made of a material whose main component is a thermosetting resin such as an epoxy resin. The insulating member 30B has, for example, a tapered tubular shape, in other words, a hollow truncated cone shape.

The insulating member 30B is joined at one end to the high voltage conductor 1B and at the other end to the grounding container 2B, and supports the high voltage conductor 1B on the inner wall surface of the grounding container 2B. Specifically, the insulating member 30B is joined to the high-voltage conductor 1B at one end in the axial direction, and joined to the grounding container 2B at the other end in the axial direction.

For example, as shown in FIG. 9, the high-voltage conductor 1B is joined to the insulating member 30B while passing through the insulating member 30B along the axis of the insulating member 30B.

The nonlinear resistance member 31B is made of NRM similar to the nonlinear resistance member 31 described above. The nonlinear resistance member 31B is arranged on one end side of the insulating member 30B while being in contact with the high voltage conductor 1B. Specifically, the non-linear resistance member 31B is arranged in a state of being embedded in a hole (for example, a non-through hole) 303B formed in the surface of the insulating member 30B that contacts the high-voltage conductor 1B. A portion of the nonlinear resistance member 31B is exposed from the insulating member 30B and contacts the high voltage conductor 1B.

FIG. 10 is an enlarged view of the junction between the high voltage conductor 1B and the spacer 3B in the insulating device 100B shown in FIG.
As shown in FIGS. 9 and 10, the distance from the center P1 of the region 40B where the insulating member 30B and the high-voltage conductor 1B are in contact to the edge of the region 40B is defined as r1, and the nonlinear resistance member 31B and the high-voltage conductor 1B 0.8r1 ≤ r2 ≤ r1, more preferably 0.980r1 ≤ r2 ≤ 0.995r1, where r2 is the distance from the center P2 of the region 41B in contact with the edge of the region 41B to the edge of the region 41B. , a spacer 3B is formed and joined to the high voltage conductor 1B.
According to this, the electric field intensity of the triple junction TJ in the insulating device 100B can be effectively relaxed.

By using a nonlinear resistance material as the embedded material, the electric field load on the solid insulator under the operating electric field can be reduced compared to the metal embedded electrode.

<<Expansion of Embodiment>>
Although the invention made by the inventors of the present invention has been specifically described above based on the embodiments, it goes without saying that the invention is not limited thereto, and that various modifications can be made without departing from the gist of the invention. stomach.

For example, the shapes of the spacers 3A and 3B of the gas-insulated switchgear 100A and 100B shown in FIG. Other shapes can be adopted as long as the positional relationship with the conductive member 1) is satisfied.

Reference Signs List 1 first conductive member 1A, 1B high-voltage conductor (first conductive member) 2 second conductive member 2A, 2B grounding container (second conductive member) 3 insulating member 3A, 3B... spacer, 5... gas (gas), 10... structure, 30, 30A, 30B... insulating member, 31, 31A, 31B... nonlinear resistance member, 40, 40A, 40B... first region, 41, 41A , 41B... second area, 100A, 100B... gas insulated switchgear, 300, 301... surfaces, 303, 303A, 303B... holes (for example, non-through holes), P1... center of first area, P2... second area center, r1 --- distance (radius) from the center P1 of the first region to the end of the first region P1, r2 --- distance (radius) from the center P2 of the second region to the end, TJ --- triple junction.

Claims (7)

a first conductive member;
a second conductive member different from the first conductive member;
an insulating member sandwiched between the first conductive member and the second conductive member;
a non-linear resistance member disposed within the insulating member in contact with the first conductive member;
The distance from the center of the first region where the insulating member and the first conductive member are in contact to the end of the first region is defined as r1, and the distance between the nonlinear resistance member and the first conductive member is the distance r1. where r2 is the distance from the center of the second region to the end of the second region, 0.8r1 ≤ r2 ≤ r1 ;
The structure, wherein the insulating member, the first conductive member, and the non-linear resistance member are arranged such that the center of the first region and the center of the second region are aligned. . The structure of claim 1, wherein
A structure characterized in that 0.980r1≤r2≤0.995r1. A structure according to claim 1 or 2,
The structure, wherein the non-linear resistance member is embedded in a hole formed in a surface of the insulating member that is in contact with the first conductive member. bonded at one end to a first conductive member and at the other end bonded to a second conductive member different from said first conductive member, supporting said first conductive member on said second conductive member an insulating member;
a nonlinear resistance member disposed on the one end side of the insulating member in contact with the first conductive member;
The distance from the center of the first region where the insulating member and the first conductive member are in contact to the end of the first region is defined as r1, and the distance between the nonlinear resistance member and the first conductive member is the distance r1. where r2 is the distance from the center of the second region to the end of the second region, 0.8r1 ≤ r2 ≤ r1 ;
A spacer, wherein the insulating member, the first conductive member, and the non-linear resistance member are arranged such that the center of the first region coincides with the center of the second region. 5. A spacer according to claim 4,
A spacer, characterized in that 0.980r1≤r2≤0.995r1. a grounded container connected to ground potential;
a conductive member provided inside the grounding container and to which a high voltage is applied;
a spacer that supports the conductive member inside the ground container;
The spacer has an insulating member joined to the conductive member at one end and joined to the grounding container at the other end, and a nonlinear resistance member disposed within the insulating member in contact with the conductive member. death,
The distance from the center of the first region where the insulating member and the conductive member are in contact to the end of the first region is defined as r1, and the center of the second region where the nonlinear resistance member and the conductive member are in contact. 0.8 r1 ≤ r2 ≤ r1, where r2 is the distance from the end of the second region,
The insulating device, wherein the insulating member, the conductive member, and the non-linear resistance member are arranged such that the center of the first region and the center of the second region are aligned. 7. The insulating device according to claim 6,
An insulating device, characterized in that 0.980r1≤r2≤0.995r1.

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