A support insulator, an insulating support structure and a DC GIL

Abstract

The present application belongs to the field of direct current transmission, and particularly relates to a support insulator, an insulating support structure and a direct current GIL. In order to solve the technical problem that the electric field lines pass through the support insulator in the prior art, resulting in that the normal field intensity of the side surface of the support insulator is too large, the present application provides a support insulator, which comprises a high-potential support surface for supporting a conductive rod, a low-potential support surface for supporting an insulating cylinder and a side surface, the high-potential support surface and the low-potential support surface are both arc surfaces, the axis of the high-potential support surface and the low-potential support surface corresponds to the axis of the matched conductive rod, and the extension line of the projection of the side surface of the support insulator in the direction of the axis of the corresponding conductive rod intersects with the axis of the conductive rod. The present application further provides an insulating support structure and a direct current GIL using the support insulator. By making the electric field lines parallel to the side surface of the support insulator, the normal field intensity of the side surface of the support insulator can be reduced, and the surface flashover voltage and the insulating strength of the support insulator can be improved.

Description

Technical Field

[0001] This invention belongs to the field of DC power transmission, and in particular relates to a supporting insulator, an insulating support structure, and a DC GIL. Background Technology

[0002] In DC GIL, a large normal field strength in the support insulator will have two adverse effects: First, surface charge will accumulate on the surface of the support insulator, which will increase the local electric field strength of the support insulator and thus reduce the insulation strength of the post insulator; Second, the normal field strength will cause metal particles to be adsorbed on the surface of the post insulator, reducing the insulation distance of the post insulator and thus reducing the insulation strength of the post insulator.

[0003] The design goal of DC GIL support insulators is to minimize the normal field strength on the surface of the support insulator, reduce the amount of surface charge, and improve the overall insulation strength of DC GIL. This will increase the surface flashover voltage of the post insulator to a level as close as possible to the breakdown voltage of the pure gas gap, so that the insulation breakdown occurs in the gas medium rather than along the surface of the insulator.

[0004] In existing technologies, the outer surface of the conductive rod and the inner surface of the insulating cylinder are generally cylindrical, with electric field lines pointing from the high-potential conductive rod to the low-potential insulating cylinder. Furthermore, the supporting insulators in existing technologies are often cylindrical structures. For example... Figure 5-6 As shown, because the supporting insulator is a cylindrical structure, some electric field lines pointing from the conductive rod to the insulating cylinder will enter the supporting insulator from the conductive rod, travel a certain distance, and then exit from the side of the supporting insulator, eventually reaching the insulating cylinder. Since some electric field lines exit from the side of the supporting insulator, these lines have a normal component perpendicular to the side of the supporting insulator. This results in an excessively large normal field strength on the side of the supporting insulator, leading to a decrease in the insulation strength of the supporting insulator and failing to meet the design objectives. Summary of the Invention

[0005] The purpose of this invention is to provide a supporting insulator, an insulating support structure, and a DC GIL to solve the technical problem in the prior art where electric field lines pass through the supporting insulator, resulting in excessive normal field strength on the side of the supporting insulator.

[0006] To achieve the above objectives, the technical solution for the supporting insulator provided by this invention is as follows:

[0007] A supporting insulator includes a high-potential supporting surface for supporting a conductive rod, a low-potential supporting surface for supporting an insulating cylinder, and a side surface. The high-potential supporting surface and the low-potential supporting surface are both arc-shaped surfaces. The axes of the high-potential supporting surface and the low-potential supporting surface correspond to the axis of the matching conductive rod. The extension line of the projection of the side surface of the supporting insulator onto the axis of the corresponding conductive rod intersects the axis of the conductive rod.

[0008] The beneficial effects are as follows: This invention is an improved invention. After the supporting insulator is installed on the conductive rod, the centers of the high-potential and low-potential supporting surfaces of the supporting insulator are the same in the cross-section along the radial direction of the conductive rod, and the extension lines of the sides all pass through this center. At the same time, this center is located on the axis of the conductive rod corresponding to the supporting insulator. This ensures that inside the supporting insulator, the electric field lines from the conductive rod to the insulating cylinder directly penetrate the supporting insulator and do not exit from the side of the supporting insulator; on the side of the supporting insulator, the electric field lines from the conductive rod to the insulating cylinder are parallel to the side of the supporting insulator; outside the supporting insulator, the electric field lines from the conductive rod to the insulating cylinder neither enter nor exit the supporting insulator, thereby reducing the normal electric field strength on the side of the supporting insulator and increasing the surface flashover voltage and insulation strength of the supporting insulator.

[0009] Furthermore, the sides of the supporting insulator are smoothly connected to the high-potential support surface and the low-potential support surface.

[0010] The beneficial effect is that by smoothly connecting the side surface to the support surface, the occurrence of tip discharge can be avoided.

[0011] Furthermore, the high-potential support surface is provided with a first insert for fixing the support insulator to the conductive rod, and the low-potential support surface is provided with a second insert, the center line connecting the first insert and the second insert coincides with a radius of the corresponding conductive rod.

[0012] The beneficial effects are as follows: by setting the first insert, the post insulator can be easily installed on the conductive rod; by setting the second insert, other structures can be easily installed on the low-potential support surface; by making the center line connecting the first insert and the second insert coincide with a radius of the corresponding conductive rod, the influence of the insert on the normal electric field of the side of the support insulator can be avoided as much as possible.

[0013] To achieve the above objectives, the technical solution of the insulating support structure provided by the present invention is as follows:

[0014] An insulating support structure includes a mounting cylinder for fixing an electrical connection to a conductive rod and a supporting insulator mounted on the insulating cylinder. The supporting insulator includes a high-potential supporting surface for supporting the conductive rod, a low-potential supporting surface for supporting the insulating cylinder, and a side surface. Both the high-potential and low-potential supporting surfaces are arc-shaped surfaces. The axes of the high-potential and low-potential supporting surfaces correspond to the axis of the matching conductive rod. The extension line of the projection of the side surface of the supporting insulator onto the axis of the corresponding conductive rod intersects the axis of the conductive rod. The mounting cylinder is a conductor, and the axis of the mounting cylinder is designed to coincide with the axis of the conductive rod corresponding to the mounting cylinder.

[0015] The beneficial effects are as follows: This invention is an improved invention. By setting up the mounting cylinder, it is easy to install the supporting insulator on the conductive rod. At the same time, the axis of the mounting cylinder coincides with the axis of the conductive rod, which can avoid the influence of the mounting cylinder on the electric field, and make the electric field from the mounting cylinder to the insulating cylinder in the same direction as the electric field from the conductive rod to the insulating cylinder, thereby ensuring that the normal electric field on the side of the supporting insulator is small and improving the flashover voltage of the supporting insulator.

[0016] Furthermore, the sides of the supporting insulator are smoothly connected to the high-potential support surface and the low-potential support surface.

[0017] The beneficial effect is that by smoothly connecting the side surface to the support surface, the occurrence of tip discharge can be avoided.

[0018] Furthermore, the high-potential support surface is provided with a first insert for fixing the support insulator to the conductive rod, and the low-potential support surface is provided with a second insert, the center line connecting the first insert and the second insert coincides with a radius of the corresponding conductive rod.

[0019] The beneficial effects are as follows: by setting the first insert, the post insulator can be easily installed on the conductive rod; by setting the second insert, other structures can be easily installed on the low-potential support surface; by making the center line connecting the first insert and the second insert coincide with a radius of the corresponding conductive rod, the influence of the insert on the normal electric field of the side of the support insulator can be avoided as much as possible.

[0020] Furthermore, the mounting cylinder is provided with a recess for shielding the electric field at the end of the supporting insulator, and the high-potential supporting surface of the supporting insulator is installed in the recess.

[0021] The beneficial effects are as follows: by setting the recess, the electric field at the end of the supporting insulator can be shielded, reducing the normal field strength on the side of the supporting insulator. At the same time, since the end of the supporting insulator is located in the recess, the surface of the mounting cylinder is higher than the end face of the supporting insulator, thus ensuring that the electric field lines pointing from the surface of the mounting cylinder to the insulating cylinder are not affected by the electric field at the end of the supporting insulator, thereby further reducing the normal field strength on the side of the supporting insulator.

[0022] Furthermore, the mounting cylinder is also provided with a first mounting groove for shielding the electric field of the first insert. The first mounting groove is located in the groove, and the first insert is fixedly installed in the first mounting groove.

[0023] The beneficial effects are as follows: by setting the first mounting groove and fixing the first insert in the first mounting groove, the mounting cylinder can shield the electric field of the first insert, thereby ensuring that the electric field lines pointing from the surface of the mounting cylinder to the insulating cylinder are not affected by the electric field of the first insert, and ultimately ensuring that the normal field strength on the side of the supporting insulator is low.

[0024] To achieve the above objectives, the technical solution for DC GIL provided by this invention is as follows:

[0025] A DC GIL includes an insulating support structure, a conductive rod, a particle trap, and an insulating cylinder. The insulating support structure includes a mounting cylinder for fixing an electrical connection to the conductive rod and a supporting insulator mounted on the insulating cylinder. The supporting insulator includes a high-potential supporting surface for supporting the conductive rod, a low-potential supporting surface for supporting the insulating cylinder, and a side surface. Both the high-potential and low-potential supporting surfaces are arc-shaped, and their axes correspond to the axis of the corresponding conductive rod. The extension line of the projection of the side surface of the supporting insulator onto the axis of the corresponding conductive rod intersects the axis of the conductive rod. The mounting cylinder is a conductor, and its axis is designed to coincide with the axis of the conductive rod corresponding to the mounting cylinder. A second insert is provided on the low-potential supporting surface. The particle trap is fixedly connected to the second insert. The projection of the particle trap along the axis of the conductive rod is arc-shaped, and the axis corresponding to the particle trap coincides with the axis of the conductive rod. The particle trap is a conductor and is electrically connected to the insulating cylinder.

[0026] The beneficial effects are as follows: This invention is an improved invention. The particle trap can capture metal particles inside the insulating cylinder, thereby increasing the flashover voltage of the supporting insulator. By setting the projection of the particle trap along the axis of the conductive rod to an arc shape, and aligning the axis of the particle trap with the axis of the conductive rod, the influence of the particle trap on the electric field can be avoided. This ensures that the electric field direction from the mounting cylinder to the particle trap is the same as the electric field direction from the conductive rod to the insulating cylinder, thus guaranteeing a smaller normal field strength on the side of the supporting insulator and improving the flashover voltage of the supporting insulator. By fixing the particle trap to the second insert, the distance between the particle trap and the insulating cylinder can be effectively increased, thereby increasing the probability of charged particles entering the insulating cylinder and the particle trap, and thus better capturing charged particles.

[0027] Furthermore, the sides of the supporting insulator are smoothly connected to the high-potential support surface and the low-potential support surface.

[0028] The beneficial effect is that by smoothly connecting the side surface to the support surface, the occurrence of tip discharge can be avoided.

[0029] Furthermore, the high-potential support surface is provided with a first insert for fixing the support insulator to the conductive rod, and the low-potential support surface is provided with a second insert, the center line connecting the first insert and the second insert coincides with a radius of the corresponding conductive rod.

[0030] The beneficial effects are as follows: by setting the first insert, the post insulator can be easily installed on the conductive rod; by setting the second insert, other structures can be easily installed on the low-potential support surface; by making the center line connecting the first insert and the second insert coincide with a radius of the corresponding conductive rod, the influence of the insert on the normal electric field of the side of the support insulator can be avoided as much as possible.

[0031] Furthermore, the mounting cylinder is provided with a recess for shielding the electric field at the end of the supporting insulator, and the high-potential supporting surface of the supporting insulator is installed in the recess.

[0032] The beneficial effects are as follows: by setting the recess, the electric field at the end of the supporting insulator can be shielded, reducing the normal field strength on the side of the supporting insulator. At the same time, since the end of the supporting insulator is located in the recess, the surface of the mounting cylinder is higher than the end face of the supporting insulator, thus ensuring that the electric field lines pointing from the surface of the mounting cylinder to the insulating cylinder are not affected by the electric field at the end of the supporting insulator, thereby further reducing the normal field strength on the side of the supporting insulator.

[0033] Furthermore, the mounting cylinder is also provided with a first mounting groove for shielding the electric field of the first insert. The first mounting groove is located in the groove, and the first insert is fixedly installed in the first mounting groove.

[0034] The beneficial effects are as follows: by setting the first mounting groove and fixing the first insert in the first mounting groove, the mounting cylinder can shield the electric field of the first insert, thereby ensuring that the electric field lines pointing from the surface of the mounting cylinder to the insulating cylinder are not affected by the electric field of the first insert, and ultimately ensuring that the normal field strength on the side of the supporting insulator is low.

[0035] Furthermore, the particle trap is provided with a second mounting groove for shielding the electric field of the second insert, and the second insert is fixedly installed in the second mounting groove.

[0036] The beneficial effect is that by setting the second mounting groove, the particle trap can shield the electric field of the second insert, thereby ensuring that the electric field lines pointing from the surface of the mounting cylinder to the particle trap or the insulating cylinder are not affected by the electric field of the second insert, and ultimately ensuring that the normal field strength on the side of the supporting insulator is low.

[0037] Furthermore, the particulate trap comprises two parts, and each part has an outward folded edge at the joint. At least one part of the outward folded edge of the particulate trap is provided with a base plate, and the base plate and the outward folded edge are joined to form a second mounting groove.

[0038] The beneficial effect is that by dividing the particulate trap into two parts, the particulate trap can be easily installed on the second insert after the supporting insulator is installed inside the cylinder.

[0039] Furthermore, the second insert is threadedly connected to the outwardly folded edge.

[0040] The beneficial effect is that by connecting the particulate trap to the side wall of the second insert through the outward folded edge, the particulate trap can still be easily installed and removed after the support insulator is installed in the cylinder. Attached Figure Description

[0041] Figure 1 This is a cross-sectional view along the radial direction of the conductive rod of a specific embodiment 1 of the DC GIL in this invention;

[0042] Figure 2 This is a cross-sectional view along the axial direction of the conductive rod of a specific embodiment 1 of the DC GIL in this invention;

[0043] Figure 3 This is a schematic diagram of the particle trap in a specific embodiment 1 of the DC GIL of the present invention;

[0044] Figure 4 This is a schematic diagram of the mounting tube connection structure of a specific embodiment 1 of the DC GIL in this invention;

[0045] Figure 5 The diagram shows the electric field line distribution in a DC GIL (Gas Inductor Light Source) in the prior art.

[0046] Figure 6 This is a diagram showing the electric field intensity and electric field line distribution at the support insulator in a DC GIL in the prior art;

[0047] Figure 7 This is a diagram showing the electric field distribution of a specific embodiment 1 of the DC GIL in this invention;

[0048] Figure 8 This is a diagram showing the electric field intensity and electric field line distribution at the supporting insulator of a specific embodiment 1 of the DC GIL in this invention;

[0049] Figure 9 This is a diagram showing the normal electric field intensity and electric field line distribution at the supporting insulator of a specific embodiment 1 of the DC GIL in this invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Supporting insulator; 2. Particle trap; 201. Second mounting groove; 202. Mounting hole; 203. Through hole; 3. First fastening bolt; 4. Low potential insert; 5. Second fastening bolt; 6. High potential insert; 7. Third fastening bolt; 8. Mounting cylinder; 801. First mounting groove; 9. Conductive rod. Detailed Implementation

[0052] The present invention will be further described in detail below with reference to the embodiments.

[0053] Specific embodiment 1 of the DC GIL provided by this invention:

[0054] The purpose of this embodiment is to provide a DC GIL that does not require modification of the shape of the supporting insulator according to the shape of the electric field lines and has a small normal field strength on the side of the supporting insulator.

[0055] like Figure 1-4 As shown, this embodiment provides a DC GIL, including a supporting insulator 1, a conductive rod 9, and an insulating cylinder. The supporting insulator 1 is disposed between the conductive rod 9 and the insulating cylinder, and the supporting insulator 1 has a side surface and a high-potential support surface and a low-potential support surface for supporting the conductive rod 9 and the insulating cylinder, respectively. The side surface of the supporting insulator 1 is smoothly connected to the high-potential support surface and the low-potential support surface, thereby preventing the occurrence of tip discharge. Figure 1 As shown, in the cross-section along the radial direction of the conductive rod 9, both the high-potential support surface and the low-potential support surface of the supporting insulator 1 are arc-shaped, and the axis of the arc-shaped surface is the same as the axis of the conductive rod 9. The extension line of the side of the supporting insulator 1 passes through this axis. In this embodiment, the conductive rod 9 is tubular, but in other embodiments, the conductive rod can also be a cylinder or other body of revolution.

[0056] After the supporting insulator is installed on the conductive rod 9, the centers of the high-potential and low-potential supporting surfaces of the supporting insulator 1 are the same in the radial section along the conductive rod 9, and the extension lines of the sides all pass through this center. At the same time, this center is located on the axis of the conductive rod corresponding to the supporting insulator. This ensures that inside the supporting insulator 1, the electric field lines from the conductive rod to the insulating cylinder directly enter the supporting insulator 1 and do not exit from the side of the supporting insulator 1. On the side of the supporting insulator 1, the electric field lines from the conductive rod 9 to the insulating cylinder are parallel to the side of the supporting insulator 1. Outside the supporting insulator 1, the electric field lines from the conductive rod 9 to the insulating cylinder neither enter nor exit the supporting insulator 1, thereby reducing the normal field strength on the side of the supporting insulator and increasing the flashover voltage of the supporting insulator.

[0057] To facilitate the installation of the supporting insulator 1 on the conductive rod 9, this embodiment also includes a mounting cylinder 8 fitted onto the conductive rod 9 and a first insert disposed on the high-potential support surface of the supporting insulator 1. The first insert is a high-potential insert 6. The mounting cylinder 8 is a conductor and is electrically connected to the conductive rod 9. The mounting cylinder 8 is provided with a recess for shielding the electric field at the end of the supporting insulator 1 and a first mounting groove 801 for shielding the electric field of the first insert. The first mounting groove 801 is located in a recess, and the high-potential support surface of the supporting insulator 1 is installed in the recess. The first insert is fixedly installed in the first mounting groove 801. The first insert is fixedly connected to the mounting cylinder 8 by a third fastening bolt 7.

[0058] The mounting cylinder 8 allows the supporting insulator 1 to be conveniently installed between the conductive rod 9 and the insulating cylinder. Since the mounting cylinder 8 is a conductor, it ensures that the electric field lines pointing from the mounting cylinder 8 to the insulating cylinder are parallel to the electric field lines pointing from the conductive rod 9 to the insulating cylinder, thus ensuring a low normal electric field strength on the side of the supporting insulator. By providing a recess and the first mounting groove 801, the mounting cylinder 8 can shield the electric field of the first insert and the end of the supporting insulator 1, thereby ensuring that the electric field lines pointing from the surface of the mounting cylinder 8 to the insulating cylinder are not affected by the electric field at the end of the supporting insulator 1, thus ensuring a low normal electric field strength on the side of the supporting insulator 1 and improving the flashover voltage of the supporting insulator.

[0059] In order to prevent charged particles from adhering to the surface of the supporting insulator and to increase the surface flashover voltage of the supporting insulator, a particle trap 2 is also provided in this embodiment. The particle trap 2 is arranged on both sides of the supporting insulator 1 near the end of the insulating cylinder. The projection of the particle trap 2 along the axis of the conductive rod is arc-shaped, and the axis corresponding to the particle trap coincides with the axis of the conductive rod. A second insert, a low-potential insert 4, is provided on the low-potential support surface of the supporting insulator 1. The particle trap 2 is divided into two parts, and each part has an outward folded edge at its joint. At least a portion of the outward folded edge of the particle trap 2 has a base plate. The base plate and the outward folded edge are joined to form a second mounting groove 201 for shielding the electric field of the second insert. The side of the second insert has a mounting hole 202, and the base plate has a through hole 203. A first fastening bolt 3 is installed in the mounting hole 202 and threadedly connects the second insert to the outward folded edge. A second fastening bolt 5 is installed in the through hole 203 and threadedly connects the second insert to the base plate, thereby fixing the particle trap 2 to the second insert and simultaneously fixing the second insert in the second mounting groove 201. The particle trap 2 is a conductor, and the second insert is electrically connected to the insulating cylinder.

[0060] By using the second insert, the potential of the particle trap 2 is made the same as that of the insulating cylinder, thus eliminating the electric field between the particle trap 2 and the insulating cylinder. This facilitates the capture of charged particles entering the space between the insulating cylinder and the particle trap 2, preventing charged particles from accumulating on the surface of the supporting insulator and thus avoiding surface flashover on the supporting insulator surface. By setting the projection of the particle trap 2 along the axial direction of the conductive rod to an arc shape, the electric field lines pointing from the mounting cylinder 8 to the particle trap 2 are made parallel to the electric field lines pointing from the conductive rod to the insulating cylinder, thereby ensuring a low normal field strength on the side of the supporting insulator 1. By setting the second insert, the particle trap 2 can be positioned in the second... Instead of being placed on the insulating cylinder, the particle trap 2 is placed on the insert, thereby increasing the distance between the particle trap 2 and the insulating cylinder, which in turn increases the probability of charged particles entering the insulating cylinder and the particle trap 2, thus better capturing charged particles; by setting the second mounting groove 201, the particle trap 2 can shield the electric field of the second insert, thereby ensuring that the electric field lines pointing from the surface of the mounting cylinder 8 to the particle trap 2 or the insulating cylinder are not affected by the electric field of the second insert, ultimately ensuring that the normal field strength on the side of the supporting insulator 1 is low; by dividing the particle trap 2 into two parts and threadedly connecting them to the second insert, the particle trap 2 can be easily installed on the second insert after the supporting insulator is installed in the cylinder.

[0061] In existing DC GIL systems, when the supporting insulator is cylindrical, the electric field strength and electric field line distribution are as follows: Figure 5-6 As shown, because the supporting insulator is a cylindrical structure, some electric field lines from the conductive rod to the insulating cylinder will pass through the conductive rod into the supporting insulator, travel a certain distance, and then exit from the side of the supporting insulator, eventually reaching the insulating cylinder. Since some electric field lines exit from the side of the supporting insulator, these lines have a normal component perpendicular to the side of the supporting insulator. This results in an excessively large normal field strength on the side of the supporting insulator, leading to a decrease in the surface flashover voltage of the supporting insulator, which fails to meet the design objectives of the supporting insulator.

[0062] In this embodiment, when the cross-section of the supporting insulator is fan-shaped, the electric field line distribution, total electric field strength, and normal electric field strength are as follows: Figure 7-9 As shown, at this time, the electric field lines emanating from the mounting cylinder 8 are relatively regular. Inside the supporting insulator, the electric field lines pointing from the conductive rod to the insulating cylinder directly penetrate the supporting insulator and do not exit from the side of the supporting insulator. On the side of the supporting insulator, the electric field lines pointing from the conductive rod to the insulating cylinder are parallel to the side of the supporting insulator. Outside the supporting insulator, the electric field lines pointing from the conductive rod to the insulating cylinder neither enter nor exit the supporting insulator. This effectively reduces the normal field strength on the side of the supporting insulator, and the difference in normal field strength at different positions on the side of the supporting insulator is much smaller than in the prior art, thereby reducing the maximum value of the normal field strength and increasing the surface flashover voltage of the supporting insulator.

[0063] Specific embodiment 2 of the DC GIL provided by the present invention:

[0064] The purpose of this embodiment is to provide a different installation method for supporting insulators. The main difference between this embodiment and specific embodiment 1 is that: in this embodiment, the mounting cylinder is not included, and a central electrode is set as in the background art. In this case, the central electrode is cylindrical or cylindrical, rather than an irregularly shaped central electrode, and the centers of the two supporting surfaces of the supporting insulator are on the extension line of the axis of the conductive rod.

[0065] Specific embodiment 3 of the DC GIL provided by the present invention:

[0066] The purpose of this embodiment is to provide another different installation method for the support insulator. The main difference between this embodiment and specific embodiment 1 is that: in this embodiment, the mounting cylinder does not include a recess and a first mounting groove, the support insulator does not include a first insert, and the support insulator is bonded to the first mounting groove.

[0067] Specific embodiment 4 of the DC GIL provided by this invention:

[0068] The purpose of this embodiment is to provide a DC GIL that does not include a particulate trap. The main difference between this embodiment and specific embodiment 1 is that in this embodiment, the DC GIL does not include a particulate trap.

[0069] Specific embodiment 5 of the DC GIL provided by the present invention:

[0070] The purpose of this embodiment is to provide a particle trap with a different shape. The main difference between this embodiment and specific embodiment 1 is that in this embodiment, the particle trap is plate-shaped.

[0071] Specific embodiment 6 of the DC GIL provided by the present invention:

[0072] The purpose of this embodiment is to provide a different installation method for a particulate trap. The main difference between this embodiment and specific embodiment 1 is that in this embodiment, the DC GIL does not include a second insert, and the particulate trap is bonded to a supporting insulator or insulating cylinder.

[0073] Specific embodiment 7 of the DC GIL provided by the present invention:

[0074] The purpose of this embodiment is to provide a different connection method between the particulate trap and the second insert. The main difference between this embodiment and specific embodiment 1 is that in this embodiment, the second mounting slot is not included, and the particulate trap is directly bonded to the second insert.

[0075] Specific embodiment 8 of the DC GIL provided by this invention:

[0076] The purpose of this embodiment is to provide a particulate trap with a different structure. The main difference between this embodiment and specific embodiment 1 is that in this embodiment, the particulate trap is integrally formed. First, the particulate trap is installed on the supporting insulator outside the insulating cylinder, and then the supporting insulator is installed on the mounting cylinder.

[0077] Specific embodiment 9 of the DC GIL provided by the present invention:

[0078] The purpose of this embodiment is to provide a different grounding method for a particulate trap. The main difference between this embodiment and specific embodiment 1 is that in this embodiment, the particulate trap and the insulating cylinder are electrically connected through a grounding electrode.

[0079] Specific embodiment 10 of the DC GIL provided by the present invention:

[0080] The purpose of this embodiment is to provide a different type of support insulator. The main difference between this embodiment and specific embodiment 1 is that in this embodiment, the side of the support insulator is not smoothly connected to the high-potential support surface and the low-potential support surface, but is shielded from the electric field at the high-potential support surface and the low-potential support surface by a mounting cylinder and a particle trap.

[0081] Specific embodiment 1 of the supporting insulator provided by the present invention:

[0082] The purpose of this embodiment is to provide a support insulator with a high flashover voltage. The specific scheme of this embodiment is the same as the structure of any of the support insulators in the specific embodiments 1-10 of DC GIL, and will not be described again here.

[0083] Specific embodiment 1 of the insulating support structure provided by the present invention:

[0084] The purpose of this embodiment is to provide an insulation support structure with a high flashover voltage. The specific scheme of this embodiment is the same as any of the insulation support structures in the specific embodiments 1-10 of DC GIL, and will not be described again here.

[0085] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A supporting insulator, comprising a high-potential supporting surface for supporting a conductive rod, a low-potential supporting surface for supporting an insulating cylinder, and a side surface, characterized in that, Both the high-potential support surface and the low-potential support surface are arc-shaped surfaces. The axes of the high-potential support surface and the low-potential support surface correspond to the axis of the matching conductive rod. The extension line of the projection of the side of the supporting insulator onto the axis of the corresponding conductive rod intersects the axis of the conductive rod.

2. The supporting insulator as described in claim 1, characterized in that, The sides of the supporting insulator are smoothly connected to the high-potential support surface and the low-potential support surface.

3. The supporting insulator as described in claim 1 or 2, characterized in that, The high-potential support surface is provided with a first insert for fixing the support insulator to the conductive rod, and the low-potential support surface is provided with a second insert. The center line connecting the first insert and the second insert coincides with a radius of the corresponding conductive rod.

4. An insulating support structure, characterized in that, It includes a mounting cylinder for fixing an electrical connection to a conductive rod and a supporting insulator mounted on an insulating cylinder, wherein the supporting insulator is any one of claims 1-3, the mounting cylinder is a conductor, and the axis of the mounting cylinder coincides with the axis of the corresponding conductive rod.

5. The insulating support structure as described in claim 4, characterized in that, The mounting cylinder has a recess for shielding the electric field at the end of the supporting insulator, and the high-potential supporting surface of the supporting insulator is installed in the recess.

6. The insulating support structure as described in claim 5, characterized in that, The mounting cylinder is also provided with a first mounting groove for shielding the electric field of the first insert. The first mounting groove is located in the groove, and the first insert is fixedly installed in the first mounting groove.

7. A DC GIL, comprising an insulating support structure, a conductive rod, a particle trap, and an insulating cylinder, characterized in that, The insulating support structure is any one of claims 4-6. A second insert is provided on the low-potential support surface. The particle catcher is fixedly connected to the second insert. The projection of the particle catcher along the axis of the conductive rod is arc-shaped, and the axis corresponding to the particle catcher coincides with the axis of the conductive rod. The particle catcher is a conductor and is electrically connected to the insulating cylinder.

8. The DC GIL as described in claim 7, characterized in that, The particle trap is provided with a second mounting slot for shielding the electric field of the second insert, and the second insert is fixedly installed in the second mounting slot.

9. The DC GIL as described in claim 8, characterized in that, The particulate trap comprises two parts, and each part has an outward folded edge at the joint. At least a portion of the outward folded edge of the particulate trap is provided with a base plate, and the base plate and the outward folded edge are joined to form a second mounting groove.

10. The DC GIL as described in claim 9, characterized in that, The second insert is threadedly connected to the outward-folded flange.

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