Three-phase three-column type support insulator for gas-insulated transmission line

Abstract

The three-phase, three-post supported insulator for gas-insulated transmission lines disclosed herein includes: an insulating body comprising three conductor sheaths spaced apart circumferentially; three connecting posts disposed between adjacent conductor sheaths and connecting them; and three legs disposed at the outer edge of each conductor sheath and extending radially along the insulating body; three conductor bushings extending axially along the insulating body and penetrating the three conductor sheaths; and three leg inserts embedded in the three legs. The insulating body includes three conductor sheaths connected by connecting posts, each leg disposed at the outer edge of a conductor sheath, and conductor bushings penetrating the conductor sheaths. This structure not only reduces the weight of the insulator but also allows the conductor of the lowest phase to maintain a certain distance from the casing, thereby reducing the risk of discharge.

Description

Technical Field

[0001] This utility model relates to the field of high voltage / ultra-high voltage power transmission, specifically to a three-phase three-column support insulator for gas-insulated transmission lines. Background Technology

[0002] To adapt to complex engineering environments, gas-insulated transmission lines are installed in various ways, including horizontal, inclined shaft, and vertical shaft installations. To meet the changing requirements of electric field stress, thermal stress, and mechanical stress during operation due to variations in load and surrounding environment, insulators with different structural designs are used in different scenarios, especially in three-phase co-enclosure designs. Since the three-phase conductors are arranged within the same gas-insulated metal shell, different installation scenarios place different demands on the supporting insulators. Multi-purpose supporting insulators suitable for various scenarios can effectively reduce the number of insulator types, lower insulator manufacturing costs, and improve the operational stability and lifespan of the entire system.

[0003] Existing three-post support insulators are implemented by removing some material and adding legs to a plate insulator. A typical design is the three-phase three-post insulator disclosed in CN211455407U. This insulator uses an alternating arrangement of conductors and legs, resulting in a relatively heavy overall weight. Furthermore, the conductor of the lowest phase is close to the shell, leading to a high electric field strength at the bottom surface of the shell. Particles located at the bottom of the shell are easily lifted by the electric field and moved towards the high-field-strength region of the conductor, increasing the risk of discharge. Another type of three-post insulator, disclosed in CN218996445U, has a convex distribution of the conductor coverage area and three legs, with an overall axial cross-section resembling a triangle with three concave sides and a large cross-sectional area. If used in shaft installations, this can easily lead to particle accumulation, reducing the surface withstand voltage performance of the insulator and increasing the risk of surface flashover. Utility Model Content

[0004] To address at least one technical problem in the prior art, this utility model provides a three-phase, three-column supported insulator for gas-insulated transmission lines.

[0005] The three-phase three-post support insulator for gas-insulated transmission lines provided by this utility model includes: an insulating body, which includes three conductor-covered portions spaced apart from each other in the circumferential direction; three connecting posts respectively disposed between adjacent conductor-covered portions and connecting adjacent conductor-covered portions; and three legs respectively disposed on the outer edge of each conductor-covered portion and extending radially along the insulating body; three conductor bushings extending axially along the insulating body and passing through the three conductor-covered portions; and three leg inserts respectively embedded in the three legs.

[0006] The insulation body includes three conductor-covered sections connected by connecting posts. Each leg is located on the outer edge of the conductor-covered section, and the conductor bushing passes through the conductor-covered section. This structure not only reduces the weight of the insulator, but also allows the lowest phase conductor to maintain a certain distance from the shell, thereby reducing the risk of discharge.

[0007] In some embodiments, the conductor bushing and the legs corresponding to the conductor sheath are aligned radially in the insulating body. Because the conductor bushing and the legs corresponding to the conductor sheath are aligned radially in the insulating body, a certain distance is maintained between the conductor bushing and the casing of the gas-insulated transmission line, reducing the risk of line discharge.

[0008] In some embodiments, the center of the insulating body has a hole surrounded by three connecting posts. The hollowed-out structure at the center of the insulating body reduces the amount of material used and lowers its weight.

[0009] In some implementations, the connections between the legs and connecting posts, as well as the connections between the conductor sheath and the legs, are smoothly transitioned using rounded arcs. These rounded transitions optimize the electric field distribution at the connection points and reduce the risk of partial discharge.

[0010] In some implementations, the outer surface of the connecting post extends from both ends toward the middle and gradually tapers toward the central axis. This means the connecting post has a dumbbell shape that is thinner in the middle. This shape optimizes the electric field distribution on the surface of the connecting post and reduces the risk of discharge.

[0011] In some implementations, the legs taper gradually towards the middle, creating a concave region in the middle area of ​​the legs. This concave region in the middle of the legs optimizes the electric field distribution on the leg surface and reduces the risk of discharge during insulator use. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 A perspective view of a three-phase, three-column supported insulator for a gas-insulated transmission line according to some embodiments of the present disclosure is shown.

[0014] Figure 2A cross-sectional view of a three-phase, three-column supported insulator for a gas-insulated transmission line, perpendicular to the insulator's axial direction, is shown in some embodiments of this disclosure.

[0015] Figure 3 It shows Figure 2 A magnified view of the middle support leg.

[0016] Symbol explanation:

[0017] 1. Insulating body

[0018] 2. Conductor bushing

[0019] 3. Leg inserts

[0020] 11. Conductor sheath

[0021] 12. Connecting column

[0022] 121. Concave area

[0023] 13. Support leg

[0024] 4. Hole Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] According to one aspect of this disclosure, a three-phase, three-post supported insulator for gas-insulated transmission lines is provided. Please refer to... Figure 1 and Figure 2 The insulator includes an insulating body 1, three conductor bushings 2, and three leg inserts 3.

[0028] The insulating body 1 is made of insulating material. For example, the insulating body 1 can be integrally cast from epoxy resin.

[0029] The insulating body 1 includes three conductor-covered portions 11, three connecting posts 12, and three legs 13. More specifically, the three conductor-covered portions 11 are spaced apart from each other in the circumferential direction of the insulating body 1, and the three connecting posts 12 are respectively disposed between adjacent conductor-covered portions 11 and connect adjacent conductor-covered portions 11. The three conductor-covered portions 11 are arranged in a triangle and are connected by the connecting posts 12. The center of the insulating body 1 has a hole 4 surrounded by the conductor-covered portions 11 and the connecting posts 12. This structure can save materials and has greater strength.

[0030] Three legs 13 are respectively disposed on the outer edge of the three conductor sheaths 11. More specifically, the legs 13 extend radially away from the center of the insulating body 1. Each leg 13 has a leg insert 3 at its end, which positions and installs the insulator on the inner wall of the gas-insulated transmission line housing, thereby supporting the insulator within the housing.

[0031] In some embodiments, the connections between the conductor sheath 11 and the connecting post 12, and between the conductor sheath 11 and the support leg 13, are made with a smooth arc transition. This smooth arc transition optimizes the electric field distribution at the connection point and reduces the risk of partial discharge.

[0032] Three conductor bushings 2 extend along the axial direction of the insulating body 1 and penetrate the insulating body 1, and are distributed circumferentially at intervals. The three conductor bushings 2 are arranged in a triangle and can penetrate the three conductor covering portions 11 respectively, that is, each conductor covering portion 11 covers one conductor bushing 2.

[0033] The insulating body of this utility model includes three conductor-covered parts 11, which are connected by connecting posts 12. Each conductor-covered part 11 has a support leg 13 on its outer edge and is penetrated by a conductor bushing 2. This structure not only reduces the weight of the insulator, but also allows the conductor of the lowest phase to maintain a certain distance from the shell, thereby reducing the risk of discharge.

[0034] The support leg 13, leg insert 3, conductor sheath 11, and conductor bushing 2 are aligned radially on the insulator. The conductor sheaths 11 are connected by connecting posts 12, which optimizes the field strength distribution of the insulator.

[0035] The conductor bushing 2 and the legs 13 corresponding to the conductor sheath 11 are aligned radially in the insulating body 1. More specifically, the center of the conductor bushing 2 and the central axis of the legs 13 are aligned radially in the insulating body 1. Because the conductor bushing 2 and the legs 13 corresponding to the conductor sheath 11 are arranged radially in the insulating body 1, a certain distance can be maintained between the conductor bushing 2 and the casing of the gas-insulated transmission line, thereby reducing the risk of line discharge.

[0036] In some embodiments, the outer surface of the connecting post 12 extends from both ends of the connecting post 12 toward the middle and gradually tapers toward the central axis of the connecting post 12. The connecting post 12 and the conductor covering portion 11 have a gradual transition, and the connecting post 12 is dumbbell-shaped, thinner in the middle than at both ends. The conductor covering portions 11 are connected by the connecting post 12. This shape optimizes the electric field distribution on the surface of the connecting post 12 and reduces the risk of discharge.

[0037] In some embodiments, please refer to Figure 3 The support leg 13 gradually tapers from both ends towards the middle, thus forming a concave region 132 in the middle of the support leg 13. The concave region in the middle of the support leg optimizes the electric field distribution on the surface of the support leg and reduces the risk of discharge during the use of the insulator.

[0038] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments 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 utility model should be included within the protection scope of the present utility model.

Claims

1. A three-phase three-column type support insulator for a gas-insulated power transmission line, characterized by, include: An insulating body includes three conductor-covered portions spaced apart from each other in a circumferential direction, three connecting posts respectively disposed between adjacent conductor-covered portions and connecting adjacent conductor-covered portions, and three legs respectively disposed on the outer edge of each conductor-covered portion and extending radially along the insulating body; Three conductor bushings extend along the axial direction of the insulating body and penetrate the three conductor covering portions respectively; as well as Three leg inserts are respectively embedded in the three legs.

2. The three-phase, three-column supported insulator for gas-insulated transmission lines according to claim 1, characterized in that, The conductor bushing and the legs corresponding to the conductor covering are aligned radially in the insulating body.

3. The three-phase, three-column supported insulator for gas-insulated transmission lines according to claim 1, characterized in that, The insulating body has a hole at its center surrounded by the three connecting posts.

4. The three-phase, three-column supported insulator for gas-insulated transmission lines according to claim 1, characterized in that, The connection between the support leg and the connecting column is a smooth, rounded transition.

5. The three-phase, three-column supported insulator for gas-insulated transmission lines according to claim 1, characterized in that, The outer surface of the connecting post extends from both ends toward the middle and gradually converges toward the central axis of the connecting post.

6. The three-phase, three-column supported insulator for gas-insulated transmission lines according to claim 1, characterized in that, The two ends of the support leg gradually taper towards the middle, thus forming a concave area in the middle region of the support leg.

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