Functional composite post insulator

Abstract

The utility model relates to a functional composite post insulator, which is mounted between two compartments of a switch cabinet and comprises an insulating main body, a conductor, a threaded insert, a shielding cover and a grading ring, so that the insulating main body is made of insulating materials, a mounting axis is arranged in the insulating main body, the conductor is used for connecting a static contact or a leading-out wire, and the threaded insert is used for connecting the shielding cover and the grading ring. The conductor, the shielding cover and the grading ring are coaxially installed in the insulation body with an installation axis as the axis, the grading ring is connected with the outer side wall of the lower end of the conductor in a sleeved mode, the shielding cover is arranged on the outer side of the grading ring, the shielding cover and the grading ring are arranged at intervals, the interval is filled with insulation materials, and an installation plate is arranged on the outer side wall of the insulation body. The threaded insert is installed on the installation plate in an embedded mode and connected with the shielding cover through a wire. The problem that a false CT structure is adopted in a current transformer-free scheme in a longitudinal rotation type switch cabinet is solved, the excessive waste of insulating materials and the cost increase are reduced, and the overall weight of the switch cabinet is reduced.

Description

Technical Field

[0001] This utility model relates to the field of switchgear, and in particular to a functional composite post insulator. Background Technology

[0002] In power systems, switchgear is a key device for power distribution, control, and protection. Switchgear is mainly divided into two categories: floor-standing switchgear and rotary withdrawable switchgear. These two types of switchgear differ significantly in their structural design. The current transformer in rotary withdrawable switchgear is a multi-functional device, combining the functions of a current transformer, electrical connection between different compartments, and installation of the stationary contact of a disconnector switch.

[0003] In practical applications, not all primary circuits require actual current transformers. For example, in specific applications such as PTs and disconnecting isolation cabinets, these cabinets do not need to have actual current transformer coils installed inside. However, to maintain uniformity with standard designs and aesthetic consistency, these cabinets often still adopt the same external structure as traditional current transformers, the so-called "pseudo-CTs." While this approach facilitates unified management and maintenance during design, production, and installation, it also leads to unnecessary waste of insulation materials and increased costs. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned technical problems and provide a functional composite post insulator. This application aims to solve the problem of using a "pseudo-CT" structure in the scheme without current transformer in the longitudinal rotary switchgear, thereby reducing the waste of insulation materials and the increase in cost, and reducing the overall weight of the switchgear.

[0005] A functional composite post insulator is installed between two compartments of a switchgear. It includes an insulating body, a conductor, a threaded insert, a shield, and an equalizing ring. The insulating body is made of insulating material and has an installation axis. The conductor is used to connect a stationary contact or a lead wire. The conductor, shield, and equalizing ring are coaxially installed within the insulating body, with the installation axis as the axis. The equalizing ring is fitted onto the outer wall of the lower end of the conductor. The shield is positioned outside the equalizing ring, and the shield and equalizing ring are spaced apart, with the space filled with the insulating material. The insulating body has an installation plate on its outer wall, and the threaded insert is pre-embedded on the installation plate. The threaded insert is connected to the shield via a wire.

[0006] According to this application, the functional composite post insulator, through functional integration, solves the integrity and protection level requirements of each compartment for cabinets without current transformers in the primary circuit, such as PT cabinets and disconnecting cabinets. It serves as a support for the static contacts of the circuit breaker with isolation function, and also as a product that electrically connects two compartments. It is small in size and light in weight, reducing the amount of epoxy material used and lowering costs. The shield and threaded insert are connected by wires, which facilitates the grounding of the shield. When the conductor is energized, the insulation performance of the post insulator changes from external air insulation performance to insulation performance within the insulation body. The insulation performance between the conductor and the shield is entirely borne by the insulation material, which improves the insulation performance of the post insulator and reduces the phenomenon of ionization flashover on the outer surface of the post insulator. The setting of the equalizing ring can improve the electric field distribution inside the insulation body, reduce the phenomenon of electric field concentration at the intersection of the three interfaces, and improve the overall insulation level of the post insulator.

[0007] Furthermore, the mounting plate is disposed in the middle of the insulating body, and the insulating body has an upper cylinder and a lower cylinder formed on both the upper and lower sides of the mounting plate. The conductor is installed in the upper cylinder, and the lower end of the conductor is fixed in the middle of the insulating body.

[0008] Furthermore, the lower cylinder contains a cylindrical cavity, which is smaller at the top and larger at the bottom.

[0009] Furthermore, the outer surfaces of the upper and lower cylinders are provided with multiple spaced-apart skirts of varying sizes. These skirts are used to increase the creepage distance.

[0010] Furthermore, the top surface of the upper cylinder is provided with a square tray, and the top surface of the square tray is provided with multiple rings of spaced-apart closed umbrella skirts. The closed umbrella skirts increase the surface creepage distance between the live parts of the compartment above the square tray and the ground.

[0011] Furthermore, the conductor has end faces at both ends that expose the insulating body, and these end faces have connection holes. The connection holes are used to connect external stationary contacts or lead wires.

[0012] Furthermore, the mounting plate is a square mounting plate, and threaded inserts are pre-embedded at each of the four corners of the mounting plate.

[0013] Furthermore, the insulating material is epoxy resin. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the functional composite post insulator of this utility model.

[0015] Figure 2 This is a partial cross-sectional view of the functional composite post insulator of this utility model.

[0016] Figure 3 This is a bottom view of the functional composite post insulator of this utility model.

[0017] Figure 4 This is a top view of the functional composite post insulator of this utility model. Detailed Implementation

[0018] The present invention relates to a functional composite post insulator, illustrated in conjunction with the accompanying drawings.

[0019] like Figures 1 to 4 The diagram illustrates a functional composite post insulator installed between two compartments of a switchgear. It includes an insulating body 2, a conductor 1, a threaded insert 5, a shielding cover 4, and an equalizing ring 3. The insulating body 2 is made of insulating material and has an installation axis. The conductor 1 is used to connect stationary contacts or leads. The conductor 1, shielding cover 4, and equalizing ring 3 are coaxially installed within the insulating body 2, with the installation axis as the axis. The equalizing ring 3 is fitted onto the outer wall of the lower end of the conductor 1. The shielding cover 4 is positioned outside the equalizing ring 3. The shielding cover 4 and equalizing ring 3 are spaced apart, with the space filled with the insulating material, which is epoxy resin. The conductor 1 can be made of... Made of copper or copper alloy, the insulating body 2 has an mounting plate 7 on its outer wall. The threaded insert 5 is pre-embedded on the mounting plate 7. The threaded insert 5 is connected to the shielding cover 4 by a wire 6. The threaded insert 5 is fixed to the metal partition 14 of the switch cabinet by a metal screw. The shielding cover 4 is connected to the threaded insert 5 by a wire 6, so that the shielding cover 4 can be grounded through the connection structure with the switch cabinet. When the conductor 1 is energized, the insulation performance of the post insulator changes from the external air insulation performance to the insulation performance inside the insulating body 2. The insulation performance between the conductor 1 and the shielding cover 4 is completely borne by the insulating material, which improves the insulation performance of the post insulator and reduces the ionization flashover phenomenon of the air on the outer surface of the post insulator.

[0020] like Figure 1 and Figure 2 As shown, the mounting plate 7 is disposed in the middle of the insulating body 2. The insulating body 2 has an upper cylinder 11 and a lower cylinder 10 formed on both the upper and lower sides of the mounting plate 7. The upper cylinder 11 is housed in the compartment on the upper side of the metal partition 14, and the lower cylinder 10 is housed in the compartment on the lower side of the metal partition 14. The conductor 1 is installed in the upper cylinder 11, and the lower end of the conductor 1 is fixed in the middle of the insulating body 2, so that the shielding cover 4 and the equalizing ring 3 are disposed in the middle of the insulating body 2, thereby facilitating the connection between the threaded insert 5 and the shielding cover 4 through the wire 6.

[0021] like Figure 1As shown, the lower cylinder 10 has a cylindrical cavity 9 inside, which is shaped like a smaller top and a larger bottom. The equalizing ring 3 is in close contact with the lower end of the conductor 1. The equalizing ring 3 can improve the electric field distribution inside the cylindrical cavity 9, reduce the phenomenon of electric field concentration at the intersection of the three interfaces, and improve the overall insulation level of the post insulator.

[0022] like Figure 2 and Figure 4 As shown, the outer surfaces of the upper cylinder 11 and the lower cylinder 10 are provided with multiple spaced-apart skirts 8 of varying sizes. The top surface of the upper cylinder 11 is provided with a square tray 12, and the top surface of the square tray 12 is provided with multiple spaced-apart closed skirts 15. The skirts 8 can increase the creepage distance, while the closed skirts 15 can increase the surface creepage distance between the live parts of the compartments above the square tray 12 and the ground.

[0023] like Figure 1 , Figure 3 as well as Figure 4 As shown, the conductor 1 has end faces that protrude from the insulating body 2 at both ends. The end faces are provided with connection holes 13, which are threaded connection holes 13. The connection holes 13 are used to connect external stationary contacts or lead wires. The post insulator can pre-embed conductors 1 of different diameters according to different currents to achieve the diversity of post insulator specifications.

[0024] like Figure 3 or Figure 4 As shown, the mounting plate 7 is a square mounting plate 7, and threaded inserts 5 are pre-embedded at the four corners of the mounting plate 7 to facilitate the stable fixing of the post insulator to the metal partition plate 14.

[0025] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A functional composite post insulator, characterized in that, The post insulator is installed between two compartments of the switchgear and includes an insulating body, a conductor, a threaded insert, a shield, and an equalizing ring. The insulating body is made of insulating material and has an installation axis. The conductor is used to connect a stationary contact or a lead wire. The conductor, shield, and equalizing ring are coaxially installed in the insulating body with the installation axis as the axis. The equalizing ring is sleeved on the outer wall of the lower end of the conductor. The shield is located outside the equalizing ring, and the shield and equalizing ring are spaced apart, with the space filled with the insulating material. The insulating body has an installation plate on its outer wall, and the threaded insert is pre-embedded on the installation plate. The threaded insert is connected to the shield via a wire.

2. The functional composite post insulator according to claim 1, characterized in that, The mounting plate is disposed in the middle of the insulating body. The insulating body has an upper cylinder and a lower cylinder formed on both the upper and lower sides of the mounting plate. The conductor is installed in the upper cylinder, and the lower end of the conductor is fixed in the middle of the insulating body.

3. The functional composite post insulator according to claim 2, characterized in that, The lower cylinder has a cylindrical cavity, which is smaller at the top and larger at the bottom.

4. The functional composite post insulator according to claim 2, characterized in that, The outer surfaces of the upper and lower cylinders are provided with multiple umbrella skirts of different sizes spaced apart.

5. The functional composite post insulator according to claim 2, characterized in that, The top surface of the upper cylinder is provided with a square tray, and the top surface of the square tray is provided with a closed umbrella skirt with multiple rings spaced apart.

6. The functional composite post insulator according to claim 1, characterized in that, The conductor has end faces at both ends that expose the insulating body, and the end faces are provided with connection holes.

7. The functional composite post insulator according to claim 1, characterized in that, The mounting plate is a square mounting plate, and threaded inserts are pre-embedded at each of the four corners of the mounting plate.

8. The functional composite post insulator according to claim 1, characterized in that, The insulating material is epoxy resin.

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