Composite insulator capable of improving breakdown voltage

Abstract

The utility model discloses a composite insulator capable of improving breakdown voltage, which belongs to the technical field of insulators, and comprises a steel pin, a porcelain piece arranged on the steel pin, a steel cap arranged on the porcelain piece, and an anti-breakdown mechanism arranged on the upper part of the porcelain piece, so that the local field intensity of the steel cap and the steel pin can be reduced, and the overall withstand voltage level of the insulator is improved. Faults caused by partial discharge or electric breakdown are reduced, and the overall breakdown failure of the insulator is avoided.

Description

Technical Field

[0001] This invention belongs to the field of insulator technology, specifically a composite insulator that improves breakdown voltage. Background Technology

[0002] Suspension porcelain insulators are widely used in high-voltage transmission lines and power equipment. Their main function is to support conductors and provide electrical insulation. However, due to the structural characteristics of suspension porcelain insulators, the electric field at the steel cap and steel foot often concentrates under high voltage. Both the steel cap and steel foot are conductors, while the main material of the insulator is porcelain dielectric. The difference in dielectric constant between the two is large, which causes the electric field to change abruptly at the interface. The geometric structure of the steel cap and steel foot usually has a small radius of curvature. According to the edge effect principle, the electric field tends to concentrate at sharp corners or parts with small curvature, resulting in a local electric field intensity that is much higher than other parts of the insulator.

[0003] Currently, in high-voltage transmission systems, the voltage is highest at the steel cap and steel foot of suspension porcelain insulators, making them the weakest points most susceptible to breakdown. The high electric field strength makes these parts prone to partial discharge, especially under polluted or humid conditions, where surface discharge is more pronounced and can lead to complete breakdown and failure of the insulator in severe cases. Utility Model Content

[0004] The purpose of this invention is to provide a composite insulator that improves breakdown voltage, thereby solving at least one aspect of the problems and defects mentioned in the background art.

[0005] A composite insulator with improved breakdown voltage is provided, comprising a steel foot, a ceramic component disposed on the steel foot, a steel cap disposed on the ceramic component, and an anti-breakdown mechanism disposed on the upper part of the ceramic component.

[0006] Furthermore, the anti-breakdown mechanism includes several fastening threaded parts, which are arranged circumferentially above the ceramic part. The fastening threaded parts are evenly distributed along the circumference of the ceramic part. Its core function is to adjust the electric field distribution through conductive metal parts, weaken the electric field strength at the steel cap and steel foot, thereby improving the overall breakdown voltage of the insulator.

[0007] Furthermore, threaded holes are provided around the top of the ceramic component, and several fastening threaded components are detachably connected in the threaded holes. Since the fastening threaded components are evenly distributed around the top of the ceramic component, the electric field distortion effect they generate interacts with each other, making the electric field of the entire insulator more uniform, reducing the risk of partial discharge caused by abrupt changes in the electric field gradient, effectively adjusting the electric field distribution, reducing the electric field strength at the steel cap and steel foot, and improving the overall withstand voltage capability of the insulator.

[0008] Furthermore, the fastening threaded component is made of stainless steel. Since the fastening threaded component is evenly distributed around the top of the ceramic component, the electric field distortion effect generated by it interacts with each other, making the electric field of the entire insulator more uniform, reducing the risk of partial discharge caused by abrupt changes in the electric field gradient, effectively adjusting the electric field distribution, reducing the electric field strength at the steel cap and steel foot, and improving the overall withstand voltage capability of the insulator.

[0009] Furthermore, an asphalt layer is provided between the steel foot and the ceramic component. Asphalt is a material with high resistivity and low dielectric constant. It forms a transition layer between the steel foot and the ceramic component, making the electric field gradient smoother and reducing local electric field concentration, thereby reducing the risk of discharge and breakdown. Due to its high resistance characteristics, the asphalt layer can effectively prevent local current flow, reduce partial discharge phenomenon, and improve the reliability of the insulator.

[0010] Furthermore, a cement layer is provided between the steel cap and the porcelain component. The cement layer serves as a filler material to firmly bond the steel cap and the porcelain component, ensuring that they will not loosen due to long-term operation and improving the mechanical strength of the insulator. Suspension insulators need to withstand mechanical stresses such as wind force, vibration, and ice and snow loads in transmission lines.

[0011] Furthermore, the steel cap is provided with mounting holes for installing fasteners. After being connected by fasteners, the insulator can be ensured to remain stable during long-term operation, avoiding power failures caused by loosening and improving the safety and reliability of the transmission line.

[0012] Furthermore, a cylindrical pin is provided inside the mounting hole. The cylindrical pin, through a high-strength fastening method, can evenly distribute the load, reduce stress concentration inside the mounting hole, and thus extend the service life of the steel cap.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] Composite suspension insulators consist of steel feet, porcelain components, and steel caps. The porcelain components are mounted on the steel feet, and the steel caps are installed on top of the porcelain components. To address the issue of uneven electric field distribution, an anti-breakdown mechanism is installed on the upper circumference of the porcelain components. This mechanism has good conductivity and creates a local electric field enhancement effect around it, increasing the electric field strength in that area. According to the principle of electric field conservation, when the electric field strength at the top of the porcelain components increases, the electric field strength at the steel caps and steel feet will correspondingly decrease, thereby reducing local electric field distortion, lowering the voltage gradient at these critical locations, and reducing the local field strength at the steel caps and steel feet. This improves the overall withstand voltage level of the insulator, reduces faults caused by partial discharge or electrical breakdown, and prevents overall insulator breakdown failure. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 A schematic diagram of the overall structure of a composite insulator for improving breakdown voltage;

[0017] Figure 2 A top view of the ceramic component provided by this utility model;

[0018] Figure 3 This is a partial structural diagram of the steel cap provided by this utility model.

[0019] In the diagram: 1. Ceramic component; 11. Threaded hole; 2. Steel cap; 21. Mounting hole; 3. Steel foot; 4. Anti-penetration mechanism; 41. Fastening threaded component; 5. Asphalt layer; 6. Cement layer; 7. Cylindrical pin. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0021] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0022] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0023] Please see Figure 1-3 As shown in the embodiment of this utility model, a composite insulator for improving breakdown voltage includes a steel foot 3, a ceramic part 1 is provided on the steel foot 3, a steel cap 2 is provided on the ceramic part 1, and an anti-breakdown mechanism 4 is provided on the upper part of the ceramic part 1.

[0024] This composite suspension insulator includes a steel foot 3, a porcelain component 1, and a steel cap 2. The porcelain component 1 is mounted on the steel foot 3, and the steel cap 2 is mounted on the upper part of the porcelain component 1. To address the problem of uneven electric field distribution, an anti-breakdown mechanism 4 is installed on the upper circumference of the porcelain component 1. The anti-breakdown mechanism 4 has good conductivity and will create a local electric field enhancement effect around it, increasing the electric field strength in that area. According to the principle of electric field conservation, when the electric field strength on the upper part of the porcelain component 1 increases, the electric field strength at the steel cap 2 and the steel foot 3 will decrease accordingly, thereby reducing local electric field distortion, lowering the voltage gradient at these critical parts, reducing the local field strength at the steel cap 2 and the steel foot 3, improving the overall withstand voltage level of the insulator, reducing faults caused by partial discharge or electric breakdown, and preventing overall insulator breakdown failure.

[0025] In one embodiment, see Figure 1 , Figure 2 and Figure 3 As shown, the anti-breakdown mechanism 4 includes several fastening threaded parts 41, which are arranged circumferentially above the ceramic part 1. The anti-breakdown mechanism 4 is composed of several fastening threaded parts 41, which are evenly distributed along the circumference of the ceramic part 1. Its core function is to adjust the electric field distribution through conductive metal parts, weakening the electric field strength at the steel cap 2 and steel foot 3, thereby increasing the overall breakdown voltage of the insulator. As an electric field adjustment element, the fastening threaded parts 41 can attract some electric field lines, making the electric field energy evenly distributed above the ceramic part 1, reducing the electric field strength at the steel cap 2 and steel foot 3. The electric field concentration effect at point 3, with the uniformly distributed fastening threaded parts 41 forming an equipotential region, redistributes the electric field on the upper part of the ceramic part 1, so that it is no longer concentrated only at the steel cap 2 and steel foot 3, thereby achieving electric field homogenization, reducing partial discharge of the insulator, improving the overall withstand voltage strength, and making it have better operational reliability under high voltage environment. The anti-breakdown mechanism 4 optimizes the electric field, reduces the electric field strength at the steel cap 2 and steel foot 3, thereby improving the withstand voltage level of the insulator, reducing the risk of partial discharge and electric breakdown, and significantly improving the safety and service life of the insulator.

[0026] In one embodiment, see Figure 1 and Figure 2 As shown, threaded holes 11 are provided around the top of the ceramic component 1. Several fastening threaded parts 41 are detachably connected to the threaded holes 11. By providing threaded holes 11 around the top of the ceramic component 1 and installing detachable fastening threaded parts 41 in them, the electric field distortion effect generated by the fastening threaded parts 41, which are evenly distributed around the top of the ceramic component 1, interacts with each other, making the electric field of the entire insulator more uniform, reducing the risk of partial discharge caused by abrupt changes in the electric field gradient, effectively adjusting the electric field distribution, reducing the electric field strength at the steel cap 2 and the steel foot 3, and improving the overall withstand voltage capability of the insulator.

[0027] In one embodiment, see Figure 1 , Figure 2 and Figure 3 As shown, the fastening threaded part 41 is made of stainless steel. Its main function is to adjust the electric field distribution through the conductivity of the metal, thereby optimizing the overall withstand voltage performance of the insulator. Since stainless steel has good conductivity, the fastening threaded part 41 will become an equipotential point in the electric field, causing the surrounding electric field lines to redistribute. In addition, suspension insulators are usually used in outdoor high-voltage lines and are exposed to wind, rain, pollution and other environments for a long time. Stainless steel has good corrosion resistance and can effectively prevent structural failure or electrical performance degradation caused by rust. It also has good corrosion resistance, mechanical strength and maintainability, thereby improving the operational stability and service life of suspension insulators.

[0028] In one embodiment, see Figure 2 and Figure 3 As shown, an asphalt layer 5 is provided between the steel foot 3 and the ceramic part 1. The ceramic part 1 is an insulator, while the steel foot 3 is a conductor. The difference in dielectric constant between the two is large, and direct contact can easily lead to a sudden change in the electric field, causing the electric field to concentrate at the interface and become a weak point for breakdown. Asphalt is a material with high resistivity and low dielectric constant. It forms a transition layer between the steel foot 3 and the ceramic part 1, making the electric field gradient smoother and reducing local electric field concentration, thereby reducing the risk of discharge and breakdown. Due to its high resistance characteristics, the asphalt layer 5 can effectively prevent local current flow, reduce partial discharge, and improve the reliability of the insulator.

[0029] In one embodiment, see Figure 1 As shown, a cement layer 6 is provided between the steel cap 2 and the porcelain part 1. The cement layer 6 serves as a filler material to firmly bond the steel cap 2 and the porcelain part 1, ensuring that they will not loosen due to long-term operation and improving the mechanical strength of the insulator. Suspension insulators in transmission lines need to withstand mechanical stresses such as wind force, vibration, and snow loads. The cement layer 6 has high hardness and strength, which can effectively resist external impacts and mechanical loads, preventing damage to the insulator. After curing, the cement material has good weather resistance and stability, can maintain its strength for a long time, and is not easy to age or fail, making it suitable for long-term outdoor high-voltage transmission environments.

[0030] In one embodiment, see Figure 1 , Figure 2 and Figure 3 As shown, the steel cap 2 is provided with mounting holes 21, which are used to install fasteners. After being connected by fasteners, the insulator can be ensured to remain stable during long-term operation, avoiding power failures caused by loosening, and improving the safety and reliability of the transmission line.

[0031] In one embodiment, see Figure 1 , Figure 2 and Figure 3 As shown, a cylindrical pin 7 is provided in the mounting hole 21. Its main function is to enhance the mechanical connection strength, improve the impact resistance, and ensure long-term stability, thereby ensuring the safe and reliable operation of the insulator. After the cylindrical pin 7 is inserted into the mounting hole 21, it can prevent the fasteners from loosening, ensure the tight connection between the steel cap 2 and other components, and improve the mechanical strength.

[0032] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A composite insulator for improving breakdown voltage, comprising steel legs (3), characterized in that, A ceramic part (1) is provided on the steel foot (3), a steel cap (2) is provided on the ceramic part (1), and an anti-penetration mechanism (4) is provided on the upper part of the ceramic part (1).

2. The composite insulator for improving breakdown voltage according to claim 1, characterized in that, The anti-penetration mechanism (4) includes several fastening threaded parts (41), which are arranged on the ceramic part (1) in a circumferential direction.

3. A composite insulator for improving breakdown voltage according to claim 2, characterized in that, The ceramic component (1) has threaded holes (11) around its upper perimeter, and several fastening threaded components (41) are detachably connected to the threaded holes (11).

4. A composite insulator for improving breakdown voltage according to claim 2, characterized in that, The fastening threaded part (41) is a fastening threaded part made of stainless steel.

5. A composite insulator for improving breakdown voltage according to claim 1, characterized in that, An asphalt layer (5) is provided between the steel foot (3) and the ceramic part (1).

6. A composite insulator for improving breakdown voltage according to claim 4, characterized in that, A cement layer (6) is provided between the steel cap (2) and the ceramic part (1).

7. A composite insulator for improving breakdown voltage according to claim 4, characterized in that, The steel cap (2) is provided with mounting holes (21).

8. A composite insulator for improving breakdown voltage according to claim 7, characterized in that, A cylindrical pin (7) is provided inside the mounting hole (21).

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