An electrical fitting for increasing corona voltage by reducing the possibility of condensation

Abstract

The present invention provides an electric fitting that increases the corona voltage by reducing the possibility of condensation. The outer surface of the electric fitting is provided with a surface coating, and the surface coating is provided with hydrophilic fiber particles. The surface coating and the hydrophilic fiber particles are used to accelerate the speed at which supersaturated water vapor diffuses into a water film when condensing on the surface of the electric fitting, so as to prevent the electric fitting from forming large droplets in a condensation environment under high humidity and causing obvious corona. The present invention accelerates the diffusion of supersaturated water vapor into a water film as soon as possible when condensing on the surface of the fitting by the surface coating and the hydrophilic fiber particles, so that the supersaturated water vapor in the air condenses to form a water film on the surface of the electric fitting, preventing the electric fitting from condensing under high humidity from forming large droplets, thereby reducing the possibility of the fitting from condensing under high humidity conditions from forming large droplets, and avoiding the occurrence of obvious corona caused by large droplets.

Description

Technical Field

[0001] The invention relates to the technical field of electric power fittings, and in particular to an electric power fitting capable of increasing corona voltage by reducing the possibility of condensation. Background Art

[0002] The climate in southern my country is humid. In Hubei, Jiangsu and other places, high humidity weather such as light rain and fog occurs frequently, and the average relative humidity often exceeds 70%. Especially during the rainy season from May to July every year, the climate conditions of high temperature and high humidity (hot fog, water droplets) coexist, and in the foggy (cold fog) weather with high relative humidity in winter and early spring, the water molecule content in the surrounding air increases, which may reduce the breakdown strength of the air, resulting in visible corona in power fittings. In particular, the corona noise in the substation is significantly greater than that in sunny weather, and visible corona can also be observed on some power fittings. Especially near the condensing tower of the DC station, the air humidity is often kept above 90%, and condensation is very likely to occur in the nearby power fittings, resulting in a high possibility of corona.

[0003] Through the corona inception voltage test of typical electrodes under different relative humidity conditions, the test results all show the following rules: when the relative humidity is in the range of 30%~70%, the corona inception voltage gradually decreases with the increase of relative humidity; when the relative humidity is higher than 70%, the corona inception voltage decreases less with the increase of relative humidity. During the test, when the relative humidity reaches a certain level and the temperature drops to a certain threshold, condensation will form on the surface of the equalizing ball. During the test, it was found that under the same humidity conditions, the two states of condensation and no condensation have a very large impact on the corona discharge of the electrode. Each stage of condensation will cause electric field distortion, and the electric field distortion is most serious at the moment of condensation dripping. The test results show that condensation and no condensation have an important influence on the corona inception voltage of the ball electrode surface. When condensation occurs, the corona inception voltage decreases by 29.6%-48.8% compared with that without condensation, indicating that the influence of condensation on the corona of power fittings is very important.

[0004] Therefore, in order to increase the visible corona voltage of power fittings and reduce the corona risk of power fittings in high humidity environments, reducing condensation droplets can play a very important role. Summary of the invention

[0005] In view of this, the present invention proposes an electrical fitting that increases the corona voltage by reducing the possibility of condensation, aiming to increase the visible corona voltage of the electrical fitting, reduce the corona risk of the electrical fitting in a high humidity environment, and reduce condensation droplets.

[0006] The present invention proposes an electric hardware that increases the corona voltage by reducing the possibility of condensation. The outer surface of the electric hardware is provided with a surface coating, and hydrophilic fiber particles are provided in the surface coating. The surface coating and the hydrophilic fiber particles are used to accelerate the speed at which supersaturated water vapor diffuses into a water film when condensing on the surface of the electric hardware, so as to prevent the electric hardware from forming large droplets in a condensation environment under high humidity and causing obvious corona.

[0007] Furthermore, in the above-mentioned electrical hardware that increases the corona voltage by reducing the possibility of condensation, the surface coating is a single-layer structure, which is a hydrophilic coating.

[0008] Furthermore, in the above-mentioned electrical hardware for increasing corona voltage by reducing the possibility of condensation, the hydrophilic coating is an epoxy resin coating containing hydrophilic groups.

[0009] Furthermore, in the above-mentioned electrical fittings for increasing corona voltage by reducing the possibility of condensation, the hydrophilic group is one or both of polyethylene glycol and polyethylene glycol amine.

[0010] Furthermore, in the above-mentioned electrical hardware for increasing corona voltage by reducing the possibility of condensation, the hydrophilic coating is a hydrophilic insulator coating or a hydrophilic semiconductor coating.

[0011] Furthermore, in the above-mentioned electrical hardware that increases corona voltage by reducing the possibility of condensation, the surface coating is a double-layer structure, which includes a hydrophilic coating and an insulating coating.

[0012] Furthermore, in the above-mentioned electrical fittings for increasing corona voltage by reducing the possibility of condensation, the hydrophilic fiber particles are one or both of glass fiber particles and natural fiber particles.

[0013] Furthermore, in the above-mentioned electrical hardware that increases corona voltage by reducing the possibility of condensation, the surface coating is 1 mm.

[0014] Furthermore, in the above-mentioned electrical fitting that increases corona voltage by reducing the possibility of condensation, the distribution density of hydrophilic fiber particles in the surface coating at the corners of the electrical fitting is greater than the distribution density of hydrophilic fiber particles in the surface coating at the connecting surface of the electrical fitting; wherein the connecting surface is a plane or a curved surface.

[0015] Furthermore, the electrical fittings for increasing the corona voltage by reducing the possibility of condensation are anti-corona fittings.

[0016] The electric fittings provided by the present invention can improve the corona voltage by reducing the possibility of condensation. The surface coating is coated on the surface of the electric fittings, and hydrophilic fiber particles are arranged in the surface coating, so that the supersaturated water vapor is accelerated to diffuse into a water film as soon as possible when condensing on the surface of the fittings under the action of the surface coating and the hydrophilic fiber particles, so that the supersaturated water vapor in the air condenses on the surface of the electric fittings to form a water film, and the condensation of the electric fittings under high humidity is prevented from forming large droplets, so as to reduce the possibility of the condensation of the fittings under high humidity conditions to form large droplets, thereby avoiding the phenomenon of obvious corona caused by large droplets, thereby reducing the risk of corona of the electric fittings under high humidity conditions; at the same time, the hydrophilic fiber particles also form a water-absorbing structure, which ensures that the height of the water droplets is reduced, that is, the thickness of the water film is reduced, so as to avoid the water film being too thick and causing the electric fittings to have a corona scene. In addition, the surface coating has a certain thickness, and has a certain wear resistance and impact resistance, which can prevent the electric fittings from being scratched and deformed during transportation and installation, thereby further improving the anti-corona capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0018] Figure 1 A schematic diagram of the structure of an electric power fitting for increasing the corona voltage by reducing the possibility of condensation provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the structure between the surface coating and the hydrophilic fiber particles provided by an embodiment of the present invention;

[0020] Figure 3 Another schematic diagram of the structure of the surface coating provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] See also Figure 1 to Figure 2, which shows the preferred structure of the power fittings provided by the embodiment of the present invention for increasing the corona voltage by reducing the possibility of condensation. As shown in the figure,

[0023] The outer surface of the electric fitting 1 is provided with a surface coating 2, which is used to accelerate the speed of supersaturated water vapor diffusing into a water film when condensing on the surface of the electric fitting 1, so as to prevent the electric fitting 1 from forming large droplets under a condensation environment with high humidity and causing obvious corona, that is, to reduce the possibility of condensation of the electric fitting 1 under high humidity conditions to form large water droplets, thereby increasing the visible corona voltage of the electric fitting 1 under special conditions. At the same time, the surface coating 2 has a certain thickness, a certain wear resistance and impact resistance, which can prevent the electric fitting 1 from being scratched and deformed during transportation and installation, thereby further improving the anti-corona capability.

[0024] The surface coating 2 is provided with hydrophilic fiber particles 3, that is, the surface coating 2 is mixed with hydrophilic fiber particles, that is, the coating of the surface coating 2 is mixed with hydrophilic fiber particles to further increase the diffusion speed of the water film, and at the same time form a water-absorbing structure to ensure that the height of the water droplets is reduced. Under the action of the surface coating 2 and the hydrophilic fiber particles 3, the supersaturated water vapor in the air condenses on the surface of the power fitting 1 to form a water film with a thickness not exceeding 1mm, reducing the possibility of condensation of the power fitting 1 to form large water droplets under high humidity conditions, thereby reducing the corona risk of the power fitting 1 under high humidity conditions. At the same time, the hydrophilic fiber particles 3 also form a water-absorbing structure to ensure that the height of the water droplets is reduced, that is, the thickness of the water film is reduced to no more than 1mm, so as to avoid the water film being too thick and causing the power fitting 1 to have a corona scene.

[0025] In one implementation of the present embodiment, the surface coating 2 is a single-layer structure, which can be a hydrophilic coating to achieve supersaturated water vapor to diffuse into a water film as soon as possible when condensing on the surface of the electric fitting 1, thereby reducing the possibility of condensation on the surface of the electric fitting 1 in a high humidity environment, thereby increasing the corona voltage of the electric fitting 1. Preferably, the hydrophilic coating can be a hydrophilic insulator coating or a hydrophilic semiconductor coating, which further increases the insulation strength of the surface of the electric fitting 1, thereby further reducing the corona risk on the surface of the electric fitting. Among them, the hydrophilic coating can be an epoxy resin coating containing a hydrophilic group, which can not only increase the corona voltage of the electric fitting 1, but also the epoxy resin has a certain mechanical strength, and as a coating substrate, it also has a certain thickness, has a certain wear resistance and impact resistance, and prevents scratches and deformation during transportation and installation, thereby further providing anti-corona ability. The epoxy resin can be an epoxy resin with insulating properties. Among them, the hydrophilic group can be polydiethanol, polydiethanolamine, or other hydrophilic groups.

[0026] In another implementation of this embodiment, Figure 3As shown, the surface coating 2 is a double-layer structure, which includes a hydrophilic coating 21 and an insulating coating 22; wherein the insulating coating 22 is arranged on the outer surface of the electric fitting 1, and the hydrophilic coating 21 is coated on the outer surface of the insulating coating 22. wherein, the insulating coating 22 can be an insulator or a semiconductor, which can be fixedly connected to the outer surface of the electric fitting 1 by welding or other means, and can also be arranged on the outer surface of the electric fitting 1 by spraying; the hydrophilic coating 21 can be an epoxy resin coating containing a hydrophilic group, which can be coated on the outer surface of the insulating coating 22, which can not only improve the corona voltage of the electric fitting 1, but also, the epoxy resin has a certain mechanical strength, and as a coating substrate, it also has a certain thickness, and has a certain wear resistance and impact resistance, which prevents scratches and deformation during transportation and installation, thereby further providing anti-corona capability. The epoxy resin can be an epoxy resin with insulating properties.

[0027] In the above embodiments, the hydrophilic fiber particles 3 can be evenly arranged in the surface coating 2, or can be distributed according to the specific structure of the electrical hardware. For example, the hydrophilic fiber particles 3 in the surface coating 2 can be distributed at a high density at locations where condensation is likely to form large water droplets. For example, the distribution density of the hydrophilic fiber particles 3 in the surface coating 2 at the corners is greater than the distribution density of the hydrophilic fiber particles 3 in the surface coating 2 at the connection surface; the connection surface can be a plane or a curved surface. Among them, the hydrophilic fiber particles 3 can be one or both of glass fiber particles and natural fiber particles, that is, at least one of glass fiber particles and natural fiber particles can be mixed in the surface coating 2, and the hydrophilic fiber particles 3 can be glass fiber particles or natural fiber particles, or can be a mixture formed by a combination of glass fiber particles and natural fiber particles.

[0028] In the above-mentioned embodiments, the thickness of the surface coating layer 2 is less than or equal to 1 mm.

[0029] In this embodiment, the power fitting 1 may be an anti-corona power fitting, such as a voltage-equalizing ring, a shielding ring, and the like.

[0030] In summary, the electric fittings provided in this embodiment can improve the corona voltage by reducing the possibility of condensation, by providing a surface coating 2 on the surface of the electric fitting 1, and providing hydrophilic fiber particles 3 in the surface coating 2, so that the supersaturated water vapor can be accelerated to diffuse into a water film as soon as possible when condensing on the surface of the fitting under the action of the surface coating 2 and the hydrophilic fiber particles 3, so that the supersaturated water vapor in the air can condense to form a water film on the surface of the electric fitting 1, and prevent the electric fitting 1 from condensing to form large droplets under high humidity, so as to reduce the possibility of large droplets of water condensed under high humidity conditions, and thus avoid the phenomenon of obvious corona caused by large droplets, thereby reducing the risk of corona of the electric fitting under high humidity conditions; at the same time, the hydrophilic fiber particles 3 also form a water-absorbing structure to ensure that the height of the water droplets is reduced, that is, the thickness of the water film is reduced, so as to avoid the water film being too thick and causing the electric fitting 1 to have a corona scene. In addition, the surface coating 2 has a certain thickness, and has a certain wear resistance and impact resistance, which can prevent the electric fitting 1 from being scratched and deformed during transportation and installation, thereby further improving the anti-corona capability.

[0031] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0032] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An electrical fitting that increases the corona voltage by reducing the possibility of condensation. It is characterized in that The outer surface of the electric power fitting is provided with a surface coating, and the surface coating is provided with hydrophilic fiber particles, and the surface coating and the hydrophilic fiber particles are used to accelerate the speed at which supersaturated water vapor diffuses into a water film when condensing on the surface of the electric power fitting, so as to prevent the electric power fitting from forming large droplets in a condensation environment under high humidity and causing obvious corona; The distribution density of the hydrophilic fiber particles in the surface coating at the corners of the power fitting is greater than the distribution density of the hydrophilic fiber particles in the surface coating at the connecting surface of the power fitting; wherein the connecting surface is a plane or a curved surface.

2. The electrical fitting for increasing corona voltage by reducing the possibility of condensation according to claim 1, It is characterized in that The surface coating is a single-layer structure, which is a hydrophilic coating.

3. The electrical fitting for increasing corona voltage by reducing the possibility of condensation according to claim 2, It is characterized in that The hydrophilic coating is an epoxy resin coating containing hydrophilic groups.

4. The electrical fitting for increasing corona voltage by reducing the possibility of condensation according to claim 3, It is characterized in that The hydrophilic group is one or both of polyethylene glycol and polyethylene glycol amine.

5. The electrical fitting for increasing corona voltage by reducing the possibility of condensation according to claim 2, It is characterized in that The hydrophilic coating is a hydrophilic insulator coating or a hydrophilic semiconductor coating.

6. The electrical fitting for increasing corona voltage by reducing the possibility of condensation according to claim 1, It is characterized in that The surface coating is a double-layer structure, which includes a hydrophilic coating and an insulating coating.

7. The electrical fitting for increasing the corona voltage by reducing the possibility of condensation according to any one of claims 1 to 6, It is characterized in that The hydrophilic fiber particles are one or both of glass fiber particles and natural fiber particles.

8. The electrical fitting for increasing corona voltage by reducing the possibility of condensation according to any one of claims 1 to 6, It is characterized in that The surface coating is 1 mm.

9. The electrical fitting for increasing corona voltage by reducing the possibility of condensation according to any one of claims 1 to 6, It is characterized in that The electric power fittings are anti-corona fittings.

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