Corona suppression device for wide-area low-pressure environment

Abstract

The invention discloses a corona suppression device for a wide-area low-pressure environment, and relates to the technical field of high-voltage power transmission and distribution, the corona suppression device for the wide-area low-pressure environment comprises a suppression body which is of a multi-section composite curved surface structure and is arranged on the outer side of a transformer wire adapter connector, and the suppression body comprises a central section and a transition section, the transition sections are arranged in pairs, the transition sections in pairs are symmetrically arranged at the two ends of the central section in the extension direction of the wire, and the surfaces of the central section and the transition sections are continuous smooth curved surfaces; according to the corona suppression device for the wide-area low-air-pressure environment, local field intensity concentration is eliminated through the suppression body of the multi-section composite curved surface structure by means of gradual change of the structural form and gradual change of guide electric field distribution, the maximum field intensity of the whole connector area is lower than the corona inception field intensity of air, corona triggering is suppressed from the source, and the corona suppression device is particularly suitable for the low-air-pressure environment.

Description

Technical Field

[0001] This invention belongs to the field of high voltage power transmission and distribution technology, specifically relating to a wide-area low-pressure environment corona suppression device. Background Technology

[0002] Conductor transition joints (such as crimped couplings, pipe clamps, and tension clamps) at the transformer bushing terminals are unavoidable structures in power lines. They disrupt the smooth cylindrical shape of the conductors, causing severe distortion of the electric field. Sharp corners, burrs, and steps on their surfaces, as well as at the ends of fasteners, create extremely high local electric field strengths, becoming the most vulnerable points for corona discharge. Corona discharge can damage electrical equipment and, in severe cases, even cause fires or explosions. This problem is particularly pronounced in low-pressure environments where the atmospheric corona field strength is reduced. Summary of the Invention

[0003] The purpose of this invention is to provide a simple and reasonably designed corona suppression device for wide-area low-pressure environments in order to solve the above-mentioned problems.

[0004] The present invention achieves the above objectives through the following technical solutions: A wide-area low-pressure environment corona suppression device, comprising: The suppression body is a multi-segment composite curved surface structure, which is set on the outside of the transformer conductor adapter. The suppression body includes a central segment and a transition segment. The transition segments are arranged in pairs along the extension direction of the conductor. The pairs of transition segments are symmetrically arranged at both ends of the central segment. The surfaces of the central segment and the transition segment are both continuous smooth curved surfaces.

[0005] As a further optimization of the present invention, the diameter of the fitting body at the transformer conductor transfer joint of the central section matches that of the fitting body, and the coverage area of ​​the fitting by the central section is not less than 50%.

[0006] As a further optimization of the present invention, the suppression body adaptably and smoothly transitions from the center to both ends according to the direction of the conductor and the change in the diameter of the main body of the fitting.

[0007] As a further optimization of the present invention, along the extension direction of the conductor, smooth rings are provided at the connection points between the two ends of the central segment and the corresponding gradient segments.

[0008] As a further optimization of the present invention, the gradient segment includes a circular ring portion and a circular head portion, with the circular head portions respectively disposed at both ends of the circular ring portion.

[0009] As a further optimization of the present invention, the inner wall of the suppression body and the surface of the fitting are respectively coated with a functionally graded material layer, and the relative permittivity of the functionally graded material layer gradually decreases from the inside to the outside.

[0010] As a further optimization of the present invention, a retainer is provided on the inner side of the central section, which is used to fix the suppression body on the wire at the hardware position.

[0011] As a further optimization of the present invention, the fixture includes an upper clamp, a lower clamp, a locking member, a connecting member, and an adapter. The adapter is fixedly installed on the inner wall of the central section. The upper clamp has a hanging ear fixedly provided on the outer side of the arc segment. The hanging ear is assembled onto the adapter via the connecting member. The upper clamp has an upper flange fixedly provided at both ends of the arc segment. The lower clamp has a lower flange fixedly provided at both ends of the arc segment. The upper flange and the lower flange are correspondingly provided and are fixedly connected by the locking member. The wire is located between the arc segments of the upper clamp and the lower clamp.

[0012] As a further optimization of the present invention, the adapter is provided with an adjustment groove, and the connector is slidably connected to the adjustment groove, wherein the extension direction of the adjustment groove is consistent with the extension direction of the wire.

[0013] As a further optimization of the present invention, the ear loops are arranged in pairs, with the ear loops corresponding to the adapters. Along the extension direction of the wire, the pairs of ear loops are symmetrically arranged, wherein the paired ear loops are inverted V-shaped, and the ear loops are located on the outside of the corresponding adapters.

[0014] The present invention has at least the following beneficial effects: The wide-area low-pressure environment corona suppression device provided by the present invention includes a suppression body, which is a multi-segment composite curved surface structure, and is set on the outside of the transformer conductor transition joint. The suppression body includes a central segment and a gradient segment. The gradient segments are arranged in pairs along the extension direction of the conductor. The pairs of gradient segments are symmetrically arranged at both ends of the central segment. The surfaces of the central segment and the gradient segment are both continuous smooth curved surfaces. By means of the gradual change in structural shape, the gradual change in electric field distribution is guided, eliminating the local field strength concentration, so that the maximum field strength of the entire joint area is lower than the corona initiation field strength of air, thereby suppressing corona triggering from the root, and is especially suitable for low-pressure environments. Furthermore, the transition section includes a circular annular portion and a rounded head, with the rounded heads located at both ends of the circular annular portion. This further increases the radius of curvature at the end, completely eliminating sharp edges and structurally preventing the risk of electric field concentration. Furthermore, a functionally graded material layer is coated on the inner wall of the suppressor body and the surface of the fittings. From the inside out, the relative permittivity of the functionally graded material layer gradually decreases, guiding the electric field intensity to decay smoothly along the material thickness direction, rather than suddenly concentrating on the metal surface. This controls the local electric field intensity below the air corona field strength, fundamentally suppressing corona generation. In addition, the main body is installed on the wire at the hardware position by a retainer. The retainer includes an upper clamp, a lower clamp, a locking element, a connecting element, and an adapter. The two-part structure of the upper and lower clamps enables convenient installation and removal of the device. The installation between the paired inverted V-shaped hanging ears and the corresponding adapter ensures that the overall device is securely installed and prevents it from loosening. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention viewed from below; Figure 2 This is the invention Figure 1 A top-down 3D structural diagram; Figure 3 This is an exploded view of the corona suppression device of the present invention.

[0016] In the diagram: 1. Central section; 2. Gradient section; 21. Circular part; 22. Round head; 3. Adapter seat; 31. Adjustment groove; 4. Connector; 5. Upper clamp; 51. Hanging ear; 52. Upper flange; 6. Locking part; 7. Lower clamp; 71. Lower flange. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0018] like Figure 1 , Figure 2 As shown, the present invention provides a wide-area low-pressure environment corona suppression device, comprising: The suppression body, a multi-segment composite curved surface structure, is located on the outside of the transformer conductor adapter joint, such as... Figure 1 As shown in the figure, the dashed lines represent the distribution trajectory of the transformer's conductors, and point A simply indicates the location of the transformer conductor transition joint. The suppression body includes a central section 1 and a transition section 2, as shown in the figure. Figure 2 As shown, the gradient segments 2 are arranged in pairs. Along the extension direction of the conductor, the pairs of gradient segments 2 are symmetrically arranged at both ends of the central segment 1. The surfaces of the central segment 1 and the gradient segments 2 are both continuous smooth curved surfaces.

[0019] It should be noted that the electric field intensity E on the surface of a conductor is inversely proportional to its radius of curvature r. That is, the smaller the radius of curvature, the higher the local field strength. For example, structures such as sharp corners, burrs, and steps have extremely small radii of curvature, which easily form "electric field concentration". When the local field strength exceeds the air breakdown field strength, it will trigger electron avalanche and ionization discharge, which manifests as corona. Therefore, the suppression body with the above-mentioned multi-segment composite curved surface structure has a more optimized structure and can be specifically used for situations with complex connection structures at wire transition joints. It achieves an electric field equalization effect far exceeding that of traditional equalizing rings or pre-twisted wires. Moreover, the suppression body has a continuously changing radius of curvature. By using the gradual change of structural shape, it guides the gradual change of electric field distribution, eliminates local field strength concentration, and makes the maximum field strength of the entire joint area lower than the corona initiation field strength of air (especially in low-pressure environments). This suppresses corona triggering from the root, and is especially suitable for low-pressure environments, so that it can still maintain sufficient anti-corona margin in low-pressure environments.

[0020] The material of the suppressor body is a rigid metal, such as 304 stainless steel, 316 stainless steel, aluminum alloy (6061-T6 / 5052-H32), etc. There is no limitation here. This makes the suppressor body more resistant to wind and rain erosion and ultraviolet aging than flexible parts such as pre-twisted wires, and has a longer life cycle.

[0021] For example, the diameter of the central section 1 matches the main body of the fitting at the transformer conductor transition joint, and the coverage area of ​​the central section over the fitting is not less than 50%. It should be noted that the conductor transition joint (such as a crimped splice, tension clamp, or conduit clamp) is the part where electric field distortion is most severe. Therefore, the coverage area of ​​the device mainly targets the connection area between the joint and the conductor / fitting, as well as the electric field-sensitive part of the joint body, which is the distortion area most prone to corona. By meeting the above coverage requirements, the distortion area is effectively covered, providing a structural basis for a smooth transition of the electric field and suppressing corona generation at its source. The requirement that the central section cover not less than 50% of the fitting refers to the length direction.

[0022] In this process, the suppression body adapts to the changing direction of the conductor and the diameter of the fitting body by gradually and smoothly transitioning from the center to both ends. For example, if the conductor is distributed in a curved manner, the suppression body is also distributed in a curved manner. Or, if the diameter of the fitting body increases, the radial dimension of the suppression body at the corresponding position increases. This is not limited here, so that the final suppression body forms a "tile-shaped" or "streamlined" suppression area.

[0023] For example, along the extension direction of the conductor, smooth rings are provided at the connection points between the two ends of the central segment 1 and the corresponding gradient segment 2, so that the overall surface of the suppression body is smooth, ensuring that the electric field of the component that suppresses corona will not be concentrated again due to sharp edges.

[0024] Continue reading Figure 2 The transition section 2 includes a circular ring portion 21 and a rounded head portion 22, with the rounded head portion 22 respectively located at both ends of the circular ring portion 21. Further increasing the radius of curvature at the end completely eliminates sharp edges, structurally preventing the risk of electric field concentration.

[0025] For example, the inner wall of the suppression body and the surface of the fitting are respectively coated with a functionally graded material layer. From the inside out, the relative permittivity of the functionally graded material layer gradually decreases, that is, from a high permittivity close to that of metal to a low permittivity close to that of air. This stepped-gradient material is equivalent to building a "dielectric transition bridge" between the metal (suppression body / fitting) and the air, avoiding the abrupt change in electric field caused by the sudden change in permittivity. Moreover, the gradually decreasing permittivity from the inside out guides the electric field strength to decay smoothly along the material thickness direction, rather than suddenly concentrating on the metal surface. This controls the local electric field strength below the air corona induction field strength, fundamentally suppressing corona generation and avoiding the risk of field strength concentration at the traditional "metal-air" and "metal-ordinary insulating material" interfaces. It is especially suitable for low-pressure (high-altitude) environments, where the air corona induction field strength is already lower. This material design can further improve the electric field homogenization effect, ensuring sufficient anti-corona margin even in harsh environments.

[0026] It should be noted that a retainer is provided on the inner side of the central section 1. The retainer is used to fix the suppression body to the wire at the hardware location. This secures the suppression body to the wire, preventing it from loosening even under prolonged harsh weather conditions.

[0027] Continue reading Figure 1 and Figure 3 The fixture includes an upper clamp 5, a lower clamp 7, a locking member 6, a connecting member 4, and an adapter 3. The adapter 3 is fixedly installed on the inner wall of the central section 1. The upper clamp 5 has a hanging ear 51 fixedly provided on the outer side of the arc segment. The hanging ear 51 is assembled on the adapter 3 through the connecting member 4. The upper flange 52 is fixedly provided at both ends of the arc segment of the upper clamp 5, and the lower flange 71 is fixedly provided at both ends of the arc segment of the lower clamp 7. The upper flange 52 and the lower flange 71 are correspondingly provided and are fixedly connected by the locking member 6. The wire is located between the arc segment of the upper clamp 5 and the arc segment of the lower clamp 7. By fixing the upper clamp 5 to the suppression body through the installation between the hanging ear 51 and the adapter 3, the arc of the upper clamp 5 is first fixed to one side of the conductor, then the lower clamp 7 is placed on the other side of the conductor, and the lower clamp 7 and the upper clamp 5 are fixed together by means of the locking member 6, so as to achieve the fixed installation of the corona suppression device.

[0028] The two-part structure allows the fastener to be quickly snapped onto the connector on-site, thus securing the machinery.

[0029] It should be noted that the two ends of the adapter 3 are smoothly connected to the surface of the corresponding gradient section 2.

[0030] Among them, the locking part 6 is a fastening bolt, and the connecting part 4 is an anti-loosening elastic connecting part. The anti-loosening elastic connecting part can be composed of high-strength stainless steel bolts, anti-loosening nuts (nylon lock nuts / all-metal lock nuts), disc springs (or wave springs), and flat washers (smooth arc edges). While ensuring convenient installation and removal between the adapter 3 and the hanging ear 51, it can resist vibration and ensure stable installation.

[0031] Continue reading Figure 1 and Figure 3 The adapter 3 has an adjustment groove 31, and the connector 4 is slidably connected to the adjustment groove 31. The extension direction of the adjustment groove 31 is consistent with the extension direction of the conductor. The position of the upper clamp 5 can be flexibly adjusted to adapt to the installation area on the conductor except for the joint position. The upper clamps 5 are arranged in pairs, and the upper clamp 5 and the lower clamp 7 are arranged correspondingly to realize the multi-point fixed installation of the corona suppression device on the conductor.

[0032] It should be noted that, as Figure 3 As shown, the ear loops 51 are arranged in pairs, and the ear loops 51 are correspondingly arranged with the adapter 3. Along the extension direction of the wire, the pairs of ear loops 51 are symmetrically arranged. The pairs of ear loops 51 are inverted V-shaped, and the ear loops 51 are located on the outside of the corresponding adapter 3.

[0033] The inverted V-shaped symmetrical structure can evenly distribute the wire clamping force (such as radial pressure and axial tension) borne by the upper clamp 5 to the two lugs 51, avoiding local stress concentration caused by single-point force and reducing the risk of deformation of the lugs 51 or the adapter 3.

[0034] It should be noted that, in use, this wide-area low-pressure environment corona suppression device is fixedly connected to the adapter 3 via the connector 4. To avoid obstructing the adapter position of the wire, the distance between the two upper clamps 5 can be controlled by adjusting the guide of the adjusting groove 31. The suppression body is then placed on one side of the wire, and the lower clamp 7 is aligned with one side of the upper clamp 5. The upper flange 52 and lower flange 71 are then fixed together using the locking member 6 to complete the installation of the corona suppression device. The suppression... The main body is a multi-segment composite curved surface structure, including a central segment 1 and a gradient segment 2. The gradient segments 2 are arranged in pairs along the extension direction of the conductor. The pairs of gradient segments 2 are symmetrically arranged at both ends of the central segment 1. The surfaces of the central segment 1 and the gradient segments 2 are both continuous smooth curved surfaces. By means of the gradual change in structural shape, the gradual change in electric field distribution is guided, eliminating the concentration of local field strength, so that the maximum field strength of the entire joint area is lower than the corona initiation field strength of air (especially in low-pressure environments), thereby suppressing corona triggering from the root, which is especially suitable for low-pressure environments.

[0035] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A wide-area low-pressure environment corona suppression device, characterized in that, include: The suppression body is a multi-segment composite curved surface structure, which is set on the outside of the transformer conductor adapter. The suppression body includes a central segment (1) and a gradient segment (2). The gradient segments (2) are set in pairs. Along the extension direction of the conductor, the pairs of gradient segments (2) are symmetrically set at both ends of the central segment (1). The surfaces of the central segment (1) and the gradient segment (2) are both continuous smooth curved surfaces.

2. The wide-area low-pressure environment corona suppression device according to claim 1, characterized in that, The central section (1) matches the diameter of the fitting body at the transformer conductor transfer joint, and the central section covers a portion of the fitting with a radius of not less than 50%.

3. The wide-area low-pressure environment corona suppression device according to claim 1, characterized in that, Based on the direction of the conductor and the change in the diameter of the main body of the fitting, the suppression body adaptively and smoothly transitions from the center to both ends.

4. The wide-area low-pressure environment corona suppression device according to claim 1, characterized in that, Along the extension direction of the conductor, smooth rings are provided at the connection points between the two ends of the central segment (1) and the corresponding gradient segment (2).

5. A wide-area low-pressure environment corona suppression device according to claim 4, characterized in that, The gradient section (2) includes a circular part (21) and a round head (22), with the round head (22) respectively located at both ends of the circular part (21).

6. The wide-area low-pressure environment corona suppression device according to claim 1, characterized in that, The inner wall of the suppression body and the surface of the fitting are respectively coated with a functionally graded material layer, and the relative permittivity of the functionally graded material layer gradually decreases from the inside to the outside.

7. The wide-area low-pressure environment corona suppression device according to claim 1, characterized in that, A retainer is provided on the inner side of the central section (1), which is used to fix the suppressor body on the wire at the hardware position.

8. A wide-area low-pressure environment corona suppression device according to claim 7, characterized in that, The fixture includes an upper clamp (5), a lower clamp (7), a locking member (6), a connecting member (4), and an adapter (3). The adapter (3) is fixedly installed on the inner wall of the central section (1). The upper clamp (5) has a hanging ear (51) fixedly installed on the outside of the arc segment. The hanging ear (51) is assembled on the adapter (3) through the connecting member (4). The upper clamp (5) has an upper flange (52) fixedly installed at both ends of the arc segment. The lower clamp (7) has a lower flange (71) fixedly installed at both ends of the arc segment. The upper flange (52) and the lower flange (71) are correspondingly arranged and are fixedly connected by the locking member (6). The wire is located between the arc segment of the upper clamp (5) and the arc segment of the lower clamp (7).

9. A wide-area low-pressure environment corona suppression device according to claim 8, characterized in that, The adapter (3) is provided with an adjustment groove (31), and the connector (4) is slidably connected to the adjustment groove (31), wherein the extension direction of the adjustment groove (31) is consistent with the extension direction of the wire.

10. A wide-area low-pressure environment corona suppression device according to claim 9, characterized in that, The ear loops (51) are arranged in pairs, and the ear loops (51) are correspondingly arranged with the adapter (3). Along the extension direction of the wire, the pairs of ear loops (51) are symmetrically arranged. The pairs of ear loops (51) are inverted V-shaped, and the ear loops (51) are located on the outside of the corresponding adapter (3).

Images