Corona cleaning device and method for conductor surface

Abstract

This invention discloses a corona cleaning device and method for conductor surfaces. The device includes: a housing with a through hole along its axial direction for the conductor to pass through; a corona discharge unit disposed inside the housing and arranged circumferentially along the through hole, used to generate corona plasma surrounding the conductor under the action of the potential difference formed between the conductor and the corona discharge unit; a self-powered unit electrically connected to the corona discharge unit, used to extract energy from the conductor and provide a continuous DC voltage to the corona discharge unit to maintain corona discharge; and a walking mechanism connected to the housing to drive the device to move along the overhead conductor. This invention utilizes the conductor's own operating voltage to achieve automatic cleaning without power outages, avoiding the economic losses from power outages and the safety risks of high-altitude operations associated with traditional manual power outage cleaning methods.

Description

Technical Field

[0001] This invention relates to the field of electrical engineering technology, and in particular to a device and method for cleaning corona discharge from the surface of conductors. Background Technology

[0002] With the long-term operation of power systems, the surfaces of overhead transmission lines exposed to the outdoor environment gradually accumulate salt, dust, industrial pollutants, and other contaminants. This contamination exacerbates the distortion of the electric field strength on the conductor surface, inducing corona discharge. This not only increases transmission losses but also easily leads to complaints from residents near the lines regarding electromagnetic environment issues, significantly increasing the maintenance and operating costs for power grid operators. Furthermore, the long-term accumulation of contaminants accelerates the aging and corrosion of the conductor's metallic materials, causing conductor strand breakage, abnormal overheating, and even power outages, seriously threatening the safe and stable operation of the power grid. Therefore, regular cleaning of overhead transmission lines is an important part of line maintenance.

[0003] Currently, the cleaning and maintenance of overhead power lines in the power industry typically involves shutting off the power and then manually climbing the transmission towers for cleaning and maintenance. This method suffers from high labor costs, significant construction risks, substantial power outage losses, and low efficiency. Therefore, there is an urgent need in this field for a method and apparatus that can automatically clean contaminants from the surface of overhead power lines while maintaining power supply, without affecting the normal power transmission and operation of the transmission lines. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a corona cleaning device and method for overhead conductors that can be used for live automatic cleaning of dirt on the surface of overhead conductors without affecting the normal power transmission and operation of the transmission line.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide a corona cleaning device for the surface of a conductor, comprising: The housing has a through hole in its axial direction for wires to pass through; A corona discharge unit is disposed inside the housing and arranged in a circumferential ring along the through hole, and is used to generate corona plasma surrounding the wire under the action of the potential difference formed between the wire and the corona discharge unit. The self-powered unit is electrically connected to the corona discharge unit and is used to extract energy from the conductor and provide the corona discharge unit with a continuous DC voltage to maintain corona discharge. A walking mechanism, connected to the housing, is used to move the device along the overhead conductor.

[0006] Furthermore, the corona discharge unit includes a needle ring sleeve coaxially disposed within the housing and a plurality of metal needles uniformly disposed circumferentially along the needle ring sleeve. The metal needles are radially inserted through the needle ring sleeve, with the tips of the metal needles facing the axis of the through hole. The distance between the tips of the metal needles and the surface of the conductor is adjustable to change the intensity of the corona discharge.

[0007] Furthermore, the self-powered unit includes an induction core sleeved on the conductor, a power-harvesting winding wound on the induction core, and a rectifier circuit electrically connected to the power-harvesting winding. The DC output terminal of the rectifier circuit is electrically connected to the metal needle to provide a DC voltage for maintaining corona discharge to the metal needle.

[0008] Furthermore, the rectifier circuit is configured as a half-wave rectifier circuit, which includes a rectifier silicon stack, a rectifier resistor, and a voltage regulator capacitor. The positive terminal of the rectifier silicon stack is electrically connected to the first end of the energy harvesting winding, the negative terminal of the rectifier silicon stack is electrically connected to the metal pin through the rectifier resistor, one end of the voltage regulator capacitor is electrically connected to the second end of the energy harvesting winding, and the other end of the voltage regulator capacitor is electrically connected to the metal pin.

[0009] Furthermore, the walking mechanism includes a drive assembly fixedly disposed within the housing and used to clamp one side of the conductor, and a driven assembly slidably connected to the housing via an elastic pre-tightening assembly and used to clamp the other side of the conductor. The drive assembly and the driven assembly are capable of clamping the conductor. The moving speed of the walking mechanism is adjustable within the range of 0-10 mm / s.

[0010] Furthermore, the driven assembly includes a driven wheel and a first mounting bracket rotatably connected to the driven wheel, the first mounting bracket being slidably connected to the housing via the elastic preload assembly; The drive assembly includes a drive wheel, a geared motor, and a battery pack that powers the geared motor; the output shaft of the geared motor is connected to the axle of the drive wheel via a transmission structure.

[0011] Furthermore, the transmission structure includes a driving synchronous pulley fixedly connected to the output shaft of the geared motor, a driven synchronous pulley fixedly connected to the axle of the drive wheel, a synchronous belt wound around the driving synchronous pulley and the driven synchronous pulley, and a tensioning pulley for tensioning the belt.

[0012] Furthermore, the driving wheel and the driven wheel are arranged opposite each other along the radial direction of the wire. Both the driving wheel and the driven wheel are U-shaped wheels with grooves. The cross-section of the groove is an arc shape that matches the curvature of the cylindrical outer surface of the wire. When the driving wheel and the driven wheel are clamped on both sides of the wire, the wire is attached to the arc-shaped surface of the groove.

[0013] Furthermore, the elastic preload assembly includes a guide rail for slidingly connecting the driven assembly to the housing and an elastic structure for pressing the driven wheel against the conductor; the elastic structure includes a guide shaft and a spring sleeved on the guide shaft, one end of the spring abutting against the shoulder of the guide shaft, and the other end of the spring passing through the top plate abutting against the conductor.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is: to provide a method for corona cleaning of a conductor surface, which is implemented using the aforementioned conductor surface corona cleaning device, and includes the following steps: The corona cleaning device for the surface of the conductor is installed on the live conductor, so that the conductor passes through the through hole of the housing; By utilizing the potential spatial distribution around the conductor, a potential difference is formed between the corona discharge unit and the conductor, triggering corona discharge and generating plasma surrounding the surface of the conductor; The self-powered unit extracts energy from the conductor to provide a continuous DC voltage to the corona discharge unit, thereby maintaining stable corona discharge. The walking mechanism is controlled to move the device along the conductor to continuously clean the surface of the conductor.

[0015] The conductor surface cleaning device and method of the present invention have at least the following beneficial effects: It operates using the conductor's own operating voltage, achieving automatic cleaning without power outages, thus avoiding the economic losses and safety risks associated with traditional manual power outage cleaning methods; it can directly obtain energy from the live conductor through a self-powered unit to maintain corona discharge, eliminating the need for external power supplies or frequent battery replacements, allowing the device to operate autonomously on the transmission line for extended periods; its walking mechanism employs an elastic pre-tensioning and sliding guide design, automatically adapting to different conductor diameters and surface deposits, maintaining stable clamping and movement; its adjustable moving speed balances cleaning effect and efficiency; it utilizes plasma generated by corona discharge to actively decompose surface contaminants, resulting in more thorough cleaning compared to physical rinsing or wiping, especially effective at removing strongly adhering contaminants; integrating corona cleaning, self-powered operation, and walking functions, it can autonomously walk along the conductor to complete continuous cleaning operations, significantly reducing manual intervention and maintenance costs. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1This is a structural block diagram of one embodiment of the corona cleaning device for conductor surfaces according to the present invention.

[0017] Figure 2 This is a schematic diagram of one embodiment of the corona cleaning device for conductor surfaces according to the present invention.

[0018] Figure 3 This is an internal structural diagram of one embodiment of the corona cleaning device for conductor surfaces according to the present invention.

[0019] Figure 4 This is a schematic diagram of the potential distribution around the conductor.

[0020] Figure 5 This is a schematic diagram of the electric field distribution around the conductor.

[0021] Figure 6 A schematic diagram of the electric field distribution after installing a corona cleaning device on the conductor surface.

[0022] Figure 7 This is a schematic diagram illustrating the concentration of electric field at the tip of a metal needle and the generation of corona discharge.

[0023] Figure 8 This is a graph showing the linear relationship between the distance between the tip of the metal needle and the wire and the electric field strength at the tip.

[0024] Figure 9 The graph shows the linear relationship between the distance between the shell and the wire and the electric field strength at the needle tip.

[0025] Figure 10 The graph shows the linear relationship between the number of metal needles and the electric field strength at the needle tip.

[0026] Figure 11 This is a schematic diagram of the self-powered unit and its wires.

[0027] Figure 12 The waveform diagram shows the potential of the corona cleaning device on the surface of the conductor.

[0028] Figure 13 This is a schematic diagram of the walking mechanism.

[0029] Figure 14 This is a cross-sectional view of one embodiment of the corona cleaning device for conductor surfaces according to the present invention.

[0030] Figure 15 This is a flowchart of one embodiment of the corona cleaning method for the surface of the conductor according to the present invention.

[0031] The meanings of the labels in the attached diagram are as follows: Housing 100, through hole 101; corona discharge unit 200, needle ring sleeve 201, metal needle 202; self-powered unit 300, induction iron core 301, power harvesting winding 302, rectifier silicon stack 303, rectifier resistor 304, voltage stabilizing capacitor 305; walking mechanism 400, drive assembly 410, drive wheel 411, groove 411a, geared motor 412, battery pack 413, transmission structure 414, active synchronous wheel 41 4a, driven synchronous pulley 414b, synchronous belt 414c, tension pulley 414d, driven assembly 420, driven pulley 421, first mounting bracket 422, first side plate 422a, top plate 422b, elastic preload assembly 430, guide rail 431, elastic structure 432, guide shaft 432a, spring 432b, second mounting bracket 440, second side plate 441, bottom plate 442, positioning shaft 443; wire 500. Detailed Implementation

[0032] The invention will now be further described with reference to the accompanying drawings.

[0033] Please see Figure 1 and Figure 2 The present invention relates to a corona cleaning device for a conductor surface, comprising a housing 100, a corona discharge unit 200, a self-powered unit 300, and a walking mechanism 400. The housing 100 has a through hole 101 along its axial direction for the conductor 500 to pass through. The corona discharge unit 200 is disposed inside the housing 100 and arranged circumferentially along the through hole 101, and is used to generate corona plasma surrounding the conductor 500 under the influence of the potential difference formed between the conductor 500 and the corona discharge unit 200. The self-powered unit 300 is electrically connected to the corona discharge unit 200, and is used to extract energy from the conductor 500 and provide a continuous DC voltage to the corona discharge unit 200 to maintain corona discharge. The walking mechanism 400 is connected to the housing 100 to drive the device to move along the overhead conductor 500.

[0034] Please see Figure 3 The corona discharge unit 200 includes a needle ring sleeve 201 coaxially disposed within the housing 100 and the through hole 101, and a plurality of metal needles 202 uniformly arranged circumferentially along the needle ring sleeve 201. The metal needles 202 are radially inserted through the needle ring sleeve 201, with their tips pointing towards the axis of the through hole 101, i.e., towards the wire 500. The distance between the tips of the metal needles 202 and the surface of the wire 500 is adjustable to change the intensity of the corona discharge. The specific principle is as follows: Please see Figure 4This diagram illustrates the cross-section of conductor 500 (simplified here as a circular cross-section) and the potential distribution around conductor 500. The shaded circular portion represents the cross-section of conductor 500, and the black curves represent the potential distribution lines at different distances from conductor 500. The numbers marked on the curves are the numerical values ​​of the potentials, in kV. Figure 4 It can be seen that the surface potential of conductor 500 is the highest, approximately 9.7 kV, and the potential decreases with increasing distance from the surface of conductor 500, with the lowest potential shown in the figure being 4.3 kV. Please refer to [link / reference]. Figure 5 The diagram illustrates the cross-section of conductor 500 (simplified to a circular cross-section) and the electric field distribution around conductor 500. The shaded circular portion represents the cross-section of conductor 500, the black curve represents the electric field distribution around conductor 500, and the black arrows on the curve indicate the direction of decreasing electric field. According to the law of electromagnetic induction, the potential of a metal conductor (metal needle 202) in an electric field depends on the magnitude of the potential near the metal conductor and the conductor's geometry; the electric field strength of the metal conductor depends on its radius of curvature and its own potential. Therefore, by rationally designing the geometry of the metal conductor around conductor 500 and its spatial position relative to conductor 500, corona discharge plasma can be generated near conductor 500.

[0035] Figure 6 This is an electric field distribution diagram after a corona cleaning device was installed on conductor 500. Figure 7 This is a magnified schematic diagram of the tip region of the metal needle 202. The cross-section of the wire 500, the metal needle 202, and the housing 100 are marked as shown in the figure. A concentrated electric field can be generated at the tip of the metal needle 202, triggering corona discharge (e.g., Figure 7 (As shown in the black concentrated area). The key design parameters of the corona discharge unit 200 mainly include: the distance between the needle tip and the surface of the wire 500, the distance between the housing 100 and the wire 500, and the number of needle tips. After research, the influence of these key design parameters on the discharge electric field strength is as follows: Figure 8 , Figure 9 and Figure 10 As shown, the electric field strength at the needle tip increases with the increase of the distance between the needle tip and the surface of the wire 500; it also increases with the increase of the distance between the housing 100 and the surface of the wire 500; and the electric field strength at the needle tip decreases with the increase of the number of needle tips.

[0036] When the metal needle 202 generates corona discharge, its own potential decreases with the corona discharge, causing the potential difference between the metal needle 202 and the wire 500 to decrease, eventually causing the corona discharge to stop and lose its continuity. To improve the continuity of the corona discharge of the metal needle 202, this solution designs a self-powered unit 300.

[0037] Please see Figure 11The self-powered unit 300 includes an induction core 301 sleeved on the conductor 500, an energy harvesting winding 302 wound on the induction core 301, and a rectifier circuit electrically connected to the energy harvesting winding 302. The DC output terminal of the rectifier circuit is electrically connected to the metal needle 202 to provide a DC voltage for maintaining corona discharge on the metal needle 202. The rectifier circuit is configured as a half-wave rectifier circuit, including a rectifier silicon stack 303, a rectifier resistor 304, and a voltage regulator capacitor 305. The positive terminal of the rectifier silicon stack 303 is electrically connected to the first terminal of the energy harvesting winding 302, the negative terminal of the rectifier silicon stack 303 is electrically connected to the metal needle 202 through the rectifier resistor 304, one end of the voltage regulator capacitor 305 is electrically connected to the second terminal of the energy harvesting winding 302, and the other end of the voltage regulator capacitor 305 is electrically connected to the metal needle 202.

[0038] The conductor 500 passes through the center of the induction core 301, and according to the law of electromagnetic induction, an induced electromotive force in phase with the conductor 500 is generated in the energy harvesting winding 302. After passing through a half-wave rectifier circuit, a stable DC voltage is formed and supplied to the metal needle 202, ensuring that the metal needle 202 can continuously generate corona discharge. According to the law of electromagnetic induction, the induced voltage generated through the energy harvesting winding 302 can be obtained as follows:

[0039] in, Indicates the induced voltage. This indicates the line frequency, which is 50Hz. This indicates the number of turns in the 302 winding. This indicates the cross-sectional area of ​​the induction core 301. This indicates a current of 500 ohms in the conductor. This indicates the permeability of the induction core 301. Indicates the length of the magnetic circuit.

[0040] Assume that the amount of charge delivered by the energy-gathering winding 302 to the voltage-stabilizing capacitor 305 per unit time is It can be determined that the voltage fluctuation value at the tip of metal needle 202 is:

[0041] After corona discharge occurs at the needle tip, the remaining stable voltage at the needle tip is:

[0042] During the discharge process, the charge stored on the capacitor Continuously consumed by the needle tip, making Increase, remaining stable voltage at the needle tip A decrease in voltage may cause the corona discharge to become unsustainable. Therefore, the induced voltage at the energy extraction winding 302 and the voltage stabilizing capacitor 305 should be increased. According to the formula for calculating the induced voltage, the number of windings in the induction core 301 should be increased, a core material with higher permeability should be used, and the cross-sectional area of ​​the core should be increased.

[0043] Please see Figure 12 The long dashed line, solid line, dotted line, and short dashed line represent the potential of conductor 500, the induced potential (see Section 1 for the induction principle), the actual potential of metal needle 202, and the rectified potential output by self-powered unit 300, respectively. It is evident that the main function of self-powered unit 300 is to superimpose a DC potential (short dashed line) at the needle tip, further increasing the actual potential of metal needle 202, thereby enhancing the residual potential at the needle tip during corona discharge and maintaining the continuous generation of corona discharge.

[0044] Please see Figure 3 , Figure 13 and Figure 14 The walking mechanism 400 includes a drive assembly 410 fixedly disposed in the housing 100 and used to clamp one side of the wire 500, and a driven assembly 420 slidably connected to the housing 100 via an elastic pre-tightening assembly 430 and used to clamp the other side of the wire 500. The drive assembly 410 and the driven assembly 420 are capable of clamping the wire 500.

[0045] The drive assembly 410 includes a drive wheel 411, a geared motor 412, and a battery pack 413 that powers the geared motor 412. The output shaft of the geared motor 412 is connected to the axle of the drive wheel 411 via a transmission structure 414. The transmission structure 414 includes a driving synchronous pulley 414a fixedly connected to the output shaft of the geared motor 412, a driven synchronous pulley 414b fixedly connected to the axle of the drive wheel 411, a synchronous belt 414c wound around the driving synchronous pulley 414a and the driven synchronous pulley 414b, and a tensioning pulley 414d for tensioning the belt. The drive wheel 411 is mounted inside the housing 100 via a second mounting bracket 440. The second mounting bracket 440 includes two second side plates 441 rotatably connected to both ends of the axle of the drive wheel 411, a base plate 442 fixedly connected to the lower ends of the two second side plates 441, and a positioning shaft 443 fixedly connected to the housing 100.

[0046] The driven assembly 420 includes a driven wheel 421 and a first mounting bracket rotatably connected to the driven wheel 421. The first mounting bracket is slidably connected to the housing 100 via the elastic preload assembly 430. The first mounting bracket includes two first side plates rotatably connected to both ends of the axle of the driven wheel 421 and a top plate 422b fixedly connected to the upper ends of the two first side plates. The elastic preload assembly 430 includes a guide rail 431 for sliding the driven assembly 420 vertically to the housing 100 and an elastic structure 432 for pressing the driven wheel 421 against the conductor 500. The elastic structure 432 includes a guide shaft 432a and a spring 432b sleeved on the guide shaft 432a. One end of the spring 432b abuts against the shoulder of the guide shaft 432a, and the other end of the spring 432b passes through the top plate 422b and abuts against the conductor 500. In this embodiment, two guide rails 431 are symmetrically arranged on both sides of the elastic structure 432 along the direction of the conductor 500.

[0047] The purpose of designing the driven component 420 based on the sliding connection between the elastic pre-tensioning component 430 and the housing includes: ① The diameters of the wires 500 vary, and their surfaces may be covered with dirt layers of varying thicknesses. Under the pre-tensioning force of the elastic pre-tensioning component 430, the sliding driven component 420 can automatically adjust its position, ensuring that the driven wheel 421 always presses against the wire 500. When the diameter of the wire 500 is large or its surface has protrusions, the driven wheel 421 is lifted, compressing the spring 432b; conversely, the spring 432b pushes the driven wheel 421 downward, allowing the device to adapt to different specifications of wires 500 and complex surface conditions, maintaining effective clamping at all times. ② Ensuring that the drive wheel 411 obtains sufficient traction friction to move the entire device and prevent slippage. ③ When the device encounters slight unevenness, joints, or vibrations on the wire 500, this structure can absorb the impact, avoiding jamming, bouncing, or damage caused by rigid collisions, thereby ensuring stable movement.

[0048] The driving wheel 411 and the driven wheel 421 are arranged opposite each other along the radial direction of the conductor 500. Both the driving wheel 411 and the driven wheel 421 are U-shaped wheels with grooves 411a. The cross-section of the grooves 411a is an arc shape that matches the curvature of the cylindrical outer surface of the conductor 500. When the driving wheel 411 and the driven wheel 421 are clamped on both sides of the conductor 500, the conductor 500 is attached to the arc-shaped surface of the grooves 411a.

[0049] To balance cleaning effectiveness and efficiency, the moving speed of the corona cleaning device 400 on the surface of the conductor 500 is designed to be adjustable within the range of 0-10 mm / s (e.g., via an electronic control board). For heavy, stubborn dirt, the speed can be reduced (e.g., to close to 0-2 mm / s) to allow the corona discharge plasma to act on the local area for a longer time, ensuring that the dirt is fully decomposed and removed, thus improving the thoroughness of the cleaning. For light dirt, the speed can be appropriately increased for faster passage, improving the overall efficiency of the cleaning operation.

[0050] This invention also discloses a method for corona cleaning of a conductor surface, which is implemented based on the conductor surface corona cleaning device described in the above embodiments. Please refer to... Figure 15 An embodiment of the corona cleaning method for the surface of the conductor of the present invention includes the following steps: S100. The corona cleaning device on the surface of the conductor is installed on the live conductor 500, so that the conductor 500 passes through the through hole 101 of the housing 100.

[0051] S200: Utilizing the potential spatial distribution around the conductor 500, a potential difference is formed between the corona discharge unit 200 and the conductor 500, triggering corona discharge and generating plasma surrounding the surface of the conductor 500. The intensity of the corona discharge can be changed by adjusting the distance between the tip of the metal needle 202 and the surface of the conductor 500.

[0052] S300: Energy is extracted from the conductor 500 by the self-powered unit 300 to provide a continuous DC voltage to the corona discharge unit 200, thereby maintaining stable corona discharge. To maintain corona discharge, the number of windings in the induction core 301 can be increased, a core material with higher permeability can be used, and the cross-sectional area of ​​the core can be increased.

[0053] S400: Control the traveling mechanism 400 to move the device along the guide wire 500 to continuously clean the surface of the guide wire 500. The traveling speed of the traveling mechanism 400 is adjustable within the range of 0-10 mm / s. For heavy or stubborn dirt, the speed can be reduced (e.g., close to 0-2 mm / s) to allow the corona discharge plasma to act on the local area for a longer time, ensuring that the dirt is fully decomposed and removed, thus improving the thoroughness of the cleaning. For light dirt, the speed can be appropriately increased to pass through quickly and improve the overall efficiency of the cleaning operation.

[0054] This invention utilizes the conductor's own operating voltage to achieve automatic cleaning without power outages, avoiding the economic losses and safety risks associated with traditional manual power-off cleaning methods. Through a self-powered unit, energy can be directly obtained from the live conductor to maintain corona discharge, eliminating the need for external power supplies or frequent battery replacements, allowing the device to operate autonomously on power transmission lines for extended periods. The walking mechanism employs an elastic pre-tensioning and sliding guide design, automatically adapting to different conductor diameters and surface deposits, maintaining stable clamping and movement. Adjustable movement speed balances cleaning effectiveness and efficiency. The plasma generated by corona discharge actively decomposes surface contaminants on the conductor, resulting in a more thorough cleaning compared to physical rinsing or wiping, especially effective against strongly adhering contaminants. Integrating corona cleaning, self-powered operation, and walking functions, the device can autonomously move along the conductor to complete continuous cleaning operations, significantly reducing manual intervention and maintenance costs.

[0055] The above description merely illustrates preferred embodiments of the present invention and is quite specific and detailed; however, it should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this invention should be determined by the appended claims.

Claims

1. A device for corona cleaning of wire surfaces, characterized in that, include: The housing has a through hole in its axial direction for wires to pass through; A corona discharge unit is disposed inside the housing and arranged in a circumferential ring along the through hole, and is used to generate corona plasma surrounding the wire under the action of the potential difference formed between the wire and the corona discharge unit. The self-powered unit is electrically connected to the corona discharge unit and is used to extract energy from the conductor and provide the corona discharge unit with a continuous DC voltage to maintain corona discharge. A walking mechanism, connected to the housing, is used to move the device along the overhead conductor.

2. The corona cleaning device for conductor surfaces as described in claim 1, characterized in that: The corona discharge unit includes a needle ring sleeve coaxially disposed within the housing and a plurality of metal needles uniformly disposed circumferentially along the needle ring sleeve. The metal needles are radially inserted through the needle ring sleeve, with the tips of the metal needles facing the axis of the through hole. The distance between the tips of the metal needles and the surface of the conductor is adjustable to change the intensity of the corona discharge.

3. The corona cleaning device for conductor surfaces as described in claim 2, characterized in that: The self-powered unit includes an induction core sleeved on the conductor, a power-harvesting winding wound on the induction core, and a rectifier circuit electrically connected to the power-harvesting winding. The DC output terminal of the rectifier circuit is electrically connected to the metal needle to provide a DC voltage for maintaining corona discharge to the metal needle.

4. The corona cleaning device for conductor surfaces as described in claim 3, characterized in that: The rectifier circuit is configured as a half-wave rectifier circuit, which includes a rectifier silicon stack, a rectifier resistor, and a voltage regulator capacitor. The positive terminal of the rectifier silicon stack is electrically connected to the first end of the energy harvesting winding, and the negative terminal of the rectifier silicon stack is electrically connected to the metal pin through the rectifier resistor. One end of the voltage regulator capacitor is electrically connected to the second end of the energy harvesting winding, and the other end of the voltage regulator capacitor is electrically connected to the metal pin.

5. The corona cleaning device for conductor surfaces as described in claim 1, characterized in that: The walking mechanism includes a drive assembly fixedly disposed in the housing and used to clamp one side of the conductor, and a driven assembly slidably connected to the housing via an elastic pre-tightening assembly and used to clamp the other side of the conductor. The drive assembly and the driven assembly are capable of clamping the conductor. The moving speed of the walking mechanism is adjustable within the range of 0-10 mm / s.

6. The corona cleaning device for conductor surfaces as described in claim 5, characterized in that: The driven component includes a driven wheel and a first mounting bracket rotatably connected to the driven wheel, the first mounting bracket being slidably connected to the housing via the elastic preload component; The drive assembly includes a drive wheel, a geared motor, and a battery pack that powers the geared motor; the output shaft of the geared motor is connected to the axle of the drive wheel via a transmission structure.

7. The corona cleaning device for conductor surfaces as described in claim 6, characterized in that: The transmission structure includes a driving synchronous pulley fixedly connected to the output shaft of the geared motor, a driven synchronous pulley fixedly connected to the axle of the drive wheel, a synchronous belt wound around the driving synchronous pulley and the driven synchronous pulley, and a tensioning pulley for tensioning the belt.

8. The corona cleaning device for conductor surfaces as described in claim 6, characterized in that: The driving wheel and the driven wheel are arranged opposite each other along the radial direction of the conductor. Both the driving wheel and the driven wheel are U-shaped wheels with grooves. The cross-section of the groove is an arc shape that matches the curvature of the cylindrical outer surface of the conductor. When the driving wheel and the driven wheel are clamped on both sides of the conductor, the conductor is attached to the arc-shaped surface of the groove.

9. The corona cleaning device for conductor surfaces as described in claim 5, characterized in that: The elastic preload assembly includes a guide rail for sliding the driven assembly and the housing vertically and vertically, and an elastic structure for pressing the driven wheel against the conductor; the elastic structure includes a guide shaft and a spring sleeved on the guide shaft, one end of the spring abutting against the shoulder of the guide shaft, and the other end of the spring passing through the top plate abutting against the conductor.

10. A method for corona cleaning of a conductor surface, characterized in that, The process is achieved using the corona cleaning device for the surface of the conductor as described in any one of claims 1-9, and includes the following steps: The corona cleaning device for the surface of the conductor is installed on the live conductor, so that the conductor passes through the through hole of the housing; By utilizing the potential spatial distribution around the conductor, a potential difference is formed between the corona discharge unit and the conductor, triggering corona discharge and generating plasma surrounding the surface of the conductor; The self-powered unit extracts energy from the conductor to provide a continuous DC voltage to the corona discharge unit, thereby maintaining stable corona discharge. The walking mechanism is controlled to move the device along the conductor to continuously clean the surface of the conductor.

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