A system and method of operation for dissipating surface charge on an insulator

Abstract

The application belongs to the technical field of charge dispersion, and discloses a system and working method for dispersing surface charge of insulators. The local AC power supply of a converter station is converted into DC power by a rectifier. A damping circuit is connected between the output end of the rectifier and the input end of a switch module. A controller is connected to the control port of the rectifier and each switch module. The controller changes the output current of the rectifier by adjusting the current signal, and then controls the magnetic field strength generated by the excitation coil of the dispersion device. The controller controls the on-off of each switch module by the closing and opening signal, so that the excitation coil of the corresponding dispersion device is powered or loses power. The magnetic field strength is adjusted or the magnetic field is turned off according to the actual operation condition of the DC GIS. The dispersion device adopts a hollow semicircular excitation coil matched with a half-moon strip plate, which is connected with a sealed shell by bolts to form a circular ring, and can be conveniently sleeved on the outer ring of the metal flange of the basin-type insulator, and is convenient to install and disassemble, without the need of structural modification of the original equipment.

Description

Technical Field

[0001] This invention belongs to the field of charge dissipation technology, specifically a system and working method for dissipating surface charges of insulators. Background Technology

[0002] Gas-insulated switchgear (GIS) is a core component of DC transmission systems, and its operational reliability directly impacts grid security. The pot-type insulator, as the most critical insulating component in DC GIS, performs multiple functions, including isolating the gas chamber, supporting the conductor, and providing insulation to ground.

[0003] Under long-term unipolar voltage operation, charged particles gradually accumulate on the surface of DC GIS insulators, distorting the surface electric field and easily inducing surface flashover, seriously threatening equipment safety. Existing methods are insufficient to dynamically and actively suppress charge accumulation during long-term operation.

[0004] Current approaches to addressing surface charge accumulation in insulators primarily focus on optimizing insulator material formulations and improving structural design to achieve a uniform electric field. These methods all address the insulator's inherent or passive physical characteristics. The closest existing technology is Chinese patent CN114038636A, "Device for Reducing Surface Charge Accumulation in Basin-Type Insulators." This device involves installing an open pipe clamp on the outer pipe of a basin-type insulator. A pair of magnet mounting seats are fixed to the side wall of the clamp, and a pair of ring magnets are mounted on the mounting seats via shock-absorbing damping pads to form a fixed magnetic field, attempting to reduce charge accumulation through the magnetic field.

[0005] The aforementioned existing technologies use permanent magnets as magnetic field generating devices, which can only produce a constant magnetic field. The presence and strength of the magnetic field cannot be adjusted or shut off in real time according to the actual operating conditions of the DC GIS (such as voltage level, load changes, ambient temperature and humidity), lacking proactive controllability and making it difficult to adapt to the charge dispersal effect requirements under different operating conditions. Overall, existing technologies lack a dynamically adjustable and proactively intervened charge dispersal solution. Summary of the Invention

[0006] This invention provides a system and method for dispersing surface charge on insulators, solving the problems of existing technologies that cannot be adjusted or shut down in real time according to the actual operating conditions of DC GIS, lack of active controllability, and difficulty in adapting to the charge dispersal effect under different operating conditions.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a system for dissipating surface charge on an insulator, comprising: Local AC power supply for converter station; A rectifier, the AC input terminal of which is connected to the output terminal of the local AC power supply of the converter station; a damping circuit, the input terminal of which is connected to the DC output terminal of the rectifier; A switching module, wherein the input terminal of the switching module is connected in parallel to the output terminal of the damping circuit; A dispersing device, the dispersing device including an excitation coil, the input and output terminals of the excitation coil being connected to the output terminal of the switching module respectively; The controller includes a first control signal output terminal and a second control signal output terminal. The first control signal output terminal of the controller is connected to the control port of the rectifier, and the second control signal output terminal of the controller is connected to the control terminal of each switching module.

[0008] According to one embodiment of the present invention, the dispersing device further includes a damping pad, a sealing shell, and a semi-circular bar; the excitation coil is made of copper wire wrapped with insulation and has a hollow semi-circular structure, which is wrapped by the damping pad; the sealing shell has a semi-circular structure, and its hollow area is filled by the damping pad and the excitation coil. The sealing shell has two outlets in the middle for the coil inlet and outlet wires to be led out, and threaded holes are provided on both sides of the sealing shell; the semi-circular bar has through holes on both sides and is connected to the threaded holes of the sealing shell by bolts, forming a circular ring with the sealing shell and fitting around the metal flange of the basin insulator.

[0009] According to one embodiment of the present invention, the DC current output by the rectifier is adjustable in the range of 100A to 500A.

[0010] According to one embodiment of the present invention, the switching module is a DC switch.

[0011] According to one embodiment of the present invention, the local AC power supply of the converter station is a 220V or 380V AC power supply.

[0012] This invention also provides a method for dispersing surface charge on insulators, comprising the following steps: AC power output from the local AC power supply of the converter station is rectified into DC power by a rectifier, and then, after passing through a damping circuit, provides excitation current to the excitation coils of each dispersing device through each switching module; the controller outputs a current regulation signal to adjust the magnitude of the DC current output by the rectifier, thereby controlling the magnetic field strength generated by the dispersing device; the controller outputs a circuit breaker signal to control the opening or closing of each switching module; when the switching module is in the closed state, the excitation coil of the corresponding dispersing device is energized and generates a magnetic field; when the switching module is in the open state, the excitation coil of the corresponding dispersing device is de-energized, and the magnetic field disappears.

[0013] According to one embodiment of the present invention, after the excitation coil is energized, a local magnetic field parallel to the surface of the insulator is formed on the surface of the insulator directly opposite the coil, and the direction of the magnetic field lines is parallel to the surface of the insulator.

[0014] According to one embodiment of the present invention, the direction of the magnetic field lines is perpendicular to the direction of motion of the space charge.

[0015] According to one embodiment of the present invention, the DC current output by the rectifier is 100A to 500A.

[0016] According to one embodiment of the present invention, the controller independently controls the opening or closing of any one of the switching modules, thereby realizing the independent start and stop of the designated dispersal device.

[0017] Compared with existing technologies, this invention has the following advantages: This invention provides a system for dispersing surface charges on insulators. The local AC power supply of the converter station is converted to DC power by a rectifier. A damping circuit is connected between the rectifier output terminal and the switch module input terminal. A controller is connected to the rectifier control port and the control terminals of each switch module. The controller changes the rectifier output current through a current regulation signal, thereby controlling the magnetic field strength generated by the excitation coil of the dispersing device. The controller independently controls the on / off state of each switch module through opening and closing signals, energizing or de-energizing the corresponding dispersing device's excitation coil, thus achieving independent start / stop control of each dispersing device. Compared with existing schemes that use permanent magnets to generate a fixed magnetic field, this device can adjust the magnetic field strength or shut down the magnetic field in real time according to the actual operating conditions of the DC GIS, possessing the advantages of active controllability and flexible adjustment. Simultaneously, a single system can connect multiple switch modules and dispersing devices in parallel to achieve batch charge dispersal at multiple insulator locations. The dispersing device uses a hollow semi-circular excitation coil in conjunction with a crescent-shaped bar plate, which is connected to the sealing shell by bolts to form a circular ring. It can be easily fitted onto the outer ring of the metal flange of the basin insulator, making installation and disassembly convenient without requiring structural modifications to the original equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a system for dispersing surface charge on an insulator according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the excitation coil structure according to an embodiment of the present invention; Figure 3This is a schematic diagram of an excitation coil wrapped with insulating material according to an embodiment of the present invention; Figure 4 This is a schematic diagram of an excitation coil wrapped with a damping pad according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the dispersing device according to an embodiment of the present invention; Figure 6 This is a partial schematic diagram of the dispersing device according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the dispersing device mounted on an insulator according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the magnetic field generated on the surface of the insulator by the dispersing device according to an embodiment of the present invention. The arrows in the diagram indicate the direction of the magnetic field. In the diagram, 1-excitation coil, 2-coil inlet, 3-coil outlet, 4-damping shock absorber, 5-sealed outer casing, 6-half-moon strip, 7-pot-type insulator Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components.

[0023] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, one embodiment of the present invention provides a system for dispersing surface charge on insulators, including a local AC power supply for a converter station, a rectifier, a damping circuit, at least one switching module, at least one dispersing device, and a controller.

[0025] The local AC power supply of the converter station is a standard low-voltage AC power supply within the converter station, and its output terminal is connected to the AC input terminal of the rectifier. The DC output terminal of the rectifier is connected to the input terminal of the damping circuit. The output terminal of the damping circuit is connected in parallel to the input terminals of multiple switching modules. The output terminal of each switching module is connected to the input and output terminals of the excitation coil in a dissipation device. The controller has a first control signal output terminal and a second control signal output terminal. The first control signal output terminal is connected to the control port of the rectifier and is used to adjust the magnitude of the DC current output by the rectifier; the second control signal output terminal is connected to the control terminal of each switching module and is used to independently control the opening or closing of each switching module.

[0026] In this embodiment, the rectifier converts AC power to DC power, and its output current is continuously adjustable over a wide range. The rectifier employs a phase-controlled rectification or PWM (Pulse Width Modulation) rectification topology, and the controller sends a current adjustment signal to the rectifier via analog or digital communication. A damping circuit, composed of resistors and inductors, is connected in series between the rectifier's positive output terminal and the switching module's input bus. It absorbs the reverse overvoltage generated when the excitation coil is de-energized, preventing the overvoltage from damaging the switching module or rectifier devices. The switching module uses DC contactors or solid-state DC switches, and each switch is independently controlled by the controller.

[0027] A single system can connect multiple switching modules and discharge devices in parallel to achieve simultaneous charge discharge of multiple basin insulators in a DC GIS. The discharge devices do not interfere with each other, and the start and stop of one discharge device does not affect the normal operation of other discharge devices.

[0028] like Figures 2 to 6 As shown, the dispersing device includes an excitation coil 1, a damping pad 4, a sealing shell 5, and a crescent plate 6.

[0029] like Figure 2 As shown, the excitation coil 1 is made of copper wire wrapped in insulation and has a hollow semi-circular structure. The coil is wound with multiple turns, and the number of turns and wire diameter are determined according to the required ampere-turns to ensure that sufficient magnetic field strength is generated under the rated excitation current. Figure 3 The excitation coil is shown encased in an insulating material with a high temperature resistance rating, and the inter-turn withstand voltage meets the requirements of DC high voltage. The coil retains coil inlet wire 2 and coil outlet wire 3, which are used to connect to the power supply circuit.

[0030] like Figure 4 As shown, the coil is encased and shaped by a damping pad 4. The damping pad 4 is made of an elastomer material, with an internal semi-circular cavity that matches the shape of the coil. The damping pad serves two purposes: first, it absorbs the mechanical vibration generated by the electromagnetic force when the coil is energized, reducing operating noise; second, it provides an elastic buffer between the coil and the sealed outer shell, preventing wear or insulation damage caused by hard contact.

[0031] like Figure 5As shown, the sealing housing 5 has a semi-circular structure, and its hollow interior is filled with damping and shock-absorbing pads 4 and excitation coil 1. The sealing housing 5 is made of non-magnetic, corrosion-resistant metal or high-strength engineering plastic. The sealing housing 5 has two outlets in the middle for the coil inlet 2 and coil outlet 3 to be led out. Waterproof connectors or rubber sleeves are provided at the outlets to prevent dust and moisture from entering. Each side of the sealing housing 5 has a threaded hole. The semi-circular half-moon plate 6 has a through hole on each side, which is connected to the threaded holes of the sealing housing 5 by bolts, forming a complete circular ring with the sealing housing 5. The inner diameter of this circular ring is adapted to the outer diameter of the outer ring of the basin-type insulator metal flange, allowing the dispersing device to fit tightly onto the flange outer ring.

[0032] Figure 6 The assembly relationship between the sealing housing 5, the crescent plate 6, and the metal flange of the pot-type insulator is further illustrated. The crescent plate 6 is attached to the outer edge of the flange, and after being tightened with bolts, there is no relative displacement between the entire dispersing device and the flange. Figure 7 The overall appearance of the dispersing device mounted on the basin insulator is shown, with the arc-shaped direction of the excitation coil 1 being concentric and adjacent to the surface contour of the insulator.

[0033] Based on the above system, the present invention provides a working method for dispersing surface charge of an insulator, comprising the following steps: Step S1: Power Supply and Rectification The converter station's local AC power supply outputs AC power, which is rectified into DC power by a rectifier. The controller outputs a current regulation signal to the rectifier's control port based on on-site operating conditions (such as DC GIS voltage level, load current, and ambient humidity) to adjust the magnitude of the rectifier's output DC current. In this embodiment, the controller can use a conventional adjustment algorithm to stabilize the output current at a set target value. The rectified DC current is then fed into a damping circuit.

[0034] Step S2: Damping and Power Distribution The damping circuit attenuates and buffers the current, suppressing the spike overvoltage generated by the line inductance during sudden current changes. The buffered DC current is distributed via the bus and simultaneously delivered to the input terminals of each parallel switching module.

[0035] Step S3: Independent Excitation Control The controller outputs opening and closing signals to the control terminals of each switch module, independently controlling the opening or closing of each module. When a certain dispersing device is required to operate, the controller closes the corresponding switch module, energizing the excitation coil; when the dispersing device is not required, the controller opens the corresponding switch module, de-energizing the excitation coil and eliminating the magnetic field. The state of each switch can be set independently, thereby achieving independent start-stop control of each dispersing device and adapting to the differentiated charge accumulation conditions of insulators at different locations on site.

[0036] Step S4: Magnetic field generation and charge dissipation like Figure 7 As shown, the dispersing device, through the circular ring formed by the semi-circular plate 6 and the sealing shell 5, fits around the outer ring of the metal flange of the basin-type insulator 7. The arc-shaped direction of the excitation coil 1 is concentric and close to the surface contour of the insulator. When the excitation coil is energized, a magnetic field is generated based on the principle of electromagnetism.

[0037] like Figure 8 As shown, after the coil is energized, a local magnetic field parallel to the insulator surface is formed in the region of the insulator surface directly opposite the coil. The arrows in the figure indicate the direction of the magnetic field lines. The direction of the magnetic field lines is parallel to the insulator surface and perpendicular to the direction of movement of space charges.

[0038] During the long-term operation of DC GIS, a large number of free charges (positive ions or electrons) exist in the space due to phenomena such as micro-discharge, conductor particle agitation, and electrode emission. Under the influence of a unipolar electric field, these charges migrate towards the insulator surface at a velocity approximately perpendicular to the insulator surface (normal direction). When the aforementioned magnetic field parallel to the insulator surface... Once established, the moving charge q will be subjected to a Lorentz force:

[0039] in, The amount of charge of the moving charge. Let be the vector of the Lorentz force acting on the moving charge. Let be the velocity vector of the charge relative to the magnetic field.

[0040] According to the right-hand rule, the direction of the Lorentz force is perpendicular to both the velocity and magnetic field directions, therefore it must point tangentially to the insulator surface (i.e., parallel to the surface and perpendicular to the original incident direction). This tangential force deflects the charges that were originally moving perpendicularly to the surface, causing them to deviate from their original trajectory towards the insulator surface, thus reducing or even preventing direct charge deposition on the insulator surface. Simultaneously, the deflected charges move tangentially along the insulator surface, further promoting the redistribution and neutralization of the accumulated charge. Because the hollow semi-circular structure of the excitation coil in this invention is tightly attached to the outer ring of the flange, the magnetic field it generates is mainly distributed in the annular region near the flange on the insulator surface, which is precisely the area where charge accumulation is most severe. By directionally dispersing the charge in this region, local electric field distortion can be significantly improved, reducing the probability of surface flashover.

[0041] In one possible implementation, the DC current output by the rectifier is continuously adjustable within a certain range. In practical applications, when the DC GIS is under low load or in a clean environment, the current can be adjusted to a smaller value to maintain basic dispersal capability; when under high load, high humidity, or when there is known active particulate matter, the current can be adjusted to a larger value to enhance the magnetic field strength and improve the dispersal effect. The controller can preset the correspondence between the current value and the operating conditions through the host computer software to achieve automatic adjustment.

[0042] In one possible implementation, the switching module is a DC switch. This embodiment selects a DC contactor whose rated voltage and current meet engineering requirements, and the electromagnetic coil is driven by the relay output of the controller. The auxiliary contacts of the switching module feed back the status to the controller, achieving closed-loop monitoring.

[0043] In one possible implementation, the local AC power supply of the converter station is taken from the station's power supply system, eliminating the need for an additional dedicated power supply and reducing system deployment costs.

[0044] In one possible implementation, after the excitation coil is energized, a local magnetic field parallel to the insulator surface is formed on the surface of the insulator directly opposite the coil, with the magnetic field lines parallel to the insulator surface. In this embodiment, the turns distribution and ampere-turns of the excitation coil are optimized through finite element simulation, so that in the region of the insulator surface directly opposite the coil, the tangential component of the magnetic field lines dominates, while the normal component is very small, thereby maximizing the dispersing effect of the Lorentz force.

[0045] In one possible implementation, the direction of the magnetic field lines is perpendicular to the direction of space charge movement. Since the electric field direction in a DC GIS is approximately perpendicular to the insulator surface, positive ions move along the electric field direction, and electrons move against the electric field direction; both their velocity directions are perpendicular to the insulator surface. The magnetic field direction of this invention is designed to be tangential, therefore the angle between the magnetic field lines and the charge movement direction is close to 90°, maximizing the Lorentz force and achieving the highest dissipation efficiency.

[0046] In one possible implementation, the DC current output by the rectifier is within a preferred range. This current range has been experimentally verified: when the current is too low, the magnetic field strength is insufficient to effectively deflect high-speed moving charges; when the current is too high, the coil heating increases significantly, requiring additional heat dissipation measures. Therefore, a reasonable selection of the current range can balance the dissipation effect with engineering feasibility.

[0047] In one possible implementation, the controller independently controls the opening or closing of any single switch module, enabling independent start / stop of a designated dispersing device. In engineering applications, if a basin-type insulator is under maintenance or its chamber has been depressurized, the operator can open the corresponding switch module of that dispersing device via the human-machine interface, preventing energy waste and temperature rise caused by prolonged coil energization. Simultaneously, dispersing devices in other locations can continue to operate normally without interference.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A system for dispersing surface charge on an insulator, characterized in that, include: Local AC power supply for converter station; A rectifier, wherein the AC input terminal of the rectifier is connected to the output terminal of the local AC power supply of the converter station; A damping circuit, the input terminal of which is connected to the DC output terminal of the rectifier; A switching module, wherein the input terminal of the switching module is connected in parallel to the output terminal of the damping circuit; The dispersing device includes an excitation coil (1), the input and output terminals of which are connected to the output terminal of the switching module. The controller includes a first control signal output terminal and a second control signal output terminal. The first control signal output terminal of the controller is connected to the control port of the rectifier, and the second control signal output terminal of the controller is connected to the control terminal of each switching module.

2. A system for dispersing surface charge of an insulator according to claim 1, characterized in that, The dispersing device also includes a damping pad (4), a sealing shell (5), and a crescent plate (6); the excitation coil (1) is made of copper wire wrapped with insulation and has a hollow semi-circular structure, which is wrapped by the damping pad (4) on the outside; the sealing shell (5) has a semi-circular structure, and its hollow area is filled by the damping pad (4) and the excitation coil (1). The sealing shell (5) has two outlets in the middle for the coil inlet and outlet wires to be led out, and threaded holes are provided on both sides of the sealing shell (5); the crescent plate (6) is semi-circular and has through holes on both sides. It is connected to the threaded holes of the sealing shell (5) by bolts and forms a circular ring with the sealing shell (5) around the metal flange of the basin insulator (7).

3. A system for dispersing surface charge of an insulator according to claim 1, characterized in that, The DC current output by the rectifier is adjustable in the range of 100A to 500A.

4. A system for dispersing surface charge of an insulator according to claim 1, characterized in that, The switching module is a DC switch.

5. A system for dispersing surface charge of an insulator according to claim 1, characterized in that, The local AC power supply for the converter station is either 220V or 380V AC power.

6. A method for dispersing surface charge on an insulator, characterized in that, A system for dispersing surface charge of an insulator according to any one of claims 1 to 5. Includes the following steps: The local AC power supply of the converter station outputs AC power, which is rectified into DC power by the rectifier, and then through the damping circuit and through each switching module to provide excitation current to the excitation coil (1) of each drive device. The controller outputs a current regulation signal to adjust the magnitude of the DC current output by the rectifier and control the magnetic field strength generated by the dispersing device; The controller outputs opening and closing signals to control the opening or closing of each switch module. When the switch module is in the closed state, the excitation coil (1) of the corresponding dispersing device is energized and generates a magnetic field. When the switch module is in the open state, the excitation coil (1) of the corresponding dispersing device is de-energized and the magnetic field disappears.

7. A method for dispersing surface charge of an insulator according to claim 6, characterized in that, After the excitation coil (1) is energized, a local magnetic field parallel to the surface of the insulator is formed on the surface of the insulator directly opposite the coil, and the direction of the magnetic field lines is parallel to the surface of the insulator.

8. A working method for dispersing surface charge of an insulator according to claim 7, characterized in that, The magnetic field lines are perpendicular to the direction of motion of the space charge.

9. A method for dispersing surface charge on an insulator according to claim 6, characterized in that, The rectifier outputs a DC current of 100A to 500A.

10. A method for dispersing surface charge of an insulator according to claim 6, characterized in that, The controller can independently control the opening or closing of any one of the switching modules, thereby enabling independent start and stop of the designated dispersal device.

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