High-voltage direct-current gil insulator surface charge measurement platform and measurement method

Abstract

The application discloses a high-voltage direct-current GIL insulator surface charge measuring platform and a measuring method, wherein the measuring platform comprises a transverse sliding table, a longitudinal sliding table, a radial sliding table, a first stepping motor for controlling an electrostatic probe at one end of a rotating shaft to rotate around the axis of the rotating shaft, a second stepping motor for adjusting the rotating angle of the electrostatic probe and controlling the electrostatic probe to be perpendicular to the surface of the measured insulator, and a control element for controlling the transverse sliding table to move so that the electrostatic probe moves to the surface of the insulator, controlling the longitudinal sliding table and the radial sliding table to make the electrostatic probe perform circular motion around the central axis of the pipe, and controlling the second stepping motor to adjust the rotating angle of the electrostatic probe while the first stepping motor drives the rotating shaft to rotate around the axis of the rotating shaft, so that the electrostatic probe is perpendicular to the surface of the measured insulator, and the surface charge of the insulator is measured by rotating the electrostatic probe. The surface charge of the whole insulator can be measured, and the effectiveness and accuracy are relatively high.

Description

Technical Field

[0001] This application relates to the field of insulator surface charge measurement technology, and in particular to a high-voltage DC GIL insulator surface charge measurement platform and measurement method. Background Technology

[0002] Epoxy resin possesses superior electrical and mechanical properties and is widely used in gas-insulated lines (GILs). Epoxy resin insulators, in particular, serve to support the operating conductors and provide electrical insulation, making them a crucial component of GILs. To improve the insulation strength of insulators, nanoparticles such as Al₂O₃, TiO₂, and C₆O are doped into the epoxy resin, thereby increasing the material's volume resistivity. While nanoparticle-modified insulators can meet the insulation requirements of AC GILs, they remain the weakest link in DC GIL insulation due to surface charge accumulation. This is primarily because the surface charge on high-resistivity epoxy resin insulators dissipates extremely slowly. Accumulated surface charge distorts the original electric field, reducing flashover voltage. Therefore, it is necessary to establish a surface charge measurement platform for insulators to further investigate the accumulation pathways and dissipation mechanisms of the charge.

[0003] To measure the surface charge of GIL insulators, frustum-shaped insulators were initially adopted. The height and rotation angle of the insulator were adjusted by a controller, driver, and stepper motor, combined with the horizontal position of the electrostatic probe, to measure the surface charge. However, the surface charge distribution is inevitably affected by the insulator's geometry. Therefore, scaled-down basin-shaped insulators were gradually adopted. The insulator under test is installed in a flange made of insulating material, with a built-in rotary track to improve the stability of the insulator's rotation. Furthermore, a gear shaft is used to adjust the position of the conductive rod in real time to avoid the influence of the shielding electrode at the insulator busbar end on the surface charge measurement system. Ye Sanpai et al. established a basin-shaped insulator surface charge measurement system using a rotary adjustment mechanism. This system mainly consists of axial, radial, and rotary adjustment mechanisms, which can adjust the axial position, radial angle, and rotation angle of the electrostatic probe to achieve the measurement of the entire insulator surface charge. In addition, the system is designed with an extendable folding rod to protect the electrostatic probe.

[0004] The surface charge measurement system for basin-type insulators is made of aluminum alloy, which easily distorts the original electric field distribution inside the test pipe and may even trigger partial discharge. Partial discharge is a major source of surface charge accumulation, thus reducing the effectiveness of the test. Therefore, this system poses a significant safety hazard and has low test effectiveness. Furthermore, during the measurement process, the electrostatic probe rotates around its circumference but lacks necessary self-rotation. Therefore, it cannot be guaranteed that the electrostatic probe remains perpendicular to the insulator surface, resulting in low measurement accuracy. Summary of the Invention

[0005] This application provides a high-voltage DC GIL insulator surface charge measurement platform and method, which can realize the measurement of the surface charge of the entire insulator with high effectiveness and accuracy.

[0006] The first aspect of this application provides a high-voltage DC GIL insulator surface charge measurement platform, comprising:

[0007] A transverse slide stage that controls the horizontal position of an electrostatic probe used to detect surface charges;

[0008] A longitudinal slide table, connected to the transverse slide table, controls the vertical position of the electrostatic probe;

[0009] A radial slide, connected to the longitudinal slide, controls the radial position of the electrostatic probe;

[0010] The first stepper motor is connected at one end to the radial slide and at the other end to one end of the rotating shaft to control the electrostatic probe at the other end of the rotating shaft to rotate around the axis of the rotating shaft itself.

[0011] The second stepper motor is connected to the electrostatic probe to adjust the rotation angle of the electrostatic probe and control the electrostatic probe to be perpendicular to the surface of the insulator being tested.

[0012] A control unit, connected to the transverse slide, the longitudinal slide, the radial slide, the first stepper motor, and the second stepper motor, is used to control the movement of the transverse slide to move the electrostatic probe to the surface of the insulator, control the longitudinal and radial slides to make the electrostatic probe rotate around the central axis of the pipe, and control the first stepper motor to drive the rotating shaft to rotate around its own axis while controlling the second stepper motor to adjust the rotation angle of the electrostatic probe so that the electrostatic probe is perpendicular to the surface of the insulator being measured, so as to measure the surface charge of the insulator by rotating the electrostatic probe.

[0013] Optionally, in one embodiment of this application, the rotating shaft is a segmented hollow thin-walled aluminum tube.

[0014] Optionally, in one embodiment of this application, it further includes: a motor mounting base, which is disposed at one end of the rotating shaft near the radial slide to fix the first stepper motor.

[0015] Optionally, in one embodiment of this application, it further includes: a probe mounting base, the probe mounting base being disposed at one end of the rotation axis away from the radial slide, to fix the electrostatic probe and the second stepper motor.

[0016] A second aspect of this application provides a surface charge T-type test pipe, comprising: a T-type pipe;

[0017] A shielding mechanism is installed at the end of the T-shaped pipe. The shielding mechanism is located between the insulator and the measuring platform and is arranged perpendicularly to the measuring platform to shield the original electric field distribution inside the test pipe from the measuring platform.

[0018] Optionally, in one embodiment of this application, the shielding mechanism is a grounded aluminum alloy circular plate.

[0019] Optionally, in one embodiment of this application, it further includes:

[0020] A bracket, which is connected to the shielding mechanism to support the shielding mechanism;

[0021] A first slide, connected to the bracket, is used to adjust the position of the shielding mechanism.

[0022] Optionally, in one embodiment of this application, it further includes: a third stepper motor, which is connected to the first slide to control the movement of the first slide.

[0023] The third aspect of this application provides a method for measuring the surface charge of a high-voltage DC GIL insulator. Utilizing the high-voltage DC GIL insulator surface charge measurement platform and the surface charge T-shaped test pipe described in the above embodiments, when pressure is applied to the pipe insulator, a shielding mechanism is used to shield the original electric field distribution inside the test pipe from the measurement platform. After the pressure is applied, the shielding structure is removed. The measurement method includes the following steps:

[0024] The transverse slide is controlled to move the electrostatic probe to the surface of the insulator;

[0025] The longitudinal and radial slides are controlled to make the electrostatic probe move in a circular motion around the central axis of the pipe. At the same time, the first stepper motor is controlled to drive the rotating shaft to rotate around its own axis, while the second stepper motor is controlled to adjust the rotation angle of the electrostatic probe so that the electrostatic probe is perpendicular to the surface of the insulator being tested.

[0026] The electrostatic probe is rotated to measure the charge on one circumference of the insulator surface. The position of the electrostatic probe is readjusted to measure the charge on the next circumference, until the charge on the entire surface of the insulator is measured.

[0027] A fourth aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to perform the high-voltage DC GIL insulator surface charge measurement method as described in the above embodiments.

[0028] The high-voltage DC GIL insulator surface charge measurement platform and method proposed in this application employ a T-shaped test pipe. An adjustable-position aluminum alloy plate shielding measurement system controls the original electric field distribution within the test pipe, preventing partial discharge phenomena in the measurement system. This ensures the insulation strength of the system and the effectiveness of the test. Furthermore, the rotation angle of the electrostatic probe bracket around itself is adjusted in real time to ensure the perpendicularity between the electrostatic probe and the insulator surface, improving measurement accuracy.

[0029] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0030] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 This is a schematic diagram of a high-voltage DC GIL insulator surface charge measurement platform provided according to an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of a surface charge T-type test pipe provided according to an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of a shielding mechanism provided according to an embodiment of this application;

[0034] Figure 4 This is a flowchart illustrating a method for measuring the surface charge of a high-voltage DC GIL insulator according to an embodiment of this application.

[0035] Figure 5 This is a schematic diagram of a high normal basin provided according to an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of a low normal basin provided according to an embodiment of this application;

[0037] Figure 7 This is a schematic diagram of the surface charge distribution of a high normal basin according to an embodiment of this application;

[0038] Figure 8This is a schematic diagram of a low normal basin surface charge distribution according to an embodiment of this application;

[0039] Figure 9 A schematic diagram of the structure of the electronic device provided in the application embodiment. Detailed Implementation

[0040] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0041] Figure 1 This is a schematic diagram of a high-voltage DC GIL insulator surface charge measurement platform provided according to an embodiment of this application.

[0042] like Figure 1 As shown, the high-voltage DC GIL insulator surface charge measurement platform includes: a transverse slide 1; a longitudinal slide 2; a radial slide 3; a first stepper motor 4; a second stepper motor 5; and a control unit ( Figure 1 (Not shown).

[0043] The horizontal slide 1 controls the horizontal position of the electrostatic probe 6 used to detect surface charge, thereby ensuring the safety of the probe.

[0044] The longitudinal slide 2 is connected to the transverse slide 1 to control the vertical position of the electrostatic probe 6.

[0045] The radial slide 3 is connected to the longitudinal slide 2 to control the radial position of the electrostatic probe 6.

[0046] One end of the first stepper motor 4 is connected to the radial slide 3, and the other end is connected to one end of the rotating shaft 7, so as to control the electrostatic probe 6 at the other end of the rotating shaft 7 to rotate around the axis of the rotating shaft 7 itself.

[0047] The second stepper motor 5 is connected to the electrostatic probe 6 to adjust the rotation angle of the electrostatic probe 6, control the electrostatic probe 6 to be perpendicular to the surface of the insulator being tested, and improve the accuracy of the measurement.

[0048] The control unit is connected to the transverse slide 1, the longitudinal slide 2, the radial slide 3, the first stepper motor 4, and the second stepper motor 5. It is used to control the movement of the transverse slide 1 so that the electrostatic probe 6 moves to the surface of the insulator, and to control the longitudinal slide 2 and the radial slide 3 so that the electrostatic probe 6 makes circular motion around the central axis of the pipe. At the same time, it controls the first stepper motor 4 to drive the rotating shaft 7 to rotate around its own axis, and controls the second stepper motor 5 to adjust the rotation angle of the electrostatic probe 6 so that the electrostatic probe 6 is perpendicular to the surface of the insulator being measured, so as to measure the surface charge of the insulator by rotating the electrostatic probe 6.

[0049] In the embodiments of this application, the control unit includes a control circuit consisting of a driver and a controller, which can adjust the position of the electrostatic probe.

[0050] Because the gap between the electrostatic probe and the surface of the insulator being measured is only about 3mm during the measurement process, the rotating shaft is made of segmented hollow thin-walled aluminum tube. By reducing its own weight, the wobbling of the end of the rotating shaft during movement is avoided, thus ensuring the safety of the electrostatic probe.

[0051] In the embodiments of this application, the high voltage DC GIL insulator surface charge measurement platform further includes: a motor mounting base 8, which is disposed at one end of the rotating shaft 7 near the radial slide 3 to fix the first stepper motor 4.

[0052] In an embodiment of this application, the high-voltage DC GIL insulator surface charge measurement platform further includes: a probe mounting base 9, which is disposed at one end of the rotating shaft 7 away from the radial slide 3, to fix the electrostatic probe 6 and the second stepper motor 5.

[0053] To ensure the electrostatic probe remains perpendicular to the surface of the insulator being measured during its circular motion, the probe is fixed to the end of the rotating shaft via a probe mounting base. The mounting base incorporates a second stepper motor, insulated by quartz glass, which allows adjustment of the probe's rotation angle, thereby improving measurement accuracy.

[0054] The high-voltage DC GIL insulator surface charge measurement platform proposed in this application embodiment can realize the circular motion of the electrostatic probe around the central axis of the test pipe, using concentric circles as the motion trajectory, and can measure the surface charge of the entire insulator. During the electrostatic probe measurement process, the angle of the electrostatic probe is adjusted by the stepper motor built into the probe mounting base, while simultaneously rotating synchronously around the rotation axis, thereby keeping the probe perpendicular to the measured surface and improving the accuracy of the measurement.

[0055] Next, referring to the accompanying drawings, a surface charge T-type test pipe according to an embodiment of this application is described.

[0056] like Figure 2 As shown, it includes a T-shaped pipe and a shielding mechanism disposed at the end of the T-shaped pipe. The shielding mechanism is disposed between the insulator and the measuring platform and is arranged perpendicularly to the measuring platform to shield the measuring platform from the distribution of the original electric field inside the test pipe.

[0057] In practice, surface charge accumulation on GIL insulators primarily originates from partial discharges at insulation defects inside the pipe, while the main body of the surface charge measurement system is constructed of aluminum alloy. The introduction of this measurement system can easily distort the original electric field distribution inside the pipe, and may even trigger partial discharges. Therefore, the design... Figure 2 The T-shaped test pipe is shown.

[0058] The entire measurement platform is integrated into the end of the test pipe, and electromagnetic shielding is achieved by a shielding mechanism. This shielding mechanism is arranged perpendicularly to the measurement platform. The shielding mechanism consists of grounded aluminum alloy circular plates, such as... Figure 3 As shown.

[0059] Optionally, in embodiments of this application, the surface charge T-shaped test pipe further includes: a support connected to the shielding mechanism to support the shielding mechanism; a first slide connected to the support to adjust the position of the shielding mechanism; and a third stepper motor connected to the first slide to control the movement of the first slide.

[0060] The surface charge measurement platform is integrated inside the T-shaped test pipe and electromagnetically shielded by a grounded aluminum plate. This maintains the original electric field distribution near the insulator and avoids the influence of partial discharge triggered by the measurement system on the test results. Therefore, the validity of the test is guaranteed.

[0061] like Figure 3 As shown, the aluminum alloy circular plate is connected to the slide table via a bracket, and its position is adjusted in real time using a stepper motor.

[0062] Next, referring to the accompanying drawings, a method for measuring the surface charge of a high-voltage DC GIL insulator according to an embodiment of this application is described.

[0063] like Figure 4 As shown, the high-voltage DC GIL insulator surface charge measurement method involves applying pressure to the pipeline insulator, using a shielding mechanism to shield the measurement platform of the original electric field distribution inside the test pipeline, and removing the shielding structure after the pressure is applied. The measurement method includes the following steps:

[0064] In step S101, the transverse slide is controlled to move the electrostatic probe to the surface of the insulator.

[0065] In step S102, while controlling the longitudinal slide and the radial slide to make the electrostatic probe move in a circle around the central axis of the pipe and controlling the first stepper motor to drive the rotating shaft to rotate around its own axis, the second stepper motor is controlled to adjust the rotation angle of the electrostatic probe so that the electrostatic probe is perpendicular to the surface of the insulator being tested.

[0066] In step S103, the charge on one circumference of the insulator is measured by rotating the electrostatic probe, and the position of the electrostatic probe is readjusted to measure the next circumference until the charge on the entire surface of the insulator is measured.

[0067] Specifically, before each test, the shielding aluminum plate is moved between the insulator and the measuring platform by a third stepper motor, thus avoiding distortion of the original electric field inside the pipeline by the measuring platform and ensuring the validity of the test. After pressurization, the shielding aluminum plate is removed. The electrostatic probe is moved to the vicinity of the insulator surface via the transverse slide of the measuring platform. The angle of the electrostatic probe is adjusted by the second stepper motor built into the probe mounting base to ensure that the probe is perpendicular to the surface of the insulator being measured. Then, the electrostatic probe moves in a circle around the central axis of the pipeline via longitudinal and radial slides. At the same time, the electrostatic probe rotates synchronously around the rotation axis to ensure that the probe is perpendicular to the surface being measured during the circular motion. After measuring one circle of the insulator surface, the position of the probe is readjusted to make the probe perpendicular to the surface being measured. Then, the measurement in the next circular direction begins. That is, the electrostatic probe uses concentric circles as its trajectory. Finally, the charge on the entire surface of the insulator is measured.

[0068] based on Figure 1 The measurement platform shown is for Figure 5 The high normal basin shown Figure 6 The surface charge distribution of the low normal basin after applying -160kV for one hour is shown below. Figure 7 (High Normal Basin) and Figure 8 (Low normal basin) is shown. The insulating gas is 0.45 MPa SF6. To avoid deviations caused by surface charge inversion calculations, the charge distribution is characterized by the surface potential of the insulator.

[0069] The high-voltage DC GIL insulator surface charge measurement platform and method proposed in this application employ a T-shaped test pipe. An adjustable-position aluminum alloy plate shielding measurement system controls the original electric field distribution within the test pipe, preventing partial discharge phenomena in the measurement system. This ensures the insulation strength of the system and the effectiveness of the test. Furthermore, the rotation angle of the electrostatic probe bracket around itself is adjusted in real time to ensure the perpendicularity between the electrostatic probe and the insulator surface, improving measurement accuracy.

[0070] Figure 9 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include:

[0071] The memory 901, the processor 902, and the computer program stored on the memory 901 and capable of running on the processor 902.

[0072] When the processor 902 executes the program, it implements the high-voltage DC GIL insulator surface charge measurement platform provided in the above embodiments.

[0073] Furthermore, electronic devices also include:

[0074] Communication interface 903 is used for communication between memory 901 and processor 902.

[0075] The memory 901 is used to store computer programs that can run on the processor 902.

[0076] The memory 901 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0077] If the memory 901, processor 902, and communication interface 903 are implemented independently, then the communication interface 903, memory 901, and processor 902 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 9 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0078] Optionally, in a specific implementation, if the memory 901, processor 902, and communication interface 903 are integrated on a single chip, then the memory 901, processor 902, and communication interface 903 can communicate with each other through an internal interface.

[0079] The processor 902 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0080] This embodiment also provides a computer-readable storage medium storing a computer program, characterized in that the program, when executed by a processor, implements the above-described high-voltage DC GIL insulator surface charge measurement platform.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0083] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0084] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0085] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

Claims

1. A high voltage direct current (HVDC) gas insulated line (GIL) insulator surface charge measurement platform, comprising: include: A transverse slide stage that controls the horizontal position of an electrostatic probe used to detect surface charges; A longitudinal slide table, connected to the transverse slide table, controls the vertical position of the electrostatic probe; A radial slide, connected to the longitudinal slide, controls the radial position of the electrostatic probe; The first stepper motor is connected at one end to the radial slide and at the other end to one end of the rotating shaft to control the electrostatic probe at the other end of the rotating shaft to rotate around the axis of the rotating shaft itself. The second stepper motor is connected to the electrostatic probe to adjust the rotation angle of the electrostatic probe and control the electrostatic probe to be perpendicular to the surface of the insulator being tested. A control component, connected to the transverse slide, the longitudinal slide, the radial slide, the first stepper motor, and the second stepper motor, is used to control the movement of the transverse slide to move the electrostatic probe to the surface of the insulator, control the longitudinal and radial slides to make the electrostatic probe rotate around the central axis of the pipe, and control the first stepper motor to drive the rotating shaft to rotate around its own axis while controlling the second stepper motor to adjust the rotation angle of the electrostatic probe so that the electrostatic probe is perpendicular to the surface of the insulator being measured, so as to measure the surface charge of the insulator by rotating the electrostatic probe. A motor mounting bracket is provided at one end of the rotating shaft near the radial slide to fix the first stepper motor; A probe mounting base is provided at one end of the rotating shaft away from the radial slide to fix the electrostatic probe and the second stepper motor. A surface charge T-type test pipe, wherein the surface charge T-type test pipe comprises: T-shaped pipe; A shielding mechanism is installed at the end of the T-shaped pipe. The shielding mechanism is located between the insulator and the measuring platform and is arranged perpendicularly to the measuring platform to shield the original electric field distribution inside the test pipe from the measuring platform. The shielding mechanism is a grounded aluminum alloy circular plate. A bracket, which is connected to the shielding mechanism to support the shielding mechanism; A first slide, connected to the bracket, is used to adjust the position of the shielding mechanism; A third stepper motor is connected to the first slide to control the movement of the first slide.

2. The platform of claim 1, wherein, The rotating shaft is a segmented hollow thin-walled aluminum tube.

3. A method for measuring surface charge of a high voltage direct current (HVDC) gas insulated line (GIL) insulator, using the platform for measuring surface charge of a high voltage direct current (HVDC) gas insulated line (GIL) insulator according to any one of claims 1-2, characterized in that, When pressure is applied to the pipeline insulator, the original electric field distribution inside the test pipeline is shielded by a shielding mechanism. After the pressure is applied, the shielding mechanism is removed. The measurement method includes the following steps: The transverse slide is controlled to move the electrostatic probe to the surface of the insulator; The longitudinal and radial slides are controlled to make the electrostatic probe move in a circular motion around the central axis of the pipe. At the same time, the first stepper motor is controlled to drive the rotating shaft to rotate around its own axis, while the second stepper motor is controlled to adjust the rotation angle of the electrostatic probe so that the electrostatic probe is perpendicular to the surface of the insulator being tested. The position of the electrostatic probe is readjusted for the measurement of the next circumference until the measurement of the whole surface charge of the insulator is realized.

4. An electronic device, comprising: Comprise: A memory, a processor and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the high-voltage direct-current GIL insulator surface charge measurement method of claim 3.

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