Device and method for observing motion of metal particles in vertical shaft GIL

Abstract

The invention discloses a device and a method for observing motion of metal particles in a vertical shaft GIL, relates to the technical field of high-voltage transmission lines, and solves the problems that an existing observation device is limited in observation visual angle, poor in simulation authenticity and incapable of capturing particle motion when simulating a direct-current GIL vertical shaft environment. Comprising a cylindrical shell, an insulator, a transparent cover plate, a cylindrical guide rod, a metal particle placing table and a vertical shaft placing table, a half-side cylinder wall structure is reserved on the upper half part of the cylindrical shell along the axial direction to form an open observation area; the metal particle placing table is of an arc-shaped strip-shaped structure matched with the curvature of the inner wall of the shell and is welded to the center of the upper half side of the shell. The transparent cover plate is assembled on the top of the shell, the cylindrical guide rod penetrates through the through holes of the cover plate and the insulator, the device is mainly used for studying the motion characteristics of metal particles in the direct-current GIL shaft environment, and an experimental basis is provided for optimization of an insulation structure of high-voltage power equipment and formulation of a particle suppression strategy.

Description

Technical Field

[0001] This invention relates to the field of high-voltage transmission line technology, and in particular to a device and method for observing the movement of metal particles inside a vertical shaft GIL. Background Technology

[0002] In the field of gas-insulated transmission line (GIL) technology, especially for GILs arranged in vertical shafts under DC voltage, studying the motion behavior of internal metal particles in a strong electric field is crucial for ensuring insulation safety. Currently, related experimental research mainly relies on observation devices and methods for horizontally arranged GILs, or observation of simplified models placed vertically. These existing technologies generally employ fully enclosed or partially open cavity structures, severely limiting the field of view of observation equipment such as high-speed cameras. This makes it impossible to capture the three-dimensional motion trajectory of metal particles in the simulated vertical shaft space from all angles and continuously, resulting in significant blind spots. In particular, it is difficult to clearly record key behaviors such as collisions and adhesion between particles and the insulator surface and the shell interior. Furthermore, the particle-carrying platforms of existing devices are mostly designed as planar structures, which do not conform to the curved inner wall geometry of real vertical shaft GILs. This causes significant deviations in the initial attachment state, charging process, start-up conditions, and collision rebound dynamics of particles from actual engineering scenarios, resulting in insufficient physical authenticity of experimental data. At the same time, these devices also have limitations in simulating the accuracy of the coaxial electric field structure of real vertical shafts, the stability of the experimental electric field, and the reliability of high-voltage insulation. In summary, existing technologies are insufficient to construct an experimental platform that can both highly reproduce the complex structure and field distribution of vertical shaft GILs and achieve high-definition observation of the entire motion process without blind spots. This restricts in-depth research on the motion mechanism of metal particles in vertical shaft environments and the development of effective suppression measures. Summary of the Invention

[0003] The objective of this invention is to provide a device and method for observing the motion of metal particles inside a vertical shaft gas inlet (GIL), so as to achieve full-process, blind-spot-free, and visualized observation of the motion trajectory of metal particles under conditions that simulate the insulating gas environment, geometric structure, and electric field distribution of a real vertical shaft GIL.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a device for observing the movement of metal particles inside a vertical shaft GIL, comprising an experimental environment module, a vertical shaft model module, and an imaging module; The experimental environment module has a sealed pressure chamber and an observation window that allows observation inside the pressure chamber, and is equipped with inflation and deflation valves. The vertical shaft model module is set inside the pressure chamber and includes a cylindrical shell, a transparent cover plate, an insulator, a cylindrical guide rod, and a metal particle placement platform. The cylindrical shell, acting as a conductor, is vertically positioned within the pressure chamber, and the upper half of the cylindrical shell has an open observation area along its axial direction. The insulator is fixed to the bottom of the cylindrical shell, and the cylindrical guide rod is coaxially fixed to the insulator and extends along the shell's axis, with its top end passing through the transparent cover plate made of insulating material. The metal particle placement platform is an arc-shaped strip structure whose curvature matches the inner wall curvature of the cylindrical shell and is fixed to the inner wall of the shell to support the metal particles to be observed. The imaging module includes a high-speed camera positioned in front of the observation window, used to capture metal particles within the open observation area.

[0005] Furthermore, the top of the cylindrical shell is provided with an opening, and the transparent cover plate covers the opening; the upper part of the cylindrical shell is provided with a partially open structure along the circumference, while retaining the half-side cylindrical wall structure in the circumference; the transparent cover plate and the half-side cylindrical wall structure enclose the open observation area.

[0006] Furthermore, both the insulator and the transparent cover plate are provided with through holes coaxial with the cylindrical shell, and the radius of the through holes is the same as the radius of the cylindrical guide rod.

[0007] Furthermore, the metal particle placement stage is welded to the inner wall of the cylindrical shell and located on the opposite side of the open observation area.

[0008] Furthermore, the bottom of the cylindrical shell is provided with a grounding hole for connecting a grounding wire; the top of the cylindrical guide rod is provided with a wiring hole for connecting a high-voltage wire.

[0009] Furthermore, a vertical shaft placement platform is provided at the bottom of the cylindrical shell, which is used to keep the cylindrical guide rod and the bottom surface of the pressure air chamber insulated and isolated.

[0010] Furthermore, both the cylindrical shell and the metal particle placement stage are made of aluminum alloy, wherein the length of the metal particle placement stage is 1 / 6 to 1 / 3 of the circumference of the cylindrical shell.

[0011] A method for observing the motion of metallic particles inside a vertical GIL (Gas Injectory System), the method being applied to any of the aforementioned vertical GIL observation devices, the method comprising the following steps: S1: Open the pressure chamber, vertically place the assembled shaft model module into the pressure chamber, connect the grounding wire through the grounding hole, and connect the high-voltage wire through the wiring hole; S2: Evenly place the metal particles to be observed on the metal particle placement stage, rotate the metal particle placement stage to the opposite side of the observation window, and close the pressure gas chamber; S3: After the pressure chamber is evacuated to a vacuum through the vacuum valve, insulating gas at a set pressure is introduced through the inflation valve. S4: Set up the high-speed camera in front of the observation window. The height of the high-speed camera is higher than the height of the cylindrical shell. Tilt the high-speed camera downwards at 45°-70° toward the open observation area. Start the observation PC and the high-speed camera. S5: Connect the DC high voltage power supply and gradually increase the voltage to the set value. After observing the metal particles starting to move, record the data using a high-speed camera. S6: After the experiment is completed, first turn off the DC high voltage power supply. After the equipment has discharged completely, turn off the high-speed camera and the observation PC, and collect the captured data for analysis.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention employs a cylindrical shell design with an open top and a semi-circular wall structure retained along the axial direction in the upper half. Combined with a transparent cover plate mounted on the top, this creates an observation area that integrates openness and transparent coverage. This structure completely solves the problem of blind spots in traditional fully enclosed or limited-window devices.

[0013] The transparent cover only covers the top area and does not cover the half-side cylinder wall structure that is retained along the axial direction, thus avoiding the impact of reduced light transmittance at the corners of the shell on clear observation of phenomena such as the adhesion and collision of metal particles on the surface of the insulator.

[0014] This design enables observation equipment such as high-speed cameras to continuously capture the three-dimensional motion trajectory of metal particles inside the simulated shaft from multiple angles and all directions, realizing a visual record of the entire process of particles from initiation, migration, collision to suspension, greatly improving the completeness and accuracy of the observation.

[0015] 2. By placing the cylindrical shell vertically and combining it with an arc-shaped metal particle placement platform that perfectly matches the curvature of the shaft's inner wall, this model highly replicates the geometry and inner wall morphology of a real GIL shaft.

[0016] The arc-shaped placement stage makes the initial attachment state, charging process, start-up conditions, and collision and rebound behavior of metal particles closer to the actual engineering environment, effectively avoiding the motion trajectory distortion problem caused by traditional planar placement stages.

[0017] This design significantly improves the reliability and physical authenticity of experimental data, providing a highly reliable experimental platform for studying the interaction between particles and insulators and shells in shafts, and helping to deepen the understanding of the mechanism of particle motion in shaft environments. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the metal particle motion observation device inside the vertical shaft GIL of the present invention; Figure 2 This is a schematic diagram of the overall structure of the vertical shaft model module of the present invention; Figure 3 This is a schematic diagram of the transparent cover plate and insulator of the present invention; Figure 4 This is a schematic diagram of the cylindrical shell and the metal particle placement stage of the present invention; Figure 5 This is a schematic diagram of the experimental environment module of the present invention; Figure 6 This is a schematic diagram of the imaging module of the present invention; Figure 7 This is a schematic flowchart of the method for observing the movement of metal particles inside a vertical shaft GIL according to the present invention.

[0019] In the diagram: 1. Experimental environment module; 11. Pressure chamber; 12. Observation window; 13. Inflation valve; 14. Evacuation valve; 2. Shaft model module; 21. Cylindrical shell; 211. Open observation area; 2111. Open structure; 2112. Half-side cylinder wall structure; 212. Grounding hole; 213. Grounding wire; 22. Transparent cover plate; 221. Through hole; 23. Insulator; 24. Cylindrical guide rod; 241. Wiring hole; 242. High voltage line; 25. Metal particle placement platform; 26. Shaft placement platform; 3. Imaging module; 31. High-speed camera; 32. Observation PC. Detailed Implementation

[0020] 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.

[0021] The technical solution of the present invention will be described in detail below with reference to specific embodiments. The following specific embodiments may be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0022] like Figures 1 to 6As shown, this invention provides a device for observing the motion of metal particles inside a vertical shaft GIL (Gas Injection Line), mainly comprising a shaft model module 2, an experimental environment module 1, and an imaging module 3. The shaft model module 2, as the core simulation unit, is placed inside the experimental environment module 1, and the imaging module 3 enables the visual recording of the metal particle motion process. This design integrates simulation, environmental control, and observation functions into a complete experimental platform.

[0023] Specifically, the shaft model module 2 includes a cylindrical shell 21, a transparent cover plate 22, an insulator 23, a cylindrical guide rod 24, and a metal particle placement platform 25.

[0024] The cylindrical shell 21 is made of aluminum alloy with a surface roughness of less than 6.3μm to ensure the consistency of the conductivity and surface condition of the inner wall. Its inner radius is designed to be 6-15cm (10cm in this invention), and its height is 20-50cm (30cm in this invention), placed vertically to simulate a real shaft structure. The upper half of the shell retains a half-side cylindrical wall structure 2112 along the axial direction, forming an open observation area 211; a grounding hole 212 with a radius of 0.5cm is opened approximately 1cm above the bottom for reliable connection of the grounding wire 213. The top of the shell is an open structure 2111, covered by a transparent cover plate 22. The transparent cover plate 22 is made of acrylic material with a thickness of 3-5mm (e.g., 4mm), providing good light transmittance and mechanical strength. A through hole 221 with the same radius as the cylindrical guide rod 24 is opened in its middle. The inner diameter of the through hole 221 is interference-fitted with the outer diameter of the cylindrical guide rod 24 to ensure tight assembly and maintain cavity sealing. The transparent cover plate 22 is fitted to the top of the cylindrical shell 21, forming an open observation area 211 together with the half-side wall of the cylindrical shell 21. This allows the upper part of the cylindrical shell 21 to be directly observed from the outside. At the same time, the transparent cover plate 22 only covers the top area parallel to the outside, without extending or bending to cover the half-side wall structure 2112 retained along the axial direction. This avoids the reduced light transmittance at the corners formed by extension and bending, which would affect the clear observation of phenomena such as the adhesion and collision of metal particles on the surface of the insulator 23. This solves the problem of limited field of view and blind spots caused by fully enclosed models or small-sized observation windows 12. It enables the high-speed camera 31 to capture the three-dimensional movement of particles in the vertical shaft simulation space from the outside without obstruction and continuously. This achieves complete and clear visualization of the entire process of movement, including initiation, migration, collision, and suspension, greatly improving the comprehensiveness and accuracy of the observation data.

[0025] The cylindrical shell 21 is designed with an open top and a half-side wall retained in the upper part, which is combined with a transparent cover plate 22. This creates a unique open observation area 211 that combines a transparent and sealed top with an axially open side. This allows the high-speed camera to observe the positions from the metal particle placement stage 25 to the surface of the insulator 23 through the observation window 12, resulting in a large observation range.

[0026] like Figure 2 and Figure 3 As shown, insulator 23 is fixed to the inner bottom of cylindrical shell 21. Cylindrical guide rod 24 extends along the axis of cylindrical shell 21 and passes sequentially through transparent cover plate 22 and insulator 23. Both insulator 23 and transparent cover plate 22 have through holes 221 coaxial with cylindrical shell 21. The radius of through holes 221 is the same as the radius of cylindrical guide rod 24 to achieve coaxial positioning and insulating support of cylindrical guide rod 24. A wiring hole 241 is provided at the top of cylindrical guide rod 24 for connecting high-voltage line 242. Cylindrical guide rod 24 is made of aluminum alloy, and the ratio of its outer diameter to the inner diameter of cylindrical shell 21 is optimized (usually not exceeding 0.476) to simulate the real electric field distribution. Precise coaxial positioning and fixation of the cylindrical guide rod 24 at both ends by insulator 23 and transparent cover plate 22 ensures strict coaxiality between the high-voltage electrode and the grounding shell. By combining an optimized conductor-shell diameter ratio, this design effectively suppresses the distortion of the experimental electric field caused by structural asymmetry, thus highly restoring the coaxial cylindrical electric field characteristics of a real DC GIL shaft in a scaled-down model. This provides a key guarantee for studying the force and motion laws of metal particles under real and stable electric fields.

[0027] like Figure 2 As shown, the metal particle placement stage 25 is an arc-shaped strip structure, the curvature of which matches the curvature of the inner wall of the cylindrical shell 21. This stage is fixed to the inner wall of the cylindrical shell 21 and located on the opposite side of the open observation area 211, used to support the metal particles to be observed. The metal particle placement stage 25 is made of aluminum alloy, and its length can be 1 / 6 to 1 / 3 of the circumference of the cylindrical shell 21 according to the experimental design. The use of an arc-shaped metal particle placement stage 25 with a curvature completely consistent with the inner wall of the shaft is a core innovation that enhances the physical realism of the experimental simulation. It accurately reproduces the initial attachment state and substrate geometry of the particles on the arc-shaped inner wall of the actual GIL pipeline, making the particle charging process, the initiation threshold in the composite field, and the contact mechanics and rebound trajectory when colliding with the curved inner wall more closely resemble engineering reality. This effectively overcomes the distortion of particle force and motion behavior caused by traditional planar placement stages, significantly improving the guiding value and reliability of experimental data for actual GIL insulation design and particle suppression strategy formulation.

[0028] like Figure 1 , Figure 2 and Figure 3As shown, the shaft placement platform 26 is located at the bottom of the cylindrical shell 21 and is made of epoxy resin or acrylic insulating material. It supports the entire shaft model module 2, and its core function is to prevent direct contact between the cylindrical guide rod 24 and the bottom (ground potential) of the experimental environment chamber. As an insulating base, the shaft placement platform 26 reliably isolates the entire model module containing the high-voltage conductor from the ground potential, completely eliminating the potential risk of high-voltage conductor discharge to ground and ensuring the safety of the high-voltage experiment. Simultaneously, it provides stable horizontal support for the model, ensuring the stability of the shaft model's posture during the experiment and avoiding unexpected variables introduced by model tilting or swaying, thereby ensuring the consistency of experimental conditions and the repeatability of experimental results.

[0029] like Figure 1 and Figure 5 The experimental environment module 1 has a sealed pressure chamber 11 with an observation window 12 for observing the interior of the chamber. The chamber is equipped with an inflation valve and an evacuation valve to regulate the gas environment within the chamber. The evacuation valve can be used to evacuate the pressure chamber 11 to a vacuum, and then the inflation valve can be used to fill it with SF6 insulating gas at a set pressure to simulate the operating environment of a real GIL. The imaging module 3 includes a high-speed camera 31 mounted in front of the observation window 12 to capture the movement of metal particles within the open observation area 211. The high-speed camera 31 is typically mounted at a height higher than the model and tilted downwards at an angle of 45°-70° to obtain the optimal field of view, and is connected to the observation PC 32 for image recording and analysis. The sealed pressure chamber 11 allows for independent and precise control of the type and pressure of the insulating gas, enabling flexible simulation of GIL operating conditions under different pressures and gas media, thus expanding the research dimensions of the experiment. The high-speed camera 31, combined with a specific angle mounting scheme, fully utilizes the field-of-view advantage of the open observation area 211, enabling it to capture the microscopic motion details of particles with high spatiotemporal resolution. The entire system integrates environmental simulation, high-pressure application, motion image capture, storage, and analysis, realizing the integration of the experimental process and the automation of observation, providing strong technical support for the efficient, accurate, and batch acquisition of effective experimental data.

[0030] like Figure 7 As shown, the observation method based on the above-mentioned device is implemented in the following steps: S1: Model insertion and electrical connection. Open the pressure chamber 11 of the experimental environment module 1 and vertically place the assembled shaft model module 2 into the pressure chamber 11. Connect the grounding wire 213 through the grounding hole 212 at the bottom of the cylindrical shell 21 to achieve reliable grounding of the model shell; connect the high-voltage line 242 through the wiring hole 241 at the top of the cylindrical guide rod 24 to prepare for the application of high voltage. The purpose of this step is to place the core module simulating the shaft structure in a controllable airtight environment and establish a wiring circuit that conforms to the electrical conditions of real GIL operation. The shell grounding simulates the actual GIL shell grounding state, and the conductor is connected to the high voltage to simulate the high potential of the center conductor. This operation ensures that the electrical basis of the experiment is consistent with the real operating conditions, which is a prerequisite for generating the required electric field later.

[0031] S2: Particle Placement and Environmental Sealing. The metal particles to be observed (such as copper or aluminum particles) are evenly placed on the metal particle placement stage 25, and the stage 25 is rotated to the opposite side of the observation window 12. Subsequently, the pressure chamber 11 is closed and its seal is ensured. The purpose of this step is twofold: first, placing the metal particles on an arc-shaped platform with a curvature consistent with the actual inner wall simulates the initial attachment position and state of the particles in the actual equipment, providing a realistic starting point for studying their startup behavior; second, placing the stage opposite the observation window 12 allows the camera to fully capture the movement of the particles from startup to entering the open observation area 211, while avoiding obstruction of the observation line by the stage itself, ensuring maximum field of view. The sealed chamber provides the necessary conditions for creating a pure and controllable gas environment in the next step.

[0032] S3: Vacuum treatment and insulating gas filling. The pressure chamber 11 is evacuated to a vacuum state via the evacuation valve, and then insulating gas at a set pressure is filled in via the filling valve. The core purpose of this step is to accurately simulate the insulating medium environment inside the GIL device. Vacuuming completely eliminates the interference of air and impurities on the insulating gas performance and electric field distribution; filling with insulating gas at a specific pressure realistically replicates the insulation conditions during device operation. Gas pressure is a key parameter affecting the resistance, buoyancy, and insulation strength of the particles; this step enables the controllable adjustment and study of this parameter.

[0033] S4: Observation System Setup and Debugging. The high-speed camera 31 is mounted in front of the observation window 12 of the experimental environment chamber. The camera's position is adjusted so that its mounting height is higher than the top of the shaft model module 2, and it is tilted downwards at an angle of 45 to 70 degrees, aligning with the open observation area 211 of the model. The high-speed camera 31 and observation PC 32 are started, and parameters such as focal length, aperture, and frame rate are precisely adjusted. The purpose of this step is to establish an optimal optical observation system capable of capturing the three-dimensional motion details of particles. The specific pitch angle, combined with the field of view design of the open observation area 211, allows the camera's line of sight to cover the particle motion path from the metal particle placement platform 25, to the surface of the insulator 23, and up to the vast space of the upper half of the cylindrical shell 21 without obstruction. This setup effectively avoids blind spots, ensuring continuous and complete recording of the entire process of particle movement, including leaping, migration, collision, and suspension, from the optimal perspective, obtaining high-quality, complete image sequence data for subsequent trajectory analysis.

[0034] S5: High Voltage Application and Movement Recording. Connect the DC high-voltage power supply and gradually increase the voltage applied to the cylindrical conductor 24 at a uniform and slow rate. Monitor the screen through the observation window 12 or the camera. When the metal particles begin to detach from the placement platform and begin to move, maintain the voltage at that value or continue to increase it to the preset stable experimental voltage, and simultaneously start the high-speed camera 31 for continuous recording. This step is crucial for exciting and completely recording the dynamic behavior of the particles under the action of the electric field. The gradual voltage increase method can be used to accurately determine the initial movement voltage (i.e., the starting field strength) of different particles, which is a key parameter for evaluating the insulation system's tolerance to particulate contamination. Recording the subsequent movement of the particles under a stable voltage allows for a systematic study of their motion patterns, average velocity, spatial distribution, collision frequency with the shell and insulator 23, and steady-state behavior such as suspension characteristics, thereby obtaining a stable, reproducible, and quantitatively analytical dataset of motion characteristics.

[0035] S6: Experimental Conclusion and Data Analysis. After the experiment, the DC high-voltage power supply was first systematically shut down, and sufficient time was allowed to ensure the experimental system was fully discharged. Then, the high-speed camera 31 and observation PC 32 were turned off. Finally, all captured high-speed video data was exported and stored, and professional image processing and motion analysis software was used to process the data. This step aims to safely and systematically conclude the experiment and scientifically extract research conclusions from the raw data. Strict power-off and discharge procedures ensured operational safety. By performing frame-by-frame analysis or trajectory tracking algorithms on the high-speed video data, quantitative parameters such as the motion trajectory coordinates, instantaneous velocity and acceleration, maximum motion height, and number and location of collision events for each particle can be accurately extracted. Based on this data, the complex motion mechanism of metal particles in the special geometry, electric field, and gas environment of the vertical shaft GIL can be deeply revealed, providing direct and reliable experimental evidence and data support for the optimization of the insulation structure design of GIL products, the formulation of particle suppression strategies, and the assessment of operational reliability.

[0036] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for observing the movement of metal particles inside a vertical shaft GIL, characterized in that, It includes an experimental environment module, a shaft model module, and a shooting module; The experimental environment module has a sealed pressure chamber and an observation window that allows observation inside the pressure chamber, and is equipped with inflation and deflation valves. The vertical shaft model module is set inside the pressure chamber and includes a cylindrical shell, a transparent cover plate, an insulator, a cylindrical guide rod, and a metal particle placement platform. The cylindrical shell, acting as a conductor, is vertically positioned within the pressure chamber, and the upper half of the cylindrical shell has an open observation area along its axial direction. The insulator is fixed to the bottom of the cylindrical shell, and the cylindrical guide rod is coaxially fixed to the insulator and extends along the shell's axis, with its top end passing through the transparent cover plate made of insulating material. The metal particle placement platform is an arc-shaped strip structure whose curvature matches the inner wall curvature of the cylindrical shell and is fixed to the inner wall of the shell to support the metal particles to be observed. The imaging module includes a high-speed camera positioned in front of the observation window, used to capture metal particles within the open observation area.

2. The device for observing the movement of metal particles inside a vertical shaft GIL according to claim 1, characterized in that, The top of the cylindrical shell is open, and the transparent cover plate covers the open; the upper part of the cylindrical shell is partially open along the circumference, while retaining the half-side cylindrical wall structure in the circumference; the transparent cover plate and the half-side cylindrical wall structure enclose the open observation area.

3. The device for observing the movement of metal particles inside a vertical shaft GIL according to claim 1, characterized in that, Both the insulator and the transparent cover plate are provided with through holes coaxial with the cylindrical shell, and the radius of the through holes is the same as the radius of the cylindrical guide rod.

4. The device for observing the movement of metal particles inside a vertical shaft GIL according to claim 1, characterized in that, The metal particle placement stage is welded to the inner wall of the cylindrical shell and is located on the opposite side of the open observation area.

5. The device for observing the movement of metal particles inside a vertical shaft GIL according to claim 1, characterized in that, The bottom of the cylindrical shell is provided with a grounding hole for connecting a grounding wire; the top of the cylindrical guide rod is provided with a wiring hole for connecting a high-voltage wire.

6. The device for observing the movement of metal particles inside a vertical shaft GIL according to claim 1, characterized in that, The bottom of the cylindrical shell is provided with a vertical shaft placement platform, which is used to keep the cylindrical guide rod and the bottom surface of the pressure air chamber insulated.

7. The device for observing the movement of metal particles inside a vertical shaft GIL according to claim 1, characterized in that, Both the cylindrical shell and the metal particle placement stage are made of aluminum alloy, wherein the length of the metal particle placement stage is 1 / 6 to 1 / 3 of the circumference of the cylindrical shell.

8. A method for observing the motion of metal particles inside a vertical shaft GIL, characterized in that, The method of using the metal particle motion observation device inside the vertical shaft GIL as described in any one of claims 1-7 includes the following steps: S1: Open the pressure chamber, vertically place the assembled shaft model module into the pressure chamber, connect the grounding wire through the grounding hole, and connect the high-voltage wire through the wiring hole; S2: Evenly place the metal particles to be observed on the metal particle placement stage, rotate the metal particle placement stage to the opposite side of the observation window, and close the pressure gas chamber; S3: After the pressure chamber is evacuated to a vacuum through the vacuum valve, insulating gas at a set pressure is introduced through the inflation valve. S4: Set up the high-speed camera in front of the observation window. The height of the high-speed camera is higher than the height of the cylindrical shell. Tilt the high-speed camera downwards at 45°-70° toward the open observation area. Start the observation PC and the high-speed camera. S5: Connect the DC high voltage power supply and gradually increase the voltage to the set value. After observing the metal particles starting to move, record the data using a high-speed camera. S6: After the experiment is completed, first turn off the DC high voltage power supply. After the equipment has discharged completely, turn off the high-speed camera and the observation PC, and collect the captured data for analysis.

9. The method for observing the movement of metal particles inside a vertical shaft GIL according to claim 8, wherein the insulating gas is sulfur hexafluoride.

10. The method for observing the movement of metal particles inside a vertical shaft GIL according to claim 8, wherein the step of applying a DC high voltage adopts a step-by-step voltage increase method, and the voltage is kept stable for recording after the particles begin to move.

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