Detection method and system of GIS internal metal powder detection device

Abstract

This application relates to the field of metal foreign object detection technology, and particularly to a detection method and system for a metal powder detection device inside a GIS (Gas Insulator). The method includes: filling a cavity of the GIS device with a preset gas under preset light-shielding conditions and applying a preset voltage to the cavity; detecting the number of photon signals in a stable state within the cavity after a preset time; applying voltage to the cavity according to a preset voltage boosting strategy, and detecting the current number of photon signals within the cavity using a photon counting probe and a photon counting unit; if the current number of photon signals is greater than the number of photon signals in a stable state, it is determined that there are metal powder particles in motion within the cavity. This solves the problems of most conventional methods for measuring metal powder through partial discharge being greatly affected by environmental noise and having difficulty detecting metal powder particles in motion. It can detect and analyze weak light signals caused by metal powder particles and has advantages such as strong anti-electromagnetic interference, strong insulation, and high sensitivity.

Description

Technical Field

[0001] This application relates to the field of metal foreign object detection technology, and in particular to a detection method and system for a metal micro powder detection device inside a GIS. Background Technology

[0002] Gas-insulated switchgear (GIS) has been widely used in power systems due to its advantages such as small footprint, environmental friendliness, and high safety, and is a key piece of equipment in modern power transmission and distribution networks. Studies have found that among various fault types in GIS equipment, discharge faults caused by metal powder and foreign objects account for as much as 20%.

[0003] Micro- and nano-sized metal powders are the most common contaminants inside GIS cavities. These powders may come from friction during installation, expansion and contraction of high-voltage conductors during operation, and wear during switch opening and closing. These micro- and nano-sized powders are prone to depositing on insulation, connectors, and contact points, leading to electric field concentration, decreased insulation withstand voltage, and increased risk of partial discharge and flashover.

[0004] Existing detection methods, such as pulsed current method, ultra-high frequency method, and ultrasonic method, mostly indirectly detect metal powder by detecting the current, electromagnetic waves, and ultrasonic waves induced by partial discharge caused by metal foreign objects. Most conventional partial discharge measurement methods can detect metal powder that causes strong partial discharge or even insulation flashover, but they are greatly affected by environmental noise and have difficulty detecting metal powder in motion. Summary of the Invention

[0005] This application provides a detection method and system for a metal powder detection device inside a GIS, to solve the problems that most conventional methods for measuring metal powder by partial discharge are greatly affected by environmental noise and have difficulty detecting metal powder in motion.

[0006] The first aspect of this application provides a detection method for a metal powder detection device inside a GIS (Gas Insulated Switchgear) system. The metal powder detection device includes a gas-insulated switchgear (GIS) unit, a photonic module fixture, a photonic counting probe, and a photonic counting unit. The GIS unit has an observation window, and the photonic module fixture is connected to the observation window. The observation window is used to transmit photon signals emitted by the metal powder. The photonic module fixture is designed with a light-shielding structure. The photonic counting probe is located inside the photonic module fixture and is used to receive photon signals. The photonic counting unit is connected to the photonic counting probe and is used to count the photon signals. The method includes the following steps: filling the cavity of the GIS device with a preset gas under preset light-shielding conditions and applying a preset voltage to the cavity; detecting the number of photon signals in a stable state in the cavity after a preset time; applying voltage to the cavity according to a preset voltage boosting strategy and detecting the current number of photon signals in the cavity using the photon counting probe and the photon counting unit; determining whether the current number of photon signals is greater than the number of photon signals in a stable state; if the current number of photon signals is greater than the number of photon signals in a stable state, then determining that there are metal micropowders in motion in the cavity.

[0007] Optionally, after determining whether the number of current photon signals is greater than the number of photon signals in a stable state, the method further includes: if the number of current photon signals is less than or equal to the number of photon signals in a stable state, then it is determined that there are no moving metal microparticles in the cavity.

[0008] Optionally, the light-shielding structure is a soft, opaque light-shielding layer.

[0009] Optionally, the observation window is made of quartz glass.

[0010] Optionally, the preset shading condition is a background value of less than 80 photons per second.

[0011] A second aspect of this application provides a detection system for a metal powder detection device inside a GIS (Gas Insulated Switchgear). The metal powder detection device includes a GIS device, a photonic module fixture, a photon counting probe, and a photon counting unit. The GIS device has an observation window, and the photonic module fixture is connected to the observation window. The observation window is used to transmit photon signals emitted by the metal powder. The photonic module fixture is designed with a light-shielding structure. The photon counting probe is located inside the photonic module fixture and is used to receive photon signals. The photon counting unit is connected to the photon counting probe and is used to count... The method for counting the number of photon signals includes: a first detection module, used to fill the cavity of the GIS device with a preset gas under preset light-shielding conditions and apply a preset voltage to the cavity, and detect the number of photon signals in a stable state in the cavity after a preset time; a second detection module, used to apply voltage to the cavity according to a preset voltage boosting strategy and use the photon counting probe and the photon counting unit to detect the current number of photon signals in the cavity; and a judgment module, used to determine that there are moving metal micropowders in the cavity if the current number of photon signals is greater than the number of photon signals in a stable state.

[0012] Optionally, after determining whether the number of current photon signals is greater than the number of photon signals in a stable state, the determining module is further configured to: if the number of current photon signals is less than or equal to the number of photon signals in a stable state, then determine that there are no moving metal micropowders in the cavity.

[0013] Optionally, the light-shielding structure is a soft, opaque light-shielding layer.

[0014] Optionally, the observation window is made of quartz glass.

[0015] Optionally, the preset shading condition is a background value of less than 80 photons per second.

[0016] In the above embodiment, a preset gas is filled into the cavity of the GIS device under preset light-shielding conditions, and a preset voltage is applied to the cavity. After a preset time, the number of photon signals in a stable state within the cavity is detected. A preset voltage boosting strategy is then applied to the cavity, and the current number of photon signals within the cavity is detected using a photon counting probe and a photon counting unit. If the current number of photon signals is greater than the number of photon signals in a stable state, it is determined that there are moving metal particles within the cavity. This solves the problems of most conventional methods for measuring metal particles through partial discharge being greatly affected by environmental noise and having difficulty detecting moving metal particles. It can detect and analyze weak light signals induced by metal particles and has advantages such as strong anti-electromagnetic interference, strong insulation, and high sensitivity.

[0017] 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

[0018] 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:

[0019] Figure 1 This is a flowchart of a detection method for a GIS internal metal powder detection device according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the structure of a GIS internal metal powder detection device according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the construction of a metal micropowder photonic measurement test platform according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram showing the photon measurement results of copper powder under different voltage conditions according to an embodiment of this application;

[0023] Figure 5 This is an example diagram of a detection system for a GIS internal metal powder detection device according to an embodiment of this application. Attached image description:

[0025] 10 - Detection system of GIS internal metal micro powder detection device; 100 - First detection module; 200 - Second detection module; 300 - Judgment module. Detailed Implementation

[0026] 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.

[0027] The detection method and system of the GIS internal metal powder detection device according to embodiments of this application are described below with reference to the accompanying drawings. Addressing the problems mentioned in the background art regarding the significant impact of environmental noise on most conventional partial discharge methods for measuring metal powder and the difficulty in detecting moving metal powder, this application provides a detection method for a GIS internal metal powder detection device. In this method, a preset gas is introduced into the cavity of the GIS device under preset light-shielding conditions, and a preset voltage is applied to the cavity. After a preset time, the number of photon signals in a stable state within the cavity is detected. A voltage is applied to the cavity according to a preset voltage boosting strategy, and the current number of photon signals within the cavity is detected using a photon counting probe and a photon counting unit. If the current number of photon signals is greater than the number of photon signals in a stable state, it is determined that moving metal powder exists within the cavity. This solves the problems of significant impact of environmental noise on most conventional partial discharge methods for measuring metal powder and the difficulty in detecting moving metal powder. It can detect and analyze weak light signals caused by metal powder and has advantages such as strong anti-electromagnetic interference, strong insulation, and high sensitivity.

[0028] Since metal powder is ubiquitous in the GIS cavity, on the one hand, when the metal powder is stationary, the electric field distortion at the metal tip is severe, which will cause gas ionization and release photons; on the other hand, the metal powder will inevitably be affected by the electric field under GIS operating conditions and move. When the powder collides with each other and with the electrode plate during the movement, intense charge exchange occurs and a large number of photons are emitted.

[0029] Photon measurement technology is based on the photoelectric effect to collect and count individual photons. Single-photon detection is an ultra-low noise detection technology. Its enhanced sensitivity enables it to detect the smallest energy unit of light—the photon. Based on the single-photon detector, individual photons can be detected and counted, enabling the detection of extremely weak target signals.

[0030] Therefore, this application proposes a method for detecting weak light signals generated when metal microparticles move using photon measurement technology, which can effectively detect metal microparticles inside GIS.

[0031] Specifically, Figure 1 This is a schematic flowchart illustrating a detection method for a GIS internal metal micropowder detection device provided in an embodiment of this application.

[0032] like Figure 1 As shown, the detection method of the metal powder detection device inside the GIS includes the following steps:

[0033] The metal powder detection device includes a gas-insulated switchgear (GIS) device, a photonic module fixture, a photonic counting probe, and a photonic counting unit. The GIS device has an observation window, which is connected to the photonic module fixture. The observation window is used to transmit photonic signals emitted by the metal powder. The photonic module fixture is designed with a light-shielding structure. The photonic counting probe is located inside the photonic module fixture and is used to receive photonic signals. The photonic counting unit is connected to the photonic counting probe and is used to count the number of photonic signals.

[0034] In step S101, a preset gas is filled into the cavity of the GIS device under preset light-shielding conditions, and a preset voltage is applied to the cavity. After a preset time, the number of photon signals in the cavity under stable conditions is detected.

[0035] Among them, the preset gas, preset voltage, and preset time can be thresholds preset by the user, thresholds obtained through a limited number of experiments, or thresholds obtained through a limited number of computer simulations.

[0036] In step S102, a voltage is applied to the cavity according to a preset boost strategy, and the number of current photon signals in the cavity is detected using a photon counting probe and a photon counting unit.

[0037] It should be noted that, in the embodiments of this application, the preset boosting strategy can be step boosting or constant speed boosting.

[0038] In step S103, it is determined whether the number of current photon signals is greater than the number of photon signals in a stable state. If the number of current photon signals is greater than the number of photon signals in a stable state, it is determined that there are metal micropowders in motion inside the cavity.

[0039] Optionally, in some embodiments, after determining whether the number of current photon signals is greater than the number of photon signals in a stable state, the method further includes: if the number of current photon signals is less than or equal to the number of photon signals in a stable state, then it is determined that there are no moving metal microparticles in the cavity.

[0040] Optionally, in some embodiments, the light-shielding structure is a soft, opaque light-shielding layer.

[0041] Optionally, in some embodiments, the viewing window is made of quartz glass.

[0042] Optionally, in some embodiments, the preset shading condition is a background value of less than 80 photons per second.

[0043] Specifically, the metal micro-powder detection device consists of a terminal, a photon counting unit, a photon counting probe, and a photon module tooling, such as... Figure 2As shown. The photon module is the core device, enabling single-photon level optical measurements within the GIS. The photon module fixture serves as the container for the photon counting probe, achieving a tight connection with the GIS equipment's observation window. Due to the high sensitivity of the photon counting module, special attention must be paid to light shielding during use. Light-shielding cloth or soft, opaque materials should be used as a shielding layer to prevent external light pollution from interfering with the measurement and ensure adequate light shielding. To ensure ultraviolet transmittance, the GIS equipment's observation window should be made of quartz glass with sufficient structural strength, rather than conventional acrylic glass, with a transmittance band that essentially covers the visible, near-ultraviolet, and far-ultraviolet light bands.

[0044] In implementing this embodiment, under the premise of ensuring that the light-shielding performance meets the requirements (i.e., the background value is less than 80 photons per second), a section of the GIS cavity is thoroughly cleaned to ensure that there are no metal microparticles inside. A preset gas (e.g., high-pressure SF6 gas) is filled into the cavity of the GIS equipment, and a preset voltage is applied to the cavity. After about 1 hour, the number of photon signals in the cavity under a stable state is detected using a photon counting probe and a photon counting unit. The stable photon count level is used as the reference value for the absence of metal microparticles.

[0045] Furthermore, the number of photon signals in a stable state is compared with the current number of photon signals in the GIS chamber under test in real time. If the current number of photon signals is greater than the number of photon signals in a stable state, it is determined that there are moving metal microparticles in the chamber. If the current number of photon signals is less than or equal to the number of photon signals in a stable state, it is determined that there are no moving metal microparticles in the chamber.

[0046] In this application, the technical effects of the embodiments are also explored through a flat plate electrode experiment.

[0047] Specifically, the size of the metal powder in GIS equipment is much smaller than the equipment structure. Therefore, for a metal powder located at a certain position in the GIS chamber, its size is small enough that it is essentially in a relatively stable electric field at that moment. The electric field strength between the parallel plates is extremely uniform, sufficient to satisfy the field strength at the location of the particle. Furthermore, by changing the plate spacing and applying voltage, the electric field strength at various locations inside the GIS equipment can be simulated. Therefore, the technical effects of the above invention can be explored through flat plate electrode experiments.

[0048] Building such Figure 3The experimental platform shown consists of a computer, a photon counting probe, a photon counting unit, an experimental chamber, planar electrodes, an excitation power supply, and a light-shielding environment. The excitation power supply provides an initial DC / AC voltage excitation in volts (V), which is amplified to the kV level by a partial discharge-free transformer before being connected to the measuring electrodes. Metal powder is placed between the planar electrodes. An observation window is opened on the experimental chamber of the planar electrodes, with the photon counting probe positioned horizontally in front of the window for better observation of the metal powder's luminescence. A photon counting card is connected to the photon counting probe to analyze the number of light pulses output by the probe within a given integration time period. The photon counting card is then connected to the computer via USB to output photon counting information.

[0049] The metal powder used in the experiment was copper powder with a particle size ranging from 10 to 100 micrometers. During the experiment, the metal powder was thoroughly cleaned in an anhydrous ethanol ultrasonic cleaner and completely dried. 0.1 g of the metal powder was then weighed and evenly placed in a 1 cm area at the center of the ground electrode plate. After evacuating the experimental chamber, an SF6 recovery device, along with appropriate gas cylinders, was used to achieve an internal pressure of 0.3 MPa. During the experiment, the AC voltage was increased in stages, and the DC voltage was increased at a constant rate. Each measurement consisted of two parts: the first part measured the background photon count without the metal powder; the second part was the formal experiment, measuring the photon count with the metal powder. The results of the two parts were compared, and combined with the initiation voltage of the metal powder's movement, to comprehensively determine the degree of luminescence induced by the movement of the metal powder.

[0050] Verification test results as follows Figure 4 As shown, the stepped voltage range under AC voltage was set to 5–14 kV. When the applied voltage was below 11 kV, the number of photons experienced a brief surge upon pressure application, followed by a decrease and return to the level seen in the particle-free state. This corresponds to the powder bouncing upon pressure application, followed by a weakening of the movement of the microparticles (a significant portion of the moving microparticles moved outside the electrode area). With increasing applied voltage, at 11 kV and above, the photon count significantly increased compared to the particle-free state. This corresponds to the violent "dust storm"-like movement of the powder after pressure application. Collisions between metal particles and between particles and the electrode plates trigger micro-discharges, releasing a large number of photons, thus manifesting as a significant increase in the photon count. Figure 4 As shown in (a).

[0051] Under DC voltage, when the applied voltage is below approximately 8kV, the presence or absence of metal powder does not significantly affect the photon count; the two values ​​are essentially equal. However, as the voltage continues to increase, the photon count with powder shows a significant increase compared to the state without powder. Under the influence of metal powder, the photon count increases with voltage to varying degrees, and two peak values ​​appear at approximately 13kV and 16kV, namely 1007 at 42s and 1564 at 52s, respectively. Figure 4 As shown in (b).

[0052] Therefore, it can be seen that the photon measurement curves of copper powder under different voltage conditions are significantly different from the background values ​​in the particle-free state, indicating that the motion of metal micropowder can be effectively detected by photon measurement technology.

[0053] According to the detection method of the GIS internal metal powder detection device proposed in the embodiments of this application, a preset gas is filled into the cavity of the GIS device under preset light-shielding conditions, and a preset voltage is applied to the cavity. After a preset time, the number of photon signals in the cavity under a stable state is detected. A voltage is applied to the cavity according to a preset voltage boosting strategy, and the number of current photon signals in the cavity is detected using a photon counting probe and a photon counting unit. If the number of current photon signals is greater than the number of photon signals in the stable state, it is determined that there are metal powders in motion in the cavity. This solves the problems of most conventional methods for measuring metal powder through partial discharge being greatly affected by environmental noise and having difficulty detecting metal powders in motion. It can detect and analyze weak light signals caused by metal powders and has advantages such as strong anti-electromagnetic interference, strong insulation, and high sensitivity.

[0054] Next, referring to the accompanying drawings, the detection system of the GIS internal metal micro powder detection device proposed according to the embodiments of this application is described.

[0055] Figure 5 This is a block diagram of the detection system of the GIS internal metal micro powder detection device according to an embodiment of this application.

[0056] The metal powder detection device includes a gas-insulated switchgear (GIS) device, a photonic module fixture, a photonic counting probe, and a photonic counting unit. The GIS device has an observation window, which is connected to the photonic module fixture. The observation window is used to transmit photonic signals emitted by the metal powder. The photonic module fixture is designed with a light-shielding structure. The photonic counting probe is located inside the photonic module fixture and is used to receive photonic signals. The photonic counting unit is connected to the photonic counting probe and is used to count the number of photonic signals. The detection system 10 of the metal powder detection device inside the GIS includes a first detection module 100, a second detection module 200, and a judgment module 300.

[0057] The first detection module 100 is used to fill the cavity of the GIS device with a preset gas under preset light-shielding conditions and apply a preset voltage to the cavity, and detect the number of photon signals in the cavity under a stable state after a preset time; the second detection module 200 is used to apply voltage to the cavity according to a preset voltage boosting strategy and use a photon counting probe and a photon counting unit to detect the current number of photon signals in the cavity; the judgment module 300 is used to determine that there are metal micropowders in motion in the cavity if the current number of photon signals is greater than the number of photon signals in a stable state.

[0058] Optionally, in some embodiments, after determining whether the number of current photon signals is greater than the number of photon signals in a stable state, the determination modulus 300 is further configured to: if the number of current photon signals is less than or equal to the number of photon signals in a stable state, then determine that there are no metal micropowders in motion in the cavity.

[0059] Optionally, in some embodiments, the light-shielding structure is a soft, opaque light-shielding layer.

[0060] Optionally, in some embodiments, the viewing window is made of quartz glass.

[0061] Optionally, in some embodiments, the preset shading condition is a background value of less than 80 photons per second.

[0062] It should be noted that the foregoing explanation of the detection method embodiment of the GIS internal metal powder detection device also applies to the detection system of the GIS internal metal powder detection device in this embodiment, and will not be repeated here.

[0063] The detection system of the GIS internal metal powder detection device proposed in this application involves filling the cavity of the GIS equipment with a preset gas under preset light-shielding conditions and applying a preset voltage to the cavity. After a preset time, the number of photon signals in a stable state within the cavity is detected. A voltage is then applied to the cavity according to a preset voltage boosting strategy. The number of current photon signals within the cavity is detected using a photon counting probe and a photon counting unit. If the current number of photon signals is greater than the number of photon signals in a stable state, it is determined that there are moving metal powders within the cavity. This solves the problems of most conventional methods for measuring metal powder through partial discharge being greatly affected by environmental noise and having difficulty detecting moving metal powders. It can detect and analyze weak light signals caused by metal powders and has advantages such as strong anti-electromagnetic interference, strong insulation, and high sensitivity.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable instructions for implementing logical functions, and can be specifically implemented in any computer program product for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer program product" can be any means that can contain, store, communicate, propagate, or transmit a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer program products include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic device, and portable optical disc read-only memory (CDROM). Furthermore, the computer program product can even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0068] 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.

[0069] 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 program product, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0070] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer program product.

[0071] The computer program product mentioned above may be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A detection method for a metal micro-powder detection device inside a GIS, characterized in that, The metal micropowder detection device includes a gas-insulated switchgear (GIS) device, a photonic module fixture, a photonic counting probe, and a photonic counting unit. The GIS device has an observation window, and the photonic module fixture is connected to the observation window. The observation window is used to transmit photonic signals emitted by the metal micropowder. The photonic module fixture is designed with a light-shielding structure. The photonic counting probe is located inside the photonic module fixture and is used to receive photonic signals. The photonic counting unit is connected to the photonic counting probe and is used to count the number of photonic signals. The method includes the following steps: Under preset light-shielding conditions, a preset gas is filled into the cavity of the GIS device, and a preset voltage is applied to the cavity. After a preset time, the number of photon signals in the cavity under a stable state is detected. A voltage is applied to the cavity according to a preset boosting strategy, and the number of current photon signals in the cavity is detected using the photon counting probe and the photon counting unit. It is determined whether the number of current photon signals is greater than the number of photon signals in a stable state. If the number of current photon signals is greater than the number of photon signals in a stable state, it is determined that there are metal microparticles in motion in the cavity. The preset voltage boosting strategy can be stepped voltage boosting or uniform voltage boosting. The AC voltage adopts stepped voltage boosting, and the DC voltage adopts uniform voltage boosting.

2. The method according to claim 1, characterized in that, After determining whether the current number of photon signals is greater than the number of photon signals in a stable state, the method further includes: If the number of current photon signals is less than or equal to the number of photon signals in a stable state, then it is determined that there are no moving metal microparticles in the cavity.

3. The method according to claim 1, characterized in that, The light-shielding structure is a soft, opaque light-shielding layer.

4. The method according to claim 1, characterized in that, The observation window is made of quartz glass.

5. The method according to claim 1, characterized in that, The preset shading condition is that the background value is less than 80 photons per second.

6. A detection system for a metal micro-powder detection device inside a GIS, characterized in that, The metal micropowder detection device includes a gas-insulated switchgear (GIS) device, a photonic module fixture, a photonic counting probe, and a photonic counting unit. The GIS device has an observation window, and the photonic module fixture is connected to the observation window. The observation window is used to transmit photon signals emitted by the metal micropowder. The photonic module fixture is designed with a light-shielding structure. The photonic counting probe is located within the photonic module fixture and is used to receive photon signals. The photonic counting unit is connected to the photonic counting probe and is used to count the number of photon signals. The device includes: The first detection module is used to fill the cavity of the GIS device with a preset gas under preset light-blocking conditions, apply a preset voltage to the cavity, and detect the number of photon signals in the cavity under a stable state after a preset time. The second detection module is used to apply voltage to the cavity according to a preset boost strategy, and to detect the number of current photon signals in the cavity using the photon counting probe and the photon counting unit; The judgment module is used to determine that there are moving metal microparticles in the cavity if the number of current photon signals is greater than the number of photon signals in a stable state. The preset voltage boosting strategy can be stepped voltage boosting or uniform voltage boosting. The AC voltage adopts stepped voltage boosting, and the DC voltage adopts uniform voltage boosting.

7. The system according to claim 6, characterized in that, After determining whether the number of current photon signals is greater than the number of photon signals in a stable state, the determining module is further configured to: If the number of current photon signals is less than or equal to the number of photon signals in a stable state, then it is determined that there are no moving metal microparticles in the cavity.

8. The system according to claim 6, characterized in that, The light-shielding structure is a light-shielding layer made of a soft, opaque material.

9. The system according to claim 6, characterized in that, The observation window is made of quartz glass.

10. The system according to claim 6, characterized in that, The preset shading condition is that the background value is less than 80 photons per second.

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