Detection method and system of GIS internal metal micro powder detection device

Abstract

The invention relates to the technical field of metal foreign matter detection, in particular to a detection method and system of a GIS internal metal micro powder detection device, and the method comprises the steps: filling a cavity of GIS equipment with preset gas under a preset shading condition, applying preset voltage to the cavity, and detecting the number of photon signals in a stable state in the cavity after preset time; applying voltage to the cavity according to a preset boosting strategy, and detecting the number of current photon signals in the cavity by using the photon counting probe and the photon counting unit; if the number of the current photon signals is larger than that of the photon signals in the stable state, it is judged that the metal micro powder in the moving state exists in the cavity. Therefore, the problems that most conventional methods for measuring the metal micro-powder through partial discharge are greatly influenced by environmental noise and the metal micro-powder in a moving state is difficult to detect are solved, weak optical signals caused by the metal micro-powder can be detected and analyzed, and the method has the advantages of being high in electromagnetic interference resistance, high in insulativity, high in sensitivity and the like.

Description

Technical Field

[0001] The present application relates to the technical field of metal foreign body detection, and in particular to a detection method and system for a metal powder detection device inside a GIS. Background Art

[0002] Gas Insulated Switchgear (GIS) has been widely used in power systems due to its advantages of small footprint, environmental friendliness, and high safety. It is a key device in today's power transmission and distribution network systems. Studies have found that among various types of GIS equipment failures, the discharge failure rate caused by metal powder and foreign matter is as high as 20%.

[0003] Micro-nano level metal powder is the most common pollutant inside the GIS cavity. The powder may come from friction during installation, expansion and contraction of high-voltage conductors during operation, and wear during the opening and closing of switches. This type of micro-nano powder is easily deposited on insulation, connectors and contact points, resulting in electric field concentration, decreased insulation withstand voltage, and increased risk of partial discharge and flashover.

[0004] Existing detection methods, such as pulse current method, ultra-high frequency method, ultrasonic method, etc., mostly achieve indirect detection of metal powder by detecting the current, electromagnetic waves, and ultrasonic waves caused by local discharge induced by metal foreign matter. Most conventional local discharge measurement methods can detect metal powder that causes stronger local discharge or even insulation flashover, but are greatly affected by environmental noise and it is difficult to detect metal powder in motion. Summary of the invention

[0005] The present application provides a detection method and system for a metal powder detection device inside a GIS, so as to solve the problems that most conventional partial discharge methods for measuring metal powder are greatly affected by environmental noise and it is difficult to detect metal powder in motion.

[0006] In a first aspect, an embodiment of the present application provides a detection method for a metal powder detection device inside a GIS, wherein the metal powder detection device comprises a gas insulated switchgear GIS device, a photon module tooling, a photon counting probe and a photon counting unit, wherein the GIS device has an observation window, the photon module tooling is connected to the observation window, the observation window is used to transmit photon signals emitted by metal powder, the photon module tooling is designed with a shading structure, the photon counting probe is located in the photon module tooling, the photon counting probe is used to receive photon signals, the photon counting unit is connected to the photon counting probe, and the photon counting unit is used to count the photon signals The method comprises the following steps: filling a preset gas into the cavity of the GIS device under a preset shading condition, applying a preset voltage to the cavity, and detecting the number of photon signals in a stable state in the cavity after a preset time; applying a voltage to the cavity according to a preset boosting strategy, and detecting the number of current photon signals in the cavity by using the photon counting probe and the photon counting unit; judging whether the number of current photon signals is greater than the number of photon signals in a stable state, and if the number of current photon signals is greater than the number of photon signals in a stable state, judging that there is metal micropowder in motion in the cavity.

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

[0008] Optionally, the shading structure is a soft, light-proof shading layer.

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

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

[0011] In a second aspect, an embodiment of the present application provides a detection system for a metal powder detection device inside a GIS, wherein the metal powder detection device comprises a gas-insulated switchgear GIS device, a photon module tooling, a photon counting probe and a photon counting unit, wherein the GIS device has an observation window, the photon module tooling is connected to the observation window, the observation window is used to transmit photon signals emitted by metal powders, the photon module tooling is designed with a shading structure, the photon counting probe is located in the photon module tooling, the photon counting probe is used to receive photon signals, the photon counting unit is connected to the photon counting probe, and the photon counting unit is used to count The method comprises: a first detection module, which is used to fill a preset gas into the cavity of the GIS device under a preset shading condition, 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, which is used to apply a voltage to the cavity according to a preset boosting strategy, and use the photon counting probe and the photon counting unit to detect the number of current photon signals in the cavity; and a judgment module, which is used to determine that there is metal micropowder in motion in the cavity if the number of current photon signals is greater than the number of photon signals in a stable state.

[0012] Optionally, after determining whether the number of the current photon signals is greater than the number of photon signals in a stable state, the determination module is further used to determine that there is no metal powder in motion in the cavity if the number of the current photon signals is less than or equal to the number of photon signals in a stable state.

[0013] Optionally, the shading structure is a soft, light-proof shading layer.

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

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

[0016] In the above implementation, a preset gas is filled into the cavity of the GIS device under a preset shading condition, and a preset voltage is applied to the cavity. After a preset time, the number of photon signals in a stable state in the cavity is detected, and a voltage is applied to the cavity according to a preset boost strategy. 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 a stable state, it is determined that there are metal micropowders in motion in the cavity. This solves the problem that most conventional partial discharge methods for measuring metal micropowders are greatly affected by environmental noise and are difficult to detect metal micropowders in motion. It can detect and analyze weak light signals caused by metal micropowders and has the advantages of strong anti-electromagnetic interference, strong insulation and high sensitivity.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 This is a flow chart of a detection method of a metal powder detection device inside a GIS provided according to an embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the structure of a device for detecting metal powder inside a GIS according to an embodiment of the present application;

[0021] Figure 3 A schematic diagram of building a metal micropowder photon measurement test platform according to an embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of photon measurement results of copper powder under different voltage forms according to one embodiment of the present application;

[0023] Figure 5 This is an example diagram of a detection system of a GIS internal metal powder detection device according to an embodiment of the present application. Description of the drawings:

[0025] 10-Detection system of the metal powder detection device inside GIS; 100-first detection module; 200-second detection module; 300-judgment module. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0027] The following describes the detection method and system of the GIS internal metal powder detection device of the embodiment of the present application with reference to the accompanying drawings. In view of the problem that most of the conventional partial discharge methods for measuring metal powder mentioned in the above background technology are greatly affected by environmental noise and it is difficult to detect metal powder in motion, the present application provides a detection method for the GIS internal metal powder detection device, in which a preset gas is filled into the cavity of the GIS device under a preset light shielding condition, and a preset voltage is applied to the cavity. After a preset time, the number of photon signals in a stable state in the cavity is detected, and a voltage is applied to the cavity according to a preset boosting strategy. 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 a stable state, it is determined that there is metal powder in motion in the cavity. As a result, the problem that most of the conventional partial discharge methods for measuring metal powder are greatly affected by environmental noise and it is difficult to detect metal powder in motion is solved, and the weak light signal caused by metal powder can be detected and analyzed, and it has the advantages of strong anti-electromagnetic interference, strong insulation and high sensitivity.

[0028] Since metal micropowders are commonly present in the GIS cavity, on the one hand, when the metal micropowders are stationary, the electric field at the metal tip is severely distorted, which will cause gas ionization and release photons; on the other hand, metal micropowders will inevitably move under the action of the electric field under GIS working conditions. When the micropowders collide with each other during the movement and collide with the plates, intense charge exchange occurs and a large number of photons are emitted.

[0029] Photon measurement technology collects and counts single photons based on the photoelectric effect. Single-photon detection is an ultra-low noise detection technology. Its enhanced sensitivity enables it to detect the smallest energy unit of light - photons. Single-photon detectors can detect and count single photons, thereby realizing the detection of extremely weak target signals.

[0030] Therefore, the embodiment of the present application proposes a method of detecting the weak light signal generated when the metal powder moves by photon measurement technology, which can effectively detect the metal powder inside the GIS.

[0031] Specifically, Figure 1 A schematic flow chart of a detection method for a GIS internal metal powder detection device provided in an embodiment of the present application.

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

[0033] Among them, the metal powder detection device includes a gas insulated switchgear GIS device, a photon module tooling, a photon counting probe and a photon counting unit, wherein the GIS device has an observation window, the photon module tooling is connected to the observation window, the observation window is used to transmit the photon signal emitted by the metal powder, the photon module tooling is designed with a shading structure, the photon counting probe is located in the photon module tooling, the photon counting probe is used to receive the photon signal, the photon counting unit is connected to the photon counting probe, and the photon counting unit is used to count the number of photon signals.

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

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

[0036] In step S102, 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.

[0037] It should be noted that, in the embodiment of the present application, the preset boost strategy may be a step boost or a uniform boost.

[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 powders in motion in 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, it also includes: if the number of current photon signals is less than or equal to the number of photon signals in a stable state, it is determined that there is no metal powder in motion in the cavity.

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

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

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

[0043] Specifically, the metal powder detection device is composed of a terminal, a photon counting unit, a photon counting probe, and a photon module tooling. Figure 2As shown. Among them, the photon module is the core equipment, which realizes the optical measurement of the single photon level inside the GIS. The photon module tooling serves as a container for the photon counting probe, which realizes close docking with the observation window of the GIS equipment. Due to the high sensitivity of the photon counting module, the tooling needs to pay special attention to the shading problem when using it. Use shading cloth or soft opaque material as a shading layer to prevent external light pollution from interfering with the measurement and ensure shading. In order to ensure the transmittance of ultraviolet rays, the material of the GIS equipment observation window should be quartz glass with sufficient structural strength, rather than conventional organic glass, and its transmission band basically covers the visible light, near ultraviolet and far ultraviolet bands.

[0044] In the process of implementing this embodiment, under the premise of ensuring that the light shielding property meets the requirements (i.e., the background value is less than 80 photons per second), a section of the GIS chamber is selected for thorough cleaning to ensure that there is no metal powder inside, and a preset gas (such as high-pressure SF6 gas) is filled into the cavity of the GIS equipment. Then, a preset voltage is applied to the cavity. After about 1 hour, the photon counting probe and the photon counting unit are used to detect the number of photon signals in the cavity in a stable state, and the stabilized photon counting level is used as the baseline value for the absence of metal powder.

[0045] Furthermore, the number of photon signals in a stable state is compared in real time with the number of current photon signals in the GIS chamber under test. 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 moving metal micropowders in the cavity. If the number of current 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 micropowders in the cavity.

[0046] Among them, the embodiment of the present application also explores the technical effect of the embodiment of the present application through a flat electrode test.

[0047] Specifically, the size of metal powder in GIS equipment is much smaller than the equipment structure. Therefore, for metal powder at a certain position in the GIS chamber, due to its small size, it is equivalent to being in a relatively stable electric field at this moment. The field strength between the parallel plates is extremely uniform, which can meet the field strength at the location of the particles, and the field strength at various positions inside the GIS equipment can be simulated by changing the distance between the plates and applying voltage. Therefore, the technical effect of the above invention can be explored through the flat electrode test.

[0048] Build as Figure 3The test platform shown is composed of a computer, a photon counting probe, a photon counting unit, a test chamber, a flat electrode, an excitation power supply and a light-shielding environment; the excitation power supply is used to provide an initial DC / AC voltage excitation volt (V) level, and the excitation voltage is amplified to the kV level by connecting to a non-partial discharge transformer, and then connected to the measuring electrode, and the metal powder is placed between the flat electrodes. An observation window is opened on the test chamber of the flat electrode, and the photon counting probe is located in the front observation window at the level of the flat electrode, so that the luminescence of the metal powder can be better observed. The photon counting card is connected to the photon counting probe to analyze the number of light pulses output by the photon counting probe within a given integration time period, and then the photon counting card is connected to the computer via USB to output the photon counting information.

[0049] The metal powder used in the test is copper powder with a particle size range of 10 to 100 microns. During the test, the metal powder is thoroughly cleaned in an anhydrous ethanol ultrasonic cleaner. After drying, 0.1g of metal powder is weighed and evenly placed in an area of ​​about 1cm in the center of the ground plate. After the test chamber is evacuated, the SF6 recovery device is used in conjunction with the corresponding gas cylinder to make the internal pressure of the test chamber reach 0.3MPa. During the test, the AC voltage is stepped up and the DC voltage is stepped up at a uniform speed. Each measurement test consists of two parts. The first part measures the background photon value when there is no metal powder; the second part is a formal experiment to measure the photon value when there is metal powder. Compare the results of the two parts of the test, and combine the starting voltage of the metal powder to comprehensively judge the degree of luminescence caused by the movement of the metal powder.

[0050] Verification test results such as Figure 4 As shown in the figure, the step voltage range under AC voltage is set to 5-14kV, and when the applied voltage is below 11kV, the number of photons surges briefly at the moment of pressurization, and then drops back to the level of the particle-free state, corresponding to the movement characteristics of the powder bouncing at the moment of pressurization and then the weakening of the movement of the micro-powder (a considerable part of the moving micro-powder moves outside the plate interval). As the applied voltage increases, when the voltage is 11kV and above, the photon value level in the whole process increases significantly relative to the particle-free state, corresponding to the "sandstorm"-like violent movement of the powder after pressurization, in which the collision between metal particles and the collision between particles and the plate will trigger micro-discharges and release a large number of photons, which is reflected in the obvious increase in the photon value level, as shown in Figure 1. Figure 4 (a) shown.

[0051] Under direct voltage, when the applied voltage is below about 8kV, the presence or absence of metal powder does not significantly affect the photon value, and the two are basically equal. However, as the voltage continues to rise, the photon value in the powder state increases significantly compared to the state without powder. Under the influence of metal powder, the number of photons increases to varying degrees with the voltage, and two peaks appear at about 13kV and 16kV, which are 1007 at 42s and 1564 at 52s, respectively. Figure 4 (b) as shown.

[0052] It can be seen that under different voltage forms, the photon measurement curves of copper powder are significantly different from the background values ​​in the state without particles, indicating that the movement of metal micropowders 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 embodiment of the present application, a preset gas is filled into the cavity of the GIS device under a preset shading condition, and a preset voltage is applied to the cavity. After a preset time, the number of photon signals in a stable state in the cavity is detected, and a voltage is applied to the cavity according to a preset boost strategy. 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 a stable state, it is determined that there is metal powder in motion in the cavity. Thus, the problem that most conventional partial discharge methods for measuring metal powder are greatly affected by environmental noise and are difficult to detect metal powder in motion is solved. The weak light signal caused by metal powder can be detected and analyzed, and it has the advantages of strong anti-electromagnetic interference, strong insulation and high sensitivity.

[0054] Next, the detection system of the metal powder detection device inside GIS proposed in the embodiment of the present application is described with reference to the accompanying drawings.

[0055] Figure 5 It is a block diagram of a detection system of a metal powder detection device inside a GIS according to an embodiment of the present application.

[0056] Among them, the metal powder detection device includes a gas insulated switchgear GIS device, a photon module tooling, a photon counting probe and a photon counting unit, wherein the GIS device has an observation window, the photon module tooling is connected to the observation window, the observation window is used to transmit the photon signal emitted by the metal powder, the photon module tooling is designed with a shading structure, the photon counting probe is located in the photon module tooling, the photon counting probe is used to receive the photon signal, the photon counting unit is connected to the photon counting probe, and the photon counting unit is used to count the number of photon 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] Among them, the first detection module 100 is used to fill the cavity of the GIS equipment with a preset gas under a preset shading condition, 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; the second detection module 200 is used to apply voltage to the cavity according to a preset boost 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 is metal micropowder 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, determination module 300 is further used to determine that no metal powder in motion exists in the cavity if the number of current photon signals is less than or equal to the number of photon signals in a stable state.

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

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

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

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

[0063] According to the detection system of the GIS internal metal powder detection device proposed in the embodiment of the present application, a preset gas is filled into the cavity of the GIS device under a preset shading condition, and a preset voltage is applied to the cavity. After a preset time, the number of photon signals in a stable state in the cavity is detected, and a voltage is applied to the cavity according to a preset boost strategy. 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 a stable state, it is determined that there is metal powder in motion in the cavity. Thus, the problem that most conventional partial discharge methods for measuring metal powder are greatly affected by environmental noise and are difficult to detect metal powder in motion is solved. The weak light signal caused by metal powder can be detected and analyzed, and it has the advantages of strong anti-electromagnetic interference, strong insulation and high sensitivity.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0067] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer program product for use with an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, a "computer program product" can be any device that can contain, store, communicate, propagate or transmit a program for use with an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer program products (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). Furthermore, the computer program product may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example by optically scanning the paper or other medium and then editing, interpreting or, if necessary, processing in another suitable manner, and then storing it in a computer memory.

[0068] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0069] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer program product, which, when executed, includes one or a combination of the steps of the method embodiment.

[0070] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may 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 the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A detection method for a metal powder detection device inside a GIS, characterized in that: The metal powder detection device comprises a gas insulated switchgear GIS device, a photon module tooling, a photon counting probe and a photon counting unit, wherein the GIS device has an observation window, the photon module tooling is connected to the observation window, the observation window is used to transmit the photon signal emitted by the metal powder, the photon module tooling is designed with a shading structure, the photon counting probe is located in the photon module tooling, the photon counting probe is used to receive the photon signal, the photon counting unit is connected to the photon counting probe, and the photon counting unit is used to count the number of the photon signal, wherein the method comprises the following steps: Filling a preset gas into the cavity of the GIS device under a preset light shielding condition, applying a preset voltage to the cavity, and 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 boosting strategy, and detecting the number of current photon signals in the cavity using the photon counting probe and the photon counting unit; It is determined whether the number of the current photon signal is greater than the number of the photon signal in a stable state. If the number of the current photon signal is greater than the number of the photon signal in a stable state, it is determined that there is metal powder in motion in the cavity.

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

3. The method according to claim 1, characterized in that The shading structure is a soft, light-proof shading 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 powder detection device inside a GIS, characterized in that: The metal powder detection device comprises a gas insulated switchgear GIS device, a photon module tooling, a photon counting probe and a photon counting unit, wherein the GIS device has an observation window, the photon module tooling is connected to the observation window, the observation window is used to transmit the photon signal emitted by the metal powder, the photon module tooling is designed with a shading structure, the photon counting probe is located in the photon module tooling, the photon counting probe is used to receive the photon signal, the photon counting unit is connected to the photon counting probe, and the photon counting unit is used to count the number of the photon signal, wherein, it includes: A first detection module is used to fill a preset gas into the cavity of the GIS device under a preset light shielding condition, 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 for applying voltage to the cavity according to a preset boost strategy, and detecting 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 judge that there are metal powders in motion in the cavity if the number of the current photon signals is greater than the number of the photon signals in a stable state.

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

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