Environment-friendly insulating gas circuit breaker testing device and method based on spectrum diagnosis

Abstract

The invention provides an environment-friendly insulating gas circuit breaker testing device and method based on spectrum diagnosis. The device comprises a test cavity filled with environment-friendly insulating gas; the static contact is arranged in the test cavity; the moving contact is arranged in the test cavity; the operating mechanism box is connected with the moving contact, controls the moving contact to move and seals one end of the test cavity; the sealing flange plate is arranged on the opposite side of the operating mechanism box and seals the other end of the test cavity; the wiring terminal is connected with an external circuit; one end of the electrode guide rod is connected with the wiring terminal, and the other end of the electrode guide rod is connected with the moving contact or the static contact; the insulating sleeve is arranged outside the electrode guide rod; the arc spectrum lens is arranged at the throat part and the downstream position of the nozzle of the moving contact in the test cavity; the vacuum optical fiber feed-through flange is arranged on a cavity body of the test cavity, a fused silica optical fiber and a Y-shaped fused silica optical fiber are arranged in the vacuum optical fiber feed-through flange, the fused silica optical fiber is connected with the arc spectrum lens, and the Y-shaped fused silica optical fiber is connected with the spectrograph.

Description

Technical Field

[0001] This application relates to the field of environmentally friendly gas-insulated power transmission and distribution equipment, specifically to a test device and method for environmentally friendly insulated gas circuit breakers based on spectral diagnostics. Background Technology

[0002] High-voltage circuit breakers widely use sulfur hexafluoride (SF6) as insulation and dielectric. However, SF6 has an extremely high greenhouse effect, with a global warming potential (GWP) 24,300 times that of CO2, and is listed as a strictly restricted greenhouse gas by international conventions. To reduce environmental impact, perfluoroisobutyronitrile (C4F7N), trifluoromethanesulfonyl fluoride (CF3SO2F), and fluoroketone gases (C5F) with excellent insulation and arc-extinguishing properties are used. 10 New environmentally friendly insulating gases such as O2 and their mixtures with gases such as CO2, N2, and O2 have attracted great attention from researchers at home and abroad and have begun to be applied to high-voltage environmentally friendly gas circuit breakers.

[0003] The switching arc formed during the breaking process of a new type of environmentally friendly insulated gas circuit breaker possesses characteristics such as high temperature, high electron density, and strong radiation. This arc triggers the decomposition of the insulating gas, which then undergoes physical-chemical reactions with electrode materials (such as Cu, Ag, W, and their alloys), generating various gaseous and solid decomposition products. The composition and concentration of these decomposition products dynamically change with factors such as arc parameters, gas ratio, pressure, moisture content, and contact materials. This, in turn, affects the insulation recovery strength of the medium, the heat dissipation and flow field characteristics of the arc-extinguishing chamber, and the contact erosion and lifespan, thus impacting the device's high-capacity breaking capacity and long-term reliability. Arc spectroscopy detection, because it requires no external light source and can obtain information such as electron density, particle concentration distribution, ionization degree, conductivity, and radiation characteristics in situ, is widely used for arc plasma diagnosis and decomposition process analysis.

[0004] However, existing experimental studies are mostly based on equivalent or scaled-down models, and spectral data of arc plasma under full-scale circuit breaker conditions have not yet been obtained. Due to the intense transients and complex spatial distribution of the arc during circuit breaker breaking, obtaining spectral data is quite challenging.

[0005] Therefore, in order to address the above issues, it is urgent to conduct spectral diagnostic tests on the actual devices of new environmentally friendly insulating gas circuit breakers in order to accurately measure and analyze the key parameters of the arc plasma. Summary of the Invention

[0006] This application provides an environmentally friendly insulated gas circuit breaker test device and method based on spectral diagnostics. It can acquire arc spectral data under the actual circuit breaker structure and operating conditions, avoiding data distortion caused by differences in gas volume, compression process and arc channel in scaled-down model tests, thereby ensuring that the obtained results have higher engineering applicability and accuracy.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] In the first aspect, this application provides an environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics, including:

[0009] The test chamber is filled with environmentally friendly insulating gas;

[0010] The stationary contact is located inside the test chamber;

[0011] The moving contact is located inside the test chamber;

[0012] The operating mechanism box is connected to the moving contact, controls the movement of the moving contact, and seals one end of the test chamber.

[0013] A sealing flange is located on the opposite side of the operating mechanism box to seal the other end of the test chamber;

[0014] Terminal blocks are used to connect to external circuits.

[0015] The electrode guide rod is connected to the terminal block at one end and to the moving or stationary contact at the other end.

[0016] An insulating sleeve is installed outside the electrode guide rod;

[0017] An arc spectral lens is positioned downstream of the moving contact nozzle inside the test chamber.

[0018] The vacuum fiber feedthrough flange is installed on the cavity of the test chamber. It contains fused silica fiber and Y-type fused silica fiber. The fused silica fiber is connected to the arc spectral lens, and the Y-type fused silica fiber is connected to the spectrometer.

[0019] One possible design, the first aspect of the device, also includes that the test chamber is made of aluminum alloy 5754 material that is resistant to high temperature, high pressure and chemical corrosion.

[0020] One possible design, the first aspect of the device, further includes that the stationary contact and the moving contact are made of a composite metal material with high conductivity and resistance to arc erosion.

[0021] One possible design, the first aspect of the device, also includes an insulating sleeve made of a composite insulating material that is resistant to high temperatures and chemical corrosion.

[0022] One possible design, the first aspect of the device, further includes an arc spectral lens that is a high-transmittance focusing lens made of fused silica, which is sufficient for spectral acquisition in the 200–1000 nm wavelength range.

[0023] One possible design scheme, the first aspect of the device further includes a fused silica optical fiber with a bare fiber structure, a diameter of 1000 μm, ultraviolet to visible light transmission performance, and a transmission band covering 200–1000 nm.

[0024] One possible design, the first aspect of the device, also includes a Y-type fused silica optical fiber with an encapsulated structure, a diameter of 1000 μm, ultraviolet to visible light transmission performance, and a transmission band covering 200–1000 nm.

[0025] One possible design scheme, the first aspect of the device, further includes a vacuum fiber feedthrough flange, fused silica fiber and Y-type fused silica fiber both ends adopting SMA905 standard interfaces; the fused silica fiber is connected to the arc spectral lens through the SMA905 standard interface, and the end face of the fused silica fiber is located at the focal length position of the arc spectral lens.

[0026] One possible design scheme, the first aspect of the device, also includes a spectrometer with a wavelength range of 200 to 1000 nm, a spectral resolution better than 0.1 nm, and a minimum integration time of 1 ms.

[0027] Secondly, this application provides a test method for environmentally friendly insulating gas circuit breakers based on spectral diagnostics, the method comprising:

[0028] Test gas (S1) is a binary or ternary environmentally friendly insulating mixture of gases, which is then filled into the test chamber.

[0029] Test circuit (S2), a high-voltage test circuit is set up;

[0030] Spectral acquisition (S3): Construct a spectral acquisition optical path to record the dynamic spectrum of the moving contact nozzle throat and downstream position;

[0031] Spectral diagnostics (S4) utilizes spectral line intensity ratio, spectral line broadening, and radiative transport model methods to invert electron density, particle concentration distribution, degree of ionization, conductivity, and temperature parameters. Combined with different gas ratios and pressure conditions, the evolution of arc plasma is analyzed.

[0032] In this embodiment, by directly placing the arc spectral lens at the throat and downstream position of the moving contact nozzle inside the test chamber, the spectral signal of the entire arc discharge process during the closing or opening action of the circuit breaker can be acquired. The spectral signal is then transmitted to the vacuum fiber feedthrough flange via fused silica fiber, led out of the device via a sealed interface, and then connected to the input port of a high-resolution spectrometer via a Y-type fused silica fiber. The spectrometer then converts the spectral signal into an electrical signal, which technicians can use to invert the electron density, particle concentration distribution, ionization degree, conductivity, and radiation characteristics of the arc plasma based on the electrical signal and plasma diagnostic methods. Finally, the spectral evolution law under different gas ratios, pressures, and contact materials is calculated, providing a basis for analyzing the decomposition behavior of the arc on environmentally friendly mixed gases.

[0033] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 An exploded view of the environmentally friendly insulating gas circuit breaker test device based on spectral diagnostics provided in this application embodiment;

[0036] Figure 2 A schematic diagram of the combined structure of the environmentally friendly insulating gas circuit breaker test device based on spectral diagnostics provided in this application embodiment;

[0037] Figure 3 This is a schematic diagram of the structure of the moving contact and the arc spectral lens provided in the embodiments of this application;

[0038] Figure 4 This is a schematic diagram of the structure of the vacuum fiber optic feedthrough flange provided in the embodiments of this application;

[0039] Figure 5 A schematic flowchart of the environmentally friendly insulating gas circuit breaker test method based on spectral diagnostics provided in the embodiments of this application;

[0040] In the figure, 1-test chamber; 2-stationary contact; 3-moving contact; 4-operating mechanism box; 5-sealing flange; 6-terminal; 7-electrode rod; 8-insulating sleeve; 9-arc spectral lens; 10-vacuum fiber feedthrough flange; 11-fused silica fiber; 12-Y-type fused silica fiber. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments in this specification clearer, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. The components of the embodiments of this specification described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of this specification provided in the accompanying drawings is not intended to limit the scope of the claimed specification, but merely to illustrate selected embodiments of this specification. All other embodiments obtained by those skilled in the art based on the embodiments in this specification without inventive effort are within the scope of protection of this specification.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the description of the embodiments in this specification, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These are merely for the convenience of describing this specification and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this specification. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the description of the embodiments in this specification, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0047] The following section will introduce the environmentally friendly insulating gas circuit breaker test device based on spectral diagnostics of this application. This device can acquire arc spectrum data under the actual circuit breaker structure and actual working conditions, avoiding the data distortion problem caused by differences in gas volume, compression process and arc channel in scaled-down model tests, thereby ensuring that the obtained results have higher engineering applicability and accuracy.

[0048] Figure 1 This is an exploded view of the environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics provided in the embodiments of this application. Figure 2 A schematic diagram of the combined structure of the environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics provided in this application embodiment. Figure 1 and Figure 2 As shown, the environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics includes:

[0049] Test chamber 1 is filled with environmentally friendly insulating gas;

[0050] The stationary contact 2 is located inside the test chamber 1;

[0051] The moving contact 3 is located inside the test chamber 1;

[0052] The operating mechanism box 4 is connected to the moving contact 3, controls the movement of the moving contact 3, and seals one end of the test chamber 1;

[0053] The sealing flange 5 is located on the opposite side of the operating mechanism box 4, sealing the other end of the test chamber 1;

[0054] Terminal 6 is connected to an external circuit.

[0055] The electrode rod 7 is connected at one end to the terminal 6 and at the other end to the moving contact 3 or the stationary contact 2;

[0056] An insulating sleeve 8 is installed outside the electrode guide rod 7;

[0057] An arc spectral lens 9 is positioned downstream of the moving contact nozzle inside the test chamber 1.

[0058] The vacuum fiber feedthrough flange 10 is installed on the cavity of the test chamber 1. Fused silica fiber 11 and Y-type fused silica fiber 12 are installed inside. The fused silica fiber 11 is connected to the arc spectral lens 9, and the Y-type fused silica fiber 12 is connected to the spectrometer.

[0059] Among them, the aforementioned environmentally friendly insulating gases are generally selected according to the test requirements, namely C4F7N, CF3SO2F, and C5F. 10 O and other gases are mixed with buffer gases CO2, O2, and N2 in a specific ratio to obtain a binary or ternary mixed gas, which is then filled into the test chamber.

[0060] Furthermore, the above proportions are generally formulated using the Daltonian partial pressure principle to ensure that the gas ratio error does not exceed ±0.5%. The filling pressure is controlled within the range of 0–1 MPa, and the composition is verified using gas chromatography-mass spectrometry to ensure the accuracy and repeatability of the gas environment.

[0061] In this embodiment, the test chamber 1 is made of aluminum alloy 5754, which is resistant to high temperature, high pressure, and chemical corrosion. It is understood that this device fully considers gas-solid compatibility to ensure that the chamber material has good chemical corrosion resistance under the action of high-temperature electric arc and decomposition products; it also possesses high insulation strength, capable of withstanding a maximum rated test voltage of 252kV; and it has excellent gas pressure resistance to conduct stable and reliable tests.

[0062] In this embodiment, the stationary contact 2 and the moving contact 3 are made of a composite metal material with high conductivity and resistance to arc erosion, which ensures the electrical contact stability and durability during the breaking process and can generate typical arc plasma discharge characteristics during the breaking process.

[0063] In this embodiment, the insulating bushing 8 is made of a composite insulating material that is resistant to high temperatures and chemical corrosion, ensuring stable performance under the long-term action of gases such as C4F7N and CF3SO2F and their decomposition products. Furthermore, the insulating bushing possesses excellent insulation strength, capable of withstanding a rated test voltage of 252kV, while also exhibiting good mechanical strength and thermal shock resistance, able to withstand the thermal stress and mechanical impact generated by arc discharge.

[0064] In this embodiment, as Figure 3 As shown, the arc spectral lens 9 is positioned inside the test chamber 1 at the throat and downstream of the moving contact nozzle. The arc spectral lens 9 is a high-transmittance focusing lens made of fused silica, capable of spectral acquisition in the 200–1000 nm wavelength range. This lens material possesses excellent thermal stability and thermal shock resistance, allowing for long-term operation under the high-temperature radiation environment of arc plasma, with a maximum withstand temperature of up to 1100℃. Furthermore, this lens effectively focuses the arc light radiation signal, improving the sensitivity and signal-to-noise ratio of spectral signal acquisition.

[0065] In addition, such as Figure 4 As shown, the aforementioned vacuum fiber optic feedthrough flange 10 is installed on the cavity of the test chamber 1. This can be understood as the test chamber 1 having a window for housing the vacuum fiber optic feedthrough flange 10, through which the spectral signal collected by the arc spectral lens 9 is transmitted. It should also be noted that the vacuum fiber optic feedthrough flange 10 can seal the test chamber 1, preventing the interior of the test chamber 1 from communicating with the outside through the window gap.

[0066] In this embodiment, the fused silica fiber 11 is a bare fiber structure with a diameter of 1000 μm, and has ultraviolet to visible light transmission performance, covering a transmission band of 200–1000 nm.

[0067] In this embodiment, the Y-type fused silica fiber 12 adopts an encapsulation structure, has a diameter of 1000 μm, and exhibits ultraviolet to visible light transmission performance, covering a transmission band of 200–1000 nm. This encapsulation structure ensures the mechanical reliability of the fiber during handling and use. Furthermore, this fiber employs a Y-type beam splitting design, allowing for flexible configuration based on the number of channels in the spectrometer and the acquisition requirements.

[0068] In this embodiment, the arc spectral lens 9, the vacuum fiber feed flange 10, the fused silica fiber 11, and the Y-type fused silica fiber 12 all use SMA905 standard interfaces at both ends. This unified interface facilitates connection and ensures reliable transmission of spectral signals. In addition, this interface can avoid interference from the external environment on the spectral signals.

[0069] In this embodiment, the fused silica fiber 11 is connected to the arc spectral lens 9, including: the fused silica fiber 11 is connected to the arc spectral lens 9 through the SMA905 standard interface, and the end face of the fused silica fiber (11) is located at the focal length position of the arc spectral lens 9.

[0070] In this embodiment, the spectrometer acquires wavelengths ranging from 200 to 1000 nm, with a spectral resolution better than 0.1 nm and a minimum integration time of 1 ms. It can be understood that the spectrometer possesses high sensitivity detection capabilities and a wide spectral response range, covering a wavelength range of 200–1000 nm, which can meet the requirements for detecting characteristic peaks in arc plasma spectra. The instrument's spectral resolution is better than 0.1 nm, enabling the resolution and analysis of the fine structure of arc spectra. The spectrometer is equipped with a high-speed data acquisition module, with a minimum integration time of 1 ms, achieving millisecond-level time-resolved spectral acquisition. Combined with plasma diagnostic methods, it can perform real-time diagnostic analysis of electron density, particle concentration distribution, ionization degree, and radiation characteristics.

[0071] The above combination Figures 1-4 This application provides a detailed description of the environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics, as described below. Figure 5This describes the test method for environmentally friendly insulating gas circuit breakers based on spectral diagnostics.

[0072] Test gas (S1) is a binary or ternary environmentally friendly insulating mixture of gases, which is then filled into the test chamber.

[0073] Test circuit (S2), a high-voltage test circuit is set up;

[0074] Spectral acquisition (S3): Construct a spectral acquisition optical path to record the dynamic spectrum of the moving contact nozzle throat and downstream position;

[0075] Spectral diagnostics (S4) utilizes spectral line intensity ratio, spectral line broadening, and radiative transport model methods to invert electron density, particle concentration distribution, degree of ionization, conductivity, and temperature parameters. Combined with different gas ratios and pressure conditions, the evolution of arc plasma is analyzed.

[0076] The aforementioned test gas (S1) includes: evacuating the test chamber and then filling it with buffer gas, repeating this process three or more times to complete the gas washing operation. A binary or ternary mixed gas is then introduced using an environmentally friendly insulating gas mixer, and the mixed gas is analyzed using a gas chromatograph to confirm that it is free of impurities and that the mixing ratio meets the test requirements.

[0077] The aforementioned test circuit (S2) includes: debugging the test voltage and current of the arc characteristic simulation test circuit, debugging the timing of the arc characteristic simulation test device and the test circuit, the arc extinguishing structure of the arc simulation test device, and the disassembly, assembly, and debugging of the operating mechanism.

[0078] The above-mentioned spectral acquisition (S3) includes: installing an arc spectral lens at the nozzle and downstream orifice, spectral acquisition path, adjusting the synchronous trigger signal of the spectrometer, and conducting test experiments.

[0079] The aforementioned spectral diagnostics (S4) include: using methods such as spectral line intensity ratio, spectral line broadening, and radiative transport models to invert key parameters such as electron density, particle concentration distribution, degree of ionization, conductivity, and temperature; and combining these with different gas ratios and pressure conditions to analyze the evolution of arc plasma and gas decomposition behavior. Furthermore, the aforementioned spectral line intensity ratio, spectral line broadening, and radiative transport model methods are merely examples; other possible methods may also be included, but not all are listed here.

[0080] It should also be noted that the above-mentioned spectral line intensity ratio, spectral line broadening, and radiative transport methods can be understood with reference to the following, or in conjunction with existing technologies.

[0081] 1. Spectral line intensity ratio

[0082] For a plasma in approximate local thermodynamic equilibrium, the ratio of the radiation intensity of two transition spectral lines i and j of a certain element follows a Boltzmann distribution:

[0083]

[0084] Where: I is the spectral line integral intensity; g is the upper level degeneracy; A is the Einstein spontaneous emission coefficient; λ is the center wavelength; E is the upper level excitation energy; T e For electron temperature; k B为 Boltzmann constant.

[0085] 2. Spectral line broadening method

[0086] Stark broadening is primarily used to determine electron density.

[0087] Δλ 1 / 2 =2w(n) e / 10 16 cm -3 (1.2)

[0088] Where: Δλ 1 / 2 is the half-width at half-maximum (FWHM); w is the Stark coefficient, which is related to temperature and transition.

[0089] 3. Radiative transport model

[0090] Under high voltage and high density electric arc conditions, self-absorption and radial distribution must be considered. A one-dimensional planar or cylindrical symmetric model can be used, with the following basic equations:

[0091] Among them: I λ κ represents the monochromatic radiation intensity along path s; λ B is the absorption coefficient (which depends on particle concentration and transition cross section); λ (T) is the Planck function.

[0092] The following examples illustrate how to apply the above-mentioned device:

[0093] A mixed gas of 6% C4F7N, 8% O2, and 84% CO2 was selected as the insulating and arc-extinguishing medium. The gas filling pressure of the test chamber was 0.6 MPa, and the circuit breaker breaking test was carried out under the rated test voltage of 252 kV or the external circuit voltage of 252 kV.

[0094] The opening and closing of the contacts is driven by the operating mechanism box, forming a typical circuit breaker arc breaking process. In addition, the test circuit is equipped with overcurrent protection, grounding protection, and voltage monitoring devices to ensure the safety of the test.

[0095] Simultaneously with the contact breaking action, the arc spectral lens acquires the spectral signal of the entire arc discharge process at the throat of the moving contact nozzle and downstream of the nozzle. This signal is then transmitted to the vacuum fiber feedthrough flange via a 1000μm diameter fused silica fiber, and finally split and coupled to a high-resolution spectrometer via a hermetically sealed optical path interface device.

[0096] Subsequently, the spectrometer converts the spectral signal into an electrical signal, such as converting a 1ms spectrum into an electrical signal. Using methods such as spectral line intensity ratio, spectral line broadening, and radiative transport models, key parameters such as electron density, particle concentration distribution, degree of ionization, conductivity, and temperature are retrieved. Combined with different gas ratios and pressure conditions, the evolution of the arc plasma and gas decomposition behavior are analyzed. Compared with the results of scaled-down model experiments, the data obtained by this full-scale experimental device more closely reflects the actual operating conditions of circuit breakers.

[0097] In summary, by directly placing the arc spectral lens inside the test chamber at the throat and downstream position of the moving contact nozzle, the spectral signal of the entire arc discharge process during the circuit breaker's closing or opening action can be acquired. The spectral signal is then transmitted via fused silica fiber to a vacuum fiber feedthrough flange, led out of the device via a sealed interface, and then connected to the input port of a high-resolution spectrometer via a Y-type fused silica fiber. The spectrometer then converts the spectral signal into an electrical signal, which technicians can use to invert the electron density, particle concentration distribution, ionization degree, conductivity, and radiation characteristics of the arc plasma based on this electrical signal and plasma diagnostic methods. Finally, the spectral evolution under different gas ratios, pressures, and contact materials can be calculated, providing a basis for analyzing the decomposition behavior of the arc on environmentally friendly mixed gases.

[0098] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in the details for the sake of brevity.

[0099] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A test device for environmentally friendly insulating gas circuit breakers based on spectral diagnostics, characterized in that, include: The test chamber (1) is filled with environmentally friendly insulating gas; A stationary contact (2) is disposed inside the test chamber (1); The moving contact (3) is disposed inside the test chamber (1); The operating mechanism box (4) is connected to the moving contact (3), controls the movement of the moving contact (3), and seals one end of the test chamber (1); A sealing flange (5) is located on the opposite side of the operating mechanism box (4) to seal the other end of the test chamber (1); Terminal (6) is connected to an external circuit; The electrode rod (7) is connected at one end to the terminal block (6) and at the other end to the moving contact (3) or the stationary contact (2); An insulating sleeve (8) is disposed outside the electrode rod (7); An arc spectral lens (9) is disposed inside the test chamber (1) downstream of the moving contact nozzle; A vacuum fiber feedthrough flange (10) is installed on the cavity of the test chamber (1). Fused silica fiber (11) and Y-type fused silica fiber (12) are installed inside the cavity. The fused silica fiber (11) is connected to the arc spectral lens (9), and the Y-type fused silica fiber (12) is connected to the spectrometer.

2. The environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics according to claim 1, characterized in that, The test chamber (1) is made of aluminum alloy 5754 material that is resistant to high temperature, high pressure and chemical corrosion.

3. The environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics according to claim 1, characterized in that, The stationary contact (2) and the moving contact (3) are made of a composite metal material with high conductivity and resistance to arc erosion.

4. The environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics according to claim 1, characterized in that, The insulating sleeve (8) is made of a composite insulating material that is resistant to high temperature and chemical corrosion.

5. The environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics according to claim 1, characterized in that, The arc spectral lens (9) is a high-transmittance focusing lens made of fused silica, which meets the requirements for spectral acquisition in the 200-1000nm wavelength range.

6. The environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics according to claim 1, characterized in that, The fused silica fiber (11) is a bare fiber structure with a diameter of 1000 μm. It has ultraviolet to visible light transmission performance and a transmission band covering 200 to 1000 nm.

7. The environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics according to claim 1, characterized in that, The Y-type fused silica fiber (12) adopts an encapsulation structure, has a diameter of 1000μm, and has ultraviolet to visible light transmission performance, with a transmission band covering 200~1000nm.

8. The environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics according to claim 1, characterized in that, The vacuum fiber feed flange (10), the fused silica fiber (11), and the Y-type fused silica fiber (12) all use SMA905 standard interfaces at both ends; The fused silica fiber (11) is connected to the arc spectral lens (9) via an SMA905 standard interface, and the end face of the fused silica fiber (11) is located at the focal length of the arc spectral lens (9).

9. The environmentally friendly insulating gas circuit breaker testing device based on spectral diagnostics according to claim 1, characterized in that, The spectrometer acquires wavelengths in the range of 200–1000 nm, has a spectral resolution better than 0.1 nm, and a minimum integration time of 1 ms.

10. A test method for environmentally friendly insulating gas circuit breakers based on spectral diagnostics, applied to the test apparatus for environmentally friendly insulating gas circuit breakers based on spectral diagnostics as described in any one of claims 1-9, characterized in that, The method includes: Test gas (S1) is a binary or ternary environmentally friendly insulating mixture of gases, which is then filled into the test chamber. Test circuit (S2), a high-voltage test circuit is set up; Spectral acquisition (S3): Construct a spectral acquisition optical path to record the dynamic spectrum of the moving contact nozzle throat and downstream position; Spectral diagnostics (S4) utilizes spectral line intensity ratio, spectral line broadening, and radiative transport model methods to invert electron density, particle concentration distribution, degree of ionization, conductivity, and temperature parameters. Combined with different gas ratios and pressure conditions, the evolution of arc plasma is analyzed.

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