Sulfur hexafluoride decomposition product complementary sensor array detection apparatus and method

Abstract

Disclosed is a sulfur hexafluoride decomposition product complementary sensing array detection device and method, the sulfur hexafluoride decomposition product complementary sensing array detection device comprising a single-hole closed loop connected with a sulfur hexafluoride storage chamber, the single-hole closed loop having the functions of normal-pressure gas taking, complementary sensing array trace characteristic gas rapid detection and measured gas circulation and charging; the device further comprises a vacuum auxiliary bypass and a self-calibration auxiliary bypass, which, in cooperation with the single-hole closed loop, have the functions of complementary sensing array signal self-calibration and sulfur hexafluoride storage chamber pressure self-compensation, improving the accuracy and long-term stability of the detection device. The device uses complementary sensing array rapid detection to replace the traditional chromatographic carrier gas sampling, and runs the vacuum pumping, circulation detection and charging and self-calibration processes, so that the gas insulated switchgear can be detected in the whole life cycle, miniaturization, large batch, low power consumption and environmental friendliness.

Description

Technical Field

[0001] The present invention belongs to the technical field of sulfur hexafluoride decomposition products, and in particular to a complementary sensing array detection device and method for sulfur hexafluoride decomposition products. Background Art

[0002] Sulfur hexafluoride (SF6) is the preferred insulating medium for high-voltage insulation equipment in power systems. Due to its excellent insulation and arc-extinguishing properties, it is widely used in high-voltage gas-insulated switchgear (GIS). GIS equipment inevitably develops defects during long-term operation, leading to abnormal discharge phenomena such as metal particle discharge and tip discharge. If discharge faults are not detected promptly, equipment breakdown is likely to occur, leading to large-scale power outages, seriously threatening social order and the health and safety of the people. A full-lifecycle health monitoring and fault diagnosis method for GIS is urgently needed. The easy ionization and decomposition of pure SF6 under the action of an electric arc provides an important basis for diagnosis. The decomposition products react with oxygen and moisture in the equipment to produce substances such as sulfur dioxide, hydrogen sulfide, and carbon monoxide. By monitoring the concentration of the decomposition products and combining them with relevant intelligent algorithms, the fault type and severity can be determined.

[0003] Currently, GIS equipment testing primarily relies on offline chromatographic analysis, which fails to provide real-time testing throughout its lifecycle and hinders accurate identification of equipment defects. Chromatographs are expensive and power-hungry, while auxiliary testing equipment is complex and unreliable. The testing process is cumbersome, hindering both mass testing and field deployment. Long-term offline gas sampling and chromatographic analysis can reduce equipment pressure, impacting the normal operation of GIS equipment. Furthermore, decomposition products emitted during testing pose a serious threat to the health and safety of operators, contradicting the emerging concept of green, low-carbon, and sustainable development.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0005] In response to the problems existing in the prior art, the present invention proposes a complementary sensor array detection device and method for sulfur hexafluoride decomposition products, which realizes full life cycle, large-scale, miniaturized, low-power and environmentally friendly detection.

[0006] The object of the present invention is achieved through the following technical solutions: a complementary sensor array detection device for sulfur hexafluoride decomposition products comprises:

[0007] GIS air chamber;

[0008] A first manual valve connected to the GIS air chamber to manually open and close it;

[0009] A single-hole closed loop configured for normal pressure gas intake, measured gas detection, and recycling back to charge, the single-hole closed loop comprising,

[0010] A first solenoid valve having one end connected to the first manual valve;

[0011] An electronic pressure controller having one end connected to the first solenoid valve and another end;

[0012] A complementary sensor array detection chamber connected to the other end of the electronic pressure controller, the complementary sensor array detection chamber comprising,

[0013] A complementary sensor array unit comprising a plurality of sensors each detecting a single gas of the decomposition products of sulfur hexafluoride;

[0014] A processing unit connected to the complementary sensor array unit to decouple cross-interference of the complementary sensor array unit and identify the concentration of the single gas of the decomposition products;

[0015] A pressure gauge P1 disposed between the complementary sensor array detection chamber and the electronic pressure controller to measure first pressure data;

[0016] A second solenoid valve having one end connected to the other end of the complementary sensor array detection chamber;

[0017] A booster pump having one end connected to the other end of the second solenoid valve;

[0018] A check valve having one end connected to the other end of the booster pump;

[0019] A third solenoid valve having one end connected to the other end of the check valve and another end connected between the first manual valve and the one end of the first solenoid valve;

[0020] A pressure gauge P2 disposed between the check valve and the third solenoid valve to measure second pressure data;

[0021] A vacuum auxiliary loop comprising,

[0022] A second manual valve having one end connected between the first manual valve and the one end of the first solenoid valve;

[0023] A vacuum pump connected to the other end of the second manual valve;

[0024] A calibration auxiliary bypass comprising,

[0025] A fourth solenoid valve having one end connected between the electronic pressure controller and the first solenoid valve;

[0026] A sulfur hexafluoride standard gas cylinder connected to the other end of the fourth solenoid valve.

[0027] The complementary sensor array unit of the sulfur hexafluoride decomposition product complementary sensing array detection device includes three MEMS thin film compatible and noble metal doped metal oxide gas sensors for detecting sulfur dioxide, hydrogen sulfide and carbon monoxide respectively.

[0028] The complementary sensor array unit of the sulfur hexafluoride decomposition product complementary sensing array detection device includes four metal oxide gas sensors for detecting sulfur dioxide, hydrogen sulfide, carbon monoxide and micro water respectively.

[0029] The metal oxide gas sensor of the sulfur hexafluoride decomposition product complementary sensing array detection device is based on MEMS thin film compatibility and noble metal doping.

[0030] The noble metal doping design of the sulfur hexafluoride decomposition product complementary sensing array detection device is based on density functional calculation of the electronic properties of each decomposition product to form a complementary characteristic, and each decomposition product corresponds to an optimal sensor array unit.

[0031] The sulfur hexafluoride decomposition product complementary sensing array detection device,

[0032] A data set of the response of each array unit to a random target mixed gas is constructed, the Kendall correlation coefficient of the response of each unit of the complementary array to the gas component concentration is calculated, and a gas species identification training is carried out in combination with a machine learning extremely random tree model to evaluate the selected array based on the feature score of the trained model.

[0033] The sulfur hexafluoride decomposition product complementary sensing array detection device,

[0034] The evaluation method comprises the following steps:

[0035] Step 1) Collect the response of each array unit to a random concentration target mixed gas continuously for 24 hours in the same time and space, and obtain the response data set after cleaning the abnormal data;

[0036] Step 2) Calculate the Kendall correlation coefficient of each array unit and the target gas carbon monoxide, hydrogen sulfide and sulfur dioxide based on the response data set, and the Kendall coefficient of the unique gas is the largest, then the array unit can be evaluated to have a complementary characteristic;

[0037] Step 3) Set the target gas species identification y in the data set, wherein the value of y is 0-7, which corresponds to eight combinations of three target gas species respectively, combine the evaluation result of step 2), carry out target gas species classification training based on the extremely random tree model, separate each node based on the response threshold of the array unit, define the normalized feature score by calculating the number of times each array unit appears in the decision tree and the reduction of classification impurity, and the higher the feature score, the higher the effectiveness of the array unit, and the optimal sensor array unit is constructed based on the comprehensive evaluation result.

[0038] The processing unit of the complementary sensor array detection device for sulfur hexafluoride decomposition products comprises an embedded system carrying a lightweight convolutional neural network, which inherits an interleaved group convolutional neural network and combines a multi-task joint loss to decouple gas concentration and type.

[0039] In the complementary sensor array detection device for sulfur hexafluoride decomposition products, the booster pump is a diaphragm pump to simultaneously realize the backfilling of the measured gas and the preparation of the circulating detection vacuum.

[0040] The detection method of the complementary sensor array detection device for sulfur hexafluoride decomposition products comprises the following steps,

[0041] Step 1), close the first manual valve, the second manual valve, the first to fourth electromagnetic valves, open the second manual valve and the first electromagnetic valve, the electronic pressure controller is always on, start the vacuum pump, when the pressure gauge P1 reaches the first set value, close the first electromagnetic valve, open the third electromagnetic valve, when the pressure gauge P2 reaches the second set value, close the third electromagnetic valve, close the second manual valve and the vacuum pump;

[0042] Step 2), open the first manual valve and the first electromagnetic valve, set the electronic pressure controller outlet to constant pressure, after the pressure gauge P1 shows a stable number, detect the complementary sensor array detection chamber under constant pressure;

[0043] Step 3), after the detection and analysis are completed, close the first electromagnetic valve, open the second electromagnetic valve and the third electromagnetic valve, read the pressure gauge P2 number, start the booster pump, and the complementary array detection chamber gas is pressurized and filled into the GIS gas chamber;

[0044] Step 4), when the pressure gauge P1 reaches the third set value, close the booster pump, close the first manual valve, the second manual valve, the first to fourth electromagnetic valves;

[0045] Step 5), when the device is continuously detected, determine whether the pressure gauge P1 reaches the third set value, after reaching the third set value, repeat steps 2) to 4).

[0046] In the detection method, the third set value is greater than the first set value.

[0047] In the detection method, the first set value is 10 mbar, and the third set value is 100 mbar.

[0048] The self-calibration method of the complementary sensor array detection device for sulfur hexafluoride decomposition products comprises the following steps,

[0049] Step 1), when the device is first operated, the pressure gauge P1 reaches the first set value and the pressure gauge P2 reaches the second set value, close the first manual valve, the second manual valve, the first to fourth electromagnetic valves and the device;

[0050] Step 2) open the fourth electromagnetic valve, the gas in the sulfur hexafluoride standard gas cylinder enters the single-hole closed loop, the outlet of the electronic pressure controller is set to normal pressure, and the pressure gauge P1 is stable. The complementary sensor array detects the calibration drift under normal pressure in the detection chamber.

[0051] Step 3) after the calibration is completed, the fourth electromagnetic valve is closed, the second electromagnetic valve, the third electromagnetic valve and the first manual valve are opened, the pressure gauge P2 is recorded, the booster pump is opened, and the gas in the complementary array detection chamber is pressurized into the GIS gas chamber.

[0052] Step 4) when the pressure gauge P1 meets the third set value, the booster pump and all valves are closed.

[0053] Step 5) if the pressure gauge P2 shows a value lower than the normal working value of the GIS gas chamber, the self-calibration steps 2) to 4) are cycled until the normal working value of the GIS gas chamber is reached.

[0054] In the self-calibration method, the cyclic self-calibration includes zero point drift calibration of the detection signal and self-compensation of the GIS gas chamber pressure.

[0055] In the self-calibration method, the third set value is ten times the first set value.

[0056] Compared with the prior art, the complementary sensor array of the present application has the advantages of fast detection speed, simple operation, miniaturization, low power consumption and high reliability. The cyclic detection and recharging replace the traditional offline sampling detection device, which can realize the whole life cycle monitoring of the equipment, improve the detection efficiency, greatly reduce the emission of sulfur hexafluoride and its decomposition products, and respond to the new concept of green low-carbon sustainable development. The self-calibration solves the problem of poor long-term stability of the metal oxide sensor, and the pure sulfur hexafluoride in the self-calibration process simultaneously compensates the GIS device pressure, realizes zero emission during the whole detection period, and realizes the cooperation of the accurate sensor signal and pressure compensation. BRIEF DESCRIPTION OF DRAWINGS

[0057] Various other advantages and benefits of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included solely for purposes of illustrating the preferred embodiments and are not to be construed as a limitation of the present application. It should be readily understood that the drawings depicted are only some embodiments of the present application and that any other drawings, which would become obvious to those of ordinary skill in the art upon reading the present description, can be derived from these drawings without paying creative thought. Moreover, the same reference numbers in the entire drawings represent the same components.

[0058] In the drawings:

[0059] Figure 1is a structural schematic diagram of a sulfur hexafluoride decomposition product complementary sensing array detection device according to an embodiment of the present application.

[0060] The present application will be further explained with reference to the accompanying drawings and examples. DETAILED DESCRIPTION

[0061] The specific embodiments of the present application will be described below in detail with reference to the accompanying drawings. Although specific embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided so that the present application can be more thoroughly understood and so that the scope of the present application can be fully conveyed to those skilled in the art.

[0062] It should be noted that certain terms are used throughout the present specification and claims which have particular meanings as set forth below. Those skilled in the art will understand that the component parts described herein can be referred to by different names in different documents and that the names given herein are used merely for convenience and are not intended to convey any meaning other than that set forth below. The present specification and claims are not to be limited by the names given herein. As used throughout this specification and in the claims, the words "comprise" and "include" and variations such as "comprises", "comprising", "includes" and "including" are to be construed in an open, non- limiting sense, in that they are used to indicate the inclusion of a non-exclusive list of integers or components that it follows, but not to the exclusion of any other non- specifically recited integers or components. The description of preferred embodiments of the application is given as examples only and without any intention to limit the scope of the application, which is defined by the claims. The scope of the protection of the application is set out in the claims that follow.

[0063] For the purpose of promoting an understanding of the principles of the application, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will, nevertheless, be understood that no limitation of the scope of the application is intended by this disclosure. Alterations, modifications, and improvements to the disclosed embodiments are intended to be part of the scope of the application. The various embodiments of the present application will be described in greater detail below.

[0064] For a better understanding, in one embodiment, as shown in Figure 1 a sulfur hexafluoride decomposition product complementary sensing array detection device includes,

[0065] a GIS gas chamber 1;

[0066] a first manual valve 2 connected to the GIS gas chamber 1 to manually turn on and off the GIS gas chamber 1;

[0067] a single-hole closed loop configured to take gas at normal pressure, detect the measured gas, and recycle back to charge, the single-hole closed loop including,

[0068] a first electromagnetic valve 3 connected to one end of the first manual valve 2;

[0069] an electronic pressure controller 4 connected to the other end of the first electromagnetic valve 3;

[0070] a complementary sensor array detection chamber 6 connected to the other end of the electronic pressure controller 4, the complementary sensor array detection chamber 6 comprising,

[0071] a complementary sensor array unit comprising a plurality of sensors for detecting each single gas of the decomposition products of sulfur hexafluoride respectively;

[0072] a processing unit connected to the complementary sensor array unit for decoupling cross-interference of the complementary sensor array unit and identifying the concentration of each single gas of the decomposition products;

[0073] a pressure gauge P1 5 disposed between the complementary sensor array detection chamber 6 and the electronic pressure controller 4 for measuring first pressure data;

[0074] a second solenoid valve 7 connected to the other end of the complementary sensor array detection chamber 6;

[0075] a booster pump 8 connected to the other end of the second solenoid valve 7;

[0076] a check valve 9 connected to the other end of the booster pump 8;

[0077] a third solenoid valve 11 connected to the other end of the check valve 9 and to the first manual valve 2 and to one end of the first solenoid valve 3;

[0078] a pressure gauge P2 10 disposed between the check valve 9 and the third solenoid valve 11 for measuring second pressure data;

[0079] a vacuum auxiliary circuit comprising,

[0080] a second manual valve 12 connected to the first manual valve 2 and to one end of the first solenoid valve 3;

[0081] a vacuum pump 13 connected to the other end of the second manual valve 12;

[0082] a calibration auxiliary bypass comprising,

[0083] a fourth solenoid valve 14 connected to the electronic pressure controller 4 and to the first solenoid valve 3;

[0084] a sulfur hexafluoride standard gas cylinder 15 connected to the other end of the fourth solenoid valve 14.

[0085] In the preferred embodiment of the complementary sensor array detection device for the decomposition products of sulfur hexafluoride, the complementary sensor array unit comprises four metal oxide gas sensors for detecting sulfur dioxide, hydrogen sulfide, carbon monoxide and water vapor respectively.

[0086] In a preferred embodiment of the complementary sensing array detection device for sulfur hexafluoride decomposition products, the metal oxide gas sensor is based on a MEMS film compatible with noble metal doping.

[0087] In a preferred embodiment of the complementary sensor array detection device for sulfur hexafluoride decomposition products, the noble metal doping design is based on density functional calculation of the complementary characteristics of the electronic properties of each decomposition product, and each decomposition product uniquely corresponds to an optimal sensor array unit.

[0088] In a preferred embodiment of the complementary sensor array detection device for sulfur hexafluoride decomposition products, the optimal sensor array units are further evaluated by generating a dataset of each unit's responses to a random target gas mixture. The Kendall correlation coefficient for each unit and the feature score of a machine learning extreme random tree are calculated for each unit. The two evaluations are then combined to construct a complementary array. The Kendall correlation coefficients of the responses of each unit in the complementary array and the gas component concentrations are calculated, and the Kendall correlation coefficients are used to assess complementarity and consistency. Gas type recognition training is then performed in conjunction with a machine learning extreme random tree model, and the feature scores of the trained model are used to evaluate the effectiveness of the selected array.

[0089] The complementary array evaluation comprises the following steps,

[0090] Step 1) Continuously collect responses of each array unit to a random concentration target gas mixture at the same time and space for 24 hours, and clean the abnormal data to obtain a response data set;

[0091] Step 2) Based on the response data set, the Kendall correlation coefficients between each array unit and the target gases carbon monoxide, hydrogen sulfide, and sulfur dioxide are calculated. If the Kendall coefficients of the same type of sensor for the target gas concentrations vary slightly, it can be assessed that the MEMS film-compatible array units have high consistency. If the Kendall coefficients of different types of sensors for the target gas concentrations vary significantly, and if they both have the largest Kendall coefficient for a single gas, it can be assessed that the array units have complementary characteristics.

[0092] Step 3) Add the target gas type identifier y in the data set, where the y value ranges from 0 to 7 corresponding to eight combinations of three target gas types. Combined with the evaluation results of step 2), target gas type classification training is carried out based on the extremely random tree model. Each node is separated based on the response threshold of the array unit. The normalized feature score is defined by calculating the number of times each array unit appears in the decision tree and the reduction in classification impurity. The higher the feature score, the higher the effectiveness of the array unit. The optimal complementary array is constructed based on the evaluation results.

[0093] In the preferred embodiment of the complementary sensor array detection device for sulfur hexafluoride decomposition products, the processing unit comprises an embedded system carrying a lightweight convolutional neural network, which inherits the interleaved group convolutional neural network and combines the multi-task joint loss to decouple the gas concentration and type.

[0094] In the preferred embodiment of the complementary sensor array detection device for sulfur hexafluoride decomposition products, the booster pump 8 is a diaphragm pump to simultaneously realize the backfilling of the measured gas and the preparation of the circulating detection vacuum.

[0095] In one embodiment, the complementary sensor array unit is composed of four thin film compatible and noble metal doped metal oxide gas sensors. This implementation is for sulfur hexafluoride decomposition products such as hydrogen sulfide, sulfur dioxide, and carbon monoxide. However, the complementary array construction method is not limited to this and can be extended to more MEMS thin film compatible sensing arrays. The core is the embodiment of its complementary characteristics. Although metal oxide sensors are not specific sensors, they can be designed to have high selectivity for each single gas and make full use of their cross-sensitivity characteristics to identify mixed gases. The specific design ideas include: designing a complementary array based on the density functional calculation of the adsorption energy, adsorption distance, and charge transfer properties of the gas-sensitive unit for the target gas; combining MEMS micro-nano processing technology to produce a complementary gas-sensitive element; further evaluating the sensor array unit to generate a random target mixed gas response data set, calculate the Kendall correlation coefficient of each unit, and calculate the feature score of the machine learning extreme random tree, and integrate the two evaluations to construct a complementary array; the array fusion intelligent sensing algorithm is carried by an embedded system with a lightweight convolutional neural network, which is obtained by interleaved group convolutional neural network through knowledge distillation technology. The cross-interference of the sensor array is realized by training the interleaved convolution kernel to automatically fuse the data. Through the multi-task joint loss mechanism, the gas concentration and type are decoupled, and the concentration of sulfur hexafluoride and its decomposition products is identified.

[0096] In summary, the complementary sensor array detection device for sulfur hexafluoride decomposition products based on thin film compatible metal oxide sensors can realize the rapid detection of sulfur hexafluoride and its decomposition products, and can replace the existing offline chromatography gas detection device. The present invention has the advantages of fast detection speed, simple operation, miniaturization, low power consumption, and high reliability. The circulating detection backfilling device can realize the whole life cycle monitoring of the equipment, improve the detection efficiency, and greatly reduce the emission of sulfur hexafluoride and its decomposition products, in response to the new concept of green and low-carbon sustainable development. The self-calibration device solves the problem of poor long-term stability of metal oxide sensors, and simultaneously compensates the GIS device pressure during the self-calibration process, realizing zero emission and the cooperation of accurate sensing signal and pressure compensation during the whole detection period.

[0097] In one embodiment, the self-calibration simultaneously completes the calibration function of the complementary sensing array detection chamber 6 and the pressure compensation function of the GIS gas chamber 1.

[0098] In one embodiment, the vacuum and the cycle detection backfilling have different vacuum degrees set by the pressure gauge P1 5, and the booster pump 8 used for the backfilling of the measured gas is a diaphragm pump, which simultaneously realizes the backfilling of the measured gas and the cycle detection vacuum preparation. The vacuum and the cycle detection backfilling have different detection objects, the vacuum detection detects the closed loop pressure, and the cycle detection backfilling detects the sulfur hexafluoride storage chamber pressure.

[0099] In one embodiment, the complementary sensing array detection device for the decomposition products of sulfur hexafluoride comprises a single-hole closed loop and two auxiliary bypasses, and is sequentially composed of the first electromagnetic valve 3, the electronic pressure controller 4, the pressure gauge P1 5, the complementary sensing array detection chamber 6, the second electromagnetic valve 7, the booster pump 8, the one-way valve 9, the pressure gauge P2 10, and the third electromagnetic valve 11. The vacuum auxiliary loop is sequentially composed of the second manual valve 12 and the vacuum pump 13. The calibration auxiliary bypass is sequentially composed of the fourth electromagnetic valve 14 and the sulfur hexafluoride standard gas cylinder 15. The single-hole closed loop is connected to the GIS gas chamber 1 through the first manual valve 2, and is connected to point A with the vacuum auxiliary bypass and the calibration auxiliary bypass connected to point B with the single-hole closed loop.

[0100] The detection method of the complementary sensing array detection device for the decomposition products of sulfur hexafluoride comprises the following steps,

[0101] Step 1), close the first manual valve 2, the second manual valve 12, and the first to fourth electromagnetic valves 14, open the second manual valve 12 and the first electromagnetic valve 3, the electronic pressure controller 4 is always open, open the vacuum pump 13, when the pressure gauge P1 5 reaches the first set value, close the first electromagnetic valve 3, open the third electromagnetic valve 11, when the pressure gauge P2 10 reaches the second set value, close the third electromagnetic valve 11, and close the second manual valve 12 and the vacuum pump 13.

[0102] Step 2), open the first manual valve 2 and the first electromagnetic valve 3, set the electronic pressure controller 4 outlet to normal pressure, when the pressure gauge P1 5 shows a stable number, the complementary sensing array detection chamber 6 detects at normal pressure.

[0103] Step 3), after the detection and analysis are completed, close the first electromagnetic valve 3, open the second electromagnetic valve 7 and the third electromagnetic valve 11, read the number shown by the pressure gauge P2 10, open the booster pump 8, and the complementary array detection chamber gas is boosted to charge into the GIS gas chamber 1.

[0104] Step 4), when the pressure gauge P1 5 reaches the first set value, close the booster pump 8, and close the first manual valve 2, the second manual valve 12, and the first to fourth electromagnetic valves 14.

[0105] Step 5, the device continuously detects whether the pressure gauge P1 5 reaches the third set value, after reaching the third set value, repeating steps 2-4 until the complementary sensing array output is stable; if the third set value is not reached, step 1 is executed.

[0106] In a preferred embodiment of the detection method, the third set value is greater than the first set value.

[0107] In a preferred embodiment of the detection method, the first set value is 10 mbar, and the third set value is 100 mbar. The first set value of 10 mbar is the set requirement in the first detection, which considers that the initial circuit impurity gas has the least impact on the operation of the GIS device. If impurity gas such as water molecules enters the GIS gas chamber from the circuit, it will cause serious consequences. The third set value of 100 mbar is the set requirement in continuous detection, which considers that the residual target gas in the last detection does not affect the accuracy of this detection, while taking into account the complexity of the gas circuit structure and the detection efficiency, and improving the utilization rate of the diaphragm pump.

[0108] In one embodiment, the vacuum pumping includes the following steps:

[0109] 1) Before the device is first operated, the circuit should meet a higher vacuum degree to reduce environmental gas interference, and all manual valves and electromagnetic valves are closed;

[0110] 2) The second manual valve 12 and the first electromagnetic valve 3 are opened, the electronic pressure controller 4 is always on, and the vacuum pump 13 is started;

[0111] 3) When the pressure gauge P1 5 reaches the first set value, such as absolute pressure 10 mbar, the first electromagnetic valve 3 is closed and the third electromagnetic valve 11 is opened;

[0112] 4) When the pressure gauge P2 10 reaches the second set value, such as absolute pressure 10 mbar, the third electromagnetic valve 11 is closed, the second manual valve 12 is closed, and the vacuum pump 13 is closed;

[0113] In one embodiment, the detection backfilling includes the following steps:

[0114] 1) When the device is first operated, the pressure gauges P1 5 and P2 10 respectively reach the first and second set values, for example, absolute pressure 10 mbar, and all valves and devices are closed;

[0115] 2) The first manual valve 2 and the first electromagnetic valve 3 are opened, the outlet of the electronic pressure controller 4 is set to normal pressure, the pressure gauge P1 5 shows stable, and the complementary sensing array detection chamber 6 detects under normal pressure;

[0116] 3) After the analysis is completed, the first electromagnetic valve 3 is closed, the third electromagnetic valve 11 and the second electromagnetic valve 7 are opened, the pressure gauge P2 10 is read, the booster pump 8 is opened, and the gas in the complementary array detection chamber 6 is boosted to fill the GIS gas chamber 1;

[0117] 4) When the pressure gauge P1 5 reaches the third set value, such as 100 mbar of absolute pressure, the booster pump 8 is closed, and all valves are closed.

[0118] 5) When the device is continuously detected, it is determined whether the pressure gauge P1 5 reaches the third set value, such as 100 mbar of absolute pressure, and the detection cycle is repeated.

[0119] The self-calibration method of the complementary sensing array detection device for sulfur hexafluoride decomposition products includes the following steps,

[0120] Step 1) When the device is first operated, the pressure gauge P1 5 reaches the first set value, and the pressure gauge P2 10 reaches the second set value. The first manual valve 2, the second manual valve 12, the first to fourth electromagnetic valves 14, and the device are closed.

[0121] Step 2) The fourth electromagnetic valve 14 is opened, the gas in the sulfur hexafluoride standard gas cylinder 15 enters the single-hole closed loop, the outlet of the electronic pressure controller 4 is set to normal pressure, and the pressure gauge P1 5 is stable. The complementary sensing array detection chamber 6 is calibrated under normal pressure.

[0122] Step 3) After calibration is completed, the fourth electromagnetic valve 14 is closed, the second electromagnetic valve 7, the third electromagnetic valve 11, and the first manual valve 2 are opened, the pressure gauge P2 10 is recorded, the booster pump 8 is opened, and the gas in the complementary array detection chamber is boosted to enter the GIS gas chamber 1.

[0123] Step 4) Until the pressure gauge P1 5 meets the third set value, the booster pump 8 and all valves are closed. If P1 5 does not meet the third set value, check the loop sealing problem.

[0124] Step 5) If the pressure gauge P2 10 reading is lower than the normal working value of the GIS gas chamber 1, the self-calibration steps 2) to 4) are cycled until the normal working value of the GIS gas chamber 1 is reached.

[0125] In a preferred embodiment of the self-calibration method, the third set value is ten times the first set value. The first set value of 10 mbar is a set requirement in the first detection, which considers that the influence of impurity gas in the initial loop on the operation of the GIS device is minimal. If impurity gas such as water molecules enters the GIS gas chamber from the loop, it will cause serious consequences. The third set value of 100 mbar is a set requirement in continuous detection, which considers that the residual target gas in the last detection does not affect the accuracy of this detection, while taking into account the complexity of the gas path structure and the detection efficiency, and improving the utilization rate of the diaphragm pump.

[0126] In one embodiment, the self-calibration comprises the following steps:

[0127] 1) When the device is first operated, the pressure gauges P1 5 and P2 10 reach the first and second set values (10 mbar absolute pressure), all valves and devices are closed;

[0128] 2) The fourth electromagnetic valve 14 is opened, the gas in the sulfur hexafluoride standard gas cylinder 15 enters the circuit, the outlet of the electronic pressure controller 4 is set to normal pressure, and when the pressure gauge P1 5 shows a stable number, the complementary sensor array detects the calibration drift at normal pressure in the detection chamber 6;

[0129] 3) After the calibration is completed, the fourth electromagnetic valve 14 is closed, the second electromagnetic valve 7, the third electromagnetic valve 11, and the first manual valve 2 are opened, the pressure gauge P2 10 is recorded, the booster pump 8 is opened, and the gas in the complementary array detection chamber 6 is pressurized to enter the GIS gas chamber 1;

[0130] 4) When the pressure gauge P1 5 meets the requirement of 100 mbar absolute pressure, the booster pump 8 is closed, and all valves are closed;

[0131] 5) If the pressure gauge P2 10 shows a number lower than the normal working value of the GIS device, the self-calibration steps 2-4) are cycled until the normal working pressure is reached;

[0132] Although the embodiments of the present application are described above in combination with the drawings, the present application is not limited to the above specific embodiments and application fields, and the above specific embodiments are only illustrative and guiding, but not limiting. Those skilled in the art can make many forms under the guidance of the present specification and without departing from the scope protected by the claims of the present application, which are all included in the protection of the present application.

Claims

1. A complementary sensor array detection device for sulfur hexafluoride decomposition products, characterized in that: These include, GIS air chamber; A first manual valve connected to the GIS air chamber to manually open and close it; A single-hole closed loop is configured to take gas at normal pressure, detect the gas being measured, and refill the gas in a cycle. The single-hole closed loop includes: a first solenoid valve, one end of which is connected to the first manual valve; an electronic pressure controller, one end of which is connected to the other end of the first solenoid valve; A complementary sensing array detection chamber connected to the other end of the electronic pressure controller, the complementary sensing array detection chamber comprising: A complementary sensor array unit comprising a plurality of sensors for respectively detecting individual gases of sulfur hexafluoride decomposition products; a processing unit connected to the complementary sensor array units to decouple cross-interference of the complementary sensor array units and identify the concentration of each single gas of the decomposition product; A pressure gauge P1 is provided between the complementary sensing array detection chamber and the electronic pressure controller to measure first pressure data; a second solenoid valve, one end of which is connected to the other end of the complementary sensing array detection chamber; a booster pump, one end of which is connected to the other end of the second solenoid valve; a one-way valve, one end of which is connected to the other end of the booster pump; a third solenoid valve, one end of which is connected to the other end of the one-way valve, and the other end of which is connected between the first manual valve and one end of the first solenoid valve; a pressure gauge P2, which is provided between the one-way valve and the third solenoid valve to measure a second pressure data; A vacuum assist circuit comprising: a second manual valve, one end of which is connected between the first manual valve and one end of the first solenoid valve; a vacuum pump connected to the other end of the second manual valve; Calibration auxiliary bypass, which includes, a fourth solenoid valve, one end of which is connected between the electronic pressure controller and the first solenoid valve; A sulfur hexafluoride standard gas cylinder is connected to the other end of the fourth solenoid valve. The complementary sensor array unit includes three MEMS thin film compatible and precious metal-doped metal oxide gas sensors for detecting sulfur dioxide, hydrogen sulfide, and carbon monoxide, respectively. The precious metal doping is based on density functional calculations to form complementary characteristics in the electronic properties of each decomposition product, and each decomposition product uniquely corresponds to an optimal sensor array unit. The optimal sensor array unit needs to further evaluate the sensitivity to target gas concentration and type, construct a data set of each array unit's response to random target gas mixtures, calculate the Kendall correlation coefficient between the response of each unit in the complementary array and the gas component concentration, and combine it with a machine learning extreme random tree model to perform gas type recognition training. The feature score of the training model is used to evaluate the selected array to obtain the optimal sensor array unit; The processing unit includes an embedded system equipped with a lightweight convolutional neural network, which inherits the staggered group convolutional neural network and combines multi-task joint loss to decouple gas concentration and type.

2. The complementary sensor array detection device for sulfur hexafluoride decomposition products according to claim 1, characterized in that: The booster pump is a diaphragm pump to simultaneously achieve backfilling of the gas being tested and vacuum preparation for cyclic testing.

3. The detection method of the complementary sensor array detection device for sulfur hexafluoride decomposition products according to any one of claims 1 to 2, characterized in that: It includes the following steps, Step 1) Close the first manual valve, the second manual valve, and the first to fourth solenoid valves, open the second manual valve and the first solenoid valve, keep the electronic pressure controller normally open, start the vacuum pump, and when the pressure gauge P1 reaches the first set value, close the first solenoid valve and open the third solenoid valve. When the pressure gauge P2 reaches the second set value, close the third solenoid valve, and close the second manual valve and the vacuum pump; Step 2) Open the first manual valve and the first solenoid valve, set the outlet of the electronic pressure controller to normal pressure, and when the pressure gauge P1 shows a stable reading, perform a test in the complementary sensor array detection chamber under normal pressure; Step 3) After the detection and analysis is completed, close the first solenoid valve, open the second and third solenoid valves, read the pressure gauge P2, start the booster pump, and pressurize the gas in the complementary array detection chamber into the GIS air chamber; Step 4), when the pressure gauge P1 reaches the third set value, the booster pump is turned off, and the first manual valve, the second manual valve, and the first to fourth solenoid valves are closed; Step 5) When the device continuously detects, it is determined whether the pressure gauge P1 reaches the third set value. After reaching the third set value, steps 2) to 4) are repeated.

4. The detection method according to claim 3, characterized in that The third set value is greater than the first set value, the first set value is 10 mbar, and the third set value is 100 mbar.

5. The self-calibration method for the complementary sensor array detection device for sulfur hexafluoride decomposition products according to claim 1, characterized in that: It includes the following steps, Step 1) When the device is first operated, the pressure gauge P1 reaches the first set value and the pressure gauge P2 reaches the second set value, and the first manual valve, the second manual valve, the first to fourth solenoid valves and the device are closed; Step 2) Open the fourth solenoid valve, allowing the gas in the sulfur hexafluoride standard gas cylinder to enter the single-hole closed loop. Set the outlet of the electronic pressure controller to normal pressure. Wait until the pressure gauge P1 reading stabilizes, and calibrate the drift of the complementary sensor array detection chamber under normal pressure. Step 3) After calibration is complete, close the fourth solenoid valve, open the second and third solenoid valves, and the first manual valve, record the pressure gauge P2 reading, start the booster pump, and pressurize the gas in the complementary array detection chamber into the GIS air chamber; Step 4) When the pressure gauge P1 meets the third set value, close the booster pump and all valves; Step 5) If the pressure gauge P2 reading is lower than the normal operating value of the GIS air chamber, repeat self-calibration steps 2) to 4) until the normal operating value of the GIS air chamber is reached.

6. The self-calibration method according to claim 5, characterized in that: The cyclic self-calibration includes array detection signal zero drift calibration and GIS air chamber pressure self-compensation.

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