On-line monitoring device and method for concentration of each component of free gas of gas relay

Abstract

The invention discloses an on-line monitoring device and method for the concentration of each component of free gas of a gas relay, and belongs to the field of transformer gas free gas detection. The device comprises a gas collection box, an oil storage box, a driver, a detection gas chamber and a micro-processing device. The gas collection box is connected with the gas relay, the oil storage box and the detection gas chamber through a first pipeline, a second pipeline and a third pipeline respectively, and each pipeline is provided with an electromagnetic valve to control flowing of oil and gas. The driver drives the piston in the oil storage box to move, and replacement of oil and gas is achieved. An array type sensor is arranged in the detection gas chamber and is used for detecting the concentration of each component in the free gas. The micro-processing device carries out preprocessing and logic judgment on the sensor data to realize local alarm or upload the sensor data to the cloud for further analysis. According to the method, gas collection, detection and discharge are automatically completed by controlling cooperative work of the electromagnetic valve and the driver, the detection efficiency and precision are remarkably improved, and potential safety hazards of manual detection are avoided.

Description

Technical Field

[0001] The present invention belongs to the field of detection of free gas in transformer gas, and particularly relates to an on-line monitoring device and method for the concentration of each component of free gas in a gas relay. Background Art

[0002] Power transformers are the core main equipment in the power system. When serious overload, short circuit, insulation damage and other faults occur inside the transformer, due to the insufficient sensitivity and action speed of relay protection, the development of the fault cannot be blocked in time, and intense arc discharge will occur inside the transformer. At the same time, a large amount of hydrocarbon mixed gas will be generated by the arc discharge. These gases will further cause the transformer to fail. Therefore, it is of great significance to be able to detect the component content of the hydrocarbon mixed gas generated by the discharge at an early stage.

[0003] The gas relay is an important protection device on transformer equipment. Under normal conditions, the inside of the gas relay is filled with insulating oil. When a fault occurs inside the transformer or there is a heating defect, gas will accumulate in the gas relay, triggering corresponding actions, thereby sending out a light gas warning signal. After the gas signal acts, the current traditional detection method requires testers to manually obtain the gas inside the relay through a gas collecting box, and judge the gas components by using methods such as combustion method, chromatography and chemical reagents. The traditional detection method has certain risks for testers. If a heavy gas signal occurs, there will be great personal risks for testers to approach the transformer to collect gas. On the other hand, the traditional method cannot timely monitor the concentration of each component of the free gas. Summary of the Invention

[0004] In order to solve the problem in the above-mentioned prior art that the concentration of each component of the gas cannot be detected immediately after the light gas warning, the present invention provides an on-line monitoring device and method for the concentration of each component of free gas in a gas relay, which can accurately detect the content of each component of the gas immediately, timely judge the severity of the insulation defect occurring inside the transformer, thereby further improving the transformer protection efficiency and operation and maintenance level, and reducing the probability of personal injury.

[0005] To achieve the above object, the present invention adopts the following technical means: In the first aspect of the present invention, an on-line monitoring device for the concentration of each component of free gas in a gas relay is provided, including: A gas collecting box, the inside of the gas collecting box is filled with oil, and the outer wall is provided with a first pipeline, a second pipeline and a third pipeline communicating with the inside of the gas collecting box. A first solenoid valve, a second solenoid valve and a third solenoid valve are respectively arranged on the first pipeline, the second pipeline and the third pipeline; Oil storage box, a sealed cavity is arranged inside the oil storage box, one end of the cavity is provided with a piston, and the piston is connected to the telescopic end of the driver, which is used to drive the piston to move to achieve the suction function; Detection gas chamber, an array of sensors is arranged inside the detection gas chamber, a free gas inlet valve and an air outlet are arranged on the detection gas chamber, and the free gas inlet valve is communicated with the third pipeline through the first air duct; Among them, when the device is running, by controlling the on-off states of the first solenoid valve, the second solenoid valve and the third solenoid valve, as well as the movement of the driver, the free gas in the gas relay is collected into the gas collection box and further introduced into the detection gas chamber for detection by the array of sensors, so as to obtain the concentration of each component of the free gas.

[0006] Furthermore, an air inlet valve is also arranged on the detection gas chamber, and the air inlet valve is communicated with an air pump through the second air duct.

[0007] Furthermore, an observation window area is arranged on the gas collection box, the observation window area is the transparent outer shell of the gas collection box, and scales are arranged on the transparent outer shell for displaying the remaining amount of oil in the gas collection box.

[0008] Furthermore, it also includes a microprocessing device externally mounted on the wall of the detection gas chamber; The microprocessing device includes a data processing module and a data transmission module. The array of sensors is electrically connected to the data processing module, and the array of sensors transmits the concentration data of each component of the free gas collected to the data processing module; the data processing module preprocesses the received concentration data, makes a logical judgment based on the preprocessed concentration data and the set threshold standard, and determines the decision output based on the result of the logical judgment; among them, the decision output includes local alarm and uploading to the cloud.

[0009] Furthermore, the array of sensors includes a temperature and humidity detection unit and a gas detection unit; the gas detection unit is used to detect each gas component in the free gas.

[0010] In the second aspect of the present invention, a method for monitoring using the above-mentioned on-line monitoring device for the concentration of each component of the free gas in the gas relay is provided, including the following steps: Open the first solenoid valve and the second solenoid valve, and at the same time close the third solenoid valve, drive the piston in the oil storage box to move outwards, slowly pump the oil in the gas collection box into the oil storage box, and under the action of the suction action and the internal oil pressure of the transformer, collect the gas in the gas relay into the gas collection box; When the oil storage box is completely filled with oil, close the first solenoid valve and the second solenoid valve, and at the same time stop the movement of the driver. At this time, the gas collection box is filled with the free gas to be detected; Open the third solenoid valve and the free gas inlet valve, and at the same time close the air inlet valve. Guide the free gas in the gas collection box into the detection gas chamber through the first gas pipe, and detect it with the array sensor to obtain the concentration of each component of the free gas.

[0011] Further, after the gas detection is completed, open the air inlet valve and start the air pump to continuously introduce air into the detection gas chamber to exhaust all the residual free gas in the detection gas chamber.

[0012] Further, the array sensor transmits the concentration data of each component of the free gas collected to the microprocessing device; the microprocessing device preprocesses the received concentration data, makes a logical judgment based on the preprocessed concentration data and the set threshold standard, and determines the decision output based on the result of the logical judgment; wherein, the decision output includes local alarm and uploading to the cloud.

[0013] Further, the microprocessing device preprocesses the received concentration data, makes a logical judgment based on the preprocessed concentration data and the threshold standard of the preset value, and determines the decision output based on the result of the logical judgment, including: Perform noise reduction and filtering processing on the concentration data collected by the array sensor, and supplement the noise-reduced concentration data according to the temperature and humidity to obtain preprocessed data; Calculate the gas ratio of each component data in the free gas according to the preprocessed data; determine the fault category and the confidence level corresponding to the fault category according to the gas ratio and the threshold standard; When the confidence level is greater than the preset percentage, the decision output is a local alarm; otherwise, upload the preprocessed data to the cloud for further analysis and judgment.

[0014] Further, uploading the preprocessed data to the cloud for further analysis and judgment specifically includes: Determine the low-confidence data in the preprocessed data, and calculate the trend characteristics according to the low-confidence data; Input the low-confidence data, trend characteristics and temperature and humidity data into the pre-trained XGBoost model, and the XGBoost model outputs the fault probability distribution; Based on the confidence level corresponding to the fault category and the fault probability distribution output by the XGBoost model, determine the final fault diagnosis result by using the weighted fusion method.

[0015] The detection device of the present invention forms a closed free gas detection space through the detection gas chamber. The gas collection box is connected to an oil storage box. Under the action of the internal oil pressure of the transformer, the gas in the gas relay is injected into the gas collection box, the oil in the gas collection box is drained into the oil storage box, and then the free gas is introduced into the detection gas chamber to obtain the component concentration of the free gas. After the gas concentration data to be detected is stable, the gas release pipeline and the air pump of the detection gas chamber are opened simultaneously to discharge the free gas in the detection gas chamber. The device of the present invention can detect the gas components immediately after the light gas warning, improve the detection efficiency, effectively avoid the errors of manual detection, and improve personal safety.

[0016] The online monitoring method of the present invention is as follows: after the light gas alarm of the gas relay, the first solenoid valve, the second solenoid valve and the driver are opened simultaneously. At this time, the driver drives the piston to move outside the oil storage box, and the oil in the gas collection box drops accordingly and gradually enters the oil storage box. At the same time, the gas also enters the gas collection box from the first pipeline. When the oil storage box is full of oil, the driver is stopped and the third solenoid valve is opened. The free gas in the collection box is transmitted to the detection gas chamber through the gas guide pipe, and the component concentrations of the free gas are detected by the array sensor, and the detection results and the gas component concentrations are obtained. Through the data transmission module in the microprocessing device, the detected gas component concentration data is uploaded to the cloud platform, and further processed and analyzed in combination with the artificial intelligence algorithm. By the component concentrations of each gas, the type of fault occurring inside the transformer is further judged, and the goal of real-time monitoring of the transformer is achieved. The present invention avoids the defects of low efficiency, long detection time, human errors in the detection process, fire hazards and potential safety hazards to human life in the on-site manual detection method.

[0017] This solution realizes automatic gas replacement through the driver-oil storage box collaborative oil pumping and injection system, and greatly shortens the detection cycle. The array sensor detects 6 key gases ( ), as well as data such as temperature and humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The schematic diagrams in the specification, which form a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is a schematic structural diagram of an on-line monitoring device for the component concentrations of free gas in a gas relay according to an embodiment of the present invention; Figure 2 is a structural diagram of the microprocessing device in the embodiment of the present invention.

[0019] Wherein: 1. Gas collecting box; 11. First pipeline; 12. First solenoid valve; 13. Second pipeline; 14. Second solenoid valve; 15. Third pipeline; 16. Third solenoid valve; 2. Oil storage box; 3. Driver; 4. Base plate; 5. Detection gas chamber; 51. Array sensor; 52. First gas guide pipe; 53. Free gas inlet valve; 54. Second gas guide pipe; 55. Air inlet valve; 56. Air pump; 57. Air outlet; 6. Microprocessing device; 61. Data processing module; 62. Data transmission module. Detailed implementation manners

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0021] The following detailed descriptions are all exemplary descriptions, aiming to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms adopted by the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. The terms used in the present invention are only for the purpose of describing specific implementation manners, and are not intended to limit the exemplary implementation manners of the present invention.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] Embodiment 1 The gas box is an important accessory in the gas relay. It is installed in the middle and lower part of the transformer and connected to the gas relay with a very thin copper tube. Usually, the gas box is filled with transformer oil. After the gas relay alarms, open the gas box oil drain plug to drain the oil in the gas box. Under the action of the transformer oil pressure, the free gas in the gas relay enters the gas box along the soft copper tube. When the gas volume in the gas box no longer increases, it means that all the gas in the gas relay has entered the gas box, and close the oil drain plug. Then open the exhaust plug of the gas box to extract the free gas, which can realize gas collection without powering off the transformer.

[0025] At present, there are three main methods after the light gas alarm: combustion method, chromatography method and chemical reagent method. The first method is the gas collection and ignition method. Since there are many types of combustible gases in the transformer gas, the ignition test can only determine whether there is combustible gas, but cannot determine the type of gas. On the other hand, its reliability is not high, and there are great safety hazards during on-site operation; the second method is to collect the gas by artificial gas extraction, and then use a chromatograph to detect the concentration of gas components. Most transformers are located in remote areas, and it takes at least 2 hours for oil chromatograph analysts to arrive at the site. The oil sample analysis process is time-consuming and cannot timely reflect the type of fault occurring inside the transformer; the third method is the method of chemical reagent and gas reaction, which can reflect the gas composition of the transformer through chemical reaction changes. Although it is convenient and the detection time is short, it can only determine the type of gas components, and cannot accurately analyze the content of each gas component, and cannot distinguish the severity of the insulation defects occurring inside the transformer.

[0026] The embodiment of the present invention aims to solve the existing defects of low efficiency and long detection time of on-site manual detection after the gas relay gives a light gas alarm, human errors and fire hazards in the detection process, and personal safety hazards of on-site manual gas extraction. The oil in the gas collecting box is pumped into the oil storage box by controlling the driver, so that free gas is obtained in the detection gas chamber, the AD conversion circuit optimizes the signal, and the data is transmitted to the cloud platform through the data transmission circuit.

[0027] The detection gas chamber is placed in stainless steel, and the microprocessor is hung on the wall of the detection gas chamber. It is not easily affected by the external physical environment and has the advantages of small size, low cost, and easy assembly. It can meet the real-time monitoring of free gas in transformers and gas relays.

[0028] See also Figure 1, An on-line monitoring device for the concentration of each component of the free gas in a gas relay, comprising a gas collection box 1, a first pipeline 11, a first solenoid valve 12, a second pipeline 13, a second solenoid valve 14, a third pipeline 15, a third solenoid valve 16, an oil storage box 2, a driver 3, a bottom plate 4, a detection gas chamber 5, an array sensor 51, a first gas guide pipe 52, a free gas inlet valve 53, a second gas guide pipe 54, an air inlet valve 55, an air pump 56 and an air outlet 57.

[0029] Both the oil storage box 2 and the driver 3 are fixedly installed on the bottom plate 4.

[0030] The gas collection box 1 is filled with transformer oil, and the outer wall thereof is provided with a first pipeline 11, a second pipeline 13 and a third pipeline 15 communicating with the inside of the gas collection box 1. A first solenoid valve 12, a second solenoid valve 14 and a third solenoid valve 16 are respectively arranged on the first pipeline 11, the second pipeline 13 and the third pipeline 15. Oil and free gas can be introduced into other parts of the device through the above pipelines. Among them, the first pipeline 11, the second pipeline 13 and the third pipeline 15 are all controlled by solenoid valves, which have the advantages of short response time, simple structure, low price, ability to perform remote control and low power consumption, meeting the requirements of the environmental conditions of this device.

[0031] Specifically, the first pipeline 11 is connected to the exhaust of the gas relay, and the first solenoid valve 12 is used to control the on-off of the first pipeline 11. The second pipeline 13 is connected to the oil storage box 2, and the second solenoid valve 14 is used to control the on-off of the second pipeline 13.

[0032] Specifically, a sealed cavity is arranged in the oil storage box 2, and a piston is arranged at one end of the cavity. When the piston moves outward in the cavity, the suction function is realized. The telescopic end of the driver 3 is connected to the piston to drive the piston to move.

[0033] An array sensor 51 is arranged in the detection gas chamber 5, and a free gas inlet valve 53, an air inlet valve 55 and an air outlet 57 are arranged on the detection gas chamber 5; among them, the free gas inlet valve 53 is communicated with the third pipeline 15 through the first gas guide pipe 52, so as to realize the communication between the detection gas chamber 5 and the gas collection box 1; the air inlet valve 55 is communicated with the air pump 56 through the second gas guide pipe 54.

[0034] The array sensor includes a temperature and humidity detection unit and a gas detection unit; the gas detection unit is used to detect each gas component in the free gas.

[0035] After the light gas alarm of the gas relay, the first solenoid valve 12 and the second solenoid valve 14 are automatically opened, and at this time, the third solenoid valve 16 is in a closed state. Under the action of the oil pressure inside the transformer, the free gas in the gas relay will flow into the gas collecting box. At this time, the driver 3 drives the piston in the oil storage box 2 to move outward, slowly pumping the oil in the gas collecting box 1 into the oil storage box 2. Under the action of the pumping action and the oil pressure inside the transformer, the gas in the gas relay is collected into the gas collecting box 1; the gas component detection can be carried out at the first time after the light gas alarm.

[0036] When the oil storage box 2 is completely filled with oil, the first solenoid valve 12 and the second solenoid valve 14 are closed, and at the same time, the driver 3 stops moving. At this time, the gas collecting box 1 is filled with free gas to be detected; the third solenoid valve 16 and the free gas inlet valve 53 are opened, and at this time, the air inlet valve 55 is in a closed state, and the air outlet 57 is in an open state; it is also possible to temporarily close the air outlet during detection and then open it after the sensor reading is stable, or control the oil to be slowly injected through the driver to extend the gas residence time. It is also possible to design a tortuous flow path in the detection gas chamber to increase the contact area between the gas and the sensor.

[0037] The driver 3 drives the piston in the oil storage box 2 to move towards the cavity direction, filling the oil in the oil storage box 2 into the gas collecting box 1. At this time, the gas in the gas collecting box 1 is introduced into the detection gas chamber 5 through the first gas guide pipe 52. The array sensor 51 detects the free gas to obtain the concentration of each component of the free gas. When the gas collecting box 1 is filled with oil, the third solenoid valve 16 is closed, and the detection of the concentration of each component of the free gas is stopped, and the detection is completed; after the detection, the air inlet valve 55 is opened, and the air pump 56 is started to continuously introduce air into the detection gas chamber 5 to discharge all the residual free gas in the detection gas chamber 5. When the reading of the array sensor 51 in the detection gas chamber 5 is zero, the free gas inlet valve 53, the air inlet valve 55, the air pump 56 and the air outlet 57 are closed to return the device to the initial state.

[0038] The control of each component in the above solution can be realized through automatic control.

[0039] It should be noted that the volume V of the oil storage box 1 , the volume V of the gas collecting box 2 and the volume V of the light gas alarm gas of the gas relay 3 should satisfy: V 1 ≥ V 2 ≥ V 3 . The volume capacity of the required gas is judged by how much volume of oil is filled in the oil storage box. When the oil capacity in the oil storage box 2 reaches the preset value, the first solenoid valve 12 and the second solenoid valve 14 are closed, and the driver 3 stops working.

[0040] Specifically, the sensor array includes sensitive units for gases such as

[0041] Preferably, an observation window area is provided on the gas collecting box 1. The observation window area is the transparent outer shell of the gas collecting box 1, and a scale is provided on the transparent outer shell for displaying the remaining amount of oil in the gas collecting box 1.

[0042] Preferably, after the detection is completed, in order to discharge the residual gas in the first air duct 52, the third solenoid valve 16 can be set as a three-way solenoid valve. After the gas detection is completed, the third pipeline 15 is closed, and the other two interfaces of the three-way solenoid valve are opened and connected to air and the first air duct 52 respectively. After starting the air pump 56, the residual gas in the first air duct 52 is immediately discharged.

[0043] As an example, the driver 3 can be a hydraulic telescopic rod. The driver 3 can also be a ball screw structure driven by a stepping motor, and the positioning accuracy is more accurate.

[0044] Preferably, a safety relief valve is added to the top of the gas collecting box 1 to prevent damage to the gas relay caused by abnormal increase in oil pressure.

[0045] As Figure 2 As shown, the microprocessing device 6 is externally mounted on the wall of the detection gas chamber 5 and is electrically connected to the array-type sensor 51 in the detection gas chamber 5. The microprocessing device 6 includes a data processing module 61 and a data transmission module 62. The array-type sensor 51 is electrically connected to the data processing module 61. After the array-type sensor 51 obtains the concentration data of each component of the free gas, the analog signal is converted into a digital signal through an AD conversion circuit. The data processing module 61 optimizes and processes the data, and the data transmission module 62 transmits the optimized and processed data to the cloud platform, where it is further processed and analyzed in combination with artificial intelligence algorithms. By the component concentration of each gas, the type of fault occurring inside the transformer is further judged, and the goal of real-time monitoring of the transformer is achieved.

[0046] Preferably, the microprocessing device 6 is provided with a local storage module to prevent data loss caused by network interruption and automatically synchronize it to the cloud platform after the network is restored.

[0047] Embodiment 2 A method of monitoring using the above-mentioned on-line monitoring device for the concentration of each component of the free gas in the gas relay includes the following steps: a. Open the first solenoid valve and the second solenoid valve, and at the same time close the third solenoid valve, drive the piston in the oil storage box to move outwards, slowly pump the oil in the gas collecting box into the oil storage box, and under the action of the pumping action and the internal oil pressure of the transformer, collect the gas in the gas relay into the gas collecting box.

[0048] b. When the oil storage box is completely filled with oil, close the first solenoid valve and the second solenoid valve, and at the same time stop the movement of the driver. At this time, the gas collection box is filled with free gas to be detected.

[0049] c. Open the third solenoid valve and the free gas inlet valve, and at the same time close the air inlet valve. Drive the piston in the oil storage box to move inward through the driver, and introduce the free gas in the gas collection box into the detection gas chamber through the first gas pipe, and detect it by the array sensor to obtain the concentration of each component of the free gas.

[0050] d. After the gas detection is completed, open the air inlet valve and start the air pump to continuously introduce air into the detection gas chamber to discharge all the residual free gas in the detection gas chamber.

[0051] e. The array sensor transmits the concentration data of each component of the free gas collected to the microprocessing device; the microprocessing device preprocesses the received concentration data, makes a logical judgment according to the preprocessed concentration data and the set threshold standard, and determines the decision output based on the result of the logical judgment; wherein, the decision output includes local alarm and uploading to the cloud for further analysis and research.

[0052] Specifically, the microprocessing device preprocesses the received concentration data, makes a logical judgment according to the preprocessed concentration data and the threshold standard of the preset value, and determines the decision output based on the result of the logical judgment, including: Perform noise reduction and filtering processing on the concentration data collected by the array sensor, and supplement the noise-reduced concentration data according to the temperature and humidity to obtain preprocessed data; The formula for temperature and humidity compensation is as follows:

[0053] Among them, is the preprocessed data, is the concentration data after noise reduction and filtering processing, H is humidity, and T is temperature.

[0054] Calculate the gas ratio of each component data in the free gas according to the preprocessed data; determine the fault category and the confidence level corresponding to the fault category according to the gas ratio and the threshold standard; For example, each component in the free gas may include etc., then when calculating the ratio, it can be done in the following way:

[0055] When the confidence level is greater than the preset percentage, the decision output is a local alarm; otherwise, upload the preprocessed data to the cloud for further analysis and research.

[0056] For example, if R1 > 1 and R 2 > 2, it is determined as arc discharge (confidence level 70%); If R 3 > 3 and CO > 500 ppm, it is determined as insulation overheating (confidence level 65%).

[0057] For example, the preset percentage of the confidence level can be set to 80%. When exceeding this percentage, a local direct alarm is triggered. When lower than this percentage, the low-confidence data is uploaded to the cloud.

[0058] Specifically, the preprocessed data is uploaded to the cloud for further analysis and judgment, including: Determine the low-confidence data in the preprocessed data, and calculate the trend characteristics based on the low-confidence data; Input the low-confidence data, trend characteristics, and temperature and humidity data into a pre-trained XGBoost model, and the XGBoost model outputs the fault probability distribution; Based on the confidence level corresponding to the fault category and the fault probability distribution output by the XGBoost model, the final fault diagnosis result is determined by using a weighted fusion method.

[0059] The final fault diagnosis result is determined by using a weighted fusion method. Specifically, a first weight can be assigned to the confidence level of the fault category output by the microprocessing device, and a second weight can be assigned to the fault probability distribution, and then the weighted sum is obtained to get the final fault diagnosis result.

[0060] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. 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 can be combined in a suitable manner in any one or more embodiments or examples.

[0061] As is known by technical common sense, the present invention can be implemented by other embodiments that do not depart from its spirit or essential characteristics. Therefore, the above-disclosed embodiments are illustrative in all aspects and are not the only ones. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. An online monitoring device for the concentration of each component of free gas in a gas relay, characterized in that: include: An air collecting box, the air collecting box is filled with oil, and a first pipe, a second pipe and a third pipe connected to the inside of the air collecting box are arranged on the outer wall, and a first solenoid valve, a second solenoid valve and a third solenoid valve are arranged on the first pipe, the second pipe and the third pipe respectively; An oil storage box, wherein a sealed cavity is provided in the oil storage box, a piston is provided at one end of the cavity, and the piston is connected to the telescopic end of the driver to drive the piston to move to realize the suction function; A detection air chamber is provided in which an array sensor is arranged. A free gas inlet valve and an outlet are arranged on the detection air chamber. The free gas inlet valve is connected to the third pipeline through the first air guide pipe. Among them, when the device is running, by controlling the switching states of the first solenoid valve, the second solenoid valve and the third solenoid valve, and the movement of the driver, the free gas in the gas relay is collected into the gas collecting box, and further introduced into the detection gas chamber for detection by the array sensor to obtain the concentration of each component of the free gas.

2. The on-line monitoring device for the concentration of each component of free gas in a gas relay according to claim 1 is characterized in that: The detection air chamber is also provided with an air intake valve, which is connected to the air pump through the second air guide pipe.

3. The on-line monitoring device for the concentration of each component of free gas in a gas relay according to claim 1 is characterized in that: An observation window area is arranged on the gas collecting box. The observation window area is a transparent shell of the gas collecting box. A scale is arranged on the transparent shell to display the remaining amount of oil in the gas collecting box.

4. The on-line monitoring device for the concentration of each component of free gas in a gas relay according to claim 1 is characterized in that: It also includes a microprocessor device externally mounted on the wall of the detection air chamber; The microprocessor comprises a data processing module and a data transmission module. The array sensor is electrically connected to the data processing module. The array sensor transmits the collected concentration data of each component of the free gas to the data processing module. The data processing module pre-processes the received concentration data, performs logical judgment according to the pre-processed concentration data and the set threshold standard, and determines the decision output based on the result of the logical judgment; wherein the decision output includes local alarm and uploading to the cloud.

5. The on-line monitoring device for the concentration of each component of free gas in a gas relay according to claim 1 is characterized in that: The array sensor comprises a temperature and humidity detection unit and a gas detection unit; the gas detection unit is used to detect various gas components in the free gas.

6. A method for monitoring the concentration of each component of free gas in a gas relay using the online monitoring device for monitoring the concentration of each component of free gas in a gas relay according to any one of claims 1 to 5, characterized in that: The following steps are involved: Open the first solenoid valve and the second solenoid valve, and close the third solenoid valve at the same time, drive the piston in the oil storage box to move outward, slowly draw the oil in the gas collecting box into the oil storage box, and then collect the gas in the gas relay into the gas collecting box; When the oil storage box is completely filled with oil, the first solenoid valve and the second solenoid valve are closed, and the movement of the driver is stopped at the same time. At this time, the gas collection box is filled with free gas to be detected; The third solenoid valve and the free gas intake valve are opened, and the air intake valve is closed at the same time. The piston in the oil storage box is driven inward by the driver, and the free gas in the gas collecting box is introduced into the detection air chamber through the first air guide pipe. The array sensor detects the free gas and obtains the concentration of each component of the free gas.

7. The method according to claim 6, characterized in that After the gas detection is completed, open the air inlet valve and start the air pump to continuously supply air to the detection air chamber to exhaust all the remaining free gas in the detection air chamber.

8. The method according to claim 6, characterized in that The array sensor transmits the collected concentration data of each component of the free gas to the microprocessor; the microprocessor preprocesses the received concentration data, performs logical judgment based on the preprocessed concentration data and the set threshold standard, and determines the decision output based on the result of the logical judgment; wherein the decision output includes local alarm and uploading to the cloud.

9. The method according to claim 8, characterized in that The microprocessor preprocesses the received concentration data, performs logical judgment according to the preprocessed concentration data and a threshold standard of a preset value, and determines a decision output based on the result of the logical judgment, including: The concentration data collected by the array sensor is subjected to noise reduction and filtering, and the noise-reduced concentration data is supplemented according to temperature and humidity to obtain pre-processed data; Calculate the gas ratio of each component data in the free gas according to the preprocessing data; determine the fault category and the confidence level corresponding to the fault category according to the gas ratio and the threshold standard; When the confidence level is greater than the preset percentage, the decision output is a local alarm; otherwise, the preprocessed data is uploaded to the cloud for further analysis and judgment.

10. The method according to claim 9, characterized in that Upload the pre-processed data to the cloud for further analysis and judgment, including: Determine low-confidence data in the preprocessed data, and calculate trend features based on the low-confidence data; Input the low confidence data, trend characteristics and temperature and humidity data into a pre-trained XGBoost model, and the XGBoost model outputs a fault probability distribution; Based on the confidence level corresponding to the fault category and the fault probability distribution output by the XGBoost model, a weighted fusion method is used to determine the final fault diagnosis result.

Images