A degassing device for oil-immersed equipment

Abstract

An embodiment of the present application provides a degassing device for an oil-immersed device, the degassing device comprising an oil circuit unit, for obtaining a cooling oil sample from the oil-immersed device; a headspace degassing unit, for degassing the cooling oil sample to obtain a gas sample to be tested; a gas circuit unit, for allowing the gas sample to be tested in the headspace degassing unit to enter a measuring unit; a measuring unit, for measuring the concentration of a characteristic gas in the gas sample to be tested using a photoacoustic spectroscopy device; and a control unit, for determining an operating failure of the oil-immersed device based on the concentration of the characteristic gas, thereby enabling the degassing device of the oil-immersed device to obtain sampling data in real time, and predicting an operating failure of the oil-immersed device based on the concentration of the characteristic gas and giving an alarm, thereby avoiding damage to the oil-immersed device.

Description

Technical Field

[0001] The present application relates to the field of transformer oil and gas monitoring, and in particular to a degassing device for oil-immersed equipment. Background Art

[0002] With the rapid development of the national economy, the demand for electricity in all walks of life continues to rise. Nowadays, the power system is also developing towards ultra-high voltage, large capacity and automation. Therefore, a large number of large oil-immersed power equipment (such as transformers) are used in the power system. In order to ensure the safe operation of the power system, the operating status of large oil-immersed power equipment such as transformers must be preventively inspected and monitored.

[0003] Since oil-immersed power equipment all uses insulating structures such as insulating oil, oil paper or oil paperboard, when a thermal fault, discharge fault or aging of the insulating oil or paper occurs inside the equipment, a variety of gases will be produced. These gases will dissolve in the oil. Different types of gases dissolved in the oil can reflect different types of electrical faults.

[0004] At present, in the degassing device of the traditional oil-immersed equipment, it is necessary to manually extract the oil samples from the oil-immersed power equipment and collect them in the laboratory, and then use the gas chromatograph to determine the operating status of the oil-immersed equipment, which is inefficient. Summary of the invention

[0005] An embodiment of the present application provides a degassing device for oil-immersed equipment, which is used to solve the technical problem that the existing degassing device for oil-immersed equipment cannot obtain oil sample data in real time due to the need for manual monitoring and processing of oil sample data.

[0006] To solve the above problems, the technical solutions provided by this application are as follows:

[0007] The embodiment of the present application provides a degassing device for oil-immersed equipment, the degassing device comprising an oil circuit unit, a head space degassing unit, a gas circuit unit, a measuring unit and a control unit;

[0008] The control unit is used to send a sampling enable signal to the oil circuit unit at a first moment, so that the oil circuit unit obtains a cooling oil sample from the oil-immersed device;

[0009] The control unit is further used to send a degassing enable signal to the oil circuit unit and the head space degassing unit at a second moment to control the cooling oil sample to flow from the oil circuit unit into the head space degassing unit, and the head space degassing unit controls the stirring member in the head space degassing unit to stir the cooling oil sample according to the degassing enable signal, so that the head space degassing unit degasses the cooling oil sample to obtain a gas sample to be tested;

[0010] The control unit is also used to send a measurement enable signal to the head space degassing unit, the gas path unit and the measuring unit at a third moment, so as to control the gas sample to be measured to flow from the head space degassing unit through the gas path unit into the measuring unit, and control the photoacoustic spectrometer in the measuring unit to use the narrow bandwidth laser corresponding to the characteristic gas to respectively measure the concentration of the characteristic gas in the gas sample to be measured;

[0011] The control unit is further configured to determine an operating fault of the oil-immersed device according to the concentration of the characteristic gas in the gas sample to be measured obtained by the measuring unit at a fourth moment.

[0012] In the degassing device of the oil-immersed equipment of the present application, the oil circuit unit includes a first valve, a second valve and an oil pump, and the first valve and the second valve are connected to the oil-immersed equipment;

[0013] The first valve is used to allow the cooling oil sample in the oil-immersed device to enter the head space degassing unit through the first valve during the oil inlet stage;

[0014] The second valve is used to allow the cooling oil sample in the head space degassing unit to flow back into the oil immersed device through the oil pump and the second valve during the oil return stage.

[0015] In the degassing device of the oil-immersed equipment of the present application, the head space degassing unit comprises an oil tank, and the oil tank is used to contain the cooling oil sample;

[0016] An upper liquid level sensor, a lower liquid level sensor and a temperature sensor are arranged in the oil tank;

[0017] The upper liquid level sensor is used to measure whether the liquid level of the cooling oil sample reaches the height measured by the upper liquid level sensor during the oil inlet stage;

[0018] The lower liquid level sensor is used to measure whether the liquid level of the cooling oil sample reaches the height measured by the lower liquid level sensor during the oil discharge stage;

[0019] The temperature sensor is used to obtain the real-time temperature of the cooling oil sample.

[0020] In the degassing device of the oil-immersed equipment of the present application, the head space degassing unit further comprises a stirring component, and the stirring component is used to stir the cooling oil sample;

[0021] The stirring assembly comprises a stirring member located inside the oil tank and a driving member located outside the oil tank. The driving member is arranged close to the oil tank and is used to drive the stirring member to stir inside the oil tank.

[0022] In the degassing device of the oil-immersed equipment of the present application, the driving member includes a second driving motor and a rotating magnet fixedly connected to the driving motor;

[0023] The stirring member comprises a magnetic stirring bar having an N pole and an S pole;

[0024] The second driving motor is used to drive the rotating magnet to rotate, and the rotating rotating magnet drives the stirring member located in the oil tank to stir the cooling oil sample.

[0025] In the degassing device of the oil-immersed equipment of the present application, the head space degassing unit further comprises a gas extraction device, the gas extraction device is used to extract the gas to be measured in the oil tank into the gas extraction device, and to introduce the gas in the gas extraction device into the measuring unit through the gas path unit;

[0026] The vacuum device includes a cylinder, a piston located in the cylinder, and a first drive motor fixedly connected to the piston. The first drive motor is used to drive the piston to move in a first direction during a vacuum stage to draw the gas to be tested in the oil tank into the cylinder of the vacuum device. The first drive motor is also used to drive the piston to move in a second direction during an exhaust stage to introduce the gas to be tested in the cylinder into the measuring unit through the gas path unit.

[0027] In the degassing device of the oil-immersed equipment of the present application, the gas circuit unit includes a first gas valve, and the first gas valve includes a first port, a second port, and a third port;

[0028] The closing of the first port and the second port in the first gas valve is used to allow the gas to be tested in the oil tank to enter the cylinder of the gas extraction device;

[0029] The closing of the first port and the third port in the first gas valve is used to allow the gas to be measured in the cylinder to enter the measuring unit.

[0030] In the degassing device of the oil-immersed equipment of the present application, the gas circuit unit further includes a second gas valve, a third gas valve and a fourth gas valve, and the third port of the first gas valve is connected to the second gas valve, the third gas valve and the fourth gas valve to form a gas circuit;

[0031] The second air valve, the measuring unit and the fourth air valve constitute a first air path, the measuring unit is located between the second air valve and the fourth air valve, the third air valve constitutes a second air path, and the exhaust ports of the third air valve and the fourth air valve are connected to the exhaust port.

[0032] In the degassing device of the oil-immersed equipment of the present application, the head space degassing unit further includes a pressure sensor, and the pressure sensor is used to measure the pressure in the oil tank.

[0033] In the degassing device of the oil-immersed equipment of the present application, the head space degassing unit further includes a heating component located at the periphery of the oil tank, and the heating component is used to heat the cooling oil sample.

[0034] Beneficial effect: The embodiment of the present application provides a degassing device for oil-immersed equipment, the degassing device comprising an oil circuit unit, a head space degassing unit, a gas circuit unit, a measuring unit and a control unit; the control unit is used to send a sampling enable signal to the oil circuit unit at a first moment, so that the oil circuit unit obtains a cooling oil sample from the oil-immersed equipment; the control unit is also used to send a degassing enable signal to the oil circuit unit and the head space degassing unit at a second moment, so as to control the cooling oil sample to flow from the oil circuit unit to the head space degassing unit, and the head space degassing unit controls a stirring member in the head space degassing unit to stir the cooling oil sample according to the degassing enable signal, so that the head space degassing unit degasses the cooling oil sample to obtain a gas sample to be tested; the control unit is also used to send a measurement enable signal to the head space degassing unit, the gas circuit unit and the measuring unit at a third moment, so as to control the gas sample to be tested to flow from the head space degassing unit through the gas circuit unit into the measuring unit, and control the photoacoustic spectrometer in the measuring unit to use a narrow bandwidth laser corresponding to a characteristic gas The concentration of the characteristic gas in the gas sample to be tested is measured respectively; the control unit is also used to determine the operating failure of the oil-immersed device according to the concentration of the characteristic gas in the gas sample to be tested obtained by the measuring unit at the fourth moment; the embodiment of the present application obtains a cooling oil sample from the oil-immersed device through the oil circuit unit, uses the head space degassing unit to degas the cooling oil sample to obtain the gas sample to be tested, and uses the measuring unit to measure the concentration of the characteristic gas in the gas sample to be tested, and uses the control unit to determine the operating failure of the oil-immersed device according to the concentration of the characteristic gas, so that the degassing device of the oil-immersed device can obtain sampling data in real time, and the operating failure of the oil-immersed device can be predicted according to the concentration of the characteristic gas and an alarm is issued, thereby avoiding damage to the oil-immersed device; at the same time, the head space degassing unit uses a magnetic stirring bar to stir the cooling oil sample, removes the original mechanical stirring structure, and avoids the technical problem of vacuum failure in the degassing unit due to the existence of the mechanical stirring structure. In addition, the point contact between the magnetic stirring bar and the oil tank in the degassing unit reduces the stirring resistance of the magnetic stirring bar during the stirring process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0036] Figure 1 A schematic diagram of a scenario of an oil-immersed equipment monitoring system provided in an embodiment of the present application.

[0037] Figure 2 A structural diagram of the degassing device of the oil-immersed equipment provided in an embodiment of the present application.

[0038] Figure 3 A schematic diagram of the structure of a degassing device for an oil-immersed device provided in an embodiment of the present application.

[0039] Figure 4 A schematic structural diagram of a symmetrical gas measuring device for a degassing device of an oil-immersed device provided in an embodiment of the present application.

[0040] Figure 5 A schematic diagram of a module of a signal processing unit of a degassing device of an oil-immersed device provided in an embodiment of the present application.

[0041] Figure 6 A circuit schematic diagram of a photoelectric conversion circuit in a signal processing unit of a degassing device of an oil-immersed equipment provided in an embodiment of the present application.

[0042] Figure 7 A circuit schematic diagram of a first signal amplifying circuit in a signal processing unit of a degassing device of an oil-immersed equipment provided in an embodiment of the present application.

[0043] Figure 8 A circuit schematic diagram of a bandpass filter circuit in a signal processing unit of a degassing device of an oil-immersed equipment provided in an embodiment of the present application.

[0044] Fig. 9 A circuit schematic diagram of a second signal amplifying circuit in a signal processing unit of a degassing device of an oil-immersed equipment provided in an embodiment of the present application.

[0045] Fig.10 A circuit schematic diagram of an A / D conversion circuit in a signal processing unit of a degassing device of an oil-immersed equipment provided in an embodiment of the present application.

[0046] Fig.11 A schematic diagram of the first structure of the measurement unit provided in an embodiment of the present application.

[0047] Fig.12 A second structural schematic diagram of the measurement unit provided in an embodiment of the present application.

[0048] Fig.13 A third structural schematic diagram of the measurement unit provided in an embodiment of the present application.

[0049] Fig.14 It is a schematic diagram of the structure of the temperature control module provided in the embodiment of the present application.

[0050] Fig.15 It is a schematic diagram of the temperature control circuit in the temperature control module provided in the embodiment of the present application. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0052] See also Figure 1 , Figure 1 A scenario diagram of an oil-immersed device 200 monitoring system provided in an embodiment of the present application, wherein the oil-immersed device 200 monitoring system may include an oil-immersed device 200 and a degassing device 100 for the oil-immersed device, wherein the degassing device 100 for the oil-immersed device is connected to the oil-immersed device 200 via a pipeline.

[0053] In one embodiment, the oil-immersed device 200 may include an oil-immersed power transformer.

[0054] In one embodiment, the degassing device 100 of the oil-immersed device may include an oil circuit unit 110, a head space degassing unit 120, a gas circuit unit 130, a measuring unit 140, and a control unit 150. The degassing device 100 of the oil-immersed device first sends a sampling enable signal to the oil circuit unit 110 through the control unit 150, so that the oil circuit unit 110 obtains a cooling oil sample from the oil-immersed device 200; then the control unit 150 sends a degassing enable signal to the oil circuit unit 110 and the head space degassing unit 120 to control the cooling oil sample to flow from the oil circuit unit 110 into the head space degassing unit 120, so that the head space degassing unit 120 degasses the cooling oil sample to obtain a gas sample to be tested; then the control unit 150 A measurement enable signal is sent to the head space degassing unit 120, the gas circuit unit 130 and the measuring unit 140 to control the gas sample to be tested to flow from the head space degassing unit 120 through the gas circuit unit 130 into the measuring unit 140, and the photoacoustic spectrometer in the measuring unit 140 is controlled to use the narrow bandwidth laser corresponding to the characteristic gas to respectively measure the concentration of the characteristic gas in the gas sample to be tested; then the control unit 150 determines the operating fault of the oil-immersed device 200 according to the concentration of the characteristic gas in the gas sample to be tested obtained by the measuring unit 140.

[0055] It should be noted that Figure 1The system scenario diagram shown is an example. The server and scenario described in the embodiment of the present application are intended to more clearly illustrate the technical solution of the embodiment of the present application, and do not constitute a limitation on the technical solution provided in the embodiment of the present application. A person of ordinary skill in the art will know that with the evolution of the system and the emergence of new business scenarios, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems. The following are detailed descriptions. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0056] See also Figure 2 and Figure 3 The degassing device 100 may include an oil circuit unit 110 , a head space degassing unit 120 , a gas circuit unit 130 , a measuring unit 140 and a control unit 150 .

[0057] The control unit 150 is used to send a sampling enable signal to the oil circuit unit 110 at a first moment, so that the oil circuit unit 110 obtains a cooling oil sample from the oil-immersed device 200;

[0058] The control unit 150 is further used to send a degassing enable signal to the oil circuit unit 110 and the head space degassing unit 120 at a second moment to control the cooling oil sample to flow from the oil circuit unit 110 into the head space degassing unit 120, and the head space degassing unit 120 controls the stirring member 213 in the head space degassing unit 120 to stir the cooling oil sample according to the degassing enable signal, so that the head space degassing unit 120 degases the cooling oil sample to obtain a gas sample to be tested;

[0059] The control unit 150 is also used to send a measurement enable signal to the head space degassing unit 120, the gas circuit unit 130 and the measuring unit 140 at a third moment, so as to control the gas sample to be measured to flow from the head space degassing unit 120 through the gas circuit unit 130 into the measuring unit 140, and control the photoacoustic spectrometer in the measuring unit 140 to use the narrow bandwidth laser corresponding to the characteristic gas to respectively measure the concentration of the characteristic gas in the gas sample to be measured;

[0060] The control unit 150 is further configured to determine, at a fourth moment, an operating fault of the oil-immersed device 200 according to the concentration of the characteristic gas in the gas sample to be tested obtained by the measuring unit 140 .

[0061] The embodiment of the present application obtains a cooling oil sample from the oil-immersed equipment 200 through the oil circuit unit 110, degasses the cooling oil sample using the headspace degassing unit 120 to obtain a gas sample to be tested, measures the concentration of the characteristic gas in the gas sample to be tested using the measuring unit 140, and determines the operating failure of the oil-immersed equipment 200 according to the concentration of the characteristic gas using the control unit 150, thereby enabling the degassing device 100 of the oil-immersed equipment to obtain sampling data in real time, and predicting the operating failure of the oil-immersed equipment 200 according to the concentration of the characteristic gas and giving an alarm, thereby avoiding damage to the oil-immersed equipment 200.

[0062] The technical solution of the present application is described below based on specific embodiments.

[0063] In one embodiment, the oil circuit unit 110 includes a first valve 101, a second valve 102 and an oil pump 103, and the first valve 101 and the second valve 102 are connected to the oil-immersed device 200; the first valve 101 is used to allow the cooling oil sample in the oil-immersed device 200 to enter the head space degassing unit 120 through the first valve 101 during the oil inlet stage; the second valve 102 is used to allow the cooling oil sample in the head space degassing unit 120 to flow back to the oil-immersed device 200 through the oil pump 103 and the second valve 102 during the oil return stage.

[0064] In one embodiment, the head space degassing unit 120 includes an oil tank 210, which is used to accommodate the cooling oil sample; an upper liquid level sensor 211, a lower liquid level sensor 212 and a temperature sensor are arranged in the oil tank 210; the upper liquid level sensor 211 is used to measure whether the liquid level height of the cooling oil sample reaches the height measured by the upper liquid level sensor 211 during the oil inlet stage; the lower liquid level sensor 212 is used to measure whether the liquid level height of the cooling oil sample reaches the height measured by the lower liquid level sensor 212 during the oil outlet stage; the temperature sensor is used to obtain the real-time temperature of the cooling oil sample.

[0065] In one embodiment, the head space degassing unit 120 also includes a stirring component, which is used to stir the cooling oil sample; the stirring component includes a stirring member 213 located in the oil tank 210 and a driving member located outside the oil tank 210, and the driving member is arranged adjacent to the oil tank 210, and the driving member is used to drive the stirring member 213 to stir in the oil tank 210.

[0066] In one embodiment, the driving member includes a second driving motor 215 and a rotating magnet 214 fixedly connected to the driving motor; the stirring member 213 includes a magnetic stirring bar having an N pole and an S pole; the second driving motor 215 is used to drive the rotating magnet 214 to rotate, and the rotating rotating magnet 214 drives the stirring member 213 located in the oil tank 210 to stir the cooling oil sample. The headspace degassing unit uses a magnetic stirring bar to stir the cooling oil sample, removing the original mechanical stirring structure, avoiding the technical problem of vacuum failure in the degassing unit due to the presence of the mechanical stirring structure, and in addition, the point contact between the magnetic stirring bar and the oil tank in the degassing unit reduces the stirring resistance of the magnetic stirring bar during the stirring process.

[0067] In one embodiment, the head space degassing unit 120 also includes a vacuum device, which is used to draw the gas to be tested in the oil tank 210 into the vacuum device, and to introduce the gas in the vacuum device into the measuring unit 140 through the gas circuit unit 130; the vacuum device includes a cylinder 221, a piston 222 located in the cylinder 221, and a first drive motor 223 fixedly connected to the piston 222, the first drive motor 223 is used to drive the piston 222 to move in a first direction during the vacuum stage to draw the gas to be tested in the oil tank 210 into the cylinder 221 of the vacuum device, and the first drive motor 223 is also used to drive the piston 222 to move in a second direction during the exhaust stage to introduce the gas to be tested in the cylinder 221 into the measuring unit 140 through the gas circuit unit 130.

[0068] In one embodiment, the gas circuit unit 130 includes a first gas valve 310, and the first gas valve 310 includes a first port 311, a second port 312 and a third port 313; the closure of the first port 311 and the second port 312 in the first gas valve 310 is used to allow the gas to be tested in the oil tank 210 to enter the cylinder 221 of the gas extraction device; the closure of the first port 311 and the third port 313 in the first gas valve 310 is used to allow the gas to be tested in the cylinder 221 to enter the measuring unit 140.

[0069] In one embodiment, the gas circuit unit 130 also includes a second gas valve 320, a third gas valve 330 and a fourth gas valve 340, and the third port 313 of the first gas valve 310 is connected to the second gas valve 320, the third gas valve 330 and the fourth gas valve 340 to form a gas circuit; the second gas valve 320, the measuring unit 140 and the fourth gas valve 340 constitute a first gas circuit, the measuring unit 140 is located between the second gas valve 320 and the fourth gas valve 340, the third gas valve 330 constitutes a second gas circuit, and the exhaust ports of the third gas valve 330 and the fourth gas valve 340 are connected to the exhaust ports.

[0070] In one embodiment, the head space degassing unit 120 further includes a pressure sensor 230 , and the pressure sensor 230 is used to measure the pressure in the oil tank 210 .

[0071] In one embodiment, the head space degassing unit 120 further includes a heating component located at the periphery of the oil tank 210 , and the heating component is used to heat the cooling oil sample.

[0072] In one embodiment, when the oil circuit unit 110 obtains cooling oil samples from the oil-immersed device 200, a valve and an oil pump 103 may be provided between the oil-immersed device 200 and the oil circuit unit 110 to control the oil circuit unit 110 to obtain statistics of cooling oil samples from the oil-immersed device 200. For example, when the control unit 150 sends a sampling enable signal to the oil circuit unit 110, the valve between the oil circuit unit 110 and the oil-immersed device 200 is opened, and the oil pump 103 extracts cooling oil samples from the oil-immersed device 200 into the oil circuit unit 110, and the volume of the cooling oil sample may be specifically limited according to the working time of the oil pump 103, the working power of the oil pump 103, and the like.

[0073] In one embodiment, after the oil circuit unit 110 obtains the cooling oil sample, the cooling oil sample is pretreated. For example, when impurities exist in the cooling oil sample, the impurities such as solid particles or water in the cooling oil can be removed during the pretreatment process to improve the purity of the cooling oil sample.

[0074] In one embodiment, if Figure 2 As shown, the cooling oil sample in the oil-immersed device 200 enters the oil tank 210 in the head space degassing unit 120 through the first valve 101 in the oil circuit unit 110. The cooling oil sample in the oil tank 210 enters the oil-immersed device 200 through the oil pump 103 and the second valve 102.

[0075] In one embodiment, after obtaining the cooling oil sample, the cooling oil sample needs to be sent from the oil circuit unit 110 to the head space degassing unit 120. The control unit 150 can send a degassing enable signal to the oil circuit unit 110 and the head space degassing unit 120, so that the cooling oil sample enters the head space degassing unit 120 from the oil circuit unit 110. At the same time, after the cooling oil sample enters the head space degassing unit 120, the head space degassing unit 120 separates the gas in the cooling oil sample to obtain a gas sample to be tested.

[0076] In one embodiment, when the headspace degassing unit 120 degasses the cooling oil sample, the headspace degassing method can be used to degas the cooling oil sample. The headspace degassing method refers to allowing the cooling oil sample to enter the oil tank 210, discharging the gas above the oil tank 210, avoiding the original gas in the oil tank 210 from affecting the gas sample to be tested, so that a negative pressure is formed in the oil tank 210, and then heating the bottom of the oil tank 210 and stirring the cooling oil at the same time to separate the gas sample to be tested in the cooling oil.

[0077] See also Figure 2 In the first stage, the pressure in the oil tank 210 is pumped to the first target pressure, so that a negative pressure is formed between the oil-immersed device 200 and the oil tank 210, so that the cooling oil sample in the oil-immersed device 200 enters the oil tank 210. First, the control unit 150 controls the first drive motor 223 in the air extraction device in the head space degassing unit 120 to drive the piston 222 to suck the gas in the oil tank 210 into the cylinder 221 in the air extraction device, and discharges the gas in the cylinder 221 through the gas circuit unit 130, so that a negative pressure is formed in the oil tank 210. The gas circuit unit 130 includes a first gas valve 310, a second gas valve 320, a third gas valve 330 and a fourth gas valve 340. For example, the first port 311 and the second port 312 in the first gas valve 310 are connected, and the gas extraction device extracts part of the gas in the oil tank 210 into the cylinder 221, and then the first port 311 and the third port 313 in the first gas valve 310 are connected, and the gas in the cylinder 221 is discharged through the third gas valve 330. Repeat the above steps to reduce the pressure in the oil tank 210 to the first target pressure. For example, the external atmospheric pressure is the standard atmospheric pressure of 100Kpa, and the first target pressure in the oil tank 210 can be 2Kpa. The pressure in the oil tank 210 can be directly obtained by the pressure sensor 230.

[0078] In the second stage, the pressure difference between the oil tank 210 and the oil-immersed device 200 causes the cooling oil sample in the oil-immersed device 200 to enter the oil tank 210. First, the control unit 150 controls the first valve 101 to open so that the oil-immersed device 200 and the oil tank 210 are connected. Due to the pressure difference between the oil-immersed device 200 and the oil tank 210, the cooling oil sample in the oil-immersed device 200 enters the oil tank 210; when the cooling oil sample in the oil tank 210 reaches the height measured by the upper liquid level sensor 211, the control unit 150 controls the first valve 101 to close. The height of the upper liquid level sensor 211 can be set according to the height of the oil tank 210, for example, the height of the upper liquid level sensor 211 can be 75% of the height of the oil tank 210, or the height of the upper liquid level sensor 211 can be set according to the stirring speed of the stirring member 213 in the oil tank 210, for example, when the stirring speed of the stirring member 213 is 2400rpm, the height of the upper liquid level sensor 211 can be 75% of the height of the oil tank 210, and when the stirring speed of the stirring member 213 is 3000rpm, the height of the upper liquid level sensor 211 can be 25%. The height of the upper liquid level sensor 211 can be set to 70% of the height of the oil tank 210 to avoid the liquid level exceeding the critical height of the oil tank 210 when the cooling oil sample is stirred due to the excessive rotation speed of the stirring member 213; alternatively, the height of the upper liquid level sensor 211 can be set according to the stirring temperature of the cooling oil sample in the oil tank 210. For example, when the stirring temperature of the cooling oil sample is 50°C, the height of the upper liquid level sensor 211 can be 75% of the height of the oil tank 210; when the stirring temperature of the cooling oil sample is 70°C, the height of the upper liquid level sensor 211 can be 70% of the height of the oil tank 210.

[0079] In the third stage, the gas to be tested in the cooling oil sample enters the measuring unit 140 through the gas extraction device and the gas path unit 130 . First, the control unit 150 controls the first port 311 and the second port 312 of the first gas valve 310 to be connected, so that the gas extraction device is connected to the oil tank 210, and then the control unit 150 controls the stirring member 213 to stir the cooling oil sample in the oil tank 210, and then the gas extraction device extracts the gas to be tested in the cooling oil sample into the cylinder 221 in the gas extraction device, and then the control unit 150 controls the first port 311 and the second port 312 of the first gas valve 310 to be disconnected, and controls the first port 311 and the third port 313 of the first gas valve 310 to be connected, opens the second gas valve 320 and the fourth gas valve 340, and closes the third gas valve 330, so that the gas to be tested enters the measuring unit 140 through the gas path unit 130; secondly, repeat the above steps until the pressure in the oil tank 210 reaches the second target pressure, the above gas extraction step stops, and the first gas valve 310 is in a closed state. The second target pressure may be equal to or different from the first target pressure, and the specific value of the second target pressure may be limited according to actual conditions.

[0080] In the fourth stage, the cooling oil sample in the oil tank 210 flows back into the oil-immersed device 200. First, the control unit 150 controls the second valve 102 to connect the oil-immersed device 200 with the oil tank 210, and then controls the oil pump 103 to pump the cooling oil sample in the oil tank 210 into the oil-immersed device 200. When the liquid level of the cooling oil sample in the oil tank 210 reaches the height measured by the lower liquid level sensor 212 in the oil tank 210, the control unit 150 controls the oil pump 103 to stop working and close the second valve 102. The height measured by the lower liquid level sensor 212 can be the bottom of the oil tank 210, and the specific position is not limited in detail in this application.

[0081] The degassing device 100 of the oil-immersed equipment of the present application can obtain sampling data in real time, and can predict the operating failure of the oil-immersed equipment 200 according to the concentration of the characteristic gas and issue an alarm, thereby avoiding damage to the oil-immersed equipment 200; at the same time, the stirring speed and / or viscosity of the cooling oil sample can be adjusted in real time according to the online monitoring data, thereby shortening the detection cycle and improving the detection efficiency.

[0082] In addition, according to the working process of the degassing device 100 of the above-mentioned oil-immersed equipment, since it is necessary to complete the degassing of the gas to be tested in the oil tank 210 within the target degassing time, the stirring speed of the stirring member 213 directly affects the degassing rate of the gas to be tested. For sample oils of different viscosities or temperatures, and at different stirring speeds, the degassing rate of the gas to be tested in the sample oil from the oil-gas separation device in the degassing device of the oil-immersed equipment 200 is different. However, the degassing device of the existing oil-immersed equipment 200 is usually unable to accurately set the stirring speed of the stirring member 213 in the oil-gas separation device, resulting in a technical problem that the gas to be tested in the sample oil cannot be separated from the oil-gas separation device within the target time. This embodiment mainly obtains the real-time pressure and viscosity of the cooling oil sample in the second stage of the degassing device 100 of the oil-immersed equipment, that is, the first stirring speed of the stirring member 213 is determined according to the dynamic pressure setting in the oil tank 210.

[0083] In one embodiment, due to the influence of various uncertain factors, the concentration value of the gas to be measured actually obtained by the measuring unit 140 is generally greater than the initial predicted concentration of this embodiment. Since the cooling oil samples belong to the same batch of cooling oil samples, the stirring speed of the stirring member 213 of the next cycle can be adjusted according to the difference between the characteristic gas concentration value of the current cycle and the predicted concentration. This step may include: obtaining a first difference between the concentration of the characteristic gas in the current measurement cycle and the predicted concentration of the gas to be measured in the cooling oil sample; judging whether the first difference is greater than a first threshold; if the first difference is greater than the first threshold, according to the correlation between the concentration, degassing time and stirring speed, based on the first difference and the target degassing time, determining the second stirring speed of the stirring member 213 of the next measurement cycle; if the first difference is less than the first threshold, the first stirring speed of the stirring member 213 is the target stirring speed of the stirring member 213 in the current measurement cycle.

[0084] In one embodiment, when a first difference between the concentration of the characteristic gas in the current measurement cycle and the predicted concentration of the gas to be measured in the cooling oil sample is greater than a first threshold value, the stirring speed needs to be adjusted, and the stirring speed of the stirring member 213 has an upper limit, namely, a critical stirring speed. If the difference between the concentration of the characteristic gas in the previous measurement cycle and the predicted concentration of the gas to be measured in the cooling oil sample is large, the stirring speed of the stirring member 213 needs to be increased to a second stirring speed exceeding the critical stirring speed, and then other adjustment factors need to be adjusted to compensate for the limitation of the stirring speed.

[0085] Specifically, this embodiment uses the correlation between temperature and stirring speed to adjust the stirring temperature of the stirring member 213, that is, the temperature of the cooling oil sample, to compensate for the limitation of the stirring speed when the stirring speed cannot be increased. This step may include: determining whether the second stirring speed is greater than the critical stirring speed of the stirring member 213; if the second stirring speed is greater than the critical stirring speed of the stirring member 213, the critical stirring speed is the target stirring speed of the stirring member 213 for the next measurement cycle; according to the correlation between temperature, concentration and stirring speed, based on the critical stirring speed and the concentration of the characteristic gas, the initial temperature of the cooling oil sample in the next measurement cycle is determined; if the second stirring speed is less than the critical stirring speed of the stirring member 213, the second stirring speed is the target stirring speed of the stirring member 213 for the next measurement cycle.

[0086] In one embodiment, when a first difference between the concentration of the characteristic gas in the current measurement cycle and the predicted concentration of the gas to be measured in the cooling oil sample is greater than a first threshold, the stirring speed needs to be adjusted; and after the stirring speed of the stirring member 213 is increased, the liquid level of the cooling oil sample in the corresponding oil tank 210 will increase. Since the oil tank 210 is connected to the corresponding oil and gas pipeline, the increase in the liquid level of the cooling oil sample may cause the cooling oil sample to enter other devices through the oil and gas pipeline. Therefore, the cooling oil sample in the oil tank 210 has a critical liquid level to prevent the cooling oil sample from entering other components. Therefore, this step may include: obtaining the cooling oil sample in the current measurement cycle The liquid level of the cooling oil sample; judging whether the liquid level of the cooling oil sample is greater than the critical liquid level of the cooling oil sample; if the liquid level of the cooling oil sample is greater than the critical liquid level of the cooling oil sample, the critical liquid level is the liquid level of the cooling oil sample in the next measurement cycle, and according to the correlation between the liquid level, concentration and stirring speed, based on the critical liquid level and the concentration of the characteristic gas, determining the stirring speed of the stirring member 213 in the next measurement cycle; if the liquid level of the cooling oil sample is less than the critical liquid level of the cooling oil sample, the second stirring speed is the target stirring speed of the stirring member 213 in the next measurement cycle.

[0087] In one embodiment, the degassing time of the current measurement cycle is also an important reference value for setting the stirring speed. The degassing time represents the degassing rate of the gas to be measured in the cooling oil sample. If the degassing time is short, the degassing rate of the gas to be measured is large, corresponding to a larger stirring speed, and the stirring speed of the next measurement cycle needs to be reduced to make the degassing time of the gas to be measured equal to the target degassing time; if the degassing time is long, the degassing rate of the gas to be measured is small, corresponding to a smaller stirring speed, and the stirring speed of the next measurement cycle needs to be increased to make the degassing time of the gas to be measured equal to the target degassing time. Therefore, this step may include: obtaining the degassing time of the gas to be measured in the cooling oil sample in the current measurement cycle; judging whether the degassing time in the current measurement cycle is equal to the target degassing time; if the degassing time in the current measurement cycle is not equal to the target degassing time, according to the correlation between the concentration, degassing time and stirring speed, based on the concentration of the characteristic gas in the current measurement cycle and the target degassing time, determine the stirring speed of the stirring member 213 in the next measurement cycle.

[0088] In one embodiment, the suction pressure and suction speed of the suction device in the oil tank 210 can also be used as variables for adjusting the degassing speed, which will not be described in detail in this application.

[0089] In this step, the concentration of the characteristic gas in the gas sample to be measured obtained by the measuring unit 140 is compared with the predicted concentration of the gas to be measured, and the stirring speed or / temperature of the next measurement cycle is adjusted according to the difference between the two, so that the gas to be measured in the cooling oil sample in the next measurement cycle is separated from the head space degassing unit 120 within the target degassing time.

[0090] In one embodiment, after obtaining the gas sample to be tested, it is necessary to measure the concentration of the characteristic gas in the gas sample to be tested. The control unit 150 can send a measurement enable signal to the head space degassing unit 120, the gas circuit unit 130 and the measuring unit 140, so that the gas to be tested flows from the head space degassing unit 120 into the gas circuit unit 130, and then flows from the gas circuit unit 130 into the measuring unit 140. The photoacoustic spectrometer in the measuring unit 140 measures the concentration of the characteristic gas to obtain the concentration of each characteristic gas.

[0091] In one embodiment, after the gas sample to be tested flows from the head space degassing unit 120 into the gas circuit unit 130, the gas sample to be tested is pretreated. Considering that the gas sample to be tested may contain water, the gas sample to be tested can be dried so that the water will not affect the test of the gas sample to be tested.

[0092] In one embodiment, the characteristic gas refers to the gas separated from the cooling oil that causes the oil-immersed equipment 200 to malfunction. Different types of characteristic gases and different concentrations of characteristic gases result in different types of operating failures of the oil-immersed equipment 200. When the concentrations of different types of characteristic gases are low, operating failures of the oil-immersed equipment 200 will not occur. However, the operating failures of the oil-immersed equipment 200 can be predicted by predicting various types of characteristic gases. The characteristic gases that cause the oil-immersed equipment 200 to malfunction include hydrogen, carbon monoxide, methane, acetylene, ethylene, carbon dioxide, and ethane. When measuring the concentration of characteristic gases in the gas to be measured, there may be only one characteristic gas, that is, only one characteristic gas has a concentration greater than 0, while the concentrations of other characteristic gases are 0.

[0093] In one embodiment, the characteristic gas may be any one of methane, ethane, ethylene, acetylene, carbon monoxide, carbon dioxide and hydrogen. When measuring the gas sample to be tested, it is necessary to measure the concentrations of all types of characteristic gases in the gas sample to be tested; the standard gas sample includes gases such as methane, ethane, ethylene, acetylene, carbon monoxide, carbon dioxide and hydrogen, and the sample standard concentration of the characteristic gas in the standard gas sample is a known concentration.

[0094] Specifically, due to the characteristics of hydrogen itself, the concentration of hydrogen can be directly obtained in the cooling oil sample through a specific measuring device. For example, before the degassing unit 120 degasses the cooling oil sample, it can control the symmetrical gas measuring device in the measuring unit 140 to use a symmetrical gas absorption member to immerse the cooling oil sample in the degassing unit 120 to measure and obtain the current concentration of hydrogen.

[0095] See also Figure 4 , Figure 4 A schematic structural diagram of a symmetrical gas measuring device of a degassing apparatus of an oil-immersed device provided in an embodiment of the present application, wherein the symmetrical gas measuring device 600 includes: a symmetrical gas absorption component 620, for absorbing the symmetrical gas in the cooling oil sample, the photosensitivity of the symmetrical gas absorption component 620 being related to the concentration of the symmetrical gas absorbed by the symmetrical gas absorption component 620; a laser emitting unit 610, for emitting a first optical signal to the symmetrical gas absorption component 620; a signal acquisition unit 630, for receiving a second optical signal reflected back from the first optical signal after the symmetrical gas absorption component 620 absorbs the symmetrical gas; and a signal processing unit 640, for determining the concentration of the symmetrical gas in the cooling oil sample based on a change in the second optical signal and the first optical signal.

[0096] Further, the signal processing unit 640 is used to determine the concentration of the symmetrical gas absorbed by the symmetrical gas absorption component 620 according to the phase change value between the second optical signal and the first optical signal, and determine the concentration of the symmetrical gas in the cooling oil sample according to the symmetrical gas concentration absorbed by the symmetrical gas absorption component 620. The signal processing unit 640 feeds back the phase change value between the first optical signal and the second optical signal and the symmetrical gas concentration absorbed by the symmetrical gas absorption component 620 through a signal processing circuit.

[0097] In one embodiment, the signal processing unit 640, based on the phase change value of the first light signal continuously emitted by the laser emitting unit 610 to the symmetrical gas absorption component 620 or the first light signal emitted to the symmetrical gas absorption component 620 at a preset frequency interval and the second light signal reflected by the symmetrical gas absorption component 620, firstly, the signal processing circuit converts the first light signal and the second light signal into a first analog signal and a second analog signal, and feeds back the phase difference between the first analog signal and the second analog signal through the phase difference between the first analog signal and the second analog signal; then, other circuit modules of the signal processing circuit further convert the phase difference signal of the analog signal, and finally convert it into the concentration of the symmetrical gas absorbed by the symmetrical gas absorption component 620, so that the user can determine the concentration of the symmetrical gas in the cooling oil sample according to the concentration of the symmetrical gas absorbed by the symmetrical gas absorption component 620.

[0098] In one embodiment, the symmetrical gas measurement device 600 further includes a monitoring unit 631, wherein the monitoring unit 631 is used to monitor the phase change of the second optical signal, and after monitoring that the phase change value of the second optical signal is less than a preset value and lasts for a preset time, trigger the signal processing unit 640 to calculate the phase change value of the second optical signal and the first optical signal. Specifically, when the monitoring unit monitors that the phase change value of the second optical signal is less than a preset value and lasts for a preset time, it indicates that the concentration of the symmetrical gas absorbed on the surface of the symmetrical gas measurement device 600 placed in the cooling oil sample has tended to a stable state, and the signal processing unit 640 can be triggered to calculate the phase change value of the second optical signal and the first optical signal.

[0099] See also Figure 4 The signal acquisition unit 630 in the symmetrical gas measurement device 600 also includes a first reset unit 632. The first reset unit 632 is used to delete and reset the data of the previous detection at the end of each detection or before the start of the next detection to ensure the accuracy of the next detection data.

[0100] In one embodiment, the signal processing unit 640 in the symmetrical gas measuring device 600 further includes a second resetting unit 641, which is also used to delete and reset the data of the previous detection at the end of each detection or before the start of the next detection to ensure the accuracy of the next detection data.

[0101] In one embodiment, the symmetrical gas absorption member 620 comprises a laser fiber sensor with at least one layer of palladium nickel alloy film coated on the surface.

[0102] Specifically, the palladium-nickel alloy can only adsorb hydrogen. A palladium-nickel alloy film coated on the surface of the symmetrical gas absorption member 620 can be directly used to measure the concentration of the symmetrical gas in the cooling oil sample.

[0103] In one embodiment, the palladium-nickel alloy film on the surface of the symmetrical gas absorption member 620 has a thickness ranging from 10 to 400 um.

[0104] See also Figure 5 , Figure 5 A module schematic diagram of a signal processing unit 640 of a degassing device of an oil-immersed equipment provided in an embodiment of the present application; the signal processing circuit mainly includes: a photoelectric conversion circuit 61, a first signal amplifying circuit 62, a bandpass filtering circuit 63, a second signal amplifying circuit 64 and an A / D conversion circuit 65, the output end of the photoelectric conversion circuit 61 is electrically connected to the input end of the first signal amplifying circuit 62, the output end of the first signal amplifying circuit 62 is electrically connected to the input end of the bandpass filtering circuit 63, the output end of the bandpass filtering circuit 63 is electrically connected to the input end of the second signal amplifying circuit 64, and the output end of the second signal amplifying circuit 64 is electrically connected to the A / D conversion circuit 65.

[0105] See also Figures 6 to 10 , the signal processing circuit includes:

[0106] The photoelectric conversion circuit 61 is used to convert the optical signal into an electrical signal. At this time, the electrical signal is an analog signal. The photoelectric conversion circuit 61 includes a first integrated circuit. The first integrated circuit and each circuit element convert the phase change between the first optical signal and the second optical signal into a phase change before and after the analog signal. After subsequent processing by the circuit unit, the phase change before and after the analog signal is finally converted into the symmetrical gas concentration absorbed by the symmetrical gas absorption component 620.

[0107] The first signal amplifying circuit 62 is connected to the output end of the photoelectric conversion circuit 61, and is used to amplify the analog quantities of the first optical signal and the second optical signal received or reflected by the symmetrical gas absorption component 620. Since the analog quantities obtained from the first optical signal and the second optical signal are relatively weak, amplification is required to facilitate further signal processing.

[0108] The bandpass filter circuit 63 has an input end connected to the output end of the first signal amplifying circuit 62. The bandpass filter circuit 63 is used to filter the signal output by the first signal amplifying circuit 62. The purpose is to filter out useless high-frequency and low-frequency signals and extract useful intermediate-frequency signals. The bandpass filter circuit 63 uses a second integrated circuit.

[0109] The second signal amplifying circuit 64 has its input end connected to the output end of the bandpass filtering circuit 63, and transmits the output signal of the bandpass filtering circuit 63 to the A / D conversion circuit 65 after amplification, which is equivalent to a secondary amplification of the signal. The purpose is to make the signal obtained by the A / D conversion circuit 65 more accurate and easier to convert. The second signal amplifying circuit 64 also uses a second integrated circuit.

[0110] A / D conversion circuit 65, the input end of the A / D conversion circuit 65 is connected to the output end of the second signal amplification circuit 64, and is used to convert the analog quantity output by the second signal amplification circuit 64 into a digital quantity, which is a process of converting a discrete quantity into a continuous quantity, and transmit the obtained digital quantity to the concentration adjustment unit. The A / D conversion circuit 65 uses a third integrated circuit.

[0111] See also Fig.11 , Fig.11 This is a schematic diagram of the first structure of the measurement unit provided in an embodiment of the present application, wherein the measurement unit 140 includes a plurality of detection units 51 that do not interfere with each other.

[0112] Specifically, the gas circuit unit 130 is used to control the gas sample to be measured to flow from the gas circuit unit 130 into all the detection units 51 according to the measurement enable signal.

[0113] The detection unit 51 is used to measure the concentration of the characteristic gas using the narrow bandwidth laser corresponding to the characteristic gas to be detected by the detection unit 51 according to the measurement enable signal.

[0114] It should be noted that the characteristic gas to be measured by the detection unit 51 refers to the characteristic gas that the detection unit 51 needs to measure; the detection unit 51 controls the photoacoustic spectrometer in the detection unit 51 according to the measurement enable signal to use the narrow bandwidth laser corresponding to the characteristic gas to be measured by the detection unit 51.

[0115] It should be noted that each of the detection units 51 can independently realize the measurement of a characteristic gas. The gas sample to be measured is flushed into multiple detection units 51. The characteristic gas in the gas sample to be measured can be measured simultaneously by using multiple detection units 51 that do not interfere with each other. Different types of characteristic gases correspond to narrow-bandwidth lasers of different wavelengths. Different detection units 51 can use narrow-bandwidth lasers of different wavelengths to measure different types of characteristic gases in the gas sample to be measured, thereby simultaneously measuring the concentrations of multiple characteristic gases in the gas sample to be measured.

[0116] In one embodiment, a plurality of the detection units 51 are connected in series, which can also be understood as a plurality of the detection units 51 being connected in cascade; the gas circuit unit 130 is used to control the gas sample to be tested to flow from the gas circuit unit 130 into all the detection units 51 in sequence according to the measurement enable signal.

[0117] The two adjacent detection units 51 are connected via a connecting pipe 513 , and a valve is provided on the connecting pipe 513 , so that the gas samples to be tested can flow into the detection units 51 in sequence, and at the same time, it can be ensured that all detection units 51 do not interfere with each other.

[0118] It should be noted that each of the detection units 51 is provided with an air inlet 511b and an air outlet 511c. When the measuring unit 140 includes m detection units 51, the m detection units 51 are connected in cascade, and the air inlet 511b of the detection unit 51 located at the first stage can also be connected with the gas circuit unit 130 through a connecting pipe 513 provided with a valve, so as to be connected to the gas sample to be tested flowing out of the gas circuit unit 130; after the gas sample to be tested flows into the detection unit 51 of the first stage, the gas sample to be tested flows into all the detection units 51 in turn through the connecting pipe 513; the air outlet 511c of the detection unit 51 located at the last stage can also be connected with the gas circuit unit 130 through a connecting pipe 513 provided with a valve, so as to flow the gas sample to be tested after the measurement from the detection unit 51 into the gas circuit unit 130, and the gas sample to be tested after the measurement is processed by the gas circuit unit 130 is discharged, so as to avoid the gas to be tested from polluting the environment.

[0119] The air inlet 511 b and the air outlet 511 c may be located at the same side of the detection unit 51 , so that two adjacent stages of the detection units 51 are connected via the connecting pipe 513 .

[0120] See also Fig.12 , Fig.12 A second structural schematic diagram of the measurement unit provided in an embodiment of the present application.

[0121] In one embodiment, the measuring unit 140 further includes a box 514 , and all the detection units 51 are disposed in the box 514 .

[0122] In one embodiment, the chassis may be a cubic structure, and a plurality of slide rails 515 for supporting the detection unit 51 are provided on the inner wall of the chassis. The plurality of slide rails 515 are arranged at intervals along the height direction of the chassis, and the detection unit 51 corresponds to the slide rails 515 one by one; the detection unit 51 is slidably connected to the slide rails 515 along the length direction of the slide rails 515 to facilitate the inspection and replacement of the detection unit 51. For example, when a detection unit 51 fails, the staff can pull the detection unit 51 out of the chassis for inspection. When the detection unit 51 cannot be repaired, the faulty detection unit 51 can be replaced with a normally functioning detection unit 51 to avoid the measurement unit 140 from failing to work when a single detection unit 51 fails.

[0123] In one embodiment, the box 514 is further provided with an interface 516, at least one of the interfaces 516 is connected to the control unit 150, and the detection unit 51 is provided with a connector 517 matching the interface 516, and the connector 517 is plugged into the interface 516. An information interaction bridge is built by connecting the interface 516 and the connector 517 to realize information interaction between the control unit 150 and the detection unit 51, thereby realizing the control of the detection unit 51 by the control unit 150 and the information feedback of the detection unit 51 to the control unit 150.

[0124] See also Fig.13 , Fig.13 A third structural schematic diagram of the measurement unit provided in an embodiment of the present application.

[0125] The detection unit 51 includes a photoacoustic cell 511 and a microphone 512 disposed in the photoacoustic cell 511 .

[0126] Among them, the photoacoustic cell 511 is used to accommodate the gas sample to be tested, and the photoacoustic cell 511 can be a resonant photoacoustic cell 511 to improve the detection sensitivity of the photoacoustic cell 511; the microphone 512 is used to detect the photoacoustic signal generated after the characteristic gas in the gas sample to be tested absorbs the narrow bandwidth laser, and the microphone 512 can convert the sound signal generated after the characteristic gas in the gas sample to be tested absorbs the narrow bandwidth laser into an analog signal.

[0127] Specifically, the photoacoustic cell 511 and the microphone 512 form a photoacoustic spectroscopy device in the detection unit 51 .

[0128] Specifically, the photoacoustic cell 511 includes a resonant cavity 511a for accommodating the gas sample to be measured, and the gas inlet 511b and the gas outlet 511c are connected to the resonant cavity 511a. When measuring the gas sample to be measured, the gas sample to be measured enters the resonant cavity 511a from the gas inlet 511b.

[0129] Specifically, the photoacoustic cell 511 further includes a transparent window 511d, and the narrow-bandwidth laser passes through the transparent window 511d and enters the resonant cavity 511a.

[0130] In one embodiment, each of the detection units 51 is used to measure the concentration of a characteristic gas.

[0131] It should be noted that when measuring the gas sample to be tested, one detection unit 51 is only used to measure the concentration of one characteristic gas in the gas sample to be tested, that is, each detection unit 51 corresponds to one characteristic gas, and the control unit 150 controls the detection unit 51 to measure the characteristic gas using a narrow-bandwidth laser of a corresponding wavelength according to the type of characteristic gas that the detection unit 51 needs to measure.

[0132] Specifically, all detection units 51 can perform measurements at the same time, and all detection units 51 can be used to measure the concentrations of different types of characteristic gases in the same period of time to improve detection efficiency; two or more detection units 51 can also be used to detect the concentration of the same characteristic gas in the same period of time to obtain multiple concentration detection results of the same characteristic gas, and compare the multiple concentration detection results to ensure the accuracy of the concentration detection results.

[0133] Specifically, a time period refers to the time period required to measure the concentration of a characteristic gas.

[0134] In one embodiment, each detection unit 51 includes an independent laser 52, and the laser 52 is used to emit narrow-bandwidth laser according to the light-emitting enable signal sent by the control unit 150. The laser 52 can be a narrow-bandwidth laser, such as a DFB laser.

[0135] Among them, all the detection units 51 can be used to simultaneously use the corresponding lasers 52 to output narrow-bandwidth lasers corresponding to each characteristic gas to measure the concentration of the corresponding characteristic gas, so as to improve the detection efficiency.

[0136] See also Fig.14 and Fig.15 , Fig.14 is a schematic diagram of the structure of the temperature control module provided in the embodiment of the present application, Fig.15 It is a schematic diagram of the temperature control circuit in the temperature control module provided in the embodiment of the present application.

[0137] In one embodiment, the measuring unit 140 further includes a temperature control module, which is used to control the temperature of the laser diode. Specifically, the temperature control module includes a voltage controller 721, a voltage regulator 722, a voltage comparator 723, a microprogram controller 724 and a thermostat 725, wherein the voltage controller 721, the voltage regulator 722, the voltage comparator 723 and the microprogram controller 724 constitute a thermostat circuit 720 of the thermostat module.

[0138] The voltage controller 721 is used to provide a reference voltage, which is the optimal value of the effective working voltage of the laser diode. That is, when the effective working voltage of the laser diode is equal to the reference voltage, the laser diode can emit a narrow-bandwidth laser of a specific frequency and power, and is used to detect the concentration of the characteristic gas in the gas sample to be measured, so that the measurement accuracy and sensitivity of the measurement unit 140 are both optimal; in addition, the closer the effective working voltage of the laser diode is to the reference voltage, the higher the accuracy and sensitivity of the measurement unit 140 for measuring the concentration of the characteristic gas. The input end of the voltage regulator 722 is electrically connected to the output end of the voltage controller 721, and is used to stabilize the reference voltage provided by the voltage controller 721, eliminate the fluctuation of the reference voltage, and improve the stability and consistency of the reference voltage. The first input end of the voltage comparator 723 is electrically connected to the output end of the voltage regulator 722, and the second input end of the voltage comparator 723 is electrically connected to the output end of the third voltage acquisition module 710. The voltage comparator 723 is used to compare the effective working voltage of the laser diode with the voltage value of the reference voltage provided by the voltage controller 721, and transmit the comparison result to the microprogram controller 724. The input end of the microprogram controller 724 is electrically connected to the output end of the voltage comparator 723, and is used to receive and analyze the comparison result, and send a corresponding temperature adjustment instruction to the thermostat 725 according to the comparison result.

[0139] Specifically, when the comparison result is that the effective working voltage of the laser diode is less than the reference voltage, the microprogram controller 724 sends a temperature adjustment instruction to the thermostat 725 to reduce the temperature of the laser diode; when the comparison result is that the effective working voltage of the laser diode is greater than the reference voltage, the microprogram controller 724 sends a temperature adjustment instruction to the thermostat 725 to increase the temperature of the laser diode; when the comparison result is that the effective working voltage of the laser diode is equal to the reference voltage, the microprogram controller 724 sends a temperature adjustment instruction to the thermostat 725 to maintain the temperature of the laser diode. The input end of the thermostat 725 is electrically connected to the output end of the microprogram controller 724, and is used to adjust the temperature of the laser diode under the control of the temperature adjustment instruction, so that the laser diode works within a preset temperature range.

[0140] In one embodiment, since the characteristic gases that cause the oil-immersed equipment 200 to malfunction may include hydrogen, carbon monoxide, methane, acetylene, ethylene, carbon dioxide, and ethane, when measuring the concentration of the characteristic gas in the gas to be measured, there may be only one characteristic gas present, that is, only one characteristic gas has a concentration greater than 0, while the concentrations of the other characteristic gases are 0. The oil-immersed equipment 200 corresponds to different fault types, and the types of characteristic gases measured from the gas sample to be tested are different. For example, when the fault type is cooling oil overheating, the corresponding characteristic gas types are hydrogen, ethylene, methane and ethane; when the fault type is cooling oil and paper overheating, the corresponding characteristic gas types are hydrogen, carbon monoxide, carbon dioxide, ethylene, methane, and ethane; when the fault type is local discharge in cooling oil and paper insulation, the corresponding characteristic gas types are hydrogen, carbon monoxide, carbon dioxide, acetylene, methane, and ethane; when the fault type is spark discharge in cooling oil, the corresponding characteristic gases are hydrogen and acetylene; when the fault type is arc discharge in cooling oil, the corresponding characteristic gases are hydrogen, acetylene, ethylene, methane and ethane; when the fault type is arc discharge in cooling oil and paper, the corresponding characteristic gases are hydrogen, carbon monoxide, carbon dioxide, acetylene, ethylene, methane and ethane; when the fault type is damp paper or bubbles in cooling oil, the corresponding characteristic gas is hydrogen.

[0141] An embodiment of the present application provides a degassing device for an oil-immersed device, the degassing device comprising an oil circuit unit for obtaining a cooling oil sample from the oil-immersed device; a headspace degassing unit for degassing the cooling oil sample to obtain a gas sample to be tested; a gas circuit unit for allowing the gas sample to be tested in the headspace degassing unit to enter a measuring unit; a measuring unit for measuring the concentration of a characteristic gas in the gas sample to be tested; and a control unit for determining an operating failure of the oil-immersed device according to the concentration of the characteristic gas, thereby enabling the degassing device of the oil-immersed device to obtain sampling data in real time, and predicting an operating failure of the oil-immersed device according to the concentration of the characteristic gas and giving an alarm, thereby avoiding damage to the oil-immersed device; at the same time, the stirring speed and / or viscosity of the cooling oil sample can be adjusted in real time according to online monitoring data, thereby shortening the detection cycle, improving the detection efficiency, and solving the technical problem that the existing oil-immersed device operation status monitoring equipment is usually unable to accurately set the stirring speed of the stirring component in the oil-gas separation equipment.

[0142] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0143] The above is a detailed introduction to a degassing device for an oil-immersed equipment provided in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A degassing device for oil-immersed equipment, characterized in that: The degassing device comprises an oil circuit unit, a head space degassing unit, a gas circuit unit, a measuring unit and a control unit; The control unit is used to send a sampling enable signal to the oil circuit unit at a first moment, so that the oil circuit unit obtains a cooling oil sample from the oil-immersed device; The control unit is further used to send a degassing enable signal to the oil circuit unit and the head space degassing unit at a second moment to control the cooling oil sample to flow from the oil circuit unit into the head space degassing unit, and the head space degassing unit controls the stirring member in the head space degassing unit to stir the cooling oil sample according to the degassing enable signal, so that the head space degassing unit degasses the cooling oil sample to obtain a gas sample to be tested; The control unit is also used to send a measurement enable signal to the head space degassing unit, the gas path unit and the measuring unit at a third moment, so as to control the gas sample to be measured to flow from the head space degassing unit through the gas path unit into the measuring unit, and control the photoacoustic spectrometer in the measuring unit to use the narrow bandwidth laser corresponding to the characteristic gas to respectively measure the concentration of the characteristic gas in the gas sample to be measured; The control unit is further used to determine the operation failure of the oil-immersed device according to the concentration of the characteristic gas in the gas sample to be tested obtained by the measuring unit at the fourth moment; Wherein, the head space degassing unit comprises an oil tank and a gas extraction device, the oil tank is used to contain the cooling oil sample, the gas extraction device is used to extract the gas to be tested in the oil tank into the gas extraction device, and to introduce the gas in the gas extraction device into the measuring unit through the gas path unit; The gas circuit unit comprises a first gas valve, a second gas valve, a third gas valve and a fourth gas valve, the first gas valve comprises a first port, a second port and a third port, the third port of the first gas valve forms a gas circuit connection with the second gas valve, the third gas valve and the fourth gas valve; The closure of the first port and the second port in the first gas valve is used to allow the gas to be tested in the oil tank to enter the cylinder of the gas extraction device, and the closure of the first port and the third port in the first gas valve is used to allow the gas to be tested in the cylinder to enter the measuring unit; The second air valve, the measuring unit and the fourth air valve constitute a first air path, the measuring unit is located between the second air valve and the fourth air valve, the third air valve constitutes a second air path, and the exhaust ports of the third air valve and the fourth air valve are connected to the exhaust port.

2. The degassing device for oil-immersed equipment according to claim 1, characterized in that: The oil circuit unit comprises a first valve, a second valve and an oil pump, wherein the first valve and the second valve are connected to the oil-immersed device; The first valve is used to allow the cooling oil sample in the oil-immersed device to enter the head space degassing unit through the first valve during the oil inlet stage; The second valve is used to allow the cooling oil sample in the head space degassing unit to flow back into the oil immersed device through the oil pump and the second valve during the oil return stage.

3. The degassing device for oil-immersed equipment according to claim 2, characterized in that: An upper liquid level sensor, a lower liquid level sensor and a temperature sensor are arranged in the oil tank; The upper liquid level sensor is used to measure whether the liquid level of the cooling oil sample reaches the height measured by the upper liquid level sensor during the oil inlet stage; The lower liquid level sensor is used to measure whether the liquid level of the cooling oil sample reaches the height measured by the lower liquid level sensor during the oil discharge stage; The temperature sensor is used to obtain the real-time temperature of the cooling oil sample.

4. The degassing device for oil-immersed equipment according to claim 3, characterized in that: The head space degassing unit further comprises a stirring component, and the stirring component is used to stir the cooling oil sample; The stirring assembly comprises a stirring member located inside the oil tank and a driving member located outside the oil tank. The driving member is arranged close to the oil tank and is used to drive the stirring member to stir inside the oil tank.

5. The degassing device for oil-immersed equipment according to claim 4, characterized in that: The driving member includes a second driving motor and a rotating magnet fixedly connected to the second driving motor; The stirring member comprises a magnetic stirring bar having an N pole and an S pole; The second driving motor is used to drive the rotating magnet to rotate, and the rotating rotating magnet drives the stirring member located in the oil tank to stir the cooling oil sample.

6. The degassing device for oil-immersed equipment according to claim 4, characterized in that: The vacuum device includes a cylinder, a piston located in the cylinder, and a first drive motor fixedly connected to the piston. The first drive motor is used to drive the piston to move in a first direction during a vacuum stage to draw the gas to be tested in the oil tank into the cylinder of the vacuum device. The first drive motor is also used to drive the piston to move in a second direction during an exhaust stage to introduce the gas to be tested in the cylinder into the measuring unit through the gas path unit.

7. The degassing device for oil-immersed equipment according to claim 6, characterized in that: The head space degassing unit further comprises a pressure sensor, and the pressure sensor is used to measure the pressure in the oil tank.

8. The degassing device for oil-immersed equipment according to claim 6, characterized in that: The head space degassing unit further comprises a heating component located at the periphery of the oil tank, wherein the heating component is used to heat the cooling oil sample.

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