CN112213267A - Headspace degassing method and device of oil-immersed equipment - Google Patents

Headspace degassing method and device of oil-immersed equipment Download PDF

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CN112213267A
CN112213267A CN202011055448.5A CN202011055448A CN112213267A CN 112213267 A CN112213267 A CN 112213267A CN 202011055448 A CN202011055448 A CN 202011055448A CN 112213267 A CN112213267 A CN 112213267A
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degassing
unit
cooling oil
gas
oil sample
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CN112213267B (en
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杨军
徐辉
代犇
李俊逸
费明和
黄杰
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Hubei Infotech Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/34—Purifying; Cleaning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
    • G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases

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Abstract

The embodiment of the application provides a headspace degassing method and device of an oil-immersed device, the headspace degassing method of the oil-immersed device obtains a cooling oil sample from the oil-immersed device, carries out degassing treatment on the cooling oil sample to obtain a gas sample to be detected, measures the concentration of characteristic gas in the gas sample to be detected by using a photoacoustic spectroscopy device, determines the operation fault of the oil-immersed device according to the concentration of the characteristic gas, realizes that the headspace degassing device of the oil-immersed device obtains sampling data in real time, can predict the operation fault of the oil-immersed device according to the concentration of the characteristic gas and gives an alarm, and avoids the damage of the oil-immersed device; meanwhile, a degassing device in the degassing unit is used for stirring the cooling oil sample in the degassing unit within a preset liquid level height, so that the gas sample to be detected is separated from the degassing unit within target degassing time, and the detection speed is improved.

Description

Headspace degassing method and device of oil-immersed equipment
Technical Field
The application relates to the field of oil and gas monitoring of transformers, in particular to a headspace degassing method and device of oil-immersed equipment.
Background
With the rapid development of national economy, the demand of various industries on electric power is continuously rising, and nowadays, electric power systems are also developing towards ultrahigh voltage, large capacity and automation direction, so that a large number of large oil-immersed electric power devices (such as transformers) are adopted in the electric power systems, and in order to ensure the safe operation of the electric power systems, the operation states of the large oil-immersed electric power devices such as the transformers need to be preventively checked and monitored.
Because insulating structures such as insulating oil, oiled paper or oiled paper board are all selected for use to oily formula power equipment, when the inside thermal fault that takes place of equipment, discharge nature trouble or insulating oil, paper age, can produce multiple gas, these gas can be dissolved in oil, and the gas of the different grade type of dissolving in oil can reflect the electrical fault of different grade type.
At present, in a headspace degassing scheme of a traditional oil-immersed device, after an oil sample in the oil-immersed power device needs to be manually extracted and concentrated in a laboratory, a gas chromatograph is used for determining the running state of the oil-immersed device, and the efficiency is low.
Disclosure of Invention
The embodiment of the application provides a headspace degassing method and device for an oil-immersed device, which are used for solving the technical problem that the existing headspace degassing device for the oil-immersed device cannot acquire oil sample data in real time due to the fact that the oil sample data needs to be manually monitored and processed.
In order to solve the above problems, the technical solution provided by the present application is as follows:
the embodiment of the application provides a headspace degassing method of an oil-immersed device, which is applied to a headspace degassing device of the oil-immersed device, wherein the headspace degassing device of the oil-immersed device comprises an oil line unit, a degassing unit, an air circuit unit, a measuring unit and a control unit, the degassing unit comprises a degassing device, and the headspace degassing method of the oil-immersed device comprises the following steps:
the control unit sends a sampling enabling signal to the oil circuit unit so that the oil circuit unit obtains a cooling oil sample from oil-immersed equipment;
the control unit sends a degassing enabling signal to the oil path unit and the degassing unit to control the cooling oil sample to flow into the degassing unit from the oil path unit, and the degassing device is used for stirring the cooling oil sample in the degassing unit within a preset liquid level height so that the degassing unit degasses the cooling oil sample to obtain a gas sample to be tested;
the control unit sends measurement enabling signals to the degassing unit, the gas circuit unit and the measuring unit so as to control the gas sample to be measured to flow into the measuring unit from the degassing unit through the gas circuit unit and control a photoacoustic spectroscopy device in the measuring unit to respectively measure the concentration of the characteristic gas in the gas sample to be measured by using narrow-bandwidth laser corresponding to the characteristic gas;
and the control unit determines the operation fault of the oil-immersed equipment according to the concentration of the characteristic gas in the gas sample to be measured, which is obtained by the measuring unit.
Meanwhile, the embodiment of the application provides a headspace degassing device of oil-immersed equipment, the headspace degassing device comprises an oil path unit, a degassing unit, an air path unit, a measuring unit and a control unit, and the degassing unit comprises a degassing device;
the control unit sends a sampling enabling signal to the oil path unit at a first moment so that the oil path unit obtains a cooling oil sample from the oil-immersed equipment;
the control unit is also used for sending a degassing enabling signal to the oil path unit and the degassing unit at a second moment so as to control the cooling oil sample to flow into the degassing unit from the oil path unit, and the degassing device is used for stirring the cooling oil sample in the degassing unit within a preset liquid level height so that the degassing unit is used for degassing the cooling oil sample to obtain a gas sample to be tested;
the control unit further sends a measurement enabling signal to the degassing unit, the gas circuit unit and the measurement unit at a third moment so as to control the gas sample to be measured to flow into the measurement unit from the degassing unit through the gas circuit unit and control a photoacoustic spectroscopy device in the measurement unit to measure the concentration of the characteristic gas in the gas sample to be measured by using narrow-bandwidth laser corresponding to the characteristic gas respectively;
and the control unit also determines the operation fault of the oil-immersed equipment at a fourth moment according to the concentration of the characteristic gas in the gas sample to be measured, which is obtained by the measuring unit.
Has the advantages that: the embodiment of the application provides a headspace degassing method and device of oil-immersed equipment, the headspace degassing method of the oil-immersed equipment is applied to a headspace degassing device of the oil-immersed equipment, the headspace degassing device of the oil-immersed equipment comprises an oil line unit, a degassing unit, an air line unit, a measuring unit and a control unit, the degassing unit comprises a degassing device, and the headspace degassing method of the oil-immersed equipment comprises the steps that the control unit firstly sends a sampling enabling signal to the oil line unit so that the oil line unit obtains a cooling oil sample from the oil-immersed equipment; then the control unit sends a degassing enabling signal to the oil path unit and the degassing unit to control the cooling oil sample to flow into the degassing unit from the oil path unit, and the degassing device is used for stirring the cooling oil sample in the degassing unit within a preset liquid level height so that the degassing unit degasses the cooling oil sample to obtain a gas sample to be tested; then the control unit sends measurement enabling signals to the degassing unit, the gas circuit unit and the measuring unit so as to control the gas sample to be measured to flow into the measuring unit from the degassing unit through the gas circuit unit and control a photoacoustic spectroscopy device in the measuring unit to respectively measure the concentration of the characteristic gas in the gas sample to be measured by using narrow-bandwidth laser corresponding to the characteristic gas; then the control unit determines the operation fault of the oil-immersed equipment according to the concentration of the characteristic gas in the gas sample to be measured, which is obtained by the measuring unit; according to the embodiment of the application, the cooling oil sample is obtained from the oil-immersed equipment, the cooling oil sample is subjected to degassing treatment to obtain the gas sample to be detected, the concentration of the characteristic gas in the gas sample to be detected is measured, the operation fault of the oil-immersed equipment is determined according to the concentration of the characteristic gas, the fact that a headspace degassing device of the oil-immersed equipment obtains sampling data in real time is achieved, the operation fault of the oil-immersed equipment can be predicted according to the concentration of the characteristic gas to give an alarm, and damage to the oil-immersed equipment is avoided; meanwhile, the degassing device in the degassing unit is used for stirring the cooling oil sample in the degassing unit in a preset liquid level height, so that the degassing unit is used for degassing the cooling oil sample to obtain a gas sample to be detected, the stirring component does not need to consider the technical problem that the liquid level height of the cooling oil sample is too high due to too high stirring speed in the stirring process, the gas sample to be detected is separated from the degassing unit in the target degassing time, the detection period is shortened, the detection efficiency is improved, and the technical problem that the stirring speed of the stirring component in the oil-gas separation equipment cannot be accurately set by the headspace degassing equipment of the existing oil-immersed equipment is solved.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a scene schematic diagram of an oil-immersed device monitoring system provided in an embodiment of the present application.
Fig. 2 is a schematic flow diagram of a headspace degassing method for an oil-filled device according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a head space degasser of an oil-filled device according to the present invention.
Fig. 4 is a schematic structural diagram of a symmetrical gas measurement device of a headspace degassing apparatus for an oil-filled device according to an embodiment of the present disclosure.
Fig. 5 is a block schematic diagram of a signal processing unit of a headspace degassing device of an oil-filled device according to an embodiment of the present disclosure.
Fig. 6 is a schematic circuit diagram of a photoelectric conversion circuit in a signal processing unit of a headspace degassing device of an oil-filled device according to an embodiment of the present application.
Fig. 7 is a schematic circuit diagram of a first signal amplification circuit in a signal processing unit of a headspace degassing device of an oil-filled device according to an embodiment of the present application.
Fig. 8 is a schematic circuit diagram of a band-pass filter circuit in a signal processing unit of a headspace degassing device of an oil-filled device according to an embodiment of the present disclosure.
Fig. 9 is a schematic circuit diagram of a second signal amplification circuit in a signal processing unit of a headspace degassing device of an oil-filled device according to an embodiment of the present application.
Fig. 10 is a schematic circuit diagram of an a/D conversion circuit in a signal processing unit of a headspace degassing device of an oil-filled device according to an embodiment of the present application.
Fig. 11 is a schematic view of a first structure of a measurement unit according to an embodiment of the present application.
Fig. 12 is a schematic view of a second structure of a measurement unit according to an embodiment of the present application.
Fig. 13 is a schematic structural diagram of a third measurement unit according to an embodiment of the present application.
Fig. 14 is a schematic structural diagram of a temperature control module according to an embodiment of the present application.
FIG. 15 is a schematic diagram of a temperature regulating circuit in a temperature control module according to an embodiment of the present application
Fig. 16 is a schematic structural view of a headspace degassing device of an oil-filled apparatus according to the present application.
Fig. 17 is a structural diagram of an oil tank in the headspace degassing device of the oil-filled device according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic view of a scene of a monitoring system of an oil-immersed device 200 according to an embodiment of the present disclosure, where the monitoring system of the oil-immersed device 200 may include the oil-immersed device 200 and a headspace degassing device 100 of the oil-immersed device, and the headspace degassing device 100 of the oil-immersed device is connected to the oil-immersed device 200 through a pipeline.
In one embodiment, the oil-filled device 200 can include an oil-filled power transformer.
In an embodiment, the headspace degassing device 100 of the oil-filled apparatus may include an oil path unit 110, a degassing unit 120, an air path unit 130, a measurement unit 140, and a control unit 150, where the degassing unit 120 includes a degassing device. The headspace degassing device 100 of the oil-immersed equipment firstly sends a sampling enabling signal to the oil path unit 110 through the control unit 150, so that the oil path unit 110 obtains a cooling oil sample from the oil-immersed equipment 200; then the control unit 150 sends a degassing enable signal to the oil path unit 110 and the degassing unit 120 to control the cooling oil sample to flow from the oil path unit 110 to the degassing unit 120, and the degassing device in the degassing unit is used for stirring the cooling oil sample in the degassing unit within a preset liquid level height, so that the degassing unit 120 degasses the cooling oil sample to obtain a gas sample to be tested; then the control unit 150 sends measurement enabling signals to the degassing unit 120, the gas path unit 130 and the measurement unit 140 to control the gas sample to be measured to flow from the degassing unit 120 to the measurement unit 140 through the gas path unit 130, and control the photoacoustic spectroscopy device in the measurement unit 140 to measure the concentration of the characteristic gas in the gas sample to be measured respectively by using the narrow-bandwidth laser corresponding to the characteristic gas; then, the control unit 150 determines an operation fault of the oil-filled device 200 according to the concentration of the characteristic gas in the gas sample to be measured, which is obtained by the measurement unit 140.
It should be noted that the system scenario diagram shown in fig. 1 is an example, and the server and the scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person having ordinary skill in the art knows, with the evolution of the system and the occurrence of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.
Fig. 2 is a schematic flow diagram of a headspace degassing method for an oil-filled device according to an embodiment of the present application, and fig. 3 is a schematic structural diagram of a headspace degassing device for an oil-filled device according to the present application, please refer to fig. 2 and fig. 3, where the headspace degassing method for an oil-filled device includes the following steps:
s100: the control unit 150 sends a sampling enable signal to the oil path unit 110, so that the oil path unit 110 obtains a cooling oil sample from the oil-filled device 200.
In an embodiment, when the oil unit 110 obtains the cooling oil sample from the oil-filled device 200, the oil unit 110 may be controlled to obtain the cooling oil sample statistics from the oil-filled device 200 by disposing a valve and an oil pump 103 between the oil-filled device 200 and the oil unit 110. For example, when the control unit 150 sends the sampling enable signal to the oil circuit unit 110, a valve between the oil circuit unit 110 and the oil-filled device 200 is opened, the oil pump 103 pumps a cooling oil sample from the oil-filled device 200 into the oil circuit unit 110, and the volume of the cooling oil sample may be specifically defined according to the operation time of the oil pump 103, the operation power of the oil pump 103, and the like.
In one embodiment, after the oil path 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 in the cooling oil, such as solid particles or water, may be removed during the pretreatment, so as to improve the purity of the cooling oil sample.
In one embodiment, as shown in fig. 3, the cooling oil sample in the oil-filled device 200 enters the oil tank 210 in the degassing unit 120 through the first valve 101 in the oil path unit 110. The cooling oil sample in the oil tank 210 enters the oil-filled device 200 through the oil pump 103 and the second valve 102.
S200: the control unit 150 sends a degassing enable signal to the oil path unit 110 and the degassing unit 120 to control the cooling oil sample to flow from the oil path unit 110 to the degassing unit 120, and the degassing device is configured to stir the cooling oil sample in the degassing unit within a preset liquid level height, so that the degassing unit 120 degasses the cooling oil sample to obtain a gas sample to be tested.
In an embodiment, after obtaining the cooling oil sample, it is necessary to send the cooling oil sample from the oil path unit 110 to the degassing unit 120, the control unit 150 may send degassing enable signals to the oil path unit 110 and the degassing unit 120, so that the cooling oil sample enters the degassing unit 120 from the oil path unit 110, and at the same time, after the cooling oil sample enters the degassing unit 120, the degassing unit 120 separates the gas in the cooling oil sample to obtain the gas sample to be tested.
In one embodiment, when the degassing unit 120 is used to degas the cooling oil sample, the cooling oil sample may be degassed by headspace degassing. The mode of headspace degasification indicates that messenger's cooling oil sample gets into oil tank 210, with the gaseous discharge of oil tank 210 top, avoids original gas in the oil tank 210 to produce the influence to the gas sample that awaits measuring for form the negative pressure in the oil tank 210, then adopt to oil tank 210 bottom heating, carry out the mode of stirring to the cooling oil simultaneously, make the gas sample that awaits measuring in the cooling oil separate out.
Referring to fig. 3, in the first stage, the pressure in the oil tank 210 is mainly pumped to the first target pressure, so that a negative pressure is formed between the oil-filled device 200 and the oil tank 210, and the cooling oil sample in the oil-filled device 200 enters the oil tank 210. First, the control unit 150 controls the suction of the first driving motor 223 driving the piston 222 in the air extraction device 220 in the degassing unit 120 to draw the gas in the oil tank 210 into the cylinder 221 in the air extraction device 220, and discharges the gas in the cylinder 221 through the air passage unit 130 to form a negative pressure in the oil tank 210. The air path unit 130 includes a first air valve 310, a second air valve 320, a third air valve 330 and a fourth air valve 340. For example, the first port 311 and the second port 312 of the first gas valve 310 are communicated, the air pumping device 220 pumps part of the gas in the oil tank 210 into the cylinder 221, then the first port 311 and the third port 313 of the first gas valve 310 are communicated, and the gas in the cylinder 221 is exhausted through the third gas valve 330. The above steps are repeated so that the pressure in the oil tank 210 is reduced to a first target pressure, for example, the outside atmospheric pressure is 100Kpa, the first target pressure in the oil tank 210 may be 2Kpa, and the pressure in the oil tank 210 may be directly obtained by the pressure sensor 230.
In a second phase, a pressure difference between the oil tank 210 and the oil-filled device 200 causes a cooling oil sample inside the oil-filled device 200 to enter said oil tank 210. First, the control unit 150 controls the first valve 101 to open so as to communicate the oil-filled device 200 with the oil tank 210, and the cooling oil sample in the oil-filled device 200 enters the oil tank 210 due to a pressure difference between the oil-filled device 200 and the oil tank 210; when the cooling oil sample in the oil tank 210 reaches the height measured by the upper level sensor 211, the control unit 150 controls the first valve 101 to close. The height of the upper liquid level sensor 211 may be set according to the height of the oil tank 210, for example, the height of the upper liquid level sensor 211 may be set according to 75% of the height of the oil tank 210, or the height of the upper liquid level sensor 211 may 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 may 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 may be 70% of the height of the oil tank 210, so as to avoid that the liquid level height exceeds the critical height of the oil tank 210 when the cooling oil sample is stirred due to the excessively fast rotation speed of the stirring member 213; alternatively, the height of the upper liquid level sensor 211 may be set according to the stirring temperature of the cooling oil sample in the oil tank 210, and for example, when the stirring temperature of the cooling oil sample is 50 ℃, the height of the upper liquid level sensor 211 may be 75% of the height of the oil tank 210, and when the stirring temperature of the cooling oil sample is 70 ℃, the height of the upper liquid level sensor 211 may be 70% of the height of the oil tank 210.
In the third stage, the gas to be measured in the cooling oil sample enters the measurement unit 140 through the air pumping device 220 and the air path unit 130. Firstly, the control unit 150 controls the first port 311 and the second port 312 of the first air valve 310 to communicate, so that the air extraction device 220 communicates with the oil tank 210, then the control unit 150 controls the stirring member 213 to stir the cooling oil sample in the oil tank 210, then the air extraction device 220 extracts the gas to be measured in the cooling oil sample into the air cylinder 221 in the air extraction device 220, then the control unit 150 controls the first port 311 and the second port 312 of the first air valve 310 to be disconnected, and controls the first port 311 and the third port 313 of the first air valve 310 to communicate, opens the second air valve 320 and the fourth air valve 340, closes the third air valve 330, so that the gas to be measured enters the measurement unit 140 through the air path unit 130; next, the above steps are repeated until the pressure in the oil tank 210 reaches the second target pressure, the above air-extracting step is stopped, and the first air 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 defined according to actual conditions.
In a fourth phase, the cooling oil sample in the oil tank 210 is returned to the oil-filled device 200. First, the control unit 150 controls the second valve 102 to communicate the inside of the oil-filled device 200 with the oil tank 210, then controls the oil pump 103 to pump the cooling oil sample in the oil tank 210 into the oil-filled device 200, and 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 the second valve 102 to be closed. The height measured by the lower level sensor 212 may be the bottom end of the oil tank 210, and the specific position is not limited in detail in this application.
According to the operation process of the headspace degassing device 100 of the oil-immersed device, since the gas to be measured in the oil tank 210 needs to be degassed within the target degassing time, the stirring speed of the stirring member 213 directly affects the degassing rate of the gas to be measured. For sample oil with different viscosity or temperature and at different stirring speed, the degassing rate of the oil-gas separation device in the monitoring device for the running state of the gas to be detected in the sample oil separating from the oil-immersed device 200 is different. The running state monitoring device of the existing oil-immersed device 200 generally cannot accurately set the stirring speed of the stirring member 213 in the oil-gas separation device, so that the gas to be detected in the sample oil cannot be separated from the oil-gas separation device within a target time; secondly, the increase of the stirring speed also causes the increase of the liquid level of the cooling oil sample, and the excessively high liquid level causes the cooling oil sample to enter the measuring unit 140 from the oil tank 210 through the gas circuit unit 130, which not only affects the measuring result, but also causes the equipment to be damaged to a certain extent due to the existence of the cooling oil sample. In this embodiment, at least one degassing device 230 is disposed in the oil tank of the degassing unit, so that the gas to be measured in the cooling oil sample can pass through the degassing device, and the cooling oil sample cannot pass through the degassing device, that is, oil-gas separation is performed, thereby eliminating the technical problem of the excessive liquid level of the cooling oil sample due to the excessive stirring speed.
In one embodiment, since the stirring member 213 may form a vortex in the central region of the cooling oil sample while stirring the cooling oil sample, and the liquid level of the edge region of the cooling oil sample may increase, a larger safe rotation speed is reserved when stirring to avoid setting the stirring speed due to the excessively high liquid level; the faster the stirring speed, the faster the rate of the gas to be measured in the cooling oil sample leaving the degassing unit 120, and the smaller the stirring speed, the smaller the rate of the gas to be measured in the cooling oil sample leaving the degassing unit 120. Therefore, the limitation of the stirring speed prevents the gas to be measured in the cooling oil sample from escaping from the degassing unit 120 within the target degassing time; secondly, the speed limitation is often compensated by the increase in temperature, and the long-term exposure of the cooling oil sample to a higher stirring temperature may cause a certain degree of damage to the pipelines or other equipment of the oil-filled device.
Specifically, in this embodiment, at least one degassing device 230 may be disposed in the oil tank 210, and the liquid level height of the degassing device 230 is used as a safety height, so as to obtain a target stirring speed corresponding to a cooling oil sample with the same viscosity according to the safety height. This step may include: the control unit 150 controls the first sensor to obtain a first liquid level height of the cooling oil sample; acquiring the stirring speed of the stirring member 213; determining the viscosity of the cooling oil sample based on the first liquid level height and the stirring speed of the stirring member 213 according to the correlation among the liquid level height, the viscosity and the stirring speed; and determining the target stirring speed of the cooling oil sample based on the target liquid level height and the viscosity of the cooling oil sample according to the incidence relation among the liquid level height, the viscosity and the stirring speed.
In particular, the first sensor may be located on the degassing device 230, and the first sensor is located outside the degassing device 230. Because the inner circle of the cooling oil sample forms a vortex when the cooling oil sample is stirred, the first sensor cannot acquire an accurate liquid level, and the liquid level of the cooling oil sample positioned on the outer circle rises due to the stirring, and the liquid level is a real liquid level, so that the data acquired by arranging the first sensor on the outer side of the degassing device 230 is accurate. Secondly, the first sensor may be a distance sensor, which is mainly used to obtain the level height of the cooling oil sample. The number of the first sensors may be plural, and the first sensors are uniformly distributed outside the degassing device 230.
Specifically, the initial stirring speed of the stirring member 213 may be directly obtained according to the upper related parameters of the stirring member 213, and the setting of the initial stirring speed may be set according to historical data, predicted concentration, stirring resistance, or pressure variation in the oil tank 210, and the like, and the present application is not limited in detail. Secondly, in the incidence relation among the liquid level height, the viscosity and the stirring speed, under the condition that the stirring speed is not changed, the larger the viscosity of the cooling oil sample is, the smaller the liquid level height is, the smaller the viscosity of the cooling oil sample is, and the larger the liquid level height is; under the condition that the viscosity of the cooling oil sample is not changed, the higher the stirring speed is, the larger the liquid level height is, the lower the stirring speed is, and the larger the liquid level height is; under the condition that the liquid level height is unchanged, the higher the viscosity of the cooling oil sample is, the higher the required stirring speed is, and the lower the viscosity of the cooling oil sample is, the lower the required stirring speed is. According to the above relationship, the stirring speed is positively correlated with the liquid level height, which is inversely correlated with the viscosity, and with respect to the specific functional relationship of the three, which can be obtained from historical data or other empirical formulas, it is possible to determine the viscosity of the cooling oil sample while obtaining the determined first liquid level height and the stirring speed of the stirring member 213. And finally, determining the target stirring speed of the cooling oil sample based on the target liquid level height and the viscosity of the cooling oil sample according to the incidence relation among the liquid level height, the viscosity and the stirring speed. The target liquid level is a preset liquid level set by the degassing device 230, and a specific value of the preset liquid level can be defined according to the requirement of a customer.
This embodiment is through set up first sensor in order to acquire the liquid level height of cooling oil sample when the stirring on degasser 230, and through acquireing in real time the liquid level height of cooling oil sample acquires the best stirring speed of cooling oil sample, it not only can eliminate the cooling oil sample and can't improve the technical problem of stirring speed because of the restriction of liquid level height, and it can also reduce the stirring temperature of cooling oil sample through improving stirring speed, makes the gas that awaits measuring in the cooling oil sample can break away from degasification unit 120 in the target degasification time.
Specifically, the above embodiment corresponds to that the liquid level height of the cooling oil sample is smaller than or close to the preset liquid level height of the degassing device 230, and when the height of the cooling oil sample is equal to the preset liquid level height, the liquid level of the cooling oil sample cannot be raised continuously due to the existence of the degassing device 230, and the calculation is not accurate, and the step may include: judging whether the first liquid level height of the cooling oil sample is equal to the preset liquid level height or not; if the first liquid level height of the cooling oil sample is equal to the preset liquid level height, the control unit 150 controls the second sensor to obtain the vortex inner diameter between the central axis of the stirring member 213 and the cooling oil sample; determining the pressure to which the degassing device 230 is subjected based on the vortex inner diameter of the degassing device 230 and the viscosity of the cooling oil sample according to the correlation among viscosity, vortex inner diameter and pressure; determining whether the pressure experienced by the degassing device 230 is greater than a critical pressure of the degassing device 230; if the pressure applied to the degassing device 230 is greater than the critical pressure of the degassing device 230, determining a target stirring speed and a target stirring temperature of the cooling oil sample based on the pressure applied to the degassing device 230 according to the correlation among the pressure, the temperature and the stirring speed.
Specifically, the measuring unit 140 may further include a second sensor located on the degassing device 230, and the second sensor is configured to measure a distance between the central axis of the stirring member 213 and the cooling oil sample. Since the stirring speed is continuously increased when the liquid level reaches the preset liquid level when the cooling oil sample is stirred, and the vortex radius will be continuously increased, the second sensor is mainly configured to obtain the vortex inner diameter, and the pressure applied to the degassing device 230 by the cooling oil sample is determined according to the vortex radius. The larger the swirl inner diameter, the greater the corresponding stirring speed, and the greater the pressure that the cooling oil sample will exert on the degassing device 230. Thus, for the functional relationship of viscosity, vortex bore diameter, pressure, which may be obtained from historical data or other empirical formulas, based on the determined vortex bore diameter and the determined viscosity, the specific pressure applied by the cooling oil sample on the degasser 230 may be obtained.
Specifically, when the specific pressure acting on the degassing device 230 exceeds the critical pressure of the degassing device 230, it is equivalent to make the degassing device 230 in a dangerous state, for example, the impact of oil makes the degassing device 230 lose the effect of oil-gas separation, so that the pressure acting on the degassing device 230 for the cooling oil needs to be obtained in real time to avoid an irrecoverable accident. Secondly, when the pressure acting on the degassing device 230 is greater than the critical pressure, the temperature and stirring speed of the cooling oil sample need to be adjusted while ensuring that the degassing rate of the gas to be measured is constant. Since the influence of the stirring speed on the liquid level height of the cooling oil sample is greater than the influence of the temperature on the liquid level height of the cooling oil sample, the stirring speed should be preferentially reduced and the stirring temperature should be preferentially increased during adjustment.
In the embodiment, the second sensor is arranged on the stirring member 213 to obtain the vortex radius of the cooling oil sample in real time, and the pressure applied to the degassing device 230 by the cooling oil sample is obtained according to the size of the vortex radius, and the pressure obtained in real time is compared with the critical pressure of the degassing device 230 to determine whether the pressure of the cooling oil sample on the degassing device 230 is greater than the critical pressure, when the pressure of the cooling oil sample on the degassing device 230 is greater than the critical pressure, the liquid level height needs to be adjusted by reducing the stirring speed of the stirring member 213 and the stirring temperature of the cooling oil sample, which can eliminate the technical problem that the stirring speed of the cooling oil sample cannot be increased due to the limitation of the liquid level height, so that the gas to be measured in the cooling oil sample can be separated from the degassing unit 120 within the target degassing time.
In one embodiment, when the degassing device 230 is subjected to a pressure greater than the critical pressure of the degassing device 230, the correlation between the pressure, the temperature and the stirring speed is mainly based on the relationship between the target pressure and the liquid level height, so as to reduce the liquid level height to a second liquid level height corresponding to the target pressure, and the step may include: if the degassing device 230 is subjected to a pressure greater than the critical pressure of the degassing device 230, determining a second liquid level height of the cooling oil sample based on the target pressure of the degassing device 230 according to the correlation between the pressure and the liquid level height; and determining a target stirring speed and a target stirring temperature of the cooling oil sample based on the second liquid level height and the viscosity of the cooling oil sample according to the correlation among the liquid level height, the temperature and the stirring speed.
Specifically, the second liquid level is a virtual height, that is, a preset height that can be reached by cooling the oil sample at a corresponding stirring speed when the degassing device 230 is not present, and the second liquid level is higher when the pressure is higher, and the second liquid level are in positive correlation. And finally, determining the target stirring speed of the cooling oil sample based on the obtained second liquid level height and the viscosity of the cooling oil sample according to the obtained correlation among the liquid level height, the viscosity and the stirring speed.
In this embodiment, the critical pressure of the degassing device 230 is obtained to obtain a second liquid level corresponding to the critical pressure, and according to the correlation among the liquid level, the temperature and the stirring speed, a target stirring speed and a target stirring temperature are obtained, and the gas to be measured in the cooling oil sample can be separated from the degassing unit 120 within the target degassing time under the condition that the pressure applied to the degassing device 230 by the cooling oil sample does not exceed the critical pressure by jointly adjusting the stirring speed and the stirring temperature.
In an embodiment, when the first liquid level height of the cooling oil sample is equal to the preset liquid level height, the cooling oil sample applies a force to the degassing device 230, and if the force is greater than the critical value of the degassing device 230, the degassing device 230 may lose the efficiency of oil-gas separation, so that the embodiment provides a covering device on the degassing device 230, that is, simultaneously blocks the permeation of gas and oil, so that the gas is separated from the degassing device 230 through the region corresponding to the vortex center of the cooling oil sample, and the step may include: acquiring position information of a contact region of the degassing device 230, which is in contact with the cooling oil sample; based on the position information of the contact area, the control unit 150 controls a covering device located in the degassing device 230 to cover the contact area, so that the gas to be measured in the cooling oil sample enters the measurement unit 140 from an area of the degassing device 230 not covered by the covering device.
Specifically, when the cooling oil sample is stirred, the central region may generate vortex, the liquid level in the edge region may increase to impact the degassing device 230, and the edge region may generate impact force larger than the critical pressure, so that the cooling oil sample may penetrate through the degassing device 230 from the edge region. The provision of the cover means precludes the possibility of the cooling oil sample penetrating the degassing means 230. Secondly, the central area of the cover means is provided with an opening, so that the gas to be measured in the cooling oil sample can escape from the degassing means 230 through the opening into the measurement cell 140.
In the embodiment, the degassing device 230 is arranged in the edge area of the degassing device 230, so that the technical problem that the cooling oil sample permeates into the degassing device 230 due to overhigh pressure of the cooling oil sample is solved, the safety of the degassing device 230 is improved, the technical problem that the stirring speed of the cooling oil sample cannot be increased due to the limitation of the liquid level height can be solved, and the gas to be detected in the cooling oil sample can be separated from the degassing unit 120 within the target degassing time.
In one embodiment, when the height of the cooling oil sample is equal to the preset level height, the level of the cooling oil sample cannot be further increased due to the presence of the degassing device 230, and the calculation is inaccurate, which can avoid the technical problem that the pressure applied by the cooling oil sample to the degassing device 230 exceeds the critical pressure by adjusting the level height of the degassing device 230, and this step can include: judging whether the first liquid level height of the cooling oil sample is equal to the preset liquid level height or not; if the first liquid level height of the cooling oil sample is equal to the preset liquid level height, the control unit 150 controls the third sensor to obtain the pressure applied by the degassing device 230 by the cooling oil sample; determining whether the pressure experienced by the degassing device 230 is greater than a critical pressure of the degassing device 230; if the degassing device 230 is subjected to a pressure greater than the critical pressure of the degassing device 230, the control module controls the degassing device 230 to move away from the cooling oil sample.
In particular, the measuring unit 140 may further comprise a third sensor located in the oil tank 210, the third sensor being configured to measure the pressure to which the degassing device 230 is subjected. Since the stirring speed will continuously increase when the liquid level reaches the preset liquid level while the cooling oil sample is being stirred, the vortex radius will continue to increase, and therefore the third sensor is mainly configured to obtain the actual force applied by the cooling oil sample to the degassing device 230. And when the force is larger than the critical pressure of the degassing device 230, the force of the cooling oil sample on the degassing device is reduced by adjusting the height of the liquid level of the degassing device 230 in the oil tank 210.
In the embodiment, the third sensor is arranged on the degassing device 230 to obtain the acting force of the cooling oil sample on the degassing device 230 in real time, and the acting force is compared with the critical pressure of the degassing device 230, so that the degassing device 230 can be movably adjusted, the technical problem that the cooling oil sample permeates into the degassing device 230 due to overhigh pressure of the cooling oil sample is solved, the safety of the degassing device 230 is improved, the technical problem that the stirring speed of the cooling oil sample cannot be increased due to the limitation of the liquid level height can be solved, and the gas to be measured in the cooling oil sample can be separated from the degassing unit 120 within the target degassing time.
S300: the control unit 150 sends measurement enabling signals to the degassing unit 120, the gas path unit 130 and the measurement unit 140 to control the gas sample to be measured to flow from the degassing unit 120 to the measurement unit 140 through the gas path unit 130, and control the photoacoustic spectroscopy device in the measurement unit 140 to measure the concentration of the characteristic gas in the gas sample to be measured respectively by using the narrow-bandwidth laser corresponding to the characteristic gas;
in an embodiment, after obtaining the gas sample to be measured, the concentration of the characteristic gas in the gas sample to be measured needs to be measured, the control unit 150 may send a measurement enable signal to the degassing unit 120, the gas path unit 130, and the measurement unit 140, so that the gas to be measured flows from the degassing unit 120 into the gas path unit 130, and then flows from the gas path unit 130 into the measurement unit 140, and the photoacoustic spectroscopy device in the measurement unit 140 measures the concentration of the characteristic gas to obtain the concentration of each characteristic gas.
In one embodiment, after the gas sample to be tested flows into the gas path unit 130 from the degassing unit 120, the gas sample to be tested is pretreated, and considering that the gas sample to be tested may contain water, the gas sample to be tested may be dried, so that the water does not affect the test of the gas sample to be tested.
In one embodiment, the characteristic gas refers to a gas separated from the cooling oil that causes a failure of oil-filled device 200, different types of characteristic gases having different concentrations, different types of operational failures of oil-filled device 200, and when the concentration of the different types of characteristic gases is low, the operation failure of the oil-filled device 200 does not occur, but by predicting the different types of characteristic gases, thereby predicting the operation failure of oil-filled device 200, and the characteristic gas causing the failure of oil-filled device 200 includes hydrogen, carbon monoxide, methane, acetylene, ethylene, carbon dioxide, ethane, when measuring the concentration of the characteristic gas in the gas to be measured, only one of the characteristic gases may be present, that is, only one of the characteristic gases has a concentration greater than 0, and the other characteristic gases have a concentration of 0.
In one embodiment, the characteristic gas may be any one of methane, ethane, ethylene, acetylene, carbon monoxide, carbon dioxide and hydrogen, and when the gas sample to be measured is measured, the concentration of all kinds of characteristic gases in the gas sample to be measured needs to be measured; the standard gas sample comprises methane, ethane, ethylene, acetylene, carbon monoxide, carbon dioxide, hydrogen and other gases, and the standard concentration of the characteristic gas in the standard gas sample is a known concentration.
In an embodiment, since the gas to be measured generally includes hydrogen, and the concentration of hydrogen can be directly obtained from the cooling oil sample by a corresponding measuring tool, and then the predicted concentration of the gas to be measured in the current measuring period is obtained from the proportional relationship between hydrogen and the concentration of the gas to be measured in the historical data, so as to determine the stirring speed of the stirring member 213, this step may include: controlling the measuring unit 140 to obtain the current concentration of hydrogen in the cooling oil sample; acquiring a proportional relation between the hydrogen concentration and the concentration of the gas to be detected in historical data, and determining the predicted concentration of the gas to be detected based on the current concentration of the hydrogen; and determining the first stirring speed based on the predicted concentration and the target degassing time according to the correlation among the concentration, the degassing time and the stirring speed.
Specifically, the hydrogen concentration can be directly obtained in the cooling oil sample by a specific measuring device due to the characteristics of hydrogen itself. For example, it may control the symmetric gas measurement device in the measurement unit 140 to dip the cooling oil sample in the degassing unit 120 using a symmetric gas absorption member to measure to obtain the current concentration of hydrogen gas before the degassing unit 120 degasses the cooling oil sample.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a symmetrical gas measurement device of a headspace degassing apparatus of an oil-filled device according to an embodiment of the present application, where the symmetrical gas measurement device 600 includes: a symmetric gas absorbing member 620 for absorbing a symmetric gas in the cooling oil sample, the photosensitivity of the symmetric gas absorbing member 620 being related to the concentration of the symmetric gas absorbed by the symmetric gas absorbing member 620; a laser emitting unit 610 for emitting a first optical signal to the symmetric gas absorption member 620; a signal collection unit 630, configured to receive a second optical signal reflected back from the first optical signal after the symmetric gas absorption member 620 absorbs the symmetric gas; and the signal processing unit 640 is used for determining the concentration of the symmetrical gas in the cooling oil sample according to the change values of the second optical signal and the first optical signal.
Further, the signal processing unit 640 is configured to determine a concentration of the symmetric gas absorbed by the symmetric gas absorption member 620 according to the phase change value of the second optical signal and the first optical signal, and determine a concentration of the symmetric gas in the cooling oil sample according to the concentration of the symmetric gas absorbed by the symmetric gas absorption member 620. The signal processing unit 640 feeds back a phase change value between the first optical signal and the second optical signal and a concentration of the symmetric gas absorbed by the symmetric gas absorption member 620 through the signal processing circuit.
In one embodiment, the signal processing unit 640 first converts the first optical signal and the second optical signal into a first analog signal and a second analog signal according to the phase change values of the first optical signal continuously emitted from the laser emission unit 610 to the symmetric gas absorption member 620 or the first optical signal emitted to the symmetric gas absorption member 620 at a preset frequency interval and the second optical signal reflected back by the symmetric gas absorption member 620, and feeds back the phase difference between the first optical signal and the second optical 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 the phase difference signal into the concentration of the symmetric gas absorbed by the symmetric gas absorption member 620, so that a user can determine the concentration of the symmetric gas in the cooling oil sample according to the concentration of the symmetric gas absorbed by the symmetric gas absorption member 620.
In an embodiment, the symmetric gas measuring device 600 further includes a monitoring unit 631, where the monitoring unit 631 is configured to monitor a phase change of the second optical signal, and trigger the signal processing unit 640 to calculate a phase change value of the second optical signal and the first optical signal after monitoring that the phase change value of the second optical signal is smaller than a preset value for a preset time, and specifically, when the monitoring unit monitors that the phase change value of the second optical signal is smaller than the preset value for the preset time, it indicates that the concentration of the symmetric gas absorbed by the surface of the symmetric gas measuring device 600 placed in the cooling oil sample has already reached a stable state, and may trigger the signal processing unit 640 to calculate the phase change value of the second optical signal and the first optical signal.
Referring to fig. 4, the signal acquisition unit 630 of the symmetrical gas measurement device 600 further includes a first reset unit 632, and the first reset unit 632 is configured to delete and reset data detected at the previous time before each detection is completed or the next detection is started, so as to ensure the accuracy of the next detection data.
In an embodiment, the signal processing unit 640 in the symmetric gas measurement device 600 further includes a second reset unit 641, where the second reset unit 641 is also configured to delete and reset the data detected at the previous time before each detection is finished or the next detection is started, so as to ensure the accuracy of the data detected at the next time.
In one embodiment, the symmetric gas absorbing member 620 comprises a laser fiber sensor with at least one palladium-nickel alloy film plated on the surface.
Specifically, the palladium-nickel alloy may function to absorb only hydrogen, and the palladium-nickel alloy film coated on the surface of the symmetric gas absorption member 620 may be directly used to measure the concentration of the symmetric gas in the cooling oil sample.
In one embodiment, the palladium-nickel alloy film on the surface of the symmetric gas absorption member 620 has a thickness in the range of 10-400 um.
Referring to fig. 5, fig. 5 is a schematic block diagram of a signal processing unit 640 of a headspace degassing device of an oil-immersed device according to an embodiment of the present disclosure; the signal processing circuit mainly comprises: the photoelectric conversion circuit 61, the first signal amplifying circuit 62, the band-pass filter circuit 63, the second signal amplifying circuit 64 and the A/D conversion circuit 65, wherein 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 band-pass filter circuit 63, the output end of the band-pass filter 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.
Referring to fig. 6 to 10, the signal processing circuit includes:
the photoelectric conversion circuit 61 is configured to convert the optical signal into an electrical signal, where the electrical signal is an analog signal, and the photoelectric conversion circuit 61 includes a first integrated circuit, and the first integrated circuit and each circuit element together convert a phase change between the first optical signal and the second optical signal into a phase change before and after the analog signal, and then the phase change before and after the analog signal is processed by a subsequent circuit unit, so as to finally convert the phase change before and after the analog signal into a symmetric gas concentration absorbed by the symmetric gas absorption member 620.
The first signal amplifying circuit 62 and the first signal amplifying circuit 62 are connected to the output end of the photoelectric conversion circuit 61, and are configured to amplify the analog quantities of the first optical signal and the second optical signal received or reflected by the symmetric gas absorption member 620.
The input end of the band-pass filter circuit 63 is connected with the output end of the first signal amplifying circuit 62, the band-pass filter circuit 63 is used for filtering signals output by the first signal amplifying circuit 62, the purpose of the band-pass filter circuit 63 is to filter useless high-frequency and low-frequency signals and extract useful intermediate-frequency signals, and the band-pass filter circuit 63 adopts a second integrated circuit.
The input end of the second signal amplifying circuit 64 is connected with the output end of the band-pass filter circuit 63, the output signal of the band-pass filter circuit 63 is amplified and transmitted to the A/D conversion circuit 65, which is equivalent to a secondary signal amplification, so as to enable the signal obtained by the A/D conversion circuit 65 to be more accurate and more convenient to convert, and the second signal amplifying circuit 64 also adopts a second integrated circuit.
An input end of the a/D conversion circuit 65 is connected to an output end of the second signal amplification circuit 64, and is configured to convert an analog quantity output by the second signal amplification circuit 64 into a digital quantity, that is, a process of changing a discrete quantity into a continuous quantity, and transmit the obtained digital quantity to the concentration adjustment unit, where the a/D conversion circuit 65 is a third integrated circuit.
Referring to fig. 11, fig. 11 is a schematic view of a first structure of a measurement unit according to an embodiment of the present disclosure, in which the measurement unit 140 includes a plurality of detection units 51 that are not interfered with each other.
Specifically, the gas circuit unit 130 is configured to control the gas sample to be detected to flow from the gas circuit unit 130 to all the detection units 51 according to the measurement enabling signal.
The detection unit 51 is configured to measure the concentration of the characteristic gas to be measured by the detection unit 51 using a narrow-bandwidth laser corresponding to the characteristic gas according to the measurement enable signal.
The characteristic gas to be measured by the detection unit 51 refers to the characteristic gas to be measured by the detection unit 51; the detection unit 51 controls the photoacoustic spectroscopy device in the detection unit 51 to use a narrow-bandwidth laser corresponding to the characteristic gas to be measured by the detection unit 51 according to the measurement enable signal.
It should be noted that each of the detecting units 51 can independently realize the measurement of one kind of characteristic gas, the gas sample to be measured is flushed into the detecting units 51, the characteristic gas in the gas sample to be measured can be simultaneously measured by the detecting units 51 without interfering with each other, different kinds of characteristic gas correspond to the narrow-bandwidth lasers with different wavelengths, different detecting units 51 can use the narrow-bandwidth lasers with different wavelengths to measure different kinds of characteristic gas in the gas sample to be measured, and therefore the concentrations of various kinds of characteristic gas in the gas sample to be measured can be measured simultaneously.
In one embodiment, a plurality of the detecting units 51 are connected in series, which can also be understood as a plurality of the detecting units 51 are connected in cascade; the gas circuit unit 130 is configured to control the gas sample to be detected to sequentially flow into all the detection units 51 from the gas circuit unit 130 according to the measurement enabling signal.
The two adjacent detection units 51 are communicated through a connecting pipe 513, and a valve is arranged on the connecting pipe 513, so that a gas sample to be detected can flow into the detection units 51 in sequence, and meanwhile, the mutual interference among all the detection units 51 can be ensured.
It should be noted that each detection unit 51 is provided with an air inlet 511b and an air outlet 511c, when the measurement 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 may also be communicated with the air path unit 130 through a connection pipe 513 provided with a valve, so as to be used for accessing the gas sample to be detected flowing out of the air path unit 130; after the gas sample to be detected flows into the first-stage detection unit 51, the gas sample to be detected sequentially flows into all the detection units 51 through the connecting pipe 513; the gas outlet 511c of the detection unit 51 at the last stage may also be communicated with the gas path unit 130 through a connecting pipe 513 provided with a valve, so as to allow the measured gas sample to flow into the gas path unit 130 from the detection unit 51, and the measured gas sample to be detected is discharged after being processed by the gas path unit 130, thereby preventing the gas to be detected from polluting the environment.
The air inlet 511b and the air outlet 511c may be located on the same side of the detection units 51, so that the detection units 51 of two adjacent stages are communicated with each other through a connecting pipe 513.
Referring to fig. 12, fig. 12 is a schematic view illustrating a second structure of a measurement unit according to an embodiment of the present disclosure.
In one embodiment, the measurement unit 140 further includes a box 514, and all the detection units 51 are disposed in the box 514.
In one embodiment, the chassis may be a square structure, a plurality of slide rails 515 for supporting the detection unit 51 are disposed on an inner wall of the chassis, the plurality of slide rails 515 are arranged at intervals along a height direction of the chassis, and the detection units 51 correspond to the slide rails 515 one by one; the detection unit 51 is connected with the slide rail 515 in a sliding manner along the length direction of the slide rail 515, so that the detection unit 51 can be conveniently overhauled and replaced, if one detection unit 51 fails, a worker can pull the detection unit 51 out of the chassis for overhauling, and when the detection unit 51 cannot be repaired, the detection unit 51 with a normal function can be used for replacing the detection unit 51 with a failure, so that the measurement unit 140 cannot work when a single detection unit 51 fails.
In an 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, the detection unit 51 is provided with a connector 517 matched with the interface 516, and the connector 517 is inserted into the interface 516. An information interaction bridge is built through the butt joint of the interface 516 and the joint 517, so that the information interaction between the control unit 150 and the detection unit 51 is realized, and the control of the control unit 150 on the detection unit 51 and the information feedback of the detection unit 51 on the control unit 150 are realized.
Referring to fig. 13, fig. 13 is a schematic diagram illustrating a third structure of a measurement unit according to an embodiment of the present disclosure.
The detection unit 51 includes a photoacoustic cell 511 and a microphone 512 provided in the photoacoustic cell 511.
Wherein the photoacoustic cell 511 is used for accommodating the gas sample to be detected, and the photoacoustic cell 511 can be a resonant photoacoustic cell 511 for improving the detection sensitivity of the photoacoustic cell 511; the microphone 512 is used for detecting the photoacoustic signal generated after the narrow bandwidth laser is absorbed by the characteristic gas in the gas sample to be detected, and the microphone 512 can convert the acoustic signal generated after the narrow bandwidth laser is absorbed by the characteristic gas in the gas sample to be detected into an analog signal.
Specifically, the photoacoustic cell 511 and the microphone 512 form a photoacoustic spectroscopic device in the detection unit 51.
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 communicated with the resonant cavity 511 a. When the gas sample to be measured is measured, the gas sample to be measured enters the resonant cavity 511a from the gas inlet 511 b.
Specifically, the photoacoustic cell 511 further includes a transparent window 511d, and the narrow bandwidth laser light enters the resonant cavity 511a through the transparent window 511 d.
In one embodiment, each of the detection units 51 is configured to measure the concentration of a characteristic gas.
When a gas sample is measured, one detection unit 51 is only used for measuring the concentration of one characteristic gas in the gas sample, 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 with a corresponding wavelength according to the type of the characteristic gas to be measured by the detection unit 51.
Specifically, all the detection units 51 may perform measurement simultaneously, and all the detection units 51 may be used to measure the concentrations of different types of characteristic gases at the same time period, so as to improve the detection efficiency; it is also possible to detect the concentration of the same characteristic gas at the same time period using two or even more detection units 51 to obtain a plurality of concentration detection results of the same characteristic gas and compare the plurality of concentration detection results to ensure the accuracy of the concentration detection results.
Specifically, the time period refers to a time period required for measuring the concentration of one characteristic gas.
In one embodiment, each detection unit 51 includes a separate laser 52, the laser 52 is configured to emit a narrow bandwidth laser according to the emission enable signal sent by the control unit 150, and the laser 52 may be a narrow bandwidth laser, such as a DFB laser.
Wherein, all the detecting units 51 can be used to output the narrow-bandwidth laser light corresponding to each characteristic gas by using the corresponding laser 52 to measure the concentration of the corresponding characteristic gas, so as to improve the detecting efficiency.
Referring to fig. 14 and 15, fig. 14 is a schematic structural diagram of a temperature control module provided in the embodiment of the present application, and fig. 15 is a schematic diagram of a temperature adjusting circuit in the temperature control module provided in the embodiment of the present application.
In one embodiment, the measurement unit 140 further includes a temperature control module for regulating the temperature of the laser diode. Specifically, the temperature control module comprises a voltage controller 721, a voltage stabilizer 722, a voltage comparator 723, a micro-program controller 724 and a temperature regulator 725, wherein the voltage controller 721, the voltage stabilizer 722, the voltage comparator 723 and the micro-program controller 724 form a temperature regulating circuit 720 of the temperature regulating module.
The voltage controller 721 is configured to provide a reference voltage, where the reference voltage is a preset optimal value of an 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 may emit a narrow-bandwidth laser with a specific frequency and power, and is used for detecting the concentration of the characteristic gas in the gas sample to be measured, so that the measurement accuracy and the sensitivity of the measurement unit 140 are both optimal; furthermore, the closer the effective operating voltage of the laser diode is to the reference voltage, the higher the accuracy and sensitivity of the measurement unit 140 to the characteristic gas concentration measurement. The input terminal of the voltage stabilizer 722 is electrically connected to the output terminal of the voltage controller 721, and is configured to stabilize the reference voltage provided by the voltage controller 721, eliminate fluctuation of the reference voltage, and improve stability and consistency of the reference voltage. A first input terminal of the voltage comparator 723 is electrically connected to the output terminal of the voltage stabilizer 722, a second input terminal of the voltage comparator 723 is electrically connected to the output terminal of the third voltage obtaining module 710, and the voltage comparator 723 is configured 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 micro-program controller 724. The input end of the micro-program controller 724 is electrically connected with the output end of the voltage comparator 723, and is used for receiving and analyzing the comparison result and sending a corresponding temperature regulation instruction to the temperature regulator 725 according to the comparison result.
Specifically, when the comparison result is that the effective working voltage of the laser diode is less than the reference voltage, the micro-program controller 724 sends a temperature adjustment instruction for reducing the temperature of the laser diode to the temperature adjuster 725; when the comparison result is that the effective working voltage of the laser diode is greater than the reference voltage, the micro-program controller 724 sends a temperature adjusting instruction for increasing the temperature of the laser diode to the temperature adjuster 725; when the comparison result is that the effective working voltage of the laser diode is equal to the reference voltage, the micro-program controller 724 sends a temperature adjusting instruction for maintaining the temperature of the laser diode to the temperature adjuster 725. The input end of the temperature regulator 725 is electrically connected to the output end of the micro-program controller 724, and is configured to regulate and control the temperature of the laser diode under the control of the temperature regulating instruction, so that the laser diode works within a preset temperature range.
S400: the control unit 150 determines an operation fault of the oil-immersed device 200 according to the concentration of the characteristic gas in the gas sample to be measured, which is obtained by the measurement unit 140.
In one embodiment, since the characteristic gas that causes the oil-filled device 200 to malfunction may include hydrogen, carbon monoxide, methane, acetylene, ethylene, carbon dioxide, and ethane, when the concentration of the characteristic gas in the gas to be measured is measured, only one of the characteristic gases may be present, that is, only one of the characteristic gases has a concentration greater than 0, and the other characteristic gases have a concentration of 0. The oil-immersed device 200 corresponds to different fault types, and the types of the characteristic gases measured from the gas sample to be measured are different, for example, when the fault type is that the cooling oil is overheated, the types of the corresponding characteristic gases 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 partial discharge in cooling oil and paper insulation, the types of corresponding characteristic gases are hydrogen, carbon monoxide, carbon dioxide, acetylene, methane and ethane; when the fault type is spark discharge in the cooling oil, the corresponding characteristic gas is hydrogen and acetylene; when the fault type is arc discharge in cooling oil, the corresponding characteristic gas is hydrogen, acetylene, ethylene, methane and ethane; when the fault type is arc discharge in cooling oil and paper, the corresponding characteristic gas is hydrogen, carbon monoxide, carbon dioxide, acetylene, ethylene, methane and ethane; when the fault type is that the paper is wet or the cooling oil has bubbles, the corresponding characteristic gas is hydrogen.
The embodiment of the application provides a headspace degassing method for an operating state of an oil-immersed device 200, the headspace degassing method for the operating state of the oil-immersed device 200 obtains a cooling oil sample from the oil-immersed device 200, carries out degassing treatment on the cooling oil sample to obtain a gas sample to be detected, measures the concentration of a characteristic gas in the gas sample to be detected, determines an operating fault of the oil-immersed device 200 according to the concentration of the characteristic gas, realizes that a headspace degassing device 100 of the oil-immersed device obtains sampling data in real time, can predict the operating fault of the oil-immersed device 200 according to the concentration of the characteristic gas and gives an alarm, and avoids damage to the oil-immersed device 200; meanwhile, the degassing device in the degassing unit is used for stirring the cooling oil sample in the degassing unit in a preset liquid level height, so that the degassing unit is used for degassing the cooling oil sample to obtain a gas sample to be detected, the stirring component does not need to consider the technical problem that the liquid level height of the cooling oil sample is too high due to too high stirring speed in the stirring process, the gas sample to be detected is separated from the degassing unit in the target degassing time, the detection period is shortened, the detection efficiency is improved, and the technical problem that the stirring speed of the stirring component in the oil-gas separation equipment cannot be accurately set by the headspace degassing equipment of the existing oil-immersed equipment is solved.
Referring to fig. 16, fig. 16 is a structural diagram of a headspace degassing device of an oil-immersed apparatus according to the present invention, where the headspace degassing device includes an oil path unit 410, a degassing unit 420, an air path unit 430, a measurement unit 440, and a control unit 450, and the degassing unit 420 includes a degassing device 230;
the control unit 450 is configured to send a sampling enable signal to the oil path unit 410 at a first time, so that the oil path unit 410 obtains a cooling oil sample from an oil-immersed device;
the control unit 450 is further configured to send a degassing enable signal to the oil path unit 410 and the degassing unit 420 at a second time to control the cooling oil sample to flow from the oil path unit 410 to the degassing unit 420, and the degassing device 230 is configured to stir the cooling oil sample in the degassing unit 420 within a preset liquid level height, so that the degassing unit 420 degasses the cooling oil sample to obtain a gas sample to be tested;
the control unit 450 is further configured to send a measurement enable signal to the degassing unit 420, the gas path unit 430, and the measurement unit 440 at a third time, so as to control the gas sample to be measured to flow from the degassing unit 420 to the measurement unit 440 through the gas path unit 430, and control the photoacoustic spectroscopy device in the measurement unit 440 to measure the concentrations of the characteristic gases in the gas sample to be measured respectively by using narrow-bandwidth laser light corresponding to the characteristic gases;
the control unit 450 is further configured to determine, at a fourth time, an operation fault of the oil-immersed device according to the concentration of the characteristic gas in the gas sample to be measured, which is obtained by the measurement unit 440.
In one embodiment, the measuring unit 440 comprises a first sensor located on the degassing device 230 for measuring the level of the cooling oil sample. The degassing unit 420 is further used for the control unit 450 to control the first sensor to obtain a first liquid level height of the cooling oil sample; acquiring the stirring speed of the stirring member; determining the viscosity of the cooling oil sample based on the first liquid level height and the stirring speed of the stirring member according to the correlation among the liquid level height, the viscosity and the stirring speed; and determining the target stirring speed of the cooling oil sample based on the target liquid level height and the viscosity of the cooling oil sample according to the incidence relation among the liquid level height, the viscosity and the stirring speed.
In one embodiment, the measuring unit 440 includes a second sensor on the degassing device 230 for measuring the distance between the stirring member central axis and the cooling oil sample. The degassing unit 420 is further configured to determine whether the first liquid level height of the cooling oil sample is equal to the preset liquid level height; if the first liquid level height of the cooling oil sample is equal to the preset liquid level height, the control unit 450 controls the second sensor to obtain the vortex inner diameter between the central shaft of the stirring member and the cooling oil sample; determining the pressure to which the degassing device 230 is subjected based on the vortex inner diameter of the degassing device 230 and the viscosity of the cooling oil sample according to the correlation among viscosity, vortex inner diameter and pressure; determining whether the pressure experienced by the degassing device 230 is greater than a critical pressure of the degassing device 230; if the pressure applied to the degassing device 230 is greater than the critical pressure of the degassing device 230, determining a target stirring speed and a target stirring temperature of the cooling oil sample based on the pressure applied to the degassing device 230 according to the correlation among the pressure, the temperature and the stirring speed.
In one embodiment, the degassing unit 420 is further configured to determine a second liquid level height of the cooling oil sample based on the target pressure of the degassing device 230 according to the correlation between the pressure and the liquid level height if the degassing device 230 is subjected to a pressure greater than the critical pressure of the degassing device 230; and determining a target stirring speed and a target stirring temperature of the cooling oil sample based on the second liquid level height and the viscosity of the cooling oil sample according to the correlation among the liquid level height, the temperature and the stirring speed.
In one embodiment, the degassing unit 420 is further configured to obtain position information of a contact area of the degassing device 230 that is in contact with the cooling oil sample; based on the position information of the contact area, the control unit 450 controls a covering device located in the degassing device 230 to cover the contact area, so that the gas to be measured in the cooling oil sample enters the measuring unit 440 from an area of the degassing device 230 not covered by the covering device. The measuring unit 440 comprises a third sensor located on the degassing device 230 for measuring the pressure to which the degassing device 230 is subjected.
In one embodiment, the measurement unit 440 includes a third sensor located on the degassing device 230 for measuring the pressure to which the degassing device 230 is subjected. The degassing unit 420 is further configured to determine whether the first liquid level height of the cooling oil sample is equal to the preset liquid level height; if the first liquid level height of the cooling oil sample is equal to the preset liquid level height, the control unit 450 controls the third sensor to acquire the pressure applied by the degassing device 230 by the cooling oil sample; determining whether the pressure experienced by the degassing device 230 is greater than a critical pressure of the degassing device 230; if the degassing device 230 is subjected to a pressure greater than the critical pressure of the degassing device 230, the control module controls the degassing device 230 to move away from the cooling oil sample.
Referring to fig. 17, fig. 17 is a structural diagram of an oil tank in a headspace degassing device of an oil-immersed device according to the present application.
In one embodiment, the degassing unit 420 comprises at least a first degassing device 231 disposed proximate to the cooling oil sample and a second degassing device 232 disposed distal to the cooling oil sample; the first degassing device 231 comprises a first degassing film 2311 and a first covering device 2312 located on one side of the first degassing film 2311, the first covering device 2312 is located near one side of the cooling oil sample, the first covering device 2312 is used for isolating the cooling oil sample and the gas to be tested in the cooling oil sample from the first degassing device 231 in the first degassing, and the first covering device 2312 comprises a first opening 2313 corresponding to the central area of the first degassing film 2311; the second degassing device 232 includes a second degassing membrane 2321 and a second covering device 2322 located on one side of the second degassing membrane 2321, the second covering device 2322 is located near one side of the cooling oil sample, the second covering device 2322 is used for isolating the cooling oil sample and the gas to be tested in the cooling oil sample from the second degassing device 232 in the second degassing, the second covering device 2322 corresponds to the first opening 2313, and the second covering device 2322 includes a second opening 2323 located at the outer ring of the second covering device 2322; the first opening 2313 is used for allowing the gas to be measured in the cooling oil sample to penetrate through the first degassing film 2311, the second opening 2323 is used for allowing the gas to be measured to penetrate through the second degassing film 2321, and the first covering device 2312 and the second covering device 2322 are overlapped.
In one embodiment, the first capping device 2312 is embedded within the degassing unit 420, and the first capping device 2312 is telescopically coupled to the degassing unit 420.
In one embodiment, the degassing unit 420 further comprises at least a first gas flow homogenizing plate, a second gas flow homogenizing plate, and a third gas flow homogenizing plate on the second degassing device 232; the first airflow homogenizing plate is provided with a plurality of first through holes, the second airflow homogenizing plate is provided with a plurality of second through holes, the third airflow homogenizing plate is provided with a plurality of third through holes, the aperture of the first through hole is larger than that of the second through hole, and the aperture of the second through hole is larger than that of the third through hole.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The headspace degassing method and device for the oil-immersed device provided by the embodiments of the present application are described in detail above, and the principle and the implementation manner of the present application are explained in the present application by applying specific examples, and the description of the above embodiments is only used to help understanding the technical scheme and the core concept of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims (10)

1. The headspace degassing method of the oil-immersed equipment is applied to a headspace degassing device of the oil-immersed equipment, the headspace degassing device of the oil-immersed equipment comprises an oil line unit, a degassing unit, an air line unit, a measuring unit and a control unit, the degassing unit comprises a degassing device, and the headspace degassing method of the oil-immersed equipment comprises the following steps:
the control unit sends a sampling enabling signal to the oil circuit unit so that the oil circuit unit obtains a cooling oil sample from oil-immersed equipment;
the control unit sends a degassing enabling signal to the oil path unit and the degassing unit to control the cooling oil sample to flow into the degassing unit from the oil path unit, and the degassing device is used for stirring the cooling oil sample in the degassing unit within a preset liquid level height so that the degassing unit degasses the cooling oil sample to obtain a gas sample to be tested;
the control unit sends measurement enabling signals to the degassing unit, the gas circuit unit and the measuring unit so as to control the gas sample to be measured to flow into the measuring unit from the degassing unit through the gas circuit unit and control a photoacoustic spectroscopy device in the measuring unit to respectively measure the concentration of the characteristic gas in the gas sample to be measured by using narrow-bandwidth laser corresponding to the characteristic gas;
and the control unit determines the operation fault of the oil-immersed equipment according to the concentration of the characteristic gas in the gas sample to be measured, which is obtained by the measuring unit.
2. The method for headspace degassing of an oil filled device according to claim 1, wherein the measuring unit comprises a first sensor located on the degassing means for measuring the level height of the cooling oil sample, and the degassing means is configured for agitating the cooling oil sample in the degassing unit within a preset level height, comprising:
the control unit controls the first sensor to obtain a first liquid level height of the cooling oil sample;
acquiring the stirring speed of a stirring member;
determining the viscosity of the cooling oil sample based on the first liquid level height and the stirring speed of the stirring member according to the correlation among the liquid level height, the viscosity and the stirring speed;
and determining the target stirring speed of the cooling oil sample based on the target liquid level height and the viscosity of the cooling oil sample according to the incidence relation among the liquid level height, the viscosity and the stirring speed.
3. The method for degassing the head space of an oil-filled device according to claim 2, wherein the measuring unit comprises a second sensor located on the degassing device, the second sensor is used for measuring the distance between the central axis of the stirring member and the cooling oil sample, and the step of determining the target stirring speed of the cooling oil sample based on the target liquid level height and the viscosity of the cooling oil sample according to the correlation relationship among the liquid level height, the viscosity and the stirring speed comprises the following steps:
judging whether the first liquid level height of the cooling oil sample is equal to the preset liquid level height or not;
if the first liquid level height of the cooling oil sample is equal to the preset liquid level height, the control unit controls the second sensor to acquire the vortex inner diameter between the central shaft of the stirring member and the cooling oil sample;
determining the pressure to which the degassing device is subjected based on the vortex inner diameter of the degassing device and the viscosity of the cooling oil sample according to the correlation among the viscosity, the vortex inner diameter and the pressure;
obtaining a second liquid level of the cooling oil sample according to the pressure to which the degassing device is subjected;
and determining a target stirring speed of the cooling oil sample based on the second liquid level height and the viscosity of the cooling oil sample according to the correlation among the liquid level height, the viscosity and the stirring speed.
4. The method according to claim 2, wherein the measuring unit comprises a third sensor located on the degassing device, the third sensor is configured to measure a pressure applied to the degassing device, and the step of determining the target stirring speed of the cooling oil sample based on a target liquid level and the viscosity of the cooling oil sample according to the correlation between the liquid level, the viscosity and the stirring speed comprises:
judging whether the first liquid level height of the cooling oil sample is equal to the preset liquid level height or not;
if the first liquid level height of the cooling oil sample is equal to the preset liquid level height, the control unit controls the third sensor to acquire the pressure applied by the degassing device by the cooling oil sample;
obtaining a second liquid level of the cooling oil sample according to the pressure to which the degassing device is subjected;
and determining a target stirring speed of the cooling oil sample based on the second liquid level height and the viscosity of the cooling oil sample according to the correlation among the liquid level height, the viscosity and the stirring speed.
5. The method for degassing the headspace of an oil-filled device according to claim 3 or 4, further comprising, after the step of determining the target stirring speed of the stirring member based on the pressure to which the degassing device is subjected and the viscosity of the cooling oil sample, according to a correlation of viscosity, pressure and stirring speed:
acquiring position information of a contact area in the degassing device, which is in contact with the cooling oil sample;
according to the position information of the contact area, the control unit controls a covering device positioned in the degassing device to cover the contact area so that the gas to be measured in the cooling oil sample enters the measuring unit from an area, which is not covered by the covering device, in the degassing device.
6. The method for degassing the headspace of an oil-filled device according to claim 3 or 4, further comprising, after the step of determining the target stirring speed of the stirring member based on the pressure to which the degassing device is subjected and the viscosity of the cooling oil sample, according to a correlation of viscosity, pressure and stirring speed:
obtaining a critical pressure of the degassing device;
determining whether the pressure to which the degassing device is subjected is greater than the critical pressure;
when the degassing device is subjected to a pressure greater than the critical pressure, the control module controls the degassing device to move away from the cooling oil sample.
7. The headspace degassing device of the oil-immersed equipment is characterized by comprising an oil path unit, a degassing unit, an air path unit, a measuring unit and a control unit, wherein the degassing unit comprises a degassing device,
the control unit is used for sending a sampling enabling signal to the oil path unit at the first moment so that the oil path unit can obtain a cooling oil sample from the oil-immersed equipment;
the control unit is further used for sending a degassing enabling signal to the oil path unit and the degassing unit at a second moment so as to control the cooling oil sample to flow into the degassing unit from the oil path unit, and the degassing device is used for stirring the cooling oil sample in the degassing unit within a preset liquid level height so that the degassing unit is used for degassing the cooling oil sample to obtain a gas sample to be tested;
the control unit is further configured to send a measurement enabling signal to the degassing unit, the gas path unit and the measurement unit at a third moment, so as to control the gas sample to be measured to flow from the degassing unit to the measurement unit through the gas path unit, and control the photoacoustic spectroscopy device in the measurement unit to measure the concentration of the characteristic gas in the gas sample to be measured by using the narrow-bandwidth laser corresponding to the characteristic gas;
and the control unit is also used for determining the operation fault of the oil-immersed equipment at a fourth moment according to the concentration of the characteristic gas in the gas sample to be measured, which is obtained by the measuring unit.
8. The headspace degassing device of an oil-filled device according to claim 7, wherein the degassing unit comprises at least a first degassing means located close to the cooling oil sample and a second degassing means located remote from the cooling oil sample;
the first degassing device comprises a first degassing film and a first covering device positioned on one side of the first degassing film, the first covering device is arranged close to one side of the cooling oil sample, the first covering device is used for isolating the cooling oil sample and the gas to be tested in the cooling oil sample from the first degassing device in the first degassing, and the first covering device comprises a first opening corresponding to the central area of the first degassing film;
the second degassing device comprises a second degassing film and a second covering device positioned on one side of the second degassing film, the second covering device is arranged close to one side of the cooling oil sample, the second covering device is used for isolating the cooling oil sample and gas to be tested in the cooling oil sample from the second degassing device in the second degassing, the second covering device corresponds to the first opening, and the second covering device comprises a second opening positioned at the outer ring of the second covering device;
the first opening is used for enabling gas to be detected in the cooling oil sample to penetrate through the first degassing film, the second opening is used for enabling the gas to be detected to penetrate through the second degassing film, and the first covering device and the second covering device are overlapped.
9. The headspace degassing device of an oil-filled device according to claim 8, wherein the first covering means is embedded in the degassing unit, and the first covering means is telescopically connected to the degassing unit.
10. The headspace degassing device of an oil-filled device according to claim 8, wherein the degassing unit further comprises at least a first gas flow homogenizing plate, a second gas flow homogenizing plate, and a third gas flow homogenizing plate located on the second degassing device;
the first airflow homogenizing plate is provided with a plurality of first through holes, the second airflow homogenizing plate is provided with a plurality of second through holes, the third airflow homogenizing plate is provided with a plurality of third through holes, the aperture of the first through hole is larger than that of the second through hole, and the aperture of the second through hole is larger than that of the third through hole.
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