CN112213268B

CN112213268B - Stirring speed control method and device based on oil inlet pressure

Info

Publication number: CN112213268B
Application number: CN202011055467.8A
Authority: CN
Inventors: 代犇; 杨军; 程国兵; 费明和; 黄杰; 张硕
Original assignee: Hubei Infotech Co ltd
Current assignee: Hubei Infotech Co ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-11-09
Anticipated expiration: 2040-09-29
Also published as: CN112213268A

Abstract

The embodiment of the application provides a stirring speed control method and a device based on oil inlet pressure, the stirring speed control method based on the oil inlet pressure obtains a cooling oil sample from an 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, and determines the operation fault of the oil-immersed device according to the concentration of the characteristic gas, so that the stirring speed control device based on the oil inlet pressure can obtain sampling data in real time, the operation fault of the oil-immersed device can be predicted according to the concentration of the characteristic gas to give an alarm, and the damage of the oil-immersed device is avoided; meanwhile, a first stirring speed is determined according to the viscosity of the cooling oil sample and the initial pressure in the degassing unit, so that the gas sample to be detected is separated from the degassing unit within the target degassing time, and the detection speed is improved.

Description

Stirring speed control method and device based on oil inlet pressure

Technical Field

The application relates to the field of transformer oil gas monitoring, in particular to a stirring speed control method and device based on oil inlet pressure.

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, so that a large number of large-scale oil-immersed electric power equipment (such as transformers) are adopted in the electric power systems, and in order to guarantee the safe operation of the electric power systems, the degassing state of the large-scale oil-immersed electric power equipment such as the transformers needs 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 traditional stirring speed control scheme based on oil inlet pressure, after an oil sample in oil-immersed power equipment needs to be manually extracted and concentrated in a laboratory, a gas chromatograph is used for determining the degassing state of the oil-immersed equipment, and the efficiency is low.

Disclosure of Invention

The embodiment of the application provides a stirring speed control method and device based on oil inlet pressure, and the method and device are used for solving the technical problem that the existing stirring speed control equipment based on the oil inlet pressure cannot acquire oil sample data in real time due to the fact that manual monitoring and oil sample data processing are needed.

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 stirring speed control method based on oil inlet pressure, stirring speed control method based on oil inlet pressure is applied to stirring speed control device based on oil inlet pressure, stirring speed control device based on oil inlet pressure includes oil circuit unit, degasification unit, gas circuit unit, measuring element and the control unit, stirring speed control method based on oil inlet pressure includes:

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, a first stirring speed is obtained and determined according to the viscosity of the cooling oil sample and the initial pressure in the degassing unit, and the stirring of a stirring member in the degassing unit is controlled based on the first stirring speed, so that the degassing unit carries out degassing on 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 stirring speed control device based on oil inlet pressure, and the control device comprises an oil circuit unit, a degassing unit, an air circuit unit, a measuring unit and a control unit;

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 further sends 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, a first stirring speed is obtained and determined according to the viscosity of the cooling oil sample and the initial pressure in the degassing unit, and the stirring of a stirring member in the degassing unit is controlled based on the first stirring speed so that the degassing unit carries out degassing on 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 stirring speed control method and a device based on oil inlet pressure, the stirring speed control method based on the oil inlet pressure is applied to a stirring speed control device based on the oil inlet pressure, the stirring speed control device based on the oil inlet pressure comprises an oil path unit, a degassing unit, an air path unit, a measuring unit and a control unit, the stirring speed control method based on the oil inlet pressure comprises the steps that the control unit firstly sends a sampling enabling signal to the oil path unit, so that the oil path unit obtains a cooling oil sample from 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, a first stirring speed is obtained and determined according to the viscosity of the cooling oil sample and the initial pressure in the degassing unit, and the stirring of a stirring member in the degassing unit is controlled based on the first stirring speed, so that the degassing unit carries out degassing on 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 degassing treatment is carried out on the cooling oil sample 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 stirring speed control device based on the oil inlet pressure can obtain the sampling data in real time, the operation fault of the oil-immersed equipment can be predicted according to the concentration of the characteristic gas to give an alarm, and the damage of the oil-immersed equipment is avoided; meanwhile, a first stirring speed is determined according to the viscosity of the cooling oil sample and the initial pressure in the degassing unit, and stirring of a stirring member in the degassing unit is controlled based on the first stirring speed, so that the degassing unit is used for degassing the cooling oil sample to obtain a gas sample to be detected, the gas sample to be detected is separated from the degassing unit within target degassing time, the detection period is shortened, the detection efficiency is improved, and the technical problem that the stirring speed of the stirring member in the oil-gas separation equipment cannot be accurately set by the conventional stirring speed control equipment based on oil inlet pressure 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 chart of a method for controlling a stirring speed based on an oil inlet pressure according to an embodiment of the present application.

Fig. 3 is a structural diagram of the stirring speed control device based on the oil feed pressure according to the present application.

Fig. 4 is a schematic structural diagram of a symmetrical gas measurement device of a stirring speed control device based on oil inlet pressure provided in an embodiment of the present application.

Fig. 5 is a schematic block diagram of a signal processing unit of the oil-feed-pressure-based stirring speed control device according to the embodiment of the present application.

Fig. 6 is a schematic circuit diagram of a photoelectric conversion circuit in a signal processing unit of the oil-intake-pressure-based stirring speed control device provided in the embodiment of the present application.

Fig. 7 is a schematic circuit diagram of a first signal amplification circuit in a signal processing unit of an oil-intake-pressure-based stirring speed control device provided in 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 the oil-intake-pressure-based stirring speed control device provided in the embodiment of the present application.

Fig. 9 is a schematic circuit diagram of a second signal amplifying circuit in a signal processing unit of the oil-intake-pressure-based stirring speed control device according to the embodiment of the present application.

Fig. 10 is a schematic circuit diagram of an a/D conversion circuit in a signal processing unit of the oil-intake-pressure-based stirring speed control device according to the 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 diagram of the stirring speed control device based on oil inlet pressure 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 scene schematic diagram of a monitoring system of an oil-immersed device according to an embodiment of the present application, where the monitoring system of the oil-immersed device 200 may include an oil-immersed device 200 and a stirring speed control device 100 based on oil inlet pressure, and the stirring speed control device 100 based on oil inlet pressure 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 one embodiment, the oil-feed-pressure-based stirring speed control apparatus 100 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. The oil inlet pressure-based stirring speed control device 100 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, determines a first stirring speed according to the viscosity of the cooling oil sample and the initial pressure inside the degassing unit 120, and controls the stirring of a stirring member inside the degassing unit 120 based on the first stirring speed to degas the cooling oil sample by the degassing unit 120 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 method for controlling a degassing state of an oil-filled device 200 according to an embodiment of the present application, and fig. 3 is a schematic structural diagram of a stirring speed control device 100 based on an oil-intake pressure according to the present application, please refer to fig. 2 and fig. 3, where the method for controlling the degassing state of the oil-filled device 200 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, determines a first stirring speed according to the viscosity of the cooling oil sample and the initial pressure in the degassing unit, and controls the stirring of the stirring member 213 in the degassing unit 120 based on the first stirring speed to degas the cooling oil sample by the degassing unit 120 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 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 operating 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 of the stirring speed control device 100 based on the oil inlet pressure, 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 speed of the gas to be measured. For sample oils with different viscosities or temperatures and at different stirring speeds, the degassing rates of the oil-gas separation device in the degassing state monitoring device for the gas to be detected in the sample oil to be separated from the oil-immersed device 200 are different. The degassing state monitoring device of the conventional 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 measured in the sample oil cannot be separated from the oil-gas separation device within a target time. The present embodiment determines the first stirring speed of the stirring member 213 mainly by acquiring the viscosity of the cooling oil sample and the initial pressure in the degassing unit 120 in the second stage of the oil-feed-pressure-based stirring speed control apparatus 100.

In one embodiment, the initial pressure in the degassing unit 120 can be directly obtained from the pressure sensor of fig. 3, while the viscosity of the cooling oil sample cannot be directly obtained from the corresponding sensor. The initial stirring speed of the stirring member 213 can be determined by measuring the acting force of the cooling oil sample on the pipeline, the valve or the component in the degassing unit 120 or the physical property of the cooling oil itself in the oil feeding stage, obtaining the viscosity of the cooling oil sample according to the relationship between the physical property of the cooling oil and the viscosity of the cooling oil and the internal pressure of the degassing unit 120, and then according to the correlation among the viscosity, the oil feeding time, the stirring speed and the like.

Specifically, the cooling oil sample may enter the degassing unit 120 according to a pressure difference between the transformer oil tank and the degassing unit 120, and since the initial pressure inside the degassing unit 120 is a determined value, the present embodiment may determine the viscosity of the cooling oil according to the oil feeding rate of the cooling oil sample, and further determine the first stirring speed of the stirring member 213, where the step may include: obtaining an initial pressure within the degassing unit 120; acquiring the oil feeding rate of the cooling oil sample flowing from the oil path unit 110 into the degassing unit 120; determining the viscosity of the cooling oil sample based on the initial pressure and the oil feeding rate according to the incidence relation among the oil feeding rate, the viscosity and the pressure; determining a first stirring speed of the stirring member 213 based on the viscosity of the cooling oil sample and a target oil-in time according to the correlation of the viscosity, the oil-in time, and the stirring speed.

Specifically, under the same pressure, cooling oil samples with different viscosities have different oil feeding rates, and the viscosities are inversely related to the oil feeding rates, that is, the greater the viscosity of the cooling oil sample is, the smaller the oil feeding rate of the cooling oil sample is, and the smaller the viscosity of the cooling oil sample is, the greater the oil feeding rate of the cooling oil sample is. Since the initial pressure in the oil tank 210 of the degassing unit 120 is a determined value, and the pressure value of the transformer tank is the standard atmospheric pressure, the pressure difference between the degassing unit 120 and the transformer tank is the difference between the standard atmospheric pressure and the initial pressure, and the diameter of the oil inlet pipeline between the degassing unit 120 and the transformer tank is a determined value, that is, the oil inlet rate of the cooling oil sample can be determined according to the pressure difference between the degassing unit 120 and the transformer tank and the diameter of the oil inlet pipeline. Secondly, regarding the specific correlation among the oil feeding rate, the viscosity and the pressure, the corresponding functional relation can be obtained through historical data or other empirical formulas, that is, the determined viscosity of the cooling oil sample is obtained according to the oil feeding rate of the cooling oil sample and the pressure difference between the degassing unit 120 and the transformer oil tank.

Specifically, the stirring speed in the cooling oil sample is related to the oil feeding time of the cooling oil sample in addition to the viscosity of the cooling oil sample. The stirring speed of the cooling oil sample is positively correlated with the oil inlet time of the cooling oil sample, and the longer the oil inlet time of the cooling oil sample is, the higher the viscosity of the corresponding cooling oil sample is, the higher the corresponding stirring speed is; the shorter the oil inlet time of the cooling oil sample is, the smaller the viscosity of the corresponding cooling oil sample is, and the smaller the corresponding stirring speed is. For the cooling oil sample in the oil-filled device 200 that needs to be introduced into the degassing unit 120 within the target oil-in time, the corresponding viscosity of the cooling oil may be set according to the determined target oil-in time, and the corresponding stirring speed of the stirring member 213 may be determined according to the determined viscosity of the cooling oil. Regarding the correlation among viscosity, oil inlet time and stirring speed, the corresponding functional relation can be obtained through historical data or other empirical formulas.

In the embodiment, the pressure difference between the transformer oil tank and the degassing unit 120 is obtained to obtain the oil inlet rate of the cooling oil sample flowing into the degassing unit 120 from the oil path unit 110, then the viscosity of the cooling oil sample is determined according to the correlation between the oil inlet rate and the viscosity and the pressure, and then the first stirring speed of the stirring member 213 is determined according to the correlation between the viscosity and the oil inlet time and the stirring speed, so that the accuracy of determining the stirring speed of the stirring member 213 is improved, the gas to be measured can be separated from the cooling oil sample within the target degassing time, and the degassing efficiency of the gas to be measured is improved.

In an embodiment, a sample of the cooling oil may enter the degassing unit 120 according to a pressure difference between the transformer tank and the degassing unit 120, and since an initial pressure in the degassing unit 120 is a determined value, the embodiment may determine a viscosity of the cooling oil according to an oil inlet pressure of the sample of the cooling oil, and further determine a first stirring speed of the stirring member 213, which may include: obtaining an initial pressure within the degassing unit 120; acquiring the oil inlet pressure of the cooling oil sample flowing from the oil path unit 110 into the degassing unit 120; determining the viscosity of the cooling oil sample based on the initial pressure and the oil inlet pressure according to the incidence relation among the oil inlet pressure, the viscosity and the pressure; determining a first stirring speed of the stirring member 213 based on the viscosity of the cooling oil sample and a target oil-in time according to the correlation of the viscosity, the oil-in time, and the stirring speed.

Specifically, under the same pressure, the cooling oil samples with different viscosities have different oil inlet pressures, and the viscosities are inversely related to the oil inlet pressures, that is, the greater the viscosity of the cooling oil sample is, the smaller the oil inlet pressure of the cooling oil sample is, and the smaller the viscosity of the cooling oil sample is, the greater the oil inlet pressure of the cooling oil sample is. Since the initial pressure in the oil tank 210 of the degassing unit 120 is a determined value, and the pressure value of the transformer oil tank is the standard atmospheric pressure, the pressure difference between the degassing unit 120 and the transformer oil tank is the difference between the standard atmospheric pressure and the initial pressure, and the diameter of the oil inlet pipeline between the degassing unit 120 and the transformer oil tank is a determined value, which is equivalent to the ratio of the pressure to the area being the pressure born by the unit area, that is, the oil inlet pressure of the cooling oil sample can be determined according to the pressure difference between the degassing unit 120 and the transformer oil tank and the diameter of the oil inlet pipeline. Secondly, regarding the specific correlation among the oil inlet pressure, the viscosity and the pressure, the corresponding functional relation can be obtained through historical data or other empirical formulas, that is, the determined viscosity of the cooling oil sample is obtained according to the oil inlet rate of the cooling oil sample and the pressure difference between the degassing unit 120 and the transformer oil tank.

In the embodiment, the pressure difference between the transformer oil tank and the degassing unit 120 is obtained to obtain the oil inlet pressure of the cooling oil sample flowing into the degassing unit 120 from the oil path unit 110, then the viscosity of the cooling oil sample is determined according to the correlation between the oil inlet rate and the viscosity and the pressure, and then the first stirring speed of the stirring member 213 is determined according to the correlation between the viscosity and the oil inlet time and the stirring speed, so that the accuracy of determining the stirring speed of the stirring member 213 is improved, the gas to be measured can be separated from the cooling oil sample within the target degassing time, and the degassing efficiency of the gas to be measured is improved.

In one embodiment, since the viscosity of the cooling oil sample is also related to the temperature of the cooling oil sample, that is, the higher the temperature of the cooling oil sample is, the lower the viscosity of the cooling oil sample is, the lower the resistance of the stirring member 213 during the later rotation is, and the kinetic energy of the gas to be measured in the cooling oil sample is larger, the degassing time of the gas to be measured is relatively reduced. Therefore, when taking an example of obtaining the viscosity of the cooling oil sample by the oil inlet pressure, the step may include: obtaining an initial pressure within the degassing unit 120; acquiring the oil inlet pressure of the cooling oil sample flowing from the oil path unit 110 into the degassing unit 120; acquiring the oil inlet temperature of the cooling oil sample flowing from the oil path unit 110 into the degassing unit 120; determining the viscosity of the cooling oil sample based on the initial pressure, the oil inlet temperature and the oil inlet pressure according to the incidence relation among the oil inlet pressure, the temperature, the viscosity and the pressure; determining a first stirring speed of the stirring member 213 based on the viscosity of the cooling oil sample and a target oil-in time according to the correlation of the viscosity, the oil-in time, and the stirring speed.

Specifically, when the stirring speed of the stirring member 213 is set, the temperature of the cooling oil sample may be obtained in advance, and the viscosity of the cooling oil sample may be determined by obtaining a functional relation between the temperature and the viscosity of the cooling oil sample according to an inverse correlation relationship between the temperature of the cooling oil sample and the viscosity of the cooling oil sample, or according to historical data or other empirical formulas. The higher the temperature is, the smaller the viscosity is, the greater the initial pressure is, the higher the oil inlet pressure is, the oil inlet pressure is large, the oil inlet speed is faster corresponding to the cooling oil sample with the smaller viscosity, that is, the oil inlet time of the cooling oil sample is shorter, so that the cooling oil sample can enter the degassing unit 120 within the target oil inlet time. Next, a first stirring speed of the stirring member 213 is determined according to the correlation of the viscosity, the oil-feeding time, and the stirring speed, and based on the viscosity of the cooling oil sample and the target oil-feeding time.

Specifically, when taking an example of obtaining the viscosity of the cooling oil sample at the oil feeding rate, the step may include: obtaining an initial pressure within the degassing unit 120; acquiring the oil feeding rate of the cooling oil sample flowing from the oil path unit 110 into the degassing unit 120; acquiring the oil inlet temperature of the cooling oil sample flowing from the oil path unit 110 into the degassing unit 120; determining the viscosity of the cooling oil sample based on the initial pressure, the oil inlet temperature and the oil inlet rate according to the incidence relation among the oil inlet rate, the temperature, the viscosity and the pressure; determining a first stirring speed of the stirring member 213 based on the viscosity of the cooling oil sample and a target oil-in time according to the correlation of the viscosity, the oil-in time, and the stirring speed.

The present embodiment considers the influence of temperature on the oil feeding rate, the higher the temperature is, the smaller the viscosity of the cooling oil sample is, the shorter the oil feeding time of the cooling oil sample is under the condition that the initial pressure in the oil tank 210 of the degassing unit 120 is the same, and then the stirring speed suitable for the cooling oil sample is determined according to the cooling oil viscosity and the temperature obtained from the target oil feeding time, 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, the accuracy of the setting of the stirring speed is further improved, and the setting of the stirring speed can be reduced by adjusting the temperature of the cooling oil sample within the limited target degassing time.

In one embodiment, the temperature of the cooling oil sample has a direct relationship with the viscosity of the cooling oil sample, increasing the temperature of the cooling oil can reduce the viscosity of the cooling oil, and the shorter the oil inlet time of the cooling oil is, the shorter the degassing time of the gas to be measured in the cooling oil sample is. However, the temperature of the cooling oil sample has an upper limit, for example, the working temperature of the cooling oil sample cannot exceed 80 ℃, and when the working temperature exceeds the speed, the teflon film in the degassing unit 120 is accelerated to age, so that the air permeability is reduced, and therefore, the increase of the cooling oil temperature has a critical value, for example, 75 ℃ is a critical temperature, and 80 ℃ has a safety range of 5 ℃, and the specific critical temperature can be set according to actual conditions.

Specifically, critical temperature's settlement can guarantee to normally work based on relevant parts in oil feed pressure's stirring speed controlling means 100, avoids appearing the high temperature and the effect of degasification is poor or can't carry out degasification's technical problem. Taking the above embodiment of obtaining the viscosity of the cooling oil sample by the feeding oil pressure as an example, the step may include: obtaining an initial pressure within the degassing unit 120; acquiring the oil inlet pressure of the cooling oil sample flowing from the oil path unit 110 into the degassing unit 120; acquiring the oil inlet temperature of the cooling oil sample flowing from the oil path unit 110 into the degassing unit 120; determining the viscosity of the cooling oil sample based on the initial pressure, the oil inlet temperature and the oil inlet pressure according to the incidence relation among the oil inlet pressure, the temperature, the viscosity and the pressure; determining a first stirring speed of the stirring member 213 based on the viscosity of the cooling oil sample and a target oil-feeding time according to the correlation of the viscosity, the oil-feeding time and the stirring speed; obtaining a critical temperature of the cooling oil sample; judging whether the oil inlet temperature of the cooling oil sample is greater than the critical temperature or not; if the cooling oil sample is larger than the critical temperature, the critical temperature is the oil inlet temperature of the cooling oil sample, and the first stirring speed of the stirring member 213 is determined based on the viscosity of the cooling oil sample, the critical temperature and the target oil inlet time according to the incidence relation of the temperature, the viscosity, the oil inlet time and the stirring speed.

Specifically, after the first stirring speed of the stirring member 213 is obtained, the oil inlet temperature is set by comparing the ratio of the oil inlet temperature to the critical temperature, for example, when the oil inlet temperature is higher than the critical temperature, the cooling oil may be cooled, and other influences are needed to compensate for the reduction in viscosity of the cooling oil due to the cooling, for example, when the temperature of the cooling oil sample is reduced, the oil inlet rate or the oil inlet pressure of the cooling oil will be reduced, the pressure difference between the degassing unit 120 and the transformer tank may be increased, and then, the degassing rate or the degassing time side length of the gas to be detected in the cooling oil sample due to the reduction in temperature of the cooling oil sample may be compensated for by increasing the stirring speed of the stirring member 213 or increasing the air suction force of the air cylinder 221 in the air suction device. In the embodiment, the appropriate first stirring speed is determined according to the correlation among the temperature, the viscosity, the oil feeding time and the stirring speed, and the viscosity of the cooling oil sample, the critical temperature and the target oil feeding time are known.

This embodiment is through the critical temperature who acquires the cooling oil sample to and according to the critical temperature contrast of oil feed temperature and cooling oil sample, acquire the actual temperature of cooling oil sample avoids appearing the high temperature and the poor or unable degasification technical problem of degasification effect appears, and when oil feed temperature is greater than critical temperature, the reduction of cooling oil sample oil feed temperature, compensates through the increase of stirring speed and degasification unit 120 and transformer tank pressure differential, under the condition of guaranteeing degasification unit 120 functional integrity, makes the gas that awaits measuring in the cooling oil sample break away from degasification unit 120 in the target degasification time.

In one embodiment, the stirring speed of the stirring member 213 of the current measurement period may be determined according to the correlation between the historical initial pressure, the historical viscosity and the historical stirring speed measured in the historical measurement period, and according to the known initial pressure and the viscosity of the cooling oil in the degassing unit 120 of the current measurement period, and the step may include: obtaining a historical initial pressure in the degassing unit 120, a historical viscosity of the cooling oil sample, and a historical stirring speed of the stirring member 213 during a predetermined historical measurement period; acquiring an initial pressure in the degassing unit 120 and an oil inlet pressure of the cooling oil sample flowing into the degassing unit 120 from the oil path unit 110 in a current measurement period; obtaining the viscosity of the cooling oil sample according to the initial pressure intensity and the oil inlet pressure; obtaining a historical initial pressure, a historical viscosity and a historical stirring speed correlation relationship, and determining a first stirring speed of the stirring member 213 in the current measurement period based on the initial pressure and the viscosity of the cooling oil sample in the current measurement period.

In one embodiment, the measurement cycle refers to a time required by the oil-intake pressure-based stirring speed control apparatus 100 to introduce the cooling oil sample in the oil-filled device 200 into the degassing unit 120 in the second stage and to introduce all the gas in the oil tank 210 into the measurement unit 140 in the third stage, or to increase the pressure of the oil tank 210 from an initial pressure (i.e., a first target pressure in the oil tank 210) to a pressure reached when the cooling oil sample reaches the position of the upper level sensor, and to decrease the internal pressure of the oil tank 210 to the second target pressure. In order to ensure the accuracy of the data, the cooling oil sample in the oil-filled device 200 needs to be randomly acquired and measured for multiple times, so that the whole measurement process needs to be completed in multiple measurement cycles. That is, the stirring speed of the stirring member 213 can be determined according to the relationship between the historical initial pressure, the historical viscosity and the historical stirring speed in the previous or historical measurement cycles.

Specifically, the stirring speed of the current measurement period may be obtained by an average value of the historical initial pressure, the historical viscosity, and the historical stirring speed in the historical measurement period. For example, the current measurement period is the fifth measurement period, the initial pressure of the first measurement period is a1, the initial pressure of the second measurement period is a2, the initial pressure of the third measurement period is a3, the initial pressure of the fourth measurement period is a4, the average initial pressure of the first four measurement periods is (a1+ a2+ a3+ a4)/4, and the average historical viscosity and the historical stirring speed of the cooling oil sample can also be the average values of the first four periods. Then, determining the viscosity of the current measurement period according to the initial pressure in the degassing unit 120 and the oil inlet pressure of the cooling oil sample in the current measurement period; next, the first stirring speed of the stirring member 213 in the current measurement period is determined according to the viscosity of the cooling oil sample in the current measurement period, the initial pressure of the degassing unit 120, and the correlation between the average values of the three obtained in the historical measurement periods. In addition, for the calculation of the average value, the minimum value and the maximum value in the plurality of measurement periods may be removed, and the average value in the remaining measurement periods may be obtained as the predicted value of the current period.

Specifically, the stirring speed of the stirring member 213 in the current measurement period may be obtained by a relationship curve between the historical initial pressure, the historical viscosity, and the historical stirring speed in the historical measurement period. For example, obtaining a relation curve of historical initial pressure, historical viscosity and historical stirring speed in ten continuous measurement periods of a certain historical time period, placing the historical initial pressure, the historical viscosity and the historical stirring speed in an XYZ coordinate system, marking data of a plurality of measurement periods in the XYZ coordinate system, and fitting the data of the plurality of measurement periods into the relation curve, wherein the initial pressure is an X axis, the viscosity is a Y axis, and the stirring speed is a Z axis; secondly, determining the viscosity of the current measurement period according to the initial pressure in the degassing unit 120 and the oil inlet pressure of the cooling oil sample in the current measurement period, and performing matching corresponding stirring speed on the curve according to the viscosity of the cooling oil sample in the current measurement period and the initial pressure of the degassing unit 120.

According to the embodiment, the stirring speed of the stirring member 213 in the current measurement period is determined according to the correlation among the historical initial pressure, the historical viscosity and the historical stirring speed measured in the historical measurement period, and according to the known initial pressure and the known viscosity of the cooling oil in the degassing unit 120 in the current measurement period, so that the accuracy of obtaining the stirring speed of the stirring member 213 is improved, the gas to be detected in the cooling oil sample can be separated from the cooling oil sample within the target degassing time, and the degassing efficiency of the gas to be detected is improved.

In one embodiment, when the stirring speed is set according to the above steps, the stirring speed needs to be adjusted, and the stirring speed of the stirring member 213 has an upper limit of increasing, i.e. a critical stirring speed, for example, when the viscosity of the cooling oil sample is too high, a higher stirring speed is needed, i.e. the stirring speed of the stirring member 213 may need to exceed the critical stirring speed, but the stirring member 213 exceeding the critical stirring speed cannot reach, which needs to be adjusted according to other adjustment factors to compensate the limitation of the stirring speed. This step may thus comprise: obtaining a critical stirring speed of the stirring member 213; determining whether the first stirring speed is greater than a critical stirring speed of the stirring member 213; if the first stirring speed is greater than the critical stirring speed of the stirring member 213, setting the critical stirring speed as the target stirring speed of the stirring member 213; if the first stirring speed is less than the critical stirring speed of the stirring member 213, the first stirring speed is set as the target stirring speed of the stirring member 213.

Specifically, when the viscosity of the cooling oil sample is too high, the stirring member 213 needs too high stirring force during stirring, and the gas to be measured in the cooling oil sample needs a higher stirring speed to be separated from the degassing unit 120 within the target degassing time. Since the stirring member 213 is controlled by the second driving motor 215, for example, the present application provides a magnetic stirring rod in the oil tank 210, and provides a rotating magnet 214 controlled by the second driving motor 215 outside the oil tank 210, which drives the magnet outside to rotate so as to rotate the magnetic stirring rod in the oil tank 210. The output power of the second driving motor 215 has an upper limit, so that the rotating magnet 214 and the magnetic stirring bar have a critical stirring speed, and when the first stirring speed exceeds the critical stirring speed, the degassing rate of the gas to be measured cannot be increased by increasing the stirring speed.

In one embodiment, since the viscosity of the cooling oil sample has a direct correlation with the temperature, after the step of setting the critical stirring speed as the target stirring speed of the stirring member 213, it may include: acquiring the oil inlet temperature of the cooling oil sample flowing from the oil path unit 110 into the degassing unit 120; determining the target viscosity of the cooling oil sample based on the first stirring speed and the oil inlet temperature of the cooling oil sample according to the correlation among the temperature, the viscosity and the stirring speed; and determining the stirring temperature of the cooling oil sample based on the target viscosity and the critical stirring speed according to the correlation among the temperature, the viscosity and the stirring speed.

Specifically, the viscosity of the cooling oil sample is controlled through the determined critical stirring speed and the adjustment of the temperature, so that the cooling oil sample can separate the gas to be measured in the cooling oil sample from the degassing unit 120 within a preset rotating speed. In addition, the stirring speed can be set to be lower than the critical stirring speed, so that the stirring member 213 is prevented from being damaged due to the fact that the stirring member 213 is in the critical stirring speed for a long time.

Specifically, although the above-described embodiment can cause the stirring member 213 to complete the desorption process of the gas to be measured at a low stirring speed by adjusting the temperature, the temperature also has a critical temperature, and therefore, the stirring temperature also needs to be limited when the temperature is adjusted, and if the stirring temperature exceeds the critical temperature, the volume of the cooling oil sample may need to be reduced, or the like.

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

This embodiment is through the injecture of influence factors such as regulation temperature in order to compensate stirring speed for the gas that awaits measuring in the cooling oil sample can break away from degasification unit 120 in the target degasification time, has shortened detection cycle, has improved detection efficiency, has solved the technical problem that stirring component 213's stirring speed in the current oily formula equipment 200 degasification state monitoring equipment can't accurately set up oil gas separation equipment usually.

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.

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 stirring speed control apparatus based on an oil inlet pressure 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 the oil-intake-pressure-based stirring speed control apparatus according to the embodiment of the present application; 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 degassing state control method for an oil-immersed device 200, the degassing state control method for 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 characteristic gas in the gas sample to be detected, and determines the operation fault of the oil-immersed device 200 according to the concentration of the characteristic gas, so that the stirring speed control device 100 based on oil inlet pressure can obtain sampling data in real time, the operation fault of the oil-immersed device 200 can be predicted according to the concentration of the characteristic gas to give an alarm, and the damage of the oil-immersed device 200 is avoided; meanwhile, a first stirring speed is determined according to the viscosity of the cooling oil sample and the initial pressure in the degassing unit, and stirring of a stirring member in the degassing unit is controlled based on the first stirring speed, so that the degassing unit is used for degassing the cooling oil sample to obtain a gas sample to be detected, the gas sample to be detected is separated from the degassing unit within target degassing time, the detection period is shortened, the detection efficiency is improved, and the technical problem that the stirring speed of the stirring member in the oil-gas separation equipment cannot be accurately set by the conventional stirring speed control equipment based on oil inlet pressure is solved.

Referring to fig. 16, fig. 16 is a structural diagram of a stirring speed control device 400 based on oil inlet pressure according to the present application, where the control 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;

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 the oil-immersed device 200;

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, obtain and determine a first stirring speed according to the viscosity of the cooling oil sample and the initial pressure inside the degassing unit 420, and control stirring of the stirring member 213 inside the degassing unit 420 based on the first stirring speed to degas the cooling oil sample by the degassing unit 420 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 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 440, at the fourth time.

In one embodiment, the degassing unit 420 includes an initial pressure obtaining sub-unit, an oil feed rate obtaining sub-unit, a viscosity obtaining sub-unit, and a stirring speed obtaining sub-unit. The initial pressure obtaining sub-unit is used for obtaining the initial pressure in the degassing unit 420; the oil-feeding rate acquiring sub-unit is used for acquiring the oil-feeding rate of the cooling oil sample flowing from the oil-way unit 410 to the degassing unit 420; the viscosity obtaining subunit is configured to determine, according to an incidence relation among an oil feeding rate, viscosity, and pressure, a viscosity of the cooling oil sample based on the initial pressure and the oil feeding rate; the stirring speed obtaining subunit is configured to determine, according to the correlation between the viscosity, the oil-taking time, and the stirring speed, a first stirring speed of the stirring member 213 based on the viscosity of the cooling oil sample and the target oil-taking time.

In one embodiment, the degassing unit 420 is used to obtain an initial pressure within the degassing unit 420; acquiring the oil inlet pressure of the cooling oil sample flowing from the oil way unit 410 to the degassing unit 420; determining the correlation of the viscosity of the cooling oil sample according to the viscosity, the oil feeding time and the stirring speed according to the correlation of the oil feeding pressure, the viscosity and the pressure, and determining the first stirring speed of the stirring member 213 according to the correlation of the viscosity of the cooling oil sample and the target oil feeding time based on the initial pressure and the oil feeding pressure.

In one embodiment, the degassing unit 420 is used for obtaining the oil inlet temperature of the cooling oil sample flowing from the oil path unit 410 to the degassing unit 420; and determining the viscosity of the cooling oil sample based on the initial pressure, the oil inlet temperature and the oil inlet pressure according to the incidence relation among the oil inlet pressure, the temperature, the viscosity and the pressure.

In one embodiment, the degassing unit 420 is further configured to obtain a critical temperature of the cooling oil sample; judging whether the oil inlet temperature of the cooling oil sample is greater than the critical temperature or not; if the cooling oil sample is larger than the critical temperature, the critical temperature is the oil inlet temperature of the cooling oil sample, and the first stirring speed of the stirring member 213 is determined based on the viscosity of the cooling oil sample, the critical temperature and the target oil inlet time according to the incidence relation of the temperature, the viscosity, the oil inlet time and the stirring speed.

In one embodiment, the degassing unit 420 is further configured to obtain a historical initial pressure in the degassing unit 420, a historical viscosity of the cooling oil sample, and a historical stirring speed of the stirring member 213 during a predetermined historical measurement period; acquiring an initial pressure in the degassing unit 420 and an oil inlet pressure of the cooling oil sample flowing into the degassing unit 420 from the oil path unit 410 in a current measurement period; obtaining the viscosity of the cooling oil sample according to the initial pressure intensity and the oil inlet pressure; obtaining a historical initial pressure, a historical viscosity and a historical stirring speed correlation relationship, and determining a first stirring speed of the stirring member 213 in the current measurement period based on the initial pressure and the viscosity of the cooling oil sample in the current measurement period.

In one embodiment, the degassing unit 420 is further configured to obtain a critical stirring speed of the stirring member 213; determining whether the first stirring speed is greater than a critical stirring speed of the stirring member 213; if the first stirring speed is greater than the critical stirring speed of the stirring member 213, setting the critical stirring speed as the target stirring speed of the stirring member 213; if the first stirring speed is less than the critical stirring speed of the stirring member 213, the first stirring speed is set as the target stirring speed of the stirring member 213.

In one embodiment, the degassing unit 420 is further configured to obtain an oil inlet temperature of the cooling oil sample flowing from the oil path unit 410 into the degassing unit 420; determining the target viscosity of the cooling oil sample based on the first stirring speed and the oil inlet temperature of the cooling oil sample according to the correlation among the temperature, the viscosity and the stirring speed; and determining the stirring temperature of the cooling oil sample based on the target viscosity and the critical stirring speed according to the correlation among the temperature, the viscosity and the stirring speed.

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 method and the device for controlling the stirring speed based on the oil inlet pressure provided by the embodiment of the application are described in detail, a specific example is applied in the method to explain the principle and the implementation mode of the application, and the description of the embodiment is only used for helping to understand the technical scheme and the core idea of the 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

1. The stirring speed control method based on the oil inlet pressure is characterized by being applied to a stirring speed control device based on the oil inlet pressure, the stirring speed control device based on the oil inlet pressure comprises an oil circuit unit, a degassing unit, an air circuit unit, a measuring unit and a control unit, and the stirring speed control method based on the oil inlet pressure comprises the following steps:

the control unit sends a sampling enabling signal to the oil path unit so as to reduce the pressure of an oil tank in the oil path unit to a first target pressure through an air extractor in the degassing unit and enable the oil path unit to obtain a cooling oil sample from the oil-immersed equipment;

the control unit sends degassing enabling signals 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, a first stirring speed is obtained and determined according to the viscosity of the cooling oil sample and the initial pressure in the degassing unit, and stirring of a stirring member in the degassing unit is controlled based on the first stirring speed so that the degassing unit degasses the cooling oil sample to obtain a gas sample to be tested, wherein the stirring member comprises a magnetic stirring rod arranged in the oil tank, and the magnetic stirring rod is driven by a rotating magnet arranged outside the oil tank and controlled by a second driving motor;

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;

wherein the step of obtaining and determining a first stirring speed based on the viscosity of the cooling oil sample and the initial pressure within the degassing unit comprises:

obtaining an initial pressure within the degassing unit;

acquiring the oil inlet rate of the cooling oil sample flowing into the degassing unit from the oil path unit;

determining the viscosity of the cooling oil sample based on the initial pressure and the oil feeding rate according to the incidence relation among the oil feeding rate, the viscosity and the pressure;

determining a first stirring speed of the stirring member based on the viscosity of the cooling oil sample and the target oil feeding time according to the correlation among the viscosity, the oil feeding time and the stirring speed; alternatively, the step of obtaining and determining a first stirring speed based on the viscosity of the cooling oil sample and the initial pressure within the degassing unit comprises:

obtaining an initial pressure within the degassing unit;

acquiring the oil inlet pressure of the cooling oil sample flowing into the degassing unit from the oil path unit;

determining the viscosity of the cooling oil sample based on the initial pressure and the oil inlet pressure according to the incidence relation among the oil inlet pressure, the viscosity and the pressure;

determining a first stirring speed of the stirring member based on the viscosity of the cooling oil sample and the target oil feeding time according to the correlation among the viscosity, the oil feeding time and the stirring speed;

prior to the step of controlling the agitation by the agitation member in the degassing unit based on the first agitation speed, further comprising:

obtaining the critical stirring speed of the stirring member;

judging whether the first stirring speed is greater than the critical stirring speed of the stirring member;

if the first stirring speed is greater than the critical stirring speed of the stirring member, setting the critical stirring speed as the target stirring speed of the stirring member;

and if the first stirring speed is less than the critical stirring speed of the stirring member, setting the first stirring speed as the target stirring speed of the stirring member.

2. The method of claim 1, wherein the step of determining the viscosity of the cooling oil sample based on the initial pressure and the oil feed pressure according to the correlation among oil feed pressure, viscosity and pressure comprises:

acquiring the oil inlet temperature of the cooling oil sample flowing into the degassing unit from the oil path unit;

and determining the viscosity of the cooling oil sample based on the initial pressure, the oil inlet temperature and the oil inlet pressure according to the incidence relation among the oil inlet pressure, the temperature, the viscosity and the pressure.

3. The oil feed pressure-based stirring speed control method according to claim 2, further comprising, after the step of determining the first stirring speed of the stirring member based on the viscosity of the cooling oil sample and the target oil feed time according to the correlation of the viscosity, the oil feed time, and the stirring speed:

obtaining a critical temperature of the cooling oil sample;

judging whether the oil inlet temperature of the cooling oil sample is greater than the critical temperature or not;

if the cooling oil sample is larger than the critical temperature, the critical temperature is the oil inlet temperature of the cooling oil sample, and the first stirring speed of the stirring member is determined based on the viscosity of the cooling oil sample, the critical temperature and the target oil inlet time according to the incidence relation of the temperature, the viscosity, the oil inlet time and the stirring speed.

4. The oil feed pressure based stirring speed control method of claim 1, wherein the step of determining a first stirring speed according to the viscosity of the cooling oil sample and the initial pressure inside the degassing unit comprises:

acquiring historical initial pressure in the degassing unit, historical viscosity of the cooling oil sample and historical stirring speed of the stirring member in a preset historical measurement period;

acquiring initial pressure in the degassing unit and oil inlet pressure of the cooling oil sample flowing into the degassing unit from the oil path unit in a current measurement period;

obtaining the viscosity of the cooling oil sample according to the initial pressure intensity and the oil inlet pressure;

obtaining a correlation between historical initial pressure, historical viscosity and historical stirring speed, and determining a first stirring speed of the stirring member in the current measurement period based on the initial pressure and the viscosity of the cooling oil sample in the current measurement period.

5. The oil feed pressure-based stirring speed control method according to claim 1, further comprising, after the step of setting the critical stirring speed to a target stirring speed of the stirring member:

determining the target viscosity of the cooling oil sample based on the first stirring speed and the oil inlet temperature of the cooling oil sample according to the correlation among the temperature, the viscosity and the stirring speed;

and determining the stirring temperature of the cooling oil sample based on the target viscosity and the critical stirring speed according to the correlation among the temperature, the viscosity and the stirring speed.

6. A stirring speed control device based on oil inlet pressure is characterized by comprising an oil circuit unit, a degassing unit, an air circuit unit, a measuring unit and a control unit;

the control unit is used for sending a sampling enabling signal to the oil path unit at a first moment so as to reduce the pressure of an oil tank in the oil path unit to a first target pressure through an air extractor in the degassing unit and enable the oil path unit to 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, obtaining and determining a first stirring speed according to the viscosity of the cooling oil sample and the initial pressure in the degassing unit, and controlling the stirring of a stirring member in the degassing unit based on the first stirring speed so that the degassing unit degasses the cooling oil sample to obtain a gas sample to be tested, wherein the stirring member comprises a magnetic stirring rod arranged in the oil tank, and the magnetic stirring rod is driven by a rotating magnet arranged outside the oil tank and controlled by a second driving motor;

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;

the control unit is further 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;

the degassing unit comprises an initial pressure obtaining subunit, an oil inlet speed obtaining subunit, a viscosity obtaining subunit and a stirring speed obtaining subunit;

the initial pressure obtaining sub-unit is used for obtaining the initial pressure in the degassing unit;

the oil inlet rate acquiring subunit is used for acquiring the oil inlet rate of the cooling oil sample flowing into the degassing unit from the oil path unit;

the viscosity obtaining subunit is configured to determine, according to an incidence relation among an oil feeding rate, viscosity, and pressure, a viscosity of the cooling oil sample based on the initial pressure and the oil feeding rate;

the stirring speed obtaining subunit is configured to determine, according to an association relationship between viscosity, oil inlet time, and a stirring speed, a first stirring speed of the stirring member based on the viscosity of the cooling oil sample and a target oil inlet time; or

The degassing unit is used for acquiring initial pressure in the degassing unit; acquiring the oil inlet pressure of the cooling oil sample flowing into the degassing unit from the oil path unit; determining the viscosity of the cooling oil sample according to the incidence relation among viscosity, oil inlet time and stirring speed according to the incidence relation among oil inlet pressure, viscosity and pressure, based on the initial pressure and the oil inlet pressure, and determining the first stirring speed of the stirring member based on the viscosity of the cooling oil sample and target oil inlet time;

wherein the degassing unit is further used for obtaining the critical stirring speed of the stirring member; judging whether the first stirring speed is greater than the critical stirring speed of the stirring member; if the first stirring speed is greater than the critical stirring speed of the stirring member, setting the critical stirring speed as the target stirring speed of the stirring member; and if the first stirring speed is less than the critical stirring speed of the stirring member, setting the first stirring speed as the target stirring speed of the stirring member.