CN112798468A - Transformer oil viscosity measuring device and method under simulated real environment - Google Patents
Transformer oil viscosity measuring device and method under simulated real environment Download PDFInfo
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- CN112798468A CN112798468A CN202110004052.6A CN202110004052A CN112798468A CN 112798468 A CN112798468 A CN 112798468A CN 202110004052 A CN202110004052 A CN 202110004052A CN 112798468 A CN112798468 A CN 112798468A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 238000002474 experimental method Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 8
- 238000005057 refrigeration Methods 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 4
- 239000004519 grease Substances 0.000 claims description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims 2
- 238000000605 extraction Methods 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 239000000243 solution Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 3
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- 238000011160 research Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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Abstract
The invention discloses a device and a method for measuring transformer oil viscosity under a simulated real environment, which comprises a closed measuring chamber, a viscosity sensor, a temperature and humidity sensor, a heating device, a cooling device, a humidifying device, a dehumidifying device, an air extracting fan and an air supplying fan, wherein the closed measuring chamber is used for isolating air in the closed measuring chamber from an external environment, the viscosity sensor is used for monitoring the viscosity value of transformer oil, the temperature and humidity sensor is used for monitoring the temperature and humidity of the air in the closed measuring chamber, the heating device and the cooling device are respectively used for increasing and decreasing the air temperature in the closed measuring chamber, the humidifying device and the dehumidifying device are respectively used for increasing and decreasing the air humidity in the closed measuring chamber, and the air extracting fan and the air supplying fan are used for realizing air circulation in the closed measuring chamber. The invention can simulate the change of humidity and temperature in the real natural environment, measure the viscosity of the transformer oil under the condition and provide reference for researching the change of the viscosity of the transformer oil along with the change of the air temperature and the humidity.
Description
Technical Field
The invention relates to the field of electricity, in particular to a device and a method for measuring viscosity of transformer oil under a simulated real environment.
Background
In an oil-immersed power transformer, transformer oil is used as an insulating medium and a cooling medium, and insulating paper boards and paper are used as solid insulation, so that various electrical elements are separated, and the normal operation of the transformer is ensured.
China is wide in territory, the extreme temperature in northeast, northwest and other regions can reach minus 50 ℃, the viscosity of the transformer oil can be obviously increased under the condition, the fluidity is obviously reduced, the heat dissipation capability is obviously reduced, and the phenomena of easy wax deposition, condensation, unsafe relay protection misoperation and the like occur. In addition, moisture may be brought into the transformer oil in the processes of transportation and injection into the transformer, and under the condition, the viscosity of the transformer oil is influenced by the micro-water in the transformer oil, so that the safety performance of the transformer is influenced.
In summary, the adverse effect of the low-temperature environment on the transformer oil is great, and particularly, the viscosity of the transformer oil is greatly adversely affected, and in order to research the viscosity of the transformer oil, a method for measuring the viscosity value is required, but the existing transformer oil viscosity measuring devices do not consider the influence of the change rate of the humidity and the temperature on the viscosity of the transformer oil, and the measured viscosity value fluctuates greatly and is inaccurate, so that a method for simulating the measurement of the viscosity of the transformer oil under the real condition is urgently needed to research the viscosity change of the transformer oil under the condition.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the viscosity of transformer oil under a real condition, which consider the influence of temperature, humidity and the change rate of the temperature and the humidity on the viscosity of the transformer oil.
In order to achieve the purpose, the transformer oil viscosity measuring device designed by the invention under the simulated real environment comprises a closed measuring chamber, a viscosity sensor, a temperature and humidity sensor, a heating device, a cooling device, a humidifying device, a dehumidifying device, an air extracting fan and an air supplying fan, wherein a container for containing the transformer oil is arranged in the closed measuring chamber, the closed measuring chamber is used for isolating the air in the closed measuring chamber from the external environment, the viscosity sensor is used for monitoring the viscosity value of the transformer oil, the temperature and humidity sensor is used for monitoring the temperature and humidity of the air in the closed measuring chamber, the heating device is used for increasing the air temperature in the closed measuring chamber, the cooling device is used for reducing the air temperature in the closed measuring chamber, the humidifying device is used for increasing the air humidity in the closed measuring chamber, the dehumidifying device is used for reducing the air humidity in the closed measuring chamber, and the air extracting, the air supply fan is used for recharging the extracted air into the closed measuring chamber so as to realize air circulation in the closed measuring chamber.
A method for measuring the viscosity of transformer oil under a simulated real environment comprises the following steps:
the method comprises the following steps: presetting a time-dependent change curve of the temperature T0 and the humidity H0 in the environment to be simulated in the closed measuring chamber within a preset time;
step two: starting an air exhaust fan and an air supply fan to realize air circulation in the closed measuring room;
step three: acquiring the temperature T1 and the humidity H1 in a closed measuring room in real time through a temperature and humidity sensor, calculating a difference Te (T1-T0) according to the temperature T0 of a corresponding time point, if Te is greater than 0, starting a cooling device, closing the heating device, if Te is less than 0, starting the heating device, closing the cooling device, and ensuring that the temperature difference Te is less than or equal to a preset temperature allowable error threshold n; calculating a difference value He (H1-H0) according to the humidity H0 preset in the first step and corresponding to the time point, if the He is greater than 0, starting a dehumidifying device, closing the humidifying device, if the He is less than 0, starting the humidifying device, closing the dehumidifying device, and ensuring that the humidity difference | He | is less than or equal to a preset humidity allowable error threshold m;
step four: the viscosity value of the transformer oil in the container in the preset time is read in real time through the viscosity sensor, and the measurement of the viscosity of the transformer oil in the real environment is simulated.
The transformer oil viscosity measuring device and the control method thereof have the advantages that the influence of the temperature, humidity and temperature and humidity change rate on the transformer oil viscosity is considered, the temperature and humidity environment under the real condition of the temperature and humidity change rate along with the time of the preset period of time can be used for measuring the viscosity of the transformer oil in the environment, and reliable reference data are provided for researching the physical property characteristics of the transformer oil.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention;
FIG. 2 is a schematic view of a cooling device according to the present invention;
FIG. 3 is a flow chart of a control method of the present invention;
wherein, 1-objective table, 3-transformer oil, 4-container, 5-closed measuring chamber, 6-temperature and humidity sensor, 7-viscosity sensor, 8-experimental door, 9-heating device, 10-cooling device, 11-humidifying device, 12-dehumidifying device, 13-air extracting fan, 14-air supplying fan, 15-air extracting pipe, 16-air supplying pipe, 21-semiconductor refrigerating sheet, 22-cold sheet pile, 23-aluminum radiating fin, 24-radiating fan
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the invention relates to a transformer oil viscosity measuring device under a simulated real environment, which comprises a closed measuring chamber 5, a viscosity sensor 7, a temperature and humidity sensor 6, a heating device 9, a cooling device 10, a humidifying device 11, a dehumidifying device 12, an air extracting fan 13 and an air feeding fan 14, wherein a container 4 for containing transformer oil 3 is arranged in the closed measuring chamber 5, the closed measuring chamber 5 is used for isolating the air in the closed measuring chamber 5 from the external environment, the viscosity sensor 7 is used for monitoring the viscosity value of the transformer oil 3, the temperature and humidity sensor 6 is used for monitoring the temperature and humidity of the air in the closed measuring chamber 5, the heating device 9 is used for increasing the air temperature in the closed measuring chamber 5, the cooling device 10 is used for reducing the air temperature in the closed measuring chamber 5, the humidifying device 11 is used for increasing the air humidity in the closed measuring chamber 5, and the dehumidifying device 12 is used for reducing the air humidity in the closed measuring chamber 5, the air extracting fan 13 is for extracting air from the closed measuring chamber 5, and the air sending fan 14 is for refilling the extracted air into the closed measuring chamber 5 to realize air circulation in the closed measuring chamber 5.
In the above technical scheme, the device for measuring the viscosity of the transformer oil under the simulated real environment further comprises an air exhaust pipe 15 and an air supply pipe 16, wherein the air exhaust pipe 15 is connected between the input end of the air exhaust fan 13 and the air exhaust opening of the closed measuring chamber 5, and the air supply pipe 16 is connected between the output end of the air supply fan 14 and the air supply opening of the closed measuring chamber 5.
In the technical scheme, a hole is formed in the top of the closed measuring chamber 5 and used for mounting the viscosity sensor 7, a probe of the viscosity sensor 7 is wrapped in the transformer oil 3, another hole is formed in the top of the closed measuring chamber 5 and used for mounting the temperature and humidity sensor 6, the probe of the temperature and humidity sensor 6 is located in the closed measuring chamber 5, the cooling device 10 is mounted on the side face of the closed measuring chamber 5, and an air exhaust pipe 15 and an air supply pipe 16 are formed in the side face of the closed measuring chamber 5.
In the technical scheme, an input end of the air exhaust pipe 15 is communicated with the closed measuring chamber 5, an output end of the air exhaust pipe 15 is communicated with an input end of an air exhaust fan 13, a pipeline between an output end of the air exhaust fan 13 and an input end of an air supply fan 14 is provided with a humidifying device 11 and a dehumidifying device 12, an output end of the air supply fan 14 is connected with an input end of an air supply pipe 16, an output end of the air supply pipe 16 is communicated with the closed measuring chamber 5, a heating device 9 is installed at an air exhaust opening in the closed measuring chamber 5, the heating device 9 is 1-2 cm away from the air exhaust opening, a heating device 9 is installed at an air supply opening in the closed measuring chamber 5, and the heating device 9 is 1-2 cm away from the air supply opening.
Among the above-mentioned technical scheme, transformer oil viscosity measuring device under simulation real environment still includes experiment door 8 and objective table 1, experiment door 8 is used for opening and closes airtight measuring room 5, objective table 1 is used for placing container 4.
In the technical scheme, the experiment door 8 is installed on the top surface of the closed measuring chamber 5, the measuring chamber rubber sealing strip is installed on the experiment door 8, the viscosity sensor 7 penetrates through the central position of the experiment door 8 through an opening, the objective table 1 is fixed in the center of the bottom of the closed measuring chamber 5, and the height of the transformer oil 3 contained in the container 4 ensures that the transformer oil 3 can wrap the probe of the viscosity sensor 7.
Among the above-mentioned technical scheme, as shown in fig. 2, heat sink 10 includes refrigeration piece galvanic pile 22, aluminium fin 23 and radiator fan 24, refrigeration piece galvanic pile 22 can realize the cooling and be used for simulating real ambient temperature and change, the one side of refrigeration piece galvanic pile 22 is pasted on the outer wall of airtight measuring chamber 5 through heat conduction silicone grease, the another side of refrigeration piece galvanic pile 22 is pasted on the one side 23 of aluminium fin through heat conduction silicone grease, radiator fan 24 is installed to the another side of aluminium fin 23.
In the above technical scheme, the chilling plate electric pile 22 is formed by connecting a plurality of semiconductor chilling plates 21 side by side, and the cooling rate is controlled by controlling the voltage and the current of the chilling plate electric pile 22 and the number of the semiconductor chilling plates 21.
In the above technical solution, the temperature raising device 9 is an electric heating wire, and the heating rate is controlled by controlling the current of the electric heating wire.
In the above technical solution, the material of the closed measuring chamber 5 may preferably be stainless steel, aluminum alloy or cold-rolled steel plate, the wall thickness is preferably 1-3mm, and the shape may be a cuboid, a cube or a cylinder.
In the above technical solution, the material of the sealed measuring chamber 5 is preferably stainless steel, the wall thickness of the sealed measuring chamber 5 is preferably 2mm, the shape is preferably cubic, the size is 200mm x 200mm, and the size of the experimental door 8 arranged at the top of the sealed measuring chamber 5 is 180mm x 180 mm.
In the above technical solution, the material of the stage 1 may preferably be heat conductive and insulating alumina ceramic or heat conductive and insulating rubber, the shape may be a cuboid, a cube or a cylinder, and the size of the stage 1 is preferably 150mm by 20 mm.
In the above technical solution, the size of the container 4 placed on the stage 1 is preferably 800ml, and the transformer oil 3 contained in the container 4 is 45# transformer oil.
In the technical scheme, the refrigerating sheet galvanic pile 22 can be formed by connecting 16-36 semiconductor refrigerating sheets in parallel, the power of a single semiconductor refrigerating sheet is 120W-400W, and the refrigerating sheet galvanic pile 22 can be uniformly arranged around the closed measuring chamber 5.
In the above technical solution, the power of the heating wire is preferably 300W-3000W.
In the above technical solution, the humidifying device 11 may be a spray humidifier.
In the above technical solution, the dehumidifier 12 may be a dynamic solid adsorption dehumidifier.
In the above technical solution, the temperature and humidity sensor 6 can normally operate at least at-40 ℃, and the model thereof can be 485 type temperature and humidity sensor.
In the above technical solution, the viscosity sensor 7 can normally work at least at-40 ℃, and its model can be XL7 online viscometer.
In the above technical solution, the model of the semiconductor cooling plate 21 is preferably TEC-12710, the power is 120W, and the size is 40mm by 3.4 mm.
A control method for a device for simulating the viscosity measurement of transformer oil in a real environment is shown in figure 3, and comprises the following steps:
the method comprises the following steps: presetting the change curves of the temperature T0 and the humidity H0 in the preset time of the environment to be simulated in the closed measuring chamber 5 along with the time;
step two: starting an air extracting fan 13 and an air feeding fan 14 to realize air circulation in the closed measuring chamber 5;
step three: the temperature T1 and the humidity H1 in the closed measuring chamber 5 are obtained in real time through the temperature and humidity sensor 6, the difference Te is T1-T0 according to the temperature T0 of the corresponding time point, if Te is greater than 0, the temperature reduction device 10 is started, the temperature rise device 9 is closed, if Te is less than 0, the temperature rise device 9 is started, the temperature reduction device 10 is closed, the temperature rise rate and the temperature reduction rate of the temperature rise device 9 and the temperature reduction device 10 are adjusted according to the temperature difference | Te |, and the temperature difference | Te | is less than or equal to a preset temperature allowable error threshold value n; and calculating the difference He as H1-H0 according to the humidity H0 preset in the step one at the corresponding time point, if the He is greater than 0, starting the dehumidifying device 12, closing the humidifying device 11, if the He is less than 0, starting the humidifying device 11, closing the dehumidifying device 12, and adjusting the power of the humidifying device 11 and the dehumidifying device 12 according to the size of the humidity difference | He |, so as to ensure that the humidity difference | He | is less than or equal to the preset humidity allowable error threshold m.
Step four: the viscosity value of the transformer oil 3 in the container 4 in the preset time is read in real time through the viscosity sensor 7, so that the measurement of the viscosity of the transformer oil in the real environment is simulated.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (10)
1. The utility model provides a transformer oil viscosity measuring device under simulation real environment which characterized in that: the device comprises a closed measuring chamber (5), a viscosity sensor (7), a temperature and humidity sensor (6), a heating device (9), a cooling device (10), a humidifying device (11), a dehumidifying device (12), an air extracting fan (13) and an air feeding fan (14), wherein a container (4) for containing transformer oil (3) is arranged in the closed measuring chamber (5), the closed measuring chamber (5) is used for isolating air in the closed measuring chamber (5) from the external environment, the viscosity sensor (7) is used for monitoring the viscosity value of the transformer oil (3), the temperature and humidity sensor (6) is used for monitoring the temperature and humidity of the air in the closed measuring chamber (5), the heating device (9) is used for increasing the air temperature in the closed measuring chamber (5), the cooling device (10) is used for reducing the air temperature in the closed measuring chamber (5), the humidifying device (11) is used for increasing the air humidity in the closed measuring chamber (5), the dehumidifying device (12) is used for reducing the air humidity in the closed measuring chamber (5), the air extracting fan (13) is used for extracting the air in the closed measuring chamber (5), and the air feeding fan (14) is used for refilling the extracted air into the closed measuring chamber (5) so as to realize the air circulation in the closed measuring chamber (5).
2. The device for measuring the viscosity of the transformer oil in the simulated real environment according to claim 1, wherein: the device also comprises an air exhaust pipe (15) and an air supply pipe (16), wherein the air exhaust pipe (15) is connected between the input end of the air exhaust fan (13) and the air exhaust opening of the closed measuring chamber (5), and the air supply pipe (16) is connected between the output end of the air supply fan (14) and the air supply opening of the closed measuring chamber (5).
3. The device for measuring the viscosity of the transformer oil in the simulated real environment according to claim 2, wherein: a hole is opened at the top of airtight measuring chamber (5) and is used for installing viscosity sensor (7), the probe parcel of viscosity sensor (7) is in transformer oil (3), another hole is opened at the top of airtight measuring chamber (5) and is used for installing temperature and humidity sensor (6), the probe of temperature and humidity sensor (6) is located airtight measuring chamber (5), side-mounting heat sink (10) of airtight measuring chamber (5), the side trompil of airtight measuring chamber (5) is used for installing exhaust tube (15) and air feed pipe (16).
4. The device for measuring the viscosity of the transformer oil in the simulated real environment according to claim 2, wherein: the one end and the airtight measuring chamber (5) intercommunication of exhaust tube (15), the other end and the input intercommunication of bleed fan (13) of exhaust tube (15), be provided with humidification device (11) and dehydrating unit (12) in the pipeline between the output of bleed fan (13) and air supply fan (14) input, the other end of air supply fan (14) links to each other with the one end of air supply pipe (16), the output and the airtight measuring chamber (5) intercommunication of air supply pipe (16), rising temperature equipment (9) are installed to the extraction opening of airtight measuring chamber (5), rising temperature equipment (9) are installed to the air supply opening of airtight measuring chamber (5).
5. The device for measuring the viscosity of the transformer oil in the simulated real environment according to claim 1, wherein: the device also comprises an experiment door (8) and an object stage (1), wherein the experiment door (8) is used for opening and closing the closed measuring chamber (5), and the object stage (1) is used for placing the container (4).
6. The device for measuring the viscosity of the transformer oil in the simulated real environment according to claim 5, wherein: experiment door (8) are installed at airtight measurement room (5) top surface, be equipped with measurement room rubber sealing strip on experiment door (8), viscosity sensor (7) pass the central point of experiment door (8) through the trompil and put, the bottom central authorities at airtight measurement room (5) are fixed in objective table (1), the probe that viscosity sensor (7) can be wrapped up in transformer oil (3) is highly will guaranteed in transformer oil (3) of splendid attire in container (4).
7. The device for measuring the viscosity of the transformer oil in the simulated real environment according to claim 1, wherein: cooling device (10) are including refrigeration piece pile (22), aluminium fin (23) and radiator fan (24), refrigeration piece pile (22) can realize the cooling and be used for simulating real ambient temperature and change, the one side of refrigeration piece pile (22) is pasted on the outer wall of airtight measuring chamber (5) through heat conduction silicone grease, the one side (23) of pasting at aluminium fin through heat conduction silicone grease of the another side of refrigeration piece pile (22), radiator fan (24) are installed to the another side of aluminium fin (23).
8. The device for measuring the viscosity of the transformer oil in the simulated real environment according to claim 1, wherein: the refrigerating piece galvanic pile (22) is formed by connecting a plurality of semiconductor refrigerating pieces (21) side by side, and the cooling rate is controlled by controlling the voltage and the current of the refrigerating piece galvanic pile (22) and the number of the semiconductor refrigerating pieces (21).
9. The device for measuring the viscosity of the transformer oil in the simulated real environment according to claim 1, wherein: the temperature raising device (9) is an electric heating wire, and the heating rate is controlled by controlling the current of the electric heating wire.
10. A method for measuring the viscosity of transformer oil in a simulated real environment by using the device of claim 1, which is characterized by comprising the following steps:
the method comprises the following steps: presetting the change curves of the temperature T0 and the humidity H0 in the preset time of the environment to be simulated in the closed measuring chamber (5) along with the time;
step two: starting an air exhaust fan (13) and an air supply fan (14) to realize air circulation in the closed measuring chamber (5);
step three: the temperature T1 and the humidity H1 in the closed measuring chamber (5) are obtained in real time through a temperature and humidity sensor (6), the difference Te is calculated to be T1-T0 according to the temperature T0 of the corresponding time point, if Te is greater than 0, a cooling device (10) is started, a heating device (9) is closed, if Te is less than 0, the heating device (9) is started, the cooling device (10) is closed, and the temperature difference | Te | is less than or equal to a preset temperature allowable error threshold value n; calculating a difference He (H1-H0) according to the humidity H0 preset in the first step and corresponding to the time point, if the He is greater than 0, starting a dehumidifying device (12), closing a humidifying device (11), if the He is less than 0, starting the humidifying device (11), closing the dehumidifying device (12), and ensuring that the humidity difference | He | is less than or equal to a preset humidity allowable error threshold m;
step four: the viscosity value of the transformer oil (3) in the container (4) in the preset time is read in real time through the viscosity sensor (7), so that the viscosity measurement of the transformer oil in the real environment is simulated.
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