CN112730538A - Insulating oil dielectric property testing device and method with adjustable temperature and humidity - Google Patents
Insulating oil dielectric property testing device and method with adjustable temperature and humidity Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 49
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
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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
Abstract
The invention relates to a temperature and humidity adjustable insulating oil dielectric property testing device and method, wherein the testing device comprises a closed box body, a liquid nitrogen pipeline, a semiconductor refrigerating sheet galvanic pile, an electric heating sheet, an ultrasonic atomization plate, a semiconductor refrigerating sheet dehumidifier and a control circuit, and a testing electrode and a probe are connected with a dielectric property testing instrument through a high-voltage sleeve and an aviation plug to realize the dielectric property testing of insulating oil in an oil cup in the box. The invention can simulate the real working conditions of the insulating oil in regions with extremely cold and high temperature, and the like, and realize the test conditions of accurate temperature and humidity control, adjustable temperature rise and drop rate, shock heating and shock cooling and the like of the insulating oil, thereby realizing the measurement of the dielectric parameters of the insulating oil under various working conditions. The dielectric parameters of the insulating oil are measured by simulating the real working conditions of the insulating oil in regions with extremely cold and high temperature, and the like, so that a theoretical basis is provided for evaluating the insulating property of the insulating oil.
Description
Technical Field
The invention relates to the field of electricity, in particular to a device and a method for testing dielectric properties of insulating oil with adjustable temperature and humidity.
Background
The insulating property of the insulating oil is not only related to electric field distribution under ultrahigh voltage, but also closely related to conditions such as environmental humidity, temperature and the like in a machine in the operation process. Temperature and moisture are important factors that affect the electrical conductivity and polarization of the insulation. When the insulating oil contains a small amount of moisture, the micro water in the insulating oil can crystallize in a low-temperature environment, and the size of ice crystal particles formed by water condensation influences the breakdown degree of the insulating oil under an extremely cold condition, so that the insulating effect of the insulating oil is greatly reduced. The machine generates heat in the running process, moisture in nearby insulating oil is likely to generate micro-water vaporization, air bubbles are retained in a temperature suddenly-changed zone, the influence of the air bubbles on the insulation problem is large, and partial breakdown discharge is likely to occur.
Insulating oil in power devices such as distribution transformers and the like in cold regions such as northeast and northwest of China can face the problem of use at the temperature as low as-50 ℃, and the insulating oil can be waxed and solidified under the condition. At present, most of the research on dielectric parameters of insulating oil at home and abroad relates to characteristic analysis at different temperatures, and few reports are made at home for simulating the real working conditions of the insulating oil, such as extremely cold conditions, high temperature conditions and different environmental humidities.
Disclosure of Invention
The invention aims to provide a temperature and humidity adjustable insulating oil dielectric property testing device and method which can simulate the real working conditions of insulating oil in regions with extremely cold and high temperature and the like, and achieve the aims of accurately controlling the temperature and humidity of the insulating oil, adjusting the temperature rise and fall rate and quenching the insulating oil by sudden heating, thereby measuring the dielectric parameters of the insulating oil in a container and providing a theoretical basis for evaluating the insulating property of the insulating oil.
In order to achieve the purpose, the technical scheme adopted by the invention is not:
the utility model provides a humiture adjustable insulating oil dielectric property testing arrangement, the device includes airtight box, liquid nitrogen pipeline, semiconductor refrigeration piece galvanic pile, electrical heating piece, ultrasonic atomization board, semiconductor refrigeration piece dehumidifier and control circuit, and wherein test electrode and probe link to each other with dielectric property testing instrument through high-voltage bushing, aviation plug, realize the insulating oil dielectric property test in the incasement oil cup.
The inner layer and the outer layer of the closed box body can be made of stainless steel, aluminum alloy, cold-rolled steel sheets and other materials, the wall thickness is 1-5mm, and the shape of the closed box body can be a cuboid or a cylinder; the middle of the outer layer and the inner layer is filled with heat insulation materials which can be glass fiber, asbestos, aerogel felt, vacuum plate and the like, and the thickness is 3-8 mm; the closed box body is provided with a box door, an observation window made of transparent materials such as glass and the like is embedded in the box door, and the observation window can be round or square so as to be convenient for observation.
The inner layer and the outer layer of the closed box body are provided with holes, so that the connection and the disconnection of a high-voltage sleeve, an air-tight aviation plug, a liquid nitrogen pipeline, a signal wire and the like are facilitated.
The oil cup shelf is horizontally placed on the shelf strips on different layers, so that the height of the oil cup in the oil cup box can be adjusted; the oil cup shelf can be made of metal or nonmetal materials such as stainless steel, aluminum alloy, glass plate and the like; holes are densely distributed on the oil cup shelf, so that air in the box body can conveniently circulate.
The liquid nitrogen pipeline is arranged between the inner layer and the outer layer of the box body, can be arranged around the box body, or is arranged on the side face of the box body and is in good contact with the inner layer of the box body through heat conduction materials such as heat conduction silicone grease, a switch valve is arranged on the pipeline, and the control circuit controls the low-temperature electric ball valve to realize the control on liquid nitrogen.
The semiconductor refrigerating sheet galvanic pile is formed by connecting 16-36 semiconductor refrigerating sheets in parallel, the power of a single semiconductor refrigerating sheet is 120W-400W, the semiconductor refrigerating sheets are uniformly distributed on the side surface or the periphery of a closed container, one surface of each semiconductor refrigerating sheet is tightly attached to the inner layer of a closed box body through heat-conducting silicone grease, the other surface of each semiconductor refrigerating sheet is tightly attached to an aluminum radiating sheet through the heat-conducting silicone grease, a fan is arranged on each radiating sheet, the overall power can be controlled by controlling the voltage and the current of the semiconductor refrigerating sheet galvanic pile and the number of working semiconductor refrigerating sheets, and the temperature change rate can be further controlled.
The electric heating sheet is composed of a heating element and an insulating material, the heating element can be made of heating materials such as nickel-chromium alloy, the heating power is controlled by controlling the voltage, and the heating temperature can reach 150 ℃.
The ultrasonic atomization plate and the semiconductor refrigeration piece dehumidifier are humidity adjusting devices, and the humidity can be controlled to be 10% -99% RH through the on-off of the relay.
The control circuit comprises a main controller, an electromagnetic valve, a relay, a pipeline fan, a temperature and humidity sensor, an LCD capacitive display screen, an ADC sampling module, a driving module and the like, and realizes temperature and humidity monitoring and control in the closed box.
The invention also provides a temperature and humidity adjustable insulating oil dielectric property testing method by utilizing the temperature and humidity adjustable insulating oil dielectric property testing device, and the testing method comprises the following steps:
(1) presetting the variation range and the variation rate of the temperature and the humidity of the environment to be simulated along with time, and realizing air circulation in the closed container through an air inlet pipe and an air outlet pipe of a pipeline fan;
(2) the temperature in the closed cavity is obtained in real time through the temperature sensor, and compared with a preset temperature change rate, the power of the semiconductor refrigerating sheet galvanic pile and the power of the electric heating sheet are adjusted in real time to achieve the purpose of conforming to the preset temperature change rate;
(3) in order to achieve the requirements of accurate control of temperature reduction and rapid temperature reduction, the invention adopts a mode of combining liquid nitrogen and a semiconductor refrigeration chip galvanic pile for refrigeration. The advantage of simple temperature control of the semiconductor refrigeration sheet galvanic pile is utilized to realize accurate control of temperature reduction. The liquid nitrogen has the fast advantage of cooling rate, and when the quenching experiment, see through the liquid nitrogen to the temperature shock drop to predetermineeing more than the temperature, guarantee cooling rate, through the cooling of semiconductor refrigeration piece pile reach predetermined temperature, guarantee temperature control's precision.
(4) The humidity in the closed cavity is obtained in real time through a humidity sensor, and is compared with a preset humidity change rate, the start and stop of an ultrasonic atomization plate and a semiconductor refrigeration piece dehumidifier in a humidity control system are controlled in real time, and the purpose that the humidity is consistent with the preset humidity change rate is achieved;
(5) and after the environment in the closed cavity is stable, the dielectric parameter value of the insulating oil in the oil cup is read in real time through a dielectric parameter measuring instrument.
The dielectric parameter measurement comprises the relative dielectric constant, dielectric loss factor, resistivity, power frequency breakdown field strength and insulation characteristics of breakdown voltage of the insulating oil, and a corresponding instrument can conveniently connect and test a test probe or an electrode through a high-voltage bushing and an aviation plug.
The invention has the beneficial effects that:
(1) in the existing insulating oil dielectric parameter test, a device and a method for simulating the actual working condition of the insulating oil are not provided, and the invention innovatively provides a device and a method for testing the dielectric parameter of the simulated insulating oil with adjustable temperature and humidity;
(2) the invention adopts a refrigeration mode combining liquid nitrogen and the semiconductor refrigeration sheet galvanic pile, and can ensure the temperature control precision on the premise of realizing quenching.
(3) The invention reserves interfaces for the design of the closed cavity, and can be conveniently and quickly accessed to most dielectric parameter measuring instruments on the market.
Drawings
FIG. 1 is a schematic structural view (front view) of the present invention;
FIG. 2 is a schematic diagram (top view) of the liquid nitrogen piping arrangement of the present invention;
FIG. 3 is a control flow chart of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the embodiments are some embodiments of the present invention, but 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 invention.
The invention relates to a temperature and humidity adjustable insulating oil dielectric property testing device and aims to achieve the purpose of temperature and humidity control by reforming a square closed container, measure the dielectric property of insulating oil in the container and analyze dielectric parameters measured by experiments, thereby providing a theoretical basis for the stable operation of the insulating oil in different environments.
The utility model provides a humiture adjustable insulating oil dielectric property testing arrangement, the device includes airtight box, liquid nitrogen pipeline, semiconductor refrigeration piece galvanic pile, electrical heating piece, ultrasonic atomization board, semiconductor refrigeration piece dehumidifier and control circuit, and wherein test electrode and probe link to each other with dielectric property testing instrument through high-voltage bushing, aviation plug, realize the insulating oil dielectric property test in the incasement oil cup.
The inner layer and the outer layer of the closed box body can be made of stainless steel, aluminum alloy, cold-rolled steel sheets and other materials, the wall thickness is 1-5mm, and the shape of the closed box body can be a cuboid or a cylinder; the middle of the outer layer and the inner layer is filled with heat insulation materials which can be glass fiber, asbestos, aerogel felt, vacuum plate and the like, and the thickness is 3-8 mm; the closed box body is provided with a box door, an observation window made of transparent materials such as glass and the like is embedded in the box door, and the observation window can be round or square so as to be convenient for observation.
The inner layer and the outer layer of the closed box body are provided with holes, so that the connection and the disconnection of a high-voltage sleeve, an air-tight aviation plug, a liquid nitrogen pipeline, a signal wire and the like are facilitated.
The oil cup shelf is horizontally placed on the shelf strips on different layers, so that the height of the oil cup in the oil cup box can be adjusted; the oil cup shelf can be made of metal or nonmetal materials such as stainless steel, aluminum alloy, glass plate and the like; holes are densely distributed on the oil cup shelf, so that air in the box body can conveniently circulate.
The liquid nitrogen pipeline is arranged between the inner layer and the outer layer of the box body, can be arranged around the box body, or is arranged on the side face of the box body and is in good contact with the inner layer of the box body through heat conduction materials such as heat conduction silicone grease, a switch valve is arranged on the pipeline, and the control circuit controls the low-temperature electric ball valve to realize the control on liquid nitrogen.
The semiconductor refrigerating sheet galvanic pile is formed by connecting 16-36 semiconductor refrigerating sheets in parallel, the power of a single semiconductor refrigerating sheet is 120W-400W, the semiconductor refrigerating sheets are uniformly distributed on the side surface or the periphery of a closed container, one surface of each semiconductor refrigerating sheet is tightly attached to the inner layer of a closed box body through heat-conducting silicone grease, the other surface of each semiconductor refrigerating sheet is tightly attached to an aluminum radiating sheet through the heat-conducting silicone grease, a fan is arranged on each radiating sheet, the overall power can be controlled by controlling the voltage and the current of the semiconductor refrigerating sheet galvanic pile and the number of working semiconductor refrigerating sheets, and the temperature change rate can be further controlled.
The electric heating sheet is composed of a heating element and an insulating material, the heating element can be made of heating materials such as nickel-chromium alloy, the heating power is controlled by controlling the voltage, and the heating temperature can reach 150 ℃.
The ultrasonic atomization plate and the semiconductor refrigeration piece dehumidifier are humidity adjusting devices, and the humidity can be controlled to be 10% -99% RH through the on-off of the relay.
The control circuit comprises a main controller, an electromagnetic valve, a relay, a pipeline fan, a temperature and humidity sensor, an LCD capacitive display screen, an ADC sampling module, a driving module and the like, and realizes temperature and humidity monitoring and control in the closed box.
The invention innovatively provides a new method for controlling the temperature and the humidity of the insulating oil and measuring parameters by utilizing the insulating oil dielectric property testing device with adjustable temperature and humidity, and particularly the method comprises the following steps:
(1) aiming at the system schematic diagram in FIG. 1, a square sealable container is adopted, a liquid nitrogen pipeline 11 is laid outside the inner layer of a box body, and the liquid nitrogen pipeline is annularly arranged around the box body for a circle; semiconductor refrigerating sheet galvanic piles 06 are distributed below the liquid nitrogen pipeline, and electric heating wires 16 are uniformly distributed below the box body; for making the temperature accurately controlled, the interior environment cooling rate of container reaches unification as far as, even there is pipeline fan 07 in the box top through the pipeline for the air in the closed container can circulate, and temperature control can be more accurate.
(2) An oil cup and an electrode 14 are arranged on a shelf 15 of the box body, a temperature sensor is arranged in the box body, and the ambient temperature in the container can be obtained in real time through an external temperature controller.
(3) The box body is connected 03 with the conductor refrigeration piece dehumidifier 01 and the ultrasonic atomization plate through a pipeline, and the humidity sensor 06 is arranged in the box body, so that the environmental humidity in the container can be measured in real time.
(4) The dielectric parameters of the insulating oil are tested by simulating the real working conditions of the insulating oil, such as under an extremely cold condition, under a high-temperature condition, under different environmental humidity conditions and under different temperature change rates.
Fig. 1 is a schematic diagram of an insulating oil dielectric property testing device with adjustable temperature and humidity, which is provided by an embodiment of the invention and mainly comprises a semiconductor refrigeration sheet dehumidifier 01, a semiconductor refrigeration sheet pile 02, an ultrasonic atomization plate 03, a pipeline fan 04/07, a temperature sensor 05, a humidity sensor 06, a heat insulation material 08, a high-voltage bushing 09, a liquid nitrogen pipeline valve 10, a liquid nitrogen pipeline 11, an aviation plug 12, a shelf strip 13, an oil cup and electrode 14, a shelf 15, an electric heating sheet 16, a sealing box door 17 and the like. The test electrode 14 is connected with an insulating oil dielectric strength tester through a high-voltage bushing 09, so that the insulating oil dielectric strength test in the oil cup in the box is realized.
The internal space size of the test box is 300 x 350mm (depth x width x height), the temperature sensor adopts a pt100 temperature sensor and is matched with a temperature controller, the temperature can be adjusted from minus 50 ℃ to 120 ℃, the temperature control range is wide, and the temperature deviation is within plus or minus 2 ℃; the cooling rate is 0.1-5 ℃/min, the heating rate is 0.1-3 ℃/min, the heating and cooling rate is high, and the experimental conditions of quenching and shock heating can be well met.
The inner layer and the outer layer of the closed box body can be made of stainless steel materials, the wall thickness of the inner layer is 2mm, the wall thickness of the outer layer is 1mm, and the shape of the closed box body can be a cuboid; asbestos heat insulation materials are added between the outer layer and the inner layer, and the thickness is 5 mm; the closed box body is provided with a box door, and a square glass observation window is embedded in the box door.
The inner layer and the outer layer of the box body are provided with holes, so that the high-voltage bushing, the air-tightness aviation plug, the liquid nitrogen pipeline, the signal wire and the like can be conveniently connected and disconnected.
The inner layer of the box body is provided with a plurality of layers of partition laths, oil cup shelves are flatly placed on the laths on different layers, and the height of the oil cups in the box can be adjusted; the oil cup shelf is made of stainless steel and is densely distributed with holes, so that air in the box body can conveniently circulate.
FIG. 2 is an arrangement schematic diagram of a liquid nitrogen pipeline of the insulating oil dielectric property testing device, wherein the liquid nitrogen pipeline is arranged between an inner layer and an outer layer of a box body and arranged around the box body, the liquid nitrogen pipeline is in good contact with the inner layer of the box body through heat conduction silicone grease, a switch valve is arranged on the pipeline, and a control circuit controls a low-temperature electric ball valve to realize the control of liquid nitrogen.
The semiconductor refrigeration piece galvanic pile is formed by connecting 10 semiconductor refrigeration pieces in parallel, the power of a single semiconductor refrigeration piece is 120W, the semiconductor refrigeration pieces are uniformly distributed on the side surface or the periphery of the closed container, one surface of each semiconductor refrigeration piece is tightly attached to the inner layer of the closed box body through heat-conducting silicone grease, the other surface of each semiconductor refrigeration piece is tightly attached to an aluminum radiating fin through the heat-conducting silicone grease, a fan is arranged on each radiating fin, the overall power can be controlled by controlling the voltage and the current of the semiconductor refrigeration piece galvanic pile and the number of working semiconductor refrigeration pieces, and the temperature change rate is further controlled.
The electric heating sheet is composed of a heating element and an insulating material, the heating element is made of a nickel-chromium alloy heating material, heating power is controlled by controlling voltage, and heating temperature can reach 150 ℃.
The ultrasonic atomization plate and the semiconductor refrigeration piece dehumidifier are humidity adjusting devices, and the humidity can be controlled to be 10-99% RH by switching on and off the relay.
The control circuit comprises a main controller, an electromagnetic valve, a relay, a pipeline fan, a temperature and humidity sensor, an LCD capacitive display screen, an ADC sampling module, a driving module and the like, and realizes the temperature and humidity monitoring and control in the closed box body.
Fig. 3 is a control flow chart of the insulating oil dielectric property testing device with adjustable temperature and humidity, wherein the working conditions of the simulated insulating oil are as follows, the initial temperature is T1, the environmental humidity is H1, the water content of the insulating oil is W1, the temperature is changed into T0 when a cold tide comes, the environmental humidity is changed into H0, and the control flow specifically comprises the following steps:
(1) insulating oil with the water content of W1 is filled in the experimental oil cup, the initial temperature is T1, the environmental humidity is H1, and the centrifugal fan is turned on to stabilize the temperature and the humidity in the container;
(2) acquiring the temperature T1 and the humidity H1 in the closed container in real time through a temperature and humidity sensor, calculating a difference Te which is 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 adjusting the power of the cooling and heating device according to the size of | Te |;
(3) and calculating the difference He as H1-H0 according to the humidity H0 corresponding to the time point, if the He is greater than 0, starting the dehumidifying device, closing the humidifying device, if the He is less than 0, starting the humidifying device, closing the dehumidifying device, and adjusting the power of the humidifying device and the dehumidifying device according to the magnitude of | He |.
(4) In the cooling process, the temperature in the insulating oil, the temperature in the box body and the humidity can be recorded in real time, the dielectric parameters of the insulating oil in the temperature change process can be recorded in real time, the actual working environment of the insulating oil is simulated, and the insulating property of the insulating oil is evaluated.
Those not described in detail in this specification are within the knowledge of those skilled in the art.
Claims (10)
1. The utility model provides a humiture adjustable insulating oil dielectric property testing arrangement, a serial communication port, testing arrangement includes airtight box, liquid nitrogen pipeline, semiconductor refrigeration piece galvanic pile, electric heating plate, ultrasonic atomization board, semiconductor refrigeration piece dehumidifier and control circuit, test electrode and probe pass through high-voltage bushing, aviation plug and link to each other with dielectric property testing instrument.
2. The insulating oil dielectric property testing device with adjustable temperature and humidity according to claim 1, wherein the inner layer and the outer layer of the closed box body are made of stainless steel, aluminum alloy or cold-rolled steel plate, the wall thickness is 1-5mm, and the shape of the closed box body can be a cuboid or a cylinder; the middle of the outer layer and the inner layer is filled with an oil heat insulation material, the oil heat insulation material is glass fiber, asbestos, aerogel felt or a vacuum plate, and the thickness is 3-8 mm; the closed box body is provided with a box door, an observation window made of transparent materials such as glass and the like is embedded in the box door, and the observation window can be round or square; holes are arranged on the inner layer and the outer layer of the box body of the closed box body.
3. The insulating oil dielectric property testing device with adjustable temperature and humidity according to claim 1, characterized in that a plurality of layers of shelf strips are processed on the inner layer of the box body of the closed box body, oil cup shelves are flatly placed on the shelf strips on different layers, and the height of the oil cups in the box body can be adjusted; the oil cup shelf can be made of metal or nonmetal materials such as stainless steel, aluminum alloy, glass plate and the like; holes are densely distributed on the oil cup shelf, so that air in the box body can conveniently circulate.
4. The insulating oil dielectric property testing device with adjustable temperature and humidity according to claim 1, wherein the liquid nitrogen pipeline is arranged between the inner layer and the outer layer of the box body and surrounds the box body, or is arranged on the side face of the box body and is in good contact with the inner layer of the box body through heat conduction materials such as heat conduction silicone grease and the like, a switch valve is arranged on the pipeline, and the control circuit controls the low-temperature electric ball valve to realize control over liquid nitrogen.
5. The insulating oil dielectric property testing device with adjustable temperature and humidity according to claim 1, wherein the semiconductor refrigeration piece electric pile is formed by connecting 16-36 semiconductor refrigeration pieces in parallel, the power of a single semiconductor refrigeration piece is 100W-400W, the semiconductor refrigeration pieces are uniformly distributed on the side surface or the periphery of the closed container, one surface of each semiconductor refrigeration piece is tightly attached to the inner layer of the closed box body through heat-conducting silicone grease, the other surface of each semiconductor refrigeration piece is tightly attached to an aluminum cooling fin through the heat-conducting silicone grease, a fan is arranged on each cooling fin, the overall power is controlled by controlling the voltage and the current of the semiconductor refrigeration piece electric pile and the number of working semiconductor refrigeration pieces, and the temperature change rate is further controlled.
6. The insulating oil dielectric property testing device with adjustable temperature and humidity according to claim 1, wherein the electric heating sheet comprises a heating element and an insulating material, the heating element is a nichrome heating material, heating power is controlled by controlling voltage, and heating temperature can reach 150 ℃.
7. The insulating oil dielectric property testing device with adjustable temperature and humidity as claimed in claim 1, wherein the ultrasonic atomization plate and the semiconductor refrigeration sheet dehumidifier are humidity adjusting devices, and the humidity can be controlled at 10% -99% RH by switching on and off of a relay.
8. The insulating oil dielectric property testing device with adjustable temperature and humidity according to claim 1, wherein the control circuit comprises a main controller, an electromagnetic valve, a relay, a pipeline fan, a temperature and humidity sensor, an LCD capacitive display screen, an ADC sampling module and a driving module, and the control circuit monitors and controls the temperature and the humidity in the closed box body.
9. The insulating oil dielectric property testing device with adjustable temperature and humidity according to any one of claims 1 to 8, wherein the testing method of the device comprises the following steps:
(1) presetting the change range and the change rate of the temperature and the humidity of the environment along with the time;
(2) air circulation in the closed container is realized through an air inlet pipe and an air outlet pipe of the pipeline fan;
(3) the temperature in the closed cavity is obtained in real time through the temperature sensor, and compared with a preset temperature change rate, the power of the semiconductor refrigerating sheet galvanic pile and the power of the electric heating sheet are adjusted in real time to reach the preset temperature change rate;
(4) the humidity in the closed cavity is obtained in real time through a humidity sensor, and compared with a preset humidity change rate, the start and stop of an ultrasonic atomization plate and a semiconductor refrigeration piece dehumidifier in a humidity control system are controlled in real time, so that the preset humidity change rate is realized;
(5) and after the environment in the closed cavity is stable, the dielectric parameter value of the insulating oil in the oil cup is read in real time through a dielectric parameter measuring instrument.
10. The method for testing dielectric properties of insulating oil with adjustable temperature and humidity according to claim 9, wherein the dielectric parameter measurement in step (5) comprises relative dielectric constant, dielectric loss factor, resistivity, power frequency breakdown field strength and breakdown voltage insulation properties of insulating oil, and a corresponding instrument can conveniently connect and test a test probe or an electrode through a high voltage bushing and an aviation plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116125147A (en) * | 2022-11-22 | 2023-05-16 | 西南交通大学 | Evaluation method of dry type transformer insulating material in high-temperature and high-humidity environment |
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