CN114660423A - Device and method for simulation experiment of generation of oiled paper insulation bubbles in multiple physical fields - Google Patents
Device and method for simulation experiment of generation of oiled paper insulation bubbles in multiple physical fields Download PDFInfo
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- CN114660423A CN114660423A CN202210274671.1A CN202210274671A CN114660423A CN 114660423 A CN114660423 A CN 114660423A CN 202210274671 A CN202210274671 A CN 202210274671A CN 114660423 A CN114660423 A CN 114660423A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention relates to a device and a method for generating and simulating bubbles in oil paper insulation of a transformer/high-voltage reactor in multiple physical fields. The electrodes can be manually adjusted in distance under the action of the fixing device. The temperature range of the insulating oil can be adjusted between 0 ℃ and 150 ℃ under the control of a temperature control box. The box body is rigidly connected with the vibration device through a clamping device, and the vibration frequency range is 5Hz-5 kHz. The top cover is installed at the top of the experimental oil tank, a hole is formed in the middle of the top cover, a copper bar is screwed in the hole, and insulation paper is wrapped outside the copper bar and used for simulating a winding of a transformer/high-voltage reactor. The device comprehensively considers the effects of multiple physical fields such as an electric field, a temperature field, a flow field and the like so as to simulate the internal complex stress environment of the actual oil-immersed power equipment, and has the characteristic of semi-automation.
Description
Technical Field
The invention belongs to the field of fault simulation and prevention of oil-immersed electrical equipment, and particularly relates to a device and a method for a simulation experiment of bubble generation in oil paper insulation of a transformer/high-voltage reactor in multiple physical fields.
Background
At present, most high-voltage reactors/power transformers in a power grid are oil-immersed, and under the long-term action of an electric field, a vibration field and a thermal field, the main component cellulose in insulating paper is decomposed and separated out to obtain more single molecules such as moisture, gas and the like, and the single molecules are aggregated under the combined action of external factors such as the electric field, the vibration field, the thermal field and the like and polymerized to form micro bubbles under certain conditions. The insulating oil contains a certain amount of gas as a main component except for alkane. The gas dissolving amount of the common insulating oil is about 9 percent, and when the internal temperature and pressure of equipment such as a transformer and the like greatly fluctuate, the gas dissolved in the oil gradually precipitates from the oil and is suspended in the transformer oil in the form of micro-bubbles or attached to the surface of insulating paper. The content of water and gas micromolecules in the transformer oil paper insulation is in dynamic balance, the temperature is an important factor influencing the dynamic balance, the existence of the water and gas micromolecules can damage the insulation performance of the high-voltage reactor/power transformer, the cellulose aging is accelerated, and finally bubbles can be caused. Along with the rapid fluctuation of the transformer load, the small bubble precipitation rate can be accelerated by the action of multiple physical fields, so that water and gas molecules are promoted to migrate and redistribute between oil and paper, bubbles are formed to be attached to the insulating surface of the oil paper or in the oil and are accumulated to form a bridge, the insulating level of the transformer is reduced, and partial discharge and even insulation breakdown occur. At present, the generation rule of bubbles and the influence degree of the bubbles on insulation are not very clear, so that the research on the influence of different temperature changes, moisture contents, electric field strengths and vibration strengths on the formation of the oiled paper insulation bubbles has important value.
Disclosure of Invention
The invention designs a device and a method for a simulation experiment of bubble generation in oil paper insulation of a transformer/high-voltage reactor under multiple physical fields, the device can simulate the phenomena of gas separation and bubble generation under the action of the multiple physical fields such as an electric field, a temperature field, a vibration field and the like in an oil paper insulation system, and obtain corresponding characteristics, and the device can comprehensively simulate multiple physical environments in the oil paper insulation system and has the characteristic of semi-automation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the measuring device comprises an experiment box body, a high-voltage source, electrodes and fixing devices thereof, a temperature control device, a vibration device, a high-speed camera, a bubble generation module and the like. The horizontal distance between the two electrodes can be adjusted by the electrodes under the action of the fixing device. The temperature range of the insulating oil can be adjusted between 0 ℃ and 150 ℃ under the control of a temperature control box. The box body is fixedly connected with the vibrating device through a rigid device, and the vibration frequency range is 5Hz-5 kHz. The top cover is installed at the top of the experimental oil tank, a hole is formed in the middle of the top cover, a copper bar is screwed in the hole, and insulating paper is wrapped outside the copper bar and used for simulating a winding of a transformer/high-voltage reactor. The device comprehensively considers the effects of multiple physical fields such as an electric field, a temperature field, a vibration field and the like so as to simulate the internal complex stress environment of the actual oil-immersed power equipment, and has the characteristic of semi-automation.
Further, the electrodes are fixed by two polytetrafluoroethylene sleeves, and the electrode distance is adjusted through threads inside the sleeves.
Furthermore, a hollow glass tube is welded at the bottom of the oil tank, a Pt100 type thermal resistance heating rod is inserted into the tube, the heating rod is connected with a temperature control box, and the temperature can be maintained at any temperature value within 0-150 ℃ under the action of an intelligent temperature controller, so that the internal temperature of the transformer under different load conditions can be simulated.
Further, the insulating paper after drying is wound on the copper bar of the screw-in top cover, the winding inside the transformer is simulated, the heating rod heats the oil tank to enable the insulating temperature of the oil paper around the winding to rise, along with the rise of the temperature of the winding of the simulated transformer, bubbles are generated on the surface of the insulating paper, and the observation of the bubble generation process can be realized through the side wall of the oil tank.
Further, vibration platform and experiment oil tank are through two rigidity clamping device locking connection, can even box pressure to the protection box does not take place to damage, avoids the oil tank to take place to slide simultaneously.
Further, the device for simulating the generation of the bubbles in the oil paper insulation of the transformer/high-voltage reactor in the multi-physical field is used for carrying out experiments, and the position of a high-speed camera and the intensity of a light supplement lamp are adjusted firstly, so that a clear image can be obtained from the camera as a standard; controlling the oil temperature in an oil tank of the tank by using the temperature; adjusting the heights of the insulating paper and the copper bar; setting required voltage by using an alternating current/direct current high-voltage source, and adjusting a signal generator and a power amplifier to apply required vibration to the box body, thereby realizing the coupling of an electric field, a temperature field and a vibration field; changing parameters such as vibration parameters, water content of insulating oil, oil temperature and the like, continuously increasing the external voltage until bubbles are generated, observing the generation and migration processes of the bubbles by using a high-speed microscopic camera, and analyzing the characteristics of the bubble generation process by using a computer.
The invention has the beneficial effects that: the measuring device can realize observation of the bubble generation process in the oil paper insulation system under multiple physical fields, the simulated complex multi-physical field environment conforms to the internal environment of the actual oil-immersed power equipment, the purpose of observation of the bubble generation process under the conditions of different temperatures, different moisture contents, different electric field strengths and different vibration frequencies is realized, and the simulation process is consistent with the actual working condition of the transformer. The basic requirements of bubble generation characteristic observation experiments in the oil paper insulation in multiple physical fields are met.
Drawings
FIG. 1 is an overall configuration diagram of an apparatus for measuring a bubble generation characteristic in an oil-paper insulation under a multi-physical field.
FIG. 2 is a flow chart of a method for measuring the bubble bridging property in the oilpaper insulation under multiple physical fields.
The notation in the figure is:
the device comprises a Pt100 resistance type heating rod-1, a copper rod-2, a polytetrafluoroethylene sleeve-3, a high-voltage electrode-4, insulating paper-5, a temperature thermocouple-6, a top cover-7, a copper rod-8, a high-voltage alternating current and direct current power supply-9, a temperature control box-10, a vibrating table-11, a power amplifier-12, a signal generator-13, a light supplement lamp-14, a high-speed camera-15 and a fixing device-16.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A device and a method for a simulation experiment of bubble generation in oil paper insulation of a transformer/a high-voltage reactor under multiple physical fields are used for researching the formation and accumulation characteristics of bubble generation in an oil-immersed electrical device under a complex stress environment. The device mainly comprises an experimental oil tank, a high-voltage source 9, an electrode 4 and a fixing device 3 thereof, a temperature control device 10, a vibration device 11, a high-speed microscopic camera 15, a bubble generation module and the like, as shown in figure 1. The experiment box body is a square container made of quartz glass, and 25 # transformer oil is filled in the experiment box body. The bottom of the box body is provided with a vibrating table 11 which can generate 5Hz-5kHz effective vibration under the control action of a signal generator 13 and a power amplifier 12, the box body is connected with the vibrating device through a metal table board, a fixing device 16 is arranged on the table board, the box body can be locked through a rotating screw, and thus rigid connection is realized between the vibrating device and the box body, and the vibration can be effectively propagated.
Fixing device and high voltage electrode 4 are installed to the box, and its material is polytetrafluoroethylene and brass respectively, and polytetrafluoroethylene has good insulating properties and mechanical properties, and fixed intraduct car has the screw thread, can be according to experiment needs manual regulation electrode spacing.
A hole is formed in the center of a top cover of the oil tank, a copper rod is screwed in, insulation paper after drying and degassing treatment is uniformly wound on the copper rod and is placed into the experimental oil tank, and the moisture content in the transformer oil is determined according to experimental needs. The transformer oil in a 10ml oil tank was extracted every 2 hours, the water content in the oil was measured by a moisture tester, and the average value was taken for three measurements. And if the fluctuation of the moisture content is lower than 5 mu L/L, the moisture balance among the oil papers is considered, and the moisture content in the insulation paper of the transformer winding is converted into the moisture content in the insulation paper of the transformer winding through an oil paper moisture balance curve according to the current moisture content in the oil. At the moment, the influence rule of the moisture on the generation of the oiled paper insulation bubbles can be researched.
The temperature control box 10 controls the heating rod to realize temperature control, and the thermocouple 6 can measure the oil temperature in real time. As the temperature of the insulating oil around the winding rises, bubbles are generated on the surface of the insulating paper, and the bubble generation process can be observed through the high-speed camera 15. The camera, the observation area and the light supplement lamp are arranged on the same straight line, and the illumination intensity and the camera position of the light supplement lamp are adjusted, so that the bubble image is clear enough. The shooting frequency of the high-speed microscope camera is 1000fps, and about 2s, namely 2000 frames of images are needed for each shooting of the bubble migration or breakdown process.
Before the experiment, the experiment oil tank is firstly fixed on the vibration platform and is locked by screws. The electrode position is then fixed. And adjusting the insulation height of the oiled paper according to an experimental plan to enable the oiled paper to be positioned in the middle of the high-voltage electrode. And (3) injecting insulating oil into the experimental cavity, then installing a temperature control device, adjusting parameters of the vibration device, and testing whether the vibration parameters are normal.
In the experiment process, firstly, the position of the high-speed camera 15 and the intensity of the light supplement lamp 14 are adjusted, so that a clear image is obtained; the temperature of the insulating oil is adjusted by using the temperature control box 10 and stabilized for a period of time; observing and adjusting the image captured by the high-speed microscopic camera to make the bubble image clear; adjusting a signal generator 12 and a power amplifier 13 to apply a vibration signal to the box body, and obtaining an actual vibration parameter by using a vibration meter; the required voltage is given by using the high-voltage source 9, parameters such as vibration parameters, water content, oil temperature and the like are changed, the voltage is continuously applied until bubbles are generated, the processes of generation and migration of the bubbles are recorded by using the high-speed microscopic camera 15, and the characteristics of the bubbles are analyzed by using a computer.
In conclusion, the experimental device can realize measurement of the bubble generation characteristics in the oil paper insulation in multiple physical fields. The device can simulate the bubble generation characteristics under the action of multi-physical field stress such as an electric field, a temperature field, a vibration field and the like, and particularly can simulate the generation and migration characteristics of bubbles at a stage with large equipment load fluctuation under an overload condition. The considered multi-physical field condition is close to the complex operation environment inside the actual oil-immersed electrical equipment. The device has flexible control and higher precision on the electric field, the temperature field and the vibration field; the formation of bubbles was observed. Therefore, the experimental device meets the requirement of measuring the bubble generation characteristics in the oilpaper insulation in multiple physical fields.
Claims (6)
1. The invention relates to a device and a method for generating and simulating bubbles in oil paper insulation of a transformer/high-voltage reactor in multiple physical fields. The electrodes can be manually adjusted in distance under the action of the fixing device. The temperature range of the insulating oil can be adjusted between 0 ℃ and 150 ℃ under the control of a temperature control box. The box body is fixedly connected with the vibrating device through a rigid device, and the vibration frequency range is 5Hz-5 kHz. The top cover is installed at the top of the experimental oil tank, a hole is formed in the middle of the top cover, a copper bar is screwed in the hole, and insulation paper is wrapped outside the copper bar and used for simulating a winding of a transformer/high-voltage reactor. The device comprehensively considers the effects of multiple physical fields such as an electric field, a temperature field, a flow field and the like so as to simulate the internal complex stress environment of the actual oil-immersed power equipment, and has the characteristic of semi-automation.
2. The device and the method for simulating the generation of the bubbles in the oil-paper insulation of the transformer/high-voltage reactor in the multiple physical fields according to claim 1 are characterized in that the electrodes are fixed by polytetrafluoroethylene sleeves, threads are engraved in the electrode fixing device, and the distance between the two pole plates can be manually adjusted according to requirements.
3. The device and the method for the simulation experiment of the generation of the bubbles in the paper-oil insulation of the transformer/the high-voltage reactor under the multiple physical fields according to claim 1 are characterized in that an electric heating rod and a thermocouple are arranged in an oil tank, and the temperature of the insulating oil can be adjusted to be within the range of 0-150 ℃ under the control of a temperature control box so as to simulate an overload high-temperature environment in the working stage of the oil-immersed electrical equipment under the fault condition.
4. The device and the method for simulating the generation of the bubbles in the oil paper insulation of the transformer/the high-voltage reactor in the multi-physical field according to claim 1 are characterized in that the dried and dehydrated insulation paper is wound on a copper rod screwed in the middle of a top cover, and the generation of the bubbles at the insulation interface of the oil paper is observed through a high-speed microscopic camera under the independent action and the coupling action of an electric field, a vibration field and a temperature field.
5. The device and the method for simulating the generation of the bubbles in the oil-paper insulation of the transformer/high-voltage reactor in the multi-physical field according to claim 1 are characterized in that the vibration platform is connected with the experiment box body and locked by two rigid clamping devices, so that the pressure applied to the box body can be uniform, and the box body is protected from being damaged.
6. A device and a method for simulating bubble generation in oil paper insulation of a transformer/high-voltage reactor in multiple physical fields are characterized in that the device for simulating bubble generation in oil paper insulation of a transformer/high-voltage reactor in multiple physical fields is used for carrying out experiments, the position of a high-speed camera and the intensity of a light supplement lamp are adjusted firstly, so that clear images are obtained; adjusting the temperature of the insulating oil by using a temperature control box; winding the dehydrated and dried insulating paper on a copper bar; setting required voltage by using a high-voltage source, and adjusting a signal generator and a power amplifier to apply required vibration to the box body, thereby realizing the coupling of an electric field, a vibration field and a temperature field; changing parameters such as vibration parameters, water content of insulating oil, oil temperature and the like, continuously increasing the applied voltage until bubbles are generated, and observing the generation and migration processes of the bubbles by using a high-speed microscope camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210274671.1A CN114660423A (en) | 2022-03-21 | 2022-03-21 | Device and method for simulation experiment of generation of oiled paper insulation bubbles in multiple physical fields |
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| CN202210274671.1A CN114660423A (en) | 2022-03-21 | 2022-03-21 | Device and method for simulation experiment of generation of oiled paper insulation bubbles in multiple physical fields |
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| CN114660423A true CN114660423A (en) | 2022-06-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116143066A (en) * | 2022-12-30 | 2023-05-23 | 西南大学 | Preparation method of microfluidic chip for microscopically simulating oilpaper insulation bubble effect |
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2022
- 2022-03-21 CN CN202210274671.1A patent/CN114660423A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116143066A (en) * | 2022-12-30 | 2023-05-23 | 西南大学 | Preparation method of microfluidic chip for microscopically simulating oilpaper insulation bubble effect |
| CN116143066B (en) * | 2022-12-30 | 2023-08-08 | 西南大学 | Preparation method of microfluidic chip for microscopically simulating oilpaper insulation bubble effect |
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