CN212808487U - Experimental device for insulating multifactor aging of vegetable oil paper - Google Patents
Experimental device for insulating multifactor aging of vegetable oil paper Download PDFInfo
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- CN212808487U CN212808487U CN202021497003.8U CN202021497003U CN212808487U CN 212808487 U CN212808487 U CN 212808487U CN 202021497003 U CN202021497003 U CN 202021497003U CN 212808487 U CN212808487 U CN 212808487U
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Abstract
The plant oil paper insulating multifactor aging experimental device comprises a stainless steel box, a voltage control device, a light control device, a temperature control device, an oxygen and moisture injection device and the like. The stainless steel box is divided into four inner cavities, and heat insulation plates are paved on the four inner cavities; the quartz glass light-transmitting opening is formed in the inner wall of the center of the stainless steel box body, and the size of the baffle can be adjusted to shield the light-transmitting opening; the sealing cover is insulated and a passage of a high-voltage electrode, a three-way valve, a thermometer and a heating rod is reserved; the high-voltage electrode and the ground electrode are both made of brass, and an insulating paper sample is clamped between the electrodes by adopting a plate-plate electrode model; the heating rod extends into the lower part of the oil tank and is used for changing the temperature in the oil tank; the oxygen moisture injection device is used for changing the oxygen content and the water content of the test insulating oil. The experimental device realizes multi-factor combined aging of electricity, heat, oxygen, moisture and illumination, can effectively and accurately control each variable, can independently set the internal environment of the device as required, and can carry out effective real-time monitoring.
Description
Technical Field
The utility model relates to an ageing experimental apparatus of insulating multifactor of vegetable oil paper belongs to transformer oil paper insulation monitoring and fault diagnosis technical field.
Background
The transformer is an important component in the power system and plays a key role in converting voltage. The power transformer is internally provided with an oil-paper insulation composite system consisting of insulating oil and insulating paper, and the power transformer gradually uses vegetable insulating oil instead of mineral insulating oil due to the requirement on environmental protection. Vegetable oils are degradable, renewable, and have higher ignition and flash points, but are less stable to oxidation. The vegetable oil paper insulation is affected by environmental factors such as electricity, heat, oxygen, moisture, illumination and the like under the operation condition of the transformer and is aged gradually, the aging degree of the vegetable oil paper insulation directly affects the service life of the power transformer, and once the power transformer fails, the vegetable oil paper insulation can cause considerable damage to a power system. Therefore, the aging rule of vegetable oil paper insulation is explored in an experimental mode, and the method is further applied to a transformer in actual operation and has very important significance for safe and reliable operation of a power system.
At present, most of the existing experimental devices are used for researching the influence of a single factor on the oil paper insulation aging, and although researchers have proposed excessive factor transformer oil paper insulation aging experimental devices, the experimental devices only have three influence factors of electricity, heat and vibration at most. The aging speed of the vegetable oil paper insulation is influenced by various factors such as electricity, heat, oxygen, moisture, illumination and the like, and an experimental device capable of effectively controlling the five factors is needed in order to accurately master the aging mechanism of the vegetable oil paper insulation. However, the existing experimental device can not meet the requirement.
Disclosure of Invention
The utility model provides an ageing experimental apparatus of insulating multifactor of vegetable oil paper, this experimental apparatus have realized that electricity, heat, oxygen, moisture, illumination multifactor unite ageing, can effectively each variable of accurate control, have fine leakproofness, heat-proof quality. The internal environment of the device can be independently set according to the requirement, and effective real-time monitoring is carried out. The utility model discloses have stronger practicality, have important meaning to improving power transformer operational reliability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an ageing experimental apparatus of insulating multifactor of vegetable oil paper, comprises stainless steel case, printing opacity mouth, baffle, equalizer ring, high-voltage electrode, ground electrode, heating rod, thermometer, business turn over gas port, manometer and oxygen moisture injection device etc.. The stainless steel box is a shell of the oil tank and is connected with the ground, the box body is divided into four inner cavities, heat insulation plates are paved on the four inner cavities, and the center of the box body is square hollow; the light-transmitting opening is formed in the inner wall of the center of the stainless steel box body and is made of quartz glass; the baffle is an opaque metal plate, can adjust the size, is used for shielding the light transmission opening and changing the light transmission size; the sealing cover is made of insulating materials, and a wiring terminal, an air inlet and an air outlet, a thermometer and a heating rod are reserved on the sealing cover and are sealed; the grading ring uniformly distributes high voltage around the object to ensure that no potential difference exists between each annular part; the high-voltage electrode and the ground electrode are both made of brass, and an insulating paper sample is clamped between the electrodes by adopting a plate-plate electrode model; the heating rod extends into the lower part of the oil tank and is used for changing the temperature in the oil tank; a thermometer is connected with a thermocouple, and the temperature in the oil tank is monitored constantly; the air inlet and outlet are externally connected with a vacuum pump and used for extracting redundant air in the box and filling nitrogen; the pressure gauge extends into the oil tank through the outer wall of the oil tank to monitor the air pressure in the oil tank, so that whether the sealing condition of the oil tank is good or not can be monitored; the oxygen moisture injection device is used for changing the oxygen content and the water content of the test insulating oil.
The vegetable oil paper insulation multifactor aging experimental device is characterized in that an oil tank is made of stainless steel, a square inner wall is arranged at the center of the oil tank, the inner wall is connected with a diagonal line of the outer wall, the oil tank is divided into four inner cavities, a layer of heat insulation board is paved on each inner cavity, and four light transmission openings are formed in the inner wall.
According to the vegetable oil paper insulation multi-factor aging experimental device, the heat insulation plates are made of glass fibers and are uniformly laid on the surfaces of the inner cavities, so that the temperature in each cavity can be kept stable, and mutual influence cannot be caused. Meanwhile, the glass fiber has better insulating property.
The plant oil paper insulation multifactor aging experimental device is characterized in that a light transmission opening is formed by quartz glass, the quartz glass is high-temperature resistant and has a good light transmission effect, and a light source at the center of an oil tank can penetrate through the light transmission opening to enter the oil tank.
The vegetable oil paper insulation multifactor aging experimental device is characterized in that the baffle is a telescopic metal plate with changeable size, and the size of the four baffles can be changed to change the illumination intensity entering the four inner cavities.
The sealing cover is integrally made of high-temperature and high-pressure resistant insulating material polytetrafluoroethylene, is provided with a sealing ring and can be tightly buckled with the top of an oil tank, and a connecting terminal, an air inlet and outlet, a thermometer and a heating rod are reserved.
According to the plant oil paper insulation multifactor aging experimental device, a high-voltage electrode and a ground electrode are both made of brass, the high-voltage electrode is connected with an upper wiring terminal, the ground electrode is connected with a lower stainless steel oil tank, and a dried insulation paper sample is clamped between the two electrodes.
The vegetable oil paper insulation multifactor aging experimental device is characterized in that an oxygen and moisture injection device extracts moisture and oxygen with different contents from the outside and injects the moisture and the oxygen into a cavity through a valve on the side wall.
The utility model has the advantages that: the experimental device realizes multi-factor combined aging of electricity, heat, oxygen, moisture and illumination, can effectively and accurately control each variable, can independently set the internal environment of the device as required, and can carry out effective real-time monitoring.
Drawings
Fig. 1 is a schematic front view of the device of the present invention.
Fig. 2 is a schematic plan view of the fuel tank of the present invention.
Fig. 3 is a schematic view of the sealing cover of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The utility model provides an experimental apparatus that ageing of insulating multifactor of vegetable oil paper for research electricity, heat, oxygen, moisture, illumination are to the mechanism of influence that the vegetable oil paper is insulating ageing, and this experimental apparatus comprises stainless steel case, printing opacity mouth, baffle, equalizer ring, high voltage electrode, ground electrode, heating rod, thermometer, business turn over gas port, manometer and oxygen moisture injection device etc. as shown in figure 1 elevation and figure 2 top view. The stainless steel box is a shell of the oil tank and is connected with the ground, the box body is divided into four inner cavities, heat insulation plates are paved on the four inner cavities, and the center of the box body is square hollow; the light-transmitting opening is formed in the inner wall of the center of the stainless steel box body and is made of quartz glass; the baffle is an opaque metal plate, can adjust the size, is used for shielding the light transmission opening and changing the light transmission size; the sealing cover is made of insulating materials, and a wiring terminal, an air inlet and an air outlet, a thermometer and a heating rod are reserved on the sealing cover and are sealed, as shown in figure 3; the grading ring uniformly distributes high voltage around the object to ensure that no potential difference exists between each annular part; the high-voltage electrode and the ground electrode are both made of brass, and an insulating paper sample is clamped between the electrodes by adopting a plate-plate electrode model; the heating rod extends into the lower part of the oil tank and is used for changing the temperature in the oil tank; a thermometer is connected with a thermocouple, and the temperature in the oil tank is monitored constantly; the air inlet and outlet are externally connected with a vacuum pump and used for extracting redundant air in the box and filling nitrogen; the pressure gauge extends into the oil tank through the outer wall of the oil tank to monitor the air pressure in the oil tank, so that whether the sealing condition of the oil tank is good or not can be monitored; the oxygen moisture injection device is used for changing the oxygen content and the water content of the test insulating oil.
The inner wall outer wall of oil tank is made by the stainless steel, and the outer wall meets with the ground, and the oil tank bottom directly links to each other with ground electrode, makes whole stainless steel shell and ground electrode all be in the ground potential like this. The high voltage electrode and the ground electrode are both made of brass, and the high voltage electrode can move up and down through threads so as to press the insulating paper clamped between the two polar plates. The high voltage electrode is connected with the high voltage power supply of external difference through the equalizer ring, can set up 4 high voltage power supply of equidimension not and carry out ageing experiments simultaneously, and then research voltage is to the insulating ageing influence mechanism of vegetable oil paper.
The oil tank is cut apart into four inner chambers by corrosion resistant plate, and the heat insulating board is all laid to every inner chamber, and glass fiber is selected to the heat insulating board material, and glass fiber has fine insulating nature and heat resistance, can keep the intracavity temperature stable to can not influence the temperature in other intracavities. The sealing cover is made of polytetrafluoroethylene, and the sealing cover and the oil tank are fixed through a sealing ring, so that the sealing performance in the oil tank is ensured. And a wiring terminal, an air inlet and outlet, a thermometer and a heating rod are reserved on the sealing cover, and sealing is performed. The heating rod stretches into the oil tank through the route of reserving out and heats the oil tank inside, can set for the different temperature of 4 heating rods to temperature in the accurate control system of thermometer through the top reaches the condition that the temperature is as the influence factor.
The light-transmitting opening is formed in the inner wall of the oil tank, and quartz glass is selected for use as the material of the light-transmitting opening, so that the light-transmitting cover has good light transmittance and is resistant to high temperature and high pressure. A light source is applied in the gap in the center of the fuel tank and can penetrate through the quartz glass to enter the interior of the fuel tank. Set up the baffle on the printing opacity mouth, the baffle is the metal opaque baffle of portable deformation, changes the size of baffle and just can change the size of printing opacity mouth, sets up 4 not printing opacity mouths of equidimension, reaches the condition that illumination is as the influence factor.
In actual conditions, the content of dissolved oxygen in the oil and the content of micro water in the oil are extremely low, so the utility model discloses a mode of injecting oxygen and moisture changes the content of dissolved oxygen and micro water in the oil. The outer wall of the oil tank is provided with a valve, and an injection device is used for injecting oxygen and moisture with different contents into the oil, as shown in figure 1. In addition, before oxygen is injected, the oil tank needs to be subjected to vacuum treatment, the three-way valve penetrates through the sealing cover and is externally connected with a vacuum pump, air in the oil tank is extracted, and nitrogen is filled to maintain air pressure balance.
During the experiment, the dried insulating paper sample is fixed between a high-voltage electrode and a ground electrode, vegetable insulating oil is injected to reach a position above a valve on the outer wall of an oil tank, and a sealing cover is covered; switching on a vacuum pump, opening a valve of a three-way valve, extracting redundant air in an oil tank, and injecting nitrogen from the other port of the three-way valve after extraction is finished; extracting oxygen and moisture with different concentrations from the outside, and respectively injecting the oxygen and the moisture into 4 oil tank inner cavities from the oil tank outer wall valve; changing the sizes of the 4 baffles to the required illumination intensity, and switching on the light source; setting the temperature of the four heating rods, and controlling different temperatures in the 4 inner cavities; and (4) switching on a high-voltage power supply, setting 4 power supplies with different voltage sizes as required, and starting an aging experiment. After the aging is finished, relevant characteristic parameters can be extracted for result analysis.
In conclusion, the experimental device can simultaneously realize the experiment that the plant oil paper aging is influenced by multiple factors of electricity, heat, oxygen, moisture and illumination, and different environmental factors can be set according to the experimental requirements. The experimental parameters are flexibly adjusted, and the multi-factor free combination is suitable for researching the oil paper insulation aging mechanism in a more complex environment. The experimental platform can meet the requirements of a transformer vegetable oil paper insulation multifactor aging experiment.
Claims (8)
1. A plant oil paper insulation multifactor aging experimental device is characterized by comprising a stainless steel box, a light transmission opening, a baffle, a high-voltage bushing, a wiring terminal, a high-voltage electrode, a ground electrode, a heating rod, a thermometer, an air inlet and outlet, a pressure gauge, an oxygen and moisture injection device and the like;
the stainless steel box is a shell of the oil tank and is connected with the ground, the box body is divided into four inner cavities, heat insulation plates are paved on the four inner cavities, and the center of the box body is square hollow; the light-transmitting opening is formed in the inner wall of the center of the stainless steel box body and is made of quartz glass; the baffle is an opaque metal plate, can adjust the size, is used for shielding the light transmission opening and changing the light transmission size; the sealing cover is made of insulating materials, and a wiring terminal, an air inlet and an air outlet, a thermometer and a heating rod are reserved on the sealing cover and are sealed; the grading ring uniformly distributes high voltage around the object to ensure that no potential difference exists between each annular part; the high-voltage electrode and the ground electrode are both made of brass, and an insulating paper sample is clamped between the electrodes by adopting a plate-plate electrode model; the heating rod extends into the lower part of the oil tank and is used for changing the temperature in the oil tank; a thermometer is connected with a thermocouple, and the temperature in the oil tank is monitored constantly; the air inlet and outlet are externally connected with a vacuum pump and used for extracting redundant air in the box and filling nitrogen; the pressure gauge extends into the oil tank through the outer wall of the oil tank to monitor the air pressure in the oil tank, so that whether the sealing condition of the oil tank is good or not can be monitored; the oxygen moisture injection device is used for changing the oxygen content and the water content of the test insulating oil.
2. The experimental device for the multifactor aging in vegetable oil paper insulation of claim 1, wherein the oil tank is made of stainless steel, the center of the oil tank is provided with a square inner wall, the inner wall is connected with the diagonal line of the outer wall, the oil tank is divided into four inner cavities, the inner cavities are all paved with a layer of heat insulation board, and the inner wall is provided with four light transmission ports.
3. The experimental device for the multifactor aging in vegetable oil paper insulation according to claim 1, wherein the thermal insulation board is made of glass fiber and is uniformly laid on the surface of the inner cavity, so that the temperature in each cavity can be kept stable without mutual influence, and the glass fiber has the insulation property.
4. The experimental device for the multifactor aging in vegetable oil paper insulation of claim 1, wherein the light-transmitting opening is made of quartz glass, the quartz glass is high temperature resistant and has good light-transmitting effect, and a light source at the center of the oil tank can enter the inside of the oil tank through the light-transmitting opening.
5. The experimental device for the multifactor aging in vegetable oil paper insulation of claim 1, wherein the baffles are flexible metal plates with changeable sizes, and the sizes of the four baffles can be changed to change the illumination intensity entering the four inner cavities.
6. The experimental device for the multifactor aging test of vegetable oil paper insulation of claim 1, wherein the sealing cover is made of insulating material polytetrafluoroethylene resistant to high temperature and high pressure, is provided with a sealing ring, can be tightly buckled with the top of the oil tank, and leaves a passage for the connecting terminal, the air inlet and outlet, the thermometer and the heating rod.
7. The experimental device for the multifactor aging in vegetable oil paper insulation of claim 1, wherein the high voltage electrode is connected with an upper connecting terminal, the ground electrode is connected with a lower stainless steel oil tank, and a piece of dried insulation paper sample is clamped between the two electrodes.
8. The experimental device for the multifactor aging in vegetable oil paper insulation of claim 1, wherein the oxygen moisture injection device extracts moisture and oxygen with different contents from the outside and injects the moisture and oxygen into the cavity through the valve on the side wall.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021497003.8U CN212808487U (en) | 2020-07-27 | 2020-07-27 | Experimental device for insulating multifactor aging of vegetable oil paper |
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| CN202021497003.8U CN212808487U (en) | 2020-07-27 | 2020-07-27 | Experimental device for insulating multifactor aging of vegetable oil paper |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018795A (en) * | 2021-11-05 | 2022-02-08 | 国网四川省电力公司电力科学研究院 | SF6 density relay shockproof oil aging test box and test method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018795A (en) * | 2021-11-05 | 2022-02-08 | 国网四川省电力公司电力科学研究院 | SF6 density relay shockproof oil aging test box and test method |
| CN114018795B (en) * | 2021-11-05 | 2023-09-26 | 国网四川省电力公司电力科学研究院 | SF6 density relay vibration-proof oil aging test box and test method |
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