An insulating oil dielectric strength tester

Abstract

The application provides an insulating oil dielectric strength tester, and relates to the technical field of electrical performance testing.The insulating oil dielectric strength tester comprises a control box, a measuring bin, a detection assembly and a calibration assembly, the top of the control box is provided with the measuring bin, the top end edge of the measuring bin is hinged with a cover plate, the inside of the measuring bin is provided with the detection assembly, the front end of the detection assembly is provided with a driving mechanism, the top end of the detection assembly is connected with the calibration assembly, and the bottom side of the detection assembly is provided with a connecting channel.The application can realize the detection process of the dielectric strength of the insulating oil at different height positions, can accurately simulate the use of the insulating oil under the influence of different impurity states during normal use, can obtain more effective measurement result data, and can also close the inside of the detection assembly during the rotation process of the electrode column, so that the inside of the detection assembly can be cleaned.

Description

Technical Field

[0001] This invention relates to the field of electrical performance testing technology, specifically to an insulating oil dielectric strength tester. Background Technology

[0002] Dielectric strength testing of insulating oil is primarily used to assess its insulation performance in electrical equipment. By testing its withstand voltage and breakdown characteristics, it ensures safe equipment operation. This test quantifies the aging degree of the insulating oil, promptly detecting oil deterioration or contamination, and preventing equipment failures due to insulation failure. Regular testing can prevent equipment failures and accidents caused by oil deterioration, such as insulation failure in oil-filled equipment like transformers and circuit breakers. Changes in dielectric strength reflect the degree to which the oil is affected by factors such as high temperature and oxidation, providing a basis for maintenance and replacement.

[0003] Existing technologies use dielectric strength testers to measure the dielectric strength of insulating oil. However, impurities in the insulating oil can cause fluctuations in the dielectric strength data. The presence of air bubbles can significantly reduce the breakdown voltage, directly affecting the reliability of the final dielectric strength result. Conventional testers can only stabilize the final result by removing impurities, but insulating oil is inevitably mixed with impurities during normal operation. Therefore, simple filtration cannot accurately simulate the effects of different impurity states during normal operation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide an insulating oil dielectric strength tester to solve the problems mentioned in the background. The present invention features a semi-circular structure inside the detection cavity. An outer driving mechanism rotates two inner electrode posts, enabling the detection of the insulating oil dielectric strength at different heights. This allows for accurate simulation of the insulating oil's performance under different impurity conditions during normal use, resulting in more effective measurement data. The rotation of the electrode posts also seals the interior of the detection component, facilitating cleaning and flushing.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an insulating oil dielectric strength tester, comprising a tester body, the tester body including a control box, a test chamber, a detection component, and a calibration component. The control box has a test chamber at its top, and a cover plate is hinged to the top edge of the test chamber. The test chamber contains a detection component, a drive mechanism is mounted at the front end of the detection component, and a calibration component is connected to the top of the detection component. A connection channel is provided on one side of the bottom of the detection component, and a first discharge pipe is connected to the end of the connection channel. A solenoid valve is installed inside the first discharge pipe. A rotating arm is integrally formed on the side of the drive mechanism, and an electrode post is provided at the end of the rotating arm. The electrode post includes a first electrode post and a second electrode post. A vacuum pump is screwed to the top of the control box, and an air extraction pipe is connected to one end of the vacuum pump. An air extraction channel is provided at the end of the air extraction pipe, and the end of the air extraction channel is connected to the surface of the detection component.

[0006] Furthermore, the detection component includes a first injection pipe, a detection cavity, and a partition. The first injection pipe is connected to one end of the detection cavity. The top of the detection cavity is integrally formed with a partition, and the surface of the partition is provided with a docking hole. The middle of the detection cavity is integrally formed with a central channel.

[0007] Furthermore, the docking hole is generally strip-shaped, and there are two docking holes. The interior of the detection cavity is connected to the interior of the connection channel at the bottom.

[0008] Furthermore, the top of the detection cavity is connected to the interior of the air extraction channel, and the internal cross-section of the detection cavity is semi-circular. The insulating oil to be tested is transported to the interior of the detection cavity through the first injection pipe, and the level of the injected insulating oil is lower than the connection between the first injection pipe and the detection cavity.

[0009] Furthermore, the drive mechanism includes a motor, a driven shaft, a scraper, and a rotating arm. The output end of the motor is connected to a drive shaft, and a first gear is keyed to the surface of the drive shaft. A second gear meshes with the side of the first gear.

[0010] Furthermore, the second gear key is connected to the surface of the driven shaft, the outer casing of the motor is screwed to the inner wall of the measuring chamber, the end of the drive shaft is embedded into the housing of the detection component through a bearing, one end of the driven shaft is connected to a conductive post, the rotating arm is integrally formed on the surface of the driven shaft, and an arc plate is provided on the side of the driven shaft.

[0011] Furthermore, the first electrode post and the second electrode post are respectively set on the top of different arc-shaped plates. Each arc-shaped plate is covered with a sealing strip. A scraper is set between the two rotating arms. The scraper has holes on its surface. The arc-shaped plate is used to pass through the inside of the docking hole. The sealing strip is used to seal the docking hole.

[0012] Furthermore, a groove is provided on one side of the bottom of the detection cavity, and the interior of the detection cavity is connected to the interior of the groove. The conductive post is partially electrically connected to the first electrode post and the second electrode post.

[0013] Furthermore, the calibration assembly includes a calibration cavity, a second injection pipe, and a second discharge pipe. The calibration cavity is attached to the surface of the central channel, the top of the calibration cavity has a second injection pipe, and the side of the calibration cavity is connected to a second discharge pipe.

[0014] Furthermore, the side of the calibration cavity is fitted with the partition plate, and a notch is provided on the side of the calibration cavity. The notch is connected to the docking hole. The arc-shaped plate passes through the docking hole and the notch in sequence, and the first electrode post and the second electrode post enter the interior of the calibration cavity after passing through the notch.

[0015] The beneficial effects of this invention are:

[0016] The insulating oil dielectric strength tester has a semi-circular structure inside the detection cavity. The two inner electrode posts are driven by the outer drive mechanism to rotate, thereby realizing the detection process of insulating oil dielectric strength at different height positions. This allows for accurate simulation of the use of insulating oil under the influence of different impurities during normal use, and obtains more effective test results.

[0017] This insulating oil dielectric strength tester controls the drive mechanism to move slowly to avoid the scraper plate affecting the stratification of internal impurities. At the same time, during the testing process at different height positions, the drive mechanism also moves rapidly back and forth, working in conjunction with the scraper plate and the holes on the surface to quickly stir the entire oil sample, thereby directly obtaining the dielectric strength data of the insulating oil after the impurities have been homogenized.

[0018] The insulating oil dielectric strength tester has a calibration component connected to the top of the testing component. After the electrode column is tested and rinsed, it can be directly rotated to be embedded into the calibration component for calibration. The electrode column is never exposed to the outside, reducing the probability of interference from external impurities. The rotation of the electrode column can also seal the inside of the testing component, which can achieve the purpose of rinsing and cleaning the inside of the testing component. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external structure of an insulating oil dielectric strength tester according to the present invention;

[0020] Figure 2 This is a structural diagram of the internal structure of the chamber used in this invention.

[0021] Figure 3 This is a schematic diagram of the drive mechanism of the present invention;

[0022] Figure 4 for Figure 3 Enlarged view of region A in the middle;

[0023] Figure 5 This is a split view of the detection component of the present invention;

[0024] Figure 6 This is a cross-sectional view of the calibration component of the present invention;

[0025] Figure 7 This is a connection diagram of the vacuum pump part of the present invention;

[0026] In the diagram: 1. Control box; 2. Measurement chamber; 3. Cover plate; 4. Detection assembly; 5. Calibration assembly; 6. Drive mechanism; 7. First injection pipe; 8. First discharge pipe; 9. Evacuation channel; 10. Motor; 11. Drive shaft; 12. First gear; 13. Second gear; 14. Conductive post; 15. Driven shaft; 16. Scraper; 17. Hole; 18. Rotating arm; 19. Arc plate; 20. First electrode post; 21. Sealing strip; 22. Second electrode post; 23. Detection cavity; 24. Central channel; 25. Connecting channel; 26. Groove; 27. Partition; 28. Docking hole; 29. ​​Calibration cavity; 30. Notch; 31. Second injection pipe; 32. Second discharge pipe; 33. Vacuum pump; 34. Evacuation pipe. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0028] Please see Figures 1 to 7The present invention provides the following technical solution: an insulating oil dielectric strength tester, comprising a tester body, the tester body comprising a control box 1, a test chamber 2, a detection component 4, and a calibration component 5, the control box 1 having a test chamber 2 at its top, a cover plate 3 hinged to the top edge of the test chamber 2, the test chamber 2 having a detection component 4 inside, a drive mechanism 6 mounted at the front end of the detection component 4, the calibration component 5 connected to the top end of the detection component 4, a connection channel 25 on one side of the bottom of the detection component 4, a first discharge pipe 8 connected to the end of the connection channel 25, a solenoid valve installed inside the first discharge pipe 8, a rotating arm 18 integrally formed on the side of the drive mechanism 6, an electrode post at the end of the rotating arm 18, the electrode post comprising a first electrode post 20 and a second electrode post 22, a vacuum pump 33 screwed to the top of the control box 1, one end of the vacuum pump 33 connected to a suction pipe 34, a suction channel 9 at the end of the suction pipe 34, and the end of the suction channel 9 connected to the surface of the detection component 4. This dielectric strength tester is used to measure the dielectric strength data of insulating oil samples.

[0029] When using this invention, after collecting the insulating oil sample to be tested, the insulating oil sample is injected into the detection component 4 by opening the top cover plate 3. Then, the control box 1 at the bottom can be turned on to energize the first electrode post 20 and the second electrode post 22. By applying a power frequency AC voltage between the two electrodes, the voltage is increased at a constant rate until the oil sample undergoes electrical breakdown. During breakdown, the electric field strength exceeds the insulation limit of the oil, causing electron ionization to form a conductive channel and a sudden voltage drop. The voltage value recorded by the controller at this time is the breakdown voltage. The dielectric strength is calculated by the ratio of the breakdown voltage to the electrode spacing. After completing a single measurement, the electrode column is slowly moved down by the drive mechanism 6 to repeatedly measure the dielectric strength data of the insulating oil sample at different depths. After all measurements are completed, the drive mechanism 6 is controlled to reciprocate again to stir the internal insulating oil sample. Then, the electrode column is controlled to move to the middle position to measure the last data, thus completing all the measurement operations. Then, the solenoid valve inside the bottom first discharge pipe 8 is opened to discharge the internally tested insulating oil sample and rinse it with pure water. During the rinsing process, the inner electrode column can also be cleaned. After cleaning, the arc plate 19 is moved to the top and embedded into the docking hole 28 with the help of the sealing strip 21. The calibration component 5 is used to calibrate the electrode column.

[0030] In this embodiment, the detection component 4 includes a first injection pipe 7, a detection cavity 23, and a partition 27. The first injection pipe 7 is connected to one end of the detection cavity 23. The top of the detection cavity 23 is integrally formed with the partition 27, and the surface of the partition 27 has a mating hole 28. The middle of the detection cavity 23 is integrally formed with a central channel 24. The mating hole 28 is generally strip-shaped, and there are two mating holes 28. The interior of the detection cavity 23 is connected to the interior of the bottom connecting channel 25. The top of the detection cavity 23 is connected to the interior of the air extraction channel 9, and the internal cross-section of the detection cavity 23 is semi-circular. The insulating oil to be tested is transported into the interior of the detection cavity 23 through the first injection pipe 7, and the level of the injected insulating oil is lower than the connection between the first injection pipe 7 and the detection cavity 23. Inside the detection cavity 23, there is a semi-circular structure. The two inner electrode posts are rotated by the outer drive mechanism 6, so as to realize the detection process of dielectric strength of insulating oil at different height positions. In this way, the usage of insulating oil under the influence of different impurities during normal use can be accurately simulated, and more effective measurement results data can be obtained.

[0031] Specifically, before testing, the sealing strip 1 is secured inside the docking hole 28, and the external vacuum pump 33 is activated to evacuate the insulating oil sample inside the testing cavity 23, eliminating air bubbles trapped within the sample. The semi-circular testing cavity 23 in the testing assembly 4 stores the insulating oil sample. During injection, the insulating oil sample is transported into the testing cavity 23 through the first injection pipe 7 at the end until it is submerged to the bottom of the connection between the first injection pipe 7 and the testing cavity 23. Subsequent testing can then proceed. After the measurement is completed, the solenoid valve inside the first discharge pipe 8 at the bottom is opened, allowing the tested insulating oil sample to pass through the bottom connecting channel 25 and into the first discharge pipe 8, ultimately being discharged to the outside.

[0032] In this embodiment, the drive mechanism 6 includes a motor 10, a driven shaft 15, a scraper plate 16, and a rotating arm 18. The output end of the motor 10 is connected to a drive shaft 11. A first gear 12 is keyed to the surface of the drive shaft 11, and a second gear 13 meshes with the side of the first gear 12. The second gear 13 is keyed to the surface of the driven shaft 15. The outer casing of the motor 10 is screwed onto the inner wall of the measuring chamber 2. The end of the drive shaft 11 is embedded into the housing of the detection component 4 via a bearing. One end of the driven shaft 15 is connected to a conductive post 14. The rotating arm 18 is integrally formed on the surface of the driven shaft 15, and an arc-shaped plate 19 is provided on the side of the driven shaft 15. The first electrode post 20 and the second electrode post 22 are respectively disposed at the top of different arc-shaped plates 19. A sealing strip 21 is attached to the surface of each arc-shaped plate 19. A scraper plate 16 is disposed between the two rotating arms 18. The scraper plate 16 has holes 17 on its surface. The arc-shaped plate 19 is used to pass through the inside of the docking hole 28, and the sealing strip 21 is used to seal the docking hole 28. A groove 26 is provided on one side of the bottom of the detection cavity 23, and the inside of the detection cavity 23 is interconnected with the inside of the groove 26. The conductive post 14 is partially electrically connected to the first electrode post 20 and the second electrode post 22. By controlling the drive mechanism 6 to move slowly, the influence of the scraper plate 16 on the internal impurity stratification phenomenon is avoided. Simultaneously, during the detection process at different height positions, the drive mechanism 6 also moves rapidly back and forth, working in conjunction with the scraper plate 16 and the holes 17 on its surface to achieve rapid mixing of the entire oil sample, thereby directly obtaining the dielectric strength data of the insulating oil after impurity homogenization.

[0033] After the motor 10 is started, the drive shaft 11 is driven to rotate. The drive shaft 11 drives the driven shaft 15 to rotate through the first gear 12 meshing with the second gear 13. The driven shaft 15 drives the rotating arm 18 on the side to rotate, which in turn drives the two arc plates 19 to rotate inside the detection cavity 23. This changes the height of the first electrode post 20 and the second electrode post 22 at the top, placing them at different positions inside the detection cavity 23. This allows for the dielectric strength measurement of the insulating oil sample inside. The slow movement of the drive mechanism 6 is controlled to avoid violent agitation of the insulating oil sample inside. After the two electrode posts are moved to different heights, the final detection results under different impurity precipitation states are measured. After the measurement process is completed, the stirring speed of the scraper plate 16 by the drive mechanism 6 is increased to agitate the oil sample inside, making the impurities homogenized. This allows the dielectric strength data of the impurities under the average dispersion state to be obtained.

[0034] In this embodiment, the calibration component 5 includes a calibration cavity 29, a second injection pipe 31, and a second discharge pipe 32. The calibration cavity 29 is attached to the surface of the central channel 24. The second injection pipe 31 is located at the top of the calibration cavity 29, and the second discharge pipe 32 is connected to the side of the calibration cavity 29. The side of the calibration cavity 29 is partially fitted with the partition plate 27. A notch 30 is located on the side of the calibration cavity 29, and the notch 30 is partially connected to the docking hole 28. The arc-shaped plate 19 passes through the docking hole 28 and the notch 30 in sequence, and the first electrode post 20 and the second electrode post 22 enter the interior of the calibration cavity 29 after passing through the notch 30. A calibration component 5 is connected to the top of the detection component 4. After the electrode post is detected and rinsed, it can be directly rotated to be embedded into the calibration component 5 for calibration. The electrode post is never exposed to the outside, reducing the probability of interference from external impurities. The rotation process of the electrode post can also seal the inside of the detection component 4, and the purpose of rinsing and cleaning the inside of the detection component 4 can be achieved through this sealing process.

[0035] Specifically, after injecting a standard oil sample into the calibration cavity 29 and completing the detection and cleaning process of the detection component 4, the first electrode post 20 and the second electrode post 22 are moved upward by the drive mechanism 6 and pass through the docking hole 28 and the notch 30. The two electrode posts can then be inserted into the calibration cavity 29 to detect the injected standard oil sample. By comparing the final detection result with the standard value of the standard oil sample, it can be determined whether there is a large error in the current electrode post body and the control box 1 body.

[0036] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An insulating oil dielectric strength tester, comprising a tester body, characterized in that: The measuring instrument body includes a control box (1), a measuring chamber (2), a detection component (4), and a calibration component (5). The top of the control box (1) has a measuring chamber (2), and a cover plate (3) is hinged to the top edge of the measuring chamber (2). The measuring chamber (2) is equipped with a detection component (4). A drive mechanism (6) is installed at the front end of the detection component (4). The top of the detection component (4) is connected to the calibration component (5). A connection channel (25) is provided on one side of the bottom of the detection component (4). A first discharge pipe (8) is connected to the end of the connection channel (25). A solenoid valve is installed inside the first discharge pipe (8). A rotating arm (18) is integrally formed on the side of the drive mechanism (6). An electrode post is provided at the end of the rotating arm (18). The electrode post includes a first electrode post (20) and a second electrode post (22). A vacuum pump (33) is screwed to the top of the control box (1). One end of the device is connected to an air extraction pipe (34), and the end of the air extraction pipe (34) is provided with an air extraction channel (9). The end of the air extraction channel (9) is connected to the surface of the detection component (4). The detection component (4) includes a first injection pipe (7), a detection cavity (23), and a partition (27). The first injection pipe (7) is connected to one end of the detection cavity (23). The top of the detection cavity (23) is integrally formed with a partition (27). The surface of the partition (27) is provided with a docking hole (28). The middle of the detection cavity (23) is integrally formed with a central channel (24). The calibration component (5) includes a calibration cavity (29), a second injection pipe (31), and a second discharge pipe (32). The calibration cavity (29) is attached to the surface of the central channel (24). The top of the calibration cavity (29) is provided with a second injection pipe (31). The side of the calibration cavity (29) is connected with a second discharge pipe (32).

2. The insulating oil dielectric strength tester according to claim 1, characterized in that: The docking hole (28) is generally strip-shaped, and there are two docking holes (28). The interior of the detection cavity (23) is connected to the interior of the bottom connection channel (25).

3. The insulating oil dielectric strength tester according to claim 2, characterized in that: The top of the detection cavity (23) is connected to the interior of the air extraction channel (9), and the internal cross section of the detection cavity (23) is semi-circular. The insulating oil to be tested is transported to the interior of the detection cavity (23) through the first injection pipe (7), and the level of the injected insulating oil is lower than the connection between the first injection pipe (7) and the detection cavity (23).

4. The insulating oil dielectric strength tester according to claim 1, characterized in that: The drive mechanism (6) includes a motor (10), a driven shaft (15), a scraper (16) and a rotating arm (18). The output end of the motor (10) is connected to a drive shaft (11). A first gear (12) is keyed to the surface of the drive shaft (11). A second gear (13) meshes with the side of the first gear (12).

5. The insulating oil dielectric strength tester according to claim 4, characterized in that: The second gear (13) is keyed to the surface of the driven shaft (15). The outer shell of the motor (10) is screwed onto the inner wall of the measuring chamber (2). The end of the drive shaft (11) is embedded into the housing of the detection assembly (4) through a bearing. One end of the driven shaft (15) is connected to a conductive post (14). The rotating arm (18) is integrally formed on the surface of the driven shaft (15). An arc plate (19) is provided on the side of the driven shaft (15).

6. The insulating oil dielectric strength tester according to claim 5, characterized in that: The first electrode post (20) and the second electrode post (22) are respectively set on the top of different arc plates (19). Each arc plate (19) is covered with a sealing strip (21). A scraper (16) is provided between the two rotating arms (18). The scraper (16) has holes (17) on its surface. The arc plate (19) is used to pass through the inside of the docking hole (28). The sealing strip (21) is used to seal the docking hole (28).

7. The insulating oil dielectric strength tester according to claim 6, characterized in that: The detection cavity (23) has a groove (26) on one side of its bottom, and the interior of the detection cavity (23) is connected to the interior of the groove (26). The conductive post (14) is partially electrically connected to the first electrode post (20) and the second electrode post (22).

8. The insulating oil dielectric strength tester according to claim 7, characterized in that: The side of the calibration cavity (29) is in contact with the partition plate (27). A notch (30) is provided on the side of the calibration cavity (29). The notch (30) is connected to the docking hole (28). The arc plate (19) passes through the docking hole (28) and the notch (30) in sequence. The first electrode post (20) and the second electrode post (22) enter the interior of the calibration cavity (29) after passing through the notch (30).

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