Insulating sleeve sealing detection device for gas insulated switchgear

Abstract

The invention belongs to the technical field of insulation sleeve sealing detection, and particularly relates to an insulation sleeve sealing detection device for an inflation cabinet, which comprises a support frame, a test board, an inflation type density measurement mechanism and a discharge type pressure measurement mechanism, the test board is arranged on the upper wall of the support frame, the inflation type density measurement mechanism is arranged on the upper wall of the test board, and the discharge type pressure measurement mechanism is arranged on the upper wall of the test board. The discharge type pressure measuring mechanism is arranged on the outer side of the inflation type density measuring mechanism, and the inflation type density measuring mechanism comprises a sliding adjustment assembly and a clamping assembly. The invention provides the insulation sleeve sealing detection device for the gas insulated switchgear, which can test tiny leakage on the surface of the insulation sleeve by utilizing a point discharge mode under the action of shortening the distance between a conductor and a point.

Description

Technical Field

[0001] The present invention belongs to the technical field of insulating bushing sealing detection, and specifically refers to an insulating bushing sealing detection device for gas-insulated switchgear (GIS). Background Art

[0002] When the conductor in the gas-insulated switchgear is energized, an electric field will be generated. If the conductor is directly exposed to the gas environment in the gas-insulated switchgear (such as SF6, N2, etc.), the electric field intensity on the surface of the conductor may be unevenly distributed, and electric field concentration is likely to occur at the tip, burr and other parts, resulting in partial discharge or even insulation breakdown. The tubular insulating bushing is sleeved outside the conductor, which can isolate the conductor from the surrounding gas medium, avoid direct contact between the conductor and the gas, and thus prevent electrical faults caused by electric field concentration.

[0003] At present, the existing insulating bushing sealing detection devices for gas-insulated switchgear have the following problems: When the existing insulating bushing sealing detection device for gas-insulated switchgear uses the positive pressure test method to test the sealing performance of the insulating bushing, the positive pressure test mainly relies on the pressure decay rate to judge leakage, and the sensitivity to the test of micro-leakage is insufficient, resulting in potential hidden dangers being missed, thereby reducing the test efficiency of the sealing performance of the insulating bushing. Therefore, it cannot meet the current use requirements of the insulating bushing sealing detection device for gas-insulated switchgear. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the existing technology, the present solution provides an insulating bushing sealing detection device for gas-insulated switchgear, which can use the way of tip discharge to test the micro-leakage existing on the surface of the insulating bushing under the action of shortening the distance between the conductor and the tip.

[0005] The technical solution adopted by the present solution is as follows: The insulating bushing sealing detection device for gas-insulated switchgear proposed by the present solution includes a support frame, a test bench, an inflation type density measurement mechanism and a discharge type pressure measurement mechanism. The test bench is arranged on the upper wall of the support frame, the inflation type density measurement mechanism is arranged on the upper wall of the test bench, the discharge type pressure measurement mechanism is arranged outside the inflation type density measurement mechanism. The inflation type density measurement mechanism includes a sliding adjustment component and a clamping component. The sliding adjustment component is arranged on the upper wall of the test bench, and the clamping component is arranged on the side wall of the sliding adjustment component. The discharge type pressure measurement mechanism includes a tip discharge component, an outer drum component and a pressure measurement component. The tip discharge component is arranged outside the sliding adjustment component, the outer drum component is arranged inside the sliding adjustment component, and the pressure measurement component is arranged at one end of the sliding adjustment component away from the tip discharge component.

[0006] As a further preference of the solution in this case, the sliding adjustment assembly includes a sliding frame, an inflation channel, an inflation valve and a pressure sensor. The sliding frame is symmetrically arranged on the upper walls at both ends of the test bench and is slidably connected to the test bench. The inflation channel is arranged on the inner wall of the sliding frame. The inflation valve is communicated and arranged on the upper wall at one end of the inflation channel. The pressure sensor is arranged on the inner wall of the inflation channel near one end of the inflation valve. The clamping assembly includes threaded holes, clamping bolts and clamping arc plates. The threaded holes are symmetrically arranged on both sides of the sliding frame. The clamping bolts are arranged inside the threaded holes and are threadedly connected to the threaded holes. The clamping arc plates are rotatably arranged on the sides of the clamping bolts close to the sliding frame and are arranged oppositely.

[0007] During use, the sliding frame slides away from each other along the upper wall of the test bench, and the distance between the inflation channels increases. Place the insulating sleeve to be detected between the inflation channels, push the sliding frame, and the sliding frame slides relatively along the upper wall of the test bench. The inflation channels are respectively inserted into the two ends of the insulating sleeve. Then rotate the clamping bolts. The clamping bolts rotate along the threaded holes to drive the clamping arc plates to approach the inflation channels. The clamping arc plates squeeze and fix the insulating sleeve sleeved outside the inflation channels. Open the inflation valve, and the operator fills air into the inflation channels through the inflation valve to conduct a quantitative inflation test on the insulating sleeve. The pressure sensor monitors the air pressure filled into the insulating sleeve in real time through the detection end, so as to detect whether there is a leakage phenomenon in the insulating sleeve.

[0008] Preferably, the sharp discharge assembly includes a discharge frame, discharge tips and an insulating cover. The discharge frame is arranged at one end of the sliding frame away from the inflation valve. Multiple groups of the discharge tips are arranged on the inner wall of the discharge frame. The insulating cover is arranged outside the discharge frame. The outer drum assembly includes a guide plate, air vents, guide tubes, a push plate, an insulating channel, a superelastic alloy strip, a mutual pressing plate, a soft magnetic strip and an electromagnetic column. The guide plate is slidably arranged on the inner wall of the inflation channel. Multiple groups of the air vents are arranged on the side wall of the guide plate. The guide tubes penetrate through the sliding frame and are arranged on the side wall of the guide plate. The guide tubes are slidably connected to the sliding frame. The push plate is arranged on the side of the guide tube away from the guide plate. The insulating channel is arranged on the inner wall of the guide tube. Multiple groups of the superelastic alloy strips are arranged on the side of the guide plate away from the guide tube. The mutual pressing plate is arranged on the side of the superelastic alloy strip away from the guide plate. The soft magnetic strip is arranged on the inner wall of the superelastic alloy strip. The electromagnetic column is arranged on the side wall of the mutual pressing plate inside the superelastic alloy strip. The soft magnetic strip and the electromagnetic column are arranged oppositely. The pressure measurement assembly includes a conductive copper strip, a pressure measurement seat, a pressure measurement electric meter and a pressure measurement cable. The conductive copper strip is arranged on the side of the superelastic alloy strip away from the soft magnetic strip. The pressure measurement seat is arranged on the side of the sliding frame close to the inflation channel. The pressure measurement electric meter is arranged on the side of the pressure measurement seat away from the sliding frame. The pressure measurement cable penetrates through the guide tube and is arranged between the pressure measurement end of the pressure measurement electric meter and the conductive copper strip.

[0009] In use, the quantitative inflation test mainly relies on the pressure decay rate to judge leakage, but it is not sensitive enough to detect tiny leaks. At this time, push the push plate. The push plate drives the guide plate to slide along the inner wall of the inflation channel through the guide tube. The guide plate drives the opposing plates to move relative to each other through the superelastic alloy strip. As the length of the guide tube extending into the inflation channel increases, the opposing plates fit together. When the electromagnetic column is energized, a magnetic field is generated between the electromagnetic column and the soft magnetic strip. The electromagnetic column and the soft magnetic strip are arranged with the same poles. After the opposing plates fit together, continue to push the guide tube. The guide tube squeezes the superelastic alloy strip, causing it to bend. Under the action of the magnetic field with the same poles between the electromagnetic column and the soft magnetic strip, the superelastic alloy strip bulges towards the inner wall of the insulating sleeve. The superelastic alloy strip drives the conductive copper strip closer to the discharge tip. The distance between the discharge tip and the conductive copper strip is greater than the distance between the discharge tips, and there is a relatively large potential difference between the discharge tip and the conductive copper strip. When there is a tiny hole in the insulating sleeve, the discharge tip can discharge through the tiny leakage hole and be connected to the conductive copper strip inside the insulating sleeve. The pressure measuring meter monitors the charged condition inside the conductive copper strip in real time through the pressure measuring cable. When the pressure measurement data of the pressure measuring meter changes, it means that the discharge of the discharge tip is conducted into the conductive copper strip, indicating that there is a leakage phenomenon in the insulating sleeve.

[0010] Specifically, a controller is provided on the side wall of the support frame.

[0011] Among them, the controller is electrically connected to the electromagnetic column and the pressure sensor respectively.

[0012] The beneficial effects achieved by this solution with the above structure are as follows: Compared with the prior art, this solution combines the internal guide wall-attaching structure and the tip discharge structure. Through the provided inflation-type density measurement mechanism and discharge-type pressure measurement mechanism, with the coordinated use of the sliding adjustment component, the clamping component, the tip discharge component, the outer drum component, and the pressure measurement component, it can detect tiny leaks in the insulating sleeve. Utilizing the deformation of the superelastic alloy strip, under the continuous pushing and squeezing of the guide tube, the superelastic alloy strip can bulge and drive the conductive copper strip closer to the discharge tip, shortening the connection distance, making it easier to generate a connection phenomenon between the discharge tip and the conductive copper strip. Furthermore, it can detect the tiny leakage part of the insulating sleeve, thereby overcoming the insufficient sensitivity of the quantitative inflation test and improving the test efficiency of the sealing performance of the insulating sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the overall structural schematic diagram of this solution; Figure 2 is the front perspective view of this solution; Figure 3 is the internal structural schematic diagram of this solution; Figure 4 is the structural schematic diagram of the outer drum component of this solution; Figure 5 is the front view of this solution; Figure 6 is the side view of this solution; Figure 7 is the top view of this solution; Figure 8 is Figure 7 the sectional view taken along line A - A of Figure 9 is Figure 5 the sectional view taken along line B - B of Figure 10 is Figure 8 the enlarged structural view of part I of Figure 11 is Figure 2 the enlarged structural view of part II of Figure 12 is Figure 9 the enlarged structural view of part III of

[0014] Among them, 1. support frame, 2. test bench, 3. inflatable density measuring mechanism, 4. sliding adjustment component, 5. sliding frame, 6. inflation channel, 7. inflation valve, 8. clamping component, 9. threaded hole, 10. clamping bolt, 11. clamping arc plate, 12. discharge type pressure measuring mechanism, 13. sharp discharge component, 14. discharge frame, 15. discharge tip, 16. insulating cover, 17. outer drum component, 18. guide plate, 19. ventilation port, 20. guide tube, 21. push plate, 22. insulating channel, 23. superelastic alloy strip, 24. mutual abutment plate, 25. soft magnetic strip, 26. electromagnetic column, 27. pressure measuring component, 28. conductive copper strip, 29. pressure measuring seat, 30. pressure measuring electric meter, 31. pressure measuring cable, 32. controller, 33. pressure sensor.

[0015] The attached drawings are used to provide further understanding of this solution, and constitute a part of the specification. Together with the embodiments of this solution, they are used to explain this solution, and do not constitute a limitation to this solution. Specific Embodiments

[0016] Next, the technical solutions in the embodiments of this solution will be clearly and completely described in conjunction with the attached drawings in the embodiments of this solution. Obviously, the described embodiments are only a part of the embodiments of this solution, rather than all the embodiments; based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this solution.

[0017] In the description of this solution, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this solution and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this solution.

[0018] As Figures 1-12 shown, the insulation sleeve sealing detection device for the gas-insulated switchgear proposed in this solution includes a support frame 1, a test bench 2, an inflation type density measurement mechanism 3, and a discharge type pressure measurement mechanism 12. The test bench 2 is arranged on the upper wall of the support frame 1. The inflation type density measurement mechanism 3 is arranged on the upper wall of the test bench 2. The discharge type pressure measurement mechanism 12 is arranged outside the inflation type density measurement mechanism 3. The inflation type density measurement mechanism 3 includes a sliding adjustment component 4 and a clamping component 8. The sliding adjustment component 4 is arranged on the upper wall of the test bench 2. The clamping component 8 is arranged on the side wall of the sliding adjustment component 4. The discharge type pressure measurement mechanism 12 includes a sharp discharge component 13, an outer drum component 17, and a pressure measurement component 27. The sharp discharge component 13 is arranged outside the sliding adjustment component 4. The outer drum component 17 is arranged inside the sliding adjustment component 4. The pressure measurement component 27 is arranged at one end of the sliding adjustment component 4 away from the sharp discharge component 13.

[0019] The sliding adjustment component 4 includes a sliding frame 5, an inflation channel 6, an inflation valve 7, and a pressure sensor 33. The sliding frames 5 are symmetrically arranged on the upper walls at both ends of the test bench 2. The sliding frame 5 is slidably connected to the test bench 2. The inflation channel 6 is arranged on the inner wall of the sliding frame 5. The inflation valve 7 is communicatively arranged on the upper wall at one end of the inflation channel 6. The pressure sensor 33 is arranged on the inner wall of the inflation channel 6 near the inflation valve 7. The clamping component 8 includes a threaded hole 9, a clamping bolt 10, and a clamping arc plate 11. The threaded holes 9 are symmetrically arranged on both sides of the sliding frame 5. The clamping bolt 10 is arranged inside the threaded hole 9. The clamping bolt 10 is threadedly connected to the threaded hole 9. The clamping arc plate 11 is rotatably arranged on the side of the clamping bolt 10 close to the sliding frame 5. The clamping arc plates 11 are arranged oppositely.

[0020] The pointed discharge assembly 13 includes a discharge rack 14, discharge tips 15 and an insulating cover 16. The discharge rack 14 is arranged at one end of the sliding rack 5 away from the inflation valve 7. A plurality of groups of the discharge tips 15 are arranged on the inner wall of the discharge rack 14. The insulating cover 16 is arranged outside the discharge rack 14. The outer drum assembly 17 includes a guide plate 18, air vents 19, guide tubes 20, push plates 21, insulating channels 22, superelastic alloy strips 23, abutting plates 24, soft magnetic strips 25 and electromagnetic columns 26. The guide plate 18 is slidably arranged on the inner wall of the inflation channel 6. A plurality of groups of the air vents 19 are arranged on the side wall of the guide plate 18. The guide tubes 20 penetrate through the sliding rack 5 and are arranged on the side wall of the guide plate 18. The guide tubes 20 are slidably connected to the sliding rack 5. The push plate 21 is arranged on the side of the guide tube 20 away from the guide plate 18. The insulating channel 22 is arranged on the inner wall of the guide tube 20. A plurality of groups of the superelastic alloy strips 23 are arranged on the side of the guide plate 18 away from the guide tube 20. The abutting plate 24 is arranged on the side of the superelastic alloy strip 23 away from the guide plate 18. The soft magnetic strip 25 is arranged on the inner wall of the superelastic alloy strip 23. The electromagnetic column 26 is arranged on the side wall of the abutting plate 24 inside the superelastic alloy strip 23. The soft magnetic strip 25 and the electromagnetic column 26 are arranged opposite to each other. The pressure measuring assembly 27 includes a conductive copper strip 28, a pressure measuring seat 29, a pressure measuring electric meter 30 and a pressure measuring cable 31. The conductive copper strip 28 is arranged on the side of the superelastic alloy strip 23 away from the soft magnetic strip 25. The pressure measuring seat 29 is arranged on the side of the sliding rack 5 close to the inflation channel 6. The pressure measuring electric meter 30 is arranged on the side of the pressure measuring seat 29 away from the sliding rack 5. The pressure measuring cable 31 penetrates through the guide tube 20 and is arranged between the pressure measuring end of the pressure measuring electric meter 30 and the conductive copper strip 28.

[0021] A controller 32 is arranged on the side wall of the support frame 1.

[0022] The controller 32 is electrically connected to the electromagnetic column 26 and the pressure sensor 33 respectively.

[0023] During specific use, manually pull the sliding rack 5. The sliding rack 5 slides away from each other along the upper wall of the test bench 2, and the distance between the inflation channels 6 increases. Place the insulating sleeve to be detected between the inflation channels 6. Manually push the sliding rack 5. The sliding rack 5 slides relatively along the upper wall of the test bench 2, and the inflation channels 6 are respectively inserted into the two ends of the insulating sleeve. The insulating covers 16 are mutually attached. Then rotate the clamping bolt 10. The clamping bolt 10 rotates along the threaded hole 9 and drives the clamping arc plate 11 to approach the inflation channel 6. The clamping arc plate 11 squeezes and fixes the insulating sleeve sleeved outside the inflation channel 6. Open the inflation valve 7, and the operator fills the inside of the inflation channel 6 with air through the inflation valve 7 to conduct a quantitative inflation test on the insulating sleeve. The controller 32 controls the pressure sensor 33 to start. The pressure sensor 33 monitors the air pressure filled into the insulating sleeve in real time through the detection end, so as to detect whether there is a leakage phenomenon in the insulating sleeve. The quantitative inflation test mainly relies on the pressure decay rate to judge leakage, but the sensitivity to micro-leakage is insufficient. At this time, push the push plate 21. In the initial state, the mutual contact plate 24 is placed beside the inflation channel 6. The push plate 21 drives the guide plate 18 to slide along the inner wall of the inflation channel 6 through the guide tube 20. The guide plate 18 drives the mutual contact plate 24 to move relatively through the superelastic alloy strip 23. As the length of the guide tube 20 extending into the inflation channel 6 increases, the mutual contact plates 24 fit together; The controller 32 controls the electromagnetic column 26 to start. A magnetic field is generated between the energized electromagnetic column 26 and the soft magnetic strip 25. The electromagnetic column 26 and the soft magnetic strip 25 are set with the same pole. After the mutual contact plates 24 fit together, continue to push the guide tube 20. The guide tube 20 squeezes the superelastic alloy strip 23 to cause it to bend. Under the action of the magnetic field with the same pole between the electromagnetic column 26 and the soft magnetic strip 25, the superelastic alloy strip 23 protrudes toward the inner wall side of the insulating sleeve. The superelastic alloy strip 23 drives the conductive copper strip 28 close to the discharge tip 15. The distance between the discharge tip 15 and the conductive copper strip 28 is greater than the distance between the discharge tips 15. Use an external energized device to energize the discharge tip 15. The voltages between the discharge tips 15 are the same, and the discharge probability between them is small; There is a large potential difference between the discharge tip 15 and the conductive copper strip 28. When there is a micro-hole in the insulating sleeve, the discharge of the discharge tip 15 can penetrate the micro-leakage hole and be electrically connected to the conductive copper strip 28 inside the insulating sleeve. The pressure measuring meter 30 monitors the charged condition inside the conductive copper strip 28 in real time through the pressure measuring cable 31. When the pressure measuring data of the pressure measuring meter 30 changes, the discharge of the discharge tip 15 is conducted into the conductive copper strip 28, indicating that there is a leakage phenomenon in the insulating sleeve; Repeat the above operation when using it next time.

[0024] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0025] The above describes the present solution and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present solution, and the actual structure is not limited thereto. In summary, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the creation of the present solution, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present solution.

Claims

1. Insulation bushing sealing detection device for gas-insulated switchgear, comprising a support frame and a test bench, characterized in that: It also includes an inflatable density measuring mechanism and a discharge type pressure measuring mechanism, wherein the test bench is arranged on the upper wall of the support frame, the inflatable density measuring mechanism is arranged on the upper wall of the test bench, and the discharge type pressure measuring mechanism is arranged outside the inflatable density measuring mechanism; The inflatable density measuring mechanism comprises a sliding adjustment component and a clamping component; The sliding adjustment component is arranged on the wall of the test bench, and the clamping component is arranged on the side wall of the sliding adjustment component; The discharge type pressure measuring mechanism comprises a tip discharge component, an outer drum component and a pressure measuring component; The tip-release assembly is arranged outside the slide assembly, the outer drum assembly is arranged inside the slide assembly, and the pressure measuring assembly is arranged at one end of the slide assembly away from the tip-release assembly; The sliding adjustment assembly includes a sliding frame and an air charging channel; The sliding frame is symmetrically arranged on the upper walls at both ends of the test bench, the sliding frame is slidably connected to the test bench, and the inflation channel is arranged on the inner wall of the sliding frame; The outer drum assembly includes a guide plate, a vent, a guide tube, a push plate, an insulating channel, a superelastic alloy strip, a mutual abutment plate, a soft magnetic strip and an electromagnetic column; The guide plate is slidably arranged on the inner wall of the inflation channel, multiple groups of the vents are arranged on the side wall of the guide plate, the guide tube passes through the sliding frame arranged on the side wall of the guide plate, the guide tube is slidably connected to the sliding frame, the push plate is arranged on the side of the guide tube away from the guide plate, the insulating channel is arranged on the inner wall of the guide tube, multiple groups of the superelastic alloy strips are arranged on the side of the guide plate away from the guide tube, the mutual abutment plate is arranged on the side of the superelastic alloy strip away from the guide plate, the soft magnetic strip is arranged on the inner wall of the superelastic alloy strip, the electromagnetic column is arranged on the side wall of the mutual abutment plate inside the superelastic alloy strip, and the soft magnetic strip and the electromagnetic column are arranged opposite to each other.

2. The insulating bushing sealing detection device for the gas-insulated switchgear according to claim 1, characterized in that: The sliding adjustment component also includes an inflation valve and a pressure sensor. The inflation valve is connected to an upper wall at one end of the inflation channel, and the pressure sensor is arranged on an inner wall at one end of the inflation channel close to the inflation valve.

3. The insulating bushing sealing detection device for an inflatable cabinet according to claim 1, characterized in that: The clamping assembly includes a threaded hole, a clamping bolt and a clamping arc plate. The threaded holes are symmetrically arranged on both sides of the sliding frame. The clamping bolt is arranged inside the threaded hole. The clamping bolt is threadedly connected to the threaded hole. The clamping arc plate is rotatably arranged on one side of the clamping bolt close to the sliding frame, and the clamping arc plates are relatively arranged.

4. The insulating bushing sealing detection device for the gas-insulated switchgear according to claim 2, characterized in that: The tip discharge assembly comprises a discharge frame, a discharge tip and an insulating cover. The discharge frame is arranged at one end of the sliding frame away from the inflation valve. Multiple groups of the discharge tips are arranged on the inner wall of the discharge frame. The insulating cover is arranged on the outer side of the discharge frame.

5. The insulating bushing sealing detection device for the gas-insulated switchgear according to claim 1, wherein: The pressure measuring assembly includes a conductive copper bar, a pressure measuring seat, a pressure measuring meter and a pressure measuring cable. The conductive copper bar is arranged on the side of the superelastic alloy bar away from the soft magnetic bar, the pressure measuring seat is arranged on the side of the sliding frame close to the inflation channel, the pressure measuring meter is arranged on the side of the pressure measuring seat away from the sliding frame, and the pressure measuring cable passes through the guide tube and is arranged between the pressure measuring end of the pressure measuring meter and the conductive copper bar.

6. The insulating bushing sealing detection device for a gas-insulated switchgear according to claim 1, characterized in that: A controller is arranged on the side wall of the support frame.

7. The insulating bushing sealing detection device for the gas-insulated switchgear according to claim 6, wherein: The controller is electrically connected to the electromagnetic column and the pressure sensor respectively.

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