An ultrahigh voltage GIL unit detection device

Abstract

The application relates to an ultrahigh-voltage GIL unit detection device, belonging to the technical field of industrial ray nondestructive detection, comprising an industrial CT machine main body and a detection plate, the industrial CT machine main body is provided with a ray source and has CT scanning and DR scanning functions, further comprising a base and an open ring-shaped support arranged on the base, an open movable ring that moves along the circumference of the open ring-shaped support is arranged in the open ring-shaped support, the industrial CT machine main body is arranged on one end of the open movable ring, and the other end of the open movable ring is provided with a fixing base on the two sides, the detection plate is detachably arranged on any fixing base, and a driving unit for driving the open movable ring to rotate along the circumference is arranged on the open ring-shaped support. The application can realize CT scanning and DR scanning switching, complete high-precision defect detection on the basis of rapid screening, and improve the detection efficiency and accuracy.

Description

Technical Field

[0001] This invention relates to the field of industrial X-ray nondestructive testing technology, and in particular to an ultra-high voltage GIL unit testing device. Background Technology

[0002] In modern power systems, ultra-high voltage (UHV) transmission technology is the core means of achieving large-scale, long-distance power transmission, playing a vital role in ensuring national energy security and promoting coordinated regional economic development. Gas-Insulated Transmission Lines (GILs) have become core equipment in UHV transmission projects due to their significant advantages, such as large transmission capacity, low energy loss, small footprint, and minimal impact from the natural environment. They are widely used in inter-regional power transmission and power plant outgoing lines. GIL units employ a modular design, and their key components are prone to various defects during manufacturing, transportation, installation, and long-term operation: conductor connections are susceptible to cracks, loosening, and foreign object inclusions; insulators are prone to pores and impurities; and flanges and outer shell weld areas are prone to welding defects. Therefore, efficient and accurate defect detection of key components in GIL units is crucial.

[0003] Existing patent CN118483258A discloses an in-situ CT inspection device for GIL conductor connection mechanisms. This GIL-specific CT inspection device adopts a two-half assembly guide rail and toothed ring structure. During use, it suffers from difficulties in unifying the assembly benchmark, and sudden motion points easily arise at the joints, leading to imaging misalignment. The two-half assembly structure is cumbersome to disassemble and assemble, time-consuming and labor-intensive in the confined working space of a GIL site. The scanning obstacle avoidance effect is limited, only able to avoid flange bolt obstruction by adjusting the X-ray source / detector plate at a small angle of 0~15°, which easily causes image superposition interference and low accuracy in detecting defects in the flange area. This inspection device does not involve scanning mode switching functionality, and cannot simultaneously meet the dual requirements of rapid screening and high-precision detection. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide an ultra-high voltage GIL unit testing device to achieve dual-mode scanning switching, complete high-precision defect detection on the basis of rapid screening, and improve detection efficiency and accuracy; solve the problems of blurred imaging and missed defect detection caused by flange bolt obstruction in existing devices, and achieve accurate detection of the flange area; adapt to the narrow working space of ultra-high voltage GIL field, realize rapid disassembly and offline calibration, and reduce the difficulty of on-site operation.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: an ultra-high voltage GIL unit detection device, including an industrial CT machine body and a detection plate. The industrial CT machine body has a radiation source and is equipped with CT scanning and DR scanning functions. It also includes a base and an open ring bracket set on the base. An open ring bracket is provided with an open rotating ring that moves circumferentially within it. The industrial CT machine body is set on one end of the open rotating ring, and the other end of the open rotating ring is provided with fixed seats on both sides. The detection plate is detachably installed on any fixed seat. The open ring bracket is provided with a drive unit for driving the open rotating ring to rotate circumferentially.

[0006] When the X-ray source and the detector plate are located on the same side of the open dynamic ring, the main body of the industrial CT machine is used to perform CT or DR scanning on the GIL unit vertically.

[0007] When the X-ray source and the detector plate are located on opposite sides of the open dynamic ring, the main body of the industrial CT machine is used to perform CT or DR scans on the GIL unit at an oblique angle.

[0008] Furthermore, the open annular bracket has a first notch, and the open moving ring has a second notch. The width of the first notch is greater than the width of the second notch, and the width of the second notch is slightly greater than the flange outer diameter of the GIL unit.

[0009] Furthermore, the inner side of the open annular bracket has a groove extending circumferentially therein, and multiple sets of rolling components are arranged circumferentially within the groove. The multiple sets of rolling components form an open annular track, and the open moving ring can roll circumferentially along the open annular track. The open moving ring and the rolling components roll in cooperation.

[0010] Furthermore, the rolling assembly includes rolling elements located on both sides of the open rotating ring and arranged opposite to each other. Open annular guide rails are provided on both sides of the open rotating ring. The rolling element includes two rollers. The open annular guide rails are embedded between the two rollers on the same side and roll in cooperation with the rollers.

[0011] Furthermore, one end of the open ring can extend into or out of the first notch area, and when the open ring moves circumferentially along the open annular support, the open ring can close the first notch.

[0012] The X-ray source has a starting position and an ending position. The driving unit drives the open ring to rotate circumferentially so that the X-ray source can swing between the starting position and the ending position. The angle between the starting position and the ending position relative to the axis of the open ring support is 220-230 degrees.

[0013] Furthermore, the drive unit includes a drive motor and two gear shafts. The gear shafts are rotatably mounted on an open annular bracket and have gear portions extending into grooves. An open toothed ring is provided on one side of the open moving ring, and the outer side of the open toothed ring has external teeth that mesh with the gear portions. A driven wheel is also provided on the gear shaft, and a driving wheel is provided on the output shaft of the drive motor. The driving wheel and the driven wheel are connected by a synchronous belt or a transmission chain.

[0014] Furthermore, the open annular guide rail has a third notch, the open toothed ring has a fourth notch, and the widths of the second, third, and fourth notches are equal.

[0015] Furthermore, the industrial CT scanner has a connecting seat at the bottom of its main body, which is detachably and fixedly connected to the open rotating ring by bolts.

[0016] Furthermore, the fixed base is provided with an angle adjustment mechanism, and the detection plate is mounted on the angle adjustment mechanism. The angle adjustment mechanism is used to adjust the angle between the detection plate and the radiation emitted by the radiation source to ensure that the radiation emitted by the radiation source is perpendicular to the detection plate.

[0017] Furthermore, the fixed base is provided with an L-shaped connecting plate, which includes a horizontal part and a vertical part connected to the horizontal part. The horizontal part is connected to the fixed base, and an angle adjustment mechanism is provided on the horizontal part. The angle adjustment mechanism includes a semi-circular slide rail, a slide seat slidably disposed on the semi-circular slide rail, and a support plate disposed on the slide seat. The detection plate is mounted on the support plate, and the slide seat is provided with a locking bolt for locking the slide seat.

[0018] The beneficial effects of this application are as follows: 1. The main body of the industrial CT machine of this application integrates CT and DR dual-mode functions, and the detector plate is arranged on both sides to realize flexible switching between vertical / oblique GIL mode. Conventional CT scan on the same side can generate three-dimensional tomographic images to accurately detect minute defects in core components such as conductors and insulators; oblique flange CT scan or DR scan on the opposite side can quickly screen and finely inspect the flange area, taking into account the needs of different working conditions.

[0019] 2. This application achieves active obstacle avoidance by changing the propagation path of the X-ray source. The X-ray passes obliquely through the flange area and through the gap between the bolts, fundamentally avoiding the obstruction of the flange bolts. This solves the problem of image superposition interference caused by the small-angle fine-tuning obstacle avoidance of traditional devices. The rotation angle range of the open rotating ring is 220-230 degrees, with a large scanning angle, avoiding blind spots in the detection, significantly improving the imaging quality of the flange and welding area, and reducing the defect missed detection rate.

[0020] 3. The open-ended rotating ring and the open-ended annular support in this application are both integrated modular structures, which do not require on-site assembly. The width of the second notch is slightly larger than the outer diameter of the flange of the GIL unit. The notch size is adapted to the GIL flange specifications, and the GIL unit can be directly fitted / moved in, which simplifies the operation and reduces the error interference caused by auxiliary structures. The device can be calibrated offline in the laboratory. After calibration, it can be directly pushed into the working area without secondary calibration. Compared with traditional assembled devices, the on-site operation time is greatly shortened, which is suitable for the narrow working space of GIL sites.

[0021] 4. This application uses multiple sets of rollers that roll in conjunction with the open annular guide rail to precisely limit the rotation trajectory of the open moving ring. The paired rollers effectively constrain the movement of the open moving ring, and the bidirectional support ensures that the open moving ring moves smoothly and slides without falling off the annular track. The X-ray source can achieve a scanning angle of 220-230 degrees.

[0022] 5. The drive motor, in conjunction with the dual gear shaft transmission, provides stable power, effectively avoiding rotational deviation and uneven angular velocity, and the detection accuracy is minimally affected by the on-site environment and operational factors. Attached Figure Description

[0023] Figure 1 This is a first axial side view of the present invention.

[0024] Figure 2 This is a second axial side view of the present invention.

[0025] Figure 3 This is a schematic diagram of the open-ended moving ring in this invention.

[0026] Figure 4 This is a side view of the present invention.

[0027] Figure 5 This is a schematic diagram of the angle adjustment structure of the present invention.

[0028] Figure 6 This is a diagram showing the usage status of the present invention.

[0029] Illustration markings: 1. Base, 2. Open-ended annular bracket, 21. Roller, 22. Groove, 3. Detector plate, 4. Fixing seat, 41. L-shaped connecting plate, 5. Industrial CT machine body, 51. Connecting seat, 6. Open-ended moving ring, 61. Open-ended annular guide rail, 62. Open-ended gear ring, 7. Drive motor, 71. Driving wheel, 72. Synchronous belt, 73. Gear shaft, 74. Driven wheel, 8. Semi-annular slide rail, 81. Slide block, 82. Support plate, 9. GIL unit, 91. Flange. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Please see Figure 1-6 This invention provides an ultra-high voltage GIL unit detection device, including an industrial CT scanner body 5 and a detection plate 3. The industrial CT scanner body 5 has an X-ray source and is equipped with CT and DR scanning functions. It also includes a base 1 and an open-ring bracket 2 mounted on the base 1. The open-ring bracket 2 contains an open-ring rotating ring 6 that moves circumferentially within it. The industrial CT scanner body 5 is mounted on one end of the open-ring rotating ring 6, and the other end of the open-ring rotating ring 6 has fixed seats 4 on both sides. The detection plate 3 can be selectively mounted on any of the fixed seats 4 according to detection needs. The upper part is equipped with a drive unit for driving the open rotating ring 6 to rotate circumferentially; when the detector plate 3 is installed on one of the fixed bases 4, the X-ray source and the detector plate 3 are located on the same side of the open rotating ring 6; when the detector plate 3 is installed on the other fixed base 4, the X-ray source and the detector plate 3 are located on opposite sides of the open rotating ring 6; when the X-ray source and the detector plate 3 are located on the same side of the open rotating ring 6, the industrial CT machine body 5 is used to perform CT scans or DR scans on the GIL unit 9 vertically; when the X-ray source and the detector plate 3 are located on opposite sides of the open rotating ring 6, the industrial CT machine body 5 is used to perform CT scans or DR scans on the GIL unit 9 obliquely.

[0032] The open annular bracket 2 has a first notch, and the open rotating ring 6 has a second notch. The width of the first notch is greater than the width of the second notch, and the width of the second notch is slightly greater than the outer diameter of the flange 91 of the GIL unit 9, so as to facilitate fitting the GIL unit 9 or moving the GIL unit 9 into the open rotating ring 6. In actual use, the GIL unit 9 is usually suspended in the air. Generally, this device is placed near the GIL unit 9, and then the open rotating ring 6 is fitted over the outside of the GIL unit 9. The base 1 may be equipped with casters with locking mechanisms for easy movement and adjustment.

[0033] One end of the open-ended moving ring 6 can extend into or detach from the first notch area. When the open-ended moving ring 6 moves circumferentially along the open-ended annular support 2, it can close the first notch. The X-ray source has a starting position and an ending position. The driving unit drives the open-ended moving ring 6 to rotate circumferentially, so that the X-ray source can swing between the starting position and the ending position. The angle between the starting position and the ending position relative to the axis of the open-ended annular support 2 is 220-230 degrees, so that the X-ray source can achieve a scanning angle of 220-230 degrees. The large scanning angle avoids detection blind spots.

[0034] Specifically, the inner side of the open annular bracket 2 has a groove 22 extending circumferentially. Multiple rolling components are spaced circumferentially within the groove 22, forming an open annular track. The open moving ring 6 can roll circumferentially along the open annular track, and the open moving ring 6 rolls in cooperation with the rolling components. Each rolling component includes rolling elements located on both sides of the open moving ring 6 and arranged opposite to each other. Open annular guide rails 61 are respectively provided on both sides of the open moving ring 6. Each rolling element includes two rollers 21, and the open annular guide rail 61 is embedded between the two rollers 21 on the same side and rolls in cooperation with them.

[0035] The drive unit includes a drive motor 7 and two gear shafts 73. The gear shafts 73 are rotatably mounted on the open annular support 2 and have gear portions extending into the grooves 22. An open toothed ring 62 is provided on one side of the open moving ring 6, with external teeth on its outer side meshing with the gear portions. A driven wheel 74 is also provided on the gear shaft 73. A driving wheel 71 is provided on the output shaft of the drive motor 7. The driving wheel 71 and the driven wheel 74 are connected by a synchronous belt 72 or a transmission chain. When both the driven wheel 74 and the driving wheel 71 are gears, the synchronous belt 72 is a toothed synchronous belt. When the driving wheel 71 and the driven wheel 74 are connected by a transmission chain, both the driving wheel 71 and the driven wheel 74 are sprockets, and the transmission chain is a chain.

[0036] The industrial CT scanner body 5 has a connecting seat 51 at its bottom, which is detachably fixed to the open rotating ring 6 by bolts. The open annular guide rail 61 has a third notch, and the open gear ring 62 has a fourth notch. The widths of the second, third, and fourth notches are equal. The meshing surface between the gear shaft and the open gear ring 62 is provided with a hard wear-resistant layer to reduce friction loss, improve the wear resistance and service life of the transmission mechanism, ensure scanning accuracy after long-term rotation, and reduce maintenance frequency. The hard wear-resistant layer has a carburized and hardened structure.

[0037] This embodiment also includes a control unit, which includes a PLC controller. The drive motor 7 is a servo motor. The PLC controller is electrically connected to the servo motor, the industrial CT machine body 5, and the detection plate 3. When the open-ended moving ring 6 moves, it has a step-stop mode and a continuous scanning mode. When the open-ended moving ring 6 is in the step-stop mode, the PLC controller controls the servo motor to drive the open-ended moving ring 6 to rotate to a preset angle and then stop precisely. The detection plate 3 collects the projection data of that angle. After the collection is completed, it rotates to the next angle. After the collection is completed, it rotates to the next angle. After collecting data angle by angle, the industrial CT machine body reconstructs a three-dimensional tomographic image to complete high-precision defect detection.

[0038] When the open-ended rotating ring 6 is in continuous scanning mode, its movement speed is 3-5 times faster than in step-and-stop mode. The PLC controller controls the servo motor to drive the open-ended rotating ring 6 to rotate at a constant speed. The detection plate 3 continuously acquires projection data in real time, which can quickly generate two-dimensional DR projection images to complete rapid defect screening. It can also reconstruct CT three-dimensional images after acquiring data, balancing detection efficiency and accuracy. The continuous scanning mode improves detection efficiency and is suitable for the full life cycle detection needs of the UHV GIL unit 9 before commissioning, during operation, and after failure.

[0039] The main body 5 of the industrial CT scanner of this application has a conventional CT scanning mode and a CT / DR dual-mode scanning mode. When it is necessary to inspect the core components such as conductors and insulators of the GIL unit 9, the detector plate 3 and the X-ray source are located on the same side of the open dynamic ring 6, and the conventional CT scanning mode is used. When it is necessary to inspect the flange and welding area of ​​the GIL unit 9, the detector plate 3 and the X-ray source are located on opposite sides of the open dynamic ring 6, and the CT / DR dual-mode scanning mode is used, utilizing the X-ray beam to obliquely pass through the flange 91 to achieve bolt shielding and avoidance.

[0040] In addition, the fixed base 4 is provided with an angle adjustment mechanism, and the detection plate 3 is set on the angle adjustment mechanism. The angle adjustment mechanism is used to adjust the angle between the detection plate 3 and the radiation emitted by the radiation source, so as to realize that the radiation emitted by the radiation source is perpendicular to the detection plate 3. The fixed base 4 is provided with an L-shaped connecting plate 41, which includes a horizontal part and a vertical part connected to the horizontal part. The horizontal part is connected to the fixed base 4. The angle adjustment mechanism is set on the horizontal part. The angle adjustment mechanism includes a semi-circular slide rail 8, a slide seat 81 slidably set on the semi-circular slide rail 8, and a support plate 82 set on the slide seat 81. The detection plate 3 is installed on the support plate 82 by bolts. The slide seat 81 is provided with locking bolts for locking the slide seat 81.

[0041] More specifically, when scanning and inspecting the conductors and insulators of GIL unit 9, the detector plate 3 is placed on the same side as the X-ray source, and the open-ended moving ring 6 adopts a step-by-step mode. The open-ended moving ring 6 rotates 220 degrees, with an angle step of 1 degree and a positioning accuracy of ±0.1 degrees. After collecting projection data from each angle, a three-dimensional image is reconstructed to detect defects such as conductor cracks and insulator pores.

[0042] When scanning and inspecting flange 91 of GIL unit 9, the detector plate 3 is positioned on the opposite side of the X-ray source, and the X-ray passes obliquely through the flange 91 area. The open rotating ring 6 adopts a continuous scanning mode, rotating 220 degrees at a constant speed to collect projection data in real time and quickly generate DR images for defect screening. If necessary, the open rotating ring 6 is switched to a step-stop mode for fine CT inspection.

[0043] Meanwhile, the testing device of this application is widely applicable to defect detection of GIL and GIS products in high-voltage, ultra-high-voltage and extra-high-voltage power equipment. GIS is also known as gas-insulated metal-enclosed switchgear.

[0044] It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A detection device for ultra-high voltage GIL units, comprising an industrial CT scanner body (5) and a detection plate (3), wherein the industrial CT scanner body (5) has an X-ray source and is equipped with CT scanning and DR scanning functions, characterized in that, It also includes a base (1) and an open ring bracket (2) set on the base (1). The open ring bracket (2) has an open moving ring (6) that moves in its circumference. The industrial CT machine body (5) is set on one end of the open moving ring (6). The other end of the open moving ring (6) is located on both sides and is provided with fixed seats (4). The probe plate (3) is detachably installed on any fixed seat (4). The open ring bracket (2) is provided with a drive unit for driving the open moving ring (6) to rotate in the circumference. When the X-ray source and the detector plate (3) are located on the same side of the open dynamic ring (6), the main body (5) of the industrial CT machine is used to perform CT or DR scanning on the GIL unit (9) vertically. When the X-ray source and the detector plate (3) are located on opposite sides of the open dynamic ring (6), the main body (5) of the industrial CT machine is used to perform CT or DR scanning on the GIL unit (9) at an angle; The open annular bracket (2) has a first notch, and the open moving ring (6) has a second notch. The width of the first notch is greater than the width of the second notch, and the width of the second notch is slightly greater than the outer diameter of the flange (91) of the GIL unit (9). One end of the open ring (6) can extend into or out of the first notch area. When the open ring (6) moves circumferentially along the open ring bracket (2), the open ring (6) can close the first notch. The radiation source has a starting position and an ending position. The driving unit drives the open ring (6) to rotate circumferentially so that the radiation source can swing between the starting position and the ending position. The angle between the starting position and the ending position relative to the axis of the open ring support (2) is 220-230 degrees. The fixed base (4) is provided with an angle adjustment mechanism, and the detection plate (3) is set on the angle adjustment mechanism. The angle adjustment mechanism is used to adjust the angle between the detection plate (3) and the radiation emitted by the radiation source so as to ensure that the radiation emitted by the radiation source is perpendicular to the detection plate (3). The fixed seat (4) is provided with an L-shaped connecting plate (41). The L-shaped connecting plate (41) includes a horizontal part and a vertical part connected to the horizontal part. The horizontal part is connected to the fixed seat (4). An angle adjustment mechanism is provided on the horizontal part. The angle adjustment mechanism includes a semi-circular slide rail (8), a slide seat (81) slidably disposed on the semi-circular slide rail (8), and a support plate (82) disposed on the slide seat (81). The detection plate (3) is installed on the support plate (82). The slide seat (81) is provided with a locking bolt for locking the slide seat (81).

2. The ultra-high voltage GIL unit detection device according to claim 1, characterized in that, The inner side of the open annular bracket (2) has a groove (22) extending circumferentially. Multiple sets of rolling components are arranged circumferentially in the groove (22). The multiple sets of rolling components form an open annular track. The open moving ring (6) can roll circumferentially along the open annular track. The open moving ring (6) and the rolling components roll in cooperation.

3. The ultra-high voltage GIL unit detection device according to claim 2, characterized in that, The rolling assembly includes rolling elements located on both sides of the open moving ring (6) and arranged opposite to each other. Open annular guide rails (61) are provided on both sides of the open moving ring (6). The rolling element includes two rollers (21). The open annular guide rails (61) are embedded between the two rollers (21) on the same side and roll in cooperation with the rollers (21).

4. The ultra-high voltage GIL unit detection device according to claim 3, characterized in that, The drive unit includes a drive motor (7) and two gear shafts (73). The gear shafts (73) are rotatably mounted on an open annular bracket (2) and have gears that extend into a groove (22). An open gear ring (62) is provided on one side of the open moving ring (6). The outer side of the open gear ring (62) has external teeth that mesh with the gears. A driven wheel (74) is also provided on the gear shaft (73). A drive wheel (71) is provided on the output shaft of the drive motor (7). The drive wheel (71) and the driven wheel (74) are connected by a synchronous belt (72) or a transmission chain.

5. The ultra-high voltage GIL unit detection device according to claim 4, characterized in that, The open annular guide rail (61) has a third notch, and the open toothed ring (62) has a fourth notch. The widths of the second, third, and fourth notches are equal.

6. The ultra-high voltage GIL unit detection device according to claim 5, characterized in that, The bottom of the industrial CT machine body (5) is provided with a connecting seat (51), which is detachably and fixedly connected to the open moving ring (6) by bolts.

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