A passive wireless impulse current partial discharge sensor

Abstract

The application discloses a passive wireless pulse current partial discharge sensor and relates to the technical field of partial discharge sensors.The passive wireless pulse current partial discharge sensor comprises a monitor, angle irons are fixedly arranged on the two sides of the monitor, and further comprises a bottom plate which is connected with the monitor through a multi-angle adjusting structure.The multi-angle adjusting structure is used for flexibly adjusting the angle of the monitor and installing the monitor in a required area for current measurement.The monitor detection surface is dynamically adjusted along with the direction of a partial discharge signal source, the capture precision of weak pulse current is remarkably improved, the foldable shielding cover is synchronously unfolded along with the angle adjustment of the monitor, a metal shielding plate and a honeycomb-shaped electromagnetic wave absorbing layer form an "electric-magnetic" double shielding system, the distortion influence of interference signals on current measurement is avoided, and the opening of a swing leaf in the shielding and heat radiating structure is automatically adjusted along with the angle, so that the accurate collection of current signals is realized under stable working conditions, and the reliability of partial discharge monitoring is comprehensively improved.

Description

Technical Field

[0001] This invention relates to the field of partial discharge sensor technology, and in particular to a passive wireless pulse current partial discharge sensor. Background Technology

[0002] When partial discharge occurs in power equipment, a pulse current is usually generated on its grounding lead or other ground potential connection line. The pulse current signal flowing through the insulator is monitored by a pulse current partial discharge monitoring device to realize the live detection of partial discharge in power equipment.

[0003] Existing passive wireless pulse current partial discharge sensors face significant technical bottlenecks in practical applications: their installation structure lacks angle adjustment flexibility, making it difficult to adapt to the complex spatial layout of power equipment, resulting in a significant weakening of the ability to capture weak discharge signals and a substantial increase in the risk of missing early insulation defects; the electromagnetic shielding and heat dissipation systems of the equipment are mutually restrictive, the fixed protective structure cannot adaptively adjust with the installation angle, dust accumulation is a prominent hazard in vertical scenarios, and electromagnetic interference can easily penetrate in horizontal layouts, causing signal quality and equipment temperature rise to deteriorate simultaneously; more importantly, angle adjustment and functional component calibration during on-site operation and maintenance require step-by-step operations, which are cumbersome and time-consuming, and manual adjustment errors are unavoidable, directly leading to a significant decrease in detection accuracy, which can no longer meet the technical requirements of smart grids for accurate monitoring of equipment status. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of difficulty in adjusting the installation angle in the prior art, and to propose a passive wireless pulse current partial discharge sensor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A passive wireless pulse current partial discharge sensor includes a monitor, with angle irons fixedly mounted on both sides of the monitor, and further includes:

[0007] The base plate is connected to the monitor via a multi-angle adjustment structure. This structure allows the monitor to be flexibly adjusted to the desired angle for current measurement. Heat dissipation structures are located on both sides of the monitor, changing accordingly with the adjustment of the multi-angle adjustment structure to ensure the ventilation angle matches the current operating angle. A foldable shielding cover is located on the top of the monitor, unfolding synchronously with the angle changes of the multi-angle adjustment structure to enhance the shielding effect against electromagnetic interference.

[0008] In the aforementioned passive wireless pulse current partial discharge sensor, each of the two angle irons has two mounting holes, which are elliptical in shape. Two fixed angle plates are fixedly installed at the four corners of the base plate. Universal joints are rotatably installed between the two fixed angle plates. A spring column is fixedly installed on each universal joint. The upper end of each spring column passes through the corresponding mounting hole and is fixedly installed with a baffle. A tension spring is sleeved on the outside of each spring column, and the lower end of each tension spring is fixedly installed on the corresponding universal joint.

[0009] In the aforementioned passive wireless pulse current partial discharge sensor, a connecting frame is fixedly installed on the base plate. The connecting frame has a circular groove and a square groove, and the circular groove and the square groove are connected. A limit guide block is slidably arranged in the square groove. A torsion rod is fixedly arranged on one side of the limit guide block. A fixing ring is fixedly arranged in the circular groove. A connecting rod is fixedly installed on the fixing ring. One end of the connecting rod has a slot for cooperating with the limit guide block.

[0010] In the aforementioned passive wireless pulse current partial discharge sensor, the shape of the square groove is the same as that of the limiting guide block, the axial length of the circular groove and the slot is greater than the axial length of the limiting guide block on the torsion bar, and the diameter of the torsion bar is smaller than the diameter of the circular groove.

[0011] In the aforementioned passive wireless pulse current partial discharge sensor, a sliding groove is provided on the base plate, and two fixed sleeves are fixedly installed in the sliding groove. The two fixed sleeves are threaded together with a threaded rod, and a sliding seat is rotatably installed on the threaded rod, and the sliding seat is slidably disposed in the sliding groove.

[0012] In the aforementioned passive wireless pulse current partial discharge sensor, the multi-angle adjustment structure includes a rotating bracket rotatably mounted at one end of a connecting rod. The rotating bracket is fixedly connected to the bottom of the monitor with a fixed plate. A universal rod is rotatably mounted on the rotating bracket. A slip ring is fixedly mounted at one end of the universal rod. An arc-shaped guide rail is fixedly mounted on the sliding seat, and the slip ring is slidably mounted on the arc-shaped guide rail. A fixing screw is threaded onto the slip ring.

[0013] In the aforementioned passive wireless pulse current partial discharge sensor, the foldable shield is composed of multiple metal shielding plates connected by hinges. One end of the foldable shield is hinged to the top of the monitor, and the other end is connected to the rotating bracket via a linkage rod. When the rotating bracket rotates with the multi-angle adjustment structure, the linkage rod drives the foldable shield to unfold or fold, so that the shielding surface of the foldable shield always corresponds to the detection surface of the monitor, thereby enhancing the shielding effect against electromagnetic interference.

[0014] In the aforementioned passive wireless pulse current partial discharge sensor, an electromagnetic absorbing layer is provided on the inner side of the foldable shield, and the electromagnetic absorbing layer adopts a honeycomb structure; the linkage rod includes an inner rod and an outer rod that are nested together, and a return spring is provided between the inner rod and the outer rod. The return spring is used to provide a buffering force when the rotating bracket rotates, so that the foldable shield can be smoothly unfolded or folded, thereby achieving shielding against electromagnetic interference at different angles.

[0015] In the aforementioned passive wireless pulse current partial discharge sensor, the heat dissipation structure includes multiple air inlets on the monitor, multiple mounting plates are fixedly installed on one side of the monitor, and a rotating shaft is rotatably installed between two corresponding mounting plates. A swivel blade is fixedly installed on each rotating shaft, and an incomplete gear is fixedly installed on each rotating shaft.

[0016] In the aforementioned passive wireless pulse current partial discharge sensor, a through hole is provided on one side of the monitor, and two universal balls are fixedly installed on the base plate. Each of the two universal balls is rotatably equipped with a rack, and the rack slides in the through hole to mesh with multiple incomplete gears.

[0017] Compared with existing technologies, the advantages of this invention are as follows: the detection surface of the monitor is dynamically adjusted according to the direction of the partial discharge signal source, eliminating the signal attenuation blind zone of fixed installation from a physical level, significantly improving the capture accuracy of weak pulse current. At the same time, the foldable shielding cover unfolds synchronously with the monitor angle adjustment, and the metal shielding plate and the honeycomb electromagnetic absorption layer form an "electromagnetic" dual shielding system, which forms an omnidirectional barrier against complex electromagnetic interference in substations, avoiding the distortion effect of interference signals on current measurement. In addition, the swing blades in the shielding heat dissipation structure automatically adjust the opening degree according to the angle, ensuring that the equipment can accurately acquire current signals under stable operating conditions, thus comprehensively improving the reliability of partial discharge monitoring. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a passive wireless pulse current partial discharge sensor proposed in this invention;

[0019] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the base plate in this invention;

[0021] Figure 4 This is a schematic diagram of the monitor in this invention;

[0022] Figure 5 In this invention Figure 4 Top view;

[0023] Figure 6In this invention Figure 5 Cross-sectional view of the structure along the AA direction;

[0024] Figure 7 In this invention Figure 6 Enlarged structural diagram of part a;

[0025] Figure 8 This is a schematic diagram of the incomplete gear structure in this invention;

[0026] Figure 9 This is a top view of the rotating bracket in this invention;

[0027] Figure 10 In this invention Figure 9 A cross-sectional view of the structure along the BB direction.

[0028] In the diagram: 1. Monitor; 2. Angle iron; 3. Base plate; 4. Fixed angle plate; 5. Baffle; 6. Tension spring; 7. Spring column; 8. Connecting frame; 9. Torsion bar; 10. Universal joint; 11. Fixed screw; 12. Slip ring; 13. Arc guide rail; 14. Slide groove; 15. Fixed sleeve; 16. Threaded rod; 17. Universal rod; 18. Sliding seat; 19. Fixed plate; 20. Rotating bracket; 21. Universal ball; 22. Gear rack; 23. Mounting plate; 24. Rotating shaft; 25. Oscillating blade; 26. Mounting hole; 27. Incomplete gear; 28. Air inlet; 29. ​​Fixed ring; 30. Circular groove; 31. Square groove; 32. Limiting guide block. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Reference Figures 1-3 and Figures 9-10 A passive wireless pulse current partial discharge sensor includes a monitor 1. Angle irons 2 are fixedly installed on both sides of the monitor 1. Two mounting holes 26 are opened on each angle iron 2. The mounting holes 26 are elliptical. Two fixed angle plates 4 are fixedly installed at the four corners of the base plate 3. Universal shafts 10 are rotatably installed between the two fixed angle plates 4. A spring column 7 is fixedly installed on each universal shaft 10. The upper end of each spring column 7 passes through the corresponding mounting hole 26 and is fixedly installed with a baffle 5. A tension spring 6 is sleeved on the outside of each spring column 7, and the lower end of the tension spring 6 is fixedly installed on the corresponding universal shaft 10. When the angle of the monitor 1 changes, the multiple tension springs 6 and the spring columns 7 cooperate to achieve stable adjustment of the monitor 1.

[0031] It also includes: a base plate 3, through which the monitor 1 is installed in the required position. The base plate 3 is connected to the monitor 1 through a multi-angle adjustment structure. A connecting frame 8 is fixedly installed on the base plate 3. The connecting frame 8 has a circular groove 30 and a square groove 31, and the circular groove 30 and the square groove 31 are connected. A limit guide block 32 is slidably arranged in the square groove 31. A torsion bar 9 is fixedly installed on one side of the limit guide block 32. A fixing ring 29 is fixedly arranged in the circular groove 30. A connecting rod is fixedly installed on the fixing ring 29. One end of the connecting rod is open. A slot is provided for use with the limiting guide block 32. The shape of the square slot 31 is the same as that of the limiting guide block 32. The axial length of the circular slot 30 and the slot is greater than the axial length of the limiting guide block 32 on the torsion bar 9. The diameter of the torsion bar 9 is smaller than the diameter of the circular slot 30. A sliding groove 14 is provided on the base plate 3. Two fixing sleeves 15 are fixedly installed in the sliding groove 14. The two fixing sleeves 15 are threaded together with a threaded rod 16. A sliding seat 18 is rotatably installed on the threaded rod 16 and is slidably disposed in the sliding groove 14. A multi-angle adjustment structure allows the monitor 1 to be flexibly adjusted to install in the required area for current measurement. The multi-angle adjustment structure includes a rotating bracket 20 rotatably disposed at one end of the connecting rod. A fixing plate 19 is fixedly connected to the bottom of the monitor 1.

[0032] When adjusting the angle of monitor 1, the torsion bar 9 is pushed towards the rotating bracket 20, causing the limiting guide block 32 on the torsion bar 9 to engage in the slot. The torsion bar 9 rotates within the square groove 31. At this time, rotating the torsion bar 9, a scale is set on the outer circumference of the torsion bar 9 on the connecting frame 8, and a protrusion is set on the torsion bar 9. By observing the angle formed between the protrusion and the scale, the required angle of monitor 1 is adjusted, achieving precise adjustment. Simultaneously, with the cooperation of the limiting guide block 32 and the slot, the torsion bar 9 drives the rotating bracket 20 via the connecting rod. 0 rotation, the rotating bracket 20 drives the monitor 1 to rotate in the X-axis direction through the fixed plate 19 (this direction is set as the X-axis, and the plane perpendicular to it is set as the Y-axis). After the angle of the monitor 1 is adjusted, the torsion bar 9 is pulled in the opposite direction, so that part of the limit guide block 32 is located in the slot, and the other part is located between the square slot 31 and the round slot 30, realizing the positioning after the angle adjustment, ensuring the stability of the position of the monitor 1, and during the angle adjustment process, the stretching spring 6 and the spring column 7 are deformed accordingly to stabilize the monitor 1.

[0033] A universal joint 17 is rotatably mounted on the rotating bracket 20. A slip ring 12 is fixedly mounted on one end of the universal joint 17. An arc-shaped guide rail 13 is fixedly mounted on the sliding seat 18, and the slip ring 12 is slidably mounted on the arc-shaped guide rail 13. A fixing screw 11 is threaded onto the slip ring 12. Twisting the fixing screw 11 keeps the slip ring 12 and the arc-shaped guide rail 13 in a sliding state. The arc-shaped guide rail 13 is also equipped with a scale. By pulling the slip ring 12 to rotate on the arc-shaped guide rail 13, the angle of the monitor 1 in the Y-axis direction can be adjusted. After the angle adjustment is completed, the fixing screw 11 is twisted in the opposite direction to keep the slip ring 12 and the arc-shaped guide rail 13 relatively fixed. An arc-shaped groove is provided around the outer circumference of the arc-shaped guide rail 13, and a threaded groove is provided at the front end of the fixing screw 11. The cooperation between the threaded groove and the arc-shaped groove can increase the friction between the slip ring 12 and the arc-shaped guide rail 13, keeping the monitor 1 stable.

[0034] The following parts are not shown in the figures. The top of the monitor 1 is equipped with a foldable shielding cover. The foldable shielding cover is composed of multiple metal shielding plates connected by hinges. One end of the foldable shielding cover is hinged to the top of the monitor 1, and the other end is connected to the rotating bracket 20 through a linkage rod. When the rotating bracket 20 rotates with the multi-angle adjustment structure, the linkage rod drives the foldable shielding cover to unfold or fold, so that the shielding surface of the foldable shielding cover always corresponds to the detection surface of the monitor 1, thereby enhancing the shielding effect against electromagnetic interference.

[0035] The inner side of the foldable shielding cover is provided with an electromagnetic absorbing layer, which adopts a honeycomb structure. The linkage rod includes an inner rod and an outer rod that are nested together. A return spring is provided between the inner rod and the outer rod. The return spring is used to provide a buffer force when the rotating bracket 20 rotates, so that the foldable shielding cover can be smoothly unfolded or folded, thereby achieving shielding against electromagnetic interference at different angles and avoiding the influence on the detection signal of the monitor 1.

[0036] The foldable shielding cover is mechanically coupled to the rotating bracket 20 via a linkage rod. When the monitor 1 rotates with the multi-angle adjustment structure, the shielding cover unfolds / folds synchronously, and its shielding surface always maintains a relatively fixed angle with the detection surface. Compared with traditional fixed shielding covers, it improves the attenuation capability of electromagnetic interference (such as switchgear operation pulses and substation radio frequency noise), improves the signal-to-noise ratio of partial discharge signals, and avoids interference overwhelming the real discharge signal. The honeycomb electromagnetic absorbing layer (such as a ferrite honeycomb structure) on the inner side of the shielding cover utilizes the multi-cavity resonance principle to enhance the absorption rate of high-frequency interference from 200MHz to 3GHz. When the interference signal penetrates the metal shielding plate, the absorbing layer further converts it into heat energy, solving the problem of "reflection interference leading to secondary coupling" in traditional metal shielding, which is especially suitable for suppressing narrowband interference generated by high-frequency switching operations in substations. The metal shielding plate provides electrostatic shielding (attenuating low-frequency interference), and the honeycomb absorbing layer is responsible for magnetic shielding (attenuating high-frequency interference), forming an "electromagnetic" dual shielding system.

[0037] Reference Figures 3-8 The monitor 1 has heat dissipation structures on both sides. The heat dissipation structures change accordingly with the adjustment of the multi-stage adjustment structure to make the electromagnetic shielding and ventilation angles adapt to the current usage angle. The heat dissipation structure includes multiple air inlets 28 on the monitor 1. Multiple mounting plates 23 are fixedly installed on one side of the monitor 1. A rotating shaft 24 is rotatably installed between each pair of mounting plates 23. A swing vane 25 is fixedly installed on each rotating shaft 24. An incomplete gear 27 is fixedly installed on each rotating shaft 24. A through hole is opened on one side of the monitor 1. Two universal balls 21 are fixedly installed on the base plate 3. A rack 22 is rotatably installed on each of the two universal balls 21. The rack 22 slides in the through hole and meshes with the multiple incomplete gears 27.

[0038] The omnidirectional ball 21 allows the rack 22 to rotate along the length of the monitor 1. If multiple sets of blades 25 are placed on the front and rear sides of the monitor 1, the rack 22 rotates on the omnidirectional ball 21 along the width of the monitor 1. When the angle of the monitor 1 changes, the rack 22 rotates on the omnidirectional ball 21, changing with the angle of the monitor 1. This causes the rack 22 on the lower angle side to slide upward relative to multiple incomplete gears 27, driving the rotating shaft 24 to rotate. The rotation of multiple rotating shafts 24 drives multiple blades 25 to relatively seal the air inlet 28. The opposite occurs on the side with a higher horizontal height after the monitor 1 angle is adjusted. When the blades 25 rotate synchronously, the blades 25 on the lower angle side close to form a continuous shielding surface, improving the attenuation of electromagnetic interference (such as grounding loop pulse noise) from the bottom of the equipment; the blades 25 on the higher angle side maintain a basic opening, taking into account both heat dissipation and shielding.

[0039] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A passive wireless impulse current partial discharge sensor comprising a monitor (1), characterized in that, Angle irons (2) are fixedly installed on both sides of the monitor (1), and it also includes: The base plate (3) is connected to the monitor (1) through a multi-angle adjustment structure. The multi-angle adjustment structure allows the monitor (1) to be flexibly adjusted to the required angle and installed in the required area for current measurement. Both sides of the monitor (1) are provided with heat dissipation structures. The heat dissipation structures change accordingly with the adjustment of the multi-section adjustment structure so that the ventilation angle is adapted to the current use angle. The top of the monitor (1) is provided with a foldable shielding cover. The foldable shielding cover unfolds synchronously with the angle change of the multi-section adjustment structure to enhance the shielding effect against electromagnetic interference. A connecting frame (8) is fixedly installed on the base plate (3). A circular groove (30) and a square groove (31) are provided on the connecting frame (8), and the circular groove (30) and the square groove (31) are connected. A limit guide block (32) is slidably arranged in the square groove (31). A torsion rod (9) is fixedly arranged on one side of the limit guide block (32). A fixing ring (29) is fixedly arranged in the circular groove (30). A connecting rod is fixedly installed on the fixing ring (29). A slot for cooperating with the limit guide block (32) is provided at one end of the connecting rod. The shape of the square groove (31) is the same as that of the limiting guide block (32). The axial length of the circular groove (30) and the slot is greater than the axial length of the limiting guide block (32) on the torsion bar (9). The diameter of the torsion bar (9) is smaller than the diameter of the circular groove (30). The base plate (3) is provided with a sliding groove (14), and two fixed sleeves (15) are fixedly installed in the sliding groove (14). The two fixed sleeves (15) are threaded together with a threaded rod (16). A sliding seat (18) is rotatably installed on the threaded rod (16), and the sliding seat (18) is slidably disposed in the sliding groove (14). The multi-angle adjustment structure includes a rotating bracket (20) rotatably mounted at one end of a connecting rod. The rotating bracket (20) is fixedly connected to the bottom of the monitor (1) with a fixing plate (19). A universal rod (17) is rotatably mounted on the rotating bracket (20). A slip ring (12) is fixedly mounted at one end of the universal rod (17). An arc-shaped guide rail (13) is fixedly mounted on the sliding seat (18), and the slip ring (12) is slidably mounted on the arc-shaped guide rail (13). A fixing screw (11) is threaded onto the slip ring (12). The foldable shield is composed of multiple metal shielding plates connected by hinges. One end of the foldable shield is hinged to the top of the monitor (1), and the other end is connected to the rotating bracket (20) through a linkage rod. When the rotating bracket (20) rotates with the multi-angle adjustment structure, the linkage rod drives the foldable shield to unfold or fold, so that the shielding surface of the foldable shield always corresponds to the detection surface of the monitor (1), thereby enhancing the shielding effect against electromagnetic interference.

2. A passive wireless pulsed current PD sensor according to claim 1, wherein, Two mounting holes (26) are provided on each of the two angle irons (2). The mounting holes (26) are elliptical. Two fixed angle plates (4) are fixedly installed at the four corners of the base plate (3). A universal joint (10) is rotatably installed between the two fixed angle plates (4). A spring column (7) is fixedly installed on each universal joint (10). The upper end of each spring column (7) passes through the corresponding mounting hole (26) and is fixedly installed with a baffle (5). A tension spring (6) is sleeved on the outside of each spring column (7), and the lower end of the tension spring (6) is fixedly installed on the corresponding universal joint (10).

3. A passive wireless pulsed current PD sensor according to claim 1, wherein, The inner side of the foldable shield is provided with an electromagnetic absorbing layer, which adopts a honeycomb structure; the linkage rod includes an inner rod and an outer rod that are nested together, and a return spring is provided between the inner rod and the outer rod. The return spring is used to provide a buffer force when the rotating bracket (20) rotates, so that the foldable shield can be smoothly unfolded or folded, thereby achieving shielding against electromagnetic interference at different angles.

4. The passive wireless impulse current partial discharge sensor of claim 1, wherein, The heat dissipation structure includes multiple air inlets (28) on the monitor (1). Multiple mounting plates (23) are fixedly installed on one side of the monitor (1). A rotating shaft (24) is rotatably installed between two corresponding mounting plates (23). A sway vane (25) is fixedly installed on each rotating shaft (24). An incomplete gear (27) is fixedly installed on each rotating shaft (24).

5. A passive wireless pulsed current PD sensor according to claim 4, wherein, The monitor (1) has a perforation on one side, and two universal balls (21) are fixedly installed on the base plate (3). Each of the two universal balls (21) is rotatably equipped with a rack (22), and the rack (22) slides in the perforation and meshes with multiple incomplete gears (27).

Images