Fault detection device for power distribution network

Abstract

The invention provides a power distribution network fault detection device, and belongs to the technical field of power distribution network detection. One end of the sleeve rod penetrates through the top end of the handheld part in a sliding manner; the bottom of the guide table is rotationally matched with the other end of the sleeve rod through a ball joint; the two elastic pieces are arranged at the two ends of the guide table respectively; the two ends of the elastic piece are fixedly connected with one end of the guide table and the handheld part respectively; the two multi-joint detection flexible arms are symmetrically arranged on the two sides of the guide table respectively, each multi-joint detection flexible arm is provided with a plurality of sections, and each section is provided with a probe unit; the sensing positioning assembly is arranged in the middle of the top of the guide table; the two guide wheel sets are rotationally arranged at the two ends of the top of the guide table correspondingly; each guide wheel set comprises two guide wheels. The detection device can quickly and accurately position, is adaptive to a drooping and deformed cable, and is convenient for an inspector to carry out handheld operation on the premise of ensuring the detection precision.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network detection, and particularly relates to a distribution network fault detection device. Background Art

[0002] As a special scenario in the operation and maintenance of power systems, the detection of high-altitude distribution network cables faces complex challenges that are difficult to achieve on the ground. These cables are long-term exposed to harsh environments such as strong winds, rain, snow, and ultraviolet rays. Their insulation layers are prone to aging and cracking, and the metal shielding layers may be damaged due to lightning strikes or mechanical stresses, forming potential fault points. Therefore, it is necessary to regularly detect high-altitude cables.

[0003] Since the cables are often erected on iron towers or poles several meters high, inspection personnel usually use handheld long rod-like devices for detection. However, traditional detection devices must approach the cable in a non-contact manner with a probe for electromagnetic signal coupling. The current or electromagnetic wave in the cable generates an electromagnetic field through a conductor, and the electromagnetic field between the central conductor and the outer conductor (such as the shielding layer) of the cable is usually distributed along the axial direction of the cable. In order to comprehensively detect the electromagnetic signals of the cable, the electromagnetic probe needs to surround the cable, and the detection surface is perpendicular to the axis of the cable, so as to be able to capture the changes in the electromagnetic field inside the cable to the greatest extent. However, in the high-altitude environment, the cable will produce deformation such as sag due to its own weight, and it is difficult for the detection surface of the handheld device to be perpendicular to the axis of the cable, resulting in poor detection accuracy. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a distribution network fault detection device, which can quickly and accurately locate, and is adapted to cables with sag deformation, and is convenient for inspection personnel to hold and operate on the premise of ensuring detection accuracy.

[0005] The present invention provides the following technical solutions: A distribution network fault detection device, comprising: A handheld part; A sleeve rod, one end of which slidably penetrates through the top end of the handheld part; A guiding platform, the bottom of which is rotationally matched with the other end of the sleeve rod through a spherical joint; Two elastic members, respectively arranged at both ends of the guiding platform; both ends of the elastic member are respectively fixedly connected to one end of the guiding platform and the handheld part; Two multi-joint detection flexible arms, respectively symmetrically arranged on both sides of the guiding platform, having a plurality of segments, and each segment is provided with a probe unit; A sensing and positioning component, arranged in the middle of the top of the guiding platform; Two guiding wheel sets are respectively rotatably arranged at both ends of the top of the guiding platform; each guiding wheel set includes two guiding wheels; when in use, after the sensing and positioning component contacts the cable, a sensing signal is obtained, and according to the sensing signal, two multi-joint detection flexible arms are controlled to annularly wrap the cable, and a plurality of probe units form an annular detection state, and at the same time the cable is restricted between the two guiding wheels of each guiding wheel set.

[0006] Preferably, the handheld part includes a handheld rod and a support sleeve fixedly arranged at the top of the handheld rod; one end of the sleeve rod penetrates into the support sleeve and is slidably matched with the support sleeve; The elastic member is a guiding spring; both ends of the guiding spring are fixedly connected to the bottom of the guiding platform and the top of the support sleeve.

[0007] Preferably, the multi-joint detection flexible arm includes: Two mounting plates, fixedly arranged on one side of the guiding platform; A plurality of segments, connected in series to form a multi-joint arm; each segment includes a fixed shaft and two rotating plates; both ends of the fixed shaft are respectively fixedly connected to the middle parts of the two rotating plates; the ends of the two rotating plates of two adjacent segments are rotatably connected through a rotating shaft; the two rotating plates of the segment at one end are rotatably connected to the mounting plate; the ends of the two rotating plates of the segment at the other end are connected through an end fixing rod; A plurality of end pulleys, respectively rotatably arranged on a plurality of the rotating shafts; A plurality of middle pulleys, respectively rotatably arranged on a plurality of the fixed shafts; A rope winding assembly, arranged between the two mounting plates; An adjusting rope, one end of which is connected to the end fixing rod, and the other end alternately bypasses a plurality of the end pulleys and a plurality of the middle pulleys inside and outside in sequence, and is wound and matched with the rope winding assembly.

[0008] Preferably, the rope winding assembly includes: A rope winding shaft, rotatably arranged between the two mounting plates; the end of the other end of the adjusting rope is fixedly connected to the rope winding shaft; A motor, fixedly arranged outside one of the mounting plates, and its output shaft is in transmission connection with the rope winding shaft.

[0009] Preferably, the probe unit includes: A detection rod, the back of which is fixedly connected to the inner side of the rotating plate through a mounting rod; A limit contact pad, connected to the front of the detection rod through a buffer spring; the limit contact pad is in the middle of the connection line of the two rotating plates; A detection probe assembly, arranged inside one end of the detection rod.

[0010] Preferably, the sensing and positioning assembly includes: A flexible positioning table, fixedly arranged at the center of the guiding table; A pressure sensor, fixedly arranged at the bottom of the flexible positioning table.

[0011] Preferably, a groove is formed at the top of the guiding table; the guiding wheel is arranged in the groove, and the axle of the guiding wheel is rotatably connected to the groove wall of the groove.

[0012] Preferably, a positioning iron sheet is fixedly arranged at the bottom of the ball joint; an electromagnet is arranged at the top of the sleeve rod, and when energized, it adsorbs the positioning iron sheet to limit the rotation of the ball joint.

[0013] Advantages of the present invention: The present invention provides a distribution network fault detection device. Based on the existing handheld detection structure, a guiding table and two multi-joint flexible arms are arranged at the end. The sensing and positioning assembly in the middle of the guiding table quickly locates the position of the cable. The guiding wheel sets at both ends of the top of the guiding table limit the relative position between the whole detection device and the cable. By driving the two multi-joint detection flexible arms to wrap around the cable, the relative position accuracy between the probe unit and the cable during inspection is ensured, and accurate fault detection is achieved. Further, based on the preliminary positioning state, the two multi-joint detection flexible arms can be loosened partially and not in contact with the cable. Then, the inspection personnel can hold the fault detection device and move along the length direction of the cable. By pressing the elastic member according to the current state of the cable, combined with the telescopic sleeve rod structure and the freely rotatable ball joint structure, the angle of the guiding table is adjusted, and then the angle between the annular detection end of the whole detection device and the cable is adjusted, so that it always maintains the same plane as the cross-section of the cable axis, adapting to the cable in the sag state. The whole detection device can adjust the angle when performing the climbing and falling actions during the inspection process. This detection device does not require repeated positioning, and can re-position the probe unit through the multi-joint detection flexible arms again, can achieve continuous multi-point detection, and can ensure the detection accuracy. Description of the Drawings

[0014] Figure 1 is the assembly drawing of the distribution network fault detection device in the use state of the embodiment of the present invention; Figure 2 is the overall structure diagram of the distribution network fault detection device in the embodiment of the present invention; Figure 3 is the partial structure diagram of the distribution network fault detection device in the embodiment of the present invention; Figure 4 is the partial structure diagram of the distribution network fault detection device from another angle in the embodiment of the present invention; Figure 5It is the right view of the distribution network fault detection device according to the embodiment of the present invention.

[0015] Wherein, 1. Handheld rod; 2. Support sleeve; 3. Sleeve rod; 4. Flexible positioning platform; 5. Detection rod; 6. Guide wheel; 7. Guide platform; 8. Ball joint; 9. Guide spring; 10. Frame plate; 11. Motor; 12. Rope winding shaft; 13. Detection probe assembly; 14. Adjusting rope; 15. End fixing rod; 16. Rotating plate; 17. Limit contact pad; 18. End rope pulley; 19. Middle rope pulley; 20. Buffer spring; 21. Frame rod; 22. Cable. Detailed implementation manners

[0016] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and thus should not be construed as a limitation of the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0018] Embodiment The technical bottlenecks of high-altitude operations in the field of cable inspection mainly lie in the restriction of the special environment on the detection accuracy. In the scenario of transmission towers or poles several meters high, the inspection personnel need to hold a long rod detection device to monitor the state of the hanging cable. The traditional detection device adopts non-contact electromagnetic coupling technology. Its core principle is to collect signals by maintaining a specific electromagnetic field action distance between the probe and the cable surface. This requires that the relative position accuracy between the probe and the cable axis must be maintained at the millimeter level. However, due to the gravity and tension distribution characteristics of the cable itself, it will form a typical catenary shape and sag in the central area of the span. The maximum sag amount can reach dozens of times the cable diameter. This dynamic deformation causes continuous displacement of the spatial positions of each detection point on the cable surface. When the inspection personnel hold the device for high-altitude operations, affected by multiple factors such as the operation angle limitation, rod deflection deformation, and wind disturbance, the probe positioning completely depends on manual experience judgment, and it is difficult to establish a stable electromagnetic coupling reference plane. Especially when the cable is vibrating or swinging, manual operation cannot compensate for the spatial position deviation in real time, resulting in the attenuation of the electromagnetic signal exceeding the tolerance range of the device, and finally causing accuracy problems such as a decrease in the signal-to-noise ratio of the detection data and distortion of characteristic parameters, seriously affecting the reliability of defect judgment. For this reason, this embodiment proposes a distribution network fault detection device, which specifically includes a handheld part, a sleeve rod 3, a guiding platform 7, a sensing and positioning component, two elastic members, two multi-joint detection flexible arms, a plurality of probe units, and two guiding wheel groups.

[0019] As Figure 1 and Figure 2 shown, Figure 1 is the assembly drawing in the use state, Figure 2 is the overall structure diagram. Among them, one end of the sleeve rod 3 slides through the top end of the handheld part; the bottom of the guiding platform 7 is rotationally matched with the other end of the sleeve rod 3 through a spherical joint 8; two elastic members are respectively arranged at both ends of the guiding platform 7; both ends of the elastic member are respectively fixedly connected to one end of the guiding platform 7 and the handheld part; two multi-joint detection flexible arms are symmetrically arranged on both sides of the guiding platform 7, having multiple segments, and are used for circularly wrapping and positioning the cable 22 of the distribution network; a plurality of probe units are respectively fixedly connected to each segment of the multi-joint detection flexible arm, and form a circular detection state when circularly wrapping the cable 22; the sensing and positioning component is arranged in the middle of the top of the guiding platform 7; two guiding wheel groups are respectively rotatably arranged at both ends of the top of the guiding platform 7; each guiding wheel group includes two guiding wheels 6; when in use, after the sensing and positioning component contacts the cable 22, the cable 22 is restricted between the two guiding wheels 6 of each guiding wheel group. In order not to affect the inspection operation, a groove is opened at the top of the guiding platform 7; the guiding wheel 6 is arranged in the groove, and the wheel shaft of the guiding wheel 6 is rotationally connected to the groove wall.

[0020] In this embodiment, as Figure 1As shown in the figure, the sensing and positioning component in the middle of the guiding platform 7 quickly locates the position of the cable 22. The guiding wheel sets at both ends of the top of the guiding platform 7 limit the relative position between the entire detection device and the cable 22. By driving two multi-joint detection flexible arms to wrap around the cable, the relative position accuracy during the cable inspection by the probe unit is ensured, and accurate fault detection is achieved.

[0021] In order to achieve the inspection of the cable 22 and avoid repeated positioning (repeated disassembly and assembly at multiple detection points), and considering the factor of the cable 22 sagging due to gravity, the present invention is provided with a telescopic and swingable end, and the guiding platform 7 is provided with a guiding wheel 6 for limiting and guiding. As Figure 2 and Figure 5 shown, Figure 5 is a right view. The handheld part of this embodiment includes a handheld rod 1, a support sleeve 2 and an elastic member, and the overall detection structure and the end are cooperated through a ball joint 8 for controlling the angle adjustment of the overall detection structure. Specifically, a support sleeve 2 is fixedly arranged at the top of the handheld rod 1, and one end of the sleeve rod 3 is inserted into the support sleeve 2 and slidably cooperates with the support sleeve 2; the elastic member is a guiding spring 9; both ends of the guiding spring 9 are fixedly connected to the bottom of the guiding platform 7 and the top of the support sleeve 2. When moving to perform the inspection, release the two multi-joint detection flexible arms. When moving downward along the sagging cable 22, one end of the guiding platform 7 is pressed through the transmission of the two guiding wheels 6, and one end of the guiding spring 9 is compressed, and a part of the end of the sleeve rod 3 is pressed into the support sleeve 2, and the detection surface formed by multiple probe units is adjusted in terms of angle. When moving upward, the symmetrical structure of the entire device is deformed conversely. In this way, repeated positioning is not required during the entire cable inspection, and the detection surface always coincides with the tangent plane of the axis of the cable 22 during the entire detection process.

[0022] Specifically, as Figure 3 and Figure 4As shown in the figure, two symmetrically arranged multi-joint detection flexible arm structures are given. Specifically, the multi-joint detection flexible arm includes a rope winding assembly, an adjustment rope 14, two mounting plates 10, multiple segments, multiple end pulleys 18 and multiple middle pulleys 19. The two mounting plates 10 are fixedly arranged on one side of the guiding platform 7; multiple segments are connected in series to form a multi-joint arm; each segment includes a fixed shaft and two rotating plates 16; both ends of the fixed shaft are fixedly connected to the middle parts of the two rotating plates 16 respectively; the ends of the two rotating plates 16 of two adjacent segments are rotatably connected by a rotating shaft; the two rotating plates 16 of the segment at one end are rotatably connected to the mounting plate 10; the ends of the two rotating plates 16 of the segment at the other end are connected by an end fixing rod 15; multiple end pulleys 18 are respectively rotatably arranged on multiple rotating shafts; multiple middle pulleys 19 are respectively rotatably arranged on multiple fixed shafts; the rope winding assembly is arranged between the two mounting plates 10; one end of the adjustment rope 14 is connected to the end fixing rod 15, and the other end alternately bypasses multiple end pulleys 18 and multiple middle pulleys 19 inside and outside in sequence, and is wound and matched with the rope winding assembly. Specifically, the rope winding assembly includes a rope winding shaft 12 and a motor 11. The rope winding shaft 12 is rotatably arranged between the two mounting plates 10; the end of the other end of the adjustment rope 14 is fixedly connected to the rope winding shaft 12; the motor 11 is fixedly arranged outside one mounting plate 10, and its output shaft is in transmission connection with the rope winding shaft 12.

[0023] As Figure 2 shown in the figure, the probe unit is provided with a limit contact assembly, so that the insulating component is in direct contact with the cable 22, and the probe is set in a non-contact mode to realize fault detection. The probe unit includes a detection rod 5, a limit contact pad 17 and a detection probe assembly 13. The back of the detection rod 5 is fixedly connected to the inner side of the rotating plate 16 through a support rod 21; the limit contact pad 17 is connected to the front of the detection rod 5 through a buffer spring 20. After the limit contact pad 17 contacts the cable 22, the buffer spring 20 stores pressure and limits the position; the limit contact pad 17 is in the middle of the connection line of the two rotating plates 16; the detection probe assembly 13 is arranged inside one end of the detection rod 5. It should be noted that the detection probe assembly 13 can be a tip probe and a fusing probe, and its working mode and detection principle are both prior arts and are not limited here.

[0024] For preliminary positioning, the present invention provides a sensor assembly initially used for positioning. In this embodiment, a pressure sensor is adopted. The sensing and positioning assembly includes a flexible positioning table 4 and a pressure sensor. The flexible positioning table 4 is fixedly arranged at the center of the guiding table 7; the pressure sensor is fixedly arranged at the bottom of the flexible positioning table 4. In this embodiment, an indicator light can be arranged at the end of the handheld rod 1. When the pressure sensor detects a pressure signal, that is, after contacting the bottom of the cable 22, it can be indicated by the indicator light. Further, in order to avoid the shaking of the guiding table 7 and the two multi-joint detection flexible arms during preliminary positioning, a positioning iron sheet is fixedly arranged at the bottom of the ball joint 8; an electromagnet is arranged at the top of the sleeve rod 3, which adsorbs the positioning iron sheet to limit the rotation of the ball joint 8 when powered on.

[0025] In this embodiment, the detection device is based on the existing handheld detection structure, and a guiding table 7 and multiple joint flexible arms are arranged at the end. Through the sensing and positioning assembly in the middle of the guiding table 7, the position of the cable 22 can be quickly located; while the guiding wheel groups at both ends of the top of the guiding table 7 limit the relative position of the entire detection device and the cable 22. By driving the two multi-joint detection flexible arms to surround and wrap the cable, the relative position accuracy of the probe unit during the inspection of the cable 22 is ensured, thus realizing accurate fault detection.

[0026] In addition, based on the preliminary positioning, the device can loosen a part of the multi-joint detection flexible arms to avoid contacting the cable 22. The inspection personnel can hold the fault detection device and move along the length direction of the cable, press the elastic member in the current state of the cable, and adjust the angle of the guiding table in combination with the telescopic sleeve rod structure and the freely rotatable ball joint structure. In this way, the annular detection end of the detection device and the cable 22 always remain in the same plane as the cross-section of the cable axis, adapting to the cable in the sag state.

[0027] During the inspection process, the detection device can perform climbing and falling actions along with the angle adjustment and does not require repeated positioning. By repositioning the probe unit through the multi-joint detection flexible arms, multi-point detection can be continuously carried out and the detection accuracy can be ensured.

[0028] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A distribution network fault detection device, characterized in that, Comprising: A handheld part; A sleeve rod (3), one end of which is slidably inserted through the top end of the handheld part; A guiding platform (7), the bottom of which is rotationally engaged with the other end of the sleeve rod (3) through a ball joint (8); Two elastic members, respectively arranged at both ends of the guiding platform (7); both ends of the elastic member are respectively fixedly connected with one end of the guiding platform (7) and the handheld part; Two multi-joint detection flexible arms, respectively symmetrically arranged on both sides of the guiding platform (7), having a plurality of segments, and each segment is provided with a probe unit; A sensing and positioning component, arranged in the middle of the top of the guiding platform (7); Two guiding wheel groups, respectively rotatably arranged at both ends of the top of the guiding platform (7); each guiding wheel group includes two guiding wheels (6); when in use, after the sensing and positioning component contacts the cable (22) to obtain a sensing signal, two multi-joint detection flexible arms are controlled according to the sensing signal to annularly wrap the cable (22), and a plurality of probe units form an annular detection state, and at the same time the cable (22) is restricted between the two guiding wheels (6) of each guiding wheel group.

2. The distribution network fault detection device according to claim 1, wherein The handheld part includes a handheld rod (1) and a support sleeve (2) fixedly arranged at the top of the handheld rod (1); one end of the sleeve rod (3) is inserted into the support sleeve (2) and is slidably engaged with the support sleeve (2); The elastic member is a guiding spring (9); both ends of the guiding spring (9) are fixedly connected with the bottom of the guiding platform (7) and the top of the support sleeve (2).

3. The distribution network fault detection device according to claim 1, characterized in that, The multi-joint detection flexible arm includes: Two mounting plates (10), fixedly arranged on one side of the guiding platform (7); A plurality of segments, connected in series to form a multi-joint arm; each segment includes a fixed shaft and two rotating plates (16); both ends of the fixed shaft are respectively fixedly connected with the middle parts of the two rotating plates (16); the ends of the two rotating plates (16) of adjacent two segments are rotationally connected through a rotating shaft; the two rotating plates (16) of one end segment are rotationally connected with the mounting plate (10); the ends of the two rotating plates (16) of the other end segment are connected through an end fixing rod (15); A plurality of end pulleys (18), respectively rotatably arranged on a plurality of the rotating shafts; A plurality of middle pulleys (19), respectively rotatably arranged on a plurality of the fixed shafts; A rope winding component, arranged between the two mounting plates (10); An adjusting rope (14), one end of which is connected with the end fixing rod (15), and the other end alternately bypasses a plurality of the end pulleys (18) and a plurality of the middle pulleys (19) inside and outside in sequence, and is wound and matched with the rope winding component.

4. The distribution network fault detection device according to claim 3, characterized in that, The rope winding component includes: A rope winding shaft (12), rotatably arranged between the two mounting plates (10); the end of the other end of the adjusting rope (14) is fixedly connected with the rope winding shaft (12); A motor (11), fixedly arranged outside one of the mounting plates (10), and its output shaft is in transmission connection with the rope winding shaft (12).

5. The distribution network fault detection device according to claim 3, wherein The probe unit includes: A detection rod (5), the back of which is fixedly connected with the inner side of the rotating plate (16) through a mounting rod (21); The limit contact pad (17) is connected to the front of the detection rod (5) through a buffer spring (20); the limit contact pad (17) is in the middle of the connection line of the two rotating plates (16); The detection probe assembly (13) is arranged inside one end of the detection rod (5).

6. The distribution network fault detection device according to claim 1, wherein, The sensing and positioning assembly includes: The flexible positioning table (4) is fixedly arranged at the center of the guiding table (7); The pressure sensor is fixedly arranged at the bottom of the flexible positioning table (4).

7. The distribution network fault detection device according to claim 1, characterized in that A groove is formed at the top of the guiding table (7); the guide wheel (6) is arranged in the groove, and the axle of the guide wheel (6) is rotatably connected to the groove wall of the groove.

8. The distribution network fault detection device according to claim 1, characterized in that A positioning iron sheet is fixedly arranged at the bottom of the ball joint (8); an electromagnet is arranged at the top of the sleeve rod (3), and when powered on, it adsorbs the positioning iron sheet to limit the rotation of the ball joint (8).

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