A power distribution line ground fault detection device

Abstract

The application discloses a kind of distribution line ground fault detection device, it is related to distribution line fault detection technical field, including telescopic part, extension pipe, suspension assembly, calliper receiver, telescopic part includes central section and multiple telescopic sections, bottom of outermost telescopic section is provided with bottom disc, the top of central section is provided with connecting frame, connecting frame is provided with winding drum, and the winding drum is wound with pull rope, the top of central section is provided with guide cylinder, and pull rope passes through guide cylinder and is connected with bottom disc;Telescopic section and the outside of central section are provided with L-shaped slot, and the inside of telescopic section is provided with cooperation ball, and cooperation ball and inside corresponding L-shaped slot are mutually matched;By telescopic part, suspension assembly and calliper receiver are sent to distribution line part, and meanwhile, telescopic part is controlled to be shortened again, so that detection device realizes remote control self-inspection, and the influence of field terrain environment on inspection efficiency is avoided.

Description

Technical Field

[0001] This invention relates to the field of power distribution line fault detection technology, specifically a power distribution line grounding fault detection device. Background Technology

[0002] High-resistance grounding faults are common in power distribution lines. These faults can arise from various factors, including treetop contact with conductors, hanging objects, animal climbing on the ground, and adverse weather conditions. Problems with the conductors themselves, such as damaged insulators and aging cable joints, can also lead to high-resistance grounding. In such cases, maintenance personnel must promptly inspect the conductors for the specific location of the high-resistance fault and eliminate it to prevent further threats to the power distribution system. Current detection methods primarily involve injecting a specific frequency of alternating current into the conductor experiencing the high-resistance grounding without interrupting power. Inspection personnel then use clamp receivers to inspect the power distribution line. A sudden change in the current signal received by the clamp receivers at the high-resistance grounding location indicates the exact location of the fault, allowing for subsequent troubleshooting.

[0003] Existing inspection operations mainly involve inspectors using handheld telescopic inspection equipment to detect faulty phase lines. Inspectors need to repeatedly control the extension and retraction of the equipment and perform multiple inspections. When encountering complex environments such as trees, rivers, or ditches, the workload of inspectors is further increased, and the efficiency of high-resistance grounding fault detection is also reduced. Therefore, a power distribution line grounding fault detection device is proposed to improve inspection efficiency while reducing the impact of complex environments on detection. Summary of the Invention

[0004] The purpose of this invention is to provide a grounding fault detection device for power distribution lines to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A grounding fault detection device for power distribution lines includes a telescopic section with an extension tube. The end of the extension tube is connected to a suspension assembly, and a caliper receiver is mounted on the suspension assembly. The telescopic section includes a central section and multiple telescopic sections, forming a telescopic structure. A chassis is located at the bottom of the outermost telescopic section, and a connecting frame is located at the top of the central section. A winding drum is mounted on the connecting frame, and a pulling rope is wound on the winding drum. A guide cylinder is located at the top of the central section, and the pulling rope passes through the guide cylinder into the central section and connects to the center of the chassis at the bottom of the telescopic section. L-shaped grooves are provided on the outer sides of the telescopic sections and the central section, each L-shaped groove including a vertical section and a horizontal section. A mating ball is located on the upper inner side of each telescopic section, and the mating ball engages with the corresponding inner L-shaped groove.

[0006] As a further embodiment of the present invention: a central tube is provided at the center of the chassis, a frustum column is provided at the center of the central tube, a threaded hole is provided on the inner side of the central tube, a connecting screw is installed in the threaded hole, the connecting screw is hollow, the pulling rope passes through the connecting screw, and when the connecting screw is threadedly engaged with the threaded hole, the pulling rope is pressed and fixed to the surface of the frustum column.

[0007] As a further embodiment of the present invention: an observation hole is provided above the vertical section of the L-shaped groove, and a second mounting hole is provided above the observation hole, and the mating ball is fixedly installed in the L-shaped groove through the second mounting hole.

[0008] As a further embodiment of the present invention: the horizontal section of the L-shaped groove is arc-shaped and set at the bottom of the expansion joint and the central section, and the central angle corresponding to the horizontal section of the L-shaped groove is ninety degrees.

[0009] As a further aspect of the present invention: the chassis is provided with a plurality of abutment platforms corresponding to the expansion joints, and the abutment platforms and the bottom of the corresponding expansion joints are respectively provided with mounting holes and connecting holes, and the chassis and the outermost expansion joint are bolted together through the mounting holes and connecting holes.

[0010] As a further embodiment of the present invention: the ends of the extension tube are respectively provided with an upper extension frame and a lower extension frame, the suspension assembly includes a side frame provided at the bottom of the upper extension frame, the side frames are symmetrically arranged, and a mating wheel is rotatably installed between the symmetrically arranged side frames. The mating wheel is connected to a drive motor, and an abutment wheel is provided on the lower extension frame for lifting and lowering. The abutment wheel and the mating wheel cooperate with each other. The suspension assembly is provided in two sets along the direction of the power distribution line.

[0011] As a further embodiment of the present invention: the drive motor is mounted on the side frame near the extension tube, and a blocking plate is provided at the bottom of the side frame near the extension tube, and a guide plate is provided at the bottom of the side frame near the bottom edge of the mating wheel.

[0012] As a further embodiment of the present invention: a fixed rod is provided between the lower extension frames of the two sets of suspension assemblies, a connecting frame is provided at the axis of the abutment wheel, a lifting rod is provided at the bottom of the connecting frame, the lifting rod is inserted into the lower extension frame, a lifting frame is provided between the connecting frames of the two sets of suspension assemblies, and a lifting cylinder is provided between the fixed rod and the lifting frame.

[0013] As a further embodiment of the present invention: the outer ring of the abutting wheel is provided with an abutting groove, and when the abutting wheel and the mating wheel cooperate with each other, the power distribution wire is squeezed into the abutting groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are: (1) A telescopic structure is formed by combining multiple telescopic joints and a central joint, similar to a telescopic fishing rod. The number of telescopic joints can be flexibly adjusted as needed during use, and the height between the power distribution line and the ground at the inspection location can be adjusted accordingly. During use, the innermost telescopic joint and the central joint are first stretched and extended. At this time, the mating ball moves in the vertical section of the L-shaped groove. When the mating ball reaches the bottom of the vertical section, one hand holds the upper end of the central joint, and the other hand twists the lower telescopic joint to make the telescopic joint rotate horizontally. The mating ball slides into the horizontal section of the L-shaped groove. At this time, the central joint and the telescopic joint are extended and locked, realizing the raising of the top suspension assembly and the caliper receiver. The above operation is repeated until the suspension assembly and the caliper receiver reach the height of the power distribution line. The suspension assembly is controlled to hang on the faulty phase line, and the faulty phase is detected in conjunction with the caliper receiver.

[0015] (2) By setting a central tube in the center of the chassis, the traction rope passes through the connecting screw in advance, and then the connecting screw is connected to the threaded hole. As the connecting screw is continuously screwed in, the gap between the central hole and the truncated column gradually decreases, so that the traction rope is pressed on the surface of the truncated column, thereby achieving quick assembly and disassembly of the traction rope while ensuring the reliability of the traction rope connection.

[0016] (3) Insert the mating ball into the vertical section of the L-shaped groove through the second mounting hole to complete the installation of the outer expansion joint. Each expansion joint is installed and disassembled in accordance with the above method. When conducting field inspections, the length of the expansion joint can be quickly adjusted according to the actual field environment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the suspension assembly of the present invention.

[0019] Figure 3 This is a schematic diagram of the installation of the mating wheel and the abutment wheel of the present invention.

[0020] Figure 4 This is a schematic diagram of the telescopic part of the present invention.

[0021] Figure 5 This is a schematic diagram showing the arrangement between the traction rope and the central section of the present invention.

[0022] Figure 6 This is a schematic diagram of the chassis structure of the present invention.

[0023] Figure 7 This is a cross-sectional view of the central tube of the present invention.

[0024] Figure 8This is a schematic diagram of the combined structure of the central section and the expansion joint of the present invention.

[0025] Figure 9 This is a cross-sectional structural diagram of the expansion joint of the present invention.

[0026] Figure 10 This is a schematic diagram of the separation structure between the bottom of the telescopic joint and the chassis of the present invention.

[0027] In the diagram: 1. Telescopic section; 10. Chassis; 100. Abutment platform; 101. Mounting hole one; 102. Central tube; 1020. Threaded hole; 1021. Frustum column; 103. Connecting screw; 11. Expansion joint; 110. L-shaped groove; 111. Observation hole; 112. Mounting hole two; 1120. Mating ball; 113. Connecting hole; 12. Central section; 120. Guide tube; 13. Connecting frame; 14. 16. Winding drum; 2. Pull rope; 2. Extension tube; 20. Upper extension frame; 21. Lower extension frame; 3. Suspension assembly; 31. Side frame; 310. Guide plate; 32. Matching wheel; 320. Drive motor; 321. Blocking plate; 33. Abutment wheel; 330. Abutment groove; 34. Connecting frame; 35. Lifting rod; 36. Lifting frame; 37. Fixing rod; 38. Lifting cylinder; 4. Caliper receiver. Detailed Implementation

[0028] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0029] Furthermore, the terms "a" and "two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0032] like Figure 1 , Figure 4 , Figure 5 , Figure 8 , Figure 9 As shown, a power distribution line grounding fault detection device includes a telescopic section 1, an extension tube 2 on the telescopic section 1, a suspension assembly 3 connected to the end of the extension tube 2, a clamp receiver 4 on the suspension assembly 3, and a central section 12 and multiple telescopic sections 11 forming a telescopic structure. A base 10 is located at the bottom of the outermost telescopic section 11, and a connecting frame 13 is located at the top of the central section 12. A winding drum 1 is mounted on the connecting frame 13. 4. A pulling rope 16 is wound on the winding drum 14. A guide cylinder 120 is provided at the top of the central section 12. The pulling rope 16 passes through the guide cylinder 120 and enters the central section 12, and is connected to the center of the chassis 10 at the bottom of the telescopic section 11. An L-shaped groove 110 is provided on the outer side of the telescopic section 11 and the central section 12. The L-shaped groove 110 includes a vertical section and a horizontal section. A mating ball 1120 is provided on the upper inner side of each telescopic section 11. The mating ball 1120 and the corresponding inner L-shaped groove 110 cooperate with each other.

[0033] Specifically, a telescopic structure is formed by combining multiple telescopic joints 11 and a center section 12, similar to a telescopic fishing rod. The number of telescopic joints 11 can be flexibly adjusted as needed, based on the height of the power distribution line at the inspection location relative to the ground. In use, the innermost telescopic joint 11 and the center section 12 are first stretched. At this time, the cooperating ball 1120 moves in the vertical section of the L-shaped groove 110. When the cooperating ball 1120 reaches the bottom of the vertical section, one hand holds the upper end of the center section 12, while the other hand twists the lower telescopic joint 11, causing the telescopic joint 11 to rotate horizontally. The cooperating ball 1120 slides into the horizontal section of the L-shaped groove 110. At this point, the center section 12 and the telescopic joint 11 are extended and locked, raising the top suspension assembly 3 and the caliper receiver 4. This operation is repeated until the suspension assembly 3 and the caliper receiver 4 reach the height of the power distribution line. The suspension assembly 3 is then suspended on the faulty phase line, and the caliper receiver 4 is used to detect the faulty phase.

[0034] The suspension assembly 3 is equipped with a power unit that can move along the power distribution line, eliminating the need for repeated lifting and lowering inspections between adjacent power distribution line poles. After the suspension assembly 3 and the caliper receiver 4 are engaged with the power distribution line, the telescopic part 1 is in an extended state, making it inconvenient for the suspension assembly 3 to perform automatic movement inspection. At this time, by horizontally twisting the telescopic joint 11, since the mating balls 1120 between multiple telescopic joints 11 and between the innermost telescopic joint 11 and the center joint 12 are located in the horizontal section of the L-shaped groove 110, the horizontal twisting of the telescopic joint 11 will cause all the mating balls 1120 in the telescopic joints 11 to return to the intersection of the horizontal and vertical sections of the L-shaped groove 110. At this time, by controlling the winding drum 14 at the top of the center joint 12 to wind up the pulling rope 16, the telescopic part 1 can be controlled to retract to its shortest state. This will greatly reduce the volume of the telescopic part 1. With the suspension assembly 3 and the reduced telescopic part 1, the self-inspection operation between the suspension assembly 3 and the power distribution line can be fully realized. The inspection operator only needs to control the movement of the suspension assembly 3 on the power distribution line through the remote control device.

[0035] After the suspension assembly 3, carrying the telescopic part 1 and the caliper receiver 4, finishes inspecting the power distribution line between the two poles, the inspector reaches another pole. At this time, the telescopic part 1 is re-extended, and the telescopic joint 11 is twisted so that the matching ball 1120 slides into the horizontal section, completing the extension adjustment of the telescopic part 1. Then the suspension assembly 3 can be removed, and after passing around the power pole, the inspection of the power distribution line in the next section can continue.

[0036] The advantage of the above structure is that it eliminates the need for multiple extension and retraction tests due to terrain and environment. The inspection personnel only need to raise the detection device from one side of the pole and coordinate it with the power distribution line. The detection device will then automatically perform the inspection. The inspection personnel can then move to another pole and remove the detection device, which greatly improves the inspection efficiency and reduces the physical exertion of the inspection personnel.

[0037] Furthermore, such as Figure 5 , Figure 6 As shown, a central tube 102 is provided at the center of the chassis 10, and a frustum column 1021 is provided at the center of the central tube 102. A threaded hole 1020 is provided on the inner side of the central tube 102, and a connecting screw 103 is installed in the threaded hole 1020. The connecting screw 103 is hollow, and the pulling rope 16 passes through the connecting screw 103. When the connecting screw 103 is threadedly engaged with the threaded hole 1020, the pulling rope 16 is pressed and fixed to the surface of the frustum column 1021.

[0038] Specifically, the pull rope 16 needs to be connected to the chassis 10 in a quick-release configuration. Depending on the actual terrain, the length of the telescopic section 1 varies, requiring different numbers of telescopic joints to form the telescopic section 1. This necessitates frequent disassembly and reassembly of the chassis 10, and consequently, frequent disassembly and reassembly of the pull rope 16 connected to the chassis 10. By setting a central tube 102 at the center of the chassis 10, the pull rope 16 passes through the connecting screw 103 beforehand. The connecting screw 103 is then connected to the threaded hole 1020. As the connecting screw 103 is continuously screwed in, the gap between the central hole and the frustum 1021 gradually decreases, thus pressing the pull rope 16 tightly against the surface of the frustum 1021. This achieves quick disassembly and reassembly of the pull rope 16 while ensuring the reliability of its connection.

[0039] Furthermore, such as Figure 8 As shown, an observation hole 111 is provided above the vertical section of the L-shaped groove 110, and an installation hole 112 is provided on the upper side of the observation hole 111. The mating ball 1120 is fixedly installed in the L-shaped groove 110 through the installation hole 112.

[0040] Specifically, the purpose of setting the observation hole 111 is to facilitate the positioning of the mating ball 1120 when the upper mounting hole 2 112 is installed. When the observation hole 111 corresponds to the vertical section of the inner L-shaped groove 110, the mating ball 1120 is sent into the vertical section of the L-shaped groove 110 through the mounting hole 2 112, thereby completing the installation of the outer expansion joint 11. Each expansion joint 11 is installed and disassembled in accordance with the above method. When conducting field inspections, the length of the expansion joint 1 can be quickly adjusted according to the actual site environment.

[0041] Furthermore, such as Figure 8 As shown, the horizontal section of the L-shaped groove 110 is arc-shaped and located at the bottom of the expansion joint 11 and the central section 12. The central angle corresponding to the horizontal section of the L-shaped groove 110 is ninety degrees.

[0042] Specifically, the angle corresponding to the horizontal section of the L-shaped groove 110 is set to 90 degrees. When the telescopic part 1 is extended and adjusted to achieve the lifting and suspension, it is convenient to calculate the horizontal twisting angle based on the number of telescopic joints 11, so that the telescopic part 1 can shorten itself under the action of the top winding drum 14. For example, if the telescopic part 1 has three telescopic joints 11, then after the lifting operation is completed, the inspection personnel need to rotate it horizontally three times 90 degrees, or 270 degrees, before the winding drum 14 can be controlled to automatically retract the pulling rope 16 to shorten the telescopic part 1.

[0043] Furthermore, such as Figure 6 , Figure 10As shown, the chassis 10 is provided with a plurality of abutment platforms 100 at the corresponding positions of the telescopic joints 11. The abutment platforms 100 and the corresponding telescopic joints 11 are respectively provided with mounting holes 101 and connecting holes 113 at their bottoms. The chassis 10 and the outermost telescopic joint 11 are bolted together through the mounting holes 101 and connecting holes 113.

[0044] Specifically, the abutment platform 100 is set to facilitate the connection between the chassis 10 and the bottom of the outermost telescopic joint 11, avoiding the problem of incorrect hole alignment and enabling the telescopic joint 11 to be quickly disassembled and assembled.

[0045] Furthermore, such as Figure 2 , Figure 3 As shown, the ends of the extension tube 2 are respectively provided with an upper extension frame 20 and a lower extension frame 21. The suspension assembly 3 includes a side frame 31 disposed at the bottom of the upper extension frame 20. The side frames 31 are symmetrically arranged, and a mating wheel 32 is rotatably installed between the symmetrically arranged side frames 31. The mating wheel 32 is connected to a drive motor 320. An abutting wheel 33 is provided on the lower extension frame 21. The abutting wheel 33 and the mating wheel 32 cooperate with each other. The suspension assembly 3 is provided with two sets along the direction of the power distribution line.

[0046] Furthermore, such as Figure 2 , Figure 3 As shown, the drive motor 320 is mounted on the side frame 31 near the extension tube 2, and a baffle plate 321 is provided at the bottom of the side frame 31 near the extension tube 2. A guide plate 310 is provided at the bottom of the side frame 31 near the bottom edge of the mating wheel 32.

[0047] Specifically, after the telescopic part 1 extends and rises, the suspension assembly 3 approaches the power distribution line, causing the power distribution line to slide into the mating wheel 32 along the side frame 31, the blocking plate 321, and the guide plate 310. Finally, the control wheel 33 and the mating wheel 32 cooperate with each other, so that the power distribution line is clamped between the mating wheel 32 and the mating wheel 33. After the self-inspection is activated, the drive motor 320 drives the mating wheel 32 to move on the power distribution line, thereby completing the self-inspection operation.

[0048] More specifically, after the suspension assembly 3 and the power distribution line are coordinated, the telescopic part 1 needs to be twisted horizontally to complete the re-shortening process of the telescopic part 1. In order to ensure the smooth twisting of the telescopic part 1, two sets of suspension assemblies 3 are set. With the cooperation of the two sets of suspension assemblies 3 and the power distribution line, the problem of the suspension assembly 3 and the power distribution line being separated when the telescopic part 1 is twisted can be avoided.

[0049] Furthermore, such as Figure 2As shown, a fixing rod 37 is provided between the lower extension frames 21 in the two sets of suspension components 3, a connecting frame 34 is provided at the axis of the abutment wheel 33, a lifting rod 35 is provided at the bottom of the connecting frame 34, the lifting rod 35 is inserted into the lower extension frame 21, a lifting frame 36 is provided between the connecting frames 34 of the two sets of suspension components 3, and a lifting cylinder 38 is provided between the fixing rod 37 and the lifting frame 36.

[0050] Furthermore, such as Figure 3 As shown, the outer ring of the abutting wheel 33 is provided with an abutting groove 330. When the abutting wheel 33 and the mating wheel 32 cooperate with each other, the power distribution wire is squeezed into the abutting groove 330.

[0051] Specifically, in order to better engage the power distribution line between the mating wheel 32 and the abutting wheel 33, so that the subsequent suspension assembly 3 can smoothly carry out inspection work along the power distribution line, an abutting groove 330 is provided on the outer ring of the abutting wheel 33 to increase the contact area between the abutting wheel 33 and the mating wheel 32 and the power distribution line, so that the mating wheel 32 can move smoothly along the power distribution line for inspection when it rotates.

[0052] It should be noted that the telescopic part 1, extension tube 2, pulling rope 16, and suspension assembly 3 in the above structure are all made of insulating materials to prevent electric shock accidents from occurring to the inspection personnel during the inspection.

[0053] The working principle of this invention embodiment is as follows: Figures 1-10As shown, a telescopic structure is formed by combining multiple telescopic joints 11 and a central joint 12, similar to a telescopic fishing rod. The number of telescopic joints 11 can be flexibly adjusted as needed, based on the height of the power distribution line at the inspection location from the ground. In use, the innermost telescopic joint 11 and the central joint 12 are first stretched. At this time, the cooperating ball 1120 moves in the vertical section of the L-shaped groove 110. When the cooperating ball 1120 reaches the bottom of the vertical section, one hand holds the upper end of the central joint 12, and the other hand twists the lower telescopic joint 11, causing the telescopic joint 11 to rotate horizontally. The cooperating ball 1120 slides into the horizontal section of the L-shaped groove 110. At this point, the central joint 12 and the telescopic joint 11 are extended and locked, raising the top suspension assembly 3 and the caliper receiver 4. This operation is repeated until the suspension assembly 3 and the caliper receiver 4 reach the height of the power distribution line. The suspension assembly 3 is then suspended on the faulty phase line, and the caliper receiver 4 is used to detect the faulty phase. By setting a central tube 102 at the center of the chassis 10, the pull rope 16 is pre-passed through the connecting screw 103. Then, the connecting screw 103 is connected to the threaded hole 1020. As the connecting screw 103 is continuously screwed in, the gap between the central hole and the frustum column 1021 gradually decreases, thereby pressing the pull rope 16 tightly against the surface of the frustum column 1021. This achieves quick installation and removal of the pull rope 16 while ensuring the reliability of the pull rope 16 connection. The mating ball 1120 is fed into the vertical section of the L-shaped groove 110 through the second mounting hole 112, thereby completing the installation of the outer expansion joint 11. Each expansion joint 11 is installed and removed in accordance with the above method. During field inspections, the length of the expansion joint 1 can be quickly adjusted according to the actual site environment.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power distribution line ground fault detection device, comprising a telescopic part (1), an extension tube (2) is arranged on the telescopic part (1), an end of the extension tube (2) is connected with a suspension assembly (3), a caliper receiver (4) is arranged on the suspension assembly (3), characterized in that, The telescopic part (1) includes a central section (12) and multiple telescopic sections (11). The central section (12) and multiple telescopic sections (11) form a telescopic structure. A chassis (10) is provided at the bottom of the outermost telescopic section (11). A connecting frame (13) is provided at the top of the central section (12). A winding drum (14) is provided on the connecting frame (13). A pulling rope (16) is wound on the winding drum (14). A guide cylinder (120) is provided at the top of the central section (12). The pulling rope (16) passes through the guide cylinder (120) and enters the central section (12), and is connected to the center of the chassis (10) at the bottom of the telescopic section (11). The expansion joint (11) and the center joint (12) are provided with L-shaped grooves (110) on their outer sides. The L-shaped grooves (110) include vertical sections and horizontal sections. Each expansion joint (11) is provided with a mating ball (1120) on its inner upper side. The mating ball (1120) and the corresponding L-shaped groove (110) on the inner side are mated to each other.

2. A power distribution line ground fault detection device according to claim 1, wherein, The chassis (10) has a central tube (102) at its center, and a frustum column (1021) is located at the center of the central tube (102). A threaded hole (1020) is located on the inner side of the central tube (102), and a connecting screw (103) is installed in the threaded hole (1020). The connecting screw (103) is hollow, and the pulling rope (16) passes through the connecting screw (103). When the connecting screw (103) and the threaded hole (1020) are threaded together, the pulling rope (16) is pressed and fixed on the surface of the frustum column (1021).

3. The power distribution line grounding fault detection device according to claim 1, characterized in that, An observation hole (111) is provided above the vertical section of the L-shaped groove (110), and an installation hole (112) is provided on the upper side of the observation hole (111). The mating ball (1120) is fixedly installed in the L-shaped groove (110) through the installation hole (112).

4. The power distribution line grounding fault detection device according to claim 1, characterized in that, The horizontal section of the L-shaped groove (110) is arc-shaped and located at the bottom of the expansion joint (11) and the center section (12). The central angle corresponding to the horizontal section of the L-shaped groove (110) is 90 degrees.

5. A power distribution line grounding fault detection device according to claim 1, characterized in that, The chassis (10) is provided with multiple abutment platforms (100) at the corresponding parts of the expansion joint (11). The abutment platform (100) and the bottom of the corresponding expansion joint (11) are respectively provided with mounting hole 1 (101) and connecting hole (113). The chassis (10) and the outermost expansion joint (11) are bolted together through mounting hole 1 (101) and connecting hole (113).

6. The power distribution line grounding fault detection device according to claim 1, characterized in that, The ends of the extension tube (2) are respectively provided with an upper extension frame (20) and a lower extension frame (21). The suspension assembly (3) includes a side frame (31) provided at the bottom of the upper extension frame (20). The side frames (31) are symmetrically arranged, and a mating wheel (32) is rotatably installed between the symmetrically arranged side frames (31). The mating wheel (32) is connected to a drive motor (320). An abutment wheel (33) is provided on the lower extension frame (21) for lifting. The abutment wheel (33) and the mating wheel (32) cooperate with each other. The suspension assembly (3) is provided with two sets along the direction of the power distribution line.

7. A power distribution line grounding fault detection device according to claim 6, characterized in that, The drive motor (320) is mounted on the side frame (31) near the extension tube (2), and a baffle plate (321) is provided at the bottom of the side frame (31) near the extension tube (2), and a guide plate (310) is provided at the bottom of the side frame (31) near the bottom edge of the mating wheel (32).

8. A power distribution line grounding fault detection device according to claim 6, characterized in that, A fixing rod (37) is provided between the lower extension frame (21) of the two sets of suspension assemblies (3), a connecting frame (34) is provided at the axis of the abutment wheel (33), a lifting rod (35) is provided at the bottom of the connecting frame (34), the lifting rod (35) is inserted into the lower extension frame (21), a lifting frame (36) is provided between the connecting frames (34) of the two sets of suspension assemblies (3), and a lifting cylinder (38) is provided between the fixing rod (37) and the lifting frame (36).

9. A power distribution line grounding fault detection device according to claim 6, characterized in that, The outer ring of the abutting wheel (33) is provided with an abutting groove (330). When the abutting wheel (33) and the mating wheel (32) are mated together, the power distribution wire is squeezed into the abutting groove (330).

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