A power distribution network fault detection device

Abstract

This invention relates to the field of power grid detection technology and discloses a power distribution network fault detection device, comprising a housing, a first drive wheel and a second drive wheel rotatably disposed within the housing, a flaw detector installed within the housing, a first drum and a second drum rotatably disposed inside the housing, with a strip of adhesive tape shared between the first drum and the second drum, and an arc blade positioned above the adhesive tape. An electric actuator is mounted on the outside of the housing, with its telescopic end connected to the arc blade. As the housing moves along the cable, the flaw detector detects faults in the cable along the path of the housing. When a fault is detected, a second motor drives the first drum to rotate, causing the complete strip of adhesive tape to rotate above the cable. Subsequently, the electric actuator drives the arc blade to press down, cutting off the middle portion of the adhesive tape and attaching it to the cable, thus marking the location of the cable fault. In summary, this device facilitates the rapid location and marking of cable faults, thereby improving the efficiency of cable flaw detection.

Description

Technical Field

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

[0002] Distribution network fault detection is a crucial step in ensuring the safe and stable operation of the power system. Distribution network fault detection technology mainly relies on a variety of advanced detection methods and analysis techniques to achieve rapid and accurate identification of potential or existing faults in the distribution network.

[0003] These technologies typically combine intelligent inspection, online monitoring, and data analysis to improve the efficiency and accuracy of fault detection. The principle of intelligent inspection and monitoring technology is to utilize advanced equipment such as intelligent inspection robots, drones, and infrared thermal imaging to perform real-time online monitoring of power distribution network lines and equipment. This is suitable for regular inspections of critical lines and equipment, as well as immediate monitoring of sudden faults. The principle of traveling wave positioning technology is based on the fact that when a fault occurs in the power distribution network, electromagnetic waves (traveling waves) similar to seismic waves are generated in the power cables. Traveling wave positioning technology captures and records these waves in real time by installing traveling wave sensors or monitoring terminals along the power distribution lines. The system uses signals and then employs traveling wave ranging principles and time difference algorithms to accurately locate fault points, suitable for rapid location of faults such as short circuits, grounding, and open circuits; it utilizes big data and artificial intelligence technologies: through big data platforms and AI algorithms, it mines and analyzes massive amounts of power grid operation data to achieve fault prediction and diagnosis, suitable for long-term monitoring and fault early warning of distribution network operation status; and it employs automation and information technology principles: by installing various sensors and monitoring equipment, it collects distribution network operation data in real time, and in conjunction with advanced fault diagnosis software systems, it achieves automatic fault identification and location, suitable for comprehensive monitoring of distribution networks and rapid fault response.

[0004] Currently, existing technologies for detecting cable flaws in power distribution networks typically require workers to use handheld cable flaw detectors to scan the cables at close range to determine if there are cracks or damage to the cable insulation layer. However, this is not convenient for detecting flaws in cables at high locations, which can easily affect the efficiency of cable flaw detection. Therefore, it does not meet the current needs. To address this, we propose a power distribution network fault detection device. Summary of the Invention

[0005] This invention provides a power distribution network fault detection device, which facilitates the flaw detection of cables at high locations, thereby improving the efficiency of cable flaw detection. It solves the problem mentioned in the background art that when performing flaw detection on cables in power distribution networks, workers usually need to use a handheld cable flaw detector to scan the cable at close range to determine whether there are cracks or damages in the insulation layer of the cable sheath. However, this is not convenient for flaw detection of cables at high locations, which can easily affect the efficiency of cable flaw detection.

[0006] This invention provides the following technical solution: a power distribution network fault detection device, comprising a housing, a first drive wheel and a second drive wheel rotatably disposed within the housing, a first motor for driving the second drive wheel disposed within the housing, a storage battery installed within the housing, a flaw detector installed within the housing, the flaw detector being electrically connected to a probe head, a fixing ring installed within the housing, the probe head being inserted into the side of the fixing ring, a first drum and a second drum rotatably disposed within the housing, a tape being provided between the first drum and the second drum, a second motor being installed within the housing and drivenly connected to the first drum, an arc blade disposed above the tape, and an electric push rod being installed on the outside of the housing, the telescopic end of the electric push rod being inserted into the side of the housing and connected to the arc blade.

[0007] As an optional solution of the power distribution network fault detection device of the present invention, the housing includes an upper shell and a lower shell rotatably connected to the upper shell, a fastener is provided between the upper shell and the lower shell, the fastener is used to fix the upper shell and the lower shell, the first drive wheel is rotatably disposed in the upper shell, and the second drive wheel is rotatably disposed in the lower shell;

[0008] A first driven wheel is rotatably disposed inside the upper shell, and a second driven wheel is rotatably disposed inside the lower shell. The first driving wheel and the first driven wheel abut against the upper side of the cable to be detected, and the second driving wheel and the second driven wheel abut against the lower side of the cable to be detected.

[0009] As an optional embodiment of the power distribution network fault detection device of the present invention, wherein: a first gear is coaxially mounted on the first drive wheel, the output shaft of the first motor is connected to the second drive wheel for transmission, a second gear is sleeved in the middle of the output shaft of the first motor, the first gear meshes with the second gear, the battery is disposed on the side away from the first motor, and a wire is electrically connected to the outside of the first motor, the end of the wire being electrically connected to the battery.

[0010] As an optional embodiment of the power distribution network fault detection device of the present invention, the number of the detection heads is set to several, and the several detection heads are evenly inserted in a circumferential direction on the side of the fixed ring. The several detection heads are connected in series by the wire and then electrically connected to the flaw detector. The fixed ring includes an upper half ring and a lower half ring hinged to the upper half ring. The upper half ring is connected to the inner wall of the upper shell, and the lower half ring is connected to the inner wall of the lower shell. The fixed ring is sleeved on the outside of the cable to be detected.

[0011] As an optional embodiment of the power distribution network fault detection device of the present invention, a first controller is installed inside the housing, the signal input terminal of the first controller is electrically connected to the signal output terminal of the flaw detector through the wire, and the signal output terminal of the first controller is electrically connected to the first motor and the second motor through the wire respectively.

[0012] As an optional embodiment of the power distribution network fault detection device of the present invention, a second controller is further installed inside the housing. The signal input terminal of the second controller is electrically connected to the signal output terminal of the flaw detector through the wire, and the signal output terminal of the second controller is electrically connected to the electric push rod through the wire.

[0013] As an optional embodiment of the power distribution network fault detection device of the present invention, wherein: a bucket shovel is rotatably inserted at the end of the housing, the bucket shovel includes an upper shovel blade and a lower shovel blade hinged to the upper shovel blade, a limit ring is provided at one end of the bucket shovel located inside the housing, a sleeve is installed on the side of the limit ring, the number of sleeves is set to several, an insert is slidably inserted inside the sleeve, the end of the insert is connected to the bucket shovel, a spring is provided inside the sleeve and the insert, and the two ends of the spring are respectively connected to the limit ring and the bucket shovel.

[0014] As an optional embodiment of the power distribution network fault detection device described in this invention, the outer side of the bucket is fitted with a toothed ring, and both the limiting ring and the toothed ring are composed of upper and lower parts, and the openings of the limiting ring, the toothed ring, and the bucket are on the same horizontal plane as the opening of the shell.

[0015] As an optional embodiment of the power distribution network fault detection device of the present invention, a rotating shaft is rotatably provided inside the housing, and a third gear is installed at one end of the rotating shaft near the gear ring, the third gear intermittently meshing with the gear ring.

[0016] As an optional embodiment of the power distribution network fault detection device of the present invention, wherein: a first pulley is installed in the middle of the output shaft of the first motor, a second pulley is installed at one end of the shaft near the second gear, and a conveyor belt is sleeved between the first pulley and the second pulley.

[0017] The present invention has the following beneficial effects:

[0018] 1. In this power distribution network fault detection device, the first motor drives the housing to move along the cable. The detector head of the flaw detector detects faults in the cable that the housing passes through. When a fault is detected, the second motor drives the first drum to rotate, so that the complete tape rotates to the top of the cable. Then, the electric push rod drives the arc blade to press down, cutting off the middle part of the tape and sticking it on the cable, thereby marking the presence of a fault in the cable. In summary, this device facilitates the quick location and marking of cable faults, thereby improving the efficiency of cable flaw detection.

[0019] 2. This power distribution network fault detection device uses a first motor to drive a first pulley to rotate, which in turn drives a second pulley to rotate via a conveyor belt. The second pulley then drives a third gear to rotate via a shaft. The engagement of the third gear with the gear ring causes the limit ring and the bucket to rotate. The bucket rotates as the housing moves, thus scraping away dust and other debris adhering to the cable surface. This not only reduces the load on the cable but also minimizes the impact of dust on the adhesiveness of the tape, allowing the tape to adhere more firmly to the fault location on the cable, thereby further improving the efficiency of fault detection.

[0020] 3. In this power distribution network fault detection device, the flaw detector sends a fault signal to the first controller. The first controller first stops the rotation of the first motor, causing the housing to stop moving. Then, the first controller controls the rotation of the second motor to rotate the complete tape above the cable. Finally, the flaw detector sends a signal to the second controller, which controls the electric push rod to drive the arc blade downward to cut and stick the tape onto the cable. After completing one fault detection and marking, the device returns to its original position, and the housing moves along the cable again. In summary, it is easy to control the rotation of the second motor and the extension and retraction of the electric push rod, thus facilitating the sticking of tape to the cable fault location for marking, so that maintenance personnel can quickly find the fault location for repair. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the internal three-dimensional structure of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 3 This is a schematic diagram of the detection cable structure of the present invention.

[0024] Figure 4 This is a partial exploded view of the structure of the present invention.

[0025] Figure 5 This is a schematic diagram of a partial cross-sectional structure of the present invention.

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the bucket shovel of the present invention.

[0027] Figure 7 This is a schematic diagram of the third gear and gear ring separation structure of the present invention.

[0028] Figure 8 This is a schematic diagram of the flaw detector structure of the present invention.

[0029] Figure 9 This is the circuit diagram of the present invention.

[0030] In the diagram: 100, housing; 101, upper housing; 102, lower housing; 103, fastener; 110, first drive wheel; 120, second drive wheel; 121, first driven wheel; 122, second driven wheel; 130, first motor; 140, battery; 141, first gear; 142, second gear; 143, wire; 150, flaw detector; 160, probe head; 170, retaining ring; 171, upper half ring; 172, lower half ring; 180, first drum; 190. Second drum; 200. Conveyor belt; 210. Second motor; 220. Arc blade; 230. Electric actuator; 231. First controller; 232. Second controller; 240. Bucket shovel; 241. Upper blade; 242. Lower blade; 243. Limiting ring; 244. Sleeve; 245. Insert sleeve; 246. Spring; 250. Gear ring; 251. Rotating shaft; 252. Third gear; 253. First pulley; 254. Second pulley; 255. Conveyor belt. Detailed Implementation

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] Example 1 aims to address the problem that existing technologies for cable flaw detection in power distribution networks typically require personnel to use handheld cable flaw detectors for close-range scanning to determine if the cable insulation layer has cracks or damage. However, this is inconvenient for detecting flaws in cables at heights, thus easily affecting the efficiency of cable flaw detection. Please refer to [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 8 and Figure 9 A power distribution network fault detection device includes a housing 100.

[0033] The housing 100 includes an upper housing 101 and a lower housing 102 rotatably connected to the upper housing 101. A fastener 103 is provided between the upper housing 101 and the lower housing 102 to fix the upper housing 101 and the lower housing 102. The fastener 103 is configured to be used with a bolt and nut to facilitate attaching the housing 100 to the cable to be detected. A first drive wheel 110 and a second drive wheel 120 are rotatably disposed inside the housing 100. The first drive wheel 110 is rotatably disposed inside the upper housing 101 via a bearing, and the second drive wheel 120 is rotatably disposed inside the lower housing 102. A first driven wheel 121 is also rotatably disposed inside the upper housing 101, and a second driven wheel 122 is also rotatably disposed inside the lower housing 102. The first drive wheel 110 and the first driven wheel 121 abut against the upper side of the cable to be detected, and the second drive wheel 120 and the second driven wheel 122 abut against the lower side of the cable to be detected, thereby making the housing 100 more balanced when it is fitted onto the cable.

[0034] The housing 100 contains a first motor 130 for driving the second drive wheel 120. A battery 140 is installed inside the housing 100. A first gear 141 is coaxially mounted on the first drive wheel 110. The output shaft of the first motor 130 is connected to the second drive wheel 120. A second gear 142 is interference-fitted in the middle of the output shaft of the first motor 130. The first gear 141 and the second gear 142 mesh. The battery 140 is located on the side away from the first motor 130. A wire 143 is electrically connected to the outside of the first motor 130. The end of the wire 143 is electrically connected to the battery 140. The first motor 130 and the battery 140 are respectively located on both sides of the lower housing 102, so that the center of the housing 100 is lower and the weight is balanced on both sides, thereby further improving the balance of the housing 100 when moving on the cable.

[0035] A flaw detector 150 is installed inside the housing 100. The flaw detector 150 is electrically connected to a probe head 160. A fixing ring 170 is installed inside the housing 100. The probe head 160 is inserted into the side of the fixing ring 170. The number of probe heads 160 is set to several. The several probe heads 160 are evenly inserted into the side of the fixing ring 170 in a circumferential direction. The several probe heads 160 are connected in series with the flaw detector 150 via wires 143. The fixing ring 170 includes an upper half ring 171 and a lower half ring 172 hinged to the upper half ring 171. The upper half ring 171 is fixedly connected to the inner wall of the upper housing 101, and the lower half ring 172 is fixedly connected to the inner wall of the lower housing 102. The fixing ring 170 is sleeved on the outside of the cable to be inspected, so that the probe head 160 is close to the insulation layer of the cable surface.

[0036] The flaw detector 150 is configured as an ultrasonic flaw detector, which is a commonly used device in cable flaw detection. Its principle is mainly based on the propagation and reflection characteristics of ultrasonic waves in a medium. The generation and reception of ultrasonic waves: The ultrasonic flaw detector generates an excitation electrical signal through a circuit, which is transmitted to a crystal with piezoelectric effect, such as quartz or lithium sulfate, causing it to vibrate and generate ultrasonic waves. When the ultrasonic waves encounter defects such as cracks or breaks in the cable, they will be reflected. The reflected ultrasonic waves are received again by the piezoelectric crystal and converted into electrical signals for processing. After the received reflected wave signal is processed by the signal processing circuit, it will form an image or waveform displayed on the flaw detector. Based on the shape, position and other information of the waveform, it is possible to determine whether there are defects in the cable and the location and size of the defects. This is a conventional technical method and will not be elaborated here.

[0037] The housing 100 has a first drum 180 and a second drum 190 rotatably mounted inside. A tape 200 is provided between the first drum 180 and the second drum 190. A second motor 210 is installed inside the housing 100 and is connected to the first drum 180 for transmission. An arc blade 220 is provided above the tape 200. An electric push rod 230 is installed on the outside of the housing 100. The telescopic end of the electric push rod 230 is inserted into the side of the housing 100 and is fixedly connected to the arc blade 220.

[0038] In this embodiment: the first motor 130 drives the second drive wheel 120 and the second gear 142 to rotate. Through the meshing of the second gear 142 and the first gear 141, the first gear 141 drives the first drive wheel 110 to rotate, so that the first drive wheel 110 and the second drive wheel 120 simultaneously abut against the upper and lower sides of the cable and rotate, thereby causing the housing 100 to move along the cable.

[0039] Meanwhile, the probe head 160 of the flaw detector 150 detects cracks or damage to the cable through which the housing 100 passes. When a fault is detected, the second motor 210 drives the first drum 180 to rotate, causing the complete tape 200 to rotate above the cable. Subsequently, the electric push rod 230 drives the arc blade 220 to press down, cutting off the middle part of the tape 200 and sticking it to the cable, thus marking the cable fault. In summary, this facilitates the quick location and marking of cable faults, thereby improving the efficiency of cable flaw detection. It also addresses the problem that existing technologies for flaw detection of cables in power distribution networks typically require workers to use handheld cable flaw detectors to scan the cables at close range to determine if there are cracks or damage to the cable insulation layer. However, this is not convenient for flaw detection of cables at high locations, which can easily affect the efficiency of cable flaw detection.

[0040] Example 2 aims to address the problem that dust and other debris easily accumulate on the cable surface, increasing the cable's load and reducing the adhesion of the tape 200, making it difficult to firmly adhere the tape 200 to the cable and thus hindering the marking of cable faults. This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 A bucket shovel 240 is rotatably inserted into the end of the housing 100. The bucket shovel 240 includes an upper shovel blade 241 and a lower shovel blade 242 hinged to the upper shovel blade 241. A limit ring 243 is provided at one end of the bucket shovel 240 located inside the housing 100. A sleeve 244 is fixedly installed on the side of the limit ring 243. The number of sleeves 244 is set to several. An insert 245 is slidably inserted into the inner side of the sleeve 244. The end of the insert 245 is fixedly connected to the bucket shovel 240. A spring 246 is provided inside the sleeve 244 and the insert 245. The two ends of the spring 246 are fixedly connected to the limit ring 243 and the bucket shovel 240, respectively.

[0041] A toothed ring 250 is fixedly sleeved on the outside of the bucket shovel 240. Both the limiting ring 243 and the toothed ring 250 are composed of upper and lower parts. The openings of the limiting ring 243, the toothed ring 250, and the bucket shovel 240 are on the same horizontal plane as the opening of the housing 100. A rotating shaft 251 is rotatably arranged inside the housing 100. A third gear 252 is fixedly installed at one end of the rotating shaft 251 near the toothed ring 250. The third gear 252 intermittently meshes with the toothed ring 250.

[0042] A first pulley 253 is fixedly installed in the middle of the output shaft of the first motor 130, and a second pulley 254 is fixedly installed at one end of the shaft 251 near the second gear 142. A conveyor belt 255 is sleeved between the first pulley 253 and the second pulley 254.

[0043] In this embodiment: when the first motor 130 drives the housing 100 to move along the cable, the end of the bucket 240 wraps around and adheres to the surface of the cable. The first motor 130 also drives the first pulley 253 to rotate, and then drives the second pulley 254 to rotate through the conveyor belt 255. The second pulley 254 drives the third gear 252 to rotate through the rotating shaft 251. Through the meshing of the third gear 252 with the gear ring 250, the limiting ring 243 and the bucket 240 are driven to rotate. The bucket 240 rotates while moving with the housing 100, thereby scraping off the dust and other debris attached to the surface of the cable. This not only reduces the load on the cable, but also minimizes the impact of dust on the adhesiveness of the tape 200, making it easier for the tape 200 to adhere more firmly to the fault location of the cable, thereby further improving the efficiency of fault detection.

[0044] It should be noted that when the detection is completed and the housing 100 needs to be removed from the cable, if the opening of the bucket shovel 240 does not coincide with the opening of the housing 100, it will be difficult to separate the upper housing 101 and the lower housing 102. In this case, hold the bucket shovel 240 and pull it outward. The insert 245 will slide out of the sleeve 244, and the spring 246 will be stretched. Then, the toothed ring 250 will move away from the third gear 252 along with the bucket shovel 240 until the toothed ring 250 and the third gear 252 are disengaged. Then, the bucket shovel 240 can be manually rotated so that the opening of the bucket shovel 240 and the opening of the housing 100 are on the same horizontal plane, that is, the opening of the bucket shovel 240 coincides with the opening of the housing 100. Then the upper housing 101 and the lower housing 102 can be separated, which makes it easier to remove the housing 100 from the cable.

[0045] Example 3 aims to address the problem of difficulty in controlling the rotation of the second motor 210 and the extension / retraction of the electric push rod 230, thus hindering the application of tape 200 to the cable fault. This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 and Figure 9 A first controller 231 is installed inside the housing 100. The first controller 231 is configured as a motor controller. The signal input terminal of the first controller 231 is electrically connected to the signal output terminal of the flaw detector 150 through a wire 143. The signal output terminal of the first controller 231 is electrically connected to the first motor 130 and the second motor 210 through wires 143 respectively.

[0046] A second controller 232 is also installed inside the housing 100. The second controller 232 is set as an electric lifting rod controller. The signal input terminal of the second controller 232 is electrically connected to the signal output terminal of the flaw detector 150 through a wire 143. The signal output terminal of the second controller 232 is electrically connected to the electric push rod 230 through a wire 143. The motor controller controls the rotation of the output shafts of the first motor 130 and the second motor 210. The electric lifting rod controller controls the extension and retraction of the extension end of the electric push rod 230.

[0047] In this embodiment: When the flaw detector 150 detects a cable fault, it sends a fault signal to the first controller 231 via wire 143. The first controller 231 then controls the first motor 130 to stop rotating, causing the housing 100 to stop moving. Next, the first controller 231 controls the second motor 210 to rotate, moving the complete tape 200 above the cable. Finally, the flaw detector 150 sends a signal to the second controller 232, which controls the electric push rod 230 to drive the arc blade 220 downward to cut and stick the tape 200 onto the cable. After completing one fault detection and marking, the equipment is restored, and the housing 100 moves along the cable again. In summary, it is convenient to control the rotation of the second motor 210 and the extension and retraction of the electric push rod 230, thereby facilitating the sticking of the tape 200 to the cable fault location for marking, so that maintenance personnel can quickly find the fault location for repair.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A power distribution network fault detection device, comprising a housing (100), a first drive wheel (110) and a second drive wheel (120) rotatably disposed within the housing (100), a first motor (130) for driving the second drive wheel (120) disposed within the housing (100), a storage battery (140) installed within the housing (100), and a flaw detector (150) installed within the housing (100), the flaw detector (150) being electrically connected to a probe (160), characterized in that: A fixing ring (170) is installed inside the housing (100), and a probe (160) is inserted into the side of the fixing ring (170). A first drum (180) and a second drum (190) are rotatably arranged inside the housing (100). A tape (200) is arranged between the first drum (180) and the second drum (190). A second motor (210) is installed inside the housing (100) and is connected to the first drum (180) for transmission. An arc blade (220) is arranged above the tape (200). An electric push rod (230) is installed on the outside of the housing (100). The telescopic end of the electric push rod (230) is inserted into the side of the housing (100) and connected to the arc blade (220). A bucket shovel (240) is rotatably inserted at the end of the housing (100). A toothed ring (250) is fitted on the outside of the bucket shovel (240). A rotating shaft (251) is rotatably arranged on the inside of the housing (100). A third gear (252) is installed at one end of the rotating shaft (251) near the toothed ring (250). The third gear (252) intermittently meshes with the toothed ring (250).

2. The power distribution network fault detection device according to claim 1, characterized in that: The housing (100) includes an upper housing (101) and a lower housing (102) rotatably connected to the upper housing (101). A fastener (103) is provided between the upper housing (101) and the lower housing (102). The fastener (103) is used to fix the upper housing (101) and the lower housing (102). A first drive wheel (110) is rotatably disposed in the upper housing (101), and a second drive wheel (120) is rotatably disposed in the lower housing (102). The upper shell (101) is rotatably provided with a first driven wheel (121), and the lower shell (102) is rotatably provided with a second driven wheel (122). The first drive wheel (110) and the first driven wheel (121) abut against the upper side of the cable to be detected, and the second drive wheel (120) and the second driven wheel (122) abut against the lower side of the cable to be detected.

3. The power distribution network fault detection device according to claim 1, characterized in that: The first drive wheel (110) is coaxially mounted with a first gear (141). The output shaft of the first motor (130) is connected to the second drive wheel (120) for transmission. The output shaft of the first motor (130) is fitted with a second gear (142). The first gear (141) meshes with the second gear (142). The battery (140) is located on the side away from the first motor (130). The outside of the first motor (130) is electrically connected with a wire (143). The end of the wire (143) is electrically connected to the battery (140).

4. The power distribution network fault detection device according to claim 2, characterized in that: The number of probes (160) is set to several. Several probes (160) are evenly inserted in the circumferential direction on the side of the fixed ring (170). Several probes (160) are connected in series through wires (143) and then electrically connected to the flaw detector (150). The fixed ring (170) includes an upper half ring (171) and a lower half ring (172) hinged to the upper half ring (171). The upper half ring (171) is connected to the inner wall of the upper shell (101), and the lower half ring (172) is connected to the inner wall of the lower shell (102). The fixed ring (170) is sleeved on the outside of the cable to be tested.

5. A power distribution network fault detection device according to claim 1, characterized in that: A first controller (231) is installed inside the housing (100). The signal input terminal of the first controller (231) is electrically connected to the signal output terminal of the flaw detector (150) via a wire (143). The signal output terminal of the first controller (231) is electrically connected to the first motor (130) and the second motor (210) via wires (143).

6. The power distribution network fault detection device according to claim 1, characterized in that: A second controller (232) is also installed inside the housing (100). The signal input terminal of the second controller (232) is electrically connected to the signal output terminal of the flaw detector (150) via a wire (143). The signal output terminal of the second controller (232) is electrically connected to the electric push rod (230) via a wire (143).

7. The power distribution network fault detection device according to claim 1, characterized in that: The bucket shovel (240) includes an upper shovel blade (241) and a lower shovel blade (242) hinged to the upper shovel blade (241). A limit ring (243) is provided at one end of the bucket shovel (240) located in the housing (100). A sleeve (244) is installed on the side of the limit ring (243). The number of sleeves (244) is set to several. A plug (245) is slidably inserted into the inner side of the sleeve (244). The end of the plug (245) is connected to the bucket shovel (240). A spring (246) is provided inside the sleeve (244) and the plug (245). The two ends of the spring (246) are connected to the limit ring (243) and the bucket shovel (240) respectively.

8. A power distribution network fault detection device according to claim 7, characterized in that: The limiting ring (243) and the toothed ring (250) are both composed of upper and lower parts, and the openings of the limiting ring (243), the toothed ring (250), and the bucket (240) are on the same horizontal plane as the opening of the shell (100).

9. A power distribution network fault detection device according to claim 1, characterized in that: A first pulley (253) is installed in the middle of the output shaft of the first motor (130), and a second pulley (254) is installed at one end of the shaft (251) near the second gear (142). A conveyor belt (255) is fitted together between the first pulley (253) and the second pulley (254).

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