Power distribution network fault section positioning method and device

Abstract

The invention discloses a power distribution network fault section positioning method and device.The power distribution network fault section positioning device comprises an upper shell, a lower shell, a magnetic field imager and a high-frequency current sensor, a servo motor is installed on the lower shell, and a driving wheel is fixed to a motor shaft of the servo motor; a first fan-shaped seat is arranged at one end of the upper shell, a second fan-shaped seat is arranged at one end of the lower shell, brush plates are slidably connected to the second fan-shaped seat and the first fan-shaped seat respectively, an abutting frame is slidably connected to the upper shell, a first wedge block is fixed to one brush plate, and a second wedge block is fixed to the other brush plate. The abutting frame abuts against the first wedge block. And during cleaning, a cleaning agent can be quantitatively sprayed on the surface of the cable, so that the impurity removal effect is improved, the influence of impurities on the high-frequency current sensor and the influence of a magnetic field imager on cable detection are reduced, and the cable detection and fault positioning precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution networks, and specifically to a method and device for locating fault sections of a distribution network. Background Art

[0002] As the power users' requirements for power supply quality are getting higher and higher, the distribution network, as the part directly connected to users in the power system, its power supply reliability has also been increasingly valued by users. Once a fault occurs in the distribution network, as the power outage range expands and the power outage time prolongs, the national economic losses will also increase accordingly. Therefore, when a fault occurs in the distribution network, it is crucial to ensure that the power outage range and time are minimized to the greatest extent, and it is necessary to perform fault location detection on the cables in the distribution network sections.

[0003] When a fault occurs in a distribution network section, it is necessary to use a non-contact positioning detection device to detect the cables in the fault section of the distribution network in order to locate the fault point, determine that the cables may be faulty, and facilitate the precise repair by power workers, thereby restoring the operation of the power. Currently, the cables in the distribution network sections are erected outdoors and have a certain height from the ground. Over time, impurities such as dust and bird droppings are likely to adhere to the surface, which is inconvenient for cleaning. As a result, the non-contact positioning detection device is easily interfered by impurities during the detection process, thereby reducing the detection accuracy and affecting the fault location efficiency. Summary of the Invention

[0004] The present invention provides a device for locating fault sections of a distribution network, which has the beneficial effect of being able to quantitatively spray a cleaning agent onto the surface of the cable, improving the effect of removing impurities, reducing the influence of impurities on the detection of the cable by the high-frequency current sensor and the magnetic field imager, and improving the accuracy of cable detection and fault location, and solves the problem mentioned in the above background art that impurities such as dust and bird droppings are likely to adhere to the surface of the cable, which is inconvenient for cleaning, so that the non-contact positioning detection device is easily interfered by impurities during the detection process, thereby reducing the detection accuracy and affecting the fault location efficiency.

[0005] The present invention provides the following technical solution: A device for locating fault sections of a distribution network includes an upper housing, a lower housing, a magnetic field imager, and a high-frequency current sensor. A servo motor is installed on the lower housing, and a driving wheel is fixed on the motor shaft of the servo motor. One end of the upper housing is provided with a first sector seat, and one end of the lower housing is provided with a second sector seat. Brush plates are respectively slidably connected to the second sector seat and the first sector seat. A contact frame is slidably connected to the upper housing. A first wedge block is fixed on one of the brush plates, and the contact frame abuts against the first wedge block. The upper housing is provided with a spraying assembly, and one end of the spraying assembly is connected to the contact frame.

[0006] As an optional solution of the distribution network fault section positioning device of the present invention, wherein: the spray assembly includes a water tank, the water tank is fixed on the upper shell, and the water outlet at the lower end of the water tank is connected to a piston cylinder, a first piston plate is slidably connected in the piston cylinder, a first piston rod is installed on the first piston plate, the first piston rod is slidably connected to the upper shell, and one end of the first piston rod is fixedly connected to the abutment frame, a plurality of nozzles are fixed on the first sector seat, and the water outlet of the piston cylinder is connected to the nozzle through a conduit; The magnetic field imager and the high-frequency current sensor are both mounted on the lower shell, one side of the lower shell is rotatably connected to a driven wheel, telescopic rods are symmetrically arranged on the upper shell, the telescopic rods are rotatably connected to guide wheels, a first connecting rod is rotatably connected between the abutment frame and one of the guide wheels, a first spring is connected between one of the brush plates and the second fan-shaped seat, a seventh spring is connected between the other brush plate and the first fan-shaped seat, and a counterweight is installed on the lower shell.

[0007] As an optional solution of the distribution network fault section positioning device described in the present invention, wherein: a first cleaning seat is fixed on the lower shell body, a first sliding bracket is fixed on the first cleaning seat, and a first hollow plate is arranged in the first cleaning seat, the first sliding bracket is elastically connected to the first hollow plate via a second spring, a second cleaning seat is fixed on the upper shell body, a second sliding bracket is fixed on the second cleaning seat, and a second hollow plate is arranged in the second cleaning seat, the second sliding bracket is elastically connected to the second hollow plate via a third spring, a hollow tube is arranged at the lower end of the second hollow plate, the hollow tube is inserted into the first hollow plate, and sponge cleaning blocks are installed on both the first hollow plate and the second hollow plate.

[0008] As an optional solution of the distribution network fault section positioning device described in the present invention, one side of the first cleaning seat is slidably connected with a mounting block, one end of the mounting block is fixedly connected to the first hollow plate, and a second connecting rod is rotatably connected between the mounting block and the driving wheel.

[0009] As an optional solution of the distribution network fault section locating device described in the present invention, wherein: a first extrusion plate is arranged in the first cleaning seat, and the first extrusion plate is elastically connected to the first sliding bracket through a fourth spring; a second extrusion plate is arranged in the second cleaning seat, and the second extrusion plate is elastically connected to the second sliding bracket through a fifth spring, and the lower end of the second extrusion plate is inserted into the first extrusion plate.

[0010] As an optional solution to the distribution network fault section locating device described in the present invention, wherein: a first contact bar is arranged on the second extrusion plate, the first contact bar is slidably connected to the second cleaning seat, and a third wedge block is slidably connected to the contact frame, and the third wedge block is elastically connected to the contact frame through a sixth spring.

[0011] As an optional solution of the distribution network fault section locating device described in the present invention, wherein: both sides of the second extrusion plate are rotatably connected with a rotating rod, a third extrusion plate is fixed on the rotating rod, the third extrusion plate is fixed on the rotating rod, a first torsion spring is installed between the rotating rod and the second extrusion plate, a fourth wedge is fixed on the third extrusion plate, and second interference strips are fixed on both sides of the second hollow plate.

[0012] As an optional scheme of the distribution network fault section locating device described in the present invention, wherein: a plurality of water absorption holes are opened on the side surfaces of the first hollow plate and the second hollow plate, and a water absorption seat is fixed to the lower end of the first cleaning seat, the water inlet of the water absorption seat is connected with the water outlet at the lower end of the first hollow plate through a pipeline, an inlet valve plate is rotatably connected to the water inlet of the water absorption seat, and an outlet valve plate is rotatably connected to the water outlet of the water absorption seat, the inlet valve plate and the outlet valve plate are elastically connected to the water absorption seat through a second torsion spring, and an arc-shaped sealing strip is installed on one side of the first hollow plate and the second hollow plate.

[0013] As an optional solution of the distribution network fault section locating device described in the present invention, a second piston plate is slidably connected to the water absorption seat, a second piston rod is connected to the second piston plate, and a connecting bracket is connected between the second piston rod and the mounting block.

[0014] The method for locating a fault section of a distribution network includes the following specific steps: Step 1: Installation of the positioning device: The staff deploys a positioning device in each distribution network section and manually installs the positioning device on the cable in the distribution network section; Step 2: Preliminary detection: When the distribution network background collects a fault signal of a distribution network section, the positioning device is driven to move on the cable when a fault occurs, and the high-frequency current sensor set in the positioning device is used to perform non-contact scanning of the cable in the fault section of the distribution network to detect whether there is a high-frequency current signal. If an abnormal signal is detected, it is preliminarily determined that the cable may be faulty. Step 3: Locate the fault area. In the area where the abnormal signal is initially detected, use the magnetic field imager in the positioning device to scan the magnetic field distribution around the cable, and further narrow the fault area by analyzing the changes in the magnetic field distribution. Step 4: Accurately locate the fault point, combining the frequency and amplitude of the fault signal provided by the high-frequency current sensor and the spatial position of the fault point provided by the magnetic field imager to determine the exact position of the fault point; Step 5: Fault analysis: determine the fault type based on the waveform characteristics of the high-frequency current signal and the changes in the magnetic field distribution. The fault types include partial discharge, short circuit fault and ground fault.

[0015] The present invention has the following beneficial effects:

[0016] 1. In the fault section positioning device of the distribution network, the magnetic field imager and the high-frequency current sensor can be installed in the lower shell, and the driving wheel and the driven wheel in the lower shell can be attached to the surface of the cable. When the upper shell is connected to the lower shell by screws, the guide wheels on the two telescopic rods can be attached to the cable by the cooperation with the driving wheel and the driven wheel. When the servo motor drives the driving wheel to rotate, the device can be moved on the cable. During the movement, the cable is non-contact scanned by the cooperation of the high-frequency current sensor and the magnetic field imager, and the precise position of the fault point can be determined; When the brush plates slidingly connected on the second fan-shaped seat and the first fan-shaped seat come into contact with the cable surface, the purpose of cleaning the impurities on the cable surface can be achieved. The guide wheel and the contact frame can be connected by the first connecting rod, so that the contact frame can move horizontally and contact the first wedge block on the brush plate, prompting the two brush plates to rotate reciprocatingly in a circle, thereby improving the cleaning effect of the cable impurities. At the same time, the contact frame drives the spraying assembly to work, and can spray the cleaning agent onto the surface of the cable in a quantitative manner, thereby improving the effect of impurity removal, reducing the influence of impurities on the high-frequency current sensor and the magnetic field imager on the cable detection, and improving the accuracy of cable detection and fault location.

[0017] 2. In the fault section positioning device of the distribution network, when the first cleaning seat provided in the lower shell and the second cleaning seat provided in the upper shell fit together, the second hollow plate can be inserted into the first hollow plate through the hollow tube, and the sponge cleaning blocks installed on the first hollow plate and the second hollow plate can fit on the surface of the cable. When the device moves, the stains and sewage on the surface can be cleaned and adsorbed to avoid affecting the accuracy of the cable positioning scan. The second connecting rod connected between the mounting block and the driving wheel can drive the mounting block to reciprocate when the driving wheel rotates, so that the sponge cleaning block can reciprocate on the surface of the cable, further improving the cleaning effect of impurities and sewage on the cable. When the second extrusion plate and the first extrusion plate are engaged with each other, they can contact the reciprocating sponge cleaning block, squeeze the sewage in the sponge cleaning block, reduce the amount of sewage attached, and improve the cleaning effect of the sponge cleaning block; During the return process of the friction frame, the third wedge block can be driven to collide with the first friction strip on the second extrusion plate, driving the second extrusion plate and the first extrusion plate to actively squeeze the sponge cleaning block, thereby improving the squeezing effect; through the cooperation of the second friction strip, the third extrusion plate and the fourth wedge block, when the second hollow plate approaches the second extrusion plate, the two third extrusion plates are deflected to squeeze both sides of the sponge cleaning block, thereby further improving the squeezing effect on sewage.

[0018] 3. In the fault section positioning device of the distribution network, the water absorption holes arranged in the first hollow plate and the second hollow plate facilitate the sponge cleaning block to squeeze a part of the sewage to flow into the first hollow plate and the second hollow plate, and the arc-shaped sealing strip contacts the cable to prevent the squeezed sewage from adhering to the cable surface again and affecting the operation of the high-frequency current sensor and the magnetic field imager. The arranged water absorption seat is connected with the second hollow plate through a pipeline. When the mounting block moves back and forth, the second piston rod and the second piston sheet can be driven to reciprocate in the water absorption seat through the connecting bracket, and the sponge cleaning block When squeezed, when the second piston piece moves in the direction away from the water outlet on the water absorption seat, an adsorption force can be generated to close the outlet valve plate and open the inlet valve plate, thereby transmitting the adsorption force to the water absorption holes of the second hollow plate and the first hollow plate through the pipeline, and the moisture in the sponge cleaning block can be adsorbed into the water absorption seat, so that the sponge cleaning block can be used for diversion and adsorption of sewage when squeezed, thereby preventing sewage from overflowing onto the cable surface; when the second piston piece is reset, the sewage can be pushed to move on the water absorption seat, the inlet valve plate is closed due to the resistance of water, and the outlet valve plate is opened, so that the sewage is discharged from the water absorption seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a structural cross-sectional view of the present invention.

[0021] Figure 3 It is a schematic diagram of the internal structure of the lower shell of the present invention.

[0022] Figure 4 This is one of the structural schematic diagrams of the first cleaning seat and the second cleaning seat of the present invention.

[0023] Figure 5 This is the second structural schematic diagram of the first cleaning seat and the second cleaning seat of the present invention.

[0024] Figure 6 It is a schematic diagram of the internal structure of the first cleaning seat and the second cleaning seat of the present invention.

[0025] Figure 7 for Figure 3 A partial enlarged schematic diagram in the middle.

[0026] Figure 8 is Figure 5 The partial enlarged schematic view at position B in

[0027] Figure 9 The schematic diagram of the second extrusion plate and the third extrusion plate of the present invention.

[0028] Figure 10 The schematic diagram of the first hollow plate and the second hollow plate of the present invention.

[0029] Figure 11 The schematic diagram of the water absorption seat of the present invention.

[0030] Figure 12 The schematic diagram of the telescopic rod of the present invention.

[0031] Figure 13 The flow chart of the method for locating the fault section of the distribution network.

[0032] In the figure: 1. High-frequency current sensor; 2. Magnetic field imager; 3. Upper housing; 4. Lower housing; 5. Driving wheel; 6. Seventh spring; 7. Servo motor; 8. Driven wheel; 9. Telescopic rod; 10. Guide wheel; 11. First sector seat; 111. Water tank; 112. Piston cylinder; 113. First piston piece; 114. First piston rod; 115. Sprayer; 12. Second sector seat; 13. Brush plate; 14. Contact frame; 15. First wedge block; 16. First spring; 17. First connecting rod; 18. First cleaning seat; 181. First sliding bracket; 19. First hollow plate; 20. Second spring; 21. Second cleaning seat; 22. Second sliding bracket; 23. Second hollow plate; 231. Hollow tube; 24. Third spring; 25. Sponge cleaning block; 26. Mounting block; 27. Second connecting rod; 28. First extrusion plate; 29. Fourth spring; 30. Second extrusion plate; 301. Fifth spring; 31. First contact strip; 32. Three-wedge block; 33. Sixth spring; 34. Rotating rod; 35. Third extrusion plate; 36. First torsion spring; 37. Fourth wedge block; 38. Second contact strip; 39. Water absorption seat; 40. Inlet valve plate; 41. Outlet valve plate; 42. Arc-shaped sealing strip; 43. Second piston piece; 44. Second piston rod; 45. Connecting bracket; 46. Counterweight block. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Example 1, please refer toFigures 1 to 13 , a distribution network fault section positioning device, comprising an upper shell 3, a lower shell 4, a magnetic field imager 2 and a high-frequency current sensor 1, a servo motor 7 is installed on the lower shell 4, and a driving wheel 5 is fixed on the motor shaft of the servo motor 7; A first fan-shaped seat 11 is provided at one end of the upper shell 3, and a second fan-shaped seat 12 is provided at one end of the lower shell 4. Brush plates 13 are slidably connected to the second fan-shaped seat 12 and the first fan-shaped seat 11 respectively. A resistance frame 14 is slidably connected to the upper shell 3, and a first wedge block 15 is fixed on one of the brush plates 13. The resistance frame 14 resists against the first wedge block 15. A spray assembly is provided on the upper shell 3, and one end of the spray assembly is connected to the resistance frame 14.

[0035] The spray assembly includes a water tank 111, which is fixed on the upper shell 3, and a piston cylinder 112 is connected to the water outlet at the lower end of the water tank 111, a first piston plate 113 is slidably connected in the piston cylinder 112, a first piston rod 114 is installed on the first piston plate 113, the first piston rod 114 is slidably connected to the upper shell 3, and one end of the first piston rod 113 is fixedly connected to the abutment frame 14, a plurality of spray heads 114 are fixed on the first sector seat 11, and the water outlet of the piston cylinder 113 is connected to the spray head 115 through a conduit; The magnetic field imager 2 and the high-frequency current sensor 1 are both installed on the lower shell 4, and a driven wheel 8 is rotatably connected to one side of the lower shell 4. Telescopic rods 9 are symmetrically arranged on the upper shell 3, and a guide wheel 10 is rotatably connected to the telescopic rod 9. A first connecting rod 17 is rotatably connected between the abutment frame 14 and one of the guide wheels 10, a first spring 16 is connected between one of the brush plates 13 and the second fan-shaped seat 12, and a seventh spring 6 is connected between the other brush plate 13 and the first fan-shaped seat 11, and a counterweight block 46 is installed on the lower shell 4.

[0036] When installing the positioning device, refer to Figures 1 - 3, attach both ends of the lower housing 4 to the cable so that the driving wheel 5 and the driven wheel 8 inside the lower housing 4 can be attached to the surface of the cable. At the same time, put the high-frequency current sensor 1 and the magnetic field imager 2 on the cable in sequence and install them on the lower housing 4. Then align the upper housing 3 with the lower housing 4 so that the guide wheels 10 on the two telescopic rods 9 are in close contact with the surface of the cable. Fix the upper housing 3 and the lower housing 4 with screws. At this time, the two guide wheels 10 are respectively opposite to the driving wheel 5 and the driven wheel 8, and the brush plates 13 of the second sector seat 12 and the first sector seat 11 are in mutual contact. When a fault occurs in the cable and needs to be located, start the servo motor 7. The servo motor 7 drives the driving wheel 5 to move horizontally on the cable, prompting the upper housing 3 and the lower housing 4 to move synchronously on the cable. During the movement, the cable is scanned non-contact through the cooperation of the high-frequency current sensor 1 and the magnetic field imager 2. Combining the frequency and amplitude of the fault signal provided by the high-frequency current sensor 1 and the spatial position of the fault point provided by the magnetic field imager 2, determine the exact position of the fault point and judge the type of the fault; During the movement of the device, refer to Figures 1 - 3 , when one of the guide wheels 10 rotates, it can drive the first connecting rod 17 to swing reciprocally, so that one end of the first connecting rod 17 drives the abutting frame 14 to move horizontally back and forth on the upper housing 3, prompting one end of the abutting frame 14 to abut against the first wedge block 15, making one of the brush plates 13 rotate circumferentially on the first sector seat 11, and the first spring 16 is in a state of storing energy. The two brush plates 13 are in mutual contact, making the other brush plate 13 rotate on the second sector seat 12, and the seventh spring 6 is in a state of storing energy, prompting the two brush plates 13 to rotate circumferentially and reciprocally, which can greatly improve the cleaning effect of the cable surface impurities. At the same time, the first piston rod 114 in the spraying assembly is fixedly connected to the abutting frame 14. When the cleaning agent in the water tank 111 flows into the piston cylinder 112, the first piston rod 114 drives the first piston piece 113 to move, squeezing the cleaning agent, and prompting a certain amount of cleaning agent to be transported to several nozzles 115 on the first sector seat 11 through the conduit to spray the surface of the cable. Through the cooperation of the two brush plates 13, improve the effect of removing impurities, reduce the influence of impurities on the detection of the cable by the high-frequency current sensor 1 and the magnetic field imager 2, and improve the accuracy of cable detection and fault location; Through the counterweight block 46 installed on the lower housing 4, the stability of the device moving on the cable can be maintained, and the position deviation can be reduced during the movement.

[0037] The telescopic rod 9 includes a first mounting rod, a spring and a second mounting rod. The first mounting rod is rotatably connected to one end of the guide wheel 10, the upper end of the second mounting rod is fixed on the upper shell 3, and the lower end of the second mounting rod is slidably connected to the first mounting rod. The two ends of the spring are fixedly connected to the first mounting rod and the second mounting rod respectively. When the upper shell 3 and the lower shell 4 are engaged, the guide wheel 10 on the first mounting rod contacts the surface of the cable. After the engagement of the upper shell 3 and the lower shell 4 is completed, the first mounting rod slides on the second mounting rod, and the spring is changed from an unstressed state to a compressed stressed state. Through the action of the spring, the guide wheel 10 can be pressed against the surface of the cable to prevent the cable from falling off from the guide wheel 10.

[0038] Embodiment 2: This embodiment is an improvement made on the basis of Embodiment 2. For details, please refer to Figures 1 to 13 A first cleaning seat 18 is fixed on the lower shell body 4, a first sliding bracket 181 is fixed on the first cleaning seat 18, and a first hollow plate 19 is arranged in the first cleaning seat 18, the first sliding bracket 181 is elastically connected to the first hollow plate 19 through a second spring 20, a second cleaning seat 21 is fixed on the upper shell body 3, a second sliding bracket 22 is fixed on the second cleaning seat 21, and a second hollow plate 23 is arranged in the second cleaning seat 21, the second sliding bracket 22 is elastically connected to the second hollow plate 23 through a third spring 24, a hollow tube 231 is arranged at the lower end of the second hollow plate 23, the hollow tube 231 is inserted into the first hollow plate 19, and sponge cleaning blocks 25 are installed on both the first hollow plate 19 and the second hollow plate 23.

[0039] A mounting block 26 is slidably connected to one side of the first cleaning seat 18 , one end of the mounting block 26 is fixedly connected to the first hollow plate 19 , and a second connecting rod 27 is rotatably connected between the mounting block 26 and the driving wheel 5 .

[0040] A first extrusion plate 28 is provided in the first cleaning seat 18, and the first extrusion plate 28 is elastically connected to the first sliding bracket 181 through a fourth spring 29. A second extrusion plate 30 is provided in the second cleaning seat 21, and the second extrusion plate 30 is elastically connected to the second sliding bracket 22 through a fifth spring 301. The lower end of the second extrusion plate 30 is inserted into the first extrusion plate 28.

[0041] The second extrusion plate 30 is provided with a first abutment bar 31 which is slidably connected to the second cleaning seat 21 , and the abutment frame 14 is slidably connected with a third wedge block 32 which is elastically connected to the abutment frame 14 via a sixth spring 33 .

[0042] Rotating rods 34 are rotatably connected to both sides of the second pressing plate 30. A third pressing plate 35 is fixed on the rotating rod 34. The third pressing plate 35 is fixed on the rotating rod 34. A first torsion spring 36 is installed between the rotating rod 34 and the second pressing plate 30. A fourth wedge block 37 is fixed on the third pressing plate 35. Second abutting strips 38 are fixed on both sides of the second hollow plate 23.

[0043] When the lower housing 4 is engaged with the upper housing 3, referring to Figures 2 - 6 , the first cleaning seat 18 and the second cleaning seat 21 are mutually attached. The second hollow plate 23 is inserted onto the first hollow plate 19 through the hollow tube 231. Both sponge cleaning blocks 25 are attached to the surface of the cable. When the driving wheel 5 drives the second connecting rod 27 to swing, the purpose of driving the mounting block 26 to slide on the first cleaning seat 18 by the second connecting rod 27 can be achieved. The second hollow plate 23 slides on the second sliding bracket 22, and the third spring 24 stores energy. The first hollow plate 19 slides on the first sliding bracket 181, and the second spring 20 stores energy, prompting the sponge cleaning blocks 25 on the second hollow plate 23 and the first hollow plate 19 to perform reciprocating motion on the surface of the cable. When the device moves, the stains and sewage on the surface of the cable can be efficiently cleaned, greatly reducing the stains and sewage on the surface of the cable; Referring to Figures 4 - 9 , when the first cleaning seat 18 and the second cleaning seat 21 are mutually attached, the lower end of the second pressing plate 30 is inserted onto the first pressing plate 28, making the second pressing plate 30 and the first pressing plate 28 form an integral body. Since the movement radius of the driving wheel 5 is larger than that of the guide wheel 10, the movement stroke of the first connecting rod 17 is smaller than that of the second connecting rod 27. When the sponge cleaning block 25 approaches the first pressing plate 28 and the second pressing plate 30 to squeeze water, at the same time, when the abutting frame 14 resets, the third wedge block 32 can be in contact with the first abutting strip 31, thereby pushing the second pressing plate 30 closer to the sponge cleaning block 25, making the second pressing plate 30 drive the first pressing plate 28 to move towards the sponge cleaning block 25, which can improve the squeezing effect on the water inside the sponge cleaning block 25. At the same time, when the second hollow plate 23 approaches the second pressing plate 30, the second abutting strip 38 can be in contact with the fourth wedge block 37 fixed on the third pressing plate 35, prompting the rotating rod 34 to deflect on the second pressing plate 30, and the first torsion spring 36 stores energy. When the third pressing plate 35 deflects, the purpose of squeezing both sides of the two sponge cleaning blocks 25 can be achieved, which can further improve the squeezing effect on the sewage and the cleaning effect of the sponge cleaning block 25 on the surface of the cable. When the second pressing plate 30 stops moving, the abutting frame 14 drives the third wedge block 32 to continue moving, making the contact force between the third wedge block 32 and the first abutting strip 31 increase, causing the third wedge block 32 to retract into the abutting frame 14, and the sixth spring 33 stores energy, achieving the disengagement between the third wedge block 32 and the first abutting strip 31, and the second pressing plate 30 resets.

[0044] Embodiment 3: This embodiment is an improvement made on the basis of Embodiment 2. For details, please refer to Figures 1 to 13 A plurality of water absorption holes are provided on the side surfaces of the first hollow plate 19 and the second hollow plate 23, and a water absorption seat 39 is fixed to the lower end of the first cleaning seat 18, the water inlet of the water absorption seat 39 is connected with the water outlet at the lower end of the first hollow plate 19 through a pipe, an inlet valve plate 40 is rotatably connected to the water inlet of the water absorption seat 39, and an outlet valve plate 41 is rotatably connected to the water outlet of the water absorption seat 39, the inlet valve plate 40 and the outlet valve plate 41 are elastically connected to the water absorption seat 39 through a second torsion spring, and an arc-shaped sealing strip 42 is installed on one side of the first hollow plate 19 and the second hollow plate 23.

[0045] A second piston plate 43 is slidably connected to the water absorption seat 39 , a second piston rod 44 is connected to the second piston plate 43 , and a connecting bracket 45 is connected between the second piston rod 44 and the mounting block 26 .

[0046] In order to avoid as much as possible the overflow of sewage when the sponge cleaning block 25 is squeezed and attached to the surface of the cleaned cable, refer to Figures 3 - 11 When the first hollow plate 19 and the second hollow plate 23 are fitted together, the installed arc-shaped sealing strip 42 is against the insulating surface of the cable. When the second connecting rod 27 drives the mounting block 26 to move horizontally, the first hollow plate 19 and the second hollow plate 23 drive the sponge cleaning block 25 to approach the second squeezing plate 30 and the third squeezing plate 35 for squeezing water. At this time, the mounting block 26 drives the second piston rod 44 and the second piston plate 43 to move horizontally in the water absorption seat 39 through the connecting bracket 45. The valve outlet plate 41 and the valve inlet plate 40 are rotatably connected to the water absorption seat 39 and are kept in a closed state through the cooperation of the second torsion spring. When the second piston plate 43 When it moves in the direction away from the water outlet of the water absorption seat 39, the adsorption force generated in the water absorption seat 39 can keep the outlet valve plate 41 closed and the inlet valve plate 40 open. The generated adsorption force is transmitted to the second hollow plate 23 and the first hollow plate 19 through the pipeline, and the moisture in the squeezed sponge cleaning block 25 is adsorbed into the water absorption seat 39 through a plurality of water absorption holes, so as to prevent water from overflowing onto the cable surface when the sponge cleaning block 25 is squeezed. When the second piston plate 43 is reset, it can push the sewage to move in the water absorption seat 39, the inlet valve plate 40 is closed due to the resistance of the water, and the outlet valve plate 41 is opened, so that the sewage is quickly discharged from the water absorption seat 39.

[0047] Example 4, please refer to Figures 1 to 13 , a method for locating a fault section of a distribution network includes the following specific steps: Step 1: Installation of the positioning device: The staff deploys a positioning device in each distribution network section and manually installs the positioning device on the cable in the distribution network section; Step 2: Preliminary detection. When the background of the distribution network collects the fault signal of a certain distribution network section, the positioning device is driven. When a fault occurs, the positioning device is driven to move on the cable, and the high-frequency current sensor 1 set in the positioning device is used to non-contact scan the cable of the fault section of the distribution network to detect whether there is a high-frequency current signal. If an abnormal signal is detected, it is preliminarily determined that the cable may have a fault. Step 3: Fault area location. In the area where an abnormal signal is preliminarily detected, the magnetic field imager 2 in the positioning device is used to scan the magnetic field distribution around the cable. By analyzing the change of the magnetic field distribution, the fault area is further narrowed down. Step 4: Precise fault point location. Combining the frequency and amplitude of the fault signal provided by the high-frequency current sensor 1 and the spatial position of the fault point provided by the magnetic field imager 2, the precise position of the fault point is determined. Step 5: Fault analysis. According to the waveform characteristics of the high-frequency current signal and the change of the magnetic field distribution, the fault type is judged. The fault types include partial discharge, short-circuit fault, and grounding fault.

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

[0049] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A distribution network fault section locating device, comprising an upper housing (3), a lower housing (4), a magnetic field imager (2) and a high-frequency current sensor (1), characterized in that: A servo motor (7) is mounted on the lower housing (4), and a driving wheel (5) is fixed on the motor shaft of the servo motor (7); A first fan-shaped seat (11) is provided at one end of the upper shell (3), a second fan-shaped seat (12) is provided at one end of the lower shell (4), brush plates (13) are slidably connected to the second fan-shaped seat (12) and the first fan-shaped seat (11), respectively, a resistance frame (14) is slidably connected to the upper shell (3), a first wedge block (15) is fixed to one of the brush plates (13), the resistance frame (14) is in resistance to the first wedge block (15), and a spray assembly is provided on the upper shell (3), and one end of the spray assembly is connected to the resistance frame (14).

2. The distribution network fault section locating device according to claim 1, characterized in that: The spray assembly comprises a water tank (111), the water tank (111) being fixed on the upper shell (3), and a piston cylinder (112) being connected to a water outlet at the lower end of the water tank (111), a first piston plate (113) being slidably connected inside the piston cylinder (112), a first piston rod (114) being mounted on the first piston plate (113), the first piston rod (114) being slidably connected to the upper shell (3), and one end of the first piston rod (114) being fixedly connected to the abutment frame (14), a plurality of spray heads (115) being fixed on the first sector seat (11), and a water outlet of the piston cylinder (112) being connected to the spray head (115) via a conduit; The magnetic field imager (2) and the high-frequency current sensor (1) are both mounted on the lower housing (4); a driven wheel (8) is rotatably connected to one side of the lower housing (4); telescopic rods (9) are symmetrically arranged on the upper housing (3); a guide wheel (10) is rotatably connected to the telescopic rods (9); a first connecting rod (17) is rotatably connected between the abutment frame (14) and one of the guide wheels (10); a first spring (16) is connected between one of the brush plates (13) and the second fan-shaped seat (12); a seventh spring (6) is connected between the other brush plate (13) and the first fan-shaped seat (11); and a counterweight (46) is mounted on the lower housing (4).

3. The distribution network fault section locating device according to claim 2, characterized in that: A first cleaning seat (18) is fixed on the lower shell (4), a first sliding bracket (181) is fixed on the first cleaning seat (18), a first hollow plate (19) is arranged inside the first cleaning seat (18), the first sliding bracket (181) is elastically connected to the first hollow plate (19) via a second spring (20), a second cleaning seat (21) is fixed on the upper shell (3), a second sliding bracket (22) is fixed on the second cleaning seat (21), a second hollow plate (23) is arranged inside the second cleaning seat (21), the second sliding bracket (22) is elastically connected to the second hollow plate (23) via a third spring (24), a hollow tube (231) is arranged at the lower end of the second hollow plate (23), the hollow tube (231) is inserted into the first hollow plate (19), and sponge cleaning blocks (25) are installed on both the first hollow plate (19) and the second hollow plate (23).

4. The device for locating a fault section of a distribution network according to claim 4, characterized in that: A mounting block (26) is slidably connected to one side of the first cleaning seat (18); one end of the mounting block (26) is fixedly connected to the first hollow plate (19); and a second connecting rod (27) is rotatably connected between the mounting block (26) and the driving wheel (5).

5. The device for locating a fault section of a distribution network according to claim 5, characterized in that: A first extrusion plate (28) is arranged in the first cleaning seat (18), and the first extrusion plate (28) is elastically connected to the first sliding bracket (181) via a fourth spring (29). A second extrusion plate (30) is arranged in the second cleaning seat (21), and the second extrusion plate (30) is elastically connected to the second sliding bracket (22) via a fifth spring (301), and the lower end of the second extrusion plate (30) is inserted into the first extrusion plate (28).

6. The device for locating a fault section of a distribution network according to claim 5, characterized in that: The second extrusion plate (30) is provided with a first abutment strip (31), the first abutment strip (31) is slidably connected to the second cleaning seat (21), and the abutment frame (14) is slidably connected to a third wedge block (32), the third wedge block (32) is elastically connected to the abutment frame (14) via a sixth spring (33).

7. The device for locating a fault section of a distribution network according to claim 6, characterized in that: Both sides of the second extrusion plate (30) are rotatably connected to a rotating rod (34), a third extrusion plate (35) is fixed on the rotating rod (34), the third extrusion plate (35) is fixed on the rotating rod (34), a first torsion spring (36) is installed between the rotating rod (34) and the second extrusion plate (30), a fourth wedge block (37) is fixed on the third extrusion plate (35), and second abutment bars (38) are fixed on both sides of the second hollow plate (23).

8. The device for locating a fault section of a distribution network according to claim 7, characterized in that: A plurality of water absorption holes are provided on the side surfaces of the first hollow plate (19) and the second hollow plate (23), and a water absorption seat (39) is fixed at the lower end of the first cleaning seat (18); a water inlet of the water absorption seat (39) is connected to a water outlet at the lower end of the first hollow plate (19) through a pipeline; a valve inlet plate (40) is rotatably connected to the water inlet of the water absorption seat (39), and a valve outlet plate (41) is rotatably connected to the water outlet of the water absorption seat (39); the valve inlet plate (40) and the valve outlet plate (41) are elastically connected to the water absorption seat (39) through a second torsion spring; and an arc-shaped sealing strip (42) is installed on one side of the first hollow plate (19) and the second hollow plate (23).

9. The device for locating a fault section of a distribution network according to claim 8, characterized in that: A second piston plate (43) is slidably connected to the water absorption seat (39), a second piston rod (44) is connected to the second piston plate (43), and a connecting bracket (45) is connected between the second piston rod (44) and the mounting block (26).

10. The positioning method of the distribution network fault section positioning device according to any one of claims 1 to 9, characterized in that: The specific steps include: Step 1: Installation of the positioning device: The staff deploys a positioning device in each distribution network section and manually installs the positioning device on the cable in the distribution network section; Step 2: Preliminary detection: when the distribution network background collects a fault signal of a distribution network section, the positioning device is driven. When a fault occurs, the positioning device is driven to move on the cable, and a high-frequency current sensor (1) provided in the positioning device is used to perform non-contact scanning on the cable of the distribution network fault section to detect whether there is a high-frequency current signal. If an abnormal signal is detected, it is preliminarily determined that the cable may be faulty. Step 3: locating the fault area. In the area where the abnormal signal is initially detected, the magnetic field imager (2) in the positioning device is used to scan the magnetic field distribution around the cable, and the fault area is further narrowed by analyzing the change of the magnetic field distribution. Step 4: Accurately locate the fault point, combining the frequency and amplitude of the fault signal provided by the high-frequency current sensor (1) and the spatial position of the fault point provided by the magnetic field imager (2), to determine the exact position of the fault point; Step 5: Fault analysis: determine the fault type based on the waveform characteristics of the high-frequency current signal and the changes in the magnetic field distribution. The fault types include partial discharge, short circuit fault and ground fault.

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