Automatic detection device for line fault of power distribution network

Abstract

The invention discloses an automatic detection device for a power distribution network line fault, and relates to the technical field of line fault alarm, the automatic detection device comprises a line fault indicator, the line fault indicator comprises a shell, the bottom surface of the shell is fixedly provided with a bottom plate, and the top surface of the bottom plate is fixedly provided with a processing module for processing information; a wireless module used for transmitting information to a background is fixedly mounted on the top surface of the bottom plate, and a capacitive coupling type voltage probe, a color plate II, a color plate I, an alarm lamp I, an alarm lamp II, a zero sequence current transformer, a processing module, a current sensor and an infrared temperature sensor which are arranged are matched with one another; whether a short-circuit fault occurs in the line or not is accurately judged through the fact that the comprehensive current exceeds the threshold value and the temperature continuously rises, whether a grounding fault occurs in the power distribution network line or not can be detected through the comprehensive voltage and the zero-sequence current, and the fault detection accuracy is improved through comprehensive analysis of the current, the temperature, the voltage and the zero-sequence current; and the possibility of false alarm and missing alarm is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of line fault alarm, and in particular to an automatic detection device for distribution network line faults. Background Art

[0002] The distribution network circuit refers to the link in the power system that is directly connected to the user and distributes electric energy to the user. It is composed of a variety of distribution equipment (or components) and distribution facilities, and is responsible for transmitting electric energy from the high-voltage transmission network or substation to the low-voltage power system of the end user. The distribution network distributes the electric energy obtained from the transmission network to users in cities, rural areas and industrial fields, and transmits the power supply energy to each end-user device through transformers, cables, poles, wires and other transmission and distribution equipment. The distribution network adopts a multi-circuit power supply method, realizes multiple power supplies and automatic backup measures, which is conducive to improving the reliability and stability of power supply. Through the use of intelligent equipment, the distribution network can automatically adjust when the power load fluctuates to ensure stable power supply quality.

[0003] After searching, it was found that there were problems with the line fault indicator in the prior art. When the line fault indicator detects a short circuit or grounding fault in the line, the line fault indicator will drive the indicator disk below to rotate to the red area, but both short circuit and grounding will cause this situation, and the alarm method is single, which means that the staff can only know that the line has a fault, but it is difficult to know what specific type of fault the line has through the alarm, and the type of fault is difficult to distinguish; secondly, the line fault indicator measures the current and voltage in the line through its internal current sensor and voltage sensor, which applies the principle of electromagnetic induction, but in actual use, the magnetic field of the line is affected by many factors, such as temperature, humidity, harmonics of surrounding transformers and adjacent lines. Judging only by voltage and current, the probability of false alarm of the line fault indicator is high, and the fault alarm effect is poor, affecting the use of the line fault indicator on the distribution network.

[0004] Therefore, based on the above search and in combination with the prior art, an automatic detection device for distribution network line faults is proposed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic detection device for distribution network line faults, which has the advantages of humanized alarm mode, low alarm error rate, high stability and good safety, so as to solve the problem proposed in the above background technology that the existing line fault indicator has a single alarm mode and the electromagnetic induction principle is affected by various factors in actual use, resulting in a high probability of false alarms.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An automatic detection device for power distribution network line faults, comprising a line fault indicator, wherein the line fault indicator comprises a shell, a bottom plate is fixedly mounted on the bottom surface of the shell, a processing module for processing information is fixedly mounted on the top surface of the bottom plate, a wireless module for transmitting information to a background is fixedly mounted on the top surface of the bottom plate, and a current sensor for measuring a cable in the line is fixedly mounted on the top surface of the bottom plate; a transparent cover, the transparent cover is mounted on the bottom surface of the bottom plate, and is used to protect the bottom surface of the line fault indicator; two clamping plates, both of which are slidably connected to the top surface of the shell, and are used to fix the line; a fault detection mechanism, the fault A detection mechanism is arranged on the top surface of the shell for detecting line faults; the fault detection mechanism includes a support frame 1, which is fixedly mounted on the bottom surface of the base plate, a drive motor 1 is fixedly mounted on the bottom surface of the base plate, a metal rod is fixedly mounted on the bottom surface of the drive shaft of the drive motor 1, a color plate 1 is rotatably connected inside the support frame 1, a color plate 2 is rotatably connected inside the color plate 1, two alarm lights 2 are fixedly mounted on the bottom surface of the color plate 1, two alarm lights 1 are fixedly mounted on the bottom surface of the color plate 2, and electromagnets are fixedly mounted on the top surfaces of the color plate 1 and the color plate 2, and the electromagnets are rotatably connected to the metal rod.

[0008] Furthermore, the fault detection mechanism also includes two connecting rings, both of which are fixedly mounted on the top surface of the shell, a zero-sequence current transformer for detecting zero-sequence current is fixedly mounted on the top surface of the shell, a capacitive coupling voltage probe is fixedly mounted on the top surface of the shell, a D-dot electric field sensor is fixedly mounted on the top surface of the base plate, a plurality of connecting columns are fixedly mounted on one side of the connecting ring, a mounting ring is fixedly mounted on one side of a plurality of connecting columns, a ratchet is rotatably connected to one side of the ratchet, a synchronous wheel 1 is fixedly mounted on one side of the ratchet, a mounting block is fixedly mounted on one side of the mounting ring, a synchronous wheel 2 is rotatably connected to one side of the mounting block, and a gear for driving the The synchronous wheel 2 rotates the driving motor 2, the outer circumferential wall surface of the synchronous wheel 2 is rotatably connected to the outer circumferential wall surface of the synchronous wheel 1 by a synchronous belt, the inner circumferential wall surface of the connecting ring is fixedly installed with a support frame 2, one side of the support frame 2 and one side of the mounting ring are fixedly installed with a plurality of slide rails, the inside of the slide rails is slidably connected with a slider, a movable block is fixedly installed between every two of the sliders, one end of the movable block is rotatably connected with a roller, one side of the movable block is fixedly installed with an infrared temperature sensor for detecting the line temperature, a mounting column is fixedly installed on one side of the movable block, a sliding column is fixedly installed on one side of the mounting column, a plurality of support holes are opened on one side of the ratchet, and the sliding column is slidably connected with the support hole.

[0009] Furthermore, a fixing frame is fixedly installed on the inner circular wall surface of the mounting ring, an annular groove is opened on one side of the fixing frame, a plurality of pulleys are slidably connected inside the annular groove, a plurality of mounting shafts are fixedly installed on one side of the ratchet, and one end of the mounting shaft is rotatably connected to the pulley.

[0010] Furthermore, a base block is fixedly installed on one side of the mounting ring, a mounting rod is fixedly installed on one side of the base block, the outer circular wall surface of the mounting rod is rotatably connected with a clamping block, the clamping block is movably engaged with the ratchet, and the outer circular wall surface of the mounting rod is sleeved with a torsion spring for resetting the clamping block.

[0011] Furthermore, a fixing ring is fixedly installed on the bottom surface of the base plate, a sliding groove is provided on the top surface of the fixing ring, a support ring is rotatably connected inside the sliding groove, a plurality of steel balls for reducing friction are rotatably connected to the inner bottom surface of the fixing ring, a scraper for cleaning dust on the transparent cover is fixedly installed on the top surface of the support ring, one end of the scraper is rotatably connected to the bottom surface of the transparent cover, and a baffle is fixedly installed on one side of the scraper.

[0012] Furthermore, a rope is fixedly installed on the outer circular wall of the shell, an insulating half ring is fixedly installed on one end of the rope, two supporting tubes are slidably connected to the outer circular wall of the insulating half ring, a spring 1 is fixedly installed inside the supporting tube, and one end of the spring 1 is fixedly connected to one end of the insulating half ring.

[0013] Furthermore, a limiting block is fixedly installed on the bottom surface of the splint, a supporting groove is opened on the top surface of the line fault indicator, a limiting rod is fixedly installed inside the supporting groove, the limiting block is slidably connected to the limiting rod, two springs are sleeved on the outer circular wall surface of the limiting rod, a clamping block is fixedly installed on the top surface of the splint on the left side, and a positioning block is fixedly installed on the top surface of the splint on the right side, clamping rods are rotatably connected on both sides of the positioning block, the clamping rods are movably clamped with the clamping blocks, and magnet bodies are symmetrically installed on both sides of the two splints.

[0014] Furthermore, two protection boxes are installed on the top surface of the line fault indicator, and sealing rings are fixedly installed on both sides of the protection boxes.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The line fault indicator, drive motor 2, synchronous wheel 2, processing module, synchronous belt, synchronous wheel 1, ratchet, mounting ring, sliding column, support hole, movable block, slider, slide rail and roller cooperate with each other to prevent the distribution network line from shaking due to airflow, reduce the impact of the line on the zero-sequence current transformer, avoid contact between the high-temperature line and the zero-sequence current transformer, and reduce the risk of equipment damage;

[0017] Through the cooperation of the capacitive coupled voltage probe, color plate two, color plate one, alarm light one, alarm light two, zero-sequence current transformer, processing module, current sensor and infrared temperature sensor, it can be accurately judged whether a short circuit fault occurs in the line through the comprehensive current exceeding the threshold value and the continuous rise in temperature. The comprehensive voltage and zero-sequence current can detect whether a grounding fault occurs in the distribution network line. Through the comprehensive analysis of current, temperature, voltage and zero-sequence current, the accuracy of fault detection is improved, and the possibility of false alarm and missed alarm is reduced. Through the intuitive color and light indication, the user experience of the staff is improved, and the fault detection effect of the distribution network line is achieved, which is helpful for the maintenance and operation of the distribution network line.

[0018] 2. The insulating half ring can be hung on the distribution network line by cooperating with the set line fault indicator, support tube, insulating half ring, spring and rope. The rope and insulating half ring cooperate as a safety rope for the line fault indicator on the line, further preventing the line fault indicator from falling off the line. 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 bottom view schematic diagram of the transparent cover and bottom plate installation structure of the present invention;

[0021] Figure 3 It is a bottom view schematic diagram of the connection structure between the support frame 1 and the bottom plate of the present invention;

[0022] Figure 4 It is a schematic diagram of the connection structure of the support ring and the fixing ring of the present invention;

[0023] Figure 5 It is a schematic diagram of the connection structure of the rope and the insulating half ring of the present invention;

[0024] Figure 6 It is a schematic diagram of the installation structure of the clamping plate and the housing of the present invention;

[0025] Figure 7 It is a schematic diagram of the installation structure of the connecting ring and the installation ring of the present invention;

[0026] Figure 8 It is a schematic diagram of the installation structure of the ratchet and the installation ring of the present invention;

[0027] Fig. 9 for Figure 8 A is a magnified schematic diagram of the local structure;

[0028] Fig.10 It is a schematic diagram of the connection structure of the pulley and the annular groove of the present invention;

[0029] Fig.11 It is a schematic diagram of the connection structure between the clamping rod and the clamping block of the present invention;

[0030] Fig.12 It is a schematic diagram of the connection structure of color plate 1 and color plate 2 of the present invention.

[0031] In the figure: 1. Line fault indicator; 2. Shell; 3. Bottom plate; 4. Protective box; 5. Sealing ring; 6. Rope; 7. Transparent cover; 8. Insulating half ring; 9. Fault detection mechanism; 10. Fixing ring; 11. Support ring; 12. Scraper; 13. Baffle; 14. Color plate 1; 15. Color plate 2; 16. Drive motor 1; 17. Support frame 1; 18. Slide; 19. Steel ball; 20. Support cylinder; 21. Spring 1; 22. Clamp; 23. Zero sequence current transformer; 24. Capacitive coupling voltage probe; 25. Connecting ring; 26. Connecting column; 27. Mounting ring; 28. Ratchet; 29. ​​Synchronous wheel 1; 30. Synchronous wheel 2; 31. Synchronous belt; 32. Mounting block; 33. Drive motor 2; 34. 4. Support hole; 35. Sliding column; 36. Alarm light 1; 37. Card block; 38. Mounting rod; 39. Torsion spring; 40. Support frame 2; 41. Fixed frame; 42. Slide rail; 43. Slider; 44. Movable block; 45. Mounting column; 46. Infrared temperature sensor; 47. Roller; 48. Annular groove; 49. Mounting shaft; 50. Pulley; 51. Alarm light 2; 52. Support groove; 53. Card block; 54. Positioning block; 55. Card rod; 56. Magnet body; 57. Limit block; 58. Electromagnet; 59. Spring 2; 60. Limit rod; 61. Current sensor; 62. Processing module; 63. D-dot electric field sensor; 64. Wireless module; 65. Metal rod; 66. Base block. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In a typical implementation of this application, please refer to Figures 1 to 12, an automatic detection device for a power distribution network line fault, comprising a line fault indicator 1, the line fault indicator 1 comprising a housing 2, a bottom plate 3 is fixedly mounted on the bottom surface of the housing 2, a processing module 62 for processing information is fixedly mounted on the top surface of the bottom plate 3, a wireless module 64 for transmitting information to a background is fixedly mounted on the top surface of the bottom plate 3, and the fault information can be transmitted to the background of the staff through the cooperation of the wireless module 64 and the nodes on the line, a current sensor 61 for measuring the cable in the line is fixedly mounted on the top surface of the bottom plate 3, and a storage battery for power supply is fixedly mounted on the inner top surface of the housing 2;

[0034] The transparent cover 7 is installed on the bottom surface of the bottom plate 3 by bolts to protect the bottom surface of the line fault indicator 1. The two clamping plates 22 are slidably connected to the top surface of the housing 2 to fix the line. The fault detection mechanism 9 is arranged on the top surface of the housing 2 to detect line faults.

[0035] The fault detection mechanism 9 includes a support frame 17, which is fixedly mounted on the bottom surface of the bottom plate 3, a driving motor 16 is fixedly mounted on the bottom surface of the bottom plate 3, a metal rod 65 is fixedly mounted on the bottom surface of the driving shaft of the driving motor 16, the bottom end of the metal rod 65 is rotatably connected to the inner bottom surface of the support frame 17 through a bearing, the inner rotation of the support frame 17 is connected to a color plate 14, the inner rotation of the color plate 14 is connected to a color plate 2 15, the color plate 14 is red, the color plate 2 15 is yellow, two alarm lights 2 51 are fixedly mounted on the bottom surface of the color plate 14, two alarm lights 36 are fixedly mounted on the bottom surface of the color plate 2 15, the alarm lights 2 51 emit red light corresponding to the color plate 14, the alarm lights 36 emit yellow light corresponding to the color plate 2 15, the top surface of the color plate 14 and the top surface of the color plate 2 15 are both fixedly mounted with electromagnets 58, and the electromagnets 58 are rotatably connected to the metal rod 65;

[0036] Among them, under normal conditions, the support frame 17 can shield the color plate 14 and the color plate 2 15. When a short circuit fault occurs in the distribution network line, the electromagnet 58 on the color plate 14 attracts the metal rod 65. At this time, the driving motor 16 drives the metal rod 65 to rotate, and the rotation of the metal rod 65 drives the color plate 14 to rotate ninety degrees. Correspondingly, when the line fault indicator 1 detects a ground fault in the distribution network line, the color plate 2 15 rotates outward ninety degrees following the metal rod 65. By observing the color of the transparent cover 7, it can be known whether the line is a short circuit fault or a ground fault.

[0037] The fault detection mechanism 9 also includes two connecting rings 25, both of which are fixedly mounted on the top surface of the housing 2, a zero-sequence current transformer 23 for detecting zero-sequence current is fixedly mounted on the top surface of the housing 2, a capacitive coupling voltage probe 24 is fixedly mounted on the top surface of the housing 2, when the line fault indicator 1 is installed on the power distribution network line, the clip of the capacitive coupling voltage probe 24 can clamp the line, and a D-dot electric field sensor 63 for cooperating with the capacitive coupling voltage probe 24 is fixedly mounted on the top surface of the bottom plate 3;

[0038] Among them, the capacitive coupling voltage probe 24 uses the insulation layer of the conductor as a dielectric to construct a capacitive voltage divider to obtain the voltage signal to be measured, and the D-dot electric field sensor 63 indirectly measures the conductor potential by measuring the electric field strength around the conductor, thereby realizing non-contact voltage phasor measurement and providing accurate voltage reference parameters for the fault alarm of the line fault indicator 1;

[0039] When a short circuit occurs in the line, the voltage instability of the line is accompanied by the generation of zero-sequence current. When the line fault indicator 1 determines that the line is grounded, the zero-sequence current transformer 23 needs to detect the zero-sequence current and the capacitive coupling voltage probe 24 and the D-dot electric field sensor 63 need to detect the voltage instability. Both conditions are indispensable to reduce the false alarm of the line fault indicator 1.

[0040] A plurality of connecting columns 26 are fixedly installed on one side of the connecting ring 25, a mounting ring 27 is fixedly installed on one side of the plurality of connecting columns 26, a ratchet 28 is rotatably connected to one side of the mounting ring 27, a synchronous wheel 1 29 is fixedly installed on one side of the ratchet 28, a mounting block 32 is fixedly installed on one side of the mounting ring 27, a synchronous wheel 2 30 is rotatably connected to one side of the mounting block 32, a driving motor 2 33 for driving the synchronous wheel 2 30 to rotate is installed on the other side of the mounting block 32, one end of the driving shaft of the driving motor 2 33 passes through the mounting block 32 and is fixedly connected to one side of the synchronous wheel 2 30, the outer circumferential wall surface of the synchronous wheel 2 30 and the outer circumferential wall surface of the synchronous wheel 1 29 are rotatably connected with a synchronous belt 31, a supporting frame 2 40 is fixedly installed on the inner circumferential wall surface of the connecting ring 25, and one side of the supporting frame 2 40 and one side of the mounting ring 27 are both fixedly installed with A plurality of slide rails 42, wherein a slider 43 is slidably connected inside the slide rail 42, a movable block 44 is fixedly installed between every two sliders 43, the grooves on the slide rail 42 and the slider 43 are both T-shaped structures, one end of the movable block 44 is rotatably connected to a roller 47 through a rotating shaft, an infrared temperature sensor 46 for detecting the line temperature is fixedly installed on one side of the movable block 44, a mounting column 45 is fixedly installed on one side of the movable block 44, a sliding column 35 is fixedly installed on one side of the mounting column 45, a plurality of supporting holes 34 are opened on one side of the ratchet 28, and the sliding column 35 is slidably connected to the supporting hole 34; the drive motor 1 16, the zero-sequence current transformer 23, the drive motor 2 33, the capacitive coupling voltage probe 24, the D-dot electric field sensor 63, the wireless module 64 and the current sensor 61 are all electrically connected to the processing module 62;

[0041] In the process of erecting the distribution network line, the line passes through the zero-sequence current transformer 23 and the connecting ring 25, and the infrared temperature sensors 46 on the multiple movable blocks 44 can measure the line temperature. The temperatures measured by the three infrared temperature sensors 46 are averaged. Only when the average value continues to rise and the current sensor 61 inside the line fault indicator 1 measures a continuous increase in current, can the short-circuit fault alarm of the line fault indicator 1 be triggered;

[0042] In addition, the driving motor 2 33 drives the synchronous wheel 2 30 to rotate, and the synchronous wheel 2 30, the synchronous belt 31 and the synchronous wheel 1 29 cooperate to rotate the ratchet 28. The rotation of the ratchet 28 causes the sliding column 35 to slide inside the support hole 34 and at the same time causes the movable block 44 and the roller 47 to move inward. The inward movement of the movable block 44 drives the slider 43 to move inside the slide rail 42. The slide rail 42 and the slider 43 cooperate to limit the movement of the movable block 44 and the roller 47. The movable block 44 and the roller 47 move inward until they abut against the outer wall of the line, thereby positioning the line to prevent the line from shaking and hitting the zero-sequence current transformer 23.

[0043] By adopting the above technical features, through the set line fault indicator 1, the staff will install the line fault indicator 1 on the line of the distribution network for automatic detection of line faults. The staff will pass the line through the capacitive coupling voltage probe 24, the zero-sequence current transformer 23 and the two connecting rings 25. The processing module 62 inside the line fault indicator 1 starts the drive motor 2 33. The drive shaft of the drive motor 2 33 rotates to drive the synchronous wheel 2 30 to rotate. The rotation of the synchronous wheel 2 30 drives the synchronous belt 31 to rotate. The rotation of the synchronous belt 31 drives the synchronous wheel 1 29 to rotate. The rotation of the synchronous wheel 1 29 drives the ratchet 28 to rotate. The ratchet 28 rotates on the mounting ring 27 so that the sliding column 35 slides inside the support hole 34 on the ratchet 28. The sliding column 35 slides inside the support hole 34 on the ratchet 28 so that the sliding column 35 slides inside the support hole 34 on the ratchet 28. The movable column 35 and the mounting column 45 drive the movable block 44 to move inward, and the inward movement of the movable block 44 drives the slider 43 to slide inside the slide rail 42. The downward movement of the movable block 44 also drives the roller 47 to move downward until the roller 47 abuts against the outer wall of the distribution network line. At this time, multiple groups of movable blocks 44 and rollers 47 can position the line to prevent the distribution network line from shaking in the air due to airflow, avoid the shaking line from contacting the zero-sequence current transformer 23, and reduce the impact of the line on the zero-sequence current transformer 23. In addition, the line has a high temperature during a short-circuit fault. The positioning of multiple groups of movable blocks 44 and rollers 47 can prevent the high-temperature line from contacting the zero-sequence current transformer 23, further prevent the zero-sequence current transformer 23 from being damaged, improve the stability of the line fault indicator 1 during use, and reduce the possibility of equipment damage.

[0044] On the one hand, the staff sets a threshold value for the current sensor 61 inside the line fault indicator 1 and a threshold value for the line temperature according to the material and radius of the line. The infrared temperature sensor 46 on the side of the movable block 44 can measure the temperature of the line. The temperature data measured by multiple infrared temperature sensors 46 are processed by the current sensor 61 to obtain an average value, that is, (A+B+C) / bottom plate 3. This is a calculation formula, where A, B and C are the temperature data measured by the three movable blocks 44 respectively;

[0045] When the current sensor 61 inside the line fault indicator 1 detects that the current in the line exceeds the threshold and continues to increase, the average temperature generated by the multiple active blocks 44 also exceeds the threshold and continues to rise. When the line current continues to increase and the temperature continues to rise, it means that a short circuit fault occurs in the line;

[0046] Correspondingly, when the above two conditions are met, the D-dot electric field sensor 63 will start the electromagnet 58 on the color plate 14, and the electromagnet 58 can adsorb the metal rod 65, and then the drive motor 16 is started, and the drive shaft of the drive motor 16 rotates to drive the metal rod 65 to rotate, and the rotation of the metal rod 65 drives the color plate 14 to rotate through the electromagnet 58. At this time, the color plate 15 will not rotate with the metal rod 65, and the color plate 14 rotates 90 degrees to be perpendicular to the support frame 17. At this time, the two warning lights 2 51 on the color plate 14 will also emit red light. The staff can check the red color plate 14 and the red light inside the transparent cover 7 on the bottom of the line fault indicator 1 to know that there is a short circuit fault in the line;

[0047] On the other hand, the zero-sequence current transformer 23 on the line fault indicator 1 can measure the zero-sequence current in the line. The staff sets a threshold value for the voltage in the line. The capacitive coupling voltage probe 24 uses the coupling capacitance formed by the sensing electrode and the conductor to be measured to sense the voltage. It is close to the line, senses the spatial coupling capacitance of the line, and obtains the differential signal of the conductor to be measured. The D-dot electric field sensor 63 realizes potential measurement by measuring the spatial electric field. It converts the electric field signal into a voltage signal by sensing the electric field strength around the line, and then processes the electric field signal and the voltage signal through the current sensor 61 inside the line fault indicator 1, amplifies, filters, and performs analog-to-digital conversion on the signal, and finally outputs the voltage measurement result, which can detect the voltage in the distribution network line;

[0048] At this time, if the zero-sequence current transformer 23 senses the presence of a zero-sequence current in the line at the same time, it indicates that a ground fault occurs in the distribution network line;

[0049] When these two conditions are met, the electromagnet 58 on the color plate 15 can adsorb the metal rod 65. At this time, the driving shaft of the driving motor 16 rotates to drive the metal rod 65 and the color plate 15 to rotate. The color plate 15 rotates 90 degrees and the two warning lights 36 on the color plate 15 emit yellow light. The staff can see that the inside of the transparent cover 7 on the bottom of the line fault indicator 1 is yellow and can determine that a ground fault has occurred in the distribution network line.

[0050] In this process, the ratchet 28 is driven to rotate by driving the second motor 33, the second synchronous wheel 30, the first synchronous wheel 29 and the second driving motor 33. The movable block 44 and the roller 47 are moved inwards by the rotation of the ratchet 28 until they abut against the outer wall of the line, thereby positioning the line to prevent the zero-sequence current transformer 23 from being damaged due to the shaking of the line; the current sensor 61 detects that the current in the line exceeds the threshold and continues to increase, and the average temperature measured by the multiple infrared temperature sensors 46 also exceeds the threshold and continues to rise. Only when these two conditions are met will a short-circuit fault alarm be issued, that is, the color plate 2 15 and the alarm light 2 51 rotate outward;

[0051] The zero-sequence current transformer 23 senses the presence of zero-sequence current in the line and the voltage measurement result is unstable; these two conditions indicate that a ground fault occurs in the line. Compared with the prior art, this solution uses temperature and current as the preconditions for judging a line short circuit, while line voltage and zero-sequence current are used as the preconditions for judging a line ground fault. Through the comprehensive analysis of current, temperature, voltage and zero-sequence current, the accuracy of fault detection is improved, and the possibility of false alarms and missed alarms is reduced. Not only does it rely on current and voltage as judgment, but it can also use the different colors of color plate one 14 and color plate two 15 to allow staff to quickly distinguish the fault type, thereby achieving the fault detection effect on the distribution network line, which is helpful for the maintenance of the distribution network line;

[0052] In addition, when a short circuit fault or a ground fault occurs, the wireless module 64 will also send information to the background through the terminal installed on the line.

[0053] A fixing frame 41 is fixedly mounted on the inner circular wall surface of the mounting ring 27, and an annular groove 48 is opened on one side of the fixing frame 41. A plurality of pulleys 50 are slidably connected inside the annular groove 48. A plurality of mounting shafts 49 are fixedly mounted on one side of the ratchet 28. One end of the mounting shaft 49 is rotatably connected to the pulley 50 through a bearing. The rotation of the ratchet 28 drives the mounting shaft 49 to rotate and makes the pulley 50 roll inside the annular groove 48. The rotation of the ratchet 28 can be supported by the cooperation of the annular groove 48, the mounting shaft 49 and the pulley 50.

[0054] Specifically, through the arrangement of the ratchet 28, the rotation of the ratchet 28 drives the installation shaft 49 to rotate, and the rotation of the installation shaft 49 drives the pulley 50 to rotate inside the annular groove 48 on the fixed frame 41. The annular groove 48, the installation shaft 49 and the pulley 50 cooperate to support the rotation of the ratchet 28 and improve the stability of the rotation of the ratchet 28.

[0055] A base block 66 is fixedly mounted on one side of the mounting ring 27, a mounting rod 38 is fixedly mounted on one side of the base block 66, a clamping block 37 is rotatably connected to the outer circumferential wall of the mounting rod 38, the clamping block 37 is movably clamped with the ratchet 28, a torsion spring 39 for resetting the clamping block 37 is sleeved on the outer circumferential wall of the mounting rod 38, and two ends of the torsion spring 39 are respectively in contact with one end of the mounting rod 38 and one side of the clamping block 37;

[0056] The rotation of the ratchet 28 causes the block 37 to rotate around the mounting rod 38. When the ratchet 28 rotates to a suitable position, the block 37 is clamped inside the ratchet 28 by the torsion spring 39. The block 37 can limit the rotation of the ratchet 28 and prevent the ratchet 28 from rotating in the opposite direction.

[0057] Specifically, through the arrangement of the ratchet 28, the ratchet 28 rotates so that the block 37 rotates around the mounting rod 38 and twists the torsion spring 39 at the same time. When the ratchet 28 rotates to a suitable position, the block 37 is engaged with the teeth on the ratchet 28 due to the action of the torsion spring 39. At this time, the block 37 can limit the ratchet 28 to prevent the ratchet 28 from rotating in the opposite direction, thereby preventing the movable block 44 and the roller 47 from loosening.

[0058] As a preferred implementation in this embodiment, please refer to Figures 1 to 11 A fixing ring 10 is fixedly installed on the bottom surface of the bottom plate 3, a slide groove 18 is provided on the top surface of the fixing ring 10, a support ring 11 is rotatably connected inside the slide groove 18, a plurality of steel balls 19 for reducing friction are rotatably connected to the bottom surface of the fixing ring 10, the support ring 11 and the slide groove 18 are both T-shaped structures to prevent the support ring 11 and the fixing ring 10 from separating, a scraper 12 for cleaning dust on the transparent cover 7 is fixedly installed on the top surface of the support ring 11, one end of the scraper 12 is rotatably connected to the bottom surface of the transparent cover 7 through a rotating shaft, and a baffle 13 is fixedly installed on one side of the scraper 12;

[0059] The wind blows the baffle 13 , which drives the scraper 12 to rotate along the outer wall of the transparent cover 7 . The scraper 12 can scrape off the dust on the outer wall of the transparent cover 7 , making it easier to see the color plate 1 14 and the color plate 2 15 inside the transparent cover 7 .

[0060] Specifically, through the transparent cover 7, dust may exist on the surface of the transparent cover 7 after long-term use. The wind blows the baffle 13 to drive the scraper 12 to rotate. The scraper 12 rotates along the outer wall of the transparent cover 7, so that the support ring 11 rotates inside the fixed ring 10 and the steel ball 19 rolls. The scraper 12 rotates along the outer wall of the transparent cover 7 to scrape off the dust on the transparent cover 7, making it convenient for people to see the color plate 1 14 and the color plate 2 15 inside the transparent cover 7.

[0061] A rope 6 is fixedly installed on the outer circumferential wall of the housing 2, an insulating half ring 8 is fixedly installed on one end of the rope 6, two support cylinders 20 are slidably connected to the outer circumferential wall of the insulating half ring 8, a spring 21 is fixedly installed inside the support cylinder 20, and one end of the spring 21 is fixedly connected to one end of the insulating half ring 8;

[0062] Among them, after the line fault indicator 1 is installed on the line, the staff moves the support tube 20 outward so that the support tube 20 moves outward along the insulating half ring 8 and compresses the spring 1 21. At this time, the staff hangs the insulating half ring 8 on the line. The staff releases the support tube 20, and the support tube 20 is reset under the action of the spring 1 21, so that the insulating half ring 8 can be restricted on the line.

[0063] Specifically, by setting up the line fault indicator 1, after the line fault indicator 1 is installed on the distribution network line, the staff moves the two support cylinders 20 outward so that the support cylinders 20 move outward along the insulating half ring 8 and the spring 1 21 is compressed. After the two support cylinders 20 move outward, the gap on the insulating half ring 8 is exposed, and the insulating half ring 8 is hung on the line through the gap. The staff loosens the two support cylinders 20, and the force of the spring 1 21 resets the two support cylinders 20. After the two support cylinders 20 are reset, the gap in the insulating half ring 8 is blocked. The rope 6 and the insulating half ring 8 cooperate as a safety rope for the line fault indicator 1 on the line, further preventing the line fault indicator 1 from falling off the line.

[0064] A limiting block 57 is fixedly installed on the bottom surface of the clamping plate 22, a supporting groove 52 is provided on the top surface of the line fault indicator 1, a limiting rod 60 is fixedly installed inside the supporting groove 52, the limiting block 57 is slidably connected to the limiting rod 60, and the outer circumferential wall surface of the limiting rod 60 is sleeved with two springs 59, one end of the spring 59 is fixedly connected to one side of the inner side of the supporting groove 52, and the other end of the spring 59 is fixedly connected to one side of the limiting block 57, a clamping block 53 is fixedly installed on the top surface of the left clamping plate 22, and a positioning block 54 is fixedly installed on the top surface of the right clamping plate 22, and the two sides of the positioning block 54 are rotatably connected with clamping rods 55 through a rotating shaft, and the clamping rods 55 are movably clamped with the clamping block 53, and the two sides of the two clamping plates 22 are symmetrically installed with magnet bodies 56, and the two magnet bodies 56 are adsorbed to each other;

[0065] Among them, the distribution network line passes through the two clamping plates 22, and the line is clamped by squeezing the two clamping plates 22. At this time, the two magnet bodies 56 are attracted to each other, and the clamping rod 55 is rotated to make the clamping rod 55 and the clamping block 53 clamped, and the two clamping plates 22 are limited again, so that the line fault indicator 1 is installed on the line.

[0066] Specifically, through the arrangement of the line fault indicator 1, during the installation of the line fault indicator 1, the line is located between the two clamping plates 22 when passing through the two connecting rings 25. The staff squeezes the two clamping plates 22 to drive the limiting block 57 to move inward along the limiting rod 60 inside the support groove 52 on the top surface of the shell 2, and at the same time, the spring 2 59 is stretched, and the two clamping plates 22 move inward until they are in contact. At this time, the magnet bodies 56 on the two clamping plates 22 are attracted to each other so that the two clamping plates 22 clamp the line, and then the staff rotates the clamping rod 55 outward so that the clamping rod 55 is clamped on the outside of the clamping block 53. The clamping rod 55 and the clamping block 53 further limit the two clamping plates 22, thereby using the two clamping plates 22 to fix the line, and then the line fault indicator 1 is installed on the line, thereby achieving the installation effect of the line fault indicator 1.

[0067] Two protective boxes 4 are installed on the top surface of the line fault indicator 1 by bolts, and sealing rings 5 ​​are fixedly installed on both sides of the protective box 4. The sealing rings 5 ​​can prevent friction between the lines and the protective box 4. The protective box 4 on the left can protect the capacitive coupling voltage probe 24, and the protective box 4 on the right can protect the zero-sequence current transformer 23.

[0068] Specifically, through the setting of the protective box 4, the two protective boxes 4 respectively protect the zero-sequence current transformer 23 and the capacitive coupling voltage probe 24. When the line fault indicator 1 is installed, the line will pass through the inside of the sealing ring 5 on the protective box 4. The sealing ring 5 can prevent the line from directly rubbing against the protective box 4, thereby reducing the wear of the line.

[0069] Working principle: Through the set line fault indicator 1, in the process of installing the line fault indicator 1 on the distribution network line, the distribution network line passes through the two clamping plates 22, and the line is clamped by squeezing the two clamping plates 22. At this time, the two magnet bodies 56 are attracted to each other, and the clamping rod 55 is rotated to make the clamping rod 55 and the clamping block 53 clamp, and the two clamping plates 22 are limited again, so that the line fault indicator 1 is installed on the line;

[0070] Among them, after the line fault indicator 1 is installed on the line, the staff moves the support tube 20 outward so that the support tube 20 moves outward along the insulating half ring 8 and compresses the spring 1 21. At this time, the staff hangs the insulating half ring 8 on the line. The staff loosens the support tube 20, and the support tube 20 is reset under the action of the spring 1 21, so that the insulating half ring 8 can be restricted on the line. The insulating half ring 8 and the rope 6 are used to further improve the safety of the line fault indicator 1 during use;

[0071] Secondly, the driving motor 2 33 drives the synchronous wheel 2 30 to rotate, and the synchronous wheel 2 30, the synchronous belt 31 and the synchronous wheel 1 29 cooperate to rotate the ratchet 28. The rotation of the ratchet 28 causes the sliding column 35 to slide inside the supporting hole 34 and simultaneously causes the movable block 44 and the roller 47 to move inward. The inward movement of the movable block 44 drives the slider 43 to move inside the slide rail 42. The slide rail 42 and the slider 43 cooperate to limit the movement of the movable block 44 and the roller 47. The movable block 44 and the roller 47 move inward until they abut against the outer wall of the line, thereby positioning the line to prevent the line from shaking and hitting the zero-sequence current transformer 23.

[0072] At the same time, the ratchet 28 rotates so that the clamping block 37 rotates around the mounting rod 38. When the ratchet 28 rotates to a suitable position, the clamping block 37 is clamped inside the ratchet 28 by the torsion spring 39. The clamping block 37 can limit the rotation of the ratchet 28 and prevent the ratchet 28 from rotating in the opposite direction.

[0073] On the one hand, when a short circuit occurs in the line, the voltage instability of the line is accompanied by the generation of zero-sequence current. When the line fault indicator 1 determines that the line is grounded, the zero-sequence current transformer 23 needs to detect the zero-sequence current and the capacitive coupling voltage probe 24 and the D-dot electric field sensor 63 need to detect the voltage instability. Both conditions are indispensable, which reduces the false alarm of the line fault indicator 1.

[0074] On the other hand, the infrared temperature sensors 46 on the multiple movable blocks 44 can measure the line temperature, and the temperatures measured by the three infrared temperature sensors 46 are averaged. Only when the average value continues to rise and the current sensor 61 inside the line fault indicator 1 measures a continuous increase in current, can the short circuit fault alarm of the line fault indicator 1 be triggered;

[0075] Correspondingly, under normal conditions, the support frame 17 can shield the color plate 14 and the color plate 2 15. When a short circuit fault occurs in the distribution network line, the electromagnet 58 on the color plate 14 attracts the metal rod 65, and the driving motor 16 drives the metal rod 65 to rotate. The rotation of the metal rod 65 drives the color plate 14 to rotate 90 degrees. When the line fault indicator 1 detects that a ground fault occurs in the distribution network line, the color plate 2 15 rotates outward 90 degrees following the metal rod 65. By observing the color of the transparent cover 7, it can be known whether the line is a short circuit fault or a ground fault.

[0076] Finally, the wind blows the baffle 13, which drives the scraper 12 to rotate along the outer wall of the transparent cover 7. The scraper 12 can scrape off the dust on the outer wall of the transparent cover 7, making it easier to see the color plate 1 14 and the color plate 2 15 inside the transparent cover 7.

[0077] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic detection device for a power distribution network line fault, comprising a line fault indicator (1), characterized in that: The line fault indicator (1) comprises a housing (2), a bottom plate (3) is fixedly mounted on the bottom surface of the housing (2), a processing module (62) for processing information is fixedly mounted on the top surface of the bottom plate (3), a wireless module (64) for transmitting information to a backend is fixedly mounted on the top surface of the bottom plate (3), and a current sensor (61) for measuring a cable in a line is fixedly mounted on the top surface of the bottom plate (3); A transparent cover (7), the transparent cover (7) being mounted on the bottom surface of the base plate (3) and used for protecting the bottom surface of the line fault indicator (1); Two clamping plates (22), both of which are slidably connected to the top surface of the housing (2) and are used to fix the circuit; A fault detection mechanism (9), the fault detection mechanism (9) being arranged on the top surface of the housing (2) and used for detecting line faults; The fault detection mechanism (9) comprises a support frame (17), the support frame (17) being fixedly mounted on the bottom surface of the base plate (3), a drive motor (16) being fixedly mounted on the bottom surface of the base plate (3), a metal rod (65) being fixedly mounted on the bottom surface of the drive shaft of the drive motor (16), a color plate (14) being rotatably connected inside the support frame (17), a color plate (15) being rotatably connected inside the color plate (14), two alarm lights (51) being fixedly mounted on the bottom surface of the color plate (14), two alarm lights (36) being fixedly mounted on the bottom surface of the color plate (15), and electromagnets (58) being fixedly mounted on the top surfaces of the color plate (14) and the color plate (15), and the electromagnets (58) being rotatably connected to the metal rod (65).

2. The automatic detection device for power distribution network line fault according to claim 1 is characterized in that: The fault detection mechanism (9) further comprises two connecting rings (25), both of which are fixedly mounted on the top surface of the housing (2), a zero-sequence current transformer (23) for detecting zero-sequence current is fixedly mounted on the top surface of the housing (2), a capacitive coupling voltage probe (24) is fixedly mounted on the top surface of the housing (2), a D-dot electric field sensor (63) is fixedly mounted on the top surface of the bottom plate (3), and a plurality of A connecting column (26), one side of a plurality of the connecting columns (26) is fixedly mounted with a mounting ring (27), one side of the mounting ring (27) is rotatably connected with a ratchet (28), one side of the ratchet (28) is fixedly mounted with a synchronous wheel 1 (29), one side of the mounting ring (27) is fixedly mounted with a mounting block (32), one side of the mounting block (32) is rotatably connected with a synchronous wheel 2 (30), and the other side of the mounting block (32) is mounted with a gear for driving the synchronous wheel 2 (30) to rotate. The second drive motor (33) of the second synchronous wheel (30) is rotatably connected with the outer circular wall surface of the first synchronous wheel (29) by a synchronous belt (31); the inner circular wall surface of the connecting ring (25) is fixedly installed with a second support frame (40); one side of the second support frame (40) and one side of the mounting ring (27) are fixedly installed with a plurality of slide rails (42); the interior of the slide rail (42) is slidably connected with a slider (43); a movable movable member is fixedly installed between each two sliders (43). A movable block (44) is provided, one end of the movable block (44) is rotatably connected to a roller (47), one side of the movable block (44) is fixedly mounted with an infrared temperature sensor (46) for detecting line temperature, one side of the movable block (44) is fixedly mounted with a mounting column (45), one side of the mounting column (45) is fixedly mounted with a sliding column (35), one side of the ratchet wheel (28) is provided with a plurality of supporting holes (34), and the sliding column (35) is slidably connected to the supporting holes (34).

3. The automatic detection device for power distribution network line fault according to claim 2 is characterized in that: A fixing frame (41) is fixedly mounted on the inner circular wall surface of the mounting ring (27), an annular groove (48) is provided on one side of the fixing frame (41), a plurality of pulleys (50) are slidably connected inside the annular groove (48), a plurality of mounting shafts (49) are fixedly mounted on one side of the ratchet (28), one end of the mounting shaft (49) is rotatably connected to the pulley (50).

4. The automatic detection device for power distribution network line fault according to claim 2 is characterized in that: A base block (66) is fixedly mounted on one side of the mounting ring (27), a mounting rod (38) is fixedly mounted on one side of the base block (66), a clamping block (37) is rotatably connected to the outer circular wall surface of the mounting rod (38), the clamping block (37) is movably clamped with the ratchet (28), and a torsion spring (39) is sleeved on the outer circular wall surface of the mounting rod (38) for resetting the clamping block (37).

5. The automatic detection device for power distribution network line fault according to claim 1, characterized in that: A fixing ring (10) is fixedly mounted on the bottom surface of the bottom plate (3); a slide groove (18) is provided on the top surface of the fixing ring (10); a support ring (11) is rotatably connected inside the slide groove (18); a plurality of steel balls (19) for reducing friction are rotatably connected to the bottom surface of the fixing ring (10); a scraper (12) for cleaning dust on the transparent cover (7) is fixedly mounted on the top surface of the support ring (11); one end of the scraper (12) is rotatably connected to the bottom surface of the transparent cover (7); and a baffle (13) is fixedly mounted on one side of the scraper (12).

6. The automatic detection device for power distribution network line fault according to claim 1, characterized in that: A rope (6) is fixedly mounted on the outer circular wall surface of the shell (2), an insulating half ring (8) is fixedly mounted on one end of the rope (6), two support tubes (20) are slidably connected to the outer circular wall surface of the insulating half ring (8), a spring (21) is fixedly mounted inside the support tube (20), and one end of the spring (21) is fixedly connected to one end of the insulating half ring (8).

7. The automatic detection device for power distribution network line fault according to claim 2, characterized in that: A limiting block (57) is fixedly installed on the bottom surface of the clamping plate (22), a supporting groove (52) is provided on the top surface of the line fault indicator (1), a limiting rod (60) is fixedly installed inside the supporting groove (52), the limiting block (57) is slidably connected to the limiting rod (60), two springs (59) are sleeved on the outer circular wall surface of the limiting rod (60), a clamping block (53) is fixedly installed on the top surface of the clamping plate (22) on the left side, and a positioning block (54) is fixedly installed on the top surface of the clamping plate (22) on the right side, the two sides of the positioning block (54) are rotatably connected with clamping rods (55), the clamping rods (55) are movably clamped with the clamping block (53), and magnet bodies (56) are symmetrically installed on both sides of the two clamping plates (22).

8. The automatic detection device for power distribution network line fault according to claim 1, characterized in that: Two protection boxes (4) are installed on the top surface of the line fault indicator (1), and sealing rings (5) are fixedly installed on both sides of the protection box (4).

Images