A distributed traveling wave fault location device for distribution network lines

Abstract

The invention relates to the technical field of traveling wave fault locating equipment, and specifically discloses a distributed traveling wave fault locating equipment for distribution network lines, comprising a shell; a connecting frame; a storage cylinder; a connecting mechanism, the connecting mechanism being located outside the connecting frame; and a detecting mechanism, the detecting mechanism being connected to the connecting mechanism. The distributed traveling wave fault locating equipment for distribution network lines connects the shells outside adjacent cables to each other through the connecting mechanism, and keeps two adjacent shells at a suitable distance through the connecting mechanism. The detection mechanism is arranged to detect the change of the magnetic field when the shells are close to each other, and detects whether the cable is broken through the change of the distance and the magnetic field, so that the staff can combine the signals sent by the shell and the detecting mechanism to comprehensively analyze whether the alarm signal sent by the shell is a false alarm caused by the close distance of the cables, and assist the staff to check the alarm signal, thereby reducing the workload of the staff.

Description

Technical Field

[0001] The present invention relates to the technical field of traveling wave fault locating equipment, in particular to a distributed traveling wave fault locating equipment for a distribution network line. Background Art

[0002] Traveling wave fault location equipment is a device used to quickly and accurately locate fault points in power lines (including cables). Its working principle is mainly based on traveling wave theory, that is, when a power line fails, a voltage pulse will be generated at the fault point. This pulse propagates in the cable or line in the form of a traveling wave. The location of the fault point is determined by analyzing the propagation characteristics, reflection characteristics and waveform characteristics of these traveling waves.

[0003] However, in actual applications, due to space limitations, different cables need to be laid in parallel, which causes the traveling wave fault locating devices fixed on the cable surface to be closer. When encountering severe weather such as strong winds, the shaking of the cables causes the traveling wave fault locating devices located on the outside to be close to each other, thereby generating signal coupling. Signal coupling means that when devices are close, the traveling wave signal received by one device is likely to be transmitted to another device in some way (such as capacitive coupling, inductive coupling, etc.), causing signal crosstalk, causing false operation or false alarm between devices, and causing maintenance personnel to go to the wrong fault point for maintenance, wasting time and resources. Multiple inspections are required to find the real fault point, increasing maintenance costs and workload. To this end, we propose a distributed traveling wave fault locating device for distribution network lines. Summary of the invention

[0004] The purpose of the present invention is to provide a distributed traveling wave fault locating device for distribution network lines to solve the problem in the above background technology that maintenance personnel go to the wrong fault point for maintenance, wasting time and resources, and need multiple inspections to find the real fault point, which increases maintenance costs and workload.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a distributed traveling wave fault location device for a distribution network line, comprising a housing, the housing being provided with a plurality of components; further comprising: a connecting frame, the connecting frames being respectively located at the upper and lower sides of the housing; a storage cylinder, the storage cylinder being rotatably connected to the connecting frame located at the lower end of the housing;

[0006] A connecting mechanism, which is located outside the connecting frame and connects two adjacent connecting frames with the storage tube;

[0007] The detection mechanism is connected to the connecting mechanism. When two adjacent shells are close to each other, the connecting mechanism drives the detection mechanism to slide on the inner wall of the storage tube. When the detection mechanism slides on the inner wall of the storage tube, the magnetic field changes around the cable are detected.

[0008] Among them, the connecting mechanism includes a mounting frame located outside the connecting frame, a connecting rod is fixedly connected to the outside of the mounting frame, a accommodating box is fixedly connected to one end of the connecting rod away from the mounting frame, the accommodating box is slidably connected to the inner wall of the storage tube, a return spring is fixedly connected to the outside of the storage tube, and the return spring is fixedly connected to the inner wall of the storage tube.

[0009] Among them, the detection mechanism includes a rotating rod rotatably connected to the inner wall of the containing box, the inner wall of the containing box stores magnetorheological fluid, a stirring blade is fixedly connected to the outside of the rotating rod, both ends of the rotating rod pass through the inner wall of the containing box, one end of the rotating rod is provided with a detection part for detecting the rotation speed of the rotating rod, and the other end of the rotating rod is provided with a transmission part for driving the rotating rod to rotate when the two shells approach each other.

[0010] Among them, the detection part includes a baffle plate fixedly connected to the outside of the rotating rod, a detection box is fixedly connected to the outside of the accommodating box, the baffle plate is located inside the detection box, a photoelectric speed sensor is installed in the detection box, and the photoelectric speed sensor is located outside the baffle plate.

[0011] Among them, a battery panel is installed on the inner wall of the detection box. The battery panel is composed of multiple button batteries connected in series, and the battery panel is connected to the photoelectric speed sensor.

[0012] Among them, the transmission part includes a rack fixedly connected to the inner wall of the storage tube, a transmission gear is meshed on the outer side of the rack, a transmission column is fixedly connected to one end of the rotating rod close to the transmission gear, the transmission column is rotationally connected to the transmission gear, and a limit part is provided between the transmission column and the transmission gear.

[0013] Among them, the limiting member includes a ratchet fixedly connected to the transmission gear, the inner wall of the transmission column is provided with a rotating groove rotatably connected to the ratchet, and the inner wall of the rotating groove is fixedly connected to a plurality of rubber blocks, and the rubber blocks are located in the tooth grooves of the ratchet.

[0014] Wherein, an arc-shaped end is arranged at one end of the rubber block close to the ratchet wheel.

[0015] The connecting rod is divided into a fixed part and a telescopic part, and the fixed part and the telescopic part are threadedly connected.

[0016] Wherein, a rotating shaft is fixedly connected to the inner side of the mounting frame, and the rotating shaft is rotatably connected to the inner wall of the connecting frame.

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

[0018] When the present application is in use, the shells on the outside of adjacent cables are connected to each other through a connecting mechanism, and the two adjacent shells are kept at an appropriate distance through the connecting mechanism. Therefore, when encountering severe weather such as strong winds, when external factors such as strong winds and broken branches cause the cables to approach each other, the cables drive the shells to approach each other, and the detection mechanism is set up to detect the changes in the magnetic field when the shells approach each other. Through the changes in distance and magnetic field, it is detected whether the cable is broken, which is convenient for the staff to combine the signals sent by the shell and the detection mechanism to comprehensively analyze whether the alarm signal issued by the shell is a false alarm caused by the close distance of the cables, assist the staff to check the alarm signal, and reduce the workload of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall front view of the present invention;

[0021] Figure 3 It is a side cross-sectional schematic diagram of the storage tube of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the detection mechanism of the present invention;

[0023] Figure 5 It is a side cross-sectional schematic diagram of the detection member of the present invention;

[0024] Figure 6 It is a schematic diagram of the ratchet wheel and the transmission column being separated from each other in the present invention;

[0025] Figure 7 It is a schematic diagram of the front view of the limiter of the present invention;

[0026] Figure 8 It is a schematic diagram of the fixed part and the telescopic part of the present invention in a separated state.

[0027] In the figure: 1. shell; 2. connecting frame; 3. storage tube; 4. connecting mechanism; 40. mounting frame; 41. connecting rod; 42. containing box; 43. reset spring; 44. fixing part; 45. telescopic part; 46. rotating shaft; 5. detecting mechanism; 50. rotating rod; 51. magnetorheological fluid; 52. stirring blade; 53. detecting member; 54. transmission member; 55. shielding plate; 56. detecting box; 57. photoelectric speed sensor; 58. battery panel; 59. rack; 510. transmission gear; 511. transmission column; 512. limiting member; 513. ratchet; 514. rotating groove; 515. rubber block; 516. arc end. DETAILED DESCRIPTION

[0028] 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.

[0029] Embodiment 1

[0030] See also Figures 1 to 8 The present invention provides a technical solution: a distributed traveling wave fault locating device for a distribution network line, comprising a shell 1, which is provided with a plurality of shells; further comprising: a connecting frame 2, which is respectively located on the upper and lower sides of the shell 1; a storage tube 3, which is rotatably connected to the connecting frame 2 located at the lower end of the shell 1; a connecting mechanism 4, which is located outside the connecting frame 2, and the connecting mechanism 4 connects two adjacent connecting frames 2 with the storage tube 3; a detecting mechanism 5, which is connected to the connecting mechanism 4, and when two adjacent shells 1 are close to each other, the connecting mechanism 4 drives the detecting mechanism 5 to slide on the inner wall of the storage tube 3, and the detecting mechanism 5 detects the change of the magnetic field around the cable when sliding on the inner wall of the storage tube 3.

[0031] When in use, the staff installs the shell 1 of the traveling wave fault locating device on the outside of the cable, and captures the traveling wave signals generated in the distribution network or cable through the sensor in the shell 1. These signals are usually electromagnetic waves generated by fault current or voltage. The two adjacent shells 1 are connected through the connecting mechanism 4, that is, the top connecting frame 2 of one shell 1 is connected to the storage tube 3 at the bottom end of the other shell 1 through the connecting mechanism 4. The distance between the two shells 1 is preliminarily limited by the connecting mechanism 4, so as to keep the two cables at a suitable distance from each other. When the current flows in the wire, according to the basic principles of electromagnetism, a magnetic field will be generated around the wire. The current intensity in the high-voltage cable is large, so the magnetic field it generates is also correspondingly strong, which avoids the magnetic field generated when the current passes through the cable interfering with the shell 1 on the outside of the adjacent cable.

[0032] When encountering severe weather such as strong winds, when external factors such as strong winds and broken branches cause the cables to be close to each other, the connecting mechanism 4 cannot control the two cables to remain in a reasonable range. The cables drive the shells 1 to be close to each other, and the detection mechanism 5 is set to detect the changes in the magnetic field when the shells 1 are close to each other. Through the changes in distance and magnetic field, it is detected whether the cable is broken, which is convenient for the staff to combine the signals sent by the sensors in the shell 1 and the detection mechanism 5, and through the signals sent by multiple groups of detection mechanisms 5, comprehensively analyze whether the alarm signal issued by the shell 1 is a false alarm caused by the close distance of the cables, assist the staff to check the alarm signal, and reduce the workload of the staff.

[0033] The connecting mechanism 4 includes a mounting frame 40 located on the outside of the connecting frame 2, a rotating shaft 46 is fixedly connected to the inside of the mounting frame 40, the rotating shaft 46 is rotatably connected to the inner wall of the connecting frame 2, a connecting rod 41 is fixedly connected to the outside of the mounting frame 40, a accommodating box 42 is fixedly connected to one end of the connecting rod 41 away from the mounting frame 40, the accommodating box 42 is slidably connected to the inner wall of the storage tube 3, a return spring 43 is fixedly connected to the outside of the storage tube 3, and the return spring 43 is fixedly connected to the inner wall of the storage tube 3.

[0034] When the cable is shaken by external force, the relative rotation between the mounting frame 40 and the connecting frame 2 and the elastic force of the reset spring 43 keep the distance between the two adjacent shells 1 within a suitable range, thereby avoiding signal interference caused by the two shells 1 being too close to each other.

[0035] When the cable encounters severe weather such as strong winds, the external force it receives is greater than the elastic force of the return spring 43. At this time, the connecting rod 41 pushes the storage box 42 to slide on the inner wall of the storage tube 3. The storage box 42 moves to compress the return spring 43, and the storage box 42 drives the detection mechanism 5 to approach the other shell 1, so that the distance between the detection mechanism 5 and the cable is reduced.

[0036] The detection mechanism 5 includes a rotating rod 50 rotatably connected to the inner wall of the containing box 42, the inner wall of the containing box 42 stores a magnetorheological fluid 51, a stirring blade 52 is fixedly connected to the outer side of the rotating rod 50, both ends of the rotating rod 50 pass through the inner wall of the containing box 42, one end of the rotating rod 50 is provided with a detection member 53 for detecting the rotation speed of the rotating rod 50, and the other end of the rotating rod 50 is provided with a transmission member 54 for driving the rotating rod 50 to rotate when the two shells 1 approach each other.

[0037] When current flows in a conductor, a magnetic field is generated around the conductor according to the basic principles of electromagnetism. The closer the distance to the cable is, the stronger the magnetic field strength is. When the container box 42 slides on the inner wall of the storage tube 3, as the container box 42 is closer to the cable, the magnetic field strength it is subjected to increases. The magnetorheological fluid 51 is a material whose rheological properties (such as viscosity and fluidity) can change significantly under the action of an external magnetic field. That is, the greater the intensity of the magnetic field applied by the outside world, the greater the viscosity and the lower the fluidity. When the container box 42 is closer to the cable, the greater the magnetic field strength the magnetorheological fluid 51 is subjected to, and the greater the resistance of the stirring blade 52 to stirring in the magnetorheological fluid 51 is. If the cable is broken, no current flows in the cable, and no magnetic field is generated, and the resistance to the rotating rod 50 does not change.

[0038] Therefore, when the accommodating box 42 slides on the inner wall of the storage tube 3, the accommodating box 42 moves to drive the transmission member 54 to work, and the transmission member 54 drives the rotating rod 50 to rotate. The rotation speed of the rotating rod 50 is detected by the detection member 53. The staff judges the change in the magnetic field strength outside the cable through the change in the rotation speed of the rotating rod 50, and judges whether the cable is broken through the change in the magnetic field, so as to assist the staff to check the alarm signal and reduce the workload of the staff. When the two shells 1 are kept at the initial distance by the reset spring 43, if the shell 1 sends out an alarm signal, the cable where the shell 1 with the alarm signal on the surface is located is faulty, and the staff determines the location of the fault point by analyzing the propagation characteristics, reflection characteristics and waveform characteristics of these traveling waves.

[0039] When encountering severe weather such as strong winds, if the rotation speed of the rotating rod 50 gradually decreases as the shell 1 approaches each other, it indicates that the cable being approached is not broken. The detection component 53 sends this signal to the staff. The staff can determine that the two adjacent cables are approaching each other due to external force based on the signal sent by the detection component 53 and the signal of the shell 1. The staff can go to the signal sending position to separate the two adjacent cables, and re-analyze the shell 1 signal after the cables are separated to determine whether the cables are faulty, thereby assisting the staff to eliminate the situation where the shell 1 issues a false alarm due to the proximity of the cables, and avoiding the staff going to the wrong fault point for repair based on the false alarm signal.

[0040] If the detection member 53 detects that the rotation speed of the rotating rod 50 does not change during the movement, it means that the cable is broken. The staff can go to the fault point for repair based on the information of the shell 1, thereby reducing costs and workload of the staff.

[0041] The detection member 53 includes a baffle plate 55 fixedly connected to the outer side of the rotating rod 50, a detection box 56 fixedly connected to the outer side of the accommodating box 42, the baffle plate 55 is located inside the detection box 56, a photoelectric speed sensor 57 is installed in the detection box 56, the photoelectric speed sensor 57 is located on the outer side of the baffle plate 55, a battery panel 58 is installed on the inner wall of the detection box 56, the battery panel 58 is composed of multiple button batteries connected in series, and the battery panel 58 is connected to the photoelectric speed sensor 57.

[0042] When in use, the photoelectric rotation speed sensor 57 is powered by the battery panel 58 .

[0043] The photoelectric speed sensor 57 is a non-contact sensor based on the photoelectric effect. It uses a photoelectric element to convert the received light signal into an electrical signal, thereby realizing the measurement of the rotation speed of the object. The photoelectric speed sensor 57 consists of a light source and a photosensitive element. When the rotating rod 50 rotates, the rotating rod 50 with the baffle 55 rotates, and the rotating rod 50 will periodically block the light from shining on the photosensitive element. The periodic change of this light is received by the photosensitive element and converted into a change of electrical signal. Then, after circuit processing such as amplification and shaping, a pulse signal proportional to the rotation speed of the object being measured can be output. By measuring the number of pulses output per unit time, the rotation speed of the object being measured can be calculated. The photoelectric speed sensor 57 sends the measured speed signal to the staff background to assist the staff in determining whether the two cables are in a close state.

[0044] The transmission member 54 includes a rack 59 fixedly connected to the inner wall of the storage tube 3, and a transmission gear 510 is meshed on the outer side of the rack 59. A transmission column 511 is fixedly connected to one end of the rotating rod 50 close to the transmission gear 510. The transmission column 511 is rotatably connected to the transmission gear 510, and a limit member 512 is provided between the transmission column 511 and the transmission gear 510.

[0045] When the accommodating box 42 slides on the inner wall of the storage tube 3, the accommodating box 42 drives the transmission gear 510 to rotate on the outside of the rack 59, the rotation of the transmission gear 510 drives the limit piece 512 to rotate, the limit piece 512 drives the transmission column 511 to rotate, and the transmission column 511 drives the rotating rod 50 to rotate. If the viscosity of the magnetorheological fluid 51 increases, the resistance to the rotation of the stirring blade 52 increases, and the limit piece 512 causes a speed difference between the rotating rod 50 and the transmission gear 510; if the viscosity of the magnetorheological fluid 51 remains unchanged, the resistance to the rotation of the stirring blade 52 remains unchanged, so that the transmission column 511 drives the rotating rod 50 to rotate synchronously, so as to cooperate with the photoelectric speed sensor 57 to detect the speed change of the rotating rod 50.

[0046] The limiting member 512 includes a ratchet 513 fixedly connected to the transmission gear 510, and the inner wall of the transmission column 511 is provided with a rotating groove 514 rotatably connected to the ratchet 513. A plurality of rubber blocks 515 are fixedly connected to the inner wall of the rotating groove 514. The rubber blocks 515 are located in the tooth grooves of the ratchet 513, and an arc-shaped end 516 is provided at one end of the rubber block 515 close to the ratchet 513.

[0047] When the resistance of the stirring blade 52 increases, the increased viscosity of the magnetorheological fluid 51 hinders the rotation of the rotating rod 50, while the transmission gear 510 still drives the ratchet 513 to rotate, so that the ratchet 513 and the rubber block 515 are squeezed against each other. After the rubber block 515 is squeezed and deformed, it slides relative to the ratchet 513, so that the rotation speed of the rotating rod 50 is inconsistent with the rotation speed of the transmission gear 510. If the viscosity of the magnetorheological fluid 51 remains unchanged, the resistance of the stirring blade 52 remains unchanged, so that the rotation speed of the rotating rod 50 is synchronized with the transmission gear 510. The staff judges the viscosity change of the magnetorheological fluid 51 through the signal sent by the photoelectric speed sensor 57, and judges the distance between adjacent cables and whether the cables are broken according to the viscosity change of the magnetorheological fluid 51.

[0048] Embodiment 2

[0049] In the second embodiment, other structures remain unchanged. The difference from the first embodiment is that the connecting rod 41 is divided into a fixed portion 44 and a telescopic portion 45, and the fixed portion 44 and the telescopic portion 45 are threadedly connected. Since the arrangement of cables is not limited to vertical distribution, there may be other forms. When connecting the outer shells 1 of cables distributed in different forms, the fixed portion 44 and the telescopic portion 45 of the connecting rod 41 are rotated to increase the length of the connecting rod 41. Different shells 1 are connected without causing the reset spring 43 to generate elastic force. This makes it convenient for staff to judge the distance between adjacent shells 1 during use of the cable, assists staff in checking alarm signals, and reduces the workload of staff.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A distributed traveling wave fault location device for a distribution network line, comprising: A housing (1), wherein the housing (1) is provided with a plurality of; It is characterized by: also including: A connecting frame (2), the connecting frame (2) being located at the upper and lower sides of the shell (1) respectively; A storage cylinder (3), the storage cylinder (3) being rotatably connected to a connecting frame (2) located at the lower end of the shell (1); A connecting mechanism (4), the connecting mechanism (4) being located outside the connecting frame (2), and the connecting mechanism (4) connecting the adjacent connecting frame (2) with the storage tube (3); A detection mechanism (5), the detection mechanism (5) being connected to the connection mechanism (4), and when two adjacent shells (1) are brought close to each other, the connection mechanism (4) drives the detection mechanism (5) to slide on the inner wall of the storage tube (3), and when the detection mechanism (5) slides on the inner wall of the storage tube (3), it detects changes in the magnetic field around the cable; The connecting mechanism (4) comprises a mounting frame (40) located outside the connecting frame (2), a connecting rod (41) being fixedly connected to the outside of the mounting frame (40), a receiving box (42) being fixedly connected to one end of the connecting rod (41) away from the mounting frame (40), the receiving box (42) being slidably connected to the inner wall of the storage tube (3), a return spring (43) being fixedly connected to the inner wall of the storage tube (3), and the return spring (43) being fixedly connected to the inner wall of the storage tube (3); The detection mechanism (5) comprises a rotating rod (50) rotatably connected to the inner wall of the containing box (42), the inner wall of the containing box (42) storing a magnetorheological fluid (51), a stirring blade (52) fixedly connected to the outer side of the rotating rod (50), both ends of the rotating rod (50) passing through the inner wall of the containing box (42), a detection member (53) for detecting the rotation speed of the rotating rod (50) being provided at one end of the rotating rod (50), and a transmission member (54) for driving the rotating rod (50) to rotate when the two shells (1) are close to each other; The detection member (53) comprises a shielding plate (55) fixedly connected to the outer side of the rotating rod (50); a detection box (56) is fixedly connected to the outer side of the accommodating box (42); the shielding plate (55) is located inside the detection box (56); a photoelectric rotation speed sensor (57) is installed inside the detection box (56); and the photoelectric rotation speed sensor (57) is located outside the shielding plate (55); The transmission member (54) comprises a rack (59) fixedly connected to the inner wall of the storage tube (3); a transmission gear (510) is meshed on the outer side of the rack (59); a transmission column (511) is fixedly connected to one end of the rotating rod (50) close to the transmission gear (510); the transmission column (511) is rotationally connected to the transmission gear (510); and a stopper (512) is provided between the transmission column (511) and the transmission gear (510).

2. The distributed traveling wave fault location device for distribution network lines according to claim 1, characterized in that: A battery panel (58) is installed on the inner wall of the detection box (56), the battery panel (58) being composed of a plurality of button batteries connected in series, and the battery panel (58) is connected to the photoelectric rotation speed sensor (57).

3. The distributed traveling wave fault location device for distribution network lines according to claim 1, characterized in that: The limiting member (512) comprises a ratchet (513) fixedly connected to the transmission gear (510); the inner wall of the transmission column (511) is provided with a rotation groove (514) rotationally connected to the ratchet (513); the inner wall of the rotation groove (514) is fixedly connected to a plurality of rubber blocks (515); the rubber blocks (515) are located in tooth grooves of the ratchet (513).

4. The distributed traveling wave fault location device for distribution network lines according to claim 3 is characterized in that: The rubber block (515) is provided with an arc-shaped end (516) at one end close to the ratchet wheel (513).

5. The distributed traveling wave fault location device for distribution network lines according to claim 1, characterized in that: The connecting rod (41) is divided into a fixed portion (44) and a telescopic portion (45), and the fixed portion (44) and the telescopic portion (45) are threadedly connected.

6. The distributed traveling wave fault location device for distribution network lines according to claim 1, characterized in that: A rotating shaft (46) is fixedly connected to the inner side of the mounting frame (40), and the rotating shaft (46) is rotatably connected to the inner wall of the connecting frame (2).

Images