Traveling wave distance measurement calibrator and positioning method for distributed power distribution lines

Abstract

This invention discloses a traveling wave ranging calibrator and positioning method for distributed power distribution lines, relating to the field of traveling wave ranging technology. The traveling wave ranging calibrator and positioning method for distributed power distribution lines, through the inclusion of a heat dissipation mechanism, utilizes an electric motor to simultaneously drive two power components to rotate. A gear ring drives the rotation of a fan blade, and the suction force of the fan blade accelerates the airflow speed inside the traveling wave ranging instrument's housing, thus achieving rapid heat dissipation. During rotation, the power components continuously change position, constantly interacting with electronic components at different locations within the traveling wave ranging instrument's housing. Since the airflow speed is faster closer to the power components, targeted heat dissipation can be achieved for electronic components at different locations during the cyclic rotation of the power components, avoiding uneven heat loss within the traveling wave ranging instrument's housing.

Description

Technical Field

[0001] This invention relates to the field of traveling wave rangefinder technology, specifically to a traveling wave rangefinder calibrator and positioning method for distributed power distribution lines. Background Technology

[0002] A traveling wave distance meter (TWDM) is a device used in distributed power distribution lines. It calculates the transmission distance of a signal along a power line by measuring the propagation time of the traveling wave signal. It is widely used in the inspection and fault location of distributed power distribution lines in power systems. It can help engineers quickly and accurately pinpoint fault locations on lines or determine if there are any abnormalities in the cables along the line.

[0003] A traveling wave distance measuring instrument (TWD) calibrator is a device used to test the performance of a TWD instrument. The TWD calibrator verifies the accuracy and precision of the TWD instrument by simulating different fault locations, sending simulated traveling wave signals, and measuring the propagation time of the traveling wave signals on the transmission line. Before assembling and using the TWD instrument, it needs to be tested to ensure that it can function properly.

[0004] Referring to a portable transient traveling wave ranging calibrator (Chinese Patent Publication No. CN207730922U), the accuracy of the ranging device is verified by simulating the time difference between the arrival of the first traveling wave front at a single-end or double-end ranging device during a fault. The calibrator incorporates special designs for high-speed DA conversion, wide-bandwidth, and fast-response current amplifiers to address the characteristics of fault ranging signals. It can perform single-end and double-end verification using preset simulated waveforms, and can also reproduce and verify fault traveling wave signals recorded by the ranging device. Furthermore, this traveling wave ranging calibrator integrates an independent GPS / BeiDou time synchronization device for single-end and double-end detection of the traveling wave ranging device, with the error time controllable within 300ns, resulting in high verification accuracy.

[0005] Referring to a portable traveling wave ranging calibrator published in Chinese Patent Publication No. CN212410842U, the efficiency and accuracy of traveling wave calibration are effectively improved by reducing interference between three-phase traveling wave signals caused by common ground. In addition, the magnetic isolation unit is used to reduce the impact of high-power current output on digital signals and eliminate the common-mode voltage difference between each power amplifier module, further improving the calibration accuracy.

[0006] A comprehensive analysis of the above patents reveals the following defects:

[0007] Existing traveling wave rangefinders have densely packed internal electronic components, which obstructs airflow. Natural heat dissipation methods cannot facilitate rapid air circulation, affecting the stable operation of the rangefinder and posing potential safety hazards. Prolonged heat accumulation inside the traveling wave rangefinder can easily cause overheating and damage to components, shortening its lifespan. For example, a portable transient traveling wave rangefinder calibrator (Chinese Patent Publication No. CN207730922U), while achieving the intended calibration effect, experiences heat accumulation during operation. Lacking an effective active cooling method, relying solely on natural convection cannot quickly dissipate heat from the delicate internal electronic components, easily leading to overheating and malfunction or damage.

[0008] Currently, after prolonged use, dust in the air tends to adhere to the filter screen of the heat dissipation vents on the upper housing of the traveling wave rangefinder. As time accumulates, the dust clogs the filter screen, making it difficult for airflow to pass smoothly. This results in slow airflow inside the traveling wave rangefinder housing, which cannot achieve effective heat dissipation and thus accelerates the aging of the electronic components inside the traveling wave rangefinder.

[0009] Therefore, this invention proposes a traveling wave ranging calibrator and positioning method for distributed power distribution lines to solve the above problems. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this invention provides a traveling wave distance measuring instrument and positioning method for distributed power distribution lines. It solves the problems of existing traveling wave distance measuring instruments having densely packed internal electronic components, which obstructs airflow and prevents rapid air circulation through natural heat dissipation, affecting stable operation and posing potential safety hazards; prolonged heat accumulation inside the traveling wave distance measuring instrument can easily cause component overheating and damage, shortening its lifespan; and dust clogging the filter mesh in the heat dissipation vents hinders smooth airflow, resulting in slow airflow within the instrument's casing, ineffective heat dissipation, and accelerated aging.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a traveling wave ranging calibrator for distributed power distribution lines, comprising a traveling wave ranging instrument housing, a traveling wave ranging instrument fixedly disposed inside the traveling wave ranging instrument housing for detecting the location of faults in the distributed power distribution line, and a calibration mechanism disposed on the front of the traveling wave ranging instrument housing for detecting the functional integrity of the traveling wave ranging instrument. The outer wall of the traveling wave ranging instrument housing has fixedly disposed wiring ports for connecting to the distributed power distribution line on both the front and back sides. An air inlet for air convection cooling is provided on the outer wall of the traveling wave ranging instrument housing. Mounting slots are provided on both the left and right sides of the outer wall of the traveling wave ranging instrument housing. A cooling mechanism for accelerating airflow within the traveling wave ranging instrument housing is disposed inside the mounting slots. A partition is fixedly disposed inside the traveling wave ranging instrument housing to separate the cooling mechanism from the traveling wave ranging instrument.

[0012] The heat dissipation mechanism includes a side plate that is detachably installed inside the mounting slot by bolts, circular through holes on the upper and lower sides of the side wall of the side plate, and dustproof component one and dustproof component two respectively installed inside the two circular through holes. The side wall of the side plate is provided with a driving component for driving the operation of dustproof component one and dustproof component two and dissipating the heat inside the traveling wave rangefinder housing.

[0013] Preferably, the dustproof component one and the dustproof component two are two components with identical structures. The dustproof component one includes a support cylinder fixedly installed inside a circular through hole and a protective cover and an air filter assembly connected to both ends of the support cylinder by threads.

[0014] Preferably, the air filtration assembly includes a mounting ring threaded onto the outer wall of the bearing cylinder, a filter plate fixedly mounted on the inner wall of the mounting ring, and a drive shaft rotatably mounted inside the filter plate. Multiple guiding components and cleaning components for unblocking the filter plate pores are evenly arranged on the outer wall of the drive shaft and on one side of the filter plate. A spring is slidably arranged on the outer wall of the drive shaft and between the guiding components and the filter plate. Drive blocks are fixedly connected to both sides of the outer wall of the drive shaft.

[0015] Preferably, the guiding component includes a drive arm that is uniformly fixed on an outer wall of the drive shaft, and a clearing needle that corresponds one-to-one with the position of the filter hole on the filter plate surface is fixed on the side wall of the drive arm.

[0016] Preferably, the cleaning assembly includes a rotating sleeve rotatably connected to the side wall of the filter plate and a spiral groove formed on the inner wall of the rotating sleeve. A plurality of cleaning brushes are uniformly fixed on the outer wall of the rotating sleeve, and the driving block is slidably connected inside the spiral groove.

[0017] Preferably, the drive assembly includes a gear ring, mounting rods fixedly disposed on the upper and lower sides of the outer wall of the gear ring, and a crossbar fixedly disposed on the side wall of the gear ring. An electric motor carrier box is fixedly disposed on the side wall of the side plate and on one side of the gear ring. An electric motor is fixedly disposed inside the electric motor carrier box. A first gearbox for reducing the speed of the output shaft of the electric motor is fixedly disposed at one end of the electric motor carrier box. The output shaft of the electric motor rotates through the electric motor carrier box and is connected to the input shaft of the first gearbox. The output shaft of the first gearbox is connected to a second drive shaft through a coupling. Power components for heat dissipation at multiple locations in the traveling wave rangefinder housing are fixedly connected to both sides of the outer wall of the second drive shaft. A push rod for pushing the first drive shaft to move is fixedly sleeved on the outer wall of the second drive shaft and on one side of the power components.

[0018] Preferably, the power component includes a support arm fixedly mounted on the outer wall of the second transmission shaft and a second transmission mounted on one side of the support arm. The input shaft of the second transmission is fixedly connected to a rotating shaft via a coupling. The rotating shaft rotatably passes through the support arm and is fixedly connected to a gear that meshes with a gear ring. A fan blade is fixedly connected to the output shaft of the second transmission.

[0019] Preferably, the calibration mechanism includes a circuit board fixedly disposed inside the traveling wave rangefinder housing, a protective cover detachably connected to the top of the circuit board by bolts, and a touch screen module disposed on the top of the protective cover. The top of the circuit board and inside the protective cover are respectively fixedly disposed a processor, a storage module, a power module, a detection port, a communication interface module, a signal generator, and a multi-channel signal receiver.

[0020] This invention also provides a method for locating faults in distributed power distribution lines using a traveling wave ranging calibrator. The method, employing a traveling wave ranging calibrator for distributed power distribution lines, includes the following steps:

[0021] Step 1: Install the traveling wave rangefinder: Install the traveling wave rangefinder at the start and end points of the distributed power distribution line;

[0022] Step 2: Send traveling wave signal: The transmitter inside the traveling wave rangefinder sends a traveling wave signal at the starting point before the fault location;

[0023] Step 3: Receive traveling wave signal: The receiver inside the traveling wave rangefinder receives the traveling wave signal at the end of the line and records the time of signal arrival.

[0024] Step 4: Calculate the propagation time: By measuring the time it takes for the signal to propagate along the line, calculate the time difference between the start and end points of the signal.

[0025] Step 5: Calculate the distance to the fault: Based on the signal propagation time difference and the transmission speed on the line, calculate the distance difference between the fault and the receiving point;

[0026] Step 6: Locate the fault point: Based on the distance difference between the fault and the receiving point, determine the location of the fault point on the line.

[0027] Preferably, in steps four and five, the propagation time and fault distance are calculated three times each. If the results are the same in all three calculations, the result is considered to be an accurate value.

[0028] Beneficial effects

[0029] This invention provides a traveling wave ranging calibrator and positioning method for distributed power distribution lines. Compared with the prior art, it has the following advantages:

[0030] 1. A traveling wave distance measuring instrument and positioning method for distributed power distribution lines, wherein the traveling wave distance measuring instrument housing has connection ports for connecting to the distributed power distribution lines fixedly installed on both the front and back of the outer wall of the housing, and an air inlet for air convection cooling is opened on the outer wall of the housing. Mounting slots are opened on both the left and right sides of the outer wall of the housing, and a cooling mechanism is installed inside the mounting slots to accelerate the airflow inside the housing. An insulating partition is fixedly installed inside the housing to separate the cooling mechanism from the traveling wave distance measuring instrument. This new board addresses the problems of existing traveling wave rangefinders, where the dense distribution of internal electronic components obstructs airflow, hindering natural heat dissipation and affecting stable operation, potentially posing safety hazards. Furthermore, it addresses the issue of heat buildup inside the traveling wave rangefinder, which can lead to component overheating and damage, shortening its lifespan. Additionally, dust clogging the filter mesh in the heat dissipation vents further impedes airflow, resulting in slow airflow within the rangefinder housing, ineffective heat dissipation, and accelerated aging.

[0031] 2. A traveling wave rangefinder and positioning method for distributed power distribution lines, by setting up a heat dissipation mechanism, can use an electric motor to simultaneously drive two power components to rotate, and drive the gear to rotate through a gear ring to achieve the purpose of driving the fan blades to rotate. The suction force of the fan blades can accelerate the air flow speed inside the traveling wave rangefinder housing, thereby achieving the purpose of rapid heat dissipation. Secondly, the power components continuously change their position during rotation, and in this process, they can continuously face the electronic components at different positions inside the traveling wave rangefinder housing. Since the air flow speed is faster closer to the power components, targeted heat dissipation can be carried out on the electronic components at different positions during the cyclic rotation of the power components, avoiding uneven heat dissipation at different positions inside the traveling wave rangefinder housing, so that each position can be adequately cooled. Furthermore, by setting up an electric motor and a gear ring to work together, it is possible to drive two power components to operate simultaneously, eliminating the need to set up a separate power device for each power component, saving the cost of setting up a power device, and making the structure simpler and easier for subsequent inspection and maintenance.

[0032] 3. A traveling wave rangefinder and positioning method for distributed power distribution lines, by setting up dustproof component one and dustproof component two, can use filter plates to filter the air entering the housing of the traveling wave rangefinder, removing dust and other impurities from the air, and preventing dust from accumulating on electronic components and causing heat to be difficult to dissipate quickly; secondly, by setting up a conductive component, the push rod can intermittently push the conductive component to move, so that the cleaning needle can intermittently penetrate the filter hole, achieving the purpose of thoroughly cleaning the filter hole. Compared with traditional cleaning, the method of using the cleaning needle to penetrate the filter hole can clean the impurities inside the filter hole, and the cleaning effect is better; furthermore, when the drive shaft slides inside the rotating sleeve, the drive block can slide along the spiral groove, thereby achieving the purpose of driving the rotating sleeve to rotate. During the rotation of the cleaning brush, the surface of the filter plate can be cleaned, further cleaning the filter plate. Moreover, the rotating sleeve can be driven to rotate during the reciprocating movement of the drive shaft, which greatly improves the cleaning effect.

[0033] 4. A traveling wave ranging calibrator and positioning method for distributed power distribution lines, through the linkage between the drive component and dustproof component one and dustproof component two, can simultaneously drive dustproof component one and dustproof component two while the drive component is dissipating heat, achieving the self-cleaning purpose of dustproof component one and dustproof component two, eliminating the need for separate manual cleaning and reducing the workload of staff; secondly, the mounting ring and protective cover can be quickly installed and removed from the bearing cylinder, facilitating the inspection and maintenance of dustproof component one or dustproof component two.

[0034] 5. A traveling wave distance measuring instrument and positioning method for distributed power distribution lines. By setting up a verification mechanism, the traveling wave distance measuring instrument can be verified before use. By inputting simulated data into the traveling wave distance measuring instrument, the actual working environment data of the traveling wave distance measuring instrument can be simulated. The simulated calculation results are compared with the accurate results, so as to quickly understand whether the traveling wave distance measuring instrument is in normal working condition and avoid the situation of inaccurate results due to the failure of the traveling wave distance measuring instrument. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0036] Figure 2 This is a schematic cross-sectional view of the present invention;

[0037] Figure 3 This is a schematic diagram of the heat dissipation mechanism of the present invention in its assembled state.

[0038] Figure 4 This is a schematic diagram of the first disassembled state of the heat dissipation mechanism of the present invention;

[0039] Figure 5 This is a schematic diagram of the second disassembled state of the heat dissipation mechanism of the present invention;

[0040] Figure 6 This is a schematic diagram of the exploded state structure of the dustproof component of the present invention;

[0041] Figure 7 This is a schematic diagram of the disassembled state structure of the mounting ring, cleaning assembly, and conductive assembly of the present invention;

[0042] Figure 8 For the present invention Figure 3 A magnified structural diagram of part A in the diagram;

[0043] Figure 9 For the present invention Figure 7 A magnified structural diagram of part B in the diagram;

[0044] Figure 10 This is a schematic diagram of the decomposed state structure of the driving component of the present invention;

[0045] Figure 11 For the present invention Figure 10 A magnified structural diagram of part C in the diagram;

[0046] Figure 12 This is a schematic diagram of the decomposed state structure of the verification mechanism of the present invention.

[0047] In the diagram: 1. Traveling wave rangefinder housing; 2. Wiring port; 3. Air inlet; 4. Partition plate; 5. Heat dissipation mechanism; 51. Side plate; 52. Dustproof component one; 521. Bearing cylinder; 522. Protective cover; 523. Mounting ring; 524. Filter plate; 525. Drive shaft one; 526. Rotating sleeve; 527. Cleaning brush; 528. Drive arm; 529. Unclogging needle; 5210. Spring; 5211. Drive block; 53. Dustproof component two; 54. Drive assembly; 541. Gear ring; 542. Mounting rod; 543. Crossbar; 5 44. Electric motor carrier box; 545. Gearbox 1; 546. Drive shaft 2; 547. Push rod; 548. Support arm; 549. Gearbox 2; 5410. Rotating shaft; 5411. Gear; 5412. Fan blade; 6. Calibration mechanism; 61. Circuit board; 62. Protective cover; 63. Touch screen module; 64. Processor; 65. Storage module; 66. Power supply module; 67. Detection port; 68. Communication interface module; 69. Signal generator; 610. Multi-channel signal receiver; 611. High-precision clock module. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] like Figures 1-12 This invention provides two technical solutions: a traveling wave ranging calibrator for distributed power distribution lines, specifically including the following embodiments:

[0050] Example 1: A traveling wave distance measuring calibrator for distributed power distribution lines includes a traveling wave distance measuring housing 1, a traveling wave distance measuring instrument fixedly installed inside the traveling wave distance measuring housing 1 for detecting the location of faults in the distributed power distribution line, and a calibration mechanism 6 installed on the front of the traveling wave distance measuring housing 1 for detecting the functionality of the traveling wave distance measuring instrument. The outer wall of the traveling wave distance measuring housing 1 has fixedly installed wiring ports 2 for connecting to the distributed power distribution line on both the front and back sides. An air inlet 3 for air convection cooling is provided on the outer wall of the traveling wave distance measuring housing 1. Mounting slots are provided on both the left and right sides of the outer wall of the traveling wave distance measuring housing 1. A cooling mechanism 5 is installed inside the mounting slots to accelerate the airflow inside the traveling wave distance measuring housing 1. A partition 4 is fixedly installed inside the traveling wave distance measuring housing 1 to separate the cooling mechanism 5 from the traveling wave distance measuring instrument. Multiple ventilation holes are provided on the surface of the partition 4. A detachable maintenance cover for convenient inspection of the traveling wave distance measuring instrument is provided at the bottom of the traveling wave distance measuring housing 1. The heat dissipation mechanism 5 includes a side plate 51 that is detachably installed inside the mounting slot by bolts, circular through holes on the upper and lower sides of the side wall of the side plate 51, and dustproof component 1 52 and dustproof component 2 53 respectively installed inside the two circular through holes. The side wall of the side plate 51 is provided with a drive component 54 for driving the dustproof component 1 52 and dustproof component 2 53 to operate and dissipate heat inside the traveling wave rangefinder housing 1. The drive assembly 54 includes a gear ring 541, mounting rods 542 fixedly mounted on the upper and lower sides of the outer wall of the gear ring 541, and a crossbar 543 fixedly mounted on the side wall of the gear ring 541. An electric motor carrier box 544 is fixedly mounted on the side wall of the side plate 51 and on one side of the gear ring 541. An electric motor is fixedly mounted inside the electric motor carrier box 544. A gearbox 545 for reducing the speed of the output shaft of the electric motor is fixedly mounted at one end of the electric motor carrier box 544. The output shaft of the electric motor rotates through the electric motor carrier box 544 and is connected to the input shaft of the gearbox 545. The output shaft of the gearbox 545 is connected to a transmission shaft 546 via a coupling. Power components for heat dissipation at multiple locations in the traveling wave rangefinder housing 1 are fixedly connected to both sides of the outer wall of the transmission shaft 546. A push rod 547 for pushing the transmission shaft 525 to move is fixedly mounted on the outer wall of the transmission shaft 546 and on one side of the power components. The power unit includes a support arm 548 fixedly mounted on the outer wall of the second drive shaft 546 and a second gearbox 549 mounted on one side of the support arm 548. The input shaft of the second gearbox 549 is fixedly connected to a rotating shaft 5410 via a coupling. The rotating shaft 5410 rotatably passes through the support arm 548 and is fixedly connected to a gear 5411 that meshes with a gear ring 541. A fan blade 5412 is fixedly connected to the output shaft of the second gearbox 549. One end of the second drive shaft 546 is rotatably connected to the outer wall of the crossbar 543.The calibration mechanism 6 includes a circuit board 61 fixedly installed inside the traveling wave rangefinder housing 1, a protective cover 62 detachably connected to the top of the circuit board 61 by bolts, and a touch screen module 63 installed on the top of the protective cover 62. A processor 64, a storage module 65, a power module 66, a detection port 67, a communication interface module 68, a signal generator 69, and a multi-channel signal receiver 610 are fixedly installed on the top of the circuit board 61 and inside the protective cover 62. Touchscreen module 63: Used for user interaction with the calibrator, setting output signal parameters, selecting test modes, viewing historical data, and displaying ranging results, signal quality, and other relevant information; Processor 64: Used for digital processing and calculation of received signals, including real-time processing of the traveling wave ranging algorithm, and providing accurate ranging results; Storage module 65: Used to store the calibrator's configuration parameters, test data, and results for convenient subsequent analysis and report generation; Power supply module 66: Used to provide a stable power supply to the calibrator, while also featuring low power consumption and energy-saving functions; Detection port 67: Used to connect to the detection port of the traveling wave rangefinder to complete the transmission of detection data; Communication interface module 68: Used for data transmission and control with a computer; Signal generator 69: Used to generate signals with adjustable frequency and amplitude to simulate actual working scenarios; Multi-channel signal receiver 610: Used to receive signals output by the traveling wave rangefinder and convert them into digital signals; High-precision clock module 611: Provides a stable clock signal to ensure measurement accuracy.

[0051] Example 2: The main difference between this example and the first technical solution is that the dustproof component 1 52 and dustproof component 2 53 used in the traveling wave ranging calibrator for distributed power distribution lines are two structurally identical components. Dustproof component 1 52 includes a support cylinder 521 fixedly installed inside a circular through hole and protective covers 522 and an air filter assembly connected to both ends of the support cylinder 521 by threads. One side of the inner wall of the support cylinder 521 has an internal thread groove, and one side of the outer wall of the protective cover 522 has an external thread groove that matches the internal thread groove. The protective cover 522 is connected to the support cylinder 521 using the external thread groove. The side of the outer wall of the support cylinder 521 away from the protective cover 522 has an external thread groove, and one side of the inner wall of the mounting ring 523 has an internal thread groove that matches the external thread groove. The mounting ring 523 is connected to the support cylinder 521 using the internal thread groove. Multiple ventilation openings are evenly distributed on the side wall of the protective cover 522. The air filtration assembly includes a mounting ring 523 threaded onto the outer wall of a support cylinder 521, a filter plate 524 fixedly mounted on the inner wall of the mounting ring 523, and a drive shaft 525 rotatably mounted inside the filter plate 524. A guiding component and a cleaning component for unblocking the filter holes of the filter plate 524 are evenly arranged on the outer wall of the drive shaft 525, located on one side of the filter plate 524. A spring 5210 is slidably mounted on the outer wall of the drive shaft 525, between the guiding component and the filter plate 524. Drive blocks 5211 are fixedly connected to both sides of the outer wall of the drive shaft 525. The guiding component includes a drive arm 528 evenly fixedly mounted on the outer wall of the drive shaft 525. Unblocking needles 529, corresponding one-to-one with the positions of the filter holes on the surface of the filter plate 524, are fixedly mounted on the side wall of the drive arm 528. The cleaning assembly includes a rotating sleeve 526 rotatably connected to the side wall of the filter plate 524 and a spiral groove formed on the inner wall of the rotating sleeve 526. Multiple cleaning brushes 527 are evenly fixed on the outer wall of the rotating sleeve 526. A drive block 5211 is slidably connected inside the spiral groove. When the drive shaft 525 is not subjected to external force, the unclogging needle 529 is outside the filter holes on the surface of the filter plate 524. When the drive shaft 525 is subjected to external force, after the unclogging needle 529 enters part of the filter hole, because the inner diameter of the filter hole is slightly larger than the outer diameter of the unclogging needle 529, the airflow can smoothly clear the gap between the filter hole and the unclogging needle 529. A hemispherical protrusion is fixedly provided at the end of the drive shaft 525 away from the drive arm 528. The protrusion cooperates with the push rod 547 for smooth contact. The drive shaft 525 can only slide back and forth along the inner wall of the filter plate 524 and cannot rotate axially. When the drive block 5211 slides back and forth along the spiral groove, the rotating sleeve 526 can be driven by the drive block 5211 and rotate.

[0052] This invention also provides a method for locating faults in distributed power distribution lines using a traveling wave ranging calibrator. The method, employing a traveling wave ranging calibrator for distributed power distribution lines, includes the following steps:

[0053] Step 1: Install the traveling wave rangefinder: Install the traveling wave rangefinder at the beginning and end of the distributed power distribution line. The transmitter inside the traveling wave rangefinder will send a specific traveling wave signal to the line, and the receiver inside the traveling wave rangefinder will detect the time it takes for the signal to travel through the line.

[0054] Step 2: Send traveling wave signal: The transmitter inside the traveling wave rangefinder sends a traveling wave signal at the starting point before the fault location;

[0055] Step 3: Receive traveling wave signal: The receiver inside the traveling wave rangefinder receives the traveling wave signal at the end of the line and records the time of signal arrival.

[0056] Step 4: Calculate the propagation time: By measuring the time it takes for the signal to propagate along the line, calculate the time difference between the start and end points of the signal.

[0057] Step 5: Calculate the distance to the fault: Based on the signal propagation time difference and the transmission speed on the line, calculate the distance difference between the fault and the receiving point;

[0058] Step 6: Locate the fault point: Based on the distance difference between the fault and the receiving point, determine the location of the fault point on the line.

[0059] Before using a rangefinder, a self-test must be performed to ensure that all functions of the rangefinder are in normal working order. This includes the following steps:

[0060] Step 1: First, operate the calibration mechanism 6 through the touch screen module 63, including setting test parameters and adjusting the detection mode. The signal generator 69 generates the test signal frequency, waveform and amplitude, and transmits the signal to the traveling wave rangefinder. The power module 66 provides a stable and appropriate power supply to the entire system to ensure that the equipment works normally.

[0061] Step 2: The multi-channel signal receiver 610 receives the signal returned by the traveling wave rangefinder and transmits it to the processor 64 for processing;

[0062] Step 3: The high-precision clock module 611 provides an accurate clock signal to ensure the stability and accuracy of the measurement;

[0063] Step 4: The processor 64 receives and processes the signal transmitted from the signal receiver, uses filters, amplifiers, etc. to process the signal, and then calculates the distance and speed.

[0064] Step 5: Store the processed measurement results and calibration data in storage module 65 for subsequent analysis and comparison;

[0065] Step 6: The processed results are displayed on the touch screen module 63 for easy observation and judgment by the operator;

[0066] Step 9: Connect to a computer or network using the communication interface module 68, and transmit the detected results to an external computer.

[0067] When the rangefinder is working, the heat generated by the electronic components accumulates inside the traveling wave rangefinder housing 1. The output shaft of the electric motor transmits power to the first gearbox 545. The first gearbox 545 reduces the speed of the electric motor output shaft to a lower speed, driving the second transmission shaft 546 to rotate at a constant speed. Therefore, the support arms 548 located on both sides of the outer wall of the second transmission shaft 546 rotate synchronously. Since the gear 5411 and the gear ring 541 are meshed, when the gear 5411 revolves around the gear ring 541, the gear 5411 is driven by the gear ring 541 to rotate on its own axis. When the rotating shaft 5410 rotates, it transmits power to the second gearfinder 549. The second gearfinder 549... After the speed change, the speed output from the output shaft of the gearbox increases, and the fan blade 5412, which is fixed on the output shaft of the gearbox 549, rotates rapidly. A suction force is generated on the side of the fan blade 5412 away from the gear ring 541. External air is drawn into the interior of the traveling wave rangefinder housing 1 through the filter plate 524. The hot air inside the traveling wave rangefinder housing 1 is discharged through the air inlet 3. Since the fan blade 5412 rotates rapidly on its own axis while slowly revolving around the gear ring 541, the position of the fan blade 5412 is constantly changing. When it moves to a certain position, the wind force output by the fan blade 5412 at that position is greater than that at other positions, which increases the heat dissipation of the electronic components at that position. At the same time, as the second drive shaft 546 rotates, the push rod 547 rotates synchronously. When the push rod 547 rotates to meet one end of the first drive shaft 525, the first drive shaft 525 is pushed towards the bearing cylinder 521. The spring 5210 undergoes elastic deformation due to the joint compression of the filter plate 524 and multiple drive arms 528. The unclogging needle 529 located on the drive arm 528 penetrates into the filter hole at the corresponding position on the surface of the filter plate 524. Dust and other impurities attached to the filter hole are pushed out. Since the inner diameter of the filter hole is slightly larger than that of the unclogging needle 529, the airflow can pass through the gap between the unclogging needle 529 and the filter hole. When the push rod 547 and the first drive shaft 525 separate, the elastic force of the spring 5210 pushes the first drive shaft 525 to reset, and the unclogging needle 529 is pulled out of the filter hole. At the same time, when the drive shaft 525 slides along the inner wall of the rotating sleeve 526, the drive block 5211 is slidably connected in the spiral groove. The spiral groove is pushed by the drive block 5211 and rotates axially. The cleaning brush 527 cleans the dust attached to the surface of the filter plate 524.

[0068] In this embodiment of the invention, in steps four and five, the propagation time and fault distance are calculated three times each. If the results are the same in all three calculations, the result is considered to be an accurate value.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A traveling wave distance measuring calibrator for distributed power distribution lines, comprising a traveling wave distance measuring instrument housing, a traveling wave distance measuring instrument fixedly disposed inside the traveling wave distance measuring instrument housing for detecting the location of faults in distributed power distribution lines, and a calibration mechanism disposed on the front of the traveling wave distance measuring instrument housing for detecting the functional integrity of the traveling wave distance measuring instrument, characterized in that: The outer wall of the traveling wave rangefinder housing is fixedly provided with wiring ports for connecting to distributed power distribution lines on both the front and back sides. An air inlet for air convection heat dissipation is provided on the outer wall of the traveling wave rangefinder housing. Mounting slots are provided on both the left and right sides of the outer wall of the traveling wave rangefinder housing. A heat dissipation mechanism for accelerating the airflow inside the traveling wave rangefinder housing is provided inside the mounting slots. A partition for separating the heat dissipation mechanism and the traveling wave rangefinder is fixedly provided inside the traveling wave rangefinder housing. The heat dissipation mechanism includes a side plate that is detachably installed inside the mounting slot by bolts, circular through holes on the upper and lower sides of the side wall of the side plate, and dustproof component one and dustproof component two respectively installed inside the two circular through holes. The side wall of the side plate is provided with a drive component for driving the dustproof component one and dustproof component two to operate and dissipating the heat inside the traveling wave rangefinder housing. The dustproof component one and dustproof component two are two components with identical structures. The dustproof component one includes a support cylinder fixedly installed inside a circular through hole and a protective cover and an air filter assembly connected to both ends of the support cylinder by threads. The air filtration assembly includes a mounting ring threaded onto the outer wall of the bearing cylinder, a filter plate fixedly mounted on the inner wall of the mounting ring, and a drive shaft rotatably mounted inside the filter plate. A guiding component and a cleaning component for unblocking the filter plate pores are evenly arranged on the outer wall of the drive shaft and on one side of the filter plate. A spring is slidably arranged on the outer wall of the drive shaft and between the guiding component and the filter plate. Drive blocks are fixedly connected to both sides of the outer wall of the drive shaft. The drive assembly includes a gear ring, mounting rods fixedly mounted on the upper and lower sides of the outer wall of the gear ring, and a crossbar fixedly mounted on the side wall of the gear ring. An electric motor carrier box is fixedly mounted on the side wall of the side plate and on one side of the gear ring. An electric motor is fixedly mounted inside the electric motor carrier box. A gearbox one for reducing the speed of the output shaft of the electric motor is fixedly mounted at one end of the electric motor carrier box. The output shaft of the electric motor rotates through the electric motor carrier box and is connected to the input shaft of the gearbox one. The output shaft of the gearbox one is connected to a transmission shaft two through a coupling. Power components for heat dissipation at multiple locations in the traveling wave rangefinder housing are fixedly connected to both sides of the outer wall of the transmission shaft two. A push rod for pushing the transmission shaft one to move is fixedly sleeved on the outer wall of the transmission shaft two and on one side of the power components. The power unit includes a support arm fixedly mounted on the outer wall of the second transmission shaft and a second gearbox mounted on one side of the support arm. The input shaft of the second gearbox is fixedly connected to a rotating shaft via a coupling. The rotating shaft rotatably passes through the support arm and is fixedly connected to a gear that meshes with a gear ring. A fan blade is fixedly connected to the output shaft of the second gearbox.

2. The traveling wave ranging calibrator for distributed power distribution lines according to claim 1, characterized in that: The conductive assembly includes a drive arm that is uniformly fixed on the outer wall of a drive shaft, and unblocking needles that correspond one-to-one with the filter holes on the filter plate surface are fixed on the side wall of the drive arm.

3. The traveling wave ranging calibrator for distributed power distribution lines according to claim 1, characterized in that: The cleaning assembly includes a rotating sleeve rotatably connected to the side wall of the filter plate and a spiral groove formed on the inner wall of the rotating sleeve. Multiple cleaning brushes are uniformly fixed on the outer wall of the rotating sleeve, and the driving block is slidably connected inside the spiral groove.

4. The traveling wave ranging calibrator for distributed power distribution lines according to claim 1, characterized in that: The calibration mechanism includes a circuit board fixedly installed inside the traveling wave rangefinder housing, a protective cover detachably connected to the top of the circuit board by bolts, and a touch screen module installed on the top of the protective cover. The top of the circuit board and inside the protective cover are respectively fixedly installed a processor, a storage module, a power module, a detection port, a communication interface module, a signal generator, and a multi-channel signal receiver.

5. A method for locating faults in distributed power distribution lines using a traveling wave ranging calibrator, characterized in that: The method for a traveling wave ranging calibrator for distributed power distribution lines as described in any one of claims 1-4 includes the following steps: Step 1: Install the traveling wave rangefinder: Install the traveling wave rangefinder at the start and end points of the distributed power distribution line; Step 2: Send traveling wave signal: The transmitter inside the traveling wave rangefinder sends a traveling wave signal at the starting point before the fault location; Step 3: Receive traveling wave signal: The receiver inside the traveling wave rangefinder receives the traveling wave signal at the end of the line and records the time of signal arrival. Step 4: Calculate the propagation time: By measuring the time it takes for the signal to propagate along the line, calculate the time difference between the start and end points of the signal. Step 5: Calculate the distance to the fault: Based on the signal propagation time difference and the transmission speed on the line, calculate the distance difference between the fault and the receiving point; Step 6: Locate the fault point: Based on the distance difference between the fault and the receiving point, determine the location of the fault point on the line.

6. The method for locating faults in a distribution line using a traveling wave ranging calibrator for distributed power distribution lines according to claim 5, characterized in that: In steps four and five, the propagation time and fault distance are calculated three times each. If the results are the same in all three calculations, the result is considered to be the accurate value.

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