Power distribution network overhead line single-phase earth fault positioning device and method based on unmanned aerial vehicle

Abstract

The invention discloses a power distribution network overhead line single-phase earth fault positioning device and method based on an unmanned aerial vehicle, and belongs to the field of power distribution network unmanned aerial vehicle inspection. Comprising a power supply, an unmanned aerial vehicle and a terminal, and a measuring device and a signal transmission device are assembled on the unmanned aerial vehicle. The power supply is used for outputting a current signal of which the frequency is different from the power frequency to an overhead line, the measuring device is used for detecting a magnetic field signal near the line, the signal transmission device comprises a wireless transmitting module for transmitting magnetic field data back to a ground end and a terminal for receiving the data, and the terminal is used for processing and displaying the transmitted data. According to the invention, the mode of the unmanned aerial vehicle-mounted magnetic field sensor is adopted to replace the hanging line measurement of a traditional clamp current meter, remote non-contact measurement can be realized, the efficiency and safety of fault inspection can be improved, and the adopted high-precision micro-magnetic detection sensor can ensure the measurement precision.

Description

Technical Field

[0001] The present invention belongs to the field of distribution network drone inspection, and more specifically, relates to a distribution network overhead line single-phase grounding fault locating device and method based on drone. Background Art

[0002] Most of my country's distribution networks use a small current grounding method. Although they can operate with power for 1 to 2 hours after a single-phase grounding fault occurs, in order to reduce the power outage time and prevent the further development of the fault, the fault point must be located and the fault must be eliminated as soon as possible. Therefore, accurate and efficient fault location technology is conducive to improving the reliability of power supply.

[0003] A common method for fault inspection of distribution networks is to inject current into the line and detect the injection amount on the line to find and locate the fault point. Currently, most of the methods are manual, requiring inspectors to go to the site in person to determine the location of the fault point through close-range measurements, which is time-consuming and labor-intensive. At the same time, the complex geographical environment along the line increases the difficulty of the inspectors' work and reduces the efficiency of line inspection.

[0004] UAVs are a new type of aircraft, and their main application scenarios in power systems include power inspection, line planning, special operations, etc. Power inspection includes infrared inspection to identify equipment anomalies, fault inspection to quickly locate faults, etc. Due to the flexibility, safety and small terrain restrictions of UAVs, the work difficulty of inspectors can be greatly reduced, and the inspection efficiency and quality can be comprehensively improved.

[0005] Using drones for distribution network fault inspections can quickly approach the lines and use the sensors on the drones to quickly identify and judge fault information. Inspectors can make real-time judgments on the data sent back on the ground to quickly determine the location of the fault point. This inspection method can achieve long-distance measurement and fault judgment, greatly improving inspection efficiency, while also ensuring the safety of inspectors. Therefore, research on the use of drones to achieve rapid detection and judgment of distribution line faults has an urgent need and important application value for improving the reliability and safety of power system operation. Summary of the invention

[0006] In view of the defects of the prior art, the purpose of the present invention is to provide a single-phase grounding fault locating device and method for overhead lines of a distribution network based on a drone, aiming to achieve rapid and accurate positioning of the single-phase grounding fault point in the distribution network.

[0007] To achieve the above-mentioned object, the present invention provides a single-phase grounding fault location device for overhead lines of a distribution network based on a drone, comprising a power supply, a drone, and a terminal, wherein the drone is equipped with a measuring device and a signal transmission device;

[0008] The power supply is used to output a current signal, and the current signal is used to inject into the overhead line;

[0009] The measuring device is used to measure the magnetic field around the overhead line when the drone approaches the overhead line. The signal transmission device is used to transmit the measured magnetic field signal to the terminal. The terminal is used to receive the magnetic field signal transmitted by the signal transmission device and give a prompt for fault location based on the magnetic field signal.

[0010] Preferably, the frequency range of the current signal is 1-45 Hz.

[0011] Preferably, the distance between the drone and the overhead line is 1.5-2 m.

[0012] Preferably, the measuring device comprises a signal transmitting antenna and a magnetic field sensor, wherein the magnetic field sensor is fixed to the drone via a connecting rod and maintains a preset distance from the drone.

[0013] The present invention also provides a method for locating a single-phase grounding fault of an overhead line of a distribution network based on an unmanned aerial vehicle, comprising the following steps:

[0014] After a single-phase grounding fault occurs in the overhead line of the distribution network, a current signal is injected into the overhead line under test. When the drone approaches the overhead line, the magnetic field around the overhead line is measured, and the measured magnetic field signal is transmitted to the terminal. The fault location prompt is given based on the magnetic field signal.

[0015] Furthermore, when the drone approaches the overhead line, the magnetic field around the overhead line is measured, the measured magnetic field signal is transmitted to the terminal, and a prompt for fault location is given according to the magnetic field signal, which specifically includes:

[0016] Compare the magnetic field signal sizes of the collection points on both sides of the power supply, take the side with a stronger magnetic field signal as the fault side, and the collection point on the fault side as the first fault point. Then compare the magnetic field signal sizes at the midpoint of the line between the first fault point and the downstream endpoint of the fault side, take the side with a stronger magnetic field signal as the fault side, and the collection point on the fault side as the second fault point. Then compare the magnetic field signal sizes of the first fault point and the second fault point, take the side with a stronger magnetic field signal as the fault side, and repeat the above segmented measurement process until the fault point is accurately located.

[0017] The present invention also provides an electronic device, comprising: a computer-readable storage medium and a processor;

[0018] The computer-readable storage medium is used to store executable instructions;

[0019] The processor is used to read the executable instructions stored in the computer-readable storage medium to execute the above method.

[0020] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to execute the above method.

[0021] The present invention also provides a computer program product, comprising a computer program or instructions, wherein the computer program or instructions implement the above method when executed by a processor.

[0022] Compared with the prior art, the above technical solution conceived by the present invention can achieve the following beneficial effects.

[0023] 1. The present invention adopts the method of drone-mounted magnetic field sensors to realize non-contact measurement of line injection signals, which does not require manual measurement of poles and wires, thereby reducing manpower consumption; at the same time, the speed and safety of drones can improve the efficiency of inspections and ensure the personal safety of inspection personnel.

[0024] 2. Since drone-mounted sensors are used for measurement, it is more convenient and effective than manual measurement in complex terrains such as mountains and rivers.

[0025] 3. Since the drone itself is equipped with a high-definition camera, it can be combined with magnetic field detection to observe the situation on the line in real time, providing an effective means for fault identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the composition of the fault locating device proposed by the present invention.

[0027] Figure 2 It is a schematic diagram of the device proposed in the present invention for realizing fault location.

[0028] Figure 3 It is a schematic diagram of the assembly of the airborne measurement device.

[0029] Figure numerals: 1-power supply, 2-drone and measuring device, 3-cable reel, 4-terminal, 5-magnetic field sensor, 6-signal transmitting antenna, 7-measuring device switch. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] The present invention provides a single-phase grounding fault location device for overhead lines of a power distribution network based on a drone, comprising a power supply, a drone, and a terminal, wherein the drone is equipped with a measuring device and a signal transmission device;

[0032] The power supply is used to output a current signal, and the current signal is used to inject into the overhead line;

[0033] The measuring device is used to measure the magnetic field around the overhead line when the drone approaches the overhead line. The signal transmission device is used to transmit the measured magnetic field signal to the terminal. The terminal is used to receive the magnetic field signal transmitted by the signal transmission device and give a prompt for fault location based on the magnetic field signal.

[0034] Example

[0035] like Figure 1 As shown in the figure, the fault location system consists of a power supply, a sky terminal and a ground terminal. The overall signal chain is: the power supply sends a signal, the magnetic field sensor detects the signal, and then sends it back to the terminal through the wireless module, and finally the host computer software on the terminal processes the signal. Among them, the power supply is a high-voltage frequency-differential power supply with a maximum output voltage of 2kV, and the signal frequency can be adjusted in the range of 1 to 45Hz according to the on-site environment. The weight of the measuring device is less than 500g, and the drone has a load endurance time of more than 20min. The signal transmission distance is greater than 1km, and data can be transmitted in real time at a rate greater than 100Kb / s. The terminal is a handheld terminal that can process the returned data in real time and display the waveform, and can automatically determine the location of the fault point.

[0036] like Figure 2 As shown in the figure, a new implementation method of the fault location system is shown. The power supply 1 injects a different frequency signal into the power outage line. The connection method of the high-voltage output is power supply-cable tray-cable pole-line, and the connection method of the output section is power supply-ground wire-ground pole. The inspection personnel first operate the drone 2 to measure the current signal on both sides of the power supply, that is, ① and ② in the figure. Check the signal strength on the terminal 4. A strong signal can be measured at ②, while the signal measured at ① is very weak. Therefore, it can be determined that ② is the fault side line. Then measure the current signal at the middle section of the fault side line, that is, ③. The measured signal is very weak, indicating that the fault is upstream of this point. Then measure the current signal at the middle section of the line between ② and ③, that is, ④. A stronger signal can be measured, indicating that the fault is downstream of this point, that is, the line between ③ and ④. Continue to repeat the previous segmented measurement process until the fault point is accurately located.

[0037] Furthermore, when the remaining line length is about 1km, the drone can be directly controlled to fly along the line, and the fault can be accurately located by combining magnetic field measurement and high-definition cameras. For a line with a length of 50km, the fault can be located by a maximum of 6 sections.

[0038] like Figure 3 As shown, in the assembly of the airborne measuring device, the magnetic field sensor 5 is extended through a long rod, and the electromagnetic interference of the drone is reduced by increasing the distance from the drone; the remaining modules are integrated into the assembly.

[0039] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-phase grounding fault location device for overhead lines in a distribution network based on an unmanned aerial vehicle, characterized in that: include: A power source (1), a drone (2), and a terminal (4), wherein the drone (2) is equipped with a measuring device and a signal transmission device; The power supply (1) is used to output a current signal, and the current signal is used to inject into the overhead line; The measuring device is used to measure the magnetic field around the overhead line when the drone (2) approaches the overhead line, the signal transmission device is used to transmit the measured magnetic field signal to the terminal (4), and the terminal (4) is used to receive the magnetic field signal transmitted by the signal transmission device and provide a prompt for fault location based on the magnetic field signal.

2. The fault location device according to claim 1, characterized in that: The frequency range of the current signal is 1-45 Hz.

3. The fault location device according to claim 1, characterized in that: The distance between the drone (2) and the overhead line is 1.5 to 2 m.

4. The fault location device according to claim 1, characterized in that: The measuring device includes a signal transmitting antenna and a magnetic field sensor, wherein the magnetic field sensor is fixed on the drone through a connecting rod and maintains a preset distance from the drone.

5. A method for locating single-phase grounding faults in overhead lines of a distribution network based on drones, characterized in that: The following steps are involved: After a single-phase grounding fault occurs in the overhead line of the distribution network, a current signal is injected into the overhead line under test. When the drone approaches the overhead line, the magnetic field around the overhead line is measured, and the measured magnetic field signal is transmitted to the terminal. The fault location prompt is given based on the magnetic field signal.

6. The fault location method according to claim 5, characterized in that: The method of measuring the magnetic field around the overhead line when the drone approaches the overhead line, transmitting the measured magnetic field signal to the terminal, and providing a prompt for fault location according to the magnetic field signal specifically includes: Compare the magnetic field signal sizes of the collection points on both sides of the power supply, take the side with a stronger magnetic field signal as the fault side, and the collection point on the fault side as the first fault point. Then compare the magnetic field signal sizes at the midpoint of the line between the first fault point and the downstream endpoint of the fault side, take the side with a stronger magnetic field signal as the fault side, and the collection point on the fault side as the second fault point. Then compare the magnetic field signal sizes of the first fault point and the second fault point, take the side with a stronger magnetic field signal as the fault side, and repeat the above segmented measurement process until the fault point is accurately located.

7. An electronic device, characterized in that: include: A computer readable storage medium and a processor; The computer-readable storage medium is used to store executable instructions; The processor is configured to read the executable instructions stored in the computer-readable storage medium and execute the method according to claim 5 or 6.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to execute the method according to claim 5 or 6.

9. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the method according to claim 5 or 6 is implemented.

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