Short-circuit fault early warning system for line

Abstract

The invention, which relates to the technical field of fault early warning, discloses a short-circuit fault early-warning system for a line, comprising a power transmission line analysis unit, a short-circuit risk pre-judgment unit, a short-circuit early-warning module and a local database. According to the invention, the unmanned aerial vehicle intelligently adjusts the distance value with the corresponding power transmission line according to the voltage value of each power transmission line to which the target area belongs, and compensates the appearance variation coefficient of each wire of each section of power transmission line to which the target area belongs to a certain value according to the distance value. The occurrence rate of the short circuit problem caused by appearance damage of the power transmission line is reduced, short circuit danger analysis is performed on each section of the power transmission line to which the target area belongs according to the rainfall state, and the damage of wind blowing tripping is considered in the analysis process, so that the occurrence rate of the short circuit problem caused by the wind blowing tripping of the power transmission line is reduced; therefore, the power utilization safety of the power transmission line is improved, and the transmission efficiency of urban power utilization is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fault early warning, and in particular to a short-circuit fault early warning system for a line. Background Art

[0002] Transmission lines are the lifeblood of many cities. However, due to environmental damage and poor management, the outer insulation of many transmission lines is damaged to a certain extent, increasing the incidence of short circuits between transmission lines due to high-voltage arcs and other reasons, causing transmission lines to catch fire and become scrapped, thereby reducing the power safety and transmission efficiency of the city's transmission lines. Therefore, it is very necessary to provide early warning of short circuit faults in transmission lines.

[0003] Prior art, such as the invention patent application with announcement number: CN111695506B, discloses a method and system for early warning of wind-induced foreign body short-circuit faults on power transmission lines, which includes: step 1: collecting historical wind-induced foreign body short-circuit fault image information; step 2: image processing of historical images; step 3: establishing a geographical map of channel hidden danger distribution according to the importance of the line, geographical characteristics and the wind zone distribution map of the power grid, and dividing the hidden danger area types; step 4: obtaining real-time visual channel image information of the power transmission line; step 5: early warning of foreign bodies on the power transmission line. This invention realizes early warning and real-time alarm of wind-induced foreign body short-circuit.

[0004] Prior art, such as the invention patent application with announcement number: CN116754999A, discloses a method and system for early warning of inter-turn short-circuit fault of dry-type air-core reactor, the method comprising: obtaining simulation data, determining a discrimination threshold for judging inter-turn short-circuit fault of the dry-type air-core reactor; collecting conditioned voltage signal and current signal of the target dry-type air-core reactor; constraining the interval of the voltage and current phase difference to a preset interval; if the phase difference value is greater than or equal to the discrimination threshold, determining that the target dry-type air-core reactor has an inter-turn short-circuit fault. This invention judges whether an inter-turn short-circuit fault occurs in a dry-type air-core reactor by combining the phase difference value, with high accuracy, and is convenient and easy to implement.

[0005] It can be seen from the above scheme that the current line short-circuit warning system lacks certain attention to the hazard analysis of short-circuit caused by windy tripping of transmission lines. Strong winds may cause the transmission lines to swing, causing contact between different wires, thereby causing short-circuit problems. Moreover, if the insulation layer of the transmission line is further deteriorated due to aging or damage under the action of wind, short-circuit problems may occur due to high-voltage arcs between different wires of the transmission line even if there is no contact, thereby increasing the incidence of transmission line fires and causing the transmission line to be scrapped, thereby reducing the safety of power use of the transmission line and reducing the transmission efficiency of urban power use. Summary of the invention

[0006] The purpose of the present invention is to provide a short-circuit fault early warning system for a line, which solves the problems existing in the background technology.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a short-circuit fault warning system for lines, including: a transmission line analysis unit, which is used to perform appearance monitoring of each wire in each section of the transmission line belonging to the target area through a drone at the current monitoring time point, and screen each wire with abnormal appearance and each wire to be analyzed in each section of the transmission line belonging to the target area.

[0008] The power transmission line analysis unit comprises: a power transmission line inspection module and a power transmission line appearance damage analysis module.

[0009] The transmission line inspection module is used to dispatch a drone to monitor each wire of each section of the transmission line belonging to the target area at the current monitoring time point, and obtain the appearance image of each wire of each section of the transmission line belonging to the target area.

[0010] The transmission line appearance damage analysis module is used to analyze the appearance variation coefficient of each wire in each section of the transmission line belonging to the target area, and screen each wire with abnormal appearance and each wire to be analyzed in each section of the transmission line belonging to the target area.

[0011] The short-circuit hazard prediction unit is used to obtain the rainfall status of each section of the transmission line belonging to the target area, and perform short-circuit threat analysis on each wire to be analyzed in each section of the transmission line belonging to the target area according to the rainfall status, and combine the environmental information of the area where each section of the transmission line belonging to the target area is located, so as to screen the short-circuit threat wires in each section of the transmission line belonging to the target area.

[0012] The short-circuit risk prediction unit includes: a transmission line environment information acquisition module, a rainfall short-circuit threat analysis module, a non-rainfall short-circuit threat analysis module and an abnormal transmission line analysis module.

[0013] The transmission line environmental information acquisition module is used to obtain the rainfall status of the area where each section of the transmission line in the target area is located during the future target monitoring time period from the meteorological management platform, so as to screen the sections of the transmission line with rainfall and the sections of the transmission line without rainfall in the target area.

[0014] The short-circuit threat analysis module before rainfall is used to obtain the wind speed value, wind direction, temperature value and humidity value of the area where each section of the transmission line before rainfall belongs to the target area is located from the meteorological management platform, analyze the short-circuit threat coefficient of each wire to be analyzed in each section of the transmission line before rainfall belongs to the target area, and screen each short-circuit threat wire in each section of the transmission line before rainfall belongs to the target area.

[0015] The rainfall short-circuit threat analysis module is used to obtain the rainfall, wind speed and wind direction of the area where each section of the rainfall power transmission line in the target area is located from the meteorological management platform, analyze the short-circuit threat coefficient of each wire to be analyzed in each section of the rainfall power transmission line in the target area, and screen each short-circuit threat wire in each section of the rainfall power transmission line in the target area.

[0016] The abnormal transmission line analysis module is used to summarize the short-circuit threatened wires of each section of the transmission line belonging to the target area based on the short-circuit threatened wires of each section of the transmission line without rainfall and the short-circuit threatened wires of each section of the transmission line with rainfall.

[0017] The short-circuit warning module is used to send each abnormal-looking wire and each short-circuit-threatening wire of each section of the transmission line in the target area to the person in charge of transmission line maintenance.

[0018] The beneficial effects of the present invention are as follows: (1) The power transmission line analysis unit of the present invention monitors the appearance of each wire of each power transmission line in the target area by dispatching a drone. During the monitoring process, the drone intelligently adjusts the distance value with the corresponding transmission line according to the voltage value of each transmission line in the target area, thereby ensuring that the drone will not be damaged due to excessively high voltage of the transmission line, and compensates the appearance variation coefficient of each wire of each section of the transmission line in the target area to a certain extent according to the distance value, thereby ensuring that the wire can be intelligently monitored for appearance damage while reducing the incidence of misjudgment, screening each wire with abnormal appearance in each section of the transmission line in the target area, thereby reducing the incidence of short circuit problems due to appearance damage of the transmission line.

[0019] (2) The short-circuit hazard prediction unit of the present invention performs short-circuit hazard analysis on each section of the transmission line in the target area according to the rainfall status, and takes into account the hazards of windy tripping during the analysis process, thereby reducing the incidence of short-circuit problems in the transmission lines due to windy tripping, and intelligently analyzes the wires that may have short-circuit problems in the future, thereby reducing the incidence of short-circuit problems in the transmission lines due to high-voltage arcs.

[0020] (3) The short-circuit warning module of the present invention can provide warnings to the person in charge of transmission line maintenance, thereby facilitating the person in charge of transmission line maintenance to perform short-circuit prevention operations, reducing the incidence of transmission line fires and the scrap rate of transmission lines, thereby improving the safety of power transmission line use and enhancing the transmission efficiency of urban power use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the system module of the present invention. DETAILED DESCRIPTION

[0023] 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.

[0024] Reference Figure 1 As shown, the present invention provides a short-circuit fault early warning system for a line, comprising: a transmission line analysis unit, a short-circuit hazard prediction unit, a short-circuit early warning module and a local database.

[0025] It should be noted that the transmission line analysis unit is connected to the short-circuit risk prediction unit, the short-circuit risk prediction unit is connected to the short-circuit warning module, and the local database is connected to the transmission line analysis unit and the short-circuit risk prediction unit.

[0026] It should also be noted that the local database is used to store the appropriate distance value between the drone and the transmission line in each voltage value interval, the grayscale variation coefficient decrease compensation value of the camera carried by the drone in each appropriate distance value interval, the initial grayscale value of the wires of each section of the transmission line belonging to the target area, the appearance variation coefficient threshold, the short-circuit threat coefficient threshold of the non-rainfall transmission line, the corresponding short-circuit threat coefficient adjustment parameter value in each temperature value interval and each humidity value interval, the straight line formed by the sections of the non-rainfall transmission line belonging to the target area in the extension direction of the wires, the appropriate wind speed value in the vertical direction of the sections of the non-rainfall transmission line belonging to the target area, the number of wires in each section of the non-rainfall transmission line belonging to the target area, the actual spacing between the wires, the length of each wire to be analyzed and the length between the poles, the lower limit of the allowable wire spacing in each voltage value interval, the short-circuit threat coefficient adjustment parameter value corresponding to each rainfall interval, the upper limit of the allowable rainfall corresponding to each appearance variation coefficient interval, and the short-circuit threat coefficient threshold of the rainfall transmission line.

[0027] The transmission line analysis unit is used to monitor the appearance of each wire in each section of the transmission line belonging to the target area through a drone at the current monitoring time point, and screen each wire with abnormal appearance and each wire to be analyzed in each section of the transmission line belonging to the target area.

[0028] In a specific embodiment of the present invention, the power transmission line analysis unit includes: a power transmission line inspection module and a power transmission line appearance damage analysis module.

[0029] The transmission line inspection module is used to dispatch a drone to monitor each wire of each section of the transmission line belonging to the target area at the current monitoring time point, and obtain the appearance image of each wire of each section of the transmission line belonging to the target area.

[0030] The transmission line appearance damage analysis module is used to analyze the appearance variation coefficient of each wire in each section of the transmission line belonging to the target area, and screen each wire with abnormal appearance and each wire to be analyzed in each section of the transmission line belonging to the target area.

[0031] In a specific embodiment of the present invention, the appearance image of each wire of each section of the transmission line belonging to the target area is obtained by a specific acquisition method: obtaining the voltage value of each section of the transmission line belonging to the target area, the appropriate distance value between the drone and the transmission line in each voltage value interval, mapping to obtain the appropriate distance value of the drone in each section of the transmission line belonging to the target area, and controlling the drone to take all-round photos of each wire at the appropriate distance value from each section of the transmission line belonging to the target area, thereby obtaining the appearance image of each wire of each section of the transmission line belonging to the target area.

[0032] In a specific embodiment, the voltage values ​​of each section of the transmission line belonging to the target area and the appropriate distance values ​​between the drone and the transmission line in each voltage value interval are obtained by: obtaining the voltage values ​​of each section of the transmission line belonging to the target area through voltage sensors installed on each section of the transmission line belonging to the target area, and obtaining the appropriate distance values ​​between the drone and the transmission line in each voltage value interval from a local database.

[0033] In a specific embodiment of the present invention, the appearance variation coefficient of each wire of each section of the transmission line belonging to the target area is analyzed, and the specific analysis method is: according to the appearance image of each section of the transmission line belonging to the target area, the gray value a of each pixel point of the appearance image of each wire of each section of the transmission line belonging to the target area is obtained through grayscale change. xni , where x represents the number of each section of the transmission line, x=1,2,...,y, y is a positive integer greater than 2, n represents the number of each wire, n=1,2,...,m, m is a positive integer greater than 2, i represents the number of each pixel, i=1,2,...,j, j is a positive integer greater than 2.

[0034] The grayscale variation coefficient decrease compensation value of the camera carried by the UAV in each suitable distance value interval is obtained from the local database. According to the suitable distance value of each section of the transmission line in the target area, the appearance variation coefficient compensation adjustment parameter value c of the UAV in each section of the transmission line in the target area is mapped. x .

[0035] Obtain the initial grayscale value b of the wires of each section of the transmission line in the target area from the local database x , calculate the appearance variation coefficient of each wire in each section of the transmission line in the target area Where e is a natural constant.

[0036] In a specific embodiment, the screening of each abnormal-appearance wire and each wire to be analyzed in each section of the transmission line belonging to the target area is performed by a specific screening method as follows: an appearance variation coefficient threshold is obtained from a local database; if the appearance variation coefficient of a certain wire in a certain section of the transmission line belonging to the target area is greater than the appearance variation coefficient threshold, the wire is marked as an abnormal-appearance wire; otherwise, the wire is marked as a wire to be analyzed, thereby screening each abnormal-appearance wire and each wire to be analyzed in each section of the transmission line belonging to the target area.

[0037] The power transmission line analysis unit of the present invention monitors the appearance of each wire of each power transmission line belonging to the target area by dispatching a drone. During the monitoring process, the drone intelligently adjusts the distance value with the corresponding transmission line according to the voltage value of each transmission line belonging to the target area, thereby ensuring that the drone will not be damaged due to excessively high voltage of the transmission line, and compensates the appearance variation coefficient of each wire of each section of the transmission line belonging to the target area to a certain value according to the distance value, thereby ensuring that the wire can be intelligently monitored for appearance damage while reducing the incidence of misjudgment, screening each wire with abnormal appearance of each section of the transmission line belonging to the target area, thereby reducing the incidence of short circuit problems due to appearance damage of the transmission line.

[0038] The short-circuit hazard prediction unit is used to obtain the rainfall status of each section of the transmission line belonging to the target area, and perform short-circuit threat analysis on each wire to be analyzed in each section of the transmission line belonging to the target area according to the rainfall status, and combine the environmental information of the area where each section of the transmission line belonging to the target area is located, so as to screen each short-circuit threat wire in each section of the transmission line belonging to the target area.

[0039] It should be noted that the rainfall status includes: rainfall and no rainfall.

[0040] It should be noted that the environmental information of the areas where the various sections of transmission lines belonging to the target area are located includes: the wind speed value, wind direction, temperature value and humidity value of the areas where the various sections of transmission lines belonging to the target area without rainfall are located, and the rainfall, wind speed value and wind direction of the areas where the various sections of transmission lines belonging to the target area with rainfall are located.

[0041] In a specific embodiment of the present invention, the short-circuit risk prediction unit includes: a transmission line environment information acquisition module, a rainfall short-circuit threat analysis module, a non-rainfall short-circuit threat analysis module and an abnormal transmission line analysis module.

[0042] The transmission line environmental information acquisition module is used to obtain the rainfall status of the area where each section of the transmission line in the target area is located during the future target monitoring time period from the meteorological management platform, so as to screen the sections of the transmission line with rainfall and the sections of the transmission line without rainfall in the target area.

[0043] In a specific embodiment, the screening of each section of rainfall transmission line and each section of non-rainfall transmission line belonging to the target area is performed by a specific screening method as follows: if the rainfall state of an area where a section of a transmission line belonging to the target area is located is rainfall, then the section of the transmission line is marked as a rainfall transmission line; otherwise, the section of the transmission line is marked as a non-rainfall transmission line, thereby screening each section of rainfall transmission line and each section of non-rainfall transmission line belonging to the target area.

[0044] The short-circuit threat analysis module before rainfall is used to obtain the wind speed value, wind direction, temperature value and humidity value of the area where each section of the transmission line before rainfall belongs to the target area is located from the meteorological management platform, analyze the short-circuit threat coefficient of each wire to be analyzed in each section of the transmission line before rainfall belongs to the target area, and screen each short-circuit threat wire in each section of the transmission line before rainfall belongs to the target area.

[0045] In a specific embodiment, the short-circuit threat wires of each section of the transmission line without rainfall belonging to the target area are screened, and the specific screening method is: obtaining the short-circuit threat coefficient threshold of the transmission line without rainfall from the local database, if the short-circuit threat coefficient of a certain wire to be analyzed of a certain section of the transmission line without rainfall belonging to the target area is greater than the short-circuit threat coefficient threshold, then the wire to be analyzed is marked as a short-circuit threat wire, thereby screening the short-circuit threat wires of each section of the transmission line without rainfall belonging to the target area.

[0046] The rainfall short-circuit threat analysis module is used to obtain the rainfall, wind speed and wind direction of the area where each section of the rainfall power transmission line in the target area is located from the meteorological management platform, analyze the short-circuit threat coefficient of each wire to be analyzed in each section of the rainfall power transmission line in the target area, and screen each short-circuit threat wire in each section of the rainfall power transmission line in the target area.

[0047] The abnormal transmission line analysis module is used to summarize the short-circuit threatened wires of each section of the transmission line belonging to the target area based on the short-circuit threatened wires of each section of the transmission line without rainfall and the short-circuit threatened wires of each section of the transmission line with rainfall.

[0048] In a specific embodiment of the present invention, the short-circuit threat coefficient of each to-be-analyzed electric wire of each section of the transmission line without rainfall in the target area is analyzed, and the specific analysis method is: according to the wind speed value and wind direction of the area where each section of the transmission line without rainfall in the target area is located, the wind tripping threat coefficient δ of the electric wire of each section of the transmission line without rainfall in the target area is analyzed. p , where p represents the number of each section of the transmission line without rainfall, p = 1, 2, ..., q, q is a positive integer greater than 2.

[0049] According to the appearance variation coefficient of each wire in each section of the transmission line in the target area, the appearance variation coefficient A of each wire to be analyzed in each section of the transmission line without rainfall in the target area is extracted. pt , where t represents the serial number of each wire to be analyzed, t=1, 2, ..., u, and u is a positive integer greater than 2.

[0050] The short-circuit threat coefficient adjustment parameter values ​​corresponding to each temperature value interval and each humidity value interval are obtained from the local database. According to the temperature value and humidity value of the area where each section of the transmission line without rainfall in the target area is located, the short-circuit threat coefficient adjustment parameter value B of each section of the transmission line without rainfall in the target area is mapped. p .

[0051] It should be noted that the higher the temperature value and the lower the humidity value, the larger the corresponding short circuit threat coefficient adjustment parameter value.

[0052] Analyze the short-circuit threat coefficient of each power line to be analyzed in each section of the transmission line without rainfall in the target area

[0053]

[0054] In a specific embodiment of the present invention, the wind-induced tripping threat coefficient of the electric wires of each section of the transmission line without rainfall in the target area is analyzed, and the specific analysis method is: obtain the straight lines formed by the sections of the transmission line without rainfall in the target area in the extension direction of the electric wires from the local database, obtain the straight lines formed by the sections of the transmission line without rainfall in the target area in the wind direction of the area where the sections of the transmission line without rainfall are located according to the wind direction of the area where the sections of the transmission line without rainfall are located, calculate the two complementary angles and their degrees between the straight lines formed by the sections of the transmission line without rainfall in the target area in the extension direction of the electric wires and in the wind direction of the area where the sections of the transmission line without rainfall are located, randomly select one of the angles as the target angle of the sections of the transmission line without rainfall in the target area, and obtain the degree g of the target angle of the sections of the transmission line without rainfall in the target area.p .

[0055] Obtain the appropriate vertical wind speed value f for each section of the transmission line in the target area without rainfall from the local database p , based on the wind speed value d of the area where each section of the transmission line without rainfall belongs to the target area p , calculate the wind hazard coefficient of each section of the transmission line in the target area without rainfall

[0056]

[0057] Calculate the wire shaking accident coefficient ε of each section of the transmission line in the target area without rainfall p .

[0058] Analyze the wind tripping threat coefficient φ of the power lines in each section of the target area without rainfall p =δ p +ε p .

[0059] In a specific embodiment of the present invention, the electric wire shaking accident coefficient of each section of the transmission line in the target area without rainfall is calculated by: obtaining the number of electric wires h of each section of the transmission line in the target area without rainfall from the local database p , the actual spacing between wires k p , the length l of each wire to be analyzed pt and the length r between the poles p .

[0060] According to the voltage values ​​of each section of the transmission line in the target area, the voltage values ​​of each section of the transmission line in the target area without rainfall are extracted.

[0061] The lower limit of the allowable wire spacing in each voltage range is obtained from the local database, and the lower limit of the allowable wire spacing s of each section of the transmission line in the target area without rainfall is mapped. p .

[0062] Calculate the wire shaking accident coefficient of each section of the transmission line in the target area without rainfall

[0063]

[0064] In a specific embodiment of the present invention, the short-circuit threat coefficient of each to-be-analyzed electric wire of each section of the rain-induced power transmission line belonging to the target area is analyzed by a specific analysis method: according to the wind speed value and wind direction of the area where each section of the rain-induced power transmission line belonging to the target area is located, and according to the method of analyzing the wind-induced tripping threat coefficient of the electric wire of each section of the non-rain-induced power transmission line belonging to the target area, the wind-induced tripping threat coefficient D of the electric wire of each section of the rain-induced power transmission line belonging to the target area is analyzed. N, where N represents the number of each section of the rainfall transmission line, N = 1, 2, ..., M, and M is a positive integer greater than 2.

[0065] According to the appearance variation coefficient of each wire in each section of the transmission line in the target area, the appearance variation coefficient C of each wire to be analyzed in each section of the rainfall transmission line in the target area is extracted. NT , where T represents the serial number of each wire to be analyzed in the rainfall transmission line, T = 1, 2, ..., W, and W is a positive integer greater than 2.

[0066] The short-circuit threat coefficient adjustment parameter value corresponding to each rainfall interval is obtained from the local database. According to the rainfall in the area where each section of the rainfall transmission line belongs to the target area, the short-circuit threat coefficient adjustment parameter value E of each section of the rainfall transmission line in the target area is mapped. N .

[0067] It should be noted that the greater the rainfall, the greater the corresponding short-circuit threat coefficient adjustment parameter value.

[0068] Analyze the short-circuit threat coefficient λ of each power line to be analyzed in each section of the rainfall transmission line in the target area NT =C NT +D N +E N .

[0069] In a specific embodiment of the present invention, the short-circuit threatening wires of each section of rainfall-induced transmission line belonging to the target area are screened by a specific screening method as follows: the upper limit value of the allowable rainfall corresponding to each appearance variation coefficient interval is obtained from a local database, and according to the appearance variation coefficient of each wire to be analyzed of each section of rainfall-induced transmission line belonging to the target area, the upper limit value of the allowable rainfall of each wire to be analyzed of each section of rainfall-induced transmission line belonging to the target area is mapped.

[0070] If the rainfall of a certain power line to be analyzed in a certain section of the rainfall transmission line in the target area is greater than the upper limit of the allowable rainfall, the power line to be analyzed will be marked as a short-circuit threat power line.

[0071] The short-circuit threat coefficient threshold of the rainfall transmission line is obtained from the local database. If the short-circuit threat coefficient of a certain wire to be analyzed in a certain section of the rainfall transmission line in the target area is greater than the short-circuit threat coefficient threshold, the wire to be analyzed is marked as a short-circuit threat wire.

[0072] In summary, the short-circuit threatened wires of each section of rainfall transmission line in the target area are summarized.

[0073] The short-circuit hazard prediction unit of the present invention performs short-circuit hazard analysis on each section of the transmission line belonging to the target area according to the rainfall status, and takes into account the hazards of windy tripping during the analysis process, thereby reducing the incidence of short-circuit problems in the transmission lines due to windy tripping, and intelligently analyzes the wires that may have short-circuit problems in the future, thereby reducing the incidence of short-circuit problems in the transmission lines due to high-voltage arcs.

[0074] The short-circuit warning module is used to send each abnormal-appearance electric wire and each short-circuit-threatening electric wire of each section of the transmission line belonging to the target area to the person in charge of transmission line maintenance.

[0075] The short-circuit warning module of the present invention can provide early warning to the person in charge of transmission line maintenance, thereby facilitating the person in charge of transmission line maintenance to perform short-circuit prevention operations, reducing the incidence of transmission line fires, and reducing the scrap rate of transmission lines, thereby improving the safety of power use of transmission lines and improving the transmission efficiency of urban power use.

[0076] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A short circuit fault early warning system for a line, characterized in that: include: The power transmission line analysis unit is used to monitor the appearance of each wire in each section of the power transmission line in the target area through a drone at the current monitoring time point, and screen each wire with abnormal appearance and each wire to be analyzed in each section of the power transmission line in the target area; The short-circuit danger prediction unit is used to obtain the rainfall status of each section of the transmission line belonging to the target area, and perform short-circuit threat analysis on each to-be-analyzed wire of each section of the transmission line belonging to the target area according to the rainfall status, and combine the environmental information of the area where each section of the transmission line belonging to the target area is located, so as to screen each short-circuit threat wire of each section of the transmission line belonging to the target area; The short-circuit warning module is used to send each abnormal-looking wire and each short-circuit-threatening wire of each section of the transmission line in the target area to the person in charge of transmission line maintenance.

2. A short circuit fault early warning system for a line according to claim 1, characterized in that: The transmission line analysis unit includes: a transmission line inspection module and a transmission line appearance damage analysis module; The transmission line inspection module is used to dispatch a drone to monitor each wire of each section of the transmission line belonging to the target area at the current monitoring time point, and obtain the appearance image of each wire of each section of the transmission line belonging to the target area; The transmission line appearance damage analysis module is used to analyze the appearance variation coefficient of each wire in each section of the transmission line belonging to the target area, and screen each wire with abnormal appearance and each wire to be analyzed in each section of the transmission line belonging to the target area.

3. A short-circuit fault early warning system for a line according to claim 2, characterized in that: The specific acquisition method of obtaining the appearance image of each wire of each section of the transmission line belonging to the target area is: The voltage values ​​of each section of the transmission line in the target area and the appropriate distance values ​​between the UAV and the transmission line in each voltage value interval are obtained, and the appropriate distance values ​​of the UAV in each section of the transmission line in the target area are mapped. The UAV is controlled to take all-round photos of each wire at the appropriate distance value from each section of the transmission line in the target area, so as to obtain the appearance image of each wire in each section of the transmission line in the target area.

4. A short-circuit fault early warning system for a line according to claim 3, characterized in that: The specific analysis method of the appearance variation coefficient of each wire of each section of the transmission line in the target area is as follows: According to the appearance image of each section of the transmission line belonging to the target area, the gray value a of each pixel point of the appearance image of each wire of each section of the transmission line belonging to the target area is obtained through grayscale change. xni , where x represents the number of each section of the transmission line, x = 1, 2, ..., y, y is a positive integer greater than 2, n represents the number of each wire, n = 1, 2, ..., m, m is a positive integer greater than 2, i represents the number of each pixel, i = 1, 2, ..., j, j is a positive integer greater than 2; The grayscale variation coefficient decrease compensation value of the camera carried by the UAV in each suitable distance value interval is obtained from the local database. According to the suitable distance value of each section of the transmission line in the target area, the appearance variation coefficient compensation adjustment parameter value c of the UAV in each section of the transmission line in the target area is mapped. x ; Obtain the initial grayscale value b of the wires of each section of the transmission line in the target area from the local database x , calculate the appearance variation coefficient of each wire in each section of the transmission line in the target area Where e is a natural constant.

5. A short-circuit fault early warning system for a line according to claim 3, characterized in that: The short-circuit risk prediction unit includes: a transmission line environment information acquisition module, a rainfall short-circuit threat analysis module, a non-rainfall short-circuit threat analysis module and an abnormal transmission line analysis module; The transmission line environmental information acquisition module is used to obtain the rainfall status of the area where each section of the transmission line in the target area is located during the future target monitoring period from the meteorological management platform, so as to screen each section of the transmission line with rainfall and each section of the transmission line without rainfall in the target area; The short-circuit threat analysis module without rainfall is used to obtain the wind speed value, wind direction, temperature value and humidity value of the area where each section of the transmission line without rainfall in the target area is located from the meteorological management platform, analyze the short-circuit threat coefficient of each wire to be analyzed in each section of the transmission line without rainfall in the target area, and screen each short-circuit threat wire in each section of the transmission line without rainfall in the target area; The rainfall short-circuit threat analysis module is used to obtain the rainfall, wind speed and wind direction of the area where each section of the rainfall power transmission line in the target area is located from the meteorological management platform, analyze the short-circuit threat coefficient of each to-be-analyzed electric wire in each section of the rainfall power transmission line in the target area, and screen each short-circuit threat electric wire in each section of the rainfall power transmission line in the target area; The abnormal transmission line analysis module is used to summarize the short-circuit threatened wires of each section of the transmission line belonging to the target area based on the short-circuit threatened wires of each section of the transmission line without rainfall and the short-circuit threatened wires of each section of the transmission line with rainfall.

6. A short-circuit fault early warning system for a line according to claim 5, characterized in that: The specific analysis method of the short-circuit threat coefficient of each to-be-analyzed electric wire of each section of the transmission line without rainfall in the target area is as follows: According to the wind speed and wind direction of the target area where each section of the transmission line without rainfall is located, the wind tripping threat coefficient δ of the power lines in each section of the target area without rainfall is analyzed. p , where p represents the number of each section of the transmission line without rainfall, p = 1, 2, ..., q, q is a positive integer greater than 2; According to the appearance variation coefficient of each wire in each section of the transmission line in the target area, the appearance variation coefficient A of each wire to be analyzed in each section of the transmission line without rainfall in the target area is extracted. pt , where t represents the serial number of each wire to be analyzed, t = 1, 2, ..., u, and u is a positive integer greater than 2; The short-circuit threat coefficient adjustment parameter values ​​corresponding to each temperature value interval and each humidity value interval are obtained from the local database. According to the temperature value and humidity value of the area where each section of the transmission line without rainfall in the target area is located, the short-circuit threat coefficient adjustment parameter value B of each section of the transmission line without rainfall in the target area is mapped. p ; Analyze the short-circuit threat coefficient of each power line to be analyzed in each section of the transmission line without rainfall in the target area 7. A short-circuit fault early warning system for a line according to claim 6, characterized in that: The specific analysis method of the wind-induced tripping threat coefficient of the power lines in each section of the non-rainfall transmission line in the target area is as follows: Obtain the straight lines formed by the sections of the transmission lines without rainfall in the target area in the extension direction of the power lines from the local database, obtain the straight lines formed by the sections of the transmission lines without rainfall in the target area in the wind direction of the area where the sections of the transmission lines without rainfall are located, calculate the two complementary angles and their degrees between the straight lines formed by the sections of the transmission lines without rainfall in the target area in the extension direction of the power lines and in the wind direction of the area where the sections of the transmission lines without rainfall are located, randomly select one of the angles as the target angle of the sections of the transmission lines without rainfall in the target area, and obtain the degree g of the target angle of the sections of the transmission lines without rainfall in the target area. p ; Obtain the appropriate vertical wind speed value f for each section of the transmission line in the target area without rainfall from the local database p , based on the wind speed value d of the area where each section of the transmission line without rainfall belongs to the target area p , calculate the wind hazard coefficient of each section of the transmission line in the target area without rainfall Calculate the wire shaking accident coefficient ε of each section of the transmission line in the target area without rainfall p ; Analyze the wind tripping threat coefficient φ of the power lines in each section of the target area without rainfall p =δ p +ε p .

8. A short-circuit fault early warning system for a line according to claim 7, characterized in that: The specific calculation method of the wire shaking accident coefficient of each section of the transmission line in the target area without rainfall is as follows: Obtain the number of wires h of each section of the transmission line without rainfall in the target area from the local database p , the actual spacing between wires k p , the length l of each wire to be analyzed pt and the length r between the poles p ; According to the voltage values ​​of each section of the transmission line in the target area, the voltage values ​​of each section of the transmission line in the target area without rainfall are extracted; The lower limit of the allowable wire spacing in each voltage range is obtained from the local database, and the lower limit of the allowable wire spacing s of each section of the transmission line in the target area without rainfall is mapped. p ; Calculate the wire shaking accident coefficient of each section of the transmission line in the target area without rainfall 9. A short-circuit fault early warning system for a line according to claim 5, characterized in that: The specific analysis method of the short-circuit threat coefficient of each to-be-analyzed electric wire of each section of the rainfall transmission line in the target analysis area is as follows: According to the wind speed and wind direction of the area where each section of the target area's rain-prone transmission line is located, and according to the method of analyzing the wind-prone tripping threat coefficient of the wires of each section of the target area's non-rain-prone transmission line, the wind-prone tripping threat coefficient D of the wires of each section of the target area's rain-prone transmission line is analyzed. N , where N represents the number of each section of the rainfall transmission line, N = 1, 2, ..., M, M is a positive integer greater than 2; According to the appearance variation coefficient of each wire in each section of the transmission line in the target area, the appearance variation coefficient C of each wire to be analyzed in each section of the rainfall transmission line in the target area is extracted. NT , where T represents the serial number of each power line to be analyzed in the rainfall transmission line, T = 1, 2, ..., W, W is a positive integer greater than 2; The short-circuit threat coefficient adjustment parameter value corresponding to each rainfall interval is obtained from the local database. According to the rainfall in the area where each section of the rainfall transmission line belongs to the target area, the short-circuit threat coefficient adjustment parameter value E of each section of the rainfall transmission line in the target area is mapped. N ; Analyze the short-circuit threat coefficient λ of each power line to be analyzed in each section of the rainfall transmission line in the target area NT =C NT +D N +E N .

10. A short-circuit fault early warning system for a line according to claim 9, characterized in that: The specific screening method of the short-circuit threat wires of each section of the rainfall transmission line in the screening target area is as follows: The upper limit value of the allowable rainfall corresponding to each appearance variation coefficient interval is obtained from the local database, and the upper limit value of the allowable rainfall of each to-be-analyzed electric wire of each section of the rainfall transmission line belonging to the target area is mapped according to the appearance variation coefficient of each to-be-analyzed electric wire of each section of the rainfall transmission line belonging to the target area; If the rainfall of a certain power line to be analyzed in a certain section of the rain-transmission line in the target area is greater than the upper limit of the allowable rainfall, the power line to be analyzed is marked as a short-circuit threat power line; The short-circuit threat coefficient threshold of the rainfall transmission line is obtained from the local database. If the short-circuit threat coefficient of a certain power line to be analyzed in a certain section of the rainfall transmission line in the target area is greater than the short-circuit threat coefficient threshold, the power line to be analyzed is marked as a short-circuit threat power line; In summary, the short-circuit threatened wires of each section of rainfall transmission line in the target area are summarized.

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