A method for long-distance transmission state monitoring of a power transmission line

Abstract

The application is a kind of power transmission line long-distance transmission state monitoring method, relating to the technical field of power transmission line monitoring, comprising: environment judgment; air monitoring; ground monitoring; combined analysis: after comprehensive processing of insulator evaluation coefficient, wire evaluation coefficient and ground evaluation coefficient, risk evaluation coefficient is obtained; state judgment. In the application, the influence of natural environmental factors on the power transmission line is comprehensively considered, environmental information is obtained through various sensors and monitoring equipment, and the insulators, wires and ground environment of the power transmission line are comprehensively monitored, which can cover the main influencing factors in the operation process of the power transmission line, realize the all-round monitoring of the state of the power transmission line; through detailed analysis of various parameters of the insulators, wires and ground environment, the actual operation state and potential risks of the power transmission line can be accurately reflected, and the accuracy and reliability of the evaluation are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission line monitoring, and particularly relates to a power transmission line long-distance transmission state monitoring method. BACKGROUND

[0002] With the rapid development of the power industry, the scale of power transmission lines is continuously expanding, and long-distance power transmission has become an important way to ensure power supply. However, during the operation of the power transmission line, it will be affected by various natural environmental factors, such as rain, snow, hail, wind, lightning, etc., and the insulators, wires and ground foundations of the line itself will also age, be damaged and have other problems over time. Once the power transmission line fails, not only will it affect the normal supply of electricity, but it may also cause serious safety accidents, resulting in huge economic losses and social impact.

[0003] At present, although there are some power transmission line monitoring methods, they mostly have problems such as incomplete monitoring, low accuracy, and inability to timely warning.

[0004] For example, existing environmental monitoring methods may not be able to accurately determine the degree of influence of adverse weather on the power transmission line, making it difficult to trigger targeted monitoring in advance; for the state monitoring of insulators and wires, there is a lack of effective multi-parameter comprehensive evaluation method, which cannot accurately reflect the actual state; ground environment monitoring is often not detailed enough to timely discover potential problems of the tower foundation.

[0005] Therefore, a power transmission line long-distance transmission state monitoring method is needed to address the above-mentioned problems. SUMMARY

[0006] The purpose of the present application is to solve the above-mentioned problems by providing a power transmission line long-distance transmission state monitoring method.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] A power transmission line long-distance transmission state monitoring method, comprising:

[0009] environmental judgment: based on the trigger coefficient obtained by analyzing the natural environmental parameter information, to trigger the state monitoring of the power transmission line, including the aerial monitoring and ground monitoring of the power transmission line;

[0010] aerial monitoring: collecting relevant information of the insulators and wires of the power transmission line respectively, and analyzing to obtain an insulator evaluation coefficient and a wire evaluation coefficient;

[0011] ground monitoring: processing the ground environmental information of the power transmission line to obtain a ground evaluation coefficient;

[0012] Combination analysis: the insulator evaluation coefficient, the wire evaluation coefficient and the ground evaluation coefficient are comprehensively processed to obtain a risk evaluation coefficient;

[0013] State judgment: the risk level of the power transmission line is evaluated based on the risk evaluation coefficient.

[0014] Preferably, the environment judgment specifically comprises the following parts:

[0015] The power transmission line is regionally divided according to a preset area, and the natural environment parameter information of each region is obtained; the natural environment parameter information includes rain, snow, hail, wind and lightning;

[0016] The monitoring values of each parameter are obtained at a preset time interval, and the allowable range of each parameter is preset; the monitoring values of each parameter are compared with the corresponding allowable range, the parameters not in the allowable range are marked as deviation parameters, and the deviation values are obtained by difference calculation between the monitoring values of the deviation parameters and the values corresponding to the maximum allowable range in the allowable range of the parameter;

[0017] The deviation values of each parameter are weighted to obtain a trigger coefficient;

[0018] A preset trigger coefficient threshold is compared with the trigger coefficient, and if the trigger coefficient is greater than the preset trigger coefficient threshold, the state monitoring of the power transmission line is triggered.

[0019] Preferably, the process of obtaining the insulator evaluation coefficient comprises:

[0020] An initial position image of the insulator when it is put into use is extracted, and the image contains insulator marks and tower marks; the marks of the insulator and the tower are connected in a straight line, the straight line is marked as a calibration line, and the size of the calibration line is obtained and marked as the calibration line length;

[0021] When the state monitoring of the power transmission line is triggered, the insulator comparison image at this time is obtained, and the calibration line is extracted from the insulator comparison image;

[0022] The end of the calibration line in the insulator comparison image is overlapped with the end of the corresponding calibration line in the initial position image of the insulator, and the insulators in the two images are also overlapped; the included angle between the two calibration lines is obtained and marked as the deviation degree;

[0023] When the insulator mark point in the insulator comparison image cannot be recognized, the initial position image of the insulator is overlapped with the insulator comparison image, and the comparison degree is obtained by dividing the area of the insulator comparison image by the area of the initial position image of the insulator;

[0024] Calculate the calibration line length in the insulator comparison image and the insulator initial position image respectively, and calculate the difference between the calibration line lengths in the insulator comparison image and the insulator initial position image to obtain the line length deviation;

[0025] Obtain images of each angle of the insulator, pre-process the images, construct a three-dimensional image of the insulator, extract the damage and crack features in the images of each angle, and mark the regions where the damage features and crack features are located to obtain the damage region and crack region;

[0026] Mark the contours of each damage region and crack region in the three-dimensional image of the insulator;

[0027] Arrange each damage region and crack region in descending order according to the size of the region, and extract the largest damage region and the largest crack region; obtain the two ends of the crack corresponding to the largest crack region and the approximate center point of the largest damage region;

[0028] Connect the two ends of the crack corresponding to the largest crack region and the approximate center point of the largest damage region with a straight line to form a triangular model, and calculate the area of the triangular model, denoted as the breakage value;

[0029] After comprehensive processing of the deviation degree, comparison degree, line length deviation and breakage value, the insulator evaluation coefficient is obtained.

[0030] Preferably, the process of obtaining the wire evaluation coefficient comprises:

[0031] Obtain image information of the wire at preset time intervals, and project the wire images obtained at each time interval onto the same horizontal plane; and the projection of the wire that remains in the same position within the preset time length on the horizontal plane is taken as the reference wire;

[0032] Arrange a preset number of connection points on the projection of the wire on the horizontal plane, and make a connection line perpendicular to the reference wire from the connection point as the starting point, and arrange the obtained connection lines in descending order according to the length value, and extract the connection line with the maximum length as the swing line length;

[0033] Obtain the swing line length corresponding to the projection of the wire on the plane at each time interval, and obtain the swing average line length by averaging all the swing line lengths;

[0034] When the atmospheric temperature is within a preset range, obtain the contour of the reference wire, and obtain the distance between the contours on both sides of the reference wire, denoted as the standard line width;

[0035] Obtain the projection of the wire on the horizontal plane at each time interval, and obtain the average value of the line width corresponding to the contour of each wire projection to obtain the monitoring line width;

[0036] The line width variation value is obtained by subtracting the standard line width from the monitored line width;

[0037] An allowable fluctuation range of the preset line width variation value is set, and if the line width variation value is not within the allowable fluctuation range, the line width variation value is recorded as an abnormal line width value; and at this time, the lowest point of the electric wire is monitored to obtain a falling value;

[0038] The electric wire evaluation coefficient is obtained by weighted calculation of the swing average line length, the abnormal line width value and the falling value.

[0039] Preferably, the process of obtaining the ground evaluation coefficient comprises:

[0040] A preset number of monitoring poles are arranged in each divided area of the power transmission line, and each monitoring pole is provided with a predetermined water level height marker and a water level height value of each monitoring pole at an initial time, image information of the monitoring pole is obtained at a preset time interval, and the water level height value is obtained according to the exposed water level height marker;

[0041] The water level height values monitored by each monitoring pole in the area are obtained, and each water level height value is subtracted from the initial water level height value to obtain a height difference value;

[0042] An allowable range corresponding to the preset height difference value is set, and the height difference value is compared with the allowable range corresponding to the preset height difference value, and the height difference value not within the allowable range corresponding to the preset height difference value is recorded as an abnormal height difference value;

[0043] The abnormal height difference values are arranged in descending order according to the numerical value, and the three largest abnormal height difference values are extracted;

[0044] The positions of the monitoring poles corresponding to the three largest abnormal height difference values are respectively taken as the centers of the circles, and the three largest abnormal height difference values are respectively taken as the radii to make circles, and three circles with the monitoring poles as the centers are respectively obtained; lines tangent to any two of the three circles are respectively drawn, and three circle tangent lines are obtained, a triangle formed by the three circle tangent lines is obtained, the area of the triangle is calculated and recorded as a water level difference approximation value.

[0045] Preferably, the process of obtaining the ground evaluation coefficient further comprises:

[0046] Image information of the initial position of the tower foundation surface is obtained, and the cracks in the initial position image information are marked and recorded as foundation cracks; and a contrast mark point is made on the tower to determine the positions of the foundation cracks;

[0047] Image information of each foundation crack and a reference circle corresponding to each foundation crack are obtained at a preset time point;

[0048] A circle with a preset radius is made in the foundation crack to obtain a preset number of circles, the overlapping degrees of each circle and the foundation crack are obtained, the circles are arranged in descending order according to the sizes of the overlapping degrees, and the circle corresponding to the maximum overlapping degree is marked as a reference circle;

[0049] The center of the reference circle at the initial position and the center of the reference circle obtained at a preset time point after the time point corresponding to the initial position are obtained, and the centers of the reference circles are connected by a straight line to obtain an offset amount, a preset offset amount threshold is set, and if the offset amount is greater than the offset amount threshold, the offset amount is recorded as an offset loss amount;

[0050] Each offset loss amount and the center of the corresponding circle are obtained, the centers of the corresponding circles are connected by a straight line to form a complete and closed figure, and the figure is the largest closed figure that can be formed; the area of the closed figure is calculated and recorded as an offset actual value;

[0051] The water level difference approximation value and the offset actual value are comprehensively processed to obtain a ground evaluation coefficient.

[0052] Preferably, the insulator evaluation coefficient, the wire evaluation coefficient and the ground evaluation coefficient are comprehensively processed to obtain a risk evaluation coefficient, and specifically comprising:

[0053] After the insulator evaluation coefficient, the wire evaluation coefficient and the ground evaluation coefficient are normalized, the insulator evaluation coefficient and the wire evaluation coefficient are respectively taken as two legs of a right triangle, and the remaining leg is connected to obtain a complete right triangle, the right triangle is taken as the base of a triangular pyramid, the ground evaluation coefficient is taken as the height of the triangular pyramid, a triangular pyramid model is established, the volume of the triangular pyramid is calculated, and recorded as a risk evaluation coefficient.

[0054] Preferably, the risk level of the power transmission line is evaluated based on the risk evaluation coefficient, comprising evaluating the risk level of the risk evaluation coefficient of each region of the power transmission line.

[0055] Three groups of threshold value ranges are preset, each group of threshold value range corresponds to a risk level, the risk evaluation coefficient is matched with the three groups of threshold value ranges to obtain the risk level corresponding to the risk evaluation coefficient, and the risk level includes normal, abnormal and emergency.

[0056] As described above, due to the adoption of the above technical solutions, the present application has the following advantages:

[0057] 1、The application can realize all-around monitoring of the state of the power transmission line by comprehensively considering the influence of natural environmental factors on the power transmission line, obtaining environmental information through various sensors and monitoring devices, and comprehensively monitoring the insulators, electric wires and ground environment of the power transmission line, so as to cover the main influencing factors in the operation process of the power transmission line; the actual operation state and potential risks of the power transmission line can be accurately reflected by detailed analysis of various parameters of the insulators, electric wires and ground environment, so as to improve the accuracy and reliability of the evaluation.

[0058] 2、The application can timely judge the risk level of the power transmission line by comparing the risk evaluation coefficient with the preset threshold value, and timely issue a warning when the risk level reaches an abnormal or emergency state, so that the staff can take corresponding measures for processing, avoid the occurrence of faults, and ensure the safe and stable operation of the power transmission line. BRIEF DESCRIPTION OF DRAWINGS

[0059] In the following description of exemplary embodiments in conjunction with the attached drawings, more details, features and advantages of the application are disclosed, in which:

[0060] Figure 1 The method flowchart of the application. DETAILED DESCRIPTION

[0061] Several embodiments of the application will be described in more detail below with reference to the attached drawings, so that those skilled in the art can implement the application. The application can be embodied in many different forms and purposes and should not be limited to the embodiments described herein. These embodiments are provided to make the application comprehensive and complete, and to fully convey the scope of the application to those skilled in the art. The embodiments do not limit the application.

[0062] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and / or the present specification, and should not be interpreted in an idealized or overly formal sense, unless expressly so defined herein. EMBODIMENTS

[0063] The detailed description is combined with the accompanying drawings Figure 1 are described in detail.

[0064] The accompanying drawings Figure 1 A power transmission line long-distance transmission state monitoring method flowchart provided by the embodiment of the application shows the complete steps from environment judgment to state judgment.

[0065] In this embodiment, it includes:

[0066] Environment judgment: based on the trigger coefficient obtained by analyzing the natural environment parameter information, to trigger the state monitoring of the power transmission line, including the aerial monitoring and ground monitoring of the power transmission line;

[0067] The environment judgment specifically includes the following parts:

[0068] According to the preset area, the power transmission line is regionally divided, and the natural environment parameter information of each region is obtained; the natural environment parameter information includes: rain and snow, hail, wind, lightning.

[0069] Rain and snow sensor: optical rain and snow sensor detects whether there are rain and snow particles by emitting and receiving light signals. When rain and snow particles enter the detection area, they will scatter or block light, causing the received light signal to change, thereby judging the state of rain and snow. Capacitive rain and snow sensor detects rain and snow by using the influence of rain and snow on the medium between the capacitor plates. When rain and snow contacts the capacitor plates of the sensor, it will change the capacitance value between the plates, and the change in capacitance value is measured to determine whether there is rain and snow and the intensity of the rain and snow. There is also a weighing type rain and snow sensor, which determines the precipitation of rain and snow by measuring the weight of collected rain and snow.

[0070] Weather radar: Doppler weather radar emits electromagnetic waves into the air. When the electromagnetic waves encounter precipitation particles such as hail, they will be reflected and scattered. The radar receives the reflected signals and analyzes parameters such as signal strength, speed, and spectral width to identify and track the development of hail clouds and information such as hail size, location, and movement direction. Generally, hail clouds will show some characteristics on the radar echo map, such as strong echo area, high echo top, and obvious three-body scattering.

[0071] Wind sensor: common wind sensors include mechanical and electronic types; mechanical wind sensors usually use wind cups or propellers to measure wind speed by rotating in the wind, and convert the rotation into electrical signals through mechanical transmission devices. Electronic wind sensors measure wind speed based on ultrasonic wave, heat transfer or pressure difference principles.

[0072] For example, ultrasonic wind speed sensors calculate wind speed by measuring the time difference of ultrasonic wave propagation in air; thermal wind speed sensors use the heat dissipation characteristics of heating elements in airflow to measure wind speed. Wind direction measurement is generally achieved by using a wind vane, which rotates with the change of wind direction, and the rotation angle is converted into an electrical signal through a potentiometer or encoder device to determine the wind direction.

[0073] Ground lightning positioning system: use the electromagnetic radiation generated by lightning to determine the location of lightning; when lightning occurs, a strong current is generated, thereby radiating low-frequency electromagnetic waves. After multiple detection stations distributed on the ground receive these electromagnetic wave signals, the location of the lightning can be calculated according to the time difference of the signals arriving at different detection stations and the propagation speed of the electromagnetic waves.

[0074] Obtain the monitoring values of each parameter at a preset time interval, and preset the allowable range of each parameter. Compare the monitoring values of each parameter with the corresponding allowable range, mark the parameters that are not within the allowable range as deviation parameters, and calculate the deviation value of the monitoring value of the deviation parameter and the value corresponding to the maximum allowable range in the allowable range of the parameter.

[0075] Calculate the deviation value of each parameter to obtain the trigger coefficient;

[0076] Respectively preset the weight factor of each parameter, and respectively multiply each parameter and its corresponding weight factor to obtain the trigger coefficient after summation;

[0077] Preset the trigger coefficient threshold, compare the trigger coefficient with the preset trigger coefficient threshold, and if the trigger coefficient is greater than the preset trigger coefficient threshold, trigger the state monitoring of the power transmission line.

[0078] Air monitoring: collect relevant information of insulators and wires of the power transmission line respectively, and analyze to obtain insulator evaluation coefficient and wire evaluation coefficient.

[0079] The process of obtaining the insulator evaluation coefficient includes:

[0080] Marking on the insulator by laser marking, and corresponding markers are also arranged on the tower;

[0081] Image shooting can be performed by unmanned aerial vehicle or fixed-point camera installed in the layout area of the power transmission line; marking on the insulator by laser marking, and corresponding markers are also arranged on the tower. The purpose of this is to have a clear reference point in the subsequent image collection and analysis process.

[0082] Image shooting can be performed by unmanned aerial vehicle or fixed-point camera installed in the layout area of the power transmission line. Unmanned aerial vehicle can flexibly shoot insulator images from different angles, while fixed camera can continuously monitor insulator state from specific position. The images should contain insulator markers and tower markers for subsequent calibration and analysis.

[0083] Extract the initial position image of the insulator when it is put into use, and the image contains insulator marks and tower marks; connect the insulator marks and the tower marks with a straight line, mark the straight line as a calibration line, and obtain the size of the calibration line as the calibration line length;

[0084] Extract the initial position image of the insulator when it is put into use. In the image, connect the insulator marks and the tower marks to form a calibration line, and obtain the length of the calibration line. This calibration line serves as the reference for subsequent comparison, and its length is an important reference data;

[0085] When the state monitoring of the power transmission line is triggered, the initial position image of the insulator is taken at the same position and lens angle as the initial position image, and the insulator comparison image at this time is obtained, and the calibration line is extracted from the insulator comparison image;

[0086] Overlap one end of the calibration line in the insulator comparison image with the corresponding end of the calibration line in the initial position image of the insulator, and overlap the insulators in the two images; obtain the included angle between the two calibration lines, and mark it as the deviation degree;

[0087] When the insulator mark point in the insulator comparison image cannot be recognized, overlap the initial position image of the insulator with the insulator comparison image, and divide the area of the insulator comparison image by the area of the initial position image of the insulator to obtain the comparison degree;

[0088] When the state monitoring of the power transmission line is triggered, the initial position image of the insulator is taken at the same position and lens angle as the initial position image, and the insulator comparison image is obtained. The calibration line is also extracted from the comparison image. In this way, image comparison can be performed under the same observation conditions, improving the accuracy and comparability of the data.

[0089] Overlap one end of the calibration line in the comparison image with the corresponding end of the calibration line in the initial position image, and overlap the insulators in the two images. In this way, the included angle between the two calibration lines, i.e. the deviation degree, is obtained. The deviation degree reflects the deviation of the insulator relative to the initial position during use, and the larger the angle, the more serious the deviation;

[0090] When the insulator mark point in the insulator comparison image cannot be recognized, overlap the initial position image with the comparison image. The comparison degree is obtained by dividing the area of the insulator comparison image by the area of the initial position image. The comparison degree can measure the size change of the insulator in the image, and the larger the area change, the greater the difference between the comparison degree and 1, which may indicate that the insulator has deformed or changed position;

[0091] Calculate the length of the calibration line in the insulator comparison image and the initial position image of the insulator respectively, and calculate the difference between the lengths of the calibration lines in the insulator comparison image and the initial position image of the insulator to obtain the line length deviation;

[0092] acquire images of each angle of the insulator, and after pre-processing the images, construct a three-dimensional image of the insulator, extract the damage and crack features in the images of each angle, and mark the regions where the damage features and crack features are located to obtain damage regions and crack regions;

[0093] wherein the construction of the three-dimensional image of the insulator based on the images of each angle of the insulator is a direct reference to the prior art, mainly including image acquisition, preprocessing, feature extraction and matching, three-dimensional reconstruction and other steps, which will not be repeated here;

[0094] outline mark each damage region and crack region in the three-dimensional image of the insulator;

[0095] respectively arrange each damage region and crack region in descending order according to the size of the region, and extract the largest damage region and the largest crack region; obtain the two ends of the crack corresponding to the largest crack region and the approximate center point of the largest damage region;

[0096] connect the two ends of the crack corresponding to the largest crack region and the approximate center point of the largest damage region with a straight line, thereby forming a triangular model, calculate the area of the triangular model, and record it as a break value;

[0097] After comprehensive processing of the deviation degree, the comparison degree, the line length deviation and the break value, an insulator evaluation coefficient is obtained;

[0098] After normalizing the deviation degree, the comparison degree, the line length deviation and the break value, the product between the deviation degree and the comparison degree is taken as one of the right angle sides of the triangle, the product between the line length deviation and the break value is taken as the other right angle side of the triangle, and the remaining one side is connected to form a complete right triangle, and the area of the right triangle is recorded as the insulator evaluation coefficient.

[0099] The acquisition process of the wire evaluation coefficient includes:

[0100] acquire image information of the wire at preset time intervals, and project the wire images acquired at each time interval onto the same horizontal plane; and take the projection of the wire that remains in the same position within the preset time length on the horizontal plane as a reference wire;

[0101] arrange a preset number of connection points on the projection of the wire on the horizontal plane, and make a connection line perpendicular to the reference wire from the connection point as a starting point, and arrange the obtained connection lines in descending order according to the length values, and extract the connection line with the largest length as a swing line length;

[0102] acquire the swing line length corresponding to the projection of the wire on the plane at each time interval, and obtain the swing average line length by averaging all the swing line lengths.

[0103] When the atmospheric temperature is in the preset range, the profile of the reference electric wire is acquired, and the distance between the profiles on both sides of the reference electric wire is acquired, denoted as a standard line width;

[0104] At this time, the outer wall of the profile of the reference electric wire acquired is not in an icing or snow-covered state, and changes in the thickness of the electric wire caused by icing or snow covering of the reference electric wire can be avoided;

[0105] The projections of the electric wires acquired at each time interval on the horizontal plane are acquired respectively, and the line widths corresponding to the profiles of the projections of each electric wire are calculated by averaging to obtain a monitoring line width;

[0106] The monitoring line width and the standard line width are calculated by difference to obtain a line width change value;

[0107] A preset allowable fluctuation range of the line width change value is set, and if the line width change value is not in the preset allowable fluctuation range of the line width change value, the line width change value is recorded as an abnormal line width value; and at this time, the lowest point of the electric wire is monitored to obtain a falling value;

[0108] The acquisition of the falling value includes: extracting an initial position image of the electric wire of the power transmission line in the region after laying, and acquiring position images of the electric wire at preset time intervals, denoted as comparison position images of the electric wire;

[0109] The electric wire profiles in the comparison position images of the electric wire and the initial position images of the electric wire are extracted respectively, and the distance between the two electric wire profiles is calculated, denoted as a profile distance difference value;

[0110] The electric wire profile distance difference values corresponding to each time interval are acquired, and the obtained profile distance difference values are arranged in descending order according to the numerical values, and the largest profile distance difference value is extracted, denoted as a falling value;

[0111] The swing average line length, the abnormal line width value and the falling value are calculated by weighting to obtain an electric wire evaluation coefficient;

[0112] The weights of the swing average line length, the abnormal line width value and the falling value are preset, and the swing average line length, the abnormal line width value and the falling value are multiplied by the corresponding weights to obtain the electric wire evaluation coefficient.

[0113] Ground monitoring: processing ground environmental information of the power transmission line to obtain a ground evaluation coefficient;

[0114] The acquisition process of the ground evaluation coefficient includes:

[0115] The preset number of monitoring poles are arranged in each divided area of the power transmission line, and each monitoring pole is provided with a predetermined water level height mark and a water level height value of each monitoring pole at an initial time, image information of the monitoring pole is acquired at a preset time interval, and a water level height value is acquired according to the exposed water level height mark; wherein the monitoring pole can be arranged at four corner points and a center position of a tower foundation;

[0116] The water level height values monitored by each monitoring pole in the area are acquired, and each water level height value is subjected to difference calculation with the initial water level height value to obtain a height difference value;

[0117] A preset height difference value corresponding to an allowable range is compared with the height difference value, and the height difference value not in the preset height difference value corresponding to the allowable range is recorded as an abnormal height difference value;

[0118] Each abnormal height difference value is arranged in descending order according to the value, and the maximum three abnormal height difference values are extracted;

[0119] The monitoring pole positions corresponding to the maximum three abnormal height difference values are respectively taken as the centers of circles, and the maximum three abnormal height difference values are taken as the radii to make circles, respectively, to obtain three circles with the monitoring pole as the center corresponding to the circles; lines tangent to any two circles in the three circles are respectively made, to obtain three circle tangent lines, a triangle formed by the three circle tangent lines is obtained, the area of the triangle is calculated and recorded as a water level difference approximation value.

[0120] Image information of an initial position of a tower foundation surface is acquired, and a crack in the initial position image information is marked and recorded as a foundation crack; and a contrast mark point is made on the tower to determine the position of each foundation crack;

[0121] Image information of each foundation crack is acquired at a preset time point, and a reference circle corresponding to each foundation crack is acquired;

[0122] A circle is made in the foundation crack with a preset radius to obtain a preset number of circles, the overlapping degrees of each circle and the foundation crack are acquired, the overlapping degrees are arranged in descending order according to the size, and the circle corresponding to the maximum overlapping degree is marked as a reference circle;

[0123] The center of the reference circle of the initial position and the center of the reference circle acquired at a preset time point after the time corresponding to the initial position are obtained; the centers of each reference circle are connected by a straight line to obtain a displacement, a preset displacement threshold value is set, and if the displacement is greater than the displacement threshold value, the displacement is recorded as a displacement loss;

[0124] Obtaining each offset amount and the center of the corresponding circle; connecting the center of the circle corresponding to each offset amount with a straight line to form a complete and closed figure, and the figure is the largest closed figure that can be formed; calculating the area of the closed figure, denoted as the offset actual value.

[0125] After the water level difference approximation value and the offset actual value are comprehensively processed, a ground evaluation coefficient is obtained.

[0126] The water level difference approximation value and the offset actual value are respectively marked as and After the water level difference approximation value and the offset actual value are comprehensively processed, a ground evaluation coefficient is obtained.

[0127] , a ground evaluation coefficient is obtained; wherein and are the maximum water level difference approximation value and the maximum allowable value of the offset actual value, respectively; and are the weight factors corresponding to the water level difference approximation value and the offset actual value, respectively.

[0128] Combined analysis: after the insulator evaluation coefficient, the wire evaluation coefficient and the ground evaluation coefficient are comprehensively processed, a risk evaluation coefficient is obtained.

[0129] Specifically includes:

[0130] After the insulator evaluation coefficient, the wire evaluation coefficient and the ground evaluation coefficient are normalized, the insulator evaluation coefficient and the wire evaluation coefficient are respectively taken as two legs of a right triangle, and the remaining leg is connected to obtain a complete right triangle. The right triangle is taken as the base surface of a triangular pyramid, the ground evaluation coefficient is taken as the height of the triangular pyramid, a triangular pyramid model is established, the volume of the triangular pyramid is calculated, and is denoted as the risk evaluation coefficient.

[0131] State judgment: based on the risk evaluation coefficient, the risk level of the transmission line is evaluated.

[0132] Based on the risk evaluation coefficient, the risk level of the transmission line is evaluated, including the risk level evaluation of the risk evaluation coefficient of each region of the transmission line.

[0133] Three groups of threshold value ranges are preset, each threshold value range corresponds to a risk level, the risk evaluation coefficient is matched with the threshold value ranges of the three groups, and the risk level corresponding to the risk evaluation coefficient is obtained, wherein the risk level includes normal, abnormal and urgent.

[0134] When the risk level is normal: the existing monitoring frequency and mode are maintained, and the environmental parameters, insulators, wires and ground states of the transmission line and other data are continuously collected.

[0135] When the risk level is abnormal: increase the monitoring frequency, increase the number of inspections of the relevant area, and use multiple monitoring methods for key monitoring; for example, for insulators and power lines, increase the frequency of unmanned aerial vehicle inspections; for the ground environment, more frequently check the water level of the monitoring pole and the tower foundation crack situation; send real-time warning information to the relevant operation and maintenance departments and personnel to inform the abnormal situation and potential risks of the power transmission line, and remind to prepare for emergencies, so as to respond quickly when the abnormal situation further deteriorates;

[0136] When the risk level is urgent: under the premise of ensuring safety, promptly power off the power transmission line with urgent risks to prevent the fault from expanding and causing more serious consequences and to ensure the safety of personnel and equipment; establish a field command center to coordinate various forces to ensure that the repair work is carried out efficiently and orderly. The command center needs to keep abreast of the progress of the repair work, timely solve problems encountered during the repair process, and maintain close communication with the power dispatching department to reasonably arrange the power-off and power restoration time.

[0137] The above formulas are obtained by collecting a large amount of data for software simulation and selecting a formula close to the true value, and the influence weight factor and specific coefficient value in the formula are set by the person skilled in the art according to the actual situation, which can be adjusted and modified later.

[0138] The above embodiments can be realized wholly or partially by software, hardware, firmware or any other combination. When realized by software, the above embodiments can be realized wholly or partially in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present application are wholly or partially generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices.

[0139] The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through wired or wireless (such as infrared, wireless, microwave, etc.) mode.

[0140] The computer-readable storage medium can be any available medium accessible by a computer or a data storage device such as a server, data center, etc. containing a set of one or more available media. The available media can be magnetic media, optical media or semiconductor media. The semiconductor medium can be a solid state disk.

[0141] It should be understood that the term "and / or" in this document merely describes an associated relationship, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In addition, the character " / " in this document generally represents an "or" relationship between the front and rear associated objects, but it can also represent an "and / or" relationship. The specific meaning can be understood according to the context before and after.

[0142] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways.

[0143] For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0144] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0145] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0146] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the part of the present application which essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of software products, which are stored in a storage medium and include a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application.

[0147] The storage medium mentioned above includes: a USB flash disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and various storage medium which can store program codes.

[0148] The foregoing description of the embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of monitoring the state of a long distance transmission line, characterized in that, Comprise: Environment judgment: based on the trigger coefficient obtained by analyzing the natural environment parameter information, to trigger the state monitoring of the power transmission line, including the aerial monitoring and ground monitoring of the power transmission line; Specifically comprising the following parts: According to the preset area, the power transmission line is regionally divided, and the natural environment parameter information of each region is obtained; the natural environment parameter information includes: rain, snow, hail, wind, lightning; Obtain the monitoring value of each parameter at a preset time interval, and preset the allowable range of each parameter, compare the monitoring value of each parameter with the corresponding allowable range, mark the parameters not in the allowable range as deviation parameters, and calculate the deviation value of the monitoring value of the deviation parameter and the value corresponding to the maximum allowable range in the allowable range of the parameter; The trigger coefficient is obtained by weighting the deviation value of each parameter; Preset trigger coefficient threshold, compare the trigger coefficient with the preset trigger coefficient threshold, if the trigger coefficient is greater than the preset trigger coefficient threshold, the state monitoring of the power transmission line is triggered; Aerial monitoring: collect the relevant information of insulator and wire of power transmission line respectively, and analyze to obtain insulator evaluation coefficient and wire evaluation coefficient; The process of obtaining insulator evaluation coefficient includes: Extract the initial position image of insulator when it is put into use, and the image contains insulator mark and tower mark; connect the mark points of insulator and tower with a straight line, and record the straight line as calibration line, and obtain the size of calibration line as calibration line length; When the state monitoring of the power transmission line is triggered, the insulator comparison image at this time is obtained, and the calibration line is extracted from the insulator comparison image; Overlap one end of the calibration line in the insulator comparison image with the corresponding end of the calibration line in the initial position image of the insulator, and overlap the insulator in the two images; obtain the included angle between the two calibration lines, and record it as the deviation degree; When the insulator mark point in the insulator comparison image cannot be recognized, overlap the insulator initial position image with the insulator comparison image, and divide the area of the insulator comparison image by the area of the insulator initial position image to obtain the comparison degree; Calculate the calibration line length in the insulator comparison image and the initial position image of the insulator respectively, and calculate the difference between the calibration line length in the insulator comparison image and the initial position image of the insulator to obtain the line length deviation; Obtain the image of each angle of the insulator, pre-process the image, construct the three-dimensional image of the insulator, extract the damage and crack features in the image of each angle, and mark the regions where the damage and crack features are located to obtain the damage region and crack region; Mark the contour of each damage region and crack region in the three-dimensional image of the insulator; Arrange each damage region and crack region in descending order according to the size of the region, and extract the largest damage region and the largest crack region; obtain the two ends of the crack corresponding to the largest crack region and the approximate center point of the largest damage region; Connecting two ends of the crack corresponding to the maximum crack area and the approximate center point of the maximum damage area with a straight line to form a triangular model, calculating the area of the triangular model as a crack value; Comprehensively processing the deviation degree, the comparison degree, the line length deviation, and the crack value to obtain an insulator evaluation coefficient; Ground monitoring: processing ground environment information of the transmission line to obtain a ground evaluation coefficient; Combined analysis: comprehensively processing the insulator evaluation coefficient, the wire evaluation coefficient, and the ground evaluation coefficient to obtain a risk evaluation coefficient; State judgment: performing risk level evaluation on the transmission line based on the risk evaluation coefficient.

2. A method of monitoring the condition of a power line at a remote location according to claim 1, wherein The process of obtaining the wire evaluation coefficient includes: Obtaining image information of the wire at preset time intervals, and projecting the wire images obtained at each time interval onto the same horizontal plane; and taking the projection of the wire that remains at the same position within a preset time length on the horizontal plane as a reference wire; Arranging a preset number of connection points on the projection of the wire on the horizontal plane, and taking the connection points as starting points to draw connection lines perpendicular to the reference wire, arranging the obtained connection lines in descending order according to length values, and extracting the connection line with the maximum length as a swing line length; Obtaining the swing line length corresponding to the projection of the wire on the plane at each time interval, and obtaining the swing average line length by averaging all the swing line lengths; When the atmospheric temperature is within a preset range, obtaining the contour of the reference wire, and obtaining the distance between the contours on both sides of the reference wire as a standard line width; Obtaining the projection of the wire on the horizontal plane at each time interval, and obtaining the line width corresponding to the contour of each wire projection by averaging to obtain a monitoring line width; Calculating the difference between the monitoring line width and the standard line width to obtain a line width change value; Setting an allowable fluctuation range of the preset line width change value, if the line width change value is not within the allowable fluctuation range of the preset line width change value, the line width change value is recorded as an abnormal line width value; and at this time, triggering monitoring of the lowest point of the wire to obtain a falling value; Obtaining the wire evaluation coefficient by weighted calculation of the swing average line length, the abnormal line width value, and the falling value.

3. A method for monitoring the state of a long distance transmission line according to claim 1, characterized in that, The process of obtaining the ground evaluation coefficient includes: Arranging a preset number of monitoring rods in each divided area of the transmission line, and setting a predetermined water level height mark and a water level height value of each monitoring rod at an initial time on each monitoring rod, obtaining image information of the monitoring rod at preset time intervals, and obtaining the water level height value according to the exposed water level height mark; Obtaining the water level height values monitored by each monitoring rod in the area, and calculating the height difference value by calculating the difference between each water level height value and the initial water level height value; Setting an allowable range corresponding to the preset height difference value, comparing the height difference value with the allowable range corresponding to the preset height difference value, and recording the height difference value that is not within the allowable range corresponding to the preset height difference value as an abnormal height difference value; Arranging each abnormal height difference value in descending order according to the value, and extracting the maximum three abnormal height difference values; respectively, the maximum three abnormal height difference values are taken as radii to draw three circles respectively; lines are drawn tangent to any two circles of the three circles respectively, and three tangent lines are obtained, and a triangle is formed by the three tangent lines, and the area of the triangle is calculated and recorded as a water level difference approximation value.

4. A method of monitoring the condition of a power line at a remote location according to claim 3, wherein The obtaining process of the ground evaluation coefficient further includes: obtaining image information of an initial position of a tower foundation surface, and marking cracks in the initial position image information as foundation cracks; and marking points on the tower for comparison to determine the positions of the foundation cracks; obtaining image information of each foundation crack at a preset time point, and a reference circle corresponding to each foundation crack; drawing a circle with a preset radius in the foundation crack to obtain a preset number of circles, obtaining the overlapping degrees of each circle and the foundation crack, and arranging the overlapping degrees in descending order according to the sizes of the overlapping degrees, and marking the circle corresponding to the maximum overlapping degree as a reference circle; connecting the centers of the reference circles obtained at the initial position and the reference circles obtained at the preset time point after the time corresponding to the initial position with straight lines to obtain a displacement, presetting a displacement threshold, and if the displacement is greater than the displacement threshold, recording the displacement as a displacement loss; obtaining each displacement loss and the center of the corresponding circle; connecting the centers of the corresponding circles of each displacement loss with straight lines to form a complete and closed figure, and the figure is the largest closed figure that can be formed; calculating the area of the closed figure and recording it as a displacement actual value; comprehensively processing the water level difference approximation value and the displacement actual value to obtain a ground evaluation coefficient.

5. A method of monitoring the condition of a power line at a remote location according to claim 4, wherein comprehensively processing the insulator evaluation coefficient, the wire evaluation coefficient and the ground evaluation coefficient to obtain a risk evaluation coefficient, specifically including: after normalizing the insulator evaluation coefficient, the wire evaluation coefficient and the ground evaluation coefficient, taking the insulator evaluation coefficient and the wire evaluation coefficient as two legs of a right triangle, connecting the remaining leg to obtain a complete right triangle, taking the ground evaluation coefficient as the height of the three-prism, establishing a three-prism model, calculating the volume of the three-prism, and recording it as a risk evaluation coefficient.

6. A method of monitoring the condition of a power line at a remote location according to claim 5, wherein based on the risk evaluation coefficient, performing risk level evaluation on the power transmission line, including performing risk level evaluation on the risk evaluation coefficient of each region of the power transmission line; presetting the value range of three groups of thresholds, each value range of the thresholds corresponding to a risk level, matching the risk evaluation coefficient with the value range of the three groups of thresholds to obtain the risk level corresponding to the risk evaluation coefficient, wherein the risk level includes normal, abnormal and urgent.

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