A Transmission Line Risk Assessment Method

Abstract

The present invention discloses a transmission line risk assessment method. The present invention presets the time interval and duration period for monitoring the state of the transmission line, collects and analyzes the operating parameters of the transmission line within the duration period, obtains the operation risk assessment index of the transmission line at the current trigger monitoring signaling time point, and comprehensively assesses the operation risk of the transmission line within the duration period based on the operation risk assessment index. The operation risk assessment index is further compared with the corresponding reference threshold index. If the operation risk assessment index is greater than the corresponding reference threshold index, an operation alarm signal is triggered and a corresponding risk level is generated, thereby realizing a comprehensive assessment of the operation state of the transmission line and risk quantification.

Description

Technical Field

[0001] The present invention relates to the technical field of line risk assessment, and in particular to a transmission line risk assessment method. Background Art

[0002] With the acceleration of industrialization and urbanization, the safety and reliability of the power system, as the infrastructure of modern society, have received unprecedented attention. Transmission lines, as an important part of the power system, undertake the important task of long-distance power transmission. Therefore, it is necessary to assess and monitor the risks of transmission lines.

[0003] However, the existing transmission line risk assessment technology still has the following deficiencies:

[0004] Most of them rely on regular manual inspections or simple automated monitoring, which have certain limitations. Manual inspections are inefficient and it is difficult to conduct a comprehensive and detailed inspection of transmission lines. Traditional automated monitoring often only focuses on a single operating parameter of the line, such as current, voltage, etc., and lacks a comprehensive assessment of the temperature and image information of the transmission line, and cannot fully reflect and evaluate the actual operating status, usage status and potential risks of the transmission line.

[0005] Therefore, a transmission line risk assessment method is proposed. Summary of the invention

[0006] In view of this, the present invention provides a transmission line risk assessment method to solve the problems raised by the above background technology.

[0007] The object of the present invention can be achieved by the following technical solution: A transmission line risk assessment method, comprising:

[0008] S1: Preset the time interval and duration for monitoring the status of the transmission line. After reaching the preset monitoring time interval, trigger the monitoring signaling and collect the operating parameters of the transmission line during the duration period; the operating parameters include current, voltage and temperature;

[0009] S2: Analyze the operating parameters of the transmission line during the duration period to obtain the operation risk assessment index of the transmission line at the current triggering monitoring signaling time point ;

[0010] S3: Preset the time interval for collecting the transmission line image. After the preset collection time interval is reached, collect the image information of the transmission line, analyze the image information of the transmission line, and obtain the use risk assessment index of the transmission line. ;

[0011] S4: Preset operation risk assessment index separately and use of risk assessment indices The reference threshold index is used to extract the operation risk assessment index of the transmission line in steps S2 and S3. and use of risk assessment indices , and respectively compare them with the corresponding preset reference threshold indexes, trigger the corresponding alarm signaling based on the comparison results, and generate the corresponding risk level; the alarm signaling includes the operation alarm signaling and the use alarm signaling;

[0012] S5: Based on step S4, if the transmission line does not trigger any alarm signaling, further extract the operation risk assessment index of the x groups of transmission lines before the current trigger monitoring signaling time point; x>5; and perform analysis and evaluation to obtain the early warning assessment index of the transmission line at the current trigger monitoring signaling time point , preset early warning assessment index The reference threshold index, if the early warning evaluation index If the index is greater than the preset reference threshold, an early warning signal is triggered and sent to the manager's mobile terminal.

[0013] In some embodiments, the operating parameters of the transmission line during the duration period are analyzed, specifically:

[0014] Extracting the operating current value of the transmission line at each time point within the duration period, presetting the highest reference value of the operating current value of the transmission line, and comparing the operating current value of the transmission line at each time point within the duration period with the preset highest reference value respectively; if the operating current value of the transmission line at a certain time point is greater than the preset highest reference value, marking the operating current value of the transmission line at that time point as an excessive current value;

[0015] Count the number of excess current values ​​in the duration period as the excess individual value of the transmission line in the duration period ;

[0016] Further extract each group of excess current values, and calculate the difference with the preset maximum reference value, and take the average of the calculated differences of each group as the excess mean value of the transmission line in the duration period. ;

[0017] Finally, the average value of the operating current value of the transmission line at each time point in the duration period is taken, and the calculated average value is compared with the preset maximum reference value, and the calculated ratio is used as the total excess value of the transmission line in the duration period. ;

[0018] The excess value of the transmission line in the duration period , Excess Mean and excess total , substitute into the formula Perform weighted calculation to obtain the overload risk value of the transmission line within the duration period ;in , as well as Excessive values , Excess Mean and excess total The weight factor of influence.

[0019] In some embodiments, the operating parameters of the transmission line during the duration period are analyzed, further:

[0020] Extract the voltage value of the transmission line at each time point in the duration period, calculate the voltage value of the transmission line at each time point in the duration period using the standard deviation formula, and use the calculated result as the fluctuation amplitude value of the transmission line in the duration period ;

[0021] The temperature data of each monitoring point of the transmission line at each time point within the duration period is obtained, and the obtained temperature data is sorted according to the time point and the location of the monitoring point to form a temperature value matrix; based on the formed temperature value matrix, a heat map is created; and according to the heat map created for the transmission line within the duration period, the maximum temperature threshold of the heat map is preset, all data points exceeding the maximum temperature threshold are screened out, and the data points are classified based on the specific monitoring points corresponding to the data points to obtain the number of times each monitoring point of the transmission line exceeds the maximum temperature threshold within the duration period, and the number of times each monitoring point exceeds the maximum temperature threshold within the duration period is accumulated as the temperature overrun value of the transmission line within the duration period; further, for each monitoring point, the length of time continuously exceeding the maximum temperature threshold is obtained and recorded as the abnormal period, and the abnormal period of each monitoring point is accumulated as the temperature overrun duration of the transmission line within the duration period;

[0022] The temperature overshoot value and the temperature overshoot duration of the transmission line in the duration period are marked as and , and substitute into the formula Perform weighted calculation to obtain the temperature risk value of the transmission line during the duration period ;in and The temperature is respectively Warm and long time The weight factor of influence.

[0023] In some embodiments, the operation risk assessment index of the transmission line at the current trigger monitoring signaling time point is obtained. , specifically:

[0024] Preset overload risk values ​​separately , Fluctuation amplitude value and temperature risk value The reference threshold is used to extract the overload risk value of the transmission line in the duration period. , Fluctuation amplitude value and temperature risk value , respectively calculate the overload risk value , Fluctuation amplitude value and temperature risk value and the corresponding reference thresholds, and the calculated ratios are recorded as overload ratio, fluctuation ratio, and temperature ratio;

[0025] The calculated overload ratio, fluctuation ratio and temperature ratio are used as the length, width and height of the three-dimensional rectangle respectively, and a three-dimensional rectangular model is constructed. The constructed three-dimensional rectangular model is used as the operation risk model of the transmission line in the duration period, and the volume value of the operation risk model is extracted as the operation risk assessment index of the transmission line at the current trigger monitoring signaling time point. .

[0026] In some embodiments, the image information of the power transmission line is analyzed, specifically:

[0027] The transmission line is divided into a plurality of sub-areas, and based on each sub-area divided by the transmission line, image information of each sub-area corresponding to the transmission line is obtained, and the obtained image information of each sub-area is pre-processed; each divided sub-area is represented by a number i, i=1,2...k, and k is the total number of divided sub-areas;

[0028] The insulator part and the conductor part are segmented from the image information of each sub-area of ​​the transmission line, and features are extracted for each conductor part of the transmission line, and features related to wear and corrosion are extracted, and the extracted features are marked as the wear area and corrosion area of ​​each conductor part of the transmission line, and pixel statistics are performed on the marked wear area and corrosion area of ​​each conductor part, and the number of pixels in the wear area and corrosion area of ​​each conductor part is calculated, and the number of pixels in the wear area and corrosion area of ​​each conductor part is converted into the actual area based on the resolution of the image, so as to obtain the wear area and corrosion area of ​​each conductor part of the transmission line;

[0029] Feature extraction is performed on each insulator part of the transmission line, features related to cracks and damage are extracted, and the extracted features are marked as crack areas and damage areas of each insulator part of the transmission line. Pixel statistics are performed on the marked crack areas and damage areas of each insulator part, and the number of pixels of the crack areas and damage areas of each insulator part is calculated. Based on the resolution of the image, the number of pixels of the crack areas and damage areas of each insulator part is converted into actual areas to obtain the crack areas and damage areas of each insulator part of the transmission line.

[0030] In some embodiments, a transmission line use risk assessment index is obtained. , specifically:

[0031] Preset the area value ranges of each group of wear area, corrosion area, crack area and damaged area respectively, set each group of area value ranges of wear area, corrosion area, crack area and damaged area to correspond to an area risk value respectively, match the wear area, corrosion area, crack area and damaged area of ​​each sub-area of ​​the transmission line with the corresponding area value range respectively, and obtain the area risk value corresponding to the wear area, corrosion area, crack area and damaged area of ​​each sub-area of ​​the transmission line;

[0032] The area risk values ​​corresponding to the wear area and corrosion area in each sub-area are accumulated to obtain the conductor risk value of each sub-area and recorded as ;

[0033] The area risk values ​​corresponding to the crack area and damaged area in each sub-area are accumulated to obtain the insulation risk value of each sub-area, which is recorded as ;

[0034] The wire risk value of each sub-area and insulation risk value Substitute into the formula , perform weighted calculation to obtain the risk assessment index of transmission line use ;in and Represents the risk value of the conductor in each sub-area and insulation risk value The maximum allowed value of and are the conductor risk values ​​of each sub-area and insulation risk value The weight factor of influence.

[0035] In some embodiments, a corresponding alarm signal is triggered based on the comparison result, and a corresponding risk level is generated, specifically:

[0036] If the risk assessment index is run If the value is greater than the corresponding reference threshold index, the operation alarm signal is triggered and the operation risk assessment index is extracted. The difference between the index and the corresponding reference threshold index is calculated as the operation risk difference, and three groups of difference value ranges corresponding to the operation risk difference are set, and each group of difference value ranges corresponds to a risk level; the calculated operation risk difference is matched with the set three groups of difference value ranges to obtain the risk level of the current triggering operation alarm signal; the risk levels include general operation risk, medium operation risk and severe operation risk;

[0037] If using risk assessment index If it is greater than the corresponding reference threshold index, the usage alarm signal is triggered and the usage risk assessment index is extracted. And calculate the difference between the corresponding reference threshold index as the usage risk difference, set three groups of difference value ranges corresponding to the usage risk difference, and each group of difference value ranges corresponds to a risk level; match the calculated usage risk difference with the set three groups of difference value ranges to obtain the risk level that currently triggers the usage alarm signaling; the risk levels include general usage risk, medium usage risk and severe usage risk.

[0038] In some embodiments, the early warning evaluation index of the power transmission line at the current trigger monitoring signaling time point is obtained. , specifically:

[0039] Obtain each group of operation risk assessment indexes corresponding to the transmission line, thereby constructing a line graph of the operation risk changes of the transmission line, and based on the time order of each group of operation risk assessment indexes, draw the numerical points corresponding to each group of operation risk assessment indexes in the line graph, connect adjacent numerical points to obtain risk lines, and calculate the slope of each risk line and the angle with the horizontal line. If the angle between a certain risk line and the horizontal line is an obtuse angle, then mark the slope of the risk line as an upward slope, and if the angle between a certain risk line and the horizontal line is an acute angle, then mark the slope of the risk line as a downward slope;

[0040] All rising slopes and falling slopes are accumulated respectively to obtain the total rising value and the total falling value of the transmission line, and the ratio between the total rising value and the total falling value is calculated to obtain the trend ratio;

[0041] In the constructed operational risk change line chart, the highest value point and the lowest value point are marked respectively, and a vertical line segment is constructed between the two groups of marked points. The length of the vertical line segment is calculated to obtain the gap amount;

[0042] The obtained trend ratio and gap amount are marked as and , and substitute into the formula Perform weighted calculation to obtain the early warning evaluation index of the transmission line at the current trigger monitoring signaling time point ;in and Trend ratio and the gap The weight factor of influence.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The present invention presets the time interval and duration period for monitoring the state of the transmission line, collects and analyzes the operating parameters of the transmission line within the duration period, obtains the operation risk assessment index of the transmission line at the current triggering monitoring signaling time point, comprehensively assesses the operation risk of the transmission line within the duration period based on the operation risk assessment index, further compares the operation risk assessment index with the corresponding reference threshold index, and if the operation risk assessment index is greater than the corresponding reference threshold index, triggers the operation alarm signaling and generates the corresponding risk level, thereby achieving a comprehensive assessment of the operation state of the transmission line and risk quantification;

[0045] The present invention presets a time interval for collecting images of the transmission line. After the preset collection time interval is reached, the image information of the transmission line is collected, and the image information of the transmission line is analyzed to obtain a use risk assessment index of the transmission line. Based on the use risk assessment index, the use status of the transmission line is comprehensively assessed, which solves the problem that the prior art often only focuses on a single operating parameter of the line and lacks comprehensive assessment of the image information of the transmission line, and comprehensively reflects the use status of the transmission line. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Further details, features and advantages of the present application are disclosed in the following description of exemplary embodiments in conjunction with the accompanying drawings, in which:

[0047] Figure 1 A flowchart of the present invention;

[0048] Figure 2 It is a schematic diagram of the line graph of operation risk changes in the present invention. DETAILED DESCRIPTION

[0049] Several embodiments of the present application will be described in more detail below with reference to the accompanying drawings so that those skilled in the art can implement the present application. The present 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 present application comprehensive and complete, and to fully convey the scope of the present application to those skilled in the art. The embodiments do not limit the present application.

[0050] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those 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 consistent with their meaning in the relevant art and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0051] See also Figure 1 As shown, a transmission line risk assessment method includes:

[0052] S1: preset the time interval and duration for monitoring the status of the transmission line; for example, data collection is performed every 10 minutes or every hour, and parameter changes of the transmission line within 2 minutes or 5 minutes are collected; after reaching the preset monitoring time interval, the monitoring signal is triggered, and the operating parameters of the transmission line within the duration period are collected; the operating parameters include current, voltage and temperature;

[0053] S2: Analyze the operating parameters of the transmission line during the duration period to obtain the operation risk assessment index of the transmission line at the current triggering monitoring signaling time point ;

[0054] Specifically:

[0055] Extracting the operating current value of the transmission line at each time point within the duration period, presetting the highest reference value of the operating current value of the transmission line, and comparing the operating current value of the transmission line at each time point within the duration period with the preset highest reference value respectively; if the operating current value of the transmission line at a certain time point is greater than the preset highest reference value, marking the operating current value of the transmission line at that time point as an excessive current value;

[0056] Count the number of excess current values ​​in the duration period as the excess individual value of the transmission line in the duration period ;

[0057] Further extract each group of excess current values, and calculate the difference with the preset maximum reference value, and take the average of the calculated differences of each group as the excess mean value of the transmission line in the duration period. ;

[0058] Finally, the average value of the operating current value of the transmission line at each time point in the duration period is taken, and the calculated average value is compared with the preset maximum reference value, and the calculated ratio is used as the total excess value of the transmission line in the duration period. ;

[0059] The excess value of the transmission line in the duration period , Excess Mean and excess total , substitute into the formula Perform weighted calculation to obtain the overload risk value of the transmission line within the duration period ;in , as well as Excessive values , Excess Mean and excess total The impact weight factor of

[0060] Extract the voltage value of the transmission line at each time point in the duration period, calculate the voltage value of the transmission line at each time point in the duration period using the standard deviation formula, and use the calculated result as the fluctuation amplitude value of the transmission line in the duration period ;

[0061] Based on multiple monitoring points pre-deployed on the transmission line; the specific number of deployments is set by the technical staff; the temperature data of each monitoring point on the transmission line at each time point within the duration period is obtained, and the obtained temperature data is sorted according to the time point and the location of the monitoring point to form a temperature value matrix; for example, if there are three monitoring points and the data of 10 time points are recorded, the matrix will have 10 rows (time points) and 3 columns (monitoring points); based on the formed temperature value matrix, a heat map is created; the color mapping, temperature range, label and legend of the heat map are determined; and according to the temperature value matrix created by the transmission line within the duration period, the temperature value matrix is ​​formed. A heat map of the power transmission line is obtained, the highest temperature threshold of the heat map is preset, all data points exceeding the highest temperature threshold are screened out, and the data points are classified based on the specific monitoring points corresponding to the data points, so as to obtain the number of times each monitoring point of the power transmission line exceeds the highest temperature threshold within the duration period, and the number of times each monitoring point exceeds the highest temperature threshold within the duration period is accumulated as the temperature overrun value of the power transmission line within the duration period; further, for each monitoring point, the length of time continuously exceeding the highest temperature threshold is obtained and recorded as the abnormal period, and the abnormal period of each monitoring point is accumulated as the temperature overrun duration of the power transmission line within the duration period;

[0062] The temperature overshoot value and the temperature overshoot duration of the transmission line in the duration period are marked as and , and substitute into the formula Perform weighted calculation to obtain the temperature risk value of the transmission line during the duration period ;in and The temperature is respectively Warm and long time The impact weight factor of

[0063] Get the operation risk assessment index of the transmission line at the current trigger monitoring signaling time point , specifically:

[0064] Preset overload risk values ​​separately , Fluctuation amplitude value As well as the reference threshold of the temperature risk value, the overload risk value of the transmission line in the duration period is extracted , Fluctuation amplitude value and temperature risk value , respectively calculate the overload risk value , Fluctuation amplitude value and temperature risk value and the corresponding reference thresholds, and the calculated ratios are recorded as overload ratio, fluctuation ratio, and temperature ratio;

[0065] The calculated overload ratio, fluctuation ratio and temperature ratio are used as the length, width and height of the three-dimensional rectangle respectively, and a three-dimensional rectangular model is constructed. The constructed three-dimensional rectangular model is used as the operation risk model of the transmission line in the duration period, and the volume value of the operation risk model is extracted as the operation risk assessment index of the transmission line at the current trigger monitoring signaling time point. ;

[0066] S3: Preset the time interval for collecting the transmission line image. After the preset collection time interval is reached, collect the image information of the transmission line, analyze the image information of the transmission line, and obtain the use risk assessment index of the transmission line. ;

[0067] Specifically:

[0068] Based on the total length of the transmission line, it is divided into multiple image acquisition sub-areas, and image information of each divided sub-area is collected respectively. The image information of each divided sub-area can be collected by using a drone, and the collected image information of each divided sub-area is integrated into an image data packet;

[0069] The transmission line is divided into a plurality of sub-regions, and based on the sub-regions divided by the transmission line, image information corresponding to each sub-region of the transmission line is obtained, and the obtained image information of each sub-region is preprocessed; the preprocessing includes adjusting brightness and contrast, denoising, cropping, etc. to improve image quality; each divided sub-region is represented by a number i, i=1,2...k, and k is the total number of divided sub-regions;

[0070] Firstly, the insulator part and the conductor part are segmented from the image information of each sub-area of ​​the transmission line by using image processing technology, and the features of each conductor part of the transmission line are extracted, and the features related to wear and corrosion are extracted, and the extracted features are marked as the wear area and corrosion area of ​​each conductor part of the transmission line, and the pixel count of the marked wear area and corrosion area of ​​each conductor part is performed, and the number of pixels in the wear area and corrosion area of ​​each conductor part is calculated, and the number of pixels in the wear area and corrosion area of ​​each conductor part is converted into the actual area based on the resolution of the image, so as to obtain the wear area and corrosion area of ​​each conductor part of the transmission line;

[0071] Perform feature extraction on each insulator part of the transmission line, extract features related to cracks and damage, and mark the extracted features as crack areas and damage areas of each insulator part of the transmission line, perform pixel statistics on the marked crack areas and damage areas of each insulator part, calculate the number of pixels of the crack areas and damage areas of each insulator part, convert the number of pixels of the crack areas and damage areas of each insulator part into actual areas based on the resolution of the image, and obtain the crack areas and damage areas of each insulator part of the transmission line;

[0072] Preset the area value ranges of each group of wear area, corrosion area, crack area and damaged area respectively, set each group of area value ranges of wear area, corrosion area, crack area and damaged area to correspond to an area risk value respectively, match the wear area, corrosion area, crack area and damaged area of ​​each sub-area of ​​the transmission line with the corresponding area value range respectively, and obtain the area risk value corresponding to the wear area, corrosion area, crack area and damaged area of ​​each sub-area of ​​the transmission line;

[0073] The area risk values ​​corresponding to the wear area and corrosion area in each sub-area are accumulated to obtain the conductor risk value of each sub-area and recorded as ;

[0074] The area risk values ​​corresponding to the crack area and damaged area in each sub-area are accumulated to obtain the insulation risk value of each sub-area, which is recorded as ;

[0075] The wire risk value of each sub-area and insulation risk value Substitute into the formula , perform weighted calculation to obtain the risk assessment index of transmission line use ;in and Represents the risk value of the conductor in each sub-area and insulation risk value The maximum allowed value of and are the conductor risk values ​​of each sub-area and insulation risk value The impact weight factor of

[0076] S4: Preset operation risk assessment index separately and use of risk assessment indices The reference threshold index is used to extract the operation risk assessment index of the transmission line in steps S2 and S3. and use of risk assessment indices , and respectively compare them with the corresponding preset reference threshold indexes, trigger the corresponding alarm signaling based on the comparison results, and generate the corresponding risk level; the alarm signaling includes the operation alarm signaling and the use alarm signaling;

[0077] Specifically:

[0078] If the risk assessment index is run If the value is greater than the corresponding reference threshold index, the operation alarm signal is triggered and the operation risk assessment index is extracted. The difference between the index and the corresponding reference threshold index is calculated as the operational risk difference, and three groups of difference value ranges corresponding to the operational risk difference are set, each group of difference value ranges corresponding to a risk level;

[0079] The calculated operation risk difference is matched with the three sets of difference value ranges set to obtain the risk level that currently triggers the operation alarm signaling; the risk level includes general operation risk, medium operation risk and severe operation risk;

[0080] Similarly, if we use the risk assessment index If it is greater than the corresponding reference threshold index, the usage alarm signal is triggered and the usage risk assessment index is extracted. The difference between the index and the corresponding reference threshold index is calculated as the use risk difference, and three groups of difference value ranges corresponding to the use risk difference are set, and each group of difference value ranges corresponds to a risk level;

[0081] The calculated usage risk difference is matched with the three sets of difference value ranges set to obtain the risk level of the current triggering usage alarm signaling; the risk level includes general usage risk, medium usage risk and severe usage risk;

[0082] S5: Based on step S4, if the transmission line does not trigger any alarm signaling, further extract the operation risk assessment index of x groups of transmission lines before the current trigger monitoring signaling time point; x>5, and the specific number is set by the technical staff and can be adjusted later; and analyze and evaluate to obtain the early warning assessment index of the transmission line at the current trigger monitoring signaling time point , preset early warning assessment index The reference threshold index, if the early warning evaluation index If the index is greater than the preset reference threshold, an early warning signal is triggered and sent to the manager's mobile terminal;

[0083] Specifically:

[0084] Obtain each group of operation risk assessment indexes corresponding to the transmission line, thereby constructing a line graph of the operation risk changes of the transmission line, and based on the time order of each group of operation risk assessment indexes, draw the numerical points corresponding to each group of operation risk assessment indexes in the line graph, connect adjacent numerical points to obtain risk lines, and calculate the slope of each risk line and the angle with the horizontal line. If the angle between a certain risk line and the horizontal line is an obtuse angle, then mark the slope of the risk line as an upward slope, and if the angle between a certain risk line and the horizontal line is an acute angle, then mark the slope of the risk line as a downward slope;

[0085] All rising slopes and falling slopes are accumulated respectively to obtain the total rising value and the total falling value of the transmission line, and the ratio between the total rising value and the total falling value is calculated to obtain the trend ratio;

[0086] In the constructed operational risk change line chart, the highest value point and the lowest value point are marked respectively, and a vertical line segment is constructed between the two groups of marked points. The length of the vertical line segment is calculated to obtain the gap amount;

[0087] The obtained trend ratio and gap amount are marked as and , and substitute into the formula Perform weighted calculation to obtain the early warning evaluation index of the transmission line at the current trigger monitoring signaling time point ;in and Trend ratio and the gap The impact weight factor of

[0088] The above formulas are obtained by collecting a large amount of data and performing software simulation, and a formula close to the actual value is selected. The influencing weight factor and specific coefficient value in the formula are set by technical personnel in this field according to actual conditions, and can be adjusted and modified later.

[0089] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A transmission line risk assessment method, characterized in that: include: S1: Preset the time interval and duration for monitoring the status of the transmission line. After reaching the preset monitoring time interval, trigger the monitoring signaling and collect the operating parameters of the transmission line during the duration period; the operating parameters include current, voltage and temperature; S2: Analyze the operating parameters of the transmission line during the duration period to obtain the operating risk assessment index of the transmission line at the current triggering monitoring signaling time point ; The operating parameters of the transmission line during the duration period are analyzed, specifically: Extracting the operating current value of the transmission line at each time point within the duration period, presetting the highest reference value of the operating current value of the transmission line, and comparing the operating current value of the transmission line at each time point within the duration period with the preset highest reference value respectively; if the operating current value of the transmission line at a certain time point is greater than the preset highest reference value, marking the operating current value of the transmission line at that time point as an excessive current value; Count the number of excess current values ​​in the duration period as the excess individual value of the transmission line in the duration period ; Further extract each group of excess current values, and calculate the difference with the preset maximum reference value, and take the average of the calculated differences of each group as the excess mean value of the transmission line in the duration period. ; Finally, the average value of the operating current value of the transmission line at each time point in the duration period is taken, and the calculated average value is compared with the preset maximum reference value, and the calculated ratio is used as the total excess value of the transmission line in the duration period. ; The excess value of the transmission line in the duration period , Excess Mean and excess total , substitute into the formula Perform weighted calculation to obtain the overload risk value of the transmission line within the duration period ;in , as well as Excessive values , Excess Mean and excess total The impact weight factor of Extract the voltage value of the transmission line at each time point in the duration period, calculate the voltage value of the transmission line at each time point in the duration period using the standard deviation formula, and use the calculated result as the fluctuation amplitude value of the transmission line in the duration period ; The temperature data of each monitoring point of the transmission line at each time point within the duration period is obtained, and the obtained temperature data is sorted according to the time point and the location of the monitoring point to form a temperature value matrix; based on the formed temperature value matrix, a heat map is created; and according to the heat map created for the transmission line within the duration period, the maximum temperature threshold of the heat map is preset, all data points exceeding the maximum temperature threshold are screened out, and the data points are classified based on the specific monitoring points corresponding to the data points to obtain the number of times each monitoring point of the transmission line exceeds the maximum temperature threshold within the duration period, and the number of times each monitoring point exceeds the maximum temperature threshold within the duration period is accumulated as the temperature overrun value of the transmission line within the duration period; further, for each monitoring point, the length of time continuously exceeding the maximum temperature threshold is obtained and recorded as the abnormal period, and the abnormal period of each monitoring point is accumulated as the temperature overrun duration of the transmission line within the duration period; The temperature overshoot value and the temperature overshoot duration of the transmission line in the duration period are marked as and , and substitute into the formula Perform weighted calculation to obtain the temperature risk value of the transmission line during the duration period ;in and The temperature is respectively Warm and long time The impact weight factor of Get the operation risk assessment index of the transmission line at the current trigger monitoring signaling time point , specifically: Preset overload risk values ​​separately , Fluctuation amplitude value and temperature risk value The reference threshold is used to extract the overload risk value of the transmission line in the duration period. , Fluctuation amplitude value and temperature risk value , respectively calculate the overload risk value , Fluctuation amplitude value and temperature risk value and the corresponding reference thresholds, and the calculated ratios are recorded as overload ratio, fluctuation ratio, and temperature ratio; The calculated overload ratio, fluctuation ratio and temperature ratio are used as the length, width and height of the three-dimensional rectangle respectively, and a three-dimensional rectangular model is constructed. The constructed three-dimensional rectangular model is used as the operation risk model of the transmission line in the duration period, and the volume value of the operation risk model is extracted as the operation risk assessment index of the transmission line at the current trigger monitoring signaling time point. ; S3: Preset the time interval for collecting the transmission line image. After the preset collection time interval is reached, collect the image information of the transmission line, analyze the image information of the transmission line, and obtain the use risk assessment index of the transmission line. ; The image information of the transmission line is analyzed, specifically: The transmission line is divided into a plurality of sub-areas, and based on each sub-area divided by the transmission line, image information of each sub-area corresponding to the transmission line is obtained, and the obtained image information of each sub-area is pre-processed; each divided sub-area is represented by a number i, i=1,2...k, and k is the total number of divided sub-areas; The insulator part and the conductor part are segmented from the image information of each sub-area of ​​the transmission line, and features are extracted for each conductor part of the transmission line, and features related to wear and corrosion are extracted, and the extracted features are marked as the wear area and corrosion area of ​​each conductor part of the transmission line, and pixel statistics are performed on the marked wear area and corrosion area of ​​each conductor part, and the number of pixels in the wear area and corrosion area of ​​each conductor part is calculated, and the number of pixels in the wear area and corrosion area of ​​each conductor part is converted into the actual area based on the resolution of the image, so as to obtain the wear area and corrosion area of ​​each conductor part of the transmission line; Perform feature extraction on each insulator part of the transmission line, extract features related to cracks and damage, and mark the extracted features as crack areas and damage areas of each insulator part of the transmission line, perform pixel statistics on the marked crack areas and damage areas of each insulator part, calculate the number of pixels of the crack areas and damage areas of each insulator part, convert the number of pixels of the crack areas and damage areas of each insulator part into actual areas based on the resolution of the image, and obtain the crack areas and damage areas of each insulator part of the transmission line; Get the risk assessment index of transmission line use , specifically: Preset the area value ranges of each group of wear area, corrosion area, crack area and damaged area respectively, set each group of area value ranges of wear area, corrosion area, crack area and damaged area to correspond to an area risk value respectively, match the wear area, corrosion area, crack area and damaged area of ​​each sub-area of ​​the transmission line with the corresponding area value range respectively, and obtain the area risk value corresponding to the wear area, corrosion area, crack area and damaged area of ​​each sub-area of ​​the transmission line; The area risk values ​​corresponding to the wear area and corrosion area in each sub-area are accumulated to obtain the conductor risk value of each sub-area and recorded as ; The area risk values ​​corresponding to the crack area and damaged area in each sub-area are accumulated to obtain the insulation risk value of each sub-area, which is recorded as ; The wire risk value of each sub-area and insulation risk value Substitute into the formula , perform weighted calculation to obtain the risk assessment index of transmission line use ;in and Represents the risk value of the conductor in each sub-area and insulation risk value The maximum allowed value of and are the conductor risk values ​​of each sub-area and insulation risk value The impact weight factor of S4: Preset operation risk assessment index separately and use of risk assessment indices The reference threshold index is used to extract the operation risk assessment index of the transmission line in steps S2 and S3. and use of risk assessment indices , and respectively compare them with the corresponding preset reference threshold indexes, trigger the corresponding alarm signaling based on the comparison results, and generate the corresponding risk level; the alarm signaling includes the operation alarm signaling and the use alarm signaling; S5: Based on step S4, if the transmission line does not trigger any alarm signaling, further extract the operation risk assessment index of x groups of transmission lines before the current triggering monitoring signaling time point; x>5; And analyze and evaluate to obtain the early warning evaluation index of the transmission line at the current trigger monitoring signaling time point , preset early warning assessment index The reference threshold index, if the early warning evaluation index If the index is greater than the preset reference threshold, an early warning signal is triggered and sent to the manager's mobile terminal; Get the early warning evaluation index of the transmission line at the current trigger monitoring signaling time point , specifically: Obtain each group of operation risk assessment indexes corresponding to the transmission line, thereby constructing a line graph of the operation risk changes of the transmission line, and based on the time order of each group of operation risk assessment indexes, draw the numerical points corresponding to each group of operation risk assessment indexes in the line graph, connect adjacent numerical points to obtain risk lines, and calculate the slope of each risk line and the angle with the horizontal line. If the angle between a certain risk line and the horizontal line is an obtuse angle, then mark the slope of the risk line as an upward slope, and if the angle between a certain risk line and the horizontal line is an acute angle, then mark the slope of the risk line as a downward slope; All rising slopes and falling slopes are accumulated respectively to obtain the total rising value and the total falling value of the transmission line, and the ratio between the total rising value and the total falling value is calculated to obtain the trend ratio; In the constructed operational risk change line chart, the highest value point and the lowest value point are marked respectively, and a vertical line segment is constructed between the two groups of marked points. The length of the vertical line segment is calculated to obtain the gap amount; The obtained trend ratio and gap amount are marked as and , and substitute into the formula Perform weighted calculation to obtain the early warning evaluation index of the transmission line at the current trigger monitoring signaling time point ;in and Trend ratio and the gap The weight factor of influence.

2. A transmission line risk assessment method according to claim 1, characterized in that: Based on the comparison results, the corresponding alarm signal is triggered and the corresponding risk level is generated, specifically: If the risk assessment index is run If the value is greater than the corresponding reference threshold index, the operation alarm signal is triggered and the operation risk assessment index is extracted. The difference between the index and the corresponding reference threshold index is calculated as the operational risk difference, and three groups of difference value ranges corresponding to the operational risk difference are set, each group of difference value ranges corresponding to a risk level; The calculated operation risk difference is matched with the three sets of difference value ranges set to obtain the risk level that currently triggers the operation alarm signaling; Risk levels include general operational risk, moderate operational risk, and severe operational risk; If using risk assessment index If it is greater than the corresponding reference threshold index, the usage alarm signal is triggered and the usage risk assessment index is extracted. The difference between the index and the corresponding reference threshold index is calculated as the use risk difference, and three groups of difference value ranges corresponding to the use risk difference are set, and each group of difference value ranges corresponds to a risk level; The calculated usage risk difference is matched with the three sets of difference value ranges set to obtain the risk level that currently triggers the usage alarm signaling; The risk levels include general use risk, medium use risk, and severe use risk.

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