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CN-122017453-A - Power transmission line wind-proof reinforcement construction operation state evaluation method

CN122017453ACN 122017453 ACN122017453 ACN 122017453ACN-122017453-A

Abstract

The application provides a power transmission line wind-proof reinforcement construction operation state evaluation method, which relates to the technical field of power state evaluation and comprises the steps of analyzing an outlet distance value, marking a region lower than a safety lower limit as a stress superposition risk region, and marking a region in a safety range as a normal regulation region; the method comprises the steps of identifying deflection angle abnormal sections according to angle abrupt change clusters and gradient abrupt increase clusters, fusing contact pressure of clamping sections to determine position boundary values, supplementing and perfecting a fatigue damage potential identification group, grading damage quantification values according to zero damage marks and a preset damage degree grading threshold value to obtain a damage degree grading result of the line tightening operation, judging risk grades according to the damage degree grading result of the line tightening operation, identifying triggering positions of high risk sections, updating an initial clamping position data set, and outputting a final damage evaluation report. The precision and the efficiency of wire fatigue damage monitoring are effectively improved, and reliable technical support is provided for the safe operation of the power line.

Inventors

  • He Xuena
  • PENG SHAOLONG
  • CHEN XUZHI
  • LI JIAWEN

Assignees

  • 惠州市恒辉电气工程有限公司

Dates

Publication Date
20260512
Application Date
20260130

Claims (10)

  1. 1. The utility model provides a power transmission line wind-proof reinforcement construction operation state evaluation method which is characterized by comprising the following steps: a clamping force acquisition module and a strain probe are deployed in the sag adjustment monitoring device, a distance value of a clamping point from an outlet of a strain clamp, a contact pressure of a clamping section, a wire deflection angle and a strain gradient value of the surface of an aluminum strand are obtained, and an initial clamping position data set is established; analyzing the distance value of the clamping point from the outlet of the strain clamp, marking a region lower than a preset safety lower limit as a stress superposition risk region, and marking a region in a preset safety range as a normal regulation region; Extracting deflection angles and strain gradient values from the stress superposition risk area, carrying out grouping treatment through a k-means clustering algorithm to obtain an angle mutation cluster and a gradient steep increase cluster, and respectively screening acquisition points exceeding a preset threshold value from the angle mutation cluster and the gradient steep increase cluster to construct a fatigue damage potential identification group; identifying a deflection angle abnormal section according to the angle abrupt change cluster and the gradient abrupt increase cluster, fusing the contact pressure of the clamping section to determine a position boundary value, and supplementing the fatigue damage potential identification group; Analyzing the change trend of the strain gradient values of the fatigue damage potential identification group, dividing the section types according to a preset gradient amplification threshold value, generating a damage quantification value for the gradient abrupt increase section, and generating a zero damage mark for the gradient steady section; Classifying the damage quantification value according to the zero damage mark and a preset damage degree classification threshold value to obtain a damage degree classification result of the line tightening operation; And judging the risk level according to the damage degree grading result of the line tightening operation, identifying the triggering position of the high-risk section, updating the initial clamping position data set, and outputting a final damage evaluation report.
  2. 2. The method for evaluating the wind-proof reinforcement construction operation state of the power transmission line according to claim 1, wherein the step of deploying the clamping force acquisition module and the strain probe in the sag adjustment monitoring device to obtain the distance value of the clamping point from the outlet of the strain clamp, the contact pressure of the clamping section, the deflection angle of the wire and the surface strain gradient value of the aluminum strand, and the step of establishing an initial clamping position data set comprises the following steps: A pressure sensor, a displacement encoder and a strain probe array are arranged on a clamping mechanism of the sag adjustment monitoring device, wherein the pressure sensor is arranged at each contact point position of a clamping section, the displacement encoder is arranged between a wire clamping clamp and a strain clamp, the strain probe array is stuck along the surface of an aluminum strand of the clamping section, a distance value between the wire clamping clamp and an outlet of the strain clamp and a pressure distribution value of each contact point in the clamping section are obtained, and a clamping distance record table and a contact pressure distribution map are generated; Arranging an angle sensor at a wire bending part of the clamping section, collecting deflection angle values of the wire relative to the outlet direction of the strain clamp, and generating angle deflection associated records of all clamping points according to the deflection angle values and corresponding position information in the clamping distance record table; And acquiring the surface strain values of the aluminum strands at the positions of each probe through the strain probe array, calculating the difference value of the strain values between the adjacent probes as a strain gradient value, matching and aligning the strain gradient value, the angle deflection correlation record and the contact pressure distribution map according to an acquisition time stamp, and establishing an initial clamping position data set.
  3. 3. The method for evaluating the wind-proof reinforcement construction operation state of a power transmission line according to claim 1, wherein analyzing the distance value of the clamping point from the outlet of the strain clamp, marking a region below a preset safety lower limit as a stress superposition risk region, marking a region within the preset safety range as a normal regulation region, comprises: Extracting outlet distance values corresponding to all clamping points from the initial clamping position data set, comparing the outlet distance values with a preset safety lower limit threshold, and marking the area where the clamping points are located as a stress superposition risk area if the outlet distance values are lower than the safety lower limit threshold; and aiming at the clamping point with the outlet distance value not lower than the safety lower limit threshold, judging that the clamping point is in a safety range, marking the area where the clamping point is positioned as a normal adjusting area, and combining the stress superposition risk area to obtain an area division result.
  4. 4. The method for evaluating the wind-proof reinforcement construction operation state of the power transmission line according to claim 1, wherein the method is characterized in that deflection angle and strain gradient values are extracted from the stress superposition risk area, grouping processing is carried out through a k-means clustering algorithm to obtain an angle abrupt change cluster and a gradient abrupt increase cluster, acquisition points exceeding a preset threshold are respectively screened from the angle abrupt change cluster and the gradient abrupt increase cluster, and a fatigue damage potential identification group is constructed, and the method comprises the following steps: extracting deflection angle values and strain gradient values corresponding to all the acquisition points from the stress superposition risk area, combining the deflection angle values and the strain gradient values of each acquisition point into two-dimensional feature vectors, and converging the feature vectors of all the acquisition points to form a data set to be clustered; Grouping the data sets to be clustered by adopting a k-means clustering algorithm, calculating Euclidean distance between each feature vector and a cluster center, and dividing each feature vector into corresponding clusters according to a distance minimum principle to obtain an angle mutation cluster and a gradient steep increase cluster; Extracting acquisition points with deflection angle values exceeding a preset angle threshold value from the angle abrupt change cluster, extracting acquisition points with strain gradient values exceeding a preset gradient threshold value from the gradient abrupt increase cluster, combining the two types of acquisition points, and constructing a fatigue damage potential identification group; And extracting deflection angle time sequence records of all the acquisition points and gradient distribution data of the aluminum strand surface strain from the stress superposition risk area, extracting angle change difference values and gradient increment amplitudes between adjacent acquisition points, analyzing the acquisition point positions of which the angle change difference values exceed a preset deflection threshold value to form angle mutation clusters, identifying acquisition point intervals of which the gradient increment amplitudes continuously rise to form gradient abrupt increase clusters, and determining a space overlapping section of the angle mutation clusters and the gradient abrupt increase clusters as a core group of a fatigue damage potential identification group.
  5. 5. The method for evaluating the wind-proof reinforcement construction operation state of a power transmission line according to claim 1, wherein the method for recognizing the deflection angle abnormal section according to the angle abrupt change cluster and the gradient abrupt increase cluster, fusing the contact pressure of the clamping section to determine a position boundary value, and supplementing the fatigue damage potential recognition group comprises the following steps: Extracting the axial position coordinate range of each acquisition point from the angle abrupt change cluster, extracting the axial position coordinate range of each acquisition point from the gradient abrupt increase cluster, and carrying out union operation on the axial position coordinate ranges of the two clusters to obtain the initial boundary of the deflection angle abnormal section; Acquiring a contact pressure value of each position in the clamping section, identifying a position interval in which the contact pressure exceeds a preset pressure threshold, taking a start coordinate and a stop coordinate of the position interval as pressure boundary values, correcting an initial boundary of the deflection angle abnormal section according to the pressure boundary values, and determining a position boundary value of the deflection angle abnormal section; and merging the acquisition points in the deflection angle abnormal section defined by the position boundary value with the core group of the fatigue damage potential identification group, removing repeated acquisition point records, and supplementing and perfecting the fatigue damage potential identification group.
  6. 6. The method for evaluating the wind-proof reinforcement construction operation state of a power transmission line according to claim 1, wherein analyzing the change trend of the strain gradient value of the fatigue damage potential identification group, dividing the section types according to a preset gradient amplification threshold, generating a damage quantification value for a gradient abrupt-increase section, and generating a zero damage mark for a gradient steady section comprises: Extracting strain gradient values of all the acquisition points from the fatigue damage potential identification group, arranging the strain gradient values according to the axial position coordinate sequence of the acquisition points, calculating the difference value of the strain gradient values between the adjacent acquisition points, marking the difference value as an ascending trend if the difference value is a regular mark, marking the difference value as a stable trend if the difference value is negative or zero, and obtaining trend identifiers corresponding to all the acquisition points; Dividing the acquisition points in the fatigue damage potential identification group into sections according to the trend identifications, dividing the sections of which the trend identifications of the continuous multiple acquisition points are all rising trends and the corresponding difference value exceeds a preset gradient amplification threshold value into gradient steep sections, and dividing the sections of the acquisition points of which the trend identifications are stable trends into gradient stable sections; And generating damage quantification values according to the accumulated amplification of the strain gradient values of all the acquisition points in the gradient steep increase section, and generating zero damage marks for all the acquisition points in the gradient stable section.
  7. 7. The method for evaluating the wind-proof reinforcement construction operation state of a power transmission line according to claim 6, wherein the generating a zero damage flag for each acquisition point in the gradient plateau section comprises: The strain gradient value history acquisition records of all the sections are extracted from the fatigue damage potential identification group, the strain gradient values of all the time points are arranged according to the acquisition time stamp sequence, the difference value of the strain gradient values between the adjacent time points is calculated as a gradient increment, the gradient change direction of all the time points is determined according to the positive and negative signs of the gradient increment, and the gradient increment sequence and the gradient change direction sequence of all the sections are obtained; detecting whether the gradient change direction is continuously positive section by section according to the gradient change direction sequence, accumulating the gradient increment of each time point to obtain the accumulated amplification of the section, and judging whether the accumulated amplification exceeds a preset damage starting threshold; If the accumulated amplification exceeds a preset damage starting threshold value and the gradient change direction is continuously positive, generating a damage quantification value corresponding to the section according to the value of the accumulated amplification, and if the gradient increment is alternately changed between positive and negative and the accumulated amplification is lower than the preset damage starting threshold value, marking the section as a zero damage state; Summarizing the damage quantized values and the zero damage state marks of each section, arranging according to the axial position coordinate sequence of the sections, and establishing a comparison list of the damage quantized values and the zero damage marks of each section.
  8. 8. The method for evaluating the wind-proof reinforcement construction operation state of the power transmission line according to claim 1, wherein the classifying the damage quantification value according to the zero damage mark and a preset damage degree classifying threshold value to obtain a result of classifying the damage degree of the line tightening operation comprises the following steps: Screening out a section marked as a zero damage mark, directly setting the damage degree grade of the section to be a nondestructive grade, and extracting the damage quantized value of the section marked with the damage quantized value as input data of grading treatment; Grading the damage quantized values according to a preset damage degree grading threshold, grading the sections with the damage quantized values lower than a first grading threshold into mild damage grades, grading the sections with the damage quantized values between the first grading threshold and a second grading threshold into moderate damage grades, grading the sections with the damage quantized values exceeding the second grading threshold into severe damage grades, and obtaining damage degree grade labels corresponding to the sections; And arranging and integrating the nondestructive grade and each damage degree grade label according to the axial position coordinate sequence of the section to obtain the damage degree grading result of the line tightening operation.
  9. 9. The method for evaluating the wind-proof reinforcement construction operation state of a power transmission line according to claim 1, wherein judging a risk level according to the grading result of the degree of damage of the tightening operation, identifying a triggering position of a high risk section, updating the initial clamping position data set, and outputting a final damage evaluation report, comprises: judging a section with a damage degree grade being a heavy damage grade as a high risk grade section according to the damage degree grading result of the line tightening operation, and extracting an axial position coordinate of the high risk grade section as a triggering position of the high risk section; and writing the triggering position of the high-risk section and the corresponding damage quantification value into the initial clamping position data set for updating.
  10. 10. The method for evaluating the wind-proof reinforcement construction operation state of a power transmission line according to claim 9, wherein the outputting of the final damage evaluation report comprises: And summarizing the grading result of the damage degree of the line tightening operation, the triggering position of the high-risk section and the updated initial clamping position data set, integrating according to the axial position coordinates of the sections, forming a final damage evaluation report and outputting the final damage evaluation report.

Description

Power transmission line wind-proof reinforcement construction operation state evaluation method Technical Field The invention relates to the technical field of power state evaluation, in particular to a power transmission line wind-proof reinforcement construction operation state evaluation method. Background The transmission line is easy to dance and vibrate in a strong wind environment, so that the wire is tired and broken, even the line falls into a tower, and wind prevention and reinforcement become key measures for guaranteeing the safe operation of a power grid. The wire tightening operation is a link which most directly influences the stress state of the wire in reinforcement construction, and the quality of the wire tightening operation directly determines the reinforcement effect and the long-term reliability of the wire. The experience positioning mode commonly adopted in the current line tightening construction is mainly used for judging the sensitivity of adjustment according to the distance between the clamping position and the outlet of the strain clamp, and the sag adjustment response is quicker when the position is considered to be closer to the outlet. However, this determination ignores the stiffness variation characteristics of the wire at the strain clamp exit section. For example, the prior patent discloses a design method for overhead transmission line tightening construction, a device, a terminal and a storage medium, with publication number CN113594966B, and discloses a design method for tightening construction, which is based on parameter data to calculate the maximum sag of a wire and consider the influence of a strain insulator string, and has the problems that the rigidity change characteristic of the wire at an outlet section of a strain clamp is ignored, so that the clamping position is selected improperly to cause stress superposition and strain concentration. When the clamping position is too close to the outlet, local compression force generated by clamping can be overlapped with the restraining force of the wire clamp in the same section, so that the wire can generate sharp bending angle change at the position, and a concentrated area with sharp increase of strain is formed on the surface of the aluminum strand. This strain concentration is far more prone to initiate micro crack propagation than even bending at a slightly remote location, thereby accelerating bending fatigue damage of the wire. In the actual wire tightening process, constructors face the contradiction that in order to enable sag adjustment to be more direct and effective, the wire tightening clamp is required to be close to the outlet of the strain clamp as much as possible, but once the positions are too close, the stress superposition effect caused by the stiffness transition of the outlet section is obviously amplified, the local bending degree of a wire is rapidly increased, the surface strain distribution of an aluminum strand is changed from uniform to steep gradient, and the fatigue damage risk is greatly increased. The opposite phenomenon that the closer the wire is, the more direct the wire is adjusted and the closer the wire is, the more easily damaged is, so that a construction site cannot accurately judge which specific position can meet the sag adjustment requirement, and the damage of the wire can be controlled within an acceptable range. For example, when a constructor sets the wire clamp at a position only 20 cm away from the outlet, although the sag adjustment amplitude response is fast, the bending angle of the wire at the outlet section is suddenly increased to be approximately 30 degrees within a range of a few cm, the strain value of the outer layer of the aluminum strand is rapidly increased to be more than 0.8% from 0.15% of the normal area, obvious strain steep increasing bands are formed, and early strand breakage is easily generated under the repeated action of local high strain. Therefore, the response speed of sag adjustment and the control of local bending fatigue damage of the lead at the outlet section are simultaneously considered in the line tightening operation, and the key problem that stress superposition and strain concentration become the current wind prevention reinforcement construction quality control due to improper clamping position selection is avoided. Disclosure of Invention The invention provides a power transmission line wind-proof reinforcement construction operation state evaluation method, which comprises the following steps: a clamping force acquisition module and a strain probe are deployed in the sag adjustment monitoring device, a distance value of a clamping point from an outlet of a strain clamp, a contact pressure of a clamping section, a wire deflection angle and a strain gradient value of the surface of an aluminum strand are obtained, and an initial clamping position data set is established; analyzing the distance value of the clamping point from