A method for force analysis and monitoring of a conductor under icing condition

Abstract

The application discloses a kind of ice-coated state wire stress analysis and monitoring method, it is related to the technical field of wire monitoring.In detecting ice-melting signs, obtain the wire state data in the ice-melting trigger window, form the before-and-after photos section, and calculate the ice-melting morphology index, stress release index and stress transmission closure index accordingly, further obtain the ice-melting rebound risk index, for judging whether ice-melting corresponds to real stable recovery.The system no longer only depends on ice thickness reduction, static tension drop or sag recovery to cancel the early warning, but comprehensively judges whether ice-melting morphology is stable, stress release is convergent and cross-pole disturbance is closed;When there is local shedding, segmented residual, eccentric residual or cross-pole stress transfer, continue to extend the early warning or trigger inspection, thereby identifying the secondary risk caused by ice-melting rebound, residual ice eccentric load and stress redistribution, reducing the possibility of early cancellation of early warning and missed chain stress anomaly.

Description

Technical Field

[0001] This invention relates to the field of conductor monitoring technology, specifically to a method for analyzing and monitoring the stress on conductors under icing conditions. Background Technology

[0002] As transmission lines extend into mountainous, cold, and meteorological regions, conductors are prone to icing under conditions of low temperatures, freezing rain, rime, and wet snow. Icing increases the weight per unit length of conductors, further causing problems such as increased conductor tension, sag changes, insulator string misalignment, and unbalanced tower loads. To promptly monitor the operational safety of lines under icing conditions, current technologies typically deploy meteorological sensors, tension sensors, tilt sensors, image acquisition devices, or icing monitoring devices along transmission lines. These devices first collect data on ambient temperature, humidity, wind speed, wind direction, conductor images, conductor tension, and conductor sag. Then, based on changes in the conductor's outer contour, estimated ice thickness, or measured ice weight, they determine whether icing has occurred. The ice thickness, ice weight, wind load, and conductor parameters are then incorporated into a stress analysis model to calculate current conductor tension changes, sag changes, and tower load imbalances. Furthermore, the calculated stress state will be compared with the preset safety threshold. When the tension, sag, tower tilt, or ice thickness exceeds the warning conditions, the icing risk warning result will be output. When the temperature rises, the ice thickness decreases, the tension decreases, or the sag recovers, it is generally considered that the line icing risk is weakening, thus providing a basis for operation and maintenance inspection, ice melting control, and line scheduling.

[0003] However, the above methods mainly focus on the process of conductor stress changing with increasing icing load during the icing formation or intensification stage. Their judgment logic typically assumes that increased icing corresponds to higher risk and decreased icing corresponds to lower risk. But in actual operation, the icing process is not necessarily continuous, uniform, or stable. Ice layers may experience localized detachment, segmented melting, eccentric residue, or asynchronous icing in adjacent spans due to temperature rise, wind vibration, or current thermal effects. When a localized icing segment suddenly detaches, the conductor's original static force balance is instantly disrupted, potentially causing conductor rebound, tension wave transmission, insulator string oscillation, and force redistribution in adjacent spans. When some residual ice remains biased and attached to one side of the conductor or a localized section, even if the overall icing thickness has decreased, new eccentric loads or discontinuous loads may still form. At this point, if the risk of the line is reduced based solely on the decrease in the current ice thickness, the decrease in static tension, or the recovery of the sag surface, it is easy to mistake the transient stress disturbance during the ice removal process as a safe recovery. It is difficult to identify the secondary stress risk caused by the combined effects of ice removal impact, residual ice load, and cross-span stress transfer in a timely manner. This can lead to problems such as prematurely lifting the warning, underestimating the structural risk of the conductor, and failing to detect the cascading stress anomalies after local ice removal. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art and to propose a method for analyzing and monitoring the stress on conductors under icing conditions.

[0005] In terms of implementation, this invention provides a method for analyzing and monitoring the stress on a conductor under icing conditions, the method comprising:

[0006] S1: Obtain conductor status data within the ice receding trigger window to form a comparison segment before and after receding;

[0007] S2: Identify the icing retreat morphology based on the icing retreat control fragment, and calculate the retreat morphology index as the retreat morphology result;

[0008] S3: Extract the conductor force release trajectory based on the comparison fragments before and after the extinction, and calculate the force release index as the force release trajectory result;

[0009] S4: Identify the cross-gear force transmission state based on the comparison fragments before and after the extinction, and calculate the force transmission closure index as the force transmission closure result;

[0010] S5: Calculate the de-icing rebound risk index based on the results of the fading pattern, the force release trajectory, and the force transmission closure, generate the fading recovery discrimination result, and determine the early warning cancellation or continuation strategy based on the fading recovery discrimination result.

[0011] Optionally, the steps for acquiring conductor status data within the icing retreat trigger window and forming a comparison segment before and after icing retreat are as follows:

[0012] Real-time acquisition of ice thickness sequence, conductor image sequence, conductor tension sequence, conductor sag sequence, conductor vibration sequence, insulator string swing angle sequence, and ambient temperature sequence of the target span conductor;

[0013] The ice thickness, conductor image contour width, conductor tension, and ambient temperature values ​​are sequentially read at a preset sampling period between two adjacent sampling times. The next sampling time is determined as the ice reflux trigger time when any of the following conditions are met: the ice thickness decreases relative to the previous sampling time; the conductor image contour width decreases relative to the previous sampling time; the conductor tension decreases relative to the previous sampling time and the ambient temperature increases relative to the previous sampling time.

[0014] Using the icing retreat trigger time as the time reference point, a retreat transition window is determined according to a preset pre-transition duration and a preset post-transition duration. The start time of the retreat transition window is before the icing retreat trigger time, and the end time of the retreat transition window is after the icing retreat trigger time, with the icing retreat trigger time located within the retreat transition window. The conductor status data within the retreat transition window is defined as the data segment during retreat. The conductor status data within a preset first duration before the start time of the retreat transition window is defined as the pre-retreat data segment. The conductor status data within a preset second duration after the end time of the retreat transition window is defined as the post-retreat data segment.

[0015] The data segments before, during, and after the icing are spliced ​​together according to their sampling time. The end time of the data segment before icing is earlier than the start time of the data segment during icing, and the end time of the data segment during icing is earlier than the start time of the data segment after icing. During the splicing process, the conductor status data in each data segment are arranged and aligned in ascending order according to the sampling timestamp. When there are data records with the same sampling timestamp, only one conductor status record is retained. The conductor status data includes icing thickness data, conductor image data, conductor tension data, conductor sag data, conductor vibration data, and insulator string swing angle data.

[0016] Based on the alignment results, the ice thickness value, conductor image contour width value, conductor tension value, conductor sag value, conductor vibration amplitude value, insulator string swing angle value and ambient temperature value corresponding to the same sampling time are combined into a conductor status record;

[0017] According to the time sequence of the data segments before icing subsidence, during icing subsidence, and after icing subsidence, multiple conductor status records are combined into a comparison segment before and after icing subsidence within the icing subsidence trigger window.

[0018] Optionally, the steps for calculating the regression pattern index as a regression pattern result include:

[0019] The target span conductor is divided into multiple longitudinal sampling segments along its length, and the conductor cross-section of each longitudinal sampling segment is divided into multiple circumferential sampling areas along its circumferential direction, forming multiple icing space sampling units.

[0020] Read the ice thickness of each icing space sampling unit at each sampling time, take the ice thickness at the initial sampling time before the ice melts as the initial icing reference, calculate the ice residue ratio at each sampling time, and take the minimum ice residue ratio up to the current sampling time as the ice residue lower envelope value according to the sampling time sequence.

[0021] The ice retreat increment is obtained by subtracting the ice retreat envelope value at the current sampling time from the ice retreat envelope value at the previous sampling time. Based on the cumulative result of the ice retreat increment of each ice spatial sampling unit, the half retreat time position when the cumulative retreat amount first reaches half of the total retreat amount is determined. The normalized half retreat time position is obtained by normalizing the half retreat time position.

[0022] The local detachment crack degree is calculated based on the difference in normalized semi-retreat time sequence position between adjacent icing space sampling units; the segmented residual return degree is calculated based on the number of reversals of the main retreat time sequence position along the length of the conductor in each longitudinal sampling segment; the eccentric residual offset degree is calculated based on the dispersion of the normalized semi-retreat time sequence position in the circumferential sampling area within each longitudinal sampling segment; and the sudden detachment pulse degree is calculated based on the maximum retreat percentage of the overall icing retreat amount within each sampling interval.

[0023] The local detachment fissure degree, segmented residual return degree, eccentric residual offset degree, and sudden de-icing pulse degree are fused by unweighted product to obtain the regression morphology index, and the regression morphology index is used as the regression morphology result.

[0024] Optionally, the steps for calculating the force release index as the result of the force release trajectory are as follows:

[0025] According to the sampling time sequence, the tension value, sag value, vibration amplitude value and insulator string swing angle value of the target span conductor are read from the comparison segments before and after the ice recedes. The interval normalization is performed respectively to obtain the normalized tension value, normalized sag value, normalized vibration value and normalized swing angle value at each sampling time.

[0026] For any sampling moment, multiply the values ​​after subtracting the normalized tension value, the normalized sag value, the normalized vibration value, and the normalized swing angle value, take the fourth root of the multiplication result, and then subtract the fourth root result to obtain the comprehensive residual force value at that sampling moment.

[0027] According to the sampling time sequence, the minimum value is taken from all the comprehensive residual force values ​​from the initial sampling time to the current sampling time, and used as the comprehensive residual force envelope value at the current sampling time. The comprehensive residual force value is then subtracted from the comprehensive residual force envelope value to obtain the force rebound return amount.

[0028] The rebound occupancy is obtained by performing unweighted product fusion based on the force rebound return amount at each sampling time;

[0029] The overall icing retreat amount between each adjacent sampling time is read. The icing release progress is determined based on the cumulative result of the overall icing retreat amount. The force release progress is determined based on the degree of decrease of the envelope value under comprehensive force residue relative to the comprehensive force residue value at the initial sampling time. The difference between the icing release progress and the force release progress is determined as the release misalignment amount. The release misalignment amount at each sampling time is fused by unweighted product to obtain the release misalignment retention degree.

[0030] The positive increment of the comprehensive residual force value between adjacent sampling times is determined as the comprehensive residual force rebound amount. The total ice retreat amount between adjacent sampling times is divided by the total total ice retreat amount to obtain the single-interval ice release ratio. The de-icing impact rebound ratio is determined according to the ratio relationship between the comprehensive residual force rebound amount and the single-interval ice release ratio. The de-icing impact rebound ratio is obtained by performing unweighted product fusion based on the de-icing impact rebound ratio of each adjacent sampling time.

[0031] The rebound occupancy degree, release misalignment retention degree, and overall de-icing impact rise degree are fused by unweighted product to obtain the force release index, and the force release index is used as the force release trajectory result.

[0032] Optionally, the step of identifying the cross-gap force transmission state based on the comparison fragments before and after fading, and calculating the force transmission closure index as the force transmission closure result, is as follows:

[0033] The tension, sag, vibration amplitude, and insulator string swing angle values ​​of the target span and its left and right adjacent spans at each sampling time are read, normalized, and then fused by unweighted product to obtain the comprehensive force disturbance value of each span at each sampling time.

[0034] The timing and intensity of the de-icing disturbance source are determined based on the maximum change in the comprehensive force disturbance value between adjacent sampling times of the target span.

[0035] For any adjacent span, the maximum change in the comprehensive force disturbance value after the ice removal disturbance source is extracted as the hysteresis response intensity, and the transmission imprint value of the adjacent span is determined according to the ratio between the hysteresis response intensity and the disturbance source intensity.

[0036] For any adjacent gear, read the maximum value of the combined force disturbance after the time of the ice removal disturbance source and the value of the combined force disturbance at the last sampling time, and determine the end residual ratio based on the ratio of the two.

[0037] Multiply the transfer imprint value of each adjacent span by the end residual ratio to obtain the transfer residual value of each adjacent span. Then, perform unweighted product fusion on each transfer residual value to obtain the force transfer closure index. The force transfer closure index is used as the force transfer closure result.

[0038] Optionally, the steps for calculating the de-icing rebound risk index based on the regression pattern results, force release trajectory results, and force transmission closure results are as follows:

[0039] Add the fading morphology index, the force release index, and the force transmission closure index to obtain the sum of the indices; divide the sum of the indices by three to obtain the de-icing rebound risk index.

[0040] Optionally, the steps for generating the fading and recovery discrimination result and determining the warning cancellation or continuation strategy based on the fading and recovery discrimination result are as follows:

[0041] The de-icing rebound risk index is compared with a preset risk threshold. When the de-icing rebound risk index is less than the preset risk threshold, a reliable recovery result is generated and the icing risk warning for the current target range is lifted.

[0042] When the risk index of ice rebound is not less than the preset risk threshold, a risk failure result is generated, and the icing risk warning for the current target span continues, while the conductor status data of the target span and its adjacent spans are collected.

[0043] During the period of continued icing risk warning, the de-icing rebound risk index is recalculated according to the preset review cycle, and the icing risk warning for the current target range is lifted when the recalculated de-icing rebound risk index is less than the preset risk threshold for a preset number of consecutive preset times.

[0044] When the recalculated de-icing rebound risk index remains at or above the preset risk threshold, maintain the icing risk warning for the current target gear distance and generate an inspection trigger command for the current target gear distance.

[0045] The beneficial effects of this invention are:

[0046] This invention proposes a method for analyzing and monitoring conductor stress under icing conditions. After detecting signs of icing retreat, the method acquires conductor state data within the icing retreat trigger window, forming a comparison segment before and after retreat. Based on this comparison segment, the method calculates the retreat morphology index, stress release index, and stress transmission closure index, and further obtains the de-icing rebound risk index. Thus, the method no longer judges whether the line has been safely restored based solely on the reduction of icing thickness, decrease of static tension, or recovery of sag surface. Instead, it comprehensively judges the retreat and recovery status from three aspects: whether the icing retreat morphology is stable, whether the conductor stress release is converged, and whether the cross-span disturbance is closed. Based on this method, it is possible to identify secondary risks during the icing fading stage, such as local detachment, segmented residue, eccentric residue, stress rebound, and cross-span stress transfer. When the icing rebound risk index does not meet the recovery conditions, the warning will continue or the inspection will be triggered. The warning will be lifted only after the risk has been continuously converged. This avoids misjudging transient stress disturbances as safe recovery, reduces the possibility of prematurely lifting the warning, underestimating the risk of conductor structure, and missing the cascading stress anomalies after local icing fading, and improves the reliability of line monitoring and early warning handling during the icing fading stage. Attached Figure Description

[0047] Figure 1 This is a flowchart illustrating a method for analyzing and monitoring the stress on a conductor under icing conditions, provided as an embodiment of the present invention. Detailed Implementation

[0048] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structure, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0049] This invention provides a method for analyzing and monitoring the stress on a conductor under icing conditions. See also... Figure 1 , Figure 1 This is a flowchart illustrating a method for analyzing and monitoring the stress on a conductor under icing conditions, provided as an embodiment of the present invention. The method includes the following steps:

[0050] S1: Obtain conductor status data within the ice receding trigger window to form a comparison segment before and after receding;

[0051] S2: Identify the icing retreat morphology based on the icing retreat control fragment, and calculate the retreat morphology index as the retreat morphology result;

[0052] S3: Extract the conductor force release trajectory based on the comparison fragments before and after the extinction, and calculate the force release index as the force release trajectory result;

[0053] S4: Identify the cross-gear force transmission state based on the comparison fragments before and after the extinction, and calculate the force transmission closure index as the force transmission closure result;

[0054] S5: Calculate the de-icing rebound risk index based on the results of the fading pattern, the force release trajectory, and the force transmission closure, generate the fading recovery discrimination result, and determine the early warning cancellation or continuation strategy based on the fading recovery discrimination result.

[0055] Based on the present invention, a method for analyzing and monitoring conductor stress under icing conditions is provided. After detecting signs of icing fading, the method first acquires conductor state data within the icing fading trigger window and forms a comparison segment before and after fading. Then, based on the comparison segment, it identifies whether the icing is fading uniformly, partially detached, segmented, eccentrically residual, or asynchronously fading across spans. Furthermore, it extracts the force release trajectories such as conductor tension, sag, vibration, and insulator string oscillation by combining the fading morphology results, and determines whether the conductor stress is released synchronously and smoothly during the icing reduction process. At the same time, by identifying the force transmission state between the current span and adjacent spans and calculating the force transmission closure index, it can determine whether the disturbance caused by icing or residual ice has dissipated within the current span or has spread to adjacent spans. Therefore, this scheme no longer simply considers a reduction in ice thickness, a decrease in static tension, or the recovery of sag surface as a restoration of the line's safe state. Instead, it uses the icing morphology index, the stress release index, and the stress transmission closure index to jointly calculate the ice rebound risk index. Based on the ice rebound risk index, it generates a icing recovery judgment result. The warning can only be lifted when the icing icing morphology is stable, the stress release process converges, and the cross-span disturbance is closed. In the case of local detachment, segmented residue, eccentric residue, or cross-span stress transfer, the warning continues or an inspection is triggered. This effectively identifies the secondary stress risks caused by conductor rebound, tension wave transmission, residual ice eccentricity, and the redistribution of stress in adjacent spans during the icing icing icing stage. It avoids misjudging transient stress disturbances as safe recovery, reduces the possibility of prematurely lifting the warning, underestimating conductor structural risks, and missing the cascading stress anomalies after local icing icing.

[0056] In one embodiment, S1: The step of acquiring conductor status data within the icing retreat trigger window and forming a comparison segment before and after icing retreat is as follows:

[0057] Real-time acquisition of ice thickness sequence, conductor image sequence, conductor tension sequence, conductor sag sequence, conductor vibration sequence, insulator string swing angle sequence, and ambient temperature sequence of the target span conductor;

[0058] The ice thickness, conductor image contour width, conductor tension, and ambient temperature values ​​are sequentially read at a preset sampling period between two adjacent sampling times. The next sampling time is determined as the ice reflux trigger time when any of the following conditions are met: the ice thickness decreases relative to the previous sampling time; the conductor image contour width decreases relative to the previous sampling time; the conductor tension decreases relative to the previous sampling time and the ambient temperature increases relative to the previous sampling time.

[0059] Using the icing retreat trigger time as the time reference point, a retreat transition window is determined according to a preset pre-transition duration and a preset post-transition duration. The start time of the retreat transition window is before the icing retreat trigger time, and the end time of the retreat transition window is after the icing retreat trigger time, with the icing retreat trigger time located within the retreat transition window. The conductor status data within the retreat transition window is defined as the data segment during retreat. The conductor status data within a preset first duration before the start time of the retreat transition window is defined as the pre-retreat data segment. The conductor status data within a preset second duration after the end time of the retreat transition window is defined as the post-retreat data segment.

[0060] The data segments before, during, and after icing are spliced ​​together according to their sampling time. The end time of the data segment before icing is earlier than the start time of the data segment during icing, and the end time of the data segment during icing is earlier than the start time of the data segment after icing. During the splicing process, the conductor status data in each data segment are arranged and aligned in ascending order according to the sampling timestamp. When data records with the same sampling timestamp exist, only one conductor status record is retained. The conductor status data includes icing thickness data, conductor image data, conductor tension data, conductor sag data, conductor vibration data, and insulator string swing angle data. Each conductor status record is marked with either a pre-icing mark, a during-icing mark, or a post-icing mark, so that the subsequent icing morphology index, stress release index, and stress transmission closure index can distinguish the conductor status changes at different stages.

[0061] Based on the alignment results, the ice thickness value, conductor image contour width value, conductor tension value, conductor sag value, conductor vibration amplitude value, insulator string swing angle value and ambient temperature value corresponding to the same sampling time are combined into a conductor status record;

[0062] According to the time sequence of the data segments before icing subsidence, during icing subsidence, and after icing subsidence, multiple conductor status records are combined into a comparison segment before and after icing subsidence within the icing subsidence trigger window.

[0063] It should be noted that the conductor status data for the target span is obtained through monitoring devices installed on the towers at both ends of the target span, the conductor body, the insulator string, and the side of the line corridor. Specifically, the icing thickness sequence is obtained by an icing thickness monitoring device or an image acquisition device. The icing thickness monitoring device is set near the conductor suspension points of the towers at both ends of the target span, or on a monitoring bracket near the middle of the conductor within the target span, to collect changes in the conductor's outer contour or icing detection signals. The conductor image sequence is obtained by an image acquisition device set on the tower crossarm, tower passage side, or UAV inspection platform. The image acquisition device's shooting direction is towards the conductor of the target span, and at least one section of the conductor contour is within the image's field of view. The conductor tension sequence is obtained by a tension sensor set at tension clamps, suspension clamps, insulator string suspension points, or tower connection hardware, to collect changes in the tension transmitted from the conductor of the target span to the tower suspension points. The conductor sag sequence is obtained by an image ranging device, laser ranging device, or a positioning device installed at a marker point in the middle of the conductor, to determine the height change of the lowest point of the conductor of the target span or a preset monitoring point relative to the line connecting the tower suspension points. The conductor vibration sequence is obtained by a device set on the conductor... Accelerometers near the conductor body, spacers, vibration dampers, or clamps are used to collect the vibration amplitude of the conductor before and after the ice recedes. The insulator string swing angle sequence is obtained by tilt sensors located at the ends of the insulator strings or at the insulator string connecting hardware, or by an image acquisition device identifying the deflection angle of the insulator string axis relative to the vertical direction. The ambient temperature sequence is obtained by micro-meteorological sensors installed on the towers corresponding to the target span. When it is necessary to identify the cross-span force transmission state, tension acquisition units, sag acquisition units, vibration acquisition units, and insulator string swing angle acquisition units of the same type as the target span are set at the left and right adjacent spans of the target span, respectively. Alternatively, tension sensors and tilt sensors are set at the conductor suspension points of the towers at both ends of the target span and their adjacent towers, and combined with an image acquisition device facing the conductors of adjacent spans to obtain sag and vibration changes, so that after the ice recedes or partially melts in the target span, the hysteresis force response data of the adjacent spans can be obtained synchronously.

[0064] In this step, continuous monitoring data is first established for the target span conductor. After collecting this continuous data, the data from two adjacent sampling times are compared according to a preset sampling period. For example, the current ice thickness, conductor image contour width, conductor tension, and ambient temperature are read every minute. When the ice thickness decreases, the conductor image contour width decreases, or the conductor tension decreases and the ambient temperature increases at the next sampling time compared to the previous sampling time, it indicates that the conductor may have entered the stage of ice melting, detachment, or receding. Therefore, the next sampling time is determined as the ice receding trigger time. Subsequently, this ice receding trigger time is used as the trigger time. Centered on the trigger moment, data from a period before the trigger moment is extracted as the pre-dissipation data segment, used to characterize the conductor state when the icing has not yet significantly dissipated. Data from a period after the trigger moment is extracted as the post-dissipation data segment, used to characterize the conductor state after the icing has dissipated. Simultaneously, data from a period including the trigger moment itself is extracted as the mid-dissipation data segment, used to characterize the transition state when the icing changes from stable adhesion to dissipation. Then, the pre-dissipation, mid-dissipation, and post-dissipation data segments are arranged in chronological order, and the icing thickness values ​​and conductor images collected at the same sampling moment are aligned using timestamps. Contour width, tension, sag, vibration amplitude, insulator string swing angle, and ambient temperature are mapped to the same conductor status record to avoid data mismatch caused by inconsistent sampling times of different sensors. For example, in a mountainous transmission line, conductor status data are continuously collected at 10:00, 10:01, and 10:02. If, at 10:01 compared to 10:00, the conductor image contour width decreases, the ice thickness decreases, and the ambient temperature rises from -1°C to above 0°C, then 10:01 is determined as the trigger time for ice thawing, and continuous data before 10:01 and transitional data near 10:01 are extracted. Based on the data and continuous data after 10:01, data segments before, during, and after ice dissipation were formed. Then, the ice thickness, conductor profile width, tension, sag, vibration, insulator string swing angle, and temperature at each time point were combined into multiple conductor state records, ultimately forming a comparison segment before and after ice dissipation. Through this processing method, subsequent steps can determine whether the ice melts smoothly or falls off locally based on the multi-source state changes within the same time window, and further analyze whether the conductor stress rebounds, is disturbed, or is transmitted across spans before and after ice dissipation, rather than directly assuming that the line risk has decreased simply because the ice thickness decreases at a certain moment.

[0065] It should be noted that the aforementioned conductor status data are not limited to those directly acquired by a single sensor. When the conductor sag value is not directly output by the sag sensor, it can be obtained by identifying the lowest point of the conductor using an image acquisition device and calculating it in conjunction with the tower suspension point position. When the icing thickness value is not directly output by the icing thickness sensor, it can be obtained by converting the difference between the conductor's outer contour width in the conductor image and the conductor's reference width in the non-iced state. When the insulator string swing angle is not directly output by the tilt sensor, it can be obtained by identifying the insulator string's axial direction using an image acquisition device and calculating its deflection angle relative to the vertical direction. Therefore, even if some data in the target span is obtained through image recognition, positioning measurement, or direct sensor acquisition, a conductor status record that meets the requirements of subsequent calculations can still be formed.

[0066] In one embodiment, S2: Identify the icing morphology based on the icing morphology control fragment and calculate the icing morphology index as the icing morphology result;

[0067] In one implementation, the calculation steps for the fading morphology index are as follows:

[0068] Identify icing retreat morphology based on icing retreat control fragments, and calculate the retreat morphology index as the retreat morphology result, including:

[0069] The target span conductor is divided into multiple longitudinal sampling segments along its length, and the conductor cross section corresponding to each longitudinal sampling segment is divided into multiple circumferential sampling areas along its circumferential direction. Multiple icing space sampling units are determined by the longitudinal sampling segments and the circumferential sampling areas.

[0070] According to the sampling time sequence in the ice receding control segment, the ice thickness of each ice space sampling unit at each sampling time is read, and the ice thickness of each ice space sampling unit at the initial sampling time before receding is used as the initial ice base of the corresponding ice space sampling unit.

[0071] For any icing space sampling unit, the icing thickness of the icing space sampling unit at each sampling time is divided by the initial icing reference of the icing space sampling unit to obtain the icing residual ratio of the icing space sampling unit at each sampling time; when the icing thickness of an icing space sampling unit at the initial sampling time before fading is zero, the icing space sampling unit is excluded from the calculation of the fading morphology index.

[0072] For any icing space sampling unit, in the order of sampling time, the minimum value is taken from all the icing residue ratios from the initial sampling time before dissipation to the current sampling time, and this minimum value is taken as the icing residue envelope value of the icing space sampling unit at the current sampling time. The non-recoverable dissipation trajectory of the icing space sampling unit is formed by the icing residue envelope values ​​at each sampling time.

[0073] For any icing space sampling unit, the icing residual envelope value at the previous sampling time is subtracted from the icing residual envelope value at the current sampling time to obtain the icing retreat increment of the icing space sampling unit between two adjacent sampling times, and the icing retreat increment between each adjacent sampling time forms the retreat increment sequence of the icing space sampling unit.

[0074] For any icing space sampling unit, the icing retreat increment of the icing space sampling unit between all adjacent sampling times is added together to obtain the total retreat amount of the icing space sampling unit within the icing retreat trigger window.

[0075] For any icing space sampling unit, the icing retreat increment of the icing space sampling unit is accumulated according to the sampling time sequence. When the accumulated icing retreat amount reaches half of the total retreat amount of the icing space sampling unit for the first time, the corresponding sampling number is determined as the half retreat time sequence position of the icing space sampling unit.

[0076] Divide the semi-fading timing bit of each icing space sampling unit by the total number of sampling intervals within the icing fading trigger window to obtain the normalized semi-fading timing bit of each icing space sampling unit, and form a fading timing bit map from the normalized semi-fading timing bits of each icing space sampling unit.

[0077] The fading timing difference between adjacent icing space sampling units is determined based on the fading timing bit map. The adjacent icing space sampling units include icing space sampling units adjacent in the conductor length direction and icing space sampling units adjacent in the conductor circumferential direction. The fading timing difference is the absolute value of the difference between the normalized half-fading timing bits of two adjacent icing space sampling units.

[0078] For all adjacent icing space sampling units, the values ​​corresponding to each adjacent icing space sampling unit after subtracting the fading time difference are multiplied together. The result of the multiplication is taken as the power root corresponding to the number of adjacent relationships, and the result of the power root is subtracted to obtain the local detachment crack degree.

[0079] For each longitudinal sampling segment, read the normalized half-fading timing bits corresponding to all circumferential sampling areas within the longitudinal sampling segment, and take the median as the main fading timing bit of the longitudinal sampling segment;

[0080] The main fading time position of two adjacent longitudinal sampling segments is compared sequentially along the length of the conductor. When the main fading time position of the later longitudinal sampling segment is greater than that of the earlier longitudinal sampling segment, the corresponding main fading direction sign is marked as positive. When the main fading time position of the later longitudinal sampling segment is less than that of the earlier longitudinal sampling segment, the corresponding main fading direction sign is marked as negative. When the two are equal, the corresponding main fading direction sign is marked as zero.

[0081] Compare the signs of two adjacent main fading directions sequentially along the length of the conductor. When the product of the signs of two adjacent main fading directions is less than zero, it is determined that a main fading direction reversal has occurred at that position. Count the total number of main fading direction reversals and divide the number of main fading direction reversals by the total number of longitudinal sampling segments minus two to obtain the segmented residual return degree.

[0082] For each longitudinal sampling segment, read the normalized semi-fading time sequence bits corresponding to all circumferential sampling areas within the longitudinal sampling segment, and subtract the minimum value from the maximum value to obtain the circumferential fading difference value of the longitudinal sampling segment.

[0083] For all longitudinal sampling segments, multiply the values ​​corresponding to each longitudinal sampling segment after subtracting the circumferential fading difference value, take the root of the result corresponding to the total number of longitudinal sampling segments, and subtract the root result to obtain the eccentric residual bias.

[0084] For each adjacent sampling time, the ice retreat increments of all icing space sampling units between the adjacent sampling times are added together to obtain the overall ice retreat amount between the adjacent sampling times;

[0085] The total icing reduction amount between all adjacent sampling times is added together to obtain the total overall icing reduction amount within the icing reduction trigger window.

[0086] The maximum value is selected from the total icing retreat between all adjacent sampling times, and the maximum value is divided by the total total icing retreat to obtain the maximum retreat percentage.

[0087] Multiply the total number of sampling intervals by the maximum fading percentage, subtract one, and then divide by the value after subtracting one from the total number of sampling intervals to obtain the sudden de-icing pulse degree.

[0088] Multiply the values ​​after subtracting the local detachment fissure degree, the segmented residual return degree, the eccentric residual offset degree, and the sudden detachment pulse degree, take the fourth root of the product, and subtract the fourth root result to obtain the regression morphology index.

[0089] The fading pattern index is used as the fading pattern result. The fading pattern index is a dimensionless quantity between zero and one. The larger the fading pattern index, the greater the deviation of the icing fading pattern from the uniform and continuous fading pattern.

[0090] It should be noted that the icing morphology index is used to measure the degree of deviation of the icing morphology from the stable icing state during the icing icing icing process. Specifically, it is used to characterize the continuity of icing icing icing along the conductor length, the uniformity of icing icing icing along the conductor cross-section circumferentially, the gentleness of icing ... Because the force balance of a conductor under icing conditions depends on the relatively stable spatial and temporal distribution of the icing load, when the icing recedes through localized detachment, segmented residue, or eccentric residue, the original force balance of the conductor will be released asynchronously. This can easily lead to sudden changes in local load, uneven cross-sectional load, discontinuous force between sections, and delayed force response between adjacent spans. Therefore, a larger receding morphology index usually corresponds to a larger risk index for ice rebound, indicating that although the icing is decreasing, the conductor's force state is more likely to be unstable and prone to recovery. In other words, the receding morphology index is not used to measure the amount of remaining icing, but rather to measure the degree of abnormality in the icing receding morphology. An increase in its value indicates an increase in spatial discontinuity, circumferential imbalance, and temporal abruptness during the icing receding process, thus increasing the likelihood of subsequent conductor rebound, uneven ice load, and cross-span force transmission. Therefore, in the subsequent calculation of the de-icing rebound risk index, the fading pattern index can be used as an input to reflect the strength of the disturbance at the source of icing fading, so as to avoid the conclusion that the line risk has been reduced based solely on the decrease in icing thickness, the decrease in static tension, or the recovery of sag.

[0091] In one embodiment, S3: The step of extracting the conductor force release trajectory based on the comparison fragments before and after fading, and calculating the force release index as the force release trajectory result is as follows:

[0092] From the comparison segments before and after the ice recedes, the conductor tension value, conductor sag value, conductor vibration amplitude and insulator string swing angle value of the target span conductor at each sampling time are read in the sampling time sequence to form conductor tension sequence, conductor sag sequence, conductor vibration sequence and insulator string swing angle sequence respectively;

[0093] The maximum and minimum values ​​of the conductor tension sequence, conductor sag sequence, conductor vibration sequence, and insulator string swing angle sequence are read separately. The normalized tension value is obtained by subtracting the minimum value of the conductor tension sequence from the conductor tension value at each sampling time and then dividing by the difference between the maximum and minimum values ​​of the conductor tension sequence. Similarly, the normalized sag value is obtained by subtracting the minimum value of the conductor sag sequence from the conductor sag value at each sampling time and then dividing by the difference between the maximum and minimum values ​​of the conductor sag sequence. The normalized vibration value is obtained by subtracting the minimum value of the conductor vibration sequence from the conductor vibration amplitude at each sampling time and then dividing by the difference between the maximum and minimum values ​​of the conductor vibration sequence. The normalized swing angle value is obtained by subtracting the minimum value of the insulator string swing angle sequence from the insulator string swing angle value at each sampling time and then dividing by the difference between the maximum and minimum values ​​of the insulator string swing angle sequence. When the maximum and minimum values ​​of any sequence are equal, the normalized values ​​for each sampling time corresponding to that sequence are set to zero.

[0094] For any sampling moment, the following values ​​are multiplied together: the value after subtracting the normalized tension value, the value after subtracting the normalized sag value, the value after subtracting the normalized vibration value, and the value after subtracting the normalized swing angle value. The fourth root of the multiplication result is then taken, and the fourth root result is subtracted from the first value to obtain the comprehensive residual force value at that sampling moment. The comprehensive residual force values ​​at each sampling moment are arranged in the order of sampling time to form the comprehensive residual force trajectory.

[0095] For any sampling time, the minimum value among all residual comprehensive forces from the initial sampling time to the current sampling time is taken as the lower envelope value of the residual comprehensive forces at the current sampling time, according to the sampling time sequence.

[0096] For any sampling time, the force rebound return amount at that sampling time is obtained by subtracting the comprehensive residual force envelope value at that sampling time from the comprehensive residual force value at that sampling time.

[0097] Multiply the values ​​corresponding to each sampling time by subtracting the force rebound amount, take the root of the result corresponding to the total number of sampling times, and subtract the root result to obtain the rebound occupancy.

[0098] The overall ice reduction amount of the target span conductor between each adjacent sampling time is read from the comparison segment before and after ice reduction. The overall ice reduction amount is accumulated according to the sampling time sequence. The cumulative ice reduction amount up to the current sampling time is divided by the total ice reduction amount in the ice reduction trigger window to obtain the ice release progress at the current sampling time.

[0099] Subtract the residual comprehensive force envelope value at the current sampling time from the residual comprehensive force value at the initial sampling time, and then divide by the residual comprehensive force value at the initial sampling time to obtain the force release progress at the current sampling time; when the residual comprehensive force value at the initial sampling time is zero, the force release progress at the current sampling time is determined as one.

[0100] For any sampling time, the ice release progress at that sampling time is subtracted from the force release progress at that sampling time. If the difference is greater than zero, the difference is determined as the release misalignment amount. If the difference is not greater than zero, the release misalignment amount is determined as zero.

[0101] Multiply the values ​​corresponding to each sampling time after subtracting the release misalignment amount, take the root of the result corresponding to the total number of sampling intervals, and subtract the root result to obtain the release misalignment retention degree.

[0102] For any adjacent sampling time, the comprehensive residual force value of the next sampling time is subtracted from the comprehensive residual force value of the previous sampling time. When the difference is greater than zero, the difference is determined as the comprehensive residual force rebound amount. When the difference is not greater than zero, the comprehensive residual force rebound amount is determined as zero.

[0103] For any adjacent sampling time, divide the total amount of icing reduction between the adjacent sampling time by the total amount of icing reduction within the icing reduction trigger window to obtain the icing release ratio per interval;

[0104] For any adjacent sampling time, the comprehensive residual rebound amount corresponding to the adjacent sampling time is divided by the sum of the comprehensive residual rebound amount and the corresponding single-interval ice release ratio to obtain the de-icing impact rebound ratio; when the sum of the comprehensive residual rebound amount and the corresponding single-interval ice release ratio is zero, the corresponding de-icing impact rebound ratio is determined to be zero.

[0105] Multiply the values ​​corresponding to each adjacent sampling time after subtracting the de-icing impact rise ratio, take the root of the multiplication result corresponding to the total number of sampling intervals, and use the result of subtracting the root to obtain the overall de-icing impact rise degree.

[0106] Multiply the values ​​after subtracting the rebound occupancy degree, the release misalignment retention degree, and the overall ice-breaking impact rise degree by one. Take the cube root of the product and subtract the cube root to obtain the force release index. Use the force release index as the force release trajectory result.

[0107] It should be noted that the stress release index is used to measure the degree of deviation of the conductor's stress state from the stable release state after the ice recedes. Specifically, it characterizes whether the conductor tension, sag, vibration amplitude, and insulator string swing angle decrease synchronously, converge smoothly, and remain in a low-disturbance state as the ice recedes. The smaller the stress release index, the more stable the conductor stress release process is, indicating that the conductor tension, sag, vibration, and insulator string swing angle can decrease synchronously after the ice load decreases, and there is no obvious rebound, stagnation, or impact response after the decrease. The larger the stress release index, the more stable the conductor stress release process is, indicating that although the ice has receded, the conductor stress state has not recovered synchronously with the ice receding process, or there are phenomena such as tension rebound, abnormal sag changes, increased vibration, or amplified insulator string swing angle after the stress has decreased. Since the risk of ice rebound essentially reflects whether the conductor's stress undergoes secondary disturbance, delayed recovery, or reverse enhancement after the ice recedes, a larger stress release index usually indicates a larger risk of ice rebound. This is because the receding ice should reduce the additional load on the conductor. If the conductor tension, sag, vibration, and swing angle converge synchronously at this time, it indicates that there is consistency between the release of ice load and the conductor's structural response, and the possibility of rebound impact or subsequent transmission is low. Conversely, if the ice has decreased but the overall residual stress remains at a high level, or if the overall residual stress increases again after decreasing, it indicates that there are still unreleased loads affecting the conductor's stress state, transient impacts caused by ice removal, or lag in structural response. Such states are more likely to further develop into conductor rebound, amplified insulator string swing, or stress response in adjacent spans. For example, within a target span, if the ice thickness continuously decreases while the tension, sag, vibration amplitude, and insulator string swing angle also gradually decrease and remain stable over time, the stress release index is relatively small, indicating that the stress recovery corresponding to this icing process is reliable. Conversely, if after a significant decrease in ice thickness, the tension drops briefly but then rebounds, or the vibration amplitude and insulator string swing angle increase, the stress release index is relatively large, indicating that the icing fading has not corresponded to a stable stress recovery, and the subsequent ice rebound risk index should increase accordingly. Therefore, the stress release index is not used to measure the magnitude of ice fading, but rather to measure the degree of stable release of conductor stress response after ice fading. A higher index indicates a more incomplete, asynchronous, or rebound-impact-like stress release process, thus providing direct evidence of the stress state for the subsequent ice rebound risk index.

[0108] In one embodiment, S4: Identify the cross-gap force transmission state based on the comparison segments before and after fading, and calculate the force transmission closure index as the force transmission closure result, including:

[0109] Read the conductor tension, conductor sag, conductor vibration amplitude, and insulator string swing angle values ​​in the comparison segments before and after the target span and its left and right adjacent spans. Then, perform interval normalization on the conductor tension, conductor sag, conductor vibration amplitude, and insulator string swing angle values ​​for each span to obtain the normalized tension, normalized sag, normalized vibration, and normalized swing angle values ​​for each span at each sampling time.

[0110] For any gear length at any sampling time, multiply the values ​​after subtracting the normalized tension value, the value after subtracting the normalized sag value, the value after subtracting the normalized vibration value, and the value after subtracting the normalized swing angle value. Take the fourth root of the multiplication result and subtract the fourth root result to obtain the comprehensive force disturbance value of the gear length at the sampling time.

[0111] For the target span, the difference between the comprehensive force disturbance values ​​of two adjacent sampling times is taken and the absolute value is obtained to obtain the comprehensive force disturbance change of the target span between each adjacent sampling time. The next sampling time corresponding to the sampling interval with the largest comprehensive force disturbance change is determined as the ice removal disturbance source time, and the largest comprehensive force disturbance change is determined as the disturbance source intensity.

[0112] For any adjacent span, after the ice removal disturbance source time, the difference between the comprehensive force disturbance values ​​of two adjacent sampling times is taken and the absolute value is obtained to obtain the changes in the comprehensive force disturbance of the adjacent span after the ice removal disturbance source time, and the maximum value is determined as the hysteresis response intensity of the adjacent span.

[0113] For any adjacent gear length, the hysteresis response strength of the adjacent gear length is divided by the sum of the hysteresis response strength of the adjacent gear length and the disturbance source strength to obtain the transmission imprint value of the adjacent gear length; when the sum of the hysteresis response strength of the adjacent gear length and the disturbance source strength is zero, the transmission imprint value of the adjacent gear length is determined to be zero.

[0114] For any adjacent span, after the de-icing disturbance source time, read the maximum value of the comprehensive force disturbance value of the adjacent span and the comprehensive force disturbance value at the last sampling time. Divide the comprehensive force disturbance value at the last sampling time by the maximum value to obtain the end residual ratio of the adjacent span; when the maximum value is zero, the end residual ratio of the adjacent span is determined to be zero.

[0115] For any adjacent gap, the transfer imprint value of the adjacent gap is multiplied by the end residual ratio to obtain the transfer residual value of the adjacent gap.

[0116] Multiply the values ​​corresponding to each adjacent gear length by subtracting the transfer residual value, take the root of the result corresponding to the number of adjacent gear lengths, and subtract the root result to obtain the cross-gear transfer residual.

[0117] The residual value of cross-gear transfer is determined as the force transfer closure index, and the force transfer closure index is used as the force transfer closure result.

[0118] It should be noted that the force transmission closure index is used to measure the degree to which the force disturbance generated by the target span after icing recedes or localized de-icing is transmitted to adjacent spans and then completely dissipates. Specifically, it is used to characterize the intensity of the impact of the target span's de-icing disturbance on the left and right adjacent spans, the hysteresis significance of the adjacent spans' responses, and the degree of residual response at the end of the monitoring window. The smaller the force transmission closure index, the more the force disturbance of the target span is mainly confined within its own span, or even if it is transmitted to adjacent spans, it has gradually attenuated during subsequent sampling, indicating that the cross-span force transmission is in a closed state. The larger the force transmission closure index, the more obvious the hysteresis force response appears in adjacent spans after the target span's de-icing disturbance occurs, and the higher the disturbance level remains at the end of the monitoring window, indicating that the target span's de-icing disturbance has not completely dissipated within its own span, but has formed a non-closed cross-span transmission state. Since the risk of ice rebound depends not only on whether the target span itself rebounds, but also on whether the rebound disturbance continues to affect adjacent spans, the larger the force transmission closure index, the greater the risk index of ice rebound. This is because if the tension changes, sag changes, vibration changes, or insulator string swing changes caused by local ice removal in the target span can be rapidly attenuated within the span, the impact of the ice removal event on the overall line structure is small, and the possibility of subsequent chain-related force anomalies is low. Conversely, if after the main disturbance occurs in the target span, adjacent spans show obvious tension fluctuations, sag disturbances, increased vibration, or swing angle changes in subsequent moments, and the comprehensive force disturbance of the adjacent spans has not been significantly reduced at the end of the monitoring window, it indicates that the ice removal disturbance has been transmitted outward through the mechanical connection relationship of the conductor, hardware, insulator string, or tower suspension point, and the line's stress state has not yet been stabilized and restored. For example, if a target span experiences localized de-icing at a certain moment, resulting in the largest change in its overall force disturbance value, but the adjacent spans on either side do not subsequently show a significant response, or only a short-term response that essentially decays at the end of the monitoring window, then the force transmission closure index is small, indicating that the de-icing disturbance has not formed a sustained cross-span impact. Conversely, if after the target span experiences de-icing disturbance, the adjacent span on the right shows a large change in overall force disturbance at subsequent sampling times, and this disturbance remains at a high level until the end of the monitoring window, then the force transmission closure index is large, indicating that the de-icing disturbance has not completely closed and dissipated, and there is a possibility of further expansion into cross-span force anomalies. Therefore, the force transmission closure index is not used to measure the instantaneous force magnitude of a single span, but rather to measure the degree of non-closure in the transmission of de-icing disturbances in multi-span connection structures; an increase in its value indicates an increase in cross-span transmission intensity and the degree of residual disturbance at the end, thus providing a basis for judging the cross-span diffusion level for the subsequent de-icing rebound risk index.

[0119] In one embodiment, S5: Calculate the de-icing rebound risk index based on the fading pattern result, the force release trajectory result, and the force transmission closure result, generate the fading recovery discrimination result, and determine the warning cancellation or continuation strategy based on the fading recovery discrimination result.

[0120] In one implementation method, the steps for calculating the de-icing rebound risk index based on the regression pattern results, the force release trajectory results, and the force transmission closure results are as follows:

[0121] The icing morphology index, stress release index, and stress transmission closure index are added together to obtain the sum of the indices. The sum of the indices is divided by three to obtain the ice-rebound risk index. The ice-rebound risk index is a dimensionless quantity between zero and one. The larger the ice-rebound risk index, the greater the comprehensive risk of ice-rebound, unstable stress release, and non-closure of cross-span stress transmission in the conductor during the ice icing fading stage.

[0122] In one implementation, the steps of generating a fading and recovery judgment result and determining the warning cancellation or continuation strategy based on the fading and recovery judgment result are as follows:

[0123] The ice rebound risk index is compared with a preset risk threshold. When the ice rebound risk index is less than the preset risk threshold, a reliable recovery result is generated, and the icing risk warning for the current target span is lifted. When the ice rebound risk index is not less than the preset risk threshold, a risk not yet resolved result is generated, and the icing risk warning for the current target span continues. At the same time, conductor status data for the target span and its adjacent spans are continuously collected. During the period of continued icing risk warning, the ice rebound risk index is recalculated according to a preset review cycle. When the recalculated ice rebound risk index is less than the preset risk threshold for a preset number of consecutive times, the icing risk warning for the current target span is lifted. When the recalculated ice rebound risk index is consistently not less than the preset risk threshold, the icing risk warning for the current target span is maintained, and an inspection trigger command for the current target span is generated.

[0124] It should be noted that the ice rebound risk index is compared with the preset risk threshold. If the ice rebound risk index is less than the preset risk threshold, it indicates that the current ice receding pattern, conductor stress release state, and cross-span stress transmission state comprehensively indicate that the conductor has entered a relatively stable recovery state. Therefore, a reliable recovery result is generated, and the ice risk warning for the current target span is lifted. If the ice rebound risk index is not less than the preset risk threshold, it indicates that although conductor ice may have decreased, there are still risk factors such as local ice receding, insufficient stress release, vibration rebound, residual ice off-center loading, or disturbance propagation. Therefore, a risk not receded result is generated, the current ice risk warning is not lifted, and conductor status data for the target span and its adjacent spans continue to be collected in order to continuously determine whether the risk has truly converged. During the warning period, the de-icing rebound risk index is recalculated according to the preset review cycle, for example, every five minutes or every ten minutes. When the recalculation results of the preset number of consecutive times are all less than the preset risk threshold, it indicates that the risk index is not a random short-term drop, but has been continuously within the safe range, and the icing risk warning for the current target span is then lifted. Conversely, if the recalculated de-icing rebound risk index is consistently not less than the preset risk threshold, it indicates that the conductor has not yet formed a stable recovery state after the icing has subsided, and the icing risk warning continues to be maintained. An inspection trigger command is generated for the current target span, so that maintenance personnel or drone inspection equipment can focus on reviewing the span. For example, if the icing thickness of a target span decreases significantly after the temperature rises, but the de-icing rebound risk index is 0.68, which is higher than the preset risk threshold of 0.50, the warning will not be lifted due to the reduction in icing. Instead, a risk not yet resolved result will be generated and monitoring will continue. Subsequently, the index will be recalculated according to the review cycle. If three consecutive results are 0.42, 0.39, and 0.36, all below 0.50, the warning will be lifted. If the consecutive results are still 0.61, 0.57, and 0.63, the warning will remain and an inspection will be triggered. This approach avoids prematurely concluding that the line is safe due to a single decrease in the index or a reduction in surface icing, ensuring that the warning is lifted only after the risk has continuously converged.

[0125] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A method for analyzing and monitoring the stress on a conductor under icing conditions, characterized in that, Includes the following steps: S1: Obtain conductor status data within the ice receding trigger window to create a comparison segment before and after ice receding; the specific steps are as follows: Real-time acquisition of ice thickness sequence, conductor image sequence, conductor tension sequence, conductor sag sequence, conductor vibration sequence, insulator string swing angle sequence, and ambient temperature sequence of the target span conductor; The ice thickness, conductor image contour width, conductor tension, and ambient temperature values ​​are sequentially read at a preset sampling period between two adjacent sampling times. The next sampling time is determined as the ice reflux trigger time when any of the following conditions are met: the ice thickness decreases relative to the previous sampling time; the conductor image contour width decreases relative to the previous sampling time; the conductor tension decreases relative to the previous sampling time and the ambient temperature increases relative to the previous sampling time. Using the icing retreat trigger time as the time reference point, a retreat transition window is determined according to a preset pre-transition duration and a preset post-transition duration. The start time of the retreat transition window is before the icing retreat trigger time, and the end time of the retreat transition window is after the icing retreat trigger time, with the icing retreat trigger time located within the retreat transition window. The conductor status data within the retreat transition window is defined as the data segment during retreat. The conductor status data within a preset first duration before the start time of the retreat transition window is defined as the pre-retreat data segment. The conductor status data within a preset second duration after the end time of the retreat transition window is defined as the post-retreat data segment. The data segments before, during, and after the fading are spliced ​​together according to the sampling time. During the splicing process, the conductor status data in each data segment are arranged and aligned in ascending order according to the sampling timestamp, and only one conductor status record is retained when there are data records with the same sampling timestamp. Based on the alignment results, the ice thickness value, conductor image contour width value, conductor tension value, conductor sag value, conductor vibration amplitude value, insulator string swing angle value and ambient temperature value corresponding to the same sampling time are combined into a conductor status record; According to the time sequence of the data segments before icing subsidence, during icing subsidence, and after icing subsidence, multiple conductor status records are combined into a comparison segment before and after icing subsidence within the icing subsidence trigger window; S2: Identify the icing retreat morphology based on the icing retreat control fragment, and calculate the retreat morphology index as the retreat morphology result; S3: Extract the conductor force release trajectory based on the comparison fragments before and after the extinction, and calculate the force release index as the force release trajectory result; S4: Identify the cross-gear force transmission state based on the comparison fragments before and after the extinction, and calculate the force transmission closure index as the force transmission closure result; S5: Calculate the de-icing rebound risk index based on the results of the fading pattern, the force release trajectory, and the force transmission closure, generate the fading recovery discrimination result, and determine the early warning cancellation or continuation strategy based on the fading recovery discrimination result.

2. The method for analyzing and monitoring the stress on a conductor under icing conditions according to claim 1, characterized in that, The steps for calculating the regression pattern index as a regression pattern result include: The target span conductor is divided into multiple longitudinal sampling segments along its length, and the conductor cross-section of each longitudinal sampling segment is divided into multiple circumferential sampling areas along its circumferential direction, forming multiple icing space sampling units. Read the ice thickness of each icing space sampling unit at each sampling time, take the ice thickness at the initial sampling time before the ice melts as the initial icing reference, calculate the ice residue ratio at each sampling time, and take the minimum ice residue ratio up to the current sampling time as the ice residue lower envelope value according to the sampling time sequence. The ice retreat increment is obtained by subtracting the ice retreat envelope value at the current sampling time from the ice retreat envelope value at the previous sampling time. Based on the cumulative result of the ice retreat increment of each ice spatial sampling unit, the half retreat time position when the cumulative retreat amount first reaches half of the total retreat amount is determined. The normalized half retreat time position is obtained by normalizing the half retreat time position. The local detachment crack degree is calculated based on the difference in normalized semi-retreat time sequence position between adjacent icing space sampling units; the segmented residual return degree is calculated based on the number of reversals of the main retreat time sequence position along the length of the conductor in each longitudinal sampling segment; the eccentric residual offset degree is calculated based on the dispersion of the normalized semi-retreat time sequence position in the circumferential sampling area within each longitudinal sampling segment; and the sudden detachment pulse degree is calculated based on the maximum retreat percentage of the overall icing retreat amount within each sampling interval. The local detachment fissure degree, segmented residual return degree, eccentric residual offset degree, and sudden de-icing pulse degree are fused by unweighted product to obtain the regression morphology index, and the regression morphology index is used as the regression morphology result.

3. The method for analyzing and monitoring the stress on a conductor under icing conditions according to claim 1, characterized in that, The steps for calculating the force release index as the result of the force release trajectory are as follows: According to the sampling time sequence, the tension value, sag value, vibration amplitude value and insulator string swing angle value of the target span conductor are read from the comparison segments before and after the ice recedes. The interval normalization is performed respectively to obtain the normalized tension value, normalized sag value, normalized vibration value and normalized swing angle value at each sampling time. For any sampling moment, multiply the values ​​after subtracting the normalized tension value, the normalized sag value, the normalized vibration value, and the normalized swing angle value, take the fourth root of the multiplication result, and then subtract the fourth root result to obtain the comprehensive residual force value at that sampling moment. According to the sampling time sequence, the minimum value is taken from all the comprehensive residual force values ​​from the initial sampling time to the current sampling time, and used as the comprehensive residual force envelope value at the current sampling time. The comprehensive residual force value is then subtracted from the comprehensive residual force envelope value to obtain the force rebound return amount. The rebound occupancy is obtained by performing unweighted product fusion based on the force rebound return amount at each sampling time; The overall icing retreat amount between each adjacent sampling time is read. The icing release progress is determined based on the cumulative result of the overall icing retreat amount. The force release progress is determined based on the degree of decrease of the envelope value under comprehensive force residue relative to the comprehensive force residue value at the initial sampling time. The difference between the icing release progress and the force release progress is determined as the release misalignment amount. The release misalignment amount at each sampling time is fused by unweighted product to obtain the release misalignment retention degree. The positive increment of the comprehensive residual force value between adjacent sampling times is determined as the comprehensive residual force rebound amount. The total ice retreat amount between adjacent sampling times is divided by the total total ice retreat amount to obtain the single-interval ice release ratio. The de-icing impact rebound ratio is determined according to the ratio relationship between the comprehensive residual force rebound amount and the single-interval ice release ratio. The de-icing impact rebound ratio is obtained by performing unweighted product fusion based on the de-icing impact rebound ratio of each adjacent sampling time. The rebound occupancy degree, release misalignment retention degree, and overall de-icing impact rise degree are fused by unweighted product to obtain the force release index, and the force release index is used as the force release trajectory result.

4. The method for analyzing and monitoring the stress on a conductor under icing conditions according to claim 1, characterized in that, The steps for identifying the cross-gap force transmission state based on the comparison fragments before and after fading, and calculating the force transmission closure index as the force transmission closure result are as follows: The tension, sag, vibration amplitude, and insulator string swing angle values ​​of the target span and its left and right adjacent spans at each sampling time are read, normalized, and then fused by unweighted product to obtain the comprehensive force disturbance value of each span at each sampling time. The timing and intensity of the de-icing disturbance source are determined based on the maximum change in the comprehensive force disturbance value between adjacent sampling times of the target span. For any adjacent span, the maximum change in the comprehensive force disturbance value after the ice removal disturbance source is extracted as the hysteresis response intensity, and the transmission imprint value of the adjacent span is determined according to the ratio between the hysteresis response intensity and the disturbance source intensity. For any adjacent gear, read the maximum value of the combined force disturbance after the time of the ice removal disturbance source and the value of the combined force disturbance at the last sampling time, and determine the end residual ratio based on the ratio of the two. Multiply the transfer imprint value of each adjacent span by the end residual ratio to obtain the transfer residual value of each adjacent span. Then, perform unweighted product fusion on each transfer residual value to obtain the force transfer closure index. The force transfer closure index is used as the force transfer closure result.

5. The method for analyzing and monitoring the stress on a conductor under icing conditions according to claim 1, characterized in that, The steps for calculating the de-icing rebound risk index based on the regression pattern results, force release trajectory results, and force transmission closure results are as follows: Add the fading morphology index, the force release index, and the force transmission closure index to obtain the sum of the indices; divide the sum of the indices by three to obtain the de-icing rebound risk index.

6. The method for analyzing and monitoring the stress on a conductor under icing conditions according to claim 1, characterized in that, The steps for generating the fading and recovery judgment results and determining the warning cancellation or continuation strategy based on the fading and recovery judgment results are as follows: The de-icing rebound risk index is compared with a preset risk threshold. When the de-icing rebound risk index is less than the preset risk threshold, a reliable recovery result is generated and the icing risk warning for the current target range is lifted. When the risk index of ice rebound is not less than the preset risk threshold, a risk failure result is generated, and the icing risk warning for the current target span continues, while the conductor status data of the target span and its adjacent spans are collected. During the period of continued icing risk warning, the de-icing rebound risk index is recalculated according to the preset review cycle, and the icing risk warning for the current target range is lifted when the recalculated de-icing rebound risk index is less than the preset risk threshold for a preset number of consecutive preset times. When the recalculated de-icing rebound risk index remains at or above the preset risk threshold, maintain the icing risk warning for the current target gear distance and generate an inspection trigger command for the current target gear distance.

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