Crossing line stress detection system applied to overhead line laying

Abstract

The application discloses a spanning line stress detection system applied to overhead line laying and relates to the technical field of overhead line construction management; according to line design parameters, the target conductor static stress range is determined, the field measured stress and the environment measured parameters are synchronously collected before anchoring, the instantaneous external disturbance component is stripped by means of an artificial intelligence model, the measured static stress without interference is restored, and the tight line adjustment operation is carried out in stages according to the standard that the measured static stress falls into the static stress range; the application avoids the problems of repeated judgment, over-adjustment or under-adjustment caused by the large fluctuation of the original measured stress due to random disturbance; the static stress range is calculated and generated according to the solidified line design parameters, the judgment threshold value does not need to be dynamically modified according to the environment, the problems of poor adaptability and non-uniform standard caused by the traditional multi-parameter dynamic adjustment benchmark are solved, and thus the accurate stress detection in the spanning line laying process is realized.

Description

Technical Field

[0001] This invention belongs to the field of overhead line construction management technology, specifically a stress detection system for crossing lines used in overhead line laying. Background Technology

[0002] Overhead power line crossing sections (crossing highways, railways, rivers, communication lines, etc.) are high-risk and critical sections for power grid operation, and their stress state directly determines the construction quality and long-term operational safety of the line. Throughout the entire process of raw material delivery, on-site deployment, tensioning and shaping, and commissioning, crossing lines are susceptible to factors such as initial defects in the wire, uneven tension during construction, environmental temperature changes, wind disturbance and vibration, etc., which can lead to problems such as excessive stress, uneven stress distribution, sag deviation, and local stress concentration, thereby causing safety hazards such as strand breakage, wire breakage, hardware detachment, and insufficient safety distance.

[0003] Existing solutions often directly use measured stress collected at the construction site as the basis for comparison. This measured stress is superimposed with a large number of random and instantaneous disturbances such as gusts of wind vibration, hydraulic vibration of tensioning equipment, instantaneous swaying of the conductor, and vehicle and ground vibration. Therefore, the measured stress fluctuates frequently and has extremely high dispersion. Even under the steady-state stress state of the same conductor, the measured stress can fluctuate greatly within a short period of time, easily leading to repeated judgments of compliance and non-compliance. Some solutions dynamically adjust the static stress range based on environmental parameters. Once the external disturbance changes, the static stress range needs to be adjusted by multiple parameters. This method of adjusting the static stress range by multiple parameters is difficult to ensure that the static stress range fits the actual working conditions, nor can it ensure that the static stress range is compatible with the measured stress, and still cannot ensure the reliability of stress detection for crossing lines.

[0004] This invention provides a stress detection system for overhead line crossings used in overhead line laying to solve the above-mentioned technical problems. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes a stress detection system for overhead line laying.

[0006] To achieve the above objectives, a first aspect of the present invention provides a stress detection system for overhead line crossings, comprising: Stress detection module: used to retrieve the static stress range of the target conductor determined based on the line design parameters; whereby the target conductor refers to the conductor crossing the section, and the static stress range refers to the allowable steady-state stress range of the target conductor under conditions of no external disturbance; and, This is used to correct the measured stress of the target conductor using environmental measured parameters before anchoring, thus obtaining the measured static stress; with the measured static stress being within the static stress range as the target, the target conductor is tightened; wherein, the correction of the measured stress is achieved through an artificial intelligence model.

[0007] In one possible implementation, the static stress range of the target conductor is determined based on the line design parameters, including: The stress reference value of the target conductor is calculated based on the line design parameters and the catenary mechanical model; the line design parameters are extracted from the line design scheme of the target conductor. The static stress range of the target conductor is obtained based on the stress reference value and the stress allowable error; whereby the stress allowable error is extracted from the line design parameters.

[0008] In one possible implementation, time-dependent pre-compensation is performed on the static stress range, including: Retrieve the aging compensation model; the aging compensation model includes the initial elongation sub-model, the plastic deformation sub-model, and the stress relaxation sub-model; The stress compensation value of the target conductor is calculated based on the line design parameters and the time-compensation model. The stress reference value is adjusted by adjusting the stress compensation value, thereby adjusting the static stress range.

[0009] In one possible implementation, the measured stress of the target conductor is corrected using environmentally measured parameters before anchoring, including: The measured stress of the target conductor during the tensioning stage and the corresponding measured environmental parameters are retrieved; the measured stress and environmental parameters are collected through intelligent detection equipment. The measured static stress is obtained by correcting the influence of external disturbances on the measured stress based on the measured environmental parameters; the correction of the measured stress is achieved through an artificial intelligence model.

[0010] In one possible implementation, the intelligent detection device includes a stress detection device and an environmental detection device; the stress detection device is used to intelligently acquire the measured stress of the target conductor, and the environmental detection device is used to intelligently collect the environmental measured parameters corresponding to the measured stress.

[0011] In one possible implementation, the influence of external disturbances on the measured stress is corrected based on measured environmental parameters, including: The stress correction model is retrieved; the stress correction model is based on artificial intelligence model construction and training. The measured stress and its corresponding environmental measured parameters are input into the stress correction model to obtain the measured static stress.

[0012] In one possible implementation, the target conductor is tightened, including: Determine whether the measured static stress is within the static stress range; if yes, the target conductor stress is deemed qualified and the conductor is anchored; otherwise, adjust the strategy according to the degree of stress deviation. The target conductor is adjusted according to the adjustment strategy until the measured static stress is within the static stress range; the control strategy includes tension adjustment and stabilization time.

[0013] In one possible implementation, the adjustment strategy is matched according to the degree of stress deviation, including: Calculate the stress deviation between the measured static stress and the upper or lower limit of the static stress range; Determine whether the stress deviation value is greater than the preset stress deviation limit; if yes, trigger the machine to lock and issue a fault alarm; if no, determine the degree of stress deviation based on the stress deviation value; whereby the degree of stress deviation includes slight stress deviation and severe stress deviation; Adjust the strategy according to the degree of stress deviation.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention first determines the static stress range of the target conductor based on the line design parameters. Before anchoring, it simultaneously collects on-site measured stress and environmental measured parameters. With the help of an artificial intelligence model, it removes instantaneous external disturbance components and restores the interference-free measured static stress. The tightening adjustment operation is carried out in stages based on the measured static stress falling within the static stress range. This invention avoids the problems of repeated judgments, over-adjustment or under-adjustment caused by large fluctuations in the original measured stress due to random disturbances. The static stress range is calculated and generated by the fixed line design parameters, without the need to dynamically modify the judgment threshold according to the environment. It solves the problems of poor adaptability and inconsistent standards caused by traditional multi-parameter dynamic adjustment benchmarks, thereby achieving accurate stress detection during the laying of crossing lines.

[0015] 2. Before stress determination, this invention can retrieve the stress compensation value from the aging compensation model, use the stress compensation value to correct the calculated stress benchmark value, and update the static stress range synchronously. This invention completes the pre-calibration of the static stress range in advance, which can achieve accurate determination of the measured static stress during the tensioning and stabilization stage. It can significantly reduce the rework and adjustment process after anchoring, avoid repeated tensioning of the conductor to prevent additional plastic damage, and improve the construction efficiency of power grid crossing lines. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram illustrating the working principle of the stress detection module in an embodiment of the present invention; Figure 2 This is a schematic diagram of the workflow for performing time-based pre-compensation on the static stress range in an embodiment of the present invention. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1 The first aspect of the present invention provides a stress detection system for overhead line laying, including a stress detection module, the working process of which is as follows: A01: Retrieve the static stress range of the target conductor determined based on the line design parameters; where the target conductor refers to the conductor crossing the section, and the static stress range refers to the allowable steady-state stress range of the target conductor under no external disturbance. The target conductor is selected based on the line design parameters of the crossing section, and it is required that the target conductor meet all design requirements of the crossing section. The line design parameters are technical indicators and boundary conditions determined in the early stages of the project, based on overhead line construction standards, crossing section operating conditions, and power grid operation requirements. These line design parameters are the foundational data for stress testing of the crossing line. The line design parameters include conductor material parameters, crossing section spatial structure parameters, baseline operating condition parameters, and construction and operation constraint parameters. Conductor material parameters include conductor type, material type, total conductor cross-sectional area, aluminum-to-steel cross-section ratio, and comprehensive self-weight load. Crossing section spatial structure parameters include horizontal span, vertical span, height difference between suspension points on both sides, and tower suspension point installation positions. Baseline operating condition parameters include baseline design temperature, multi-year average temperature of the crossing section, and design baseline wind speed. Construction and operation constraint parameters include design rated horizontal tension, allowable stress error, stress deviation limit, adjustment strategy, pre-tensioning process standards, voltage stabilization process standards, and stringing process standards.

[0020] It is understandable that the historical environment of the crossing section should be considered when designing the crossing line, and the various extreme situations that may occur in the crossing section should be comprehensively considered to form a line design scheme. The target conductor should be determined based on the line design parameters in the line design scheme to ensure that the target conductor can operate normally and stably under various complex working conditions when it is laid according to the line design parameters.

[0021] The static stress range refers to the steady-state stress range after eliminating instantaneous and random dynamic disturbances. The steady-state stress changes gradually, reflecting the inherent stress state of the target conductor. The static stress range is the safe variation range of steady-state stress. As long as the measured static stress of the target conductor falls within this range, it can be determined that the stress meets the design requirements, thereby eliminating potential hazards such as strand breakage, wire breakage, and insufficient safety distance.

[0022] This invention determines the static stress range of the target conductor based on the line design parameters, and uses this static stress range as the criterion for judging whether the stress of the crossing line is normal. This static stress range is not affected by external interference, so it does not need to be adjusted according to the external environment.

[0023] A02: During the tensioning stage, the measured stress of the target conductor is corrected by the measured environmental parameters to obtain the measured static stress; with the measured static stress being within the static stress range as the target, the target conductor is tensioned; the correction of the measured stress is achieved through an artificial intelligence model.

[0024] The construction of the crossing line involves several processes, including laying, pre-tensioning, tightening, and anchoring. Laying involves extending the (brand new) conductor from the reel to the laying slipway between the two towers using traction equipment. Tensioning is used throughout to prevent the conductor from dragging on the ground, bending violently, or suffering friction damage. Pre-tensioning involves applying a force higher than the operating tension to the conductor short-term after it has been fully laid, actively releasing gaps between conductor strands and initial plastic deformation, reducing sag growth caused by initial elongation after the line is put into operation. Tightening involves adjusting the conductor tension (tension and stress are interchangeable) to the design target value after pre-tensioning, followed by voltage stabilization. Anchoring involves permanently pressing and anchoring both ends of the conductor using tension clamps after the measured static stress is deemed acceptable, locking the conductor length and tension. Once anchoring is complete, no further adjustment of the conductor stress is permitted, and subsequent finishing work includes accessory installation and protective removal.

[0025] This invention proactively isolates external disturbance components such as wind vibration and equipment vibration from the stress mechanism of the crossing line, restoring the measured static stress. This measured static stress is stable without instantaneous jumps, and the judgment result is stable and reliable. It can avoid problems such as repeated judgment and over-adjustment during construction caused by frequent fluctuations in measured stress with the environment, greatly reducing the reliance on the experience judgment of operators. Moreover, the unified static stress data throughout the process is more conducive to horizontal comparison and quality traceability across cycles and sections, and is fully adapted to the high standards of construction accuracy, standardized management and control and long-term operational safety requirements of high-risk crossing sections such as railways, highways and rivers.

[0026] The process for determining the static stress range of the target conductor based on the line design parameters in this invention is as follows: B01: Calculate the stress reference value of the target conductor based on the line design parameters and the catenary mechanical model. The line design parameters are extracted from the line design scheme of the target conductor. The stress reference value refers to the axial tensile stress generated by the target conductor under ideal working conditions, without external dynamic disturbances (such as wind vibration, vibration of construction equipment, instantaneous swaying of the conductor, disturbance by personnel / vehicles, etc.), solely by the self-weight of the target conductor in a reference environment. The stress reference value is the benchmark value for judging whether the stress of the target conductor is qualified.

[0027] The specific design parameters for the line include the following: conductor material parameters, which reflect the inherent mechanical properties of the target conductor, including model material, geometric parameters, and mechanical strength parameters; spatial structure parameters of the crossing section, including span, suspension point height difference, and design sag interval; meteorological environment parameters, including reference temperature, design wind speed, and design icing thickness; and construction and operation constraint parameters, including design rated tension, allowable stress error, construction process parameters, and safety constraints for crossing.

[0028] The catenary mechanical model is a classic mechanical model for solving the morphology, tension, stress, and sag of flexible suspension cables under automatic and external loads. Crossing lines are large-span flexible cables, and the catenary mechanical model is widely used in engineering practice to calculate conductor stress.

[0029] For example, suppose the target conductor design parameters include the following: conductor material parameters: conductor cross-sectional area Overall self-weight ratio Spatial structural parameters of the span: horizontal span Suspension points are at the same height, with a height difference. Baseline construction parameters: Only self-weight static load is considered, with no wind dynamic load; Construction constraint parameters: Design horizontal tension (horizontal tension at the lowest point of the target traverse line). ; Based on the simplified catenary mechanical model, the formula for calculating the total axial tension at any cross-section of the target conductor is as follows: In the formula This is the arc length of the conductor from the cross-section to the lowest point of the target conductor. For rapid calculation of the total tension at the midpoint of the span, a simplified parabolic model is used in engineering calculations, with the total self-weight of half a span of conductor as the vertical load component, i.e., utilizing the vertical resultant force of the total self-weight of half a span of conductor. replace That is, through the formula The total axial tension at the midpoint of the span was calculated. According to the tension and stress conversion formula The static stress at the midpoint of the span was calculated. , That is, it serves as a stress reference value, which only considers the self-weight of the target conductor.

[0030] B02: The static stress range of the target conductor is obtained based on the stress reference value and the stress allowable error; whereby the stress allowable error is extracted from the line design parameters.

[0031] After calculating the reference stress value of the target conductor based on the catenary mechanical model, the allowable stress error is extracted from the line design parameters. The static stress range is obtained by expanding the reference stress value using the allowable stress error. It should be noted that the allowable stress error is set in conjunction with construction allowable errors, temperature fluctuations, etc.

[0032] For example, if the allowable stress error is set according to the circuit design parameters, The stress reference value is The range of static stress is [ ],and and The units are consistent, defaulting to MPa. In this example, the stress reference value... Take 40MPa, and the allowable stress error is 2MPa.

[0033] This invention employs a catenary mechanical model adapted to overhead flexible conductors, and combines line design parameters to solve for stress benchmark values. This ensures that the obtained stress benchmark values ​​closely match the ideal, undisturbed, steady-state stress state of the target conductor. Moreover, the stress benchmark values ​​are calculated entirely from the previously fixed line design parameters, eliminating the subjective assignment step and removing the problem of inconsistent standards caused by manually set thresholds from the source.

[0034] During the entire construction process of the catenary, including deployment, pre-tensioning, tightening, and anchoring, issues such as plastic deformation, initial elongation, and stress relaxation caused by material properties can lead to deviations in the stress reference values ​​calculated based on the catenary mechanical model. This results in a shift in the static stress range, so it is necessary to perform time-dependent pre-compensation on the static stress range to ensure that the static stress range conforms to the actual working conditions.

[0035] Please see Figure 2 Before determining whether the measured static stress meets the requirements, this invention can also perform time-based pre-compensation on the static stress range. The implementation process is as follows: C01: Retrieve the aging compensation model; the aging compensation model includes the initial elongation sub-model, the plastic deformation sub-model, and the stress relaxation sub-model; In the aging compensation model, the initial elongation sub-model, the plastic deformation sub-model, and the stress relaxation sub-model calculate the stress compensation value of each component separately. The total stress compensation value is obtained by coupling the stress compensation values ​​of each component.

[0036] The (brand new) conductor has gaps between its strands. Under constant tension, the strands fit tightly together and elongate slowly as a whole, which is an inherent long-term creep characteristic of the cable. Without compensation, after the tensioning is completed, the sag of the line will continue to increase and the steady-state stress will continue to decrease after a period of operation, resulting in insufficient safety distance to the ground at the crossing section. The initial elongation sub-model is used to calculate the stress attenuation caused by the slow permanent elongation (initial elongation / creep) of the (brand new) conductor under long-term continuous tension, and it outputs the stress compensation value of the initial elongation component. The component compensation based on the initial elongation sub-model can solve the long-term deformation problem of the crossing line, thereby adapting to the stringent requirements of long-term stability of sag and stress at the crossing section. The initial elongation sub-model is constructed based on the national standard equivalent cooling method and creep constitutive model.

[0037] During the deployment of the (new) conductor, friction with the ground and pulleys, repeated bending, and unconventional tensile loading during the pre-tensioning stage will cause permanent tension exceeding the elastic limit in the aluminum strands and steel core inside the conductor, making it impossible to return to its original length after unloading. This permanent tension directly reduces the steady-state tension of the conductor, resulting in an overestimation of the stress baseline value calculated by the catenary mechanics theory. The plastic deformation sub-model is used to calculate the stress loss corresponding to the irreversible permanent plastic deformation generated during the deployment, dragging, bending, and pre-tensioning of the (new) conductor. It outputs the stress compensation value of the plastic deformation component. The plastic deformation sub-model can be constructed based on the elastoplastic kinematic stiffening constitutive model.

[0038] (New) After the conductor is tensioned to the target tension, the conductor length remains constant. The internal metal molecules slowly slip, and the tensile force gradually decreases over the same length, i.e., stress relaxation. The relaxation rate is fastest during the pressure stabilization stage of construction, which is the main source of stress shift before tensioning and anchoring. The stress relaxation sub-model is used to calculate the amount of stress relaxation as the stress spontaneously decays over time during the constant tension stabilization stage of the conductor with fixed length. It outputs the stress compensation value for the stress relaxation component. The stress relaxation sub-model is based on Maxwell's viscoelastic constitutive model.

[0039] In some other preferred embodiments, the models based on each risk sub-model can also be constructed based on artificial intelligence models. For example, the initial elongation sub-model, plastic deformation sub-model, and stress relaxation sub-model can all be constructed using deep convolutional neural network models. After training with a training sample set, they are integrated into a time-effect compensation model. The training sample set can be obtained through laboratory simulation.

[0040] C02: Calculate the stress compensation value of the target conductor based on the line design parameters and the time-compensation model, adjust the stress reference value through the stress compensation value, and then adjust the static stress range.

[0041] The aging compensation model provides a unified input interface to receive line design parameters and stress reference values. It extracts sub-item input features from these parameters according to the input data requirements of each sub-model. Each sub-model outputs the corresponding sub-item stress compensation value based on its input features. These sub-item stress compensation values ​​are coupled using a set summation module to obtain the final stress compensation value. The sub-item input features of the initial elongation sub-model include the aluminum-to-steel cross-section ratio, average annual temperature of the crossing section, and stress reference values. The sub-item input features of the plastic deformation sub-model include the deployment drag distance, number of bends, pre-tension force value, and pre-tension duration. The deployment drag distance and number of bends can be extracted from the construction log. The sub-item input features of the stress relaxation sub-model include the constant tension during the stabilization stage and the stabilization duration. The training sample set for the aging compensation model is obtained through laboratory calibration experiments or through on-site construction measurement data; the specific training process will not be detailed here.

[0042] It should be noted that the stretching and dragging distance and the number of bends can be recorded in real time from the on-site tensioning construction log and simultaneously collected and uploaded by the tensioning equipment control system. The pre-tensioning force value and pre-tensioning duration can be extracted from the construction operation constraint parameters. The constant tension and stabilization duration during the pressure stabilization stage can be collected in real time by the on-site tensioning hydraulic tools and simultaneously uploaded to the stress detection module.

[0043] During the tensioning and stabilization phase of the target conductor, aging pre-compensation is performed on the stress reference value and its corresponding static stress range to eliminate the influence of material failure characteristics such as plastic deformation, initial elongation, and stress relaxation during the deployment, pre-tensioning, and tensioning processes on the static stress range. The compensated static stress range is then used to determine whether the stress of the target conductor during the tensioning and stabilization phase before anchoring meets the design requirements, providing a data basis for the tensioning operation of the target conductor.

[0044] For example, assume the static stress range is [ The line design parameters are input into the aging compensation model. The initial elongation sub-model, plastic deformation sub-model, and stress relaxation sub-model in the aging compensation model respectively obtain the partial stress compensation values. , and The stress compensation value output by the aging compensation model is the coupling value of each component stress compensation value, i.e. , The value can be positive or negative depending on the direction of compensation; this stress compensation value is used to adjust the static stress range, and the adjusted static stress range is [ ].

[0045] This invention establishes an aging compensation model comprising three independent sub-models: initial elongation, plastic deformation, and stress relaxation. It quantifies the stress compensation values ​​corresponding to various aging deformations during the construction process of the target conductor and couples them to obtain the target conductor's stress compensation value. This allows for pre-compensation of the stress benchmark value and static stress range, simultaneously addressing stress benchmark offset issues caused by three types of deformation: irreversible plastic deformation during pre-tensioning, short-term stress relaxation during the tensioning and stabilization phase, and long-term creep elongation of the new conductor. It balances construction quality with long-term sag and stress stability, adapting to stringent safety standards in high-risk crossing sections. The invention's sub-modeling approach distinguishes different deformation mechanisms, avoids error coupling, and achieves higher compensation calculation accuracy. Furthermore, it relies on automatic calculations based on line, conductor, and construction process parameters throughout the process, eliminating inconsistent standards caused by manual experience estimation and achieving digital standardization of the compensation process. Simultaneously, this step completes threshold pre-calibration before on-site stress detection and judgment, significantly reducing rework and line adjustment after anchoring, shortening the construction time in high-risk sections, and avoiding additional damage caused by repeated conductor tensioning.

[0046] The implementation process of correcting the measured stress of the target conductor using environmental measured parameters in this invention is as follows: D01: Retrieve the measured stress of the target conductor during the tightening stage and the corresponding measured environmental parameters; the measured stress and environmental parameters are collected through intelligent detection equipment; The laying process for the target conductor in the crossing section includes deployment, pre-tensioning, tightening, and anchoring. The measured stress is the original axial tensile stress of the target conductor collected by intelligent detection equipment deployed at the construction site during the tightening (voltage stabilization) stage and before anchoring. The measured stress did not eliminate external dynamic interference and mainly included the following three types of fluctuations: stress jumps caused by instantaneous gusts and continuous wind vibration; hydraulic vibration of the tightening equipment and vibration disturbance of the traction equipment; and short-term stress fluctuations caused by small swaying of the target conductor and slight slippage of the fittings.

[0047] Environmental parameters include temperature, wind speed, icing, and vibration. After collecting the measured stress and environmental parameters of the target conductor, the measured stress and environmental parameters are spatiotemporally aligned to improve the reliability of the correction results.

[0048] D02: The measured static stress is obtained by correcting the influence of external disturbances on the measured stress based on the measured environmental parameters; the correction of the measured stress is achieved through an artificial intelligence model.

[0049] When correcting the measured stress, the environmental measured parameters during the laying of the target conductor are retrieved. The stress correction value is calculated using the environmental measured parameters and the stress correction model. This stress correction value is then used to correct the measured stress, resulting in the measured static stress. The stress correction model is built based on an artificial intelligence model, which establishes a mapping relationship between the measured stress and the measured static stress under the influence of environmental measured parameters.

[0050] This invention simultaneously collects environmental measured parameters during the tensioning and stabilization stage, and automatically calculates stress correction values ​​through a stress correction model constructed by artificial intelligence. It eliminates various instantaneous random interferences such as wind vibration, equipment shaking, and conductor swaying, and then outputs the measured static stress. Compared with the traditional method of directly using measured stress for judgment, this invention can completely avoid the problems of repeated judgments, over-adjustment or under-adjustment during construction caused by frequent data fluctuations.

[0051] The intelligent detection device in this invention includes a stress detection device and an environmental detection device; the stress detection device is used to intelligently acquire the measured stress of the target conductor, and the environmental detection device is used to intelligently collect the environmental measured parameters corresponding to the measured stress.

[0052] Actual stress can be intelligently acquired through stress detection equipment, such as S-type tension sensors / fiber optic grating (FBG) tension sensors. The stress detection equipment is installed at tension points, wire-laying pulleys, the traction end of the tensioning equipment, and the hardware connections at both ends of the crossing section to collect the total axial tension of the target conductor in real time. The ratio of the total axial tension to the cross-sectional area of ​​the target conductor is taken as the actual stress.

[0053] For example, one S-type tension sensor / FBG tension sensor is installed at each tension point on both sides of the span to simultaneously collect the axial tension of the conductor at the left and right tension points. , With a height difference of 0, the conductors are symmetrically arranged, and the tension values ​​at the hanging points on both sides are approximately equal, denoted as... Referring to the assumed parameters in the previous example, using the formula... The total axial tension at the midpoint of the span is calculated, and the measured stress is obtained by dividing it by the cross-sectional area of ​​the target conductor.

[0054] Environmental parameters measured include conductor surface temperature, ambient temperature, wind parameters (such as wind speed and direction), icing parameters (such as equivalent icing thickness on the target conductor), and vibration parameters (such as equipment shaking or vibration). These environmental parameters are intelligently collected using environmental monitoring equipment, such as integrated six-element micro-meteorological instruments, infrared thermometers, icing sensors, and vibration sensors. Environmental parameters are collected synchronously with measured stress to ensure their spatiotemporal consistency.

[0055] The implementation process of correcting the influence of external disturbances on measured stress based on measured environmental parameters in this invention is as follows: E01: Retrieve the stress correction model; where the stress correction model is based on the construction and training of an artificial intelligence model; The stress correction model is built and trained based on an artificial intelligence model, such as a BP neural network model or an RBF neural network model. The artificial intelligence model is trained using a pre-built training sample set, and after training is complete, the artificial intelligence model is stored as the stress correction model for later use.

[0056] Taking a backpropagation (BP) neural network model as an example, a three-layer network structure is set up, consisting of an input layer, hidden layers, and an output layer. The number of neurons in the input layer matches the dimension of the input data. The hidden layers have multiple neurons to fit complex nonlinear fitting relationships, and the output layer has one neuron, outputting the corrected measured static stress. Gradient descent and the Adam optimizer are used for iterative weight updates during training and updating.

[0057] The training sample set includes several training samples. Each training sample includes measured stress, measured environmental parameters, and the corresponding measured static stress. The measured static stress refers to the true steady-state stress corresponding to the measured stress and measured environmental parameters in the same sample data. Sample data can be obtained through laboratory simulation or extracted from historical construction data. All training samples are normalized and cleaned of outliers before being divided into training, validation, and test sets. The BP neural network model is trained using the training, validation, and test sets.

[0058] E02: Input the measured stress and its corresponding environmental measured parameters into the stress correction model to obtain the measured static stress.

[0059] For example, assume the measured stress is The measured stress and corresponding environmental measured parameters are input into the stress correction model. The measured environmental parameters corresponding to the measured stress are input into the stress correction model to obtain the stress correction value. , The correction value can be positive or negative depending on the direction; then the stress correction value is used. Correction of measured stress Obtain the measured static stress That is, the stress correction model ultimately outputs the measured static stress. .

[0060] In some other preferred embodiments, the measured stress can be the average stress calculated from continuous measurement data. Specifically, all original measured stress samples within a continuous stable time window during the voltage stabilization phase can be extracted, and the average stress within the window can be calculated using an arithmetic mean algorithm. This average value is then used as the measured stress corresponding to this time segment for subsequent correction calculations. The duration of the continuous measurement data acquisition window can be adaptively configured according to the risk level of the crossing section. For high-risk crossing sections such as railways and main roads, a longer sampling average window is set to weaken random pulse disturbances; for ordinary highways and river crossing sections, the average window duration can be appropriately shortened to take into account the detection response speed. Using the continuous sampling average as the measured stress can pre-filter out irregular instantaneous stress spikes, reduce the fitting calculation load of the subsequent artificial intelligence stress correction model, reduce the interference of extreme abrupt abnormal samples on the accuracy of the mapping relationship solution, and further improve the stability and reliability of the subsequent measured static stress output results.

[0061] The implementation process for tightening the target conductor in this invention is as follows: F01: Determine whether the measured static stress is within the static stress range; if yes, the target conductor stress is deemed qualified and the wire is anchored; if no, adjust the strategy according to the degree of stress deviation. The measured static stress refers to the steady-state stress of the target conductor under the current operating conditions. If the measured static stress is within the static stress range, it indicates that the laying of the target conductor has met the design requirements of the crossing section, and the conductor can be directly anchored to complete the laying of the target conductor for that crossing section. However, if the measured static stress is not within the static stress range, it indicates that the laying of the target conductor has not yet met the design requirements of the crossing section. In this case, the target conductor should be tightened and adjusted until the adjusted measured static stress is within the static stress range.

[0062] F02: Adjust the target conductor according to the adjustment strategy until the measured static stress is within the static stress range; the control strategy includes tension adjustment item and voltage stabilization time.

[0063] If the measured static stress is not within the static stress range, the degree of stress deviation is determined based on the deviation between the measured static stress and the boundary of the static stress range. An adjustment strategy is matched according to the degree of stress deviation, and the target conductor is adjusted based on the adjustment strategy. After each adjustment, the measured static stress is reacquired until the measured static stress is within the static stress range.

[0064] The control strategy is preset and associated with the degree of tension deviation. It includes tension adjustment and stabilization time. The more severe the stress deviation, the larger the tension adjustment and the longer the stabilization time.

[0065] In this invention, if the measured static stress is within the static stress range, the current state of the target conductor meets the design requirements; otherwise, the deviation of the measured static stress from the static stress range is extracted first, and the adjustment strategy of the target conductor is determined according to the degree of deviation. The adjustment of the target conductor is completed according to the adjustment strategy until the measured static stress of the adjusted target conductor is within the static stress range.

[0066] The implementation process of the stress deviation matching adjustment strategy of this invention is as follows: G01: Calculate the stress deviation between the measured static stress and the upper or lower limit of the static stress range; When the measured static stress is not within the static stress range, the measured static stress is either lower than the lower limit of the static stress range or higher than its upper limit. If it is lower than the lower limit, the absolute value of the difference between the measured static stress and the lower limit of the static stress range is the stress deviation value; if it is higher than the upper limit, the absolute value of the difference between the measured static stress and the upper limit of the static stress range is the stress deviation value.

[0067] G02: Determine whether the stress deviation value is greater than the preset stress deviation limit; if yes, trigger the machine to lock and issue a fault alarm; if no, determine the degree of stress deviation based on the stress deviation value; whereby the degree of stress deviation includes slight stress deviation and severe stress deviation; When the stress deviation exceeds the preset stress deviation limit, the tensioning equipment is locked and a fault alarm is triggered simultaneously. This is primarily to prevent over-tensioning and overload of the conductor, eliminating the risk of wire breakage or strand breakage. This situation indicates that the steady-state stress of the target conductor deviates significantly from the static stress range. Continuing automatic adjustment could easily lead to over-tensioning, strand breakage, or wire breakage, causing a major safety accident in the crossing section. Furthermore, such large deviations are often caused by underlying anomalies such as sensor malfunctions, parameter input errors, or equipment jamming, which cannot be repaired by tiered adjustment strategies. Therefore, the system immediately locks the tensioning equipment, prohibiting further tensioning or loosening operations, and simultaneously outputs a fault alarm to remind staff to manually troubleshoot the fault. This avoids repeated large-scale tensioning of the conductor, preventing additional plastic damage, and meets the engineering requirements for safety management and abnormal data traceability in high-risk crossing construction.

[0068] G03: Adjust the strategy according to the degree of stress deviation.

[0069] For example, assume the static stress range is [ The stress deviation limit is [value missing]. MPa; measured static stress is When the measured static stress Within the static stress range If the measured static stress is within the specified range, it is determined that the measured static stress meets the requirements, and the anchor can be directly hung. If the measured static stress... Less than , and | -( If the measured static stress does not meet the requirements, and the stress deviation is considered a minor deviation, the matching control strategy is to adjust the tension by 0.3 MPa per adjustment, followed by a 10-minute stabilization period. After each stabilization, the measured static stress is re-acquired and re-evaluated to determine if it meets the requirements. Less than ,and | -( If the measured static stress does not meet the requirements, and the stress deviation is considered a severe deviation, the matching adjustment strategy is to adjust the tensile force by 0.8 MPa per adjustment, followed by a stabilization period of 20 minutes. After each stabilization, the measured static stress is re-acquired and reassessed to determine if it meets the requirements. In this example, the stress deviation limit is... 2MPa is acceptable.

[0070] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments.

[0071] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any other combination thereof. When implemented using a software program, it can be implemented entirely or partially in the form of a computer program product. This computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device containing one or more servers, data centers, etc., that can be integrated with the medium. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state disks (SSDs)).

[0072] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A stress detection system for crossing lines used in overhead power line laying, characterized in that, include: Stress detection module: used to retrieve the static stress range of the target conductor determined based on the line design parameters; whereby the target conductor refers to the conductor crossing the section, and the static stress range refers to the allowable steady-state stress range of the target conductor under conditions of no external disturbance; and, This is used to correct the measured stress of the target conductor using environmental measured parameters before anchoring, thus obtaining the measured static stress; with the measured static stress within the static stress range as the target, the target conductor is tightened; the correction of the measured stress is achieved through an artificial intelligence model.

2. The stress detection system for crossing lines applied to overhead line laying according to claim 1, characterized in that, The static stress range of the target conductor is determined based on the line design parameters, including: The stress reference value of the target conductor is calculated based on the line design parameters and the catenary mechanical model; the line design parameters are extracted from the line design scheme of the target conductor. The static stress range of the target conductor is obtained based on the stress reference value and the stress allowable error; whereby the stress allowable error is extracted from the line design parameters.

3. The stress detection system for overhead line crossings as described in claim 1 or 2, characterized in that, Time-dependent pre-compensation for static stress range includes: Retrieve the aging compensation model; the aging compensation model includes the initial elongation sub-model, the plastic deformation sub-model, and the stress relaxation sub-model; The stress compensation value of the target conductor is calculated based on the line design parameters and the time-compensation model. The stress reference value is adjusted by adjusting the stress compensation value, thereby adjusting the static stress range.

4. The stress detection system for overhead line crossings as described in claim 1, characterized in that, Before anchoring, the measured stress of the target conductor is corrected using environmental measured parameters, including: The measured stress of the target conductor during the tensioning stage and the corresponding measured environmental parameters are retrieved; the measured stress and environmental parameters are collected through intelligent detection equipment. The measured static stress is obtained by correcting the influence of external disturbances on the measured stress based on the measured environmental parameters; the correction of the measured stress is achieved through an artificial intelligence model.

5. The stress detection system for overhead line crossings as described in claim 4, characterized in that, Intelligent testing equipment includes stress testing equipment and environmental testing equipment; stress testing equipment is used to intelligently acquire the measured stress of the target conductor, and environmental testing equipment is used to intelligently collect the environmental measured parameters corresponding to the measured stress.

6. The stress detection system for overhead line crossings as described in claim 4, characterized in that, Corrections for the influence of external disturbances on measured stress based on measured environmental parameters include: The stress correction model is retrieved; the stress correction model is based on artificial intelligence model construction and training. The measured stress and its corresponding environmental measured parameters are input into the stress correction model to obtain the measured static stress.

7. The stress detection system for overhead line crossings as described in claim 1, characterized in that, Tightening the target conductor includes: Determine whether the measured static stress is within the static stress range; if yes, the target conductor stress is deemed qualified and the conductor is anchored; otherwise, adjust the strategy according to the degree of stress deviation. The target conductor is adjusted according to the adjustment strategy until the measured static stress is within the static stress range; the control strategy includes tension adjustment and voltage stabilization time.

8. The stress detection system for overhead line crossings as described in claim 7, characterized in that, Adjustment strategies are matched based on the degree of stress deviation, including: Calculate the stress deviation between the measured static stress and the upper or lower limit of the static stress range; Determine whether the stress deviation value is greater than the preset stress deviation limit; if yes, trigger the machine to lock and issue a fault alarm; if no, determine the degree of stress deviation based on the stress deviation value; whereby the degree of stress deviation includes slight stress deviation and severe stress deviation; Adjust the strategy according to the degree of stress deviation.

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