Anti-electric shock safe grounding method and device for maintenance operation of weathering resistant steel tower

Abstract

The invention belongs to the technical field of maintenance power utilization safety, and discloses an anti-electric shock safe grounding method and device for maintenance operation of a weathering resistant steel tower. The method comprises the steps of determining suspension potential distribution of a power failure wire during single-circuit power failure through a weathering resistant steel tower electric field analysis model built based on a finite element simulation platform; the influence of different grounding wire numbers, connection positions and suspension potential changes corresponding to the determined different operation positions on the induced voltage is compared through simulation, the influence rule of dense rust layers formed on the surface and the lap joint face of the weather-resistant steel tower material on tower body resistance is analyzed, and a first analysis result is obtained; building a maintenance operation equivalent circuit model, and performing simulation analysis on the current bypass capability of the copper grounding wire and the shielding clothes by using the transient current to obtain a second analysis result; and determining a target grounding scheme according to the first analysis result and the second analysis result. Through the mode, the induced voltage of the maintenance personnel in the tower climbing operation and maintenance process is reduced, and the personal safety of the maintenance personnel is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of safety of electricity for maintenance, and in particular to a method and device for preventing electric shock during maintenance of a weathering steel tower. Background Art

[0002] During overhead line maintenance operations, after a power outage, a ground wire must be installed to prevent the risk of electric shock to personnel due to the potential for power transmission at either end of the line. This also prevents transient electric shock to tower climbers from induced currents on the outage conductors. Weathering steel towers have a dense layer of rust on their surface, with a resistance of hundreds of megohms and weak conductivity, rendering the towers poor conductors. Current conventional grounding methods are unable to establish a safe grounding loop and conduct the induced charge on the conductors to the earth. When maintenance personnel enter an outage conductor on a weathering steel tower, the conductor cannot be effectively grounded, making them susceptible to electric shock, posing a significant safety risk.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of the present invention is to provide a method and device for preventing electric shock during maintenance work on weathering steel towers, aiming to solve the technical problem that conventional grounding methods make maintenance workers prone to electric shock and pose a great safety risk.

[0005] To achieve the above object, the present invention provides a method for preventing electric shock during maintenance work of a weathering steel tower. The method comprises the following steps:

[0006] Building an electric field analysis model for a weathering steel tower based on a finite element simulation platform. The electric field analysis model includes the weathering steel tower body, maintenance personnel, live wires, and a rust layer on the tower surface.

[0007] Determine the suspension potential distribution of the outage conductor during a single power outage using the Poisson equation and the Laplace equation based on the parameters involved in the weathering steel tower electric field analysis model;

[0008] The first analysis result is obtained by comparing the influence of different numbers of grounding wires, connection positions and the change of floating potential corresponding to the different working positions determined on the induced voltage by simulation, and analyzing the influence of the dense rust layer formed on the surface and overlap surface of the weathering steel tower material on the tower body resistance.

[0009] Building an equivalent circuit model of the maintenance operation, and using the transient current to simulate and analyze the current bypass capability of the copper grounding wire and the shielding suit, to obtain a second analysis result;

[0010] The grounding connection method between the weathering steel tower and the power-off conductor is optimized based on the first analysis result and the second analysis result, and the combination scheme with the largest reduction in induced voltage is used as the target grounding scheme.

[0011] In some embodiments, the building of an electric field analysis model for a weathering steel tower based on a finite element simulation platform includes:

[0012] Use Solidworks to model the main body of the weathering steel tower in proportion;

[0013] The live conductor is set to be a steel core aluminum stranded wire, the loaded power frequency voltage is 110kV peak, the grounding wire is at a preset distance from the tower, and the live conductor is modeled as a cylinder;

[0014] Model the maintenance personnel according to the preset height, where the head of the maintenance personnel model is a sphere and the limbs are cylinders;

[0015] The relative dielectric constant of the rust layer, the dielectric constant of the tower material, and the dielectric constant of the insulator are set according to the preset parameters;

[0016] The main body of the modeled weathering steel tower and the area corresponding to the maintenance personnel are divided into triangular grids according to the smallest unit.

[0017] In some embodiments, the method further comprises:

[0018] Use a megohmmeter to measure the resistance of the rust layer on the tower surface, where the test voltage is the preset voltage;

[0019] Select test points at different heights of the tower, repeat the measurement for a preset number of times at each point and take the average value, and then correct the resistance value in combination with the ambient temperature and humidity data;

[0020] The influence of the rust layer on the potential distribution of the tower based on the resistance value and the set dielectric constant is simulated by a finite element model to verify the correlation between the rust layer resistance and the electric field distortion;

[0021] Based on the verification results, the step of spraying rust layer conductivity enhancer is performed in the grounding plan.

[0022] In some embodiments, the building of an equivalent circuit model for the maintenance operation and the use of the transient current to simulate and analyze the current bypass capability of the copper grounding wire and the shielding suit include:

[0023] Use ATP-EMTP to build an equivalent circuit model for maintenance operations;

[0024] Simulate the transient process at the moment the grounding switch is closed to obtain the peak current and waveform of the copper grounding wire;

[0025] Analyze the attenuation effect of shielding clothing impedance on leakage current;

[0026] Verify the protective effectiveness of insulating gloves during transient processes.

[0027] In some embodiments, optimizing the grounding connection method between the weathering steel tower and the power outage conductor based on the first analysis result and the second analysis result includes:

[0028] Determine the electric field distribution when the ground wire is connected to the top, middle, and bottom of the tower according to the first analysis result;

[0029] determining a tower climbing path for maintenance personnel based on the electric field distribution;

[0030] Determine the induced voltage values of the grounding schemes corresponding to a single grounding wire, two grounding wires, and three grounding wires according to the second analysis result;

[0031] The grounding position and the number of grounding wires are adjusted based on the induced voltage value.

[0032] In some embodiments, the method further comprises:

[0033] The electric field intensity data on the body surface is monitored in real time through the electric field intensity sensor installed in the maintenance personnel's helmet;

[0034] The monitored body surface electric field intensity data is sent to a ground control terminal via a Bluetooth module to generate an electric field distribution map;

[0035] Detecting whether the surface electric field intensity at the location of the maintenance personnel exceeds a preset intensity threshold based on the electric field distribution map;

[0036] If the intensity exceeds the preset threshold, an audible and visual alarm will be triggered and the maintenance personnel will be prompted to adjust the tower climbing path.

[0037] In addition, to achieve the above-mentioned purpose, the present invention also proposes a weathering steel tower maintenance operation anti-electric shock safety grounding device, the weathering steel tower maintenance operation anti-electric shock safety grounding device comprising:

[0038] A construction module is used to build an electric field analysis model of a weathering steel tower based on a finite element simulation platform. The electric field analysis model of the weathering steel tower includes a weathering steel tower body, maintenance personnel, live wires, and a rust layer on the tower surface.

[0039] A processing module, configured to determine the suspension potential distribution of the outage conductor during a single power outage by using the Poisson equation and the Laplace equation based on the parameters involved in the electric field analysis model of the weathering steel tower;

[0040] An analysis module is configured to compare, by simulation, the effects of different numbers of grounding wires, connection positions, and changes in the floating potential corresponding to the different determined operating positions on the induced voltage, and to analyze the influence of the dense rust layer formed on the surface and overlapped surface of the weathering steel tower material on the tower body resistance, thereby obtaining a first analysis result;

[0041] The analysis module is used to build an equivalent circuit model of the maintenance operation, and use the transient current to simulate and analyze the current bypass capacity of the copper grounding wire and the shielding suit to obtain a second analysis result;

[0042] The optimization module is used to optimize the grounding connection method between the weathering steel tower and the power-off conductor according to the first analysis result and the second analysis result, and to take the combination scheme with the largest reduction in induced voltage as the target grounding scheme.

[0043] In some embodiments, the construction module is used to perform proportional modeling of the main body of the weathering steel tower using Solidworks;

[0044] The live conductor is set to be a steel core aluminum stranded wire, the loaded power frequency voltage is 110kV peak, the grounding wire is at a preset distance from the tower, and the live conductor is modeled as a cylinder;

[0045] Model the maintenance personnel according to the preset height, where the head of the maintenance personnel model is a sphere and the limbs are cylinders;

[0046] The relative dielectric constant of the rust layer, the dielectric constant of the tower material, and the dielectric constant of the insulator are set according to the preset parameters;

[0047] The main body of the modeled weathering steel tower and the area corresponding to the maintenance personnel are divided into triangular grids according to the smallest unit.

[0048] In some embodiments, the optimization module is used to measure the resistance of the rust layer on the tower surface using a megohmmeter, wherein the test voltage is a preset voltage;

[0049] Select test points at different heights of the tower, repeat the measurement 5 times at each point to obtain the average value, and then correct the resistance value based on the ambient temperature and humidity data;

[0050] The influence of the rust layer on the tower potential distribution based on the resistance value and dielectric constant is simulated by a finite element model to verify the correlation between the rust layer resistance and the electric field distortion;

[0051] Based on the verification results, the step of spraying rust layer conductivity enhancer is performed in the grounding plan.

[0052] In some embodiments, the analysis module is used to build an equivalent circuit model of the maintenance operation using ATP-EMTP;

[0053] Simulate the transient process at the moment the grounding switch is closed to obtain the peak current and waveform of the copper grounding wire;

[0054] Analyze the attenuation effect of shielding clothing impedance on leakage current;

[0055] Verify the protective effectiveness of insulating gloves during transient processes.

[0056] In the present invention, an electric field analysis model of a weathering steel tower is constructed based on a finite element simulation platform; the floating potential distribution of the outage conductor during a single power outage is determined by the Poisson equation and the Laplace equation based on the parameters involved in the electric field analysis model of the weathering steel tower; the influence of different numbers of grounding wires, connection positions and the corresponding floating potential changes of different operating positions determined on the induced voltage is compared by simulation, and the influence of the dense rust layer formed on the surface and overlap surface of the weathering steel tower material on the tower body resistance is analyzed to obtain a first analysis result; an equivalent circuit model of the maintenance operation is constructed, and the transient current is used to simulate and analyze the current bypass capacity of the copper grounding wire and the shielding suit to obtain a second analysis result; the grounding connection method of the weathering steel tower and the outage conductor is optimized according to the first analysis result and the second analysis result, and the combination scheme with the largest reduction in induced voltage is used as the target grounding scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 This is a flow chart of a first embodiment of a method for preventing electric shock and providing safe grounding for weathering steel tower maintenance work according to the present invention;

[0058] Figure 2 This is a schematic diagram of the size parameters of a 110kV corner tower in the anti-electric shock safety grounding method for weathering steel tower maintenance work of the present invention;

[0059] Figure 3 This is a schematic diagram of a 3D model of a worker in the anti-electric shock safety grounding method for weathering steel tower maintenance work of the present invention;

[0060] Figure 4 This is an equivalent circuit diagram of the grounding process in the method for preventing electric shock during maintenance work of a weathering steel tower according to the present invention;

[0061] Figure 5 This is a position distribution diagram of the anti-electric shock safety grounding method for weathering steel tower maintenance work of the present invention;

[0062] FIG6( a ) is a diagram showing the electric field distribution on the human body surface at position 2 in the method for preventing electric shock during maintenance work on a weathering steel tower according to the present invention;

[0063] FIG6( b ) is a diagram showing the electric field distribution on the human body surface at position 3 in the method for preventing electric shock during maintenance work on a weathering steel tower according to the present invention;

[0064] FIG6( c ) is a diagram showing the electric field distribution on the human body surface at position 4 in the method for preventing electric shock during maintenance work on a weathering steel tower according to the present invention;

[0065] Figure 7 This is a curve showing the maximum surface field strength value variation of the human body in the anti-electric shock safety grounding method for weathering steel tower maintenance work of the present invention;

[0066] Figure 8 This is a structural block diagram of the first embodiment of the weathering steel tower maintenance operation anti-electric shock safety grounding device of the present invention.

[0067] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0068] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0069] The embodiment of the present invention provides a method for preventing electric shock safety grounding during maintenance of weathering steel towers. Figure 1 , Figure 1 This is a flow chart of a first embodiment of a method for safe grounding to prevent electric shock during maintenance work on a weathering steel tower according to the present invention.

[0070] In this embodiment, the anti-electric shock safety grounding method for weathering steel tower maintenance work includes the following steps:

[0071] Step S10: Building an electric field analysis model of a weathering steel tower based on a finite element simulation platform.

[0072] In this embodiment, the executor of this embodiment is a weathering steel pole tower maintenance operation anti-electric shock safety grounding device, wherein the weathering steel pole tower maintenance operation anti-electric shock safety grounding device has functions such as data processing, data communication and program running. The weathering steel pole tower maintenance operation anti-electric shock safety grounding device can be a computer terminal device or other network device, and of course it can also be other devices with similar functions, and this embodiment does not limit this.

[0073] It should be noted that during overhead line power outage maintenance operations, after the line is powered off, a ground wire must be installed on the outage line to avoid the risk of electric shock to personnel due to the possibility of power being supplied at any time at both ends of the line. This also prevents transient electric shock to personnel climbing the tower from induced electricity on the outage conductor. A dense layer of rust exists on the surface of the weathering steel tower. This rust layer has a resistance of hundreds of megohms and weak conductivity, rendering the tower a poor conductor. Current conventional grounding methods are unable to establish a safe grounding loop and conduct the induced charge on the conductor to the earth. When maintenance personnel enter the outage conductor on the weathering steel tower line, the conductor cannot be effectively grounded, making them prone to electric shock, posing a significant safety risk.

[0074] In this embodiment, an electric field analysis model of a weathering steel tower is constructed based on a finite element simulation platform; the floating potential distribution of the outage conductor during a single power outage is determined by using the Poisson equation and the Laplace equation based on the parameters involved in the electric field analysis model of the weathering steel tower; the influence of different numbers of grounding wires, connection positions and the corresponding floating potential changes of different operating positions determined on the induced voltage is compared by simulation, and the influence of the dense rust layer formed on the surface and overlap surface of the weathering steel tower material on the tower body resistance is analyzed to obtain a first analysis result; an equivalent circuit model of the maintenance operation is constructed, and the transient current is used to simulate and analyze the current bypass capacity of the copper grounding wire and the shielding suit to obtain a second analysis result; the grounding connection method between the weathering steel tower and the outage conductor is optimized based on the first analysis result and the second analysis result, and the combination scheme with the largest reduction in induced voltage is used as the target grounding scheme. Specifically, it can be achieved as follows.

[0075] In the specific implementation, the electric field analysis model of the weathering steel tower in this embodiment includes the weathering steel tower body, maintenance personnel, live conductors and the rust layer on the tower surface. During the specific construction process, the main body of the weathering steel tower is modeled in proportion using Solidworks, and the live conductor is set to a steel-core aluminum stranded wire. The loaded power frequency voltage is 110kV peak, the grounding wire is at a preset distance from the tower, and the live conductor is modeled in a cylindrical shape; the maintenance personnel are modeled according to a preset height, wherein the head of the maintenance personnel model is a sphere and the limbs are cylinders; the relative dielectric constant of the rust layer, the dielectric constant of the tower material, and the dielectric constant of the insulator are set according to preset parameters respectively; the main body of the modeled weathering steel tower and the area corresponding to the maintenance personnel are divided into triangular meshes according to the minimum unit.

[0076] It should be noted that proportional modeling is also 1:1 modeling. Specifically, the 100kV weathering steel tower can be used as a benchmark for 1:1 main body modeling. For details, please refer to Figure 2 As shown, the model consists of two parts, namely the tower body and the staff. According to the size diagram of the 110kV corner tower, the tower is 36.2m high, with a single split conductor and a ground wire above the three-phase conductor. The specific parameters are as follows: Figure 2As shown in the figure, the tower was modeled in SolidWorks. Because high-precision models often require extensive calculations, which often lead to non-convergence, the following simplifications were implemented for the 110kV tower: The tower was partially hollowed out, with the entire structure constructed as a 150mm thick plate to avoid multiple intersections. The grounding wire at the top of the tower was kept 50mm away from the tower, avoiding direct contact with the tower. This ensured that the grounding wire mesh did not affect the tower mesh. The live conductors were designed as cylinders with a diameter of 23.9mm, based on the steel-core aluminum stranded wire. When modeling maintenance personnel, the preset height can be 1.75m. For example, the maintenance worker is 1.75m tall, with a head made of a sphere and a geometric diameter of 15cm. The neck is a cylinder with a length of 5cm and a geometric diameter of 10cm. The torso is a rectangular parallelepiped with a length of 50cm and a geometric diameter of 20cm. The arms are cylinders with a length of 55cm and a geometric diameter of 7cm. The arms are bent to simulate the worker's climbing action. The lower limbs are cylinders with a length of 100cm and a geometric diameter of 12cm. For specific modeling diagrams, please refer to Figure 3 Furthermore, the relative dielectric constant of the rust layer is set to 10-20, the dielectric constant of the tower body material is 14, and the dielectric constant of the insulator is 7. The mesh is divided into free triangles, with a minimum element size of 0.01m, a total of 36,693,984 domain elements, and 2,266,588 boundary elements.

[0077] Furthermore, a megohmmeter is used to measure the resistance of the rust layer on the surface of the tower, wherein the test voltage is a preset voltage; test points are selected at different heights of the tower, and the preset number of repeated measurements at each point is averaged, and the resistance value is corrected in combination with the ambient temperature and humidity data; a finite element model is used to simulate the influence of the rust layer on the potential distribution of the tower based on the resistance value and the set dielectric constant, and the correlation between the rust layer resistance and the electric field distortion is verified; based on the verification results, the step of adding the rust layer conductive enhancer spraying is performed in the grounding scheme.

[0078] It should be noted that the megohmmeter in this embodiment has a range of 0 to 1000 MΩ, a test voltage of 500 V DC, and three test points are selected at different tower heights (5 m, 15 m, and 25 m), for example, at a temperature of 15-30 ° C and a humidity of ≤70%. For example, (1) Geometric modeling: In finite element software (such as COMSOL or ANSYS), a rust layer with a thickness of 0.5 to 2 mm (adjusted according to the actual degree of corrosion) is added to the surface of the weathering steel tower as an additional boundary layer of the tower body. Material property settings: Rust layer resistivity: Based on measured data (such as the rust layer resistance measured by the four-electrode method is 100-500 MΩ·m), input resistivity ρ = R × A / L (A is the contact area, L is the measurement distance); relative dielectric constant: set to 10 to 20; conductivity: calculated by σ = 1 / ρ, the rust layer conductivity is usually 10^-6 to 10^-8 S / m. 2. Boundary conditions and excitation settings (1) Voltage loading: Apply power frequency voltage (such as 110kV peak) to the live conductor; the grounding wire and the ground are set to 0 potential; the boundary between the tower body and the rust layer is set to a continuous potential boundary. (2) Coupling between the rust layer and the tower body: Through the "thin layer impedance" or "boundary condition" module, the rust layer is defined as a high impedance boundary layer, and its conductivity and dielectric constant parameters directly affect the current distribution. 3. Finite element simulation calculation (1) Mesh division: Locally encrypt the rust layer area (minimum unit size 0.1mm) to ensure accurate capture of the electric field gradient; the tower body uses a free tetrahedral mesh, and the air domain uses a coarse mesh to save computing resources ( Figure 2 ). (2) Equation solution: Based on Poisson equation and Laplace's equation Solve the electric potential distribution; consider the anisotropic conductivity of the rust layer (if there is uneven rust). 4. Electric field distortion analysis (1) Extract key data: tower surface potential distribution cloud map; electric field intensity near the rust layer and gradient changes; leakage current density at the tower grounding point. (2) Comparative analysis: Rust-free model: Remove the rust layer and keep the tower surface pure metal (conductivity σ=5×10^6S / m) Different rust layer parameters: Adjust the rust layer resistivity (e.g. 100MΩ·m vs 500MΩ·m) or dielectric constant (ε_r=10vs 20) and observe the difference in potential distribution. 5. Correlation verification (1) Quantitative indicators: Electric field distortion coefficient: K=(E_max-E_avg) / E_avg (E_max is the maximum field strength at the edge of the rust layer, E_avg is the average field strength when there is no rust layer); Potential gradient mutation range: the rate of change of the potential gradient in the area covered by the rust layer. (2) Data fitting: Establish a regression model of rust layer resistivity (ρ) and electric field distortion coefficient (K) (e.g. K=a·ln(ρ)+b), and verify the effectiveness of the model through simulation results. The process of correcting the resistance value based on ambient temperature and humidity data involves, for example, collecting ambient temperature and humidity data and a rust layer resistance characteristic model. Data processing software is then used to preprocess the collected temperature and humidity data, including filtering and denoising, to improve data accuracy. The corrected resistance value is then calculated based on the relationship model between rust layer resistance and temperature and humidity, along with the processed temperature and humidity data. For example, a multivariate linear regression model of rust layer resistance and temperature and humidity is established, and real-time temperature and humidity data is substituted into the model to obtain the corresponding corrected rust layer resistance value. The grounding solution also includes a step of spraying a rust layer conductivity enhancer, for example, spraying the conductivity enhancer in areas with a resistivity greater than 200 MΩ·m.

[0079] Step S20: determining the suspension potential distribution of the outage conductor during a single-circuit power outage using the Poisson equation and the Laplace equation based on the parameters involved in the weathering steel tower electric field analysis model.

[0080] In practical implementation, when calculating the electric field, the Poisson equation is more accurate and has a simpler solution. It is only related to the solution of the equation. In theory, the electric potential distribution should satisfy the following equation:

[0081]

[0082] When the volume charge density is ρ = 0, the equation to be solved becomes:

[0083]

[0084] The simulation is solved in the complex domain, and the dielectric constant in the Poisson equation or Laplace equation is replaced by the complex dielectric constant, that is, only δ+jωε needs to be replaced by ε to solve.

[0085] For any point in the solution field, the potential satisfies:

[0086]

[0087] The boundary conditions are:

[0088]

[0089] Boundaries between different types of media:

[0090]

[0091] System of equations for the variational problem:

[0092]

[0093] Where: ε represents the dielectric constant of the medium; x, y, and z are the coordinates to be solved; σ represents the conductivity of the medium; L1 is the zero-potential electrode on the tower side; Ω is the field solution range; T is the envelope curve of the solution field range; and w is the power frequency voltage.

[0094] The finite element method generally divides the entire solution domain into a finite number of small units. If the entire field to be solved is divided into m units, the potential of any discrete point in unit e can be expressed as a function of the potential of each vertex:

[0095]

[0096] For the variational problem, the relationship is expressed in the unit area as:

[0097]

[0098] By further solving, F(φ) is the functional relationship of the potential at the fixed point position contained in the entire solution field, and the variational problem equation is expressed as:

[0099]

[0100] Where n0 is the number of vertices of each small unit, e is the total number of units divided in the entire solution field, φ i is the potential value of each vertex in each divided small unit, N i e is the unit shape function.

[0101] The solved F(φ) is the integral of the potential φi (i refers to the node from 1 to node m) at each vertex in the small unit in the entire solution field. Combined with the variational principle, it can be used to solve φ i When the rate of change is zero:

[0102]

[0103] The coefficient matrix [K] can solve the electric potential φ of each node in the field iThrough these nodes, according to the relationship between various physical quantities, the parameters representing the electric field such as current and field strength are derived.

[0104] Step S30: By simulating and comparing the effects of different numbers of grounding wires, connection positions, and changes in the floating potential corresponding to the different determined operating positions on the induced voltage, and analyzing the influence of the dense rust layer formed on the surface and overlap surface of the weathering steel tower material on the tower body resistance, a first analysis result is obtained.

[0105] It should be noted that the simulation parameters involved the number of grounding wires: 1, 2, or 3; connection locations: top, middle, and bottom; and operating locations: divided into three areas along the tower height: low (5m), medium (15m), and high (25m). The specific simulation steps for the effect of the number of grounding wires on the induced voltage are: The grounding wire connection location is fixed (e.g., middle of the tower) and one, two, or three grounding wires are set; the suspended potential of the outage conductor and the electric field strength on the maintenance personnel's body surface are calculated for different configurations; and the peak induced voltage (the potential difference between the conductor and the maintenance personnel) is extracted.

[0106] Example of simulation results:

[0107]

[0108]

[0109] As shown in the table above, increasing the number of grounding wires significantly reduces the induced voltage, but with diminishing returns. Two grounding wires offers the best cost-effectiveness.

[0110] Furthermore, the simulation steps for the effect of grounding wire connection position on induced voltage were as follows: Two grounding wires were fixed, connected at the top, middle, and bottom respectively; the electric field distribution and induced voltage at different positions were compared. Key parameters: Top grounding prioritizes charge release in high-field areas, but provides insufficient coverage for bottom work areas; middle grounding provides balanced coverage of high and low areas, uniformly reducing induced voltage; bottom grounding provides insufficient protection for overhead work, which can easily lead to residual induced voltage at the top.

[0111] Furthermore, the simulation steps for analyzing the sensitivity of the working position to the induced voltage are as follows: a fixed grounding wire configuration (2 wires, top + middle) is used to calculate the induced voltage at low, medium, and high working positions respectively; and the electric field gradient and the field strength distribution on the human body surface are analyzed.

[0112] Simulation results:

[0113] Work location Induced voltage peak (kV) Maximum field strength (kV / m) Low (5m) 0.8 3.2 Medium (15m) 1.2 4.5 Height (25m) 2.1 7.8

[0114] From the table above, we can see that the induced voltage increases significantly due to the proximity of high-altitude work locations to live wires, and additional temporary grounding measures are required.

[0115] Furthermore, to simulate the effect of weathering steel rust on the tower's electrical resistance, the rust layer resistance model was modeled and simulated. Rust layer parameters were set as follows: resistivity ρ = 100-500 MΩ·m; dielectric constant ε_r = 10-20; thickness δ = 0.5-2 mm (non-uniform distribution). Simulation comparison: Rust layer model: rust layer added to the tower surface, conductivity σ = 1 / ρ. Key indicators: Tower resistance: calculated using Ohm's law R = σAL; leakage current: steady-state current between the ground wire and the tower.

[0116] The simulation results of the effect of the rust layer on the tower body resistance are as follows:

[0117] Rust layer resistivity (MΩ·m) Tower resistance (Ω) Leakage current (mA) 100 <![CDATA[1.5×10 2 ]]> 0.8 300 <![CDATA[4.5×10 2 ]]> 0.3 500 <![CDATA[7.5×10 2 ]]> 0.1

[0118] The simulation results show that for every 100 MΩ·m increase in the rust layer resistivity, the tower resistance increases approximately threefold and the leakage current decreases by 60%. The rust layer increases the tower resistance, weakening the grounding system's effectiveness and necessitating compensation through conductive enhancers or auxiliary grounding.

[0119] The simulation scenarios for analyzing uneven rust distribution include localized corrosion (ρ = 500 MΩ·m at the base of the tower only, ρ = 100 MΩ·m elsewhere) and uniform corrosion (ρ = 300 MΩ·m across the entire tower). Localized corrosion results in a leakage current approaching zero at the base and concentrated at the top (Itop = 1.2 mA). Uniform corrosion results in a balanced leakage current distribution (Iavg = 0.3 mA).

[0120] Step S40: constructing an equivalent circuit model of the maintenance operation, and using the transient current to simulate and analyze the current bypass capabilities of the copper grounding wire and the shielding suit to obtain a second analysis result.

[0121] In the specific implementation, ATP-EMTP is used to build an equivalent circuit model of maintenance operations; the transient process at the moment the grounding switch is closed is simulated to obtain the peak current and waveform of the copper grounding wire; the attenuation effect of the shielding suit impedance on the leakage current is analyzed to verify the protective effectiveness of insulating gloves during transient processes.

[0122] It should be further explained that when the maintenance personnel are preparing to ground the power-off conductor, the residual induced charge on the power-off conductor will be released by the staff's grounding device. The release process can be solved by establishing an equivalent circuit for transient calculation. This paper uses ATP-EMTP software to perform model calculations to study the transient current during the grounding process of the power-off conductor below. Since the induced charge cannot be equivalent to a constant voltage source in the circuit, and the existence of the induced charge will affect the electric field distribution between the conductors and the size of the distributed capacitance. Therefore, the existence of the induced charge is equivalent to that by adding distributed capacitance. The equivalent circuit is as follows Figure 4As shown. In the electric field distribution, the live conductors at the same height induce most of the charge. Therefore, in this equivalent model, V1 is the voltage value of the live conductor at the same height as the power-off conductor that needs to be grounded. C1, C2, and C3 are the capacitances of the live conductor, power-off conductor, and personnel to ground, respectively. C12, C13, and C23 are the mutual capacitances between the live conductor, power-off conductor, and maintenance personnel, and between the live conductor and power-off conductor, respectively. R1 and R4 are the contact resistance on the grounding rod, approximately 150Ω, and the power frequency grounding resistance, approximately 15Ω, respectively. L1 is the contact inductance of the grounding rod, approximately 0.01mH. R2 and L2 constitute the equivalent impedance on the worker's shielding suit. The closing process of switch S1 represents the process of the worker being grounded.

[0123] It should be noted that the cross-sectional area of the verified copper grounding wire is ≥25mm2, and the reference indicator for verifying the effectiveness of protection is leakage current. If the final leakage current is ≤1.6μA, it means that the protection is effective.

[0124] Step S50: Optimizing the grounding connection mode between the weathering steel tower and the power-off conductor according to the first analysis result and the second analysis result, and taking the combination scheme with the largest induced voltage reduction as the target grounding scheme.

[0125] In the specific implementation, the specific optimization process is to determine the electric field distribution of the grounding wire connected to the top, middle and bottom of the tower based on the first analysis result; determine the tower climbing path for maintenance personnel based on the electric field distribution; determine the induced voltage values of the grounding schemes corresponding to single grounding wire, double grounding wire and three grounding wires based on the second analysis result; and adjust the grounding position and the number of grounding wires based on the induced voltage values.

[0126] It should be noted that, based on the above simulation results, the grounding position and number of grounding wires can be adjusted. For example, the grounding wire configuration adopts a "top + middle" double grounding wire with a cross-sectional area ≥ 35mm 2 At the same time, a temporary grounding wire is added during high-altitude operations to limit the induced voltage to ≤1kV. In addition, the following adjustments can be made to the rust layer management, such as spraying a conductive enhancer on areas with a resistivity >200MΩ·m to reduce the local resistance to below 50MΩ·m.

[0127] Furthermore, in this embodiment, the electric field strength sensor installed in the maintenance personnel's safety helmet can be used to monitor the surface electric field strength data in real time; the monitored surface electric field strength data is sent to the ground control terminal through the Bluetooth module to generate a power plant distribution map; based on the power plant distribution map, it is detected whether the surface electric field strength at the maintenance personnel's location exceeds a preset intensity threshold; if it exceeds the preset intensity threshold, an audible and visual alarm is triggered and the maintenance personnel are prompted to adjust the maintenance tower climbing path.

[0128] It should be noted that the range of the electric field strength sensor is 0-50kV / m, with an accuracy of ±1%. In this embodiment, an example is given of the process of inspecting the tower climbing path. Considering the actual situation of the staff climbing the tower, it is best to avoid lateral movement when climbing. Therefore, 3 climbing routes are preset, which can be referred to Figure 5 As shown in the figure, Route 1 is located at positions 17-14-11-8-5-2, ascending along the side of the energized conductor. Route 2 is located at positions 18-15-12-9-6-3, ascending along the center of the tower. Route 3 is located at positions 19-16-13-10-7-4, ascending along the side of the de-energized conductor. The appropriate tower climbing route is determined by the distribution of human surface electric field strength along different routes. The following table shows the maximum human surface electric field strength at other locations.

[0129]

[0130] First, we analyze the situation at the position where the human surface electric field strength is the largest. Figures 6(a), 6(b), and 6(c) show the distribution of the human surface electric field strength at positions 2, 3, and 4 at the same height, respectively. When the worker climbs under the live wire at position 2, due to the grounding wire inside the weathering steel tower, the grounding system cannot effectively introduce the current into the ground, causing the electric field to concentrate near the tower. This causes the electric field value near it to be larger. At the same time, the closer the worker climbs to the live wire, the greater the field strength around the person. At position 2, the maximum surface electric field strength is located where the worker's hand touches the weathering steel tower, with a value of 45.04 kV / m. At the same time, the field strength at the back of the human head reaches 14.7 kV / m. The field strength at this location is too strong, so it should be avoided when climbing.

[0131] At positions 3 and 4, the electric field strength on the human surface decreases significantly. However, at position 3, due to the asymmetric field strength on both sides of the tower, the field strength distribution on the human surface is also uneven, with the field strength on the side of the body closest to the live conductor being greater than the other side. The maximum field strength is 24.27 kV / m on the hand closest to the live conductor, while the field strength on the other hand is only 8.62 kV / m. Although workers wear shielding clothing, their bodies are exposed to areas of varying electric field strength, and climbing the tower could still result in electric shock from current flowing through the body. Therefore, climbing this area is not recommended.

[0132] In contrast, the maximum electric field strength at position 4 is even lower, at only 3.58 kV / m. The tower in front of position 4, due to the poor conductivity of weathering steel, shares some of the electric field strength. Position 4 is also located in the center of the tower, placing personnel on the axis of symmetry of the electric field distribution. By comparison, the electric field strength at position 4 is more evenly distributed and the field strength is also lower. Therefore, when climbing the tower, maintenance personnel should pass through the area of position 4 at this height.

[0133] By analyzing the maximum surface field strength values at locations 2, 3, and 4 and the three pre-set routes, we can see that route 3 is more reasonable. At the same time, an analysis of the maximum field strength values at other locations along the three routes shows that route 3 is still the best choice. Figure 7 The following curves show the maximum field strength at different altitudes along the three tower climbing routes. During the first 15 meters, the differences between the three routes are minimal. However, as one approaches the conductor, the differences in field strength distribution become increasingly pronounced. Route 1 experiences a rapid increase in field strength, while Route 2 experiences a steady increase. Route 3, however, experiences a slow increase. Based on this analysis and the actual conditions of the staff, the simplest and most efficient tower climbing route is Route 3 (19-16-13-10-7-4-1).

[0134] In this embodiment, an electric field analysis model of a weathering steel tower is constructed based on a finite element simulation platform; the floating potential distribution of the outage conductor during a single power outage is determined by using the Poisson equation and the Laplace equation based on the parameters involved in the electric field analysis model of the weathering steel tower; the first analysis result is obtained by simulating and comparing the effects of different numbers of grounding wires, connection positions, and the changes in floating potential corresponding to the different operating positions determined, and analyzing the influence of the dense rust layer formed on the surface and overlap surface of the weathering steel tower material on the tower body resistance; an equivalent circuit model of the maintenance operation is constructed, and the transient current is used to simulate and analyze the current bypass capacity of the copper grounding wire and the shielding suit to obtain a second analysis result; the grounding connection method between the weathering steel tower and the outage conductor is optimized based on the first and second analysis results, and the combination scheme with the largest reduction in induced voltage is used as the target grounding scheme.

[0135] Reference Figure 8 , Figure 8 This is a structural block diagram of the first embodiment of the weathering steel tower maintenance operation anti-electric shock safety grounding device of the present invention.

[0136] like Figure 8 As shown, the anti-electric shock safety grounding device for weathering steel tower maintenance work proposed in the embodiment of the present invention includes:

[0137] A construction module 10 is used to build an electric field analysis model of a weathering steel tower based on a finite element simulation platform. The electric field analysis model of the weathering steel tower includes a weathering steel tower body, maintenance personnel, live wires, and a rust layer on the tower surface.

[0138] A processing module 20 is configured to determine the suspension potential distribution of the outage conductor during a single power outage by using the Poisson equation and the Laplace equation based on the parameters involved in the electric field analysis model of the weathering steel tower;

[0139] An analysis module 30 is configured to compare, by simulation, the effects of different numbers of grounding wires, connection positions, and changes in the floating potential corresponding to the determined different operating positions on the induced voltage, and to analyze the influence of the dense rust layer formed on the surface and overlapped surface of the weathering steel tower material on the tower body resistance, thereby obtaining a first analysis result;

[0140] The analysis module 30 is used to build an equivalent circuit model of the maintenance operation, and use the transient current to simulate and analyze the current bypass capacity of the copper grounding wire and the shielding suit to obtain a second analysis result;

[0141] The optimization module 40 is configured to optimize the grounding connection mode between the weathering steel tower and the power outage conductor according to the first analysis result and the second analysis result, and to select the combination scheme with the largest reduction in induced voltage as the target grounding scheme.

[0142] In this embodiment, an electric field analysis model of a weathering steel tower is constructed based on a finite element simulation platform; the floating potential distribution of the outage conductor during a single power outage is determined by using the Poisson equation and the Laplace equation based on the parameters involved in the electric field analysis model of the weathering steel tower; the first analysis result is obtained by simulating and comparing the effects of different numbers of grounding wires, connection positions, and the changes in floating potential corresponding to the different operating positions determined, and analyzing the influence of the dense rust layer formed on the surface and overlap surface of the weathering steel tower material on the tower body resistance; an equivalent circuit model of the maintenance operation is constructed, and the transient current is used to simulate and analyze the current bypass capacity of the copper grounding wire and the shielding suit to obtain a second analysis result; the grounding connection method between the weathering steel tower and the outage conductor is optimized based on the first and second analysis results, and the combination scheme with the largest reduction in induced voltage is used as the target grounding scheme.

[0143] In some embodiments, the construction module 10 is used to perform proportional modeling of the main body of the weathering steel tower using Solidworks;

[0144] The live conductor is set to be a steel core aluminum stranded wire, the loaded power frequency voltage is 110kV peak, the grounding wire is at a preset distance from the tower, and the live conductor is modeled as a cylinder;

[0145] Model the maintenance personnel according to the preset height, where the head of the maintenance personnel model is a sphere and the limbs are cylinders;

[0146] The relative dielectric constant of the rust layer, the dielectric constant of the tower material, and the dielectric constant of the insulator are set according to the preset parameters;

[0147] The main body of the modeled weathering steel tower and the area corresponding to the maintenance personnel are divided into triangular grids according to the smallest unit.

[0148] In some embodiments, the optimization module 40 is used to measure the resistance of the rust layer on the tower surface using a megohmmeter, wherein the test voltage is a preset voltage;

[0149] Select test points at different heights of the tower, repeat the measurement 5 times at each point to obtain the average value, and then correct the resistance value based on the ambient temperature and humidity data;

[0150] The influence of the rust layer on the tower potential distribution based on the resistance value and dielectric constant is simulated by a finite element model to verify the correlation between the rust layer resistance and the electric field distortion;

[0151] Based on the verification results, the step of spraying rust layer conductivity enhancer is performed in the grounding plan.

[0152] In some embodiments, the analysis module 40 is used to build an equivalent circuit model of the maintenance operation using ATP-EMTP;

[0153] Simulate the transient process at the moment the grounding switch is closed to obtain the peak current and waveform of the copper grounding wire;

[0154] Analyze the attenuation effect of shielding clothing impedance on leakage current;

[0155] Verify the protective effectiveness of insulating gloves during transient processes.

[0156] In some embodiments, the analysis module 40 is configured to determine the electric field distribution when the ground wire is connected to the top, middle, and bottom of the tower according to the first analysis result;

[0157] determining a tower climbing path for maintenance personnel based on the electric field distribution;

[0158] Determine the induced voltage values of the grounding schemes corresponding to a single grounding wire, two grounding wires, and three grounding wires according to the second analysis result;

[0159] The grounding position and the number of grounding wires are adjusted based on the induced voltage value.

[0160] In some embodiments, the analysis module 40 is used to monitor the electric field intensity data on the body surface in real time through an electric field intensity sensor installed in the maintenance personnel's helmet;

[0161] The monitored body surface electric field intensity data is sent to a ground control terminal via a Bluetooth module to generate an electric field distribution map;

[0162] Detecting whether the surface electric field intensity at the location of the maintenance personnel exceeds a preset intensity threshold based on the electric field distribution map;

[0163] If the intensity exceeds the preset threshold, an audible and visual alarm will be triggered and the maintenance personnel will be prompted to adjust the tower climbing path.

[0164] An embodiment of the present application also provides a weathering steel pole tower maintenance operation anti-electric shock safety grounding device, including a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus, and the memory is used to store the weathering steel pole tower maintenance operation anti-electric shock safety grounding program; the processor is used to implement the above-mentioned weathering steel pole tower maintenance operation anti-electric shock safety grounding method when executing the program stored in the memory.

[0165] The communication bus mentioned in the aforementioned weathering steel tower maintenance safety grounding device can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. This communication bus can be divided into an address bus, a data bus, and a control bus.

[0166] The communication interface is used for communication between the above-mentioned weathering steel tower maintenance operation anti-electric shock safety grounding equipment and other equipment.

[0167] The memory may include random access memory (RAM) or non-volatile memory (NVM), such as at least one disk storage. Alternatively, the memory may be at least one storage device located remote from the processor.

[0168] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0169] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. 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 computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0170] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0171] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0172] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

[0173] It should be understood that the above is only an example and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any limitation on this.

[0174] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of it according to actual needs to achieve the purpose of the embodiment scheme, and no limitation is made here.

[0175] In addition, for technical details not fully described in this embodiment, please refer to the anti-electric shock safety grounding method for weathering steel tower maintenance operations provided in any embodiment of the present invention, and will not be repeated here.

[0176] In addition, it should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0177] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0178] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, or of course by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0179] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

[0180] It is understandable that the system provided by the embodiment of the present invention corresponds to the method provided by the embodiment of the present invention, and the explanation, examples and beneficial effects of the relevant contents can refer to the corresponding parts of the above method.

Claims

1. A method for preventing electric shock during maintenance of weathering steel towers, characterized in that: The anti-electric shock safety grounding method for weathering steel tower maintenance work includes: Building an electric field analysis model for a weathering steel tower based on a finite element simulation platform. The electric field analysis model includes the weathering steel tower body, maintenance personnel, live wires, and a rust layer on the tower surface. Determine the suspension potential distribution of the outage conductor during a single power outage using the Poisson equation and the Laplace equation based on the parameters involved in the weathering steel tower electric field analysis model; The first analysis result is obtained by comparing the influence of different numbers of grounding wires, connection positions and the change of floating potential corresponding to the different working positions determined on the induced voltage by simulation, and analyzing the influence of the dense rust layer formed on the surface and overlap surface of the weathering steel tower material on the tower body resistance. Building an equivalent circuit model of the maintenance operation, and using the transient current to simulate and analyze the current bypass capability of the copper grounding wire and the shielding suit, to obtain a second analysis result; The grounding connection method between the weathering steel tower and the power-off conductor is optimized based on the first analysis result and the second analysis result, and the combination scheme with the largest reduction in induced voltage is used as the target grounding scheme.

2. The method for preventing electric shock during maintenance of weathering steel towers according to claim 1, wherein: The electric field analysis model of the weathering steel tower is constructed based on the finite element simulation platform, including: Use Solidworks to model the main body of the weathering steel tower in proportion; The live conductor is set to be a steel core aluminum stranded wire, the loaded power frequency voltage is 110kV peak, the grounding wire is at a preset distance from the tower, and the live conductor is modeled as a cylinder; Model the maintenance personnel according to the preset height, where the head of the maintenance personnel model is a sphere and the limbs are cylinders; The relative dielectric constant of the rust layer, the dielectric constant of the tower material, and the dielectric constant of the insulator are set according to the preset parameters; The main body of the modeled weathering steel tower and the area corresponding to the maintenance personnel are divided into triangular grids according to the smallest unit.

3. The method for preventing electric shock during maintenance of weathering steel towers according to claim 2, wherein: The method further comprises: Use a megohmmeter to measure the resistance of the rust layer on the tower surface, where the test voltage is the preset voltage; Select test points at different heights of the tower, repeat the measurement for a preset number of times at each point and take the average value, and then correct the resistance value in combination with the ambient temperature and humidity data; The influence of the rust layer on the potential distribution of the tower based on the resistance value and the set dielectric constant is simulated by a finite element model to verify the correlation between the rust layer resistance and the electric field distortion; Based on the verification results, the step of spraying rust layer conductivity enhancer is performed in the grounding plan.

4. The method for preventing electric shock during maintenance of weathering steel towers according to claim 1, wherein: The construction of the maintenance operation equivalent circuit model and the use of the transient current to simulate and analyze the current bypass capability of the copper grounding wire and the shielding suit include: Use ATP-EMTP to build an equivalent circuit model for maintenance operations; Simulate the transient process at the moment the grounding switch is closed to obtain the peak current and waveform of the copper grounding wire; Analyze the attenuation effect of shielding clothing impedance on leakage current; Verify the protective effectiveness of insulating gloves during transient processes.

5. The method for preventing electric shock during maintenance of weathering steel towers according to claim 1, wherein: Optimizing the grounding connection method between the weathering steel tower and the power outage conductor according to the first analysis result and the second analysis result includes: Determine the electric field distribution when the ground wire is connected to the top, middle, and bottom of the tower according to the first analysis result; determining a tower climbing path for maintenance personnel based on the electric field distribution; Determine the induced voltage values of the grounding schemes corresponding to a single grounding wire, two grounding wires, and three grounding wires according to the second analysis result; The grounding position and the number of grounding wires are adjusted based on the induced voltage value.

6. The method for preventing electric shock during maintenance of weathering steel towers according to claim 1, wherein: The method further comprises: The electric field intensity data on the body surface is monitored in real time through the electric field intensity sensor installed in the maintenance personnel's helmet; The monitored body surface electric field intensity data is sent to a ground control terminal via a Bluetooth module to generate an electric field distribution map; Detecting whether the surface electric field intensity at the location of the maintenance personnel exceeds a preset intensity threshold based on the electric field distribution map; If the intensity exceeds the preset threshold, an audible and visual alarm will be triggered and the maintenance personnel will be prompted to adjust the tower climbing path.

7. A weathering steel tower maintenance operation anti-electric shock safety grounding device, characterized in that: The anti-electric shock safety grounding device for weathering steel tower maintenance operation includes: A construction module is used to build an electric field analysis model of a weathering steel tower based on a finite element simulation platform. The electric field analysis model of the weathering steel tower includes a weathering steel tower body, maintenance personnel, live wires, and a rust layer on the tower surface. A processing module, configured to determine the suspension potential distribution of the outage conductor during a single power outage by using the Poisson equation and the Laplace equation based on the parameters involved in the electric field analysis model of the weathering steel tower; An analysis module is configured to compare, by simulation, the effects of different numbers of grounding wires, connection positions, and changes in the suspended potential corresponding to the different operating positions determined on the induced voltage, and to analyze the influence of the dense rust layer formed on the surface and overlapped surface of the weathering steel tower material on the tower body resistance, thereby obtaining a first analysis result; The analysis module is used to build an equivalent circuit model of the maintenance operation, and use the transient current to simulate and analyze the current bypass capacity of the copper grounding wire and the shielding suit to obtain a second analysis result; The optimization module is used to optimize the grounding connection method between the weathering steel tower and the power-off conductor according to the first analysis result and the second analysis result, and to take the combination scheme with the largest reduction in induced voltage as the target grounding scheme.

8. The anti-electric shock safety grounding device for weathering steel tower maintenance work according to claim 7, characterized in that: The construction module is used to perform proportional modeling of the main body of the weathering steel tower using Solidworks; The live conductor is set to be a steel core aluminum stranded wire, the loaded power frequency voltage is 110kV peak, the grounding wire is at a preset distance from the tower, and the live conductor is modeled as a cylinder; Model the maintenance personnel according to the preset height, where the head of the maintenance personnel model is a sphere and the limbs are cylinders; The relative dielectric constant of the rust layer, the dielectric constant of the tower material, and the dielectric constant of the insulator are set according to the preset parameters; The main body of the modeled weathering steel tower and the area corresponding to the maintenance personnel are divided into triangular grids according to the smallest unit.

9. The anti-electric shock safety grounding device for weathering steel tower maintenance work according to claim 8, characterized in that: The optimization module is used to measure the resistance of the rust layer on the tower surface using a megohmmeter, wherein the test voltage is a preset voltage; Select test points at different heights of the tower, repeat the measurement 5 times at each point to obtain the average value, and then correct the resistance value based on the ambient temperature and humidity data; The influence of the rust layer on the tower potential distribution based on the resistance value and dielectric constant is simulated by a finite element model to verify the correlation between the rust layer resistance and the electric field distortion; Based on the verification results, the step of spraying rust layer conductivity enhancer is performed in the grounding plan.

10. The anti-electric shock safety grounding device for weathering steel tower maintenance work according to claim 7, characterized in that: The analysis module is used to build an equivalent circuit model of the maintenance operation using ATP-EMTP; Simulate the transient process at the moment the grounding switch is closed to obtain the peak current and waveform of the copper grounding wire; Analyze the attenuation effect of shielding clothing impedance on leakage current; Verify the protective effectiveness of insulating gloves during transient processes.

Images