Pipeline lightning stroke hazard assessment method, device, equipment, storage medium and product

Abstract

The invention discloses a pipeline lightning stroke hazard assessment method, device and equipment, a storage medium and a product. Determining the lightning stroke probability of the target pipe section according to the position of each target ground flash point, the ground lightning density and the initial position and the final position of the target pipe section; under the condition that the lightning stroke probability is greater than a lightning stroke probability threshold value, determining a soil ionization radius of a current ground flash point for each target ground flash point; under the condition that the vertical distance from the current flash point to the target pipe section is smaller than or equal to the soil ionization radius, the breakdown probability of the coating of the target pipe section is determined; under the condition that the breakdown probability is larger than a breakdown probability threshold value, if target heat generated by the maximum lightning current corresponding to the current ground flash point is larger than or equal to a preset heat threshold value, the pipe body ablation depth of the target pipe section is determined; according to the ablation depth of the pipe body, the lightning stroke damage degree of the target pipe section is evaluated. And the accuracy and practicability of pipeline lightning stroke hazard assessment are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of pipeline safety assessment technology, and in particular to a method, apparatus, equipment, storage medium, and product for assessing pipeline lightning hazard. Background Technology

[0002] As a critical infrastructure for transporting vital energy sources such as oil and natural gas, the safe and stable operation of buried steel pipelines plays a crucial role in ensuring energy supply and maintaining the normal functioning of the social economy. However, with global climate change and increasingly frequent lightning strikes, the risk of pipelines being struck by lightning has increased. Lightning strikes can cause the pipeline's anti-corrosion layer to puncture and the pipe body to burn, leading to subsequent hazards such as media leakage, fire, and explosion, resulting in huge economic losses and safety accidents, endangering the lives of surrounding people and the ecological environment, and seriously threatening the safe operation of pipelines. Therefore, assessing the hazards of lightning strikes to pipelines is of great significance for the safe operation and maintenance of pipelines.

[0003] Currently, the domestic standard GB / T 50698-2011, "Technical Standard for AC Interference Protection of Buried Steel Pipelines," provides protective measures against transmission line faults and lightning interference, including optimized grounding systems, installation of drainage devices, and ensuring minimum safe distances between pipelines and transmission line towers and grounding electrodes. However, this standard only considers soil resistivity when setting safe distances, without considering the soil resistivity after ionization based on soil ionization models. The accuracy of safe distances needs to be determined and improved, and it lacks assessment methods and specific evaluation details for the hazards of lightning strikes to pipelines. European standard CEN / TS15280 "Assessment of the likelihood of AC corrosion in buried cathodic protection pipelines", NACE SP 0177 "Measures to mitigate the effects of AC current and lightning strikes on metallic structures and corrosion control systems", and ISO-15589-1 "Catholic protection for pipeline transport systems" and other relevant international standards only provide qualitative protection against lightning strikes and transmission line fault currents, recommending two protection methods: installing fault shielding wires and centralized grounding. They do not address the assessment methods for the hazards and damage to pipelines caused by lightning strikes and transmission line faults, nor do they cover the key threshold indicators required for assessment. Therefore, there is a lack of targeted and highly accurate standard support for engineering design, hazard assessment methods, and protection methods for pipelines affected by lightning strikes and transmission line faults.

[0004] Regarding methods for assessing lightning strike hazards, the "A Method for Assessing and Early Warning of Low-Amplitude Direct Lightning Strikes in Distribution Networks" (CN119510915A) determines the corrected grounding shunt coefficient and the tower top overvoltage of each tower by measuring the maximum grounding resistance, tower height, and tower span of the target tower in the distribution network, and sets the withstand voltage threshold of the target tower, thus solving the problem of how to accurately determine the tower top overvoltage. However, this lightning hazard assessment method only addresses lightning hazards caused by direct lightning strikes, and current research on lightning hazard risk assessment methods focuses on power systems such as transmission lines and high-speed rail contact networks, lacking a lightning hazard assessment method for buried oil and gas pipelines. Regarding pipeline damage caused by lightning strikes, the "Experimental Device and Method for Oil and Gas Pipeline Damage under Multiple Lightning Strikes" (CN113740689A) and the "Special Device and Method for Simulating Pipeline Erosion by Lightning Current" (CN107807146A) use an impulse current generator to simulate lightning current near the pipeline, considering environmental factors such as temperature, humidity, and soil environment, and construct a lightning strike simulation experimental device to obtain the impact of lightning current erosion on the pipeline, damage excitation, and damage characteristics, but lack specific assessment methods for pipeline lightning hazards.

[0005] In summary, although current research reports emphasize the importance of soil ionization models in the study of the impact of lightning strikes on pipelines, the protective measures provided by relevant standards lack accuracy because they do not consider the influence of soil ionization models on the determination results. At the same time, current patents lack methods for assessing lightning hazard to pipelines, making it difficult to accurately assess the lightning hazard to pipelines in actual engineering projects. Summary of the Invention

[0006] This invention provides a method, apparatus, equipment, storage medium, and product for assessing pipeline lightning hazard, in order to solve the problems of low accuracy and poor practicality of existing pipeline lightning hazard assessment methods.

[0007] According to one aspect of the present invention, a method for assessing pipeline lightning hazard is provided, comprising:

[0008] The probability of lightning strike on the target pipe segment is determined based on the location of each target flash point, the flash density, and the start and end points of the target pipe segment.

[0009] When the lightning strike probability is greater than the lightning strike probability threshold, the soil ionization radius of the current flash point is determined for each target flash point.

[0010] If the vertical distance from the current flash point to the target pipe segment is less than or equal to the soil ionization radius, determine the breakdown probability of the coating of the target pipe segment.

[0011] If the breakdown probability is greater than the breakdown probability threshold, and the target heat generated by the maximum lightning current corresponding to the current ground flash point is greater than or equal to the preset heat threshold, then the pipe body ablation depth of the target pipe segment is determined.

[0012] The degree of lightning damage to the target pipe section is assessed based on the ablation depth of the pipe body.

[0013] According to another aspect of the present invention, a pipeline lightning strike hazard assessment device is provided, comprising:

[0014] The lightning strike probability determination module is used to determine the lightning strike probability of the target pipe segment based on the location of each target flash point, the flash density, and the start and end positions of the target pipe segment.

[0015] The radius determination module is used to determine the soil ionization radius of each target flash point when the lightning strike probability is greater than the lightning strike probability threshold.

[0016] The breakdown probability determination module is used to determine the breakdown probability of the coating of the target pipe segment when the vertical distance from the current flash point to the target pipe segment is less than or equal to the soil ionization radius.

[0017] The depth determination module is used to determine the pipe ablation depth of the target pipe segment if the target heat generated by the maximum lightning current corresponding to the current ground flash point is greater than or equal to a preset heat threshold when the breakdown probability is greater than a breakdown probability threshold.

[0018] The severity determination module is used to assess the degree of lightning damage to the target pipe section based on the ablation depth of the pipe body.

[0019] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0020] At least one processor; and

[0021] A memory communicatively connected to the at least one processor; wherein,

[0022] The memory stores a deterministic machine program that can be executed by the at least one processor, which enables the at least one processor to perform the pipeline lightning hazard assessment method according to any embodiment of the present invention.

[0023] According to another aspect of the present invention, a deterministic machine-readable storage medium is provided, the deterministic machine-readable storage medium storing deterministic machine instructions, the deterministic machine instructions being used to cause a processor to execute the pipeline lightning hazard assessment method according to any embodiment of the present invention.

[0024] According to another aspect of the present invention, a deterministic machine program product is provided, the deterministic machine program product including a deterministic machine program, which, when executed by a processor, implements the pipeline lightning hazard assessment method according to any embodiment of the present invention.

[0025] The technical solution provided by this invention determines the lightning strike probability of a target pipe segment based on the location of each target flash point, the flash density, and the start and end positions of the target pipe segment. If the lightning strike probability is greater than a lightning strike probability threshold, the soil ionization radius of each target flash point is determined. If the vertical distance from the current flash point to the target pipe segment is less than or equal to the soil ionization radius, the breakdown probability of the coating of the target pipe segment is determined. If the breakdown probability is greater than a breakdown probability threshold, and if the target heat generated by the maximum lightning current corresponding to the current flash point is greater than or equal to a preset heat threshold, the pipe body ablation depth of the target pipe segment is determined. Based on the pipe body ablation depth, the degree of lightning damage to the target pipe segment is assessed. By comprehensively considering the location of the ground flash point, the ground flash density, and the location of the target pipe section, the probability of lightning strike is determined. When the probability of lightning strike is greater than the lightning strike probability threshold, the soil ionization radius is assessed for each ground flash point. If the target pipe is within the soil ionization radius, the breakdown probability is assessed to accurately determine the possibility of damage to the pipe section coating by lightning strike. Furthermore, the ablation depth of the pipe body is determined by combining the heat of the lightning current, thereby achieving a quantitative assessment of lightning strike hazards and effectively improving the accuracy and practicality of pipeline lightning strike hazard assessment.

[0026] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0028] Figure 1 This is a flowchart of a pipeline lightning hazard assessment method provided in Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of a target flash point determination provided in Embodiment 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of a structure for forming a conical molten pit through pipe erosion according to Embodiment 1 of the present invention;

[0031] Figure 4 This is a flowchart of a lightning strike hazard assessment method provided in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of a soil ionization radius provided in an embodiment of the present invention;

[0033] Figure 6 A schematic diagram illustrating an effective interception area provided in an embodiment of the present invention;

[0034] Figure 7 This is a flowchart of a coating breakdown probability calculation provided in an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of a pipeline lightning hazard assessment device provided in Embodiment 2 of the present invention;

[0036] Figure 9 This is a schematic diagram of the structure of an electronic device provided in Embodiment 3 of the present invention. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] Example 1

[0040] Figure 1This is a flowchart of a pipeline lightning hazard assessment method provided in Embodiment 1 of the present invention. This embodiment is applicable to situations where pipelines are assessed for lightning hazards. The method can be executed by a pipeline lightning hazard assessment device, which can be implemented in hardware and / or software and can be configured in an electronic device. Figure 1 As shown, the method includes:

[0041] S110. Determine the lightning strike probability of the target pipe segment based on the location of each target flash point, the flash density, and the starting and ending positions of the target pipe segment.

[0042] In this embodiment, a ground flash point can be understood as a potential grounding point that may be struck by lightning, predicted through relevant technical means. This embodiment does not limit the relevant technical means. A target ground flash point can be understood as a ground flash point that may pose a lightning strike threat to the target pipe section. Ground flash density can be understood as the number of times a ground flash occurs at a ground flash point, used to measure the frequency of lightning activity. A target pipe section can be understood as a section of pipe selected from the pipeline for analysis. The length of the target pipe section can be determined according to actual conditions. Lightning strike probability can be understood as the likelihood that the target pipe section will be struck by lightning.

[0043] It is worth noting that the location of the flash point at the target site, as well as the starting and ending points of the target pipe section, can be represented by longitude and latitude. Alternatively, the longitude and latitude of each location can be converted to coordinates in a Cartesian coordinate system. In this embodiment, the method of converting the longitude and latitude of each location to coordinates in a Cartesian coordinate system will be used for illustration.

[0044] Specifically, considering that some flash points are far from the target pipe section and will not have any actual impact on it, these flash points are not included in the calculation of the lightning strike probability. That is, based on the initially obtained locations of the flash points, as well as the start and end positions of the target pipe section, the vertical distance from each flash point to the target pipe section is calculated. Flash points with a vertical distance less than or equal to a preset distance threshold are identified as target flash points. Then, based on the location of each target flash point, the flash density, and the start and end positions of the target pipe section, the lightning strike probability of the target pipe section is determined. The preset distance threshold can be set according to actual conditions, for example, a preset distance threshold of 10 kilometers.

[0045] For example, Figure 2 This is a schematic diagram illustrating the determination of the flash point at a target location, provided in Embodiment 1 of the present invention. Figure 2 As shown, a target pipeline is divided into 3 segments, with the starting position of the first segment being A(x). A ,y A The endpoint is B(x).B ,y B The starting position of the second pipe section is B(x). B ,y B The endpoint is C(x). C ,y C The starting position of the third pipe segment is C(x). C ,y C The endpoint is D(x). D ,y D Taking the first pipe segment as the research object and determining its corresponding target flash point as an example, after calculation, the distances from the flash point (x1,y1) and the flash point (x2,y2) to the first pipe segment are 9 kilometers and 7 kilometers respectively, both less than 10 kilometers. Therefore, these two flash points are the target flash points. However, the distance from the flash point (x3,y3) to the first pipe segment is 12 kilometers, which is greater than 10 kilometers. Therefore, this flash point is not considered as the target flash point.

[0046] S120. When the lightning strike probability is greater than the lightning strike probability threshold, determine the soil ionization radius of the current flash point for each target flash point.

[0047] In this embodiment, the lightning strike probability threshold can be understood as a pre-set threshold, such as a lightning strike probability threshold set to 10%. The soil ionization radius can be understood as the range within which the surrounding soil is ionized due to the thermal effect of the lightning current after a lightning strike.

[0048] Specifically, it is determined whether the probability of a lightning strike is greater than the lightning strike probability threshold. If the probability of a lightning strike is greater than the lightning strike probability threshold, it indicates that the target pipe section faces a high risk of lightning strike. At this time, for each target flash point, the soil ionization radius of the current flash point is calculated to further analyze the specific impact of each target flash point on the target pipe section.

[0049] Optionally, if the lightning strike probability is less than or equal to the lightning strike probability threshold, it indicates that the target pipe section is at low risk of being struck by lightning, and there is no need to further analyze the flash point of each target.

[0050] S130. If the vertical distance from the current flash point to the target pipe segment is less than or equal to the soil ionization radius, determine the breakdown probability of the coating of the target pipe segment.

[0051] Specifically, determine whether the vertical distance from the current flash point to the target pipe segment is less than or equal to the soil ionization radius. If so, it indicates that the target pipe segment is within the soil ionization radius corresponding to the current flash point and the target pipe segment will be struck by lightning. At this time, calculate the breakdown probability of the coating of the target pipe segment to further assess the potential damage of the lightning strike to the coating.

[0052] S140. If the breakdown probability is greater than the breakdown probability threshold, and the target heat generated by the maximum lightning current corresponding to the current ground flash point is greater than or equal to the preset heat threshold, then the pipe body ablation depth of the target pipe section is determined.

[0053] In this embodiment, the breakdown probability threshold can be understood as a pre-set threshold used to determine whether a lightning strike may cause coating breakdown. For example, the breakdown probability threshold can be set to 10%. The preset heat threshold is used to determine whether the target heat can cause ablation of the target pipe section. The target heat can be understood as the heat generated by the thermal effect of the maximum lightning current when it passes through the target pipe section. This heat is a key factor leading to pipe ablation. The magnitude of the target heat is related to the maximum lightning current and its duration.

[0054] Specifically, when the breakdown probability exceeds the breakdown probability threshold, it indicates that the coating of the target pipe section has been breached. Because when the coating breaks, the maximum lightning current flows through the pipe body along the break point, and when the heat generated by the maximum lightning current is large enough, it will cause the pipe body of the target section to melt and form a conical crater, such as... Figure 3 As shown, the buried pipeline (i.e., the target pipe section) is punctured, creating a conical melting crater. The radius of the base area of ​​this cone is r, and its height is h. Conversely, if the generated heat is insufficient, pipe erosion will not occur. Therefore, before determining the pipe erosion depth of the target pipe section, the target heat generated by the maximum lightning current should be determined first, and it should be further determined whether the target heat generated by the maximum lightning current corresponding to the current ground flash point is greater than or equal to the preset heat threshold.

[0055] First, based on the resistivity of carbon steel and the base area of ​​the preset minimum tube erosion cone, the tube material resistance of the minimum tube erosion cone is determined using the following algorithm. The minimum tube erosion cone can be understood as a theoretical model used to determine whether a lightning strike is sufficient to cause tube ablation.

[0056]

[0057] Among them, R min The resistance of the tube material representing the minimum tube-dissolved cone; ρ 碳钢 This represents the resistivity of carbon steel, and its value can be set to 1.0 × 10⁻⁷ Ω·m; S min This represents the minimum base area of ​​the tube-shaped dissolution cone, which can be set to 1 cm². 2 ; r represents the radius of the smallest tube-dissolved cone.

[0058] Furthermore, based on the maximum lightning current and its duration, the target heat can be calculated using the following algorithm:

[0059] Q = I m2 R min t

[0060] Where Q represents the target heat, I m R represents the maximum lightning current, t represents the duration of the maximum lightning current, and R represents the maximum lightning current. min This represents the resistance of the tube material in the smallest tube that dissolves the cone.

[0061] Furthermore, based on the base area and height of the smallest tube-body dissolution cone, the molten mass of the smallest tube-body dissolution cone is calculated:

[0062]

[0063] Where, m min This represents the molten mass of the minimum tube-shaped erosion cone; ρ represents the density of carbon steel, which can be set to 7850 kg / m³. 3 S min This represents the minimum base area of ​​the tube-shaped dissolution cone, which can be set to 1 cm². 2 H min This represents the height of the minimum tube-shaped erosion cone, and its value can be set according to the actual situation; for example, it can be set to 1 nm. The calculated m... min = 2.617 × 10⁻¹⁰ kg.

[0064] Furthermore, based on the molten mass of the minimum tube-dissolved cone, the preset heat threshold is calculated using the following algorithm:

[0065] Q min =Cm min Δt

[0066] Among them, Q min This indicates the preset heat threshold; C represents the specific heat capacity of carbon steel, which can be set to 0.46 kJ / (kg·℃); Δt represents the preset carbon steel temperature difference, which is the temperature difference from the ambient temperature to the melting point of carbon steel, 1538℃. The ambient temperature can be set according to specific circumstances, for example, the ambient temperature can be set to 25℃.

[0067] Then, it is determined whether the target heat is greater than or equal to the preset heat threshold. If so, it is determined that the maximum lightning current can cause pipe body ablation of the target pipe section. Then, the pipe body ablation depth of the target pipe section is calculated to assess the degree of damage to the target pipe section.

[0068] S150. Assess the degree of lightning damage to the target pipe section based on the ablation depth of the pipe body.

[0069] Specifically, when the ablation depth of the pipe body is less than the first percentage (e.g., 10%) of the original wall thickness of the target pipe section, it indicates that the lightning strike hazard is mild, and continuous observation of the target pipe is required; when the ablation depth of the pipe body is greater than or equal to the second percentage (e.g., 20%) of the original wall thickness of the target pipe section, it indicates that the lightning strike hazard is severe, and the target pipe section needs to be repaired or replaced; when the ablation depth of the pipe body is greater than or equal to the first percentage of the original wall thickness and less than the second percentage of the original wall thickness, it indicates that the lightning strike hazard is moderate, and staff should be reminded to conduct on-site assessment or excavation verification.

[0070] Here, the original wall thickness can be understood as the thickness of the target pipe section when it has not suffered any corrosion, wear, or physical damage. The first percentage and the second percentage can be set according to the actual situation, and are not limited in this embodiment. It is worth noting that the first percentage is less than the second percentage.

[0071] For example, Figure 4 This is a flowchart of a lightning strike hazard assessment method provided in an embodiment of the present invention, such as... Figure 4 As shown, calculate the target heat Q generated by the maximum lightning current corresponding to the current ground flash point, and determine whether Q ≥ 1.827 × 10⁻⁶. -4 If J is present, calculate the pipe ablation depth h and determine if h is greater than or equal to 10% of the original wall thickness. If not, continue observation. If h is present, calculate if h is greater than or equal to 20% of the original wall thickness. If not, conduct a safety assessment. If h is present, repair or replace the pipe section. Optional, Q < 1.827 × 10 -4 J, stop calculation.

[0072] The technical solution provided in Embodiment 1 of this invention determines the lightning strike probability of a target pipe segment based on the location of each target flash point, the flash density, and the start and end positions of the target pipe segment. If the lightning strike probability is greater than a lightning strike probability threshold, the soil ionization radius of each target flash point is determined. If the vertical distance from the current flash point to the target pipe segment is less than or equal to the soil ionization radius, the breakdown probability of the coating of the target pipe segment is determined. If the breakdown probability is greater than a breakdown probability threshold, and if the target heat generated by the maximum lightning current corresponding to the current flash point is greater than or equal to a preset heat threshold, the pipe body ablation depth of the target pipe segment is determined. Based on the pipe body ablation depth, the degree of lightning damage to the target pipe segment is assessed. By comprehensively considering the location of the ground flash point, the ground flash density, and the location of the target pipe section, the probability of lightning strike is determined. When the probability of lightning strike is greater than the lightning strike probability threshold, the soil ionization radius is assessed for each ground flash point. If the target pipe is within the soil ionization radius, the breakdown probability is assessed to accurately determine the possibility of damage to the pipe section coating by lightning strike. Furthermore, the ablation depth of the pipe body is determined by combining the heat of the lightning current, thereby achieving a quantitative assessment of lightning strike hazards and effectively improving the accuracy and practicality of pipeline lightning strike hazard assessment.

[0073] In some embodiments, determining the lightning strike probability of a target pipe segment based on the location of each target flash point, the flash density, and the start and end positions of the target pipe segment includes: for each target flash point, determining a first distance based on the current location of the flash point and the start position of the target pipe segment; determining a second distance based on the current location of the flash point and the end position of the target pipe segment; and determining the lightning strike probability of the target pipe segment based on the first distance, the second distance, and the flash density of each target flash point. This technical solution effectively improves the accuracy of calculating the lightning strike probability of the target pipe segment, providing a reliable basis for further assessing lightning damage.

[0074] In this embodiment, if each location is represented by longitude and latitude, the distance d1 between any two locations can be calculated according to the following longitude-latitude conversion distance algorithm:

[0075]

[0076] in, θ represents longitude, and θ represents latitude; that is... It can represent the coordinates of one of the positions. It can represent the coordinates of another location; R represents the radius.

[0077] Alternatively, the longitude and latitude of each location can be converted to coordinates in a rectangular coordinate system, and then the distance d2 between any two locations can be calculated using the following Euclidean distance algorithm:

[0078]

[0079] Among them, (x i ,y i (x) represents the coordinates of one of the positions. N ,y N ) represents the coordinates of another location.

[0080] Specifically, this embodiment uses the conversion of the longitude and latitude of each location into coordinates in a rectangular coordinate system as an example. For each target flash point, a first distance is calculated based on the current flash point's location and the target pipe segment's location; a second distance is calculated based on the current flash point's location and the target pipe segment's endpoint location. Then, based on the first and second distances of each target flash point and the flash density, the lightning strike probability of the target pipe segment is determined using the following algorithm:

[0081]

[0082] Where P(A) represents the probability of lightning strike on the target pipe section; n represents the total number of target flash points; and fb i db represents the ground flash density at the i-th ground flash point. i De represents the first distance of the i-th flash point. i This represents the second distance of the i-th flash point.

[0083] In some embodiments, determining the soil ionization radius of the current flash point includes: determining the critical ionization gradient of the soil based on the original soil resistivity corresponding to the current flash point; and determining the soil ionization radius based on the maximum lightning current, the critical ionization gradient of the soil, and the original soil resistivity.

[0084] In this embodiment, the original soil resistivity can be understood as the resistivity of the soil in its natural state, without being affected by external factors (such as lightning strikes).

[0085] Specifically, considering the close relationship between the critical ionization gradient of soil and the original soil resistivity, the critical ionization gradient algorithm is obtained by fitting the original soil resistivity of the sample with the critical ionization gradient of the sample:

[0086] E c =241×ρ soil 0.215

[0087] Among them, E c Represents the critical ionization gradient of the soil; ρ soil This represents the original soil resistivity, and the formula is applicable to original soil resistivity in the range of 0 to 2000 Ω·m.

[0088] Furthermore, based on the original soil resistivity and soil critical ionization gradient algorithm corresponding to the current ground flash point, the corresponding soil critical ionization gradient is calculated.

[0089] Since soil ionization occurs, all metallic objects within the ionization region will be attached to the electric arc formed in the soil, resulting in zero potential difference between these metallic objects. The ionization radius can be obtained using the following ionization radius algorithm:

[0090]

[0091] Where, r ion Indicates the soil ionization radius; I m E represents the maximum lightning current. c Represents the critical ionization gradient of the soil; ρ soil This represents the original soil resistivity.

[0092] It is noteworthy that when extremely high-intensity lightning current discharges through a grounding electrode, a high current density is generated, causing the electric field around and near the grounding electrode to exceed the soil's breakdown strength or critical electric field, thus leading to soil ionization near the electrode. During this process, an arc-shaped trajectory appears on the surface of soil particles, increasing with the current density to a threshold. When the current density exceeds this threshold, the soil breaks down and generates a spark discharge, causing soil ionization. This results in a sudden drop in soil resistivity to 0.003%-47% of the original soil resistivity, significantly increasing soil conductivity and making the soil a good conductor. This phenomenon is known as the soil ionization effect.

[0093] For example, Figure 5 This is a schematic diagram of a soil ionization radius provided in an embodiment of the present invention, as shown below. Figure 5 As shown, r0 represents the ionization radius of the soil before it is struck by lightning, at which point the original soil resistivity is ρ. soil When soil is struck by lightning, it becomes ionized, and the ionization radius corresponding to the ionization region is r. ion At this point, the resistivity within the ionization radius is ρ. i .

[0094] In current technologies, soil ionization models established based on the soil ionization effect include soil ionization models based on the increase of the geometric mean radius of the grounding electrode, soil ionization models based on the decrease of soil resistivity, and soil ionization models based on the principle of energy balance. Among them, the soil ionization model based on the increase of the geometric mean radius of the grounding electrode ignores the dynamic changes in soil resistivity, has large errors under high current, and cannot explain the energy dissipation or temperature effects during the ionization process; the soil ionization model based on the decrease of soil resistivity requires a large amount of experimental data to calibrate the resistivity change law, does not consider energy conservation, and may overestimate the ionization range; the soil ionization model based on the principle of energy balance is computationally complex, highly sensitive to parameters such as soil heat capacity and thermal conductivity, and difficult to calibrate.

[0095] In this embodiment, based on the propagation law of lightning current in soil and pipelines, a system is established based on the original soil resistivity and critical electric field strength (i.e., the critical ionization gradient E of the soil). c The soil ionization model (i.e., the ionization radius algorithm) is used. Because the resistivity of ionized soil differs significantly from the original soil resistivity, the calculated safe distance between pipelines and transmission line towers can differ by more than 50%, and the assessment results can differ by as much as 650 times. Therefore, when a fault current of tens of kA enters the ground, the resulting soil ionization effect has a strong impact on pipelines, making the soil ionization model crucial for accurately assessing the impact of lightning current on pipelines.

[0096] In some embodiments, determining the breakdown probability of the coating of the target pipe segment includes: determining the probability density of each lightning current within a preset lightning current range corresponding to the current ground flash point and the interception area ratio of the target pipe segment under the corresponding lightning current conditions; determining the probability-weighted risk value of the target pipe segment based on the probability density of each lightning current and the interception area ratio; and determining the breakdown probability based on the probability-weighted risk value and the ground flash density of the current ground flash point. By analyzing the probability density of each lightning current and the corresponding interception area ratio, combined with the ground flash density, the lightning strike risk of the target pipe segment can be accurately assessed, thereby effectively improving the accuracy and reliability of lightning strike risk assessment.

[0097] In this embodiment, the preset lightning current range can be understood as a possible range of lightning current values ​​set according to actual conditions. Within this range, the probability of different magnitudes of lightning current occurring varies, and they will have different degrees of impact on the target pipe section. For example, the preset lightning current range is 1kA to 200kA. Probability density can be understood as the density of the likelihood of each lightning current value occurring within the preset lightning current range. The interception area ratio can be understood as the proportion of the area around the target pipe section that may be affected by lightning strikes, and is a direct indicator for measuring the risk of the target pipe section being affected by lightning strikes.

[0098] Specifically, considering the uneven probability distribution of lightning current occurrence, when determining the probability density of each lightning current within the preset lightning current range corresponding to the current ground flash point, the probability density function of the log-normal distribution can be used for approximate calculation. The specific algorithm is as follows:

[0099]

[0100] Where f(I) represents the probability density of lightning current I; μ represents the mean of the distribution, μ = 31.1 kA; and σ represents the standard deviation of the distribution, σ = 0.484.

[0101] Furthermore, the interception area ratio of the target pipe segment under the corresponding lightning current conditions is calculated;

[0102] The probability density of each lightning current is multiplied by the corresponding interception area ratio, and then the products under all lightning current conditions are summed to obtain the probability-weighted risk value of the target pipe section.

[0103] For example, considering that each lightning strike event may occur with a specific lightning current probability, the probability-weighted risk of a target pipe section being severely affected by a single lightning strike can be quantified based on the probability density of each lightning current and the interception area ratio using the following formula:

[0104]

[0105] Among them, R (I) P represents the probability-weighted risk value of the target pipe section, where f(I) represents the probability density when the lightning current is I; B (I) represents the interception area ratio when the lightning current is I.

[0106] Furthermore, assuming that lightning events are independent, the breakdown probability of the coating on the target pipe section can be calculated using the following algorithm based on the probability-weighted risk value and the current lightning density at the lightning flash point:

[0107]

[0108] Where P represents the breakdown probability of the coating on the target pipe section, and R (I) N represents the probability-weighted risk value of the target pipe segment. G This indicates the current ground flash density at the ground flash point.

[0109] In some embodiments, determining the interception area ratio of the target pipe segment under corresponding lightning current conditions includes: determining a critical distance based on the corresponding lightning current, the original soil resistivity, a preset ionization coefficient, the coating breakdown voltage of the target pipe segment, and the depth and outer radius of the target pipe segment; determining the effective interception area of ​​the target pipe segment based on the critical distance and the length of the target pipe segment; and determining the interception area ratio of the target pipe segment based on the effective interception area.

[0110] In this embodiment, the preset ionization coefficient can be understood as a coefficient value set according to the actual situation and a preset value range. The depth of the target pipe segment can be understood as the distance from the center of the target pipe segment to the ground surface. The coating breakdown voltage of the target pipe segment can be understood as the minimum voltage that causes damage to the coating of the target pipe segment. The critical distance can be understood as the maximum distance between the target pipe segment and the lightning strike location where coating breakdown may occur under a certain level of lightning current. The effective interception area can be understood as the area around the target pipe segment that may be affected by lightning strikes.

[0111] Specifically, based on the corresponding lightning current, original soil resistivity, preset ionization coefficient, and coating breakdown voltage of the target pipe segment, as well as the depth and outer radius of the target pipe segment, the critical distance is calculated using the following formula:

[0112]

[0113] Where, m·ρ soil V represents the soil resistivity after ionization; m represents the preset ionization coefficient, with a preset value range of 0.003%-1%, which can be set within the preset range according to actual conditions; I represents the corresponding lightning current, ranging from 1kA to 200kA; V B Indicates the coating breakdown voltage of the target pipe section; d p Indicates the depth of the target pipe section; r p Indicates the outer radius of the target pipe section.

[0114] It is worth noting that when the vertical distance D1 between the target flash point and the target pipe section is less than or equal to the critical distance D(I), the coating may be severely damaged; when the vertical distance D1 is greater than the critical distance D(I), the coating is not expected to be severely damaged, and the effect of the target flash point on the coating of the target pipe section can be ignored.

[0115] Furthermore, Figure 6 A schematic diagram of an effective interception area provided by an embodiment of the present invention, as shown below. Figure 6 As shown, the effective interception area A(I) is related to the critical distance D(I) and the length L of the target pipe segment (pipeline). The effective interception area A(I) can be calculated by the following formula:

[0116] A(I)=2×D(I)×L×λ

[0117] Where A(I) represents the effective interception area, D(I) represents the critical distance, L represents the length of the target pipe section, and λ represents the physical characteristic correction factor of the target pipe section.

[0118] Furthermore, based on the effective interception area A(I) and the area of ​​1 square kilometer, the interception area ratio P of the target pipe segment can be obtained through the following algorithm. B (I):

[0119]

[0120] For example, Figure 7 This is a flowchart of a coating breakdown probability calculation provided by an embodiment of the present invention, such as... Figure 7 As shown, first calculate the critical distance D; determine whether the vertical distance D1 between the target flash point and the target pipe segment is less than or equal to the critical distance D; if so, calculate the effective interception area A, and calculate the interception area ratio P based on the effective interception area A. B (I), based on the interception area ratio P B (I) Calculate the probability-weighted risk R (I) Then, the coating breakdown probability P is calculated based on probability-weighted risk.

[0121] Optional; otherwise, ignore the effect of this point on the pipe coating.

[0122] In some embodiments, determining the ablation depth of the target pipe segment includes: determining the ablation depth of the target pipe segment based on the maximum lightning current, the duration of the maximum lightning current, the specific heat capacity of carbon steel, a preset carbon steel temperature difference, the density of carbon steel, and a preset ablation area. The above technical solution accurately calculates the ablation depth of the target pipe segment, laying the foundation for further improving the accuracy of lightning damage assessment of target pipe segments.

[0123] In this embodiment, the specific heat capacity of carbon steel can be understood as the amount of heat that carbon steel needs to absorb to raise its temperature by a unit. The preset carbon steel temperature difference can be understood as the temperature difference from the ambient temperature to the melting point of carbon steel, 1538°C, where the ambient temperature can be set according to specific circumstances. The preset ablation area can be understood as a pre-set ablation area.

[0124] Specifically, the shape of the crater caused by lightning current is usually approximately cone-shaped, such as... Figure 3 As shown, determining the pipe ablation depth is therefore the process of calculating the height of the cone. Based on the maximum lightning current, the duration of the maximum lightning current, the specific heat capacity of carbon steel, the preset carbon steel temperature difference, the carbon steel density, and the preset ablation base area, the pipe ablation depth h of the target pipe section is determined using the following algorithm:

[0125]

[0126] Where, ρ 碳钢 The resistivity of carbon steel, for example, ρ. 碳钢 =1.0×10 -7 Ω·m; R represents the resistance of the tube material of the molten pit; I represents the maximum lightning current; t represents the duration of the maximum lightning current; C represents the specific heat capacity of carbon steel, for example, C can be 0.46kJ / (kg·℃); ρ represents the density of carbon steel (7850kg / m3); Δt represents the preset carbon steel temperature difference; S represents the preset ablation bottom area, the value range is 1cm3~5cm3, and can be set within the range according to the actual situation.

[0127] The above technical solution allows for the accurate calculation of the ablation depth of the target pipe section, effectively improving the accuracy of current lightning damage assessment.

[0128] Example 2

[0129] Figure 8 This is a schematic diagram of a pipeline lightning hazard assessment device provided in Embodiment 2 of the present invention. Figure 8 As shown, the device includes:

[0130] The lightning strike probability determination module 21 is used to determine the lightning strike probability of the target pipe segment based on the location of each target flash point, the flash density, and the start and end positions of the target pipe segment.

[0131] The radius determination module 22 is used to determine the soil ionization radius of the current flash point for each target flash point when the lightning strike probability is greater than the lightning strike probability threshold.

[0132] The breakdown probability determination module 23 is used to determine the breakdown probability of the coating of the target pipe segment when the vertical distance from the current flash point to the target pipe segment is less than or equal to the soil ionization radius.

[0133] The depth determination module 24 is used to determine the pipe body ablation depth of the target pipe segment if the target heat generated by the maximum lightning current corresponding to the current ground flash point is greater than or equal to a preset heat threshold when the breakdown probability is greater than the breakdown probability threshold.

[0134] The severity determination module 25 is used to assess the degree of lightning damage to the target pipe section based on the ablation depth of the pipe body.

[0135] The technical solution provided in Embodiment 2 of the present invention effectively improves the accuracy and practicality of pipeline lightning hazard assessment.

[0136] Optionally, the lightning strike probability determination module 21 includes:

[0137] The distance determination unit is used to determine a first distance for each target flash point based on the current flash point's location and the starting position of the target pipe segment, and to determine a second distance based on the current flash point's location and the ending position of the target pipe segment;

[0138] The lightning strike probability determination unit is used to determine the lightning strike probability of the target pipe section based on the first distance, the second distance, and the lightning density of each target flash point.

[0139] Optionally, the radius determination module 22 includes:

[0140] The gradient determination unit is used to determine the critical ionization gradient of the soil based on the original soil resistivity corresponding to the current ground flash point.

[0141] The radius determination unit is used to determine the soil ionization radius based on the maximum lightning current, the critical ionization gradient of the soil, and the original soil resistivity.

[0142] Optionally, the breakdown probability determination module 23 includes:

[0143] The interception area ratio determination unit is used to determine the probability density of each lightning current in the preset lightning current range corresponding to the current ground flash point and the interception area ratio of the target pipe segment under the corresponding lightning current conditions.

[0144] The risk value determination unit is used to determine the probability-weighted risk value of the target pipe segment based on the probability density of each lightning current and the interception area ratio.

[0145] The breakdown probability determination unit is used to determine the breakdown probability based on the probability-weighted risk value and the ground flash density at the current ground flash point.

[0146] Optionally, the interception area ratio determination unit includes:

[0147] The critical distance determination subunit is used to determine the critical distance based on the corresponding lightning current, the original soil resistivity, the preset ionization coefficient, the coating breakdown voltage of the target pipe segment, and the depth and outer radius of the target pipe segment.

[0148] The interception area determination subunit is used to determine the effective interception area of ​​the target pipe segment based on the critical distance and the length of the target pipe segment;

[0149] The interception area ratio determination subunit is used to determine the interception area ratio of the target pipe segment based on the effective interception area.

[0150] Optionally, the depth determination module 24 is specifically used to determine the pipe body ablation depth of the target pipe section based on the maximum lightning current, the duration of the maximum lightning current, the specific heat capacity of carbon steel, the preset carbon steel temperature difference, the carbon steel density, and the preset ablation bottom area.

[0151] The pipeline lightning hazard assessment device provided in this embodiment of the invention can execute the pipeline lightning hazard assessment method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0152] Example 3

[0153] Figure 9 This is a schematic diagram of an electronic device according to Embodiment 3 of the present invention. This electronic device is intended to represent various forms of digital decision-making machines, such as laptop decision-making machines, desktop decision-making machines, workbenches, personal digital assistants, servers, blade servers, large decision-making machines, and other suitable decision-making machines. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar decision-making devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0154] like Figure 9 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores a deterministic machine program executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the deterministic machine program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0155] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0156] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and determination capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) determination chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as pipeline lightning strike hazard assessment methods.

[0157] In some embodiments, the pipeline lightning hazard assessment method may be implemented as a deterministic machine program tangibly contained in a deterministic machine-readable storage medium, such as storage unit 18. In some embodiments, part or all of the deterministic machine program may be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the deterministic machine program is loaded into RAM 13 and executed by processor 11, one or more steps of the pipeline lightning hazard assessment method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the pipeline lightning hazard assessment method by any other suitable means (e.g., by means of firmware).

[0158] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload programmable logic devices (CPLDs), deterministic hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more deterministic programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0159] The deterministic machine program used to implement the method of the present invention can be written in any combination of one or more programming languages. These deterministic machine programs can be provided to a processor of a general-purpose deterministic machine, a special-purpose deterministic machine, or other programmable data processing device, such that when executed by the processor, the deterministic machine program causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The deterministic machine program can be executed entirely on the machine, partially on the machine, as a standalone software package partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0160] In the context of this invention, a deterministic machine-readable storage medium can be a tangible medium that may contain or store deterministic machine programs for use by or in conjunction with an instruction execution system, apparatus, or device. A deterministic machine-readable storage medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, a deterministic machine-readable storage medium can be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable deterministic disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0161] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0162] The systems and technologies described herein can be implemented in a defined system that includes backend components (e.g., as a data server), or a defined system that includes middleware components (e.g., an application server), or a defined system that includes frontend components (e.g., a user terminal with a graphical user interface or web browser through which a user can interact with the implementation of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication (e.g., a communication network) of any form or medium. Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0163] A deterministic system can include clients and servers. Clients and servers are generally geographically separated and typically interact via a communication network. The client-server relationship is established by deterministic machine programs running on the respective deterministic machines and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud deterministic server or cloud host, which is a hosting product within the cloud deterministic service ecosystem. This addresses the shortcomings of traditional physical hosting and VPS services, such as high management difficulty and weak business scalability.

[0164] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0165] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

[0166] This invention also provides a determination machine program product, including a determination machine program and / or instructions, which, when executed by a processor, implements the pipeline lightning hazard assessment method provided in any embodiment of this application.

[0167] In implementing the deterministic machine program product, deterministic machine program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's deterministic machine, partially on the user's deterministic machine, as a standalone software package, partially on the user's deterministic machine and partially on a remote deterministic machine, or entirely on a remote deterministic machine or server. In cases involving a remote deterministic machine, the remote deterministic machine can be connected to the user's deterministic machine via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external deterministic machine (e.g., via the Internet using an Internet service provider).

[0168] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for assessing pipeline lightning hazard, characterized in that, include: The probability of lightning strike on the target pipe segment is determined based on the location of each target flash point, the flash density, and the start and end points of the target pipe segment. When the lightning strike probability is greater than the lightning strike probability threshold, the soil ionization radius of the current flash point is determined for each target flash point. If the vertical distance from the current flash point to the target pipe segment is less than or equal to the soil ionization radius, determine the breakdown probability of the coating of the target pipe segment. If the breakdown probability is greater than the breakdown probability threshold, and the target heat generated by the maximum lightning current corresponding to the current ground flash point is greater than or equal to the preset heat threshold, then the pipe body ablation depth of the target pipe segment is determined. The degree of lightning damage to the target pipe section is assessed based on the ablation depth of the pipe body.

2. The method according to claim 1, characterized in that, The determination of the lightning strike probability of the target pipe segment based on the location of each target flash point, the flash density, and the start and end positions of the target pipe segment includes: For each target flash point, a first distance is determined based on the current flash point's location and the starting position of the target pipe segment, and a second distance is determined based on the current flash point's location and the ending position of the target pipe segment; The probability of lightning strike on the target pipe section is determined based on the first distance, the second distance, and the lightning density of each target flash point.

3. The method according to claim 1, characterized in that, The determination of the soil ionization radius at the current flash point includes: Determine the critical ionization gradient of the soil based on the original soil resistivity corresponding to the current ground flash point; The soil ionization radius is determined based on the maximum lightning current, the critical ionization gradient of the soil, and the original soil resistivity.

4. The method according to claim 1, characterized in that, Determining the breakdown probability of the coating on the target pipe segment includes: Determine the probability density of each lightning current in the preset lightning current range corresponding to the current ground flash point and the interception area ratio of the target pipe segment under the corresponding lightning current conditions. Based on the probability density of each lightning current and the interception area ratio, the probability-weighted risk value of the target pipe segment is determined. The breakdown probability is determined based on the probability-weighted risk value and the current ground flash density at the ground flash point.

5. The method according to claim 4, characterized in that, Determining the interception area ratio of the target pipe segment under the corresponding lightning current conditions includes: The critical distance is determined based on the corresponding lightning current, original soil resistivity, preset ionization coefficient, coating breakdown voltage of the target pipe segment, and the depth and outer radius of the target pipe segment. Based on the critical distance and the length of the target pipe segment, the effective interception area of ​​the target pipe segment is determined; Based on the effective interception area, the interception area ratio of the target pipe segment is determined.

6. The method according to claim 1, characterized in that, Determining the ablation depth of the target pipe section includes: The ablation depth of the target pipe section is determined based on the maximum lightning current, the duration of the maximum lightning current, the specific heat capacity of carbon steel, the preset temperature difference of carbon steel, the density of carbon steel, and the preset ablation bottom area.

7. A pipeline lightning strike hazard assessment device, characterized in that, include: The lightning strike probability determination module is used to determine the lightning strike probability of the target pipe segment based on the location of each target flash point, the flash density, and the start and end positions of the target pipe segment. The radius determination module is used to determine the soil ionization radius of each target flash point when the lightning strike probability is greater than the lightning strike probability threshold. The breakdown probability determination module is used to determine the breakdown probability of the coating of the target pipe segment when the vertical distance from the current flash point to the target pipe segment is less than or equal to the soil ionization radius. The depth determination module is used to determine the pipe ablation depth of the target pipe segment if the target heat generated by the maximum lightning current corresponding to the current ground flash point is greater than or equal to a preset heat threshold when the breakdown probability is greater than a breakdown probability threshold. The severity determination module is used to assess the degree of lightning damage to the target pipe section based on the ablation depth of the pipe body.

8. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a deterministic machine program that can be executed by the at least one processor to enable the at least one processor to perform the pipeline lightning hazard assessment method as described in any one of claims 1-6.

9. A deterministic machine-readable storage medium, characterized in that, The deterministic machine-readable storage medium stores deterministic machine instructions, which are used to cause the processor to implement the pipeline lightning hazard assessment method as described in any one of claims 1-6.

10. A deterministic machine program product, characterized in that, The determination machine program product includes a determination machine program, which, when executed by a processor, implements the pipeline lightning hazard assessment method as described in any one of claims 1-6.

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