Method, apparatus, and processor for determining ampacity of damaged conductor

Abstract

The embodiment of the present application provides a kind of method, device and processor for determining the carrying capacity of damaged conductor, belong to transmission line field.The method for determining the carrying capacity of damaged conductor includes: by the method of finite element, node division is carried out to damaged conductor, to obtain the multiple nodes corresponding to damaged conductor;Obtain the node related information and node environment information corresponding to each node, wherein, node related information includes node temperature, node environment information includes the sunshine radiation intensity, wind speed, wind direction angle and environmental temperature corresponding to node;Current is injected to damaged conductor, and according to node related information and node environment information, the node steady state temperature corresponding to each node when reaching thermal equilibrium condition is determined;According to node steady state temperature and preset conductor temperature threshold, the injection current of damaged conductor is adjusted, to obtain the maximum bearing current corresponding to damaged conductor.The technical scheme of the embodiment of the present application can determine the carrying capacity of damaged conductor.

Description

Technical Field

[0001] This invention relates to the field of power transmission lines, and more specifically to a method, apparatus, and processor for determining the current-carrying capacity of a damaged conductor. Background Technology

[0002] As overhead transmission lines age, damage and broken strands inevitably occur, or conductors may break due to unexpected faults. Due to power supply requirements, timely power outages for conductor and ground wire replacement are often impossible. In such cases, verifying the conductor's load-bearing capacity is crucial; exceeding the line's load limit could lead to a short circuit and line breakage. However, current technology lacks methods for determining the current-carrying capacity of damaged conductors. Summary of the Invention

[0003] The purpose of this invention is to provide a method, processor, apparatus, and storage medium for determining the current-carrying capacity of a damaged conductor, in order to solve the aforementioned problems existing in the prior art.

[0004] To achieve the above objectives, a first aspect of the present invention provides a method for determining the current-carrying capacity of a damaged conductor, the method comprising:

[0005] The damaged conductor is divided into nodes using the finite element method to obtain multiple nodes corresponding to the damaged conductor.

[0006] Obtain the node-related information and node environment information corresponding to each node. The node-related information includes the node temperature, and the node environment information includes the solar radiation intensity, wind speed, wind direction angle and ambient temperature corresponding to the node.

[0007] Inject current into the damaged conductor, and determine the steady-state temperature of each node when it reaches thermal equilibrium based on node-related information and node environmental information.

[0008] Based on the steady-state temperature of the node and the preset conductor temperature threshold, the injected current of the damaged conductor is adjusted to obtain the maximum current that the damaged conductor can withstand.

[0009] In this embodiment of the invention, determining the steady-state temperature of each node when it reaches thermal equilibrium based on node-related information and node environment information includes: determining the first solar radiation absorption, first convective heat dissipation, and first radiative heat dissipation of each node at the current moment based on the first node-related information and node environment information corresponding to each node at the current moment; determining the first equilibrium current of each node when it reaches thermal equilibrium based on the first solar radiation absorption, first convective heat dissipation, first radiative heat dissipation, and first node-related information; determining the second node-related information of each node at the next moment based on the first equilibrium current, the first node-related information, and a preset time interval; and determining the steady-state temperature of each node when it reaches thermal equilibrium based on the second node-related information and node environment information. The second solar radiation absorption, second convective heat dissipation, and second radiative heat dissipation at the next moment are calculated. Based on the second solar radiation absorption, second convective heat dissipation, second radiative heat dissipation, and relevant information about the second node, the second equilibrium current corresponding to the node when it reaches thermal equilibrium at the next moment is determined. Based on the first equilibrium current and the second equilibrium current, the node current change rate corresponding to each node is determined, and based on the relevant information about the first node and the second node, the node temperature change rate corresponding to each node is determined. If the node current change rate corresponding to each node is within a preset current change rate range and the node temperature change rate corresponding to each node is within a preset temperature change rate range, the second node temperature in the relevant information about the second node is determined as the node steady-state temperature.

[0010] In this embodiment of the invention, the injected current of the damaged conductor is adjusted according to the steady-state temperature of the node and a preset conductor temperature threshold to obtain the maximum current that the damaged conductor can withstand. This includes: when the steady-state temperature of a node is lower than the preset conductor temperature threshold, increasing the injected current of the damaged conductor until the difference between the steady-state temperature of each node and the preset conductor temperature threshold is within a preset temperature deviation range, and determining that the current injected into the damaged conductor is the maximum current that can withstand; when the steady-state temperature of a node is higher than the preset conductor temperature threshold, decreasing the injected current of the damaged conductor until the difference between the steady-state temperature of each node and the preset conductor temperature threshold is within a preset temperature deviation range, and determining that the current injected into the damaged conductor is the maximum current that can withstand.

[0011] In this embodiment of the invention, the first node-related information further includes the first node resistance; based on the first solar heat absorption, the first convective heat dissipation, the first radiative heat dissipation, and the first node-related information, determining the first equilibrium current corresponding to each node when it reaches thermal equilibrium at the current moment includes: determining the first node resistance based on the first node temperature in the first node-related information according to the pre-stored correspondence between resistance and temperature; determining the sum of the first convective heat dissipation and the first radiative heat dissipation to obtain the first total heat dissipation; determining the difference between the first total heat dissipation and the first solar heat absorption to obtain the first resistance heat generation; and determining the first equilibrium current based on the first resistance heat generation and the first node resistance.

[0012] In this embodiment of the invention, the first node-related information further includes the first node resistance; determining the second node-related information corresponding to each node at the next moment based on the first balance current, the first node-related information, and a preset time interval includes: determining the first node resistance based on the first node temperature in the first node-related information according to a pre-stored correspondence between resistance and temperature; determining the heat generated by the node within the preset time interval based on the first balance current, the first node resistance, and the preset time interval; and determining the second node temperature in the second node-related information based on the heat generated and a preset specific heat capacity.

[0013] In this embodiment of the invention, the first node-related information also includes the first node diameter corresponding to the node; determining the first solar heat absorption, first convective heat dissipation, and first radiative heat dissipation corresponding to each node at the current moment based on the first node-related information and node environmental information at the current moment includes: determining the first solar heat absorption based on a preset solar heat absorption algorithm, according to the solar radiation intensity corresponding to the node, the first node diameter, and a preset heat absorption coefficient; determining the first convective heat dissipation based on a preset convective heat dissipation algorithm, according to the wind speed, wind direction angle, ambient temperature, first node temperature, first node diameter, and a preset convective heat dissipation coefficient corresponding to the node; and determining the first radiative heat dissipation based on a preset radiative heat dissipation algorithm, according to the ambient temperature, first node temperature, first node diameter, and a preset radiative heat dissipation coefficient corresponding to the node.

[0014] In this embodiment of the invention, obtaining node-related information and node environment information corresponding to each node includes: obtaining conductor-related information of the damaged conductor and conductor environment information of the environment in which the damaged conductor is located, wherein the conductor-related information includes conductor temperature, and the conductor environment information includes solar radiation intensity, wind speed, wind direction angle and ambient temperature corresponding to the conductor; and determining the node-related information and node environment information corresponding to each node based on the location information of each node on the damaged conductor, the conductor-related information and the conductor environment information.

[0015] A second aspect of the present invention provides a processor configured to perform the method described above for determining the current-carrying capacity of a damaged conductor.

[0016] A third aspect of the present invention provides an apparatus for determining the current-carrying capacity of a damaged conductor, comprising:

[0017] The node partitioning module is used to partition the damaged conductor into nodes using the finite element method, so as to obtain multiple nodes corresponding to the damaged conductor.

[0018] The node information acquisition module is used to acquire the node-related information and node environmental information corresponding to each node. The node-related information includes the node temperature, and the node environmental information includes the solar radiation intensity, wind speed, wind direction angle and ambient temperature corresponding to the node.

[0019] The steady-state temperature determination module is used to inject current into the damaged conductor and determine the steady-state temperature of each node when it reaches thermal equilibrium, based on node-related information and node environmental information.

[0020] The current-carrying capacity determination module is used to adjust the injected current of the damaged conductor based on the steady-state temperature of the node and the preset conductor temperature threshold, so as to obtain the maximum current that the damaged conductor can withstand.

[0021] A fourth aspect of the present invention provides a machine-readable storage medium storing a program or instructions that, when executed by a processor, implement the method described above for determining the current-carrying capacity of a damaged conductor.

[0022] The above technical solution uses the finite element method to divide the damaged conductor into nodes. After injecting current into the damaged conductor, it determines the steady-state temperature of each node when thermal equilibrium is reached based on node-related information and environmental information. Then, based on the node steady-state temperature and a preset conductor temperature threshold, the injected current into the damaged conductor is adjusted to obtain the maximum current carrying capacity of the damaged conductor. This technical solution overcomes the shortcomings of existing technologies that cannot determine the current-carrying capacity of damaged conductors. By dividing the damaged conductor into nodes using the finite element method, it considers the conductor damage situation and determines the node steady-state temperature at thermal equilibrium based on the temperature and environmental information of each node. The load-bearing limit of the damaged conductor is then determined based on the node steady-state temperature and the preset conductor temperature threshold, improving the accuracy of the current-carrying capacity result and better reflecting actual operating conditions. It has the advantages of comprehensive consideration and high practicality.

[0023] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 The illustration shows a flowchart of a method for determining the current-carrying capacity of a damaged conductor in one embodiment of the present invention.

[0026] Figure 2 The schematic diagram illustrates a process flow diagram of a method for determining the current-carrying capacity of a damaged conductor in another embodiment of the present invention;

[0027] Figure 3 The schematic diagram illustrates a process flow diagram of a method for determining the current-carrying capacity of a damaged conductor in another embodiment of the present invention;

[0028] Figure 4 This schematically illustrates a front view of the finite element model and mesh generation of the conductor load capacity in one embodiment of the present invention;

[0029] Figure 5 This schematically illustrates a cross-sectional view of the finite element model and mesh generation of the conductor load capacity in one embodiment of the present invention;

[0030] Figure 6 The diagram illustrates the structure of a device for determining the current-carrying capacity of a damaged conductor according to an embodiment of the present invention. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0034] Figure 1 The illustration schematically shows a flowchart of a method for determining the current-carrying capacity of a damaged conductor according to an embodiment of the present invention. Figure 1 As shown, in this embodiment of the invention, a method for determining the current-carrying capacity of a damaged conductor is provided. Taking the application of this method to a processor as an example, the method may include the following steps:

[0035] Step S102: The damaged conductor is divided into nodes using the finite element method to obtain multiple nodes corresponding to the damaged conductor.

[0036] Step S104: Obtain the node-related information and node environment information corresponding to each node. The node-related information includes the node temperature, and the node environment information includes the solar radiation intensity, wind speed, wind direction angle, and ambient temperature corresponding to the node.

[0037] Step S106: Inject current into the damaged conductor, and determine the steady-state temperature of each node when it reaches thermal equilibrium based on node-related information and node environment information.

[0038] Step S108: Adjust the injected current of the damaged conductor according to the steady-state temperature of the node and the preset conductor temperature threshold to obtain the maximum current that the damaged conductor can withstand.

[0039] It is understood that damaged conductors refer to transmission line conductors that have experienced breakage, broken strands, or reduced wire diameter. Node-related information refers to information about the node itself, including its temperature, which can be obtained through temperature detection equipment. Node environmental information refers to the environmental information corresponding to the node, including solar radiation intensity, wind speed, wind direction angle, and ambient temperature, which can be obtained through appropriate detection equipment. Thermal equilibrium condition is a state where the sum of heat generated and absorbed equals the heat dissipated, and the node current and temperature at each node remain relatively stable. Understandably, after current is injected into the conductor, the resistance on the conductor generates heat, thus increasing the temperature of the nodes. The steady-state node temperature is the node temperature at which thermal equilibrium is achieved, and this value can be calculated. The preset conductor temperature threshold is the maximum allowable temperature of the conductor determined in advance. The maximum current carrying capacity is the maximum current that the conductor can withstand, i.e., the conductor's load-bearing limit.

[0040] Specifically, the processor can divide the damaged conductor into nodes using the finite element method to obtain multiple nodes corresponding to the damaged conductor. For example, the finite element method can be used to divide the structural model corresponding to the damaged conductor into nodes, thereby obtaining a finite element model of the conductor including multiple nodes, and acquiring node-related information and node environmental information corresponding to each node. The node-related information includes node temperature, and the node environmental information includes solar radiation intensity, wind speed, wind direction angle, and ambient temperature corresponding to the node. Then, current is injected into the damaged conductor, and based on the node-related information and node environmental information, the steady-state temperature of each node when thermal equilibrium is reached is determined. Based on the node steady-state temperature and a preset conductor temperature threshold, the injected current of the damaged conductor is adjusted to obtain the maximum current that the damaged conductor can withstand. For example, the processor can adjust the injected current so that the difference between the node steady-state temperature of each node and the preset conductor temperature threshold is within a preset deviation range. The injected current at this time is the maximum current that the damaged conductor can withstand.

[0041] The aforementioned method for determining the current-carrying capacity of a damaged conductor uses the finite element method to divide the damaged conductor into nodes. After injecting current into the damaged conductor, it determines the steady-state temperature of each node when thermal equilibrium is reached based on node-related information and environmental information. Then, based on the node steady-state temperature and a preset conductor temperature threshold, the injected current is adjusted to obtain the maximum current the damaged conductor can withstand. This technical solution overcomes the shortcomings of existing technologies in determining the current-carrying capacity of damaged conductors. By dividing the damaged conductor into nodes using the finite element method, it considers the conductor damage situation and determines the node steady-state temperature at thermal equilibrium based on the temperature and environmental information of each node. The load-bearing limit of the damaged conductor is then determined based on the node steady-state temperature and a preset conductor temperature threshold, improving the accuracy of the current-carrying capacity results and better reflecting actual operating conditions. It has advantages such as comprehensive consideration and high practicality.

[0042] In one embodiment, determining the steady-state temperature of each node when it reaches thermal equilibrium based on node-related information and node environmental information includes: determining the first solar radiation absorption, first convective heat dissipation, and first radiative heat dissipation of each node at the current moment based on the first node-related information and node environmental information; determining the first equilibrium current of each node when it reaches thermal equilibrium based on the first solar radiation absorption, first convective heat dissipation, first radiative heat dissipation, and first node-related information; determining the second node-related information of each node at the next moment based on the first equilibrium current, the first node-related information, and a preset time interval; and determining the steady-state temperature of each node when it reaches thermal equilibrium based on the second node-related information and node environmental information. The second solar radiation absorption, second convective heat dissipation, and second radiative heat dissipation at the next moment are calculated. Based on the second solar radiation absorption, second convective heat dissipation, second radiative heat dissipation, and relevant information about the second node, the second equilibrium current corresponding to the node when it reaches thermal equilibrium at the next moment is determined. Based on the first equilibrium current and the second equilibrium current, the node current change rate corresponding to each node is determined, and based on the relevant information about the first node and the second node, the node temperature change rate corresponding to each node is determined. If the node current change rate corresponding to each node is within a preset current change rate range and the node temperature change rate corresponding to each node is within a preset temperature change rate range, the second node temperature in the relevant information about the second node is determined as the node steady-state temperature.

[0043] It can be understood that the first node-related information refers to the node-related information (which may include node temperature) at the current moment. Specifically, the first node-related information may include the first node temperature. Further, in some embodiments, the first node-related information may also include node information such as node diameter. The first solar heat absorption is the solar heat absorption at the current moment, the first convective heat dissipation is the convective heat dissipation at the current moment, the first radiative heat dissipation is the radiative heat dissipation at the current moment, and the first balance current is the current value when the node's heat dissipation, heat absorption, and heat generation reach equilibrium at the current moment. The preset time interval is a pre-set time interval between the current moment and the next moment, for example, 1 second. The second node-related information refers to the node-related information (which may include node temperature) at the next moment. Specifically, the second node-related information may include the second node temperature. The second solar heat absorption is the solar heat absorption at the next moment, the first convective heat dissipation is the convective heat dissipation at the next moment, the first radiative heat dissipation is the radiative heat dissipation at the next moment, and the second balance current is the current value when the node's heat dissipation, heat absorption, and heat generation reach equilibrium at the next moment. The node current change rate is the ratio of the difference between the second balancing current and the first balancing current to the first balancing current. The node temperature change rate is the ratio of the difference between the second node temperature in the second node's related information and the first node temperature in the first node's related information to the first node temperature. The preset current change rate range is a pre-set range, for example, 0.1% ± 0.05%. The preset temperature change rate range is a pre-set range, for example, 0.1% ± 0.05%.

[0044] Specifically, the processor can determine the first solar heat absorption of each node at the current moment based on the solar absorption formula, according to the first node-related information and node environment information corresponding to each node at the current moment; determine the first convective heat dissipation of each node at the current moment based on the convective heat dissipation formula, according to the first node-related information and node environment information corresponding to each node at the current moment; and determine the first radiative heat dissipation of each node at the current moment based on the radiative heat dissipation formula, according to the first node-related information and node environment information corresponding to each node at the current moment. Furthermore, based on the principle of thermal balance, the processor can determine the first equilibrium current corresponding to each node when thermal equilibrium is reached at the current moment, according to the first solar heat absorption, first convective heat dissipation, first radiative heat dissipation, and first node-related information. For example, the processor can determine the corresponding first node resistance based on the first node temperature in the first node-related information, thereby determining the first equilibrium current based on the first solar heat absorption, first convective heat dissipation, first radiative heat dissipation, and first node resistance. Since the node resistance itself generates heat after the injected current, the node temperature will constantly change. Therefore, the processor needs to determine the second node-related information for each node at the next moment based on the first equilibrium current, the first node-related information, and the preset time interval. For example, the processor can determine the heat generated by the node within the preset time interval based on the first equilibrium current, the first node-related information, and the preset time interval, and then determine the second node temperature in the second node-related information based on the heat generated and the specific heat capacity of the node. After determining the second node temperature, the processor can determine the second solar radiation absorption, second convection heat dissipation, and second radiation heat dissipation for each node at the next moment based on the second node-related information and the node environment information. Based on the second solar radiation absorption, second convection heat dissipation, second radiation heat dissipation, and the second node-related information, the processor can determine the second equilibrium current corresponding to the node when it reaches thermal equilibrium at the next moment. Based on the first equilibrium current and the second equilibrium current, the processor can determine the node current change rate for each node, and the node temperature change rate for each node based on the first node-related information and the second node-related information. If the node current change rate for each node is within the preset current change rate range and the node temperature change rate for each node is within the preset temperature change rate range, the second node temperature in the second node-related information is determined to be the node steady-state temperature.

[0045] In one embodiment, the injected current of the damaged conductor is adjusted according to the steady-state temperature of the node and a preset conductor temperature threshold to obtain the maximum current that the damaged conductor can withstand. This includes: when the steady-state temperature of a node is lower than the preset conductor temperature threshold, increasing the injected current of the damaged conductor until the difference between the steady-state temperature of each node and the preset conductor temperature threshold is within a preset temperature deviation range, and determining that the current injected into the damaged conductor is the maximum current that can withstand; when the steady-state temperature of a node is higher than the preset conductor temperature threshold, decreasing the injected current of the damaged conductor until the difference between the steady-state temperature of each node and the preset conductor temperature threshold is within a preset temperature deviation range, and determining that the current injected into the damaged conductor is the maximum current that can withstand.

[0046] It is understandable that the preset temperature deviation range is a pre-set temperature deviation range, which can be a temperature value or a percentage value, etc.

[0047] Specifically, the processor can compare the steady-state temperature of a node with a preset wire temperature threshold. If the steady-state temperature of a node is lower than the preset wire temperature threshold, the injected current of the damaged wire can be increased. That is, the injected current can be changed until the difference between the steady-state temperature of each node and the preset wire temperature threshold is within the preset temperature deviation range. At this time, the increased and adjusted injected current is the maximum current that the damaged wire can withstand. If the steady-state temperature of a node is higher than the preset wire temperature threshold, the injected current of the damaged wire can be decreased until the difference between the steady-state temperature of each node and the preset wire temperature threshold is within the preset temperature deviation range. At this time, the decreased and adjusted injected current is the maximum current that the damaged wire can withstand.

[0048] In one embodiment, the first node-related information further includes the first node resistance; determining the first equilibrium current corresponding to each node when it reaches thermal equilibrium at the current moment, based on the first solar heat absorption, the first convective heat dissipation, the first radiative heat dissipation, and the first node-related information, includes: determining the first node resistance based on the first node temperature in the first node-related information, based on the pre-stored correspondence between resistance and temperature; determining the sum of the first convective heat dissipation and the first radiative heat dissipation to obtain the first total heat dissipation; determining the difference between the first total heat dissipation and the first solar heat absorption to obtain the first resistance heat generation; and determining the first equilibrium current based on the first resistance heat generation and the first node resistance.

[0049] It is understandable that there is a one-to-one correspondence between resistance and temperature. The pre-stored correspondence between resistance and temperature can be in the form of an algorithm or a table. The first resistance heat generation is the heat generated by the resistance of each node after current is injected into the wire at the current moment. The first total heat dissipation is the total heat dissipation of each node at the current moment, specifically the sum of the first convective heat dissipation and the first radiative heat dissipation. The first resistance heat generation is the heat generated by the resistance of each node at the current moment.

[0050] Specifically, the processor can determine the corresponding first node resistance based on the pre-stored correspondence between resistance and temperature, according to the first node temperature in the first node information, and determine the sum of the first convective heat dissipation and the first radiative heat dissipation to obtain the first total heat dissipation. Then, it can determine the difference between the first total heat dissipation and the first solar radiation heat absorption to obtain the first resistance heat generation. Based on the first resistance heat generation and the first node resistance, the first balance current is determined, i.e., first resistance heat generation + first solar radiation heat absorption = first convective heat dissipation + first radiative heat dissipation, and first resistance heat generation = i 2 After obtaining the heat generated by the first resistor, the first equilibrium current i can be determined based on the heat generated by the first resistor and the resistance R of the first node. Similarly, the calculation process of the second equilibrium current is basically similar to that of the first equilibrium current, and will not be elaborated further here.

[0051] In one embodiment, the first node-related information further includes the first node resistance; determining the second node-related information corresponding to each node at the next moment based on the first balance current, the first node-related information, and a preset time interval includes: determining the first node resistance based on the first node temperature in the first node-related information according to a pre-stored correspondence between resistance and temperature; determining the heat generated by the node within the preset time interval based on the first balance current, the first node resistance, and the preset time interval; and determining the second node temperature in the second node-related information based on the heat generated and a preset specific heat capacity.

[0052] It is understandable that the preset specific heat capacity is the specific heat capacity corresponding to the resistance of a predetermined node.

[0053] Specifically, the processor can determine the first node resistance based on the pre-stored correspondence between resistance and temperature, according to the first node temperature in the first node's related information, and determine the heat generated by the node within the preset time interval based on the first balance current, the first node resistance, and the preset time interval. Then, based on the heat generated and the preset specific heat capacity, the processor can determine the second node temperature in the second node's related information. For example, the heat generated by the node within the preset time interval = i 2 R·Δt, temperature at the second node = i 2 R·Δt / C p Where i is the first balancing current, R is the first node resistance, Δt is the preset time interval, and Cp This is the preset specific heat capacity.

[0054] In one embodiment, the first node-related information also includes the first node diameter corresponding to the node; determining the first solar heat absorption, first convective heat dissipation, and first radiative heat dissipation corresponding to each node at the current moment based on the first node-related information and node environmental information at the current moment includes: determining the first solar heat absorption based on a preset solar heat absorption algorithm, according to the solar radiation intensity corresponding to the node, the first node diameter, and a preset heat absorption coefficient; determining the first convective heat dissipation based on a preset convective heat dissipation algorithm, according to the wind speed, wind direction angle, ambient temperature, first node temperature, first node diameter, and a preset convective heat dissipation coefficient corresponding to the node; and determining the first radiative heat dissipation based on a preset radiative heat dissipation algorithm, according to the ambient temperature, first node temperature, first node diameter, and a preset radiative heat dissipation coefficient corresponding to the node.

[0055] It can be understood that the preset solar heat absorption algorithm is a pre-determined algorithm for calculating solar heat absorption. The preset convection heat dissipation algorithm is a pre-determined algorithm for calculating convection heat dissipation. The preset radiation heat dissipation algorithm is a pre-determined algorithm for calculating radiation heat dissipation. The preset heat absorption coefficient is a pre-set heat absorption coefficient, usually a constant, for example, a value of 0.9. The preset convection heat dissipation coefficient is a pre-set convection heat dissipation coefficient. The preset radiation heat dissipation coefficient is a pre-set radiation heat dissipation coefficient.

[0056] Specifically, the preset solar heat absorption algorithm may include the following formula (1):

[0057] Q s.k =αDS formula (1)

[0058] Where α is the preset heat absorption coefficient, D is the node diameter, S is the solar radiation intensity, and Q is the solar radiation intensity. s.k To absorb heat from sunlight, Q s.k It absorbs heat from sunlight.

[0059] The preset convection heat dissipation algorithm can include the following formula (2):

[0060]

[0061] Among them, T c.k For node temperature, T a.k For ambient temperature, V is the wind direction angle. w.k Let D be the wind speed, D be the node diameter, and k be the k-th node diameter. f μ is the heat transfer coefficient. f The viscosity is dynamic, and A, B, C, n, and p are preset heat dissipation coefficients, where k is the dynamic viscosity. f =2.42×10 -2 +3.5×10-5 (T c.k +T a.k ), μ f =1.32×10 -5 +4.8×10 -8 (T c.k +T a.k A can be a constant, such as 0.42, while B and n are usually determined by the wind direction angle. The size is determined, for example, when When n = 2.08, B = 0.68; when At that time, n = 0.9 and B = 0.58. Re is the Reynolds coefficient, usually a constant. C and p are generally determined by the magnitude of the Reynolds coefficient Re. For example, when 100 ≤ Re ≤ 3000, C = 0.57, p = 0.485; when 3000 ≤ Re ≤ 50000, C = 0.094, p = 0.71, Q c.k This refers to convective heat dissipation.

[0062] The preset radiative heat dissipation algorithm may include the following formula (3):

[0063] Q r.k =πεDσ[(T c.k +273) 4 -(T a.k +273) 4 ] Formula (3)

[0064] Where ε is the preset radiative heat dissipation coefficient, a constant, for example, 0.9; σ is the Stefan-Boltzmann constant, a constant, σ = 5.67 × 10⁻⁸ W / (m²·K⁴); T c.k For node temperature, T a.k Where Q is the ambient temperature, D is the node diameter, and Q is the node diameter. r.k This refers to the amount of heat dissipated by radiation.

[0065] Furthermore, the heat balance formula can be:

[0066]

[0067] Among them, i k Let R be the current flowing through node k (the sum of the currents at all nodes within the same cross-section is the injected current), i.e., the equilibrium current at different times corresponding to node k. k (T c.k The node temperature of node k is T. c The resistance value at that time can be obtained by referring to a table based on the temperature. Q s.k To absorb heat from sunlight, Q c.k For convective heat dissipation, Q r.kThis refers to the amount of heat dissipated by radiation.

[0068] In one embodiment, obtaining node-related information and node environment information corresponding to each node includes: obtaining conductor-related information of the damaged conductor and conductor environment information of the environment in which the damaged conductor is located, wherein the conductor-related information includes conductor temperature, and the conductor environment information includes solar radiation intensity, wind speed, wind direction angle and ambient temperature corresponding to the conductor; and determining the node-related information and node environment information corresponding to each node based on the location information of each node on the damaged conductor, the conductor-related information and the conductor environment information.

[0069] It is understandable that conductor-related information refers to information about the conductor itself, which may include its temperature, obtainable through temperature detection equipment. Conductor environmental information refers to the environmental information corresponding to the conductor, including solar radiation intensity, wind speed, wind direction angle, and ambient temperature, which can be obtained through appropriate detection equipment. It is also understandable that after dividing the damaged conductor into nodes using the finite element method, the position information of each node on the damaged conductor can be determined accordingly. For example,

[0070] Specifically, the processor can acquire conductor-related information and conductor-environment information of the environment in which the damaged conductor is located through corresponding detection equipment. The conductor-related information includes conductor temperature, and the conductor-environment information includes solar radiation intensity, wind speed, wind direction angle, and ambient temperature. Based on the position information of each node on the damaged conductor and the conductor-related information, the processor determines the node-related information. For example, at the initial moment, the node temperature of each node can be equal to the conductor temperature. Then, based on the position information of each node on the damaged conductor and the conductor-environment information, the node-environment information corresponding to each node is determined. For example, taking solar radiation intensity as an example, if a node is located on a solar radiation surface, the solar radiation intensity of the node located on the solar radiation surface can be made equal to the solar radiation intensity corresponding to the damaged conductor. If a node is located on a non-solar radiation surface, the solar radiation intensity of the node located on the non-solar radiation surface can be made zero, and so on.

[0071] In one embodiment, the wire-related information also includes the type of wire damage, the state of wire damage, and the internal structure of the wire.

[0072] Understandably, conductor damage can include broken strands, breakage, and a reduction in overall conductor diameter (i.e., thinning). The conductor damage state refers to the specific damage conditions corresponding to different damage forms, and can include the number of broken strands, the location of the damage, or changes in the conductor's cross-sectional area. The internal structure of the conductor can include information such as the number of steel cores, the number of aluminum cores, the diameter of the aluminum cores, the diameter of the steel cores, the pitch ratio, and the rotation angle.

[0073] In a specific embodiment, such as Figures 2 to 5 As shown, a method for determining the current-carrying capacity of a damaged conductor is provided, which may specifically include the following steps:

[0074] (1) Establish a physical model of the damaged conductor, including information such as the number of steel cores, the number of aluminum cores, the diameter of aluminum cores, the diameter of steel cores, the pitch ratio, and the rotation angle.

[0075] (2) Establish a structural model of the damaged conductor, mainly including three forms: broken strands, damage, and thinning of the conductor diameter, among which:

[0076] For cases of stock closures, specify the number and location of the closures;

[0077] For damage cases, that is, the diameter of the sub-strands becomes thinner, and the location of the broken conductor is identified;

[0078] When the overall diameter of a conductor decreases, the change in conductor diameter is achieved by changing the overall cross-sectional area of ​​the conductor.

[0079] (3) Establish a finite element model of the conductor, select the external space range, divide the computational domain space according to the tetrahedral mesh, and establish a finite element computational domain containing n nodes. This model contains conductor information and environmental information. For example, divide the mesh to 0.1mm.

[0080] (4) When a current I is applied to the end face of the conductor, the temperature of the conductor begins to rise. After the current passes through, there is a thermal equilibrium process:

[0081]

[0082] In the formula, Re, A, B, n, C, p, D, ε, and σ are the parameter values ​​specified at the beginning of the model calculation, and i k Q s.k S k k f μ f V w.k Q r.k R k (T c.k ), Parameters such as these need to be calculated based on initial values.

[0083] i k —The current passing through node k, A, and the sum of the currents of all nodes within the same cross-section is the injected current I;

[0084] Q s.k —Sunlight absorption at node k, W / m;

[0085] Among them, Q s.k =αDS;

[0086] In the formula, α is the heat absorption coefficient of the conductor, a constant, taken as 0.9;

[0087] D—Node diameter, in meters, obtained from the conductor type specification;

[0088] S k —Solar radiation intensity at node k, W / m², calculated using a combination of field measurements and finite element vector analysis.

[0089] Q c.k —Convective heat dissipation at node k, W / m;

[0090] in,

[0091] k f =2.42×10 -2 +3.5×10 -5 (T c.k +T a.k )

[0092] μ f =1.32×10 -5 +4.8×10 -8 (T c.k +T a.k )

[0093]

[0094] In the formula, —The wind direction angle at node k, i.e. the angle between the wind speed and the axial direction of the conductor at node k, (°), is calculated by combining the actual measured wind speed vector and the position of the conductor on site;

[0095] k f —The heat transfer coefficient of the air layer on the surface of the conductor, W / (m·℃);

[0096] μ f —Dynamic viscosity of the air layer on the surface of the conductor, m2 / s;

[0097] V w.k —Wind speed at node k perpendicular to the conductor, m / s, combined with the maximum wind speed measured on site. The result;

[0098] Re—Reynolds coefficient, a constant;

[0099] A, B, and n are usually constants, with A being a fixed value of 0.42, and B and n determined by the wind direction angle. When 0 < φ < 24°, n = 2.08 and B = 0.68; when 24° < φ < 90°, n = 0.9 and B = 0.58.

[0100] C and p are usually constants and are taken as fixed values. Considering that the conductor is a fine stranded wire facing the wind, when 100≤Re≤3000, C=0.57, p=0.485; when 3000≤Re≤50000, C=0.094, p=0.71.

[0101] Q r.k —Radiative heat dissipation at node k, W / m,

[0102] Among them, Q r.k =πεDσ[(T c.k +273) 4 -(T a.k +273) 4 ]

[0103] In the formula, D is the node diameter in meters, which can be obtained based on the conductor type parameters.

[0104] ε—radiation coefficient of the conductor, a constant, with a value of 0.9;

[0105] σ—Stephen-Boltzmann constant, a constant, σ=5.67×10-8W / (m2·K4);

[0106] T a.k —Ambient temperature at node k, in °C;

[0107] T c.k —Temperature of the conductor at node k, in °C;

[0108] R k (T c.k —The temperature of the conductor at node k is T c The AC resistance value, in Ω, is obtained by referring to a table based on the temperature.

[0109] (5) After calculation, the current i at each node has been obtained. k For any node k, after time Δt, the conductor will experience a temperature rise due to internal heating followed by resistance heating. The temperature of each node after this temperature rise, Tc.k.t+Δ, is calculated as follows:

[0110] T a.k.t+△ =Q R.k / C p

[0111] Among them, Q R.k Let be the heat generated at node k in time Δt, and be... C p This represents the specific heat capacity of the corresponding material, which is a constant.

[0112] (6) At time t+Δt, there is a thermal equilibrium process for node k, where the T calculated at time t+Δt is required. a.k.t+△ Ta.k φ k V w.k S k Considering that the environmental conditions will not change in a short period of time, T a.k , φk, V w.k S k Keep it unchanged and substitute it into step (4) for calculation.

[0113] (7) Repeat step 5. If the difference between time t2 and time t1 at all nodes is less than 0.1%, it is considered that thermal equilibrium has been reached, that is:

[0114] (T c.t2.k -T c.t1.k ) / T c.t1.k ≤0.1%

[0115] (I t2.k -I t1.k ) / (I t1.k <0.1%

[0116] (8) For the injected current I, the temperature T of all node conductors c.k It should be less than or equal to the maximum allowable design temperature T of the conductor. c.设计 If T c.k <T c.设计 If T increases, then increase the injection current I; c.k >T c.设计 Then reduce the injected current I until the temperature T of all node wires is reached. c.k With respect to the maximum allowable temperature T of the conductor design c.设计 If the deviation is less than 0.1%, the current I is considered to be the load capacity under the condition.

[0117] (9) Calculate the load-bearing limits of conductors under three types of damage, typical damage conditions, typical conductor models, and typical meteorological conditions, and form a lookup table of the load-bearing limits of damaged conductors.

[0118] The above technical solution, based on the principle of thermal balance, establishes a physical model of the conductor, numerically simulates the conductor's heating and cooling processes, and uses the finite element method for iterative calculation to accurately calculate the load-bearing limit of the damaged conductor. Compared with traditional calculation methods, this method considers the load-bearing limit of the conductor under damaged conditions, thus overcoming the limitation of ordinary methods in calculating the load-bearing limit of damaged conductors, and has significant engineering implications.

[0119] Another specific embodiment of the present invention provides a method for determining the current-carrying capacity of a damaged conductor. In this embodiment, the load-bearing limit of an LGJ-300 / 40 conductor with two broken aluminum strands is selected for finite element modeling and simulation study to realize the calculation of the load-bearing limit of the damaged LGJ-300 / 40 conductor. Specifically, the method includes the following steps:

[0120] Step 1: Establish the LGJ-300 / 40 finite element model, considering the cross-sectional area, resistivity, pitch ratio, and torsion angle of the 24 aluminum wires and 7 steel wires, with one aluminum wire broken and missing. Figure 2 As shown.

[0121] Step 2: Divide the finite element calculation mesh. Use a self-tetrahedral mesh to mesh the geometric model. The mesh is refined inside the conductor and on the surface, and appropriately sparsed in the environment domain to improve the overall calculation accuracy and speed.

[0122] Step 3: Select an appropriate current I to inject at the end and begin the calculation.

[0123] Step 4: After obtaining the steady-state results, read the highest temperature T at the conductor node. The deviation between temperature T and the conductor design temperature of 70℃ should be less than 0.1%. If this is not met, the adjustment current I should be recalculated.

[0124] Step 5: After multiple calculations, the current I is obtained. The deviation between the highest temperature T of the conductor node and the design temperature of 70℃ should be less than 0.1%. This current is considered to be the load capacity under this environmental condition.

[0125] In summary, the technical solution provided by this invention, based on the principle of thermal balance, establishes a physical model of the conductor, numerically simulates the heating and cooling of the conductor, and iteratively calculates the load-bearing limit of the damaged conductor using the finite element method. Compared with traditional calculation methods, this method considers conductor damage and is more consistent with actual operating conditions. This method has the advantages of comprehensive consideration and high practicality.

[0126] This invention provides a processor configured to execute a method for determining the current-carrying capacity of a damaged conductor according to the above embodiments.

[0127] like Figure 6 As shown, this embodiment of the invention provides a device 600 for determining the current-carrying capacity of a damaged conductor, comprising:

[0128] The node partitioning module 610 is used to partition the damaged conductor into nodes using the finite element method, so as to obtain multiple nodes corresponding to the damaged conductor.

[0129] The node information acquisition module 620 is used to acquire the node-related information and node environmental information corresponding to each node. The node-related information includes the node temperature, and the node environmental information includes the solar radiation intensity, wind speed, wind direction angle and ambient temperature corresponding to the node.

[0130] The steady-state temperature determination module 630 is used to inject current into the damaged conductor and determine the steady-state temperature of each node when it reaches thermal equilibrium, based on node-related information and node environmental information.

[0131] The current-carrying capacity determination module 640 is used to adjust the injected current of the damaged conductor based on the steady-state temperature of the node and the preset conductor temperature threshold, so as to obtain the maximum current that the damaged conductor can withstand.

[0132] The aforementioned device for determining the current-carrying capacity of a damaged conductor uses the finite element method to divide the damaged conductor into nodes. After injecting current into the damaged conductor, it determines the steady-state temperature of each node when thermal equilibrium is reached based on node-related information and environmental information. Then, based on the node steady-state temperature and a preset conductor temperature threshold, the injected current into the damaged conductor is adjusted to obtain the maximum current that the damaged conductor can withstand. This device overcomes the shortcomings of existing technologies in determining the current-carrying capacity of damaged conductors. By dividing the damaged conductor into nodes using the finite element method, it considers the conductor damage and determines the node steady-state temperature at thermal equilibrium based on the temperature and environmental information of each node. The load-bearing limit of the damaged conductor is then determined based on the node steady-state temperature and a preset conductor temperature threshold, improving the accuracy of the current-carrying capacity results and better reflecting actual operating conditions. It has advantages such as comprehensive consideration and high practicality.

[0133] In one embodiment, the steady-state temperature determination module 630 is further configured to: determine the first solar radiation absorption, first convective heat dissipation, and first radiative heat dissipation of each node at the current moment based on the first node-related information and node environment information corresponding to each node at the current moment; determine the first equilibrium current corresponding to each node when it reaches thermal equilibrium at the current moment based on the first solar radiation absorption, first convective heat dissipation, first radiative heat dissipation, and first node-related information; determine the second solar radiation absorption at the next moment based on the first equilibrium current, first node-related information, and a preset time interval; and determine the second solar radiation absorption at the next moment based on the second node-related information and node environment information. Heat, second convective heat dissipation, and second radiative heat dissipation; based on the second solar heat absorption, second convective heat dissipation, second radiative heat dissipation, and relevant information about the second node, determine the second equilibrium current corresponding to the node when it reaches thermal equilibrium at the next moment; determine the node current change rate corresponding to each node based on the first equilibrium current and the second equilibrium current, and determine the node temperature change rate corresponding to each node based on relevant information about the first node and the second node; if the node current change rate corresponding to each node is within the preset current change rate range and the node temperature change rate corresponding to each node is within the preset temperature change rate range, determine the second node temperature in the relevant information about the second node as the node steady-state temperature.

[0134] In one embodiment, the current-carrying capacity determination module 640 is further configured to: increase the injected current of the damaged conductor when the steady-state temperature of a node corresponding to a node is less than a preset conductor temperature threshold, until the difference between the steady-state temperature of each node and the preset conductor temperature threshold is within a preset temperature deviation range, and determine that the current injected into the damaged conductor is the maximum current that it can withstand; and decrease the injected current of the damaged conductor when the steady-state temperature of a node corresponding to a node is greater than the preset conductor temperature threshold, until the difference between the steady-state temperature of each node and the preset conductor temperature threshold is within a preset temperature deviation range, and determine that the current injected into the damaged conductor is the maximum current that it can withstand.

[0135] In one embodiment, the first node-related information further includes the first node resistance; the steady-state temperature determination module 630 is further configured to: determine the first node resistance based on the pre-stored correspondence between resistance and temperature, according to the first node temperature in the first node-related information; determine the sum of the first convective heat dissipation and the first radiative heat dissipation to obtain the first total heat dissipation; determine the difference between the first total heat dissipation and the first solar radiation heat absorption to obtain the first resistance heat generation; and determine the first balance current based on the first resistance heat generation and the first node resistance.

[0136] In one embodiment, the first node-related information further includes the first node resistance; the steady-state temperature determination module 630 is further configured to: determine the first node resistance based on the pre-stored correspondence between resistance and temperature, according to the first node temperature in the first node-related information; determine the heat generated by the node within the preset time interval based on the first balance current, the first node resistance, and the preset time interval; and determine the second node temperature in the second node-related information based on the heat generated and the preset specific heat capacity.

[0137] In one embodiment, the information related to the first node also includes the diameter of the first node corresponding to the node; the steady-state temperature determination module 630 is further configured to: determine the first solar heat absorption based on a preset solar heat absorption algorithm, according to the solar radiation intensity corresponding to the node, the diameter of the first node, and a preset heat absorption coefficient; determine the first convective heat dissipation based on a preset convective heat dissipation algorithm, according to the wind speed, wind direction angle, ambient temperature, the temperature of the first node, the diameter of the first node, and a preset convective heat dissipation coefficient; and determine the first radiative heat dissipation based on a preset radiative heat dissipation algorithm, according to the ambient temperature, the temperature of the first node, the diameter of the first node, and a preset radiative heat dissipation coefficient.

[0138] In one embodiment, the node information acquisition module 620 is further configured to: acquire conductor-related information of the damaged conductor and conductor environment information of the environment in which the damaged conductor is located, wherein the conductor-related information includes conductor temperature, and the conductor environment information includes solar radiation intensity, wind speed, wind direction angle and ambient temperature corresponding to the conductor; and determine the node-related information and node environment information corresponding to each node based on the location information of each node on the damaged conductor, the conductor-related information and the conductor environment information.

[0139] This invention also provides a machine-readable storage medium storing a program or instructions that, when executed by a processor, implement the method for determining the current-carrying capacity of a damaged conductor according to the above embodiments.

[0140] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0141] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0142] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0143] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0144] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0145] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0146] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0147] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0148] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for determining the current-carrying capacity of a damaged conductor, characterized in that, The method includes: The damaged conductor is divided into nodes using the finite element method to obtain multiple nodes corresponding to the damaged conductor. Obtain node-related information and node environment information corresponding to each node, wherein the node-related information includes node temperature, and the node environment information includes solar radiation intensity, wind speed, wind direction angle and ambient temperature corresponding to the node; Inject current into the damaged conductor, and determine the steady-state temperature of each node when it reaches thermal equilibrium based on the node-related information and the node environment information. Based on the steady-state temperature of the node and the preset conductor temperature threshold, the injected current of the damaged conductor is adjusted to obtain the maximum current that the damaged conductor can withstand. The step of determining the steady-state temperature of each node when it reaches thermal equilibrium, based on the node-related information and the node environment information, includes: Based on the first node-related information and the node environment information corresponding to each node at the current time, determine the first solar heat absorption, first convective heat dissipation and first radiative heat dissipation of each node at the current time. Based on the first solar heat absorption, the first convective heat dissipation, the first radiative heat dissipation, and the first node-related information, determine the first equilibrium current corresponding to each node when it reaches thermal equilibrium at the current moment. The second node information corresponding to each node at the next moment is determined based on the first balanced current, the first node information, and the preset time interval. Based on the relevant information of the second node and the environmental information of the node, determine the second solar heat absorption, the second convective heat dissipation, and the second radiative heat dissipation of each node at the next moment; Based on the second solar heat absorption, the second convective heat dissipation, the second radiative heat dissipation, and the relevant information of the second node, determine the second equilibrium current corresponding to the node when it reaches thermal equilibrium at the next moment; The node current change rate corresponding to each node is determined based on the first balance current and the second balance current, and the node temperature change rate corresponding to each node is determined based on the first node-related information and the second node-related information. When the node current change rate corresponding to each node is within a preset current change rate range and the node temperature change rate corresponding to each node is within a preset temperature change rate range, the second node temperature in the second node related information is determined to be the node steady-state temperature.

2. The method according to claim 1, characterized in that, The step of adjusting the injected current of the damaged conductor based on the steady-state temperature of the node and a preset conductor temperature threshold to obtain the maximum current that the damaged conductor can withstand includes: If the steady-state temperature of the node corresponding to the node is less than the preset conductor temperature threshold, increase the injected current of the damaged conductor until the difference between the steady-state temperature of the node corresponding to each node and the preset conductor temperature threshold is within the preset temperature deviation range, and determine that the current injected into the damaged conductor is the maximum withstand current. If the steady-state temperature of the node corresponding to the node is greater than the preset conductor temperature threshold, the injected current of the damaged conductor is reduced until the difference between the steady-state temperature of the node corresponding to each node and the preset conductor temperature threshold is within the preset temperature deviation range, and the current injected into the damaged conductor is determined to be the maximum withstand current.

3. The method according to claim 1, characterized in that, The first node-related information also includes the first node resistance; the step of determining the first equilibrium current corresponding to each node when it reaches thermal equilibrium at the current moment based on the first solar heat absorption, the first convective heat dissipation, the first radiative heat dissipation, and the first node-related information includes: Based on the pre-stored correspondence between resistance and temperature, the resistance of the first node is determined according to the first node temperature in the relevant information of the first node. Determine the sum of the first convective heat dissipation and the first radiative heat dissipation to obtain the first total heat dissipation; The difference between the first total heat dissipation and the first solar heat absorption is determined to obtain the first resistive heat generation; The first balancing current is determined based on the heat generated by the first resistor and the resistance of the first node.

4. The method according to claim 1, characterized in that, The first node-related information also includes the first node resistance; the step of determining the second node-related information corresponding to each node at the next moment based on the first balanced current, the first node-related information, and a preset time interval includes: Based on the pre-stored correspondence between resistance and temperature, the resistance of the first node is determined according to the first node temperature in the relevant information of the first node. The heat generated by the node within the preset time interval is determined based on the first balanced current, the first node resistance, and the preset time interval. The temperature of the second node in the relevant information of the second node is determined based on the heat generation and the preset specific heat capacity.

5. The method according to claim 1, characterized in that, The first node-related information also includes the first node diameter corresponding to the node; the step of determining the first solar radiation absorption, first convective heat dissipation, and first radiative heat dissipation of each node at the current time based on the first node-related information and the node environment information at the current time includes: Based on a preset solar heat absorption algorithm, the first solar heat absorption is determined according to the solar radiation intensity corresponding to the node, the diameter of the first node, and the preset heat absorption coefficient. Based on a preset convection heat dissipation algorithm, the first convection heat dissipation is determined according to the wind speed, wind direction angle, ambient temperature, first node temperature, first node diameter and preset convection heat dissipation coefficient corresponding to the node. Based on a preset radiation heat dissipation algorithm, the first radiation heat dissipation is determined according to the ambient temperature of the node, the temperature of the first node, the diameter of the first node, and the preset radiation heat dissipation coefficient.

6. The method according to claim 1, characterized in that, The process of obtaining the node-related information and node environment information corresponding to each node includes: Obtain conductor-related information and conductor-environment information of the environment in which the damaged conductor is located. The conductor-related information includes conductor temperature, and the conductor-environment information includes solar radiation intensity, wind speed, wind direction angle, and ambient temperature corresponding to the conductor. Based on the location information of each node on the damaged conductor, the conductor-related information, and the conductor environment information, the node-related information and node environment information corresponding to each node are determined.

7. A device for determining the current-carrying capacity of a damaged conductor, characterized in that, include: The node division module is used to divide the damaged conductor into nodes using the finite element method to obtain multiple nodes corresponding to the damaged conductor. The node information acquisition module is used to acquire node-related information and node environmental information corresponding to each node. The node-related information includes node temperature, and the node environmental information includes solar radiation intensity, wind speed, wind direction angle and ambient temperature corresponding to the node. The steady-state temperature determination module is used to inject current into the damaged conductor and determine the steady-state temperature of each node when it reaches thermal equilibrium based on the node-related information and the node environment information. The current-carrying capacity determination module is used to adjust the injected current of the damaged conductor according to the steady-state temperature of the node and the preset conductor temperature threshold, so as to obtain the maximum current that the damaged conductor can withstand. The step of determining the steady-state temperature of each node when it reaches thermal equilibrium, based on the node-related information and the node environment information, includes: Based on the first node-related information and the node environment information corresponding to each node at the current time, determine the first solar heat absorption, first convective heat dissipation and first radiative heat dissipation of each node at the current time. Based on the first solar heat absorption, the first convective heat dissipation, the first radiative heat dissipation, and the first node-related information, determine the first equilibrium current corresponding to each node when it reaches thermal equilibrium at the current moment. The second node information corresponding to each node at the next moment is determined based on the first balanced current, the first node information, and the preset time interval. Based on the relevant information of the second node and the environmental information of the node, determine the second solar heat absorption, the second convective heat dissipation, and the second radiative heat dissipation of each node at the next moment; Based on the second solar heat absorption, the second convective heat dissipation, the second radiative heat dissipation, and the relevant information of the second node, determine the second equilibrium current corresponding to the node when it reaches thermal equilibrium at the next moment; The node current change rate corresponding to each node is determined based on the first balance current and the second balance current, and the node temperature change rate corresponding to each node is determined based on the first node-related information and the second node-related information. When the node current change rate corresponding to each node is within a preset current change rate range and the node temperature change rate corresponding to each node is within a preset temperature change rate range, the second node temperature in the second node related information is determined to be the node steady-state temperature.

8. A machine-readable storage medium on which a program or instructions are stored, characterized in that, When the program or the instructions are executed by the processor, they implement the method for determining the current-carrying capacity of a damaged conductor according to any one of claims 1 to 6.

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