Method, device and equipment for predicting maximum current-carrying capacity of line under forest fire condition and medium

Abstract

The application discloses a method, device, equipment and medium for predicting the maximum current-carrying capacity of a line under a mountain fire condition, and the method comprises the following steps: calculating the line temperature of each fire point section according to the temperature of each environmental fire source and the unaffected line operating temperature; calculating the average temperature of the line according to the line temperature of each fire point section, the unaffected line operating temperature, the unaffected line length and the horizontal length of the line of different fire point sections; calculating the maximum sag of the line according to the average temperature of the line, the unaffected line operating temperature and the height difference angle of the line suspension point; and calculating the maximum current-carrying capacity of the line under the mountain fire condition according to the line model parameter, the line working voltage and the maximum sag of the line. By using the application, the maximum current-carrying capacity of the line under the mountain fire condition can be quickly calculated with few parameters under the condition of considering the influence of high temperature of the flame on the sag of the line.

Description

Technical Field

[0001] This invention relates to the field of wildfire power line measurement, and in particular to a method, apparatus, equipment and medium for predicting the maximum current carrying capacity of power lines under wildfire conditions. Background Technology

[0002] my country's energy centers and load centers exhibit an inverse distribution. To address the challenge of long-distance power transmission, large-capacity, long-distance transmission lines are necessary. These long-distance overhead transmission lines inevitably traverse forests, grasslands, or mountainous regions. When vegetation beneath these lines catch fire, the high temperatures of the flames reduce air density. Furthermore, the charged particles, alkali metals, alkaline earth metals, and ash particles produced by the burning vegetation can increase the conductor's conductivity relative to the ground, potentially leading to line tripping and jeopardizing the safe operation of the power grid. Therefore, calculating the maximum current-carrying capacity of overhead transmission lines under wildfire conditions is a crucial means of minimizing the damage to electrical loads caused by wildfires while ensuring grid safety.

[0003] Existing methods for calculating the current-carrying capacity of overhead transmission line conductors include the finite element method, methods in IEEE and CIGRE standards, and the method in my country's GB 50545-2010 "Design Code for 110kV~750kV Overhead Transmission Lines". However, existing methods are only applicable to the current-carrying capacity calculation under the conductor's operating condition, and do not consider the impact of high temperature and insulation failure risk under wildfire conditions on the current-carrying capacity of transmission lines. Furthermore, the required thermal balance parameters are difficult to measure under wildfire conditions, resulting in long calculation times. Summary of the Invention

[0004] This invention provides a method, apparatus, equipment, and medium for predicting the maximum current carrying capacity of power lines under wildfire conditions. It can quickly calculate the maximum current carrying capacity of power lines under wildfire conditions by obtaining a small number of parameters, while considering the influence of high flame temperature on conductor sag.

[0005] To achieve the above objectives, a first aspect of this application provides a method for predicting the maximum load capacity of power lines under wildfire conditions, comprising:

[0006] Based on the influence distance of each environmental fire source within the target span and the distance between each environmental fire source and each point on the conductor, multiple fire point segments are obtained; the sum of the length of each fire point segment and the length of the unaffected conductor is equal to the length of the conductor within the span.

[0007] Obtain the ambient fire source temperature, unaffected conductor operating temperature, horizontal conductor length at different fire points, unaffected conductor length, vertical distance between conductor and wildfire source, and conductor operating voltage within the target span.

[0008] Calculate the conductor temperature of each fire point segment based on the ambient fire source temperature and the unaffected conductor operating temperature.

[0009] The average temperature of the conductor is calculated based on the conductor temperature of each fire point segment, the operating temperature of the unaffected conductor, the length of the unaffected conductor, and the horizontal length of the conductor in different fire point segments.

[0010] The maximum sag of the conductor is calculated based on the average temperature of the conductor, the operating temperature of the unaffected conductor, and the height difference angle of the conductor suspension point.

[0011] Calculate the maximum current carrying capacity of the conductor under wildfire conditions based on the conductor type parameters, the conductor's operating voltage, and the conductor's maximum sag.

[0012] In one possible implementation of the first aspect, the division into multiple fire point segments based on the influence distance of each environmental fire source within the target span and the distance between each environmental fire source and each point on the conductor specifically includes:

[0013] Within the target span, for each environmental fire source, the conductor points whose distance from the environmental fire source is less than or equal to the influence distance of the environmental fire source are divided into a fire point segment.

[0014] In one possible implementation of the first aspect, the acquisition of the ambient fire source temperature, the unaffected conductor operating temperature, the horizontal length of the conductor at different fire points, the unaffected conductor length, the vertical distance between the conductor and the wildfire source, and the conductor operating voltage within the target span specifically includes:

[0015] The infrared camera collects the temperature of various ambient fire sources within the target range and the operating temperature of unaffected conductors. The visible light camera uses photos to calculate the horizontal length of conductors at different fire points, the length of unaffected conductors, and the vertical distance between conductors and wildfire sources. The overvoltage sensor collects the operating voltage of the conductors.

[0016] In one possible implementation of the first aspect, calculating the conductor temperature of each fire point segment based on the ambient fire source temperature and the unaffected conductor operating temperature specifically includes:

[0017] According to the temperature T of each environmental fire source h and the unaffected conductor operating temperature T c Calculate the conductor temperature T for each fire point segment using the following formula. p :

[0018]

[0019] In the formula, Q is the heat release rate of the wildfire, in W / m³. 2 ;f(T h) represents Q and T h The fitting relationship between them was obtained through preliminary simulation experiments; t f The estimated duration of the wildfire beneath the power line is given in seconds (s); m is the mass of the power line in grams (g); c is the specific heat capacity of aluminum in J / (kg·℃); L c This represents the vertical distance between the conductor and the source of the wildfire.

[0020] In one possible implementation of the first aspect, calculating the average temperature of the conductor based on the conductor temperature of each fire point segment, the operating temperature of the unaffected conductor, the length of the unaffected conductor, and the horizontal length of the conductor in different fire point segments specifically includes:

[0021] Average conductor temperature T a The calculation method is as follows:

[0022]

[0023] In the formula, L p T represents the length of the conductor that is unaffected within the span, in meters; L represents the length of this span segment, in meters; T p1 ~T pn The conductor temperatures of the nth fire segment are L and L respectively. s1 ~L sn Let L and L be the lengths of the conductors in the nth fire segment, respectively, and L = L p +L s1 +……L sn .

[0024] In one possible implementation of the first aspect, calculating the maximum sag of the conductor based on the average temperature of the conductor, the operating temperature of the unaffected conductor, and the elevation difference angle of the conductor suspension point specifically includes:

[0025]

[0026] In the formula, H is the maximum sag of the conductor, in meters; f0 is the design sag, in meters; and φ is the elevation difference angle of the conductor suspension point, in degrees.

[0027] In one possible implementation of the first aspect, calculating the maximum current-carrying capacity of the conductor under wildfire conditions based on the conductor type parameters, the conductor operating voltage, and the conductor maximum sag specifically includes:

[0028] Calculate the DC resistance and AC resistance of the conductor based on the conductor type parameters;

[0029] Calculate the conductor breakdown voltage U under wildfire conditions based on the conductor type parameters, the conductor's operating voltage, and the conductor's maximum sag H. b .

[0030] A second aspect of this application provides a device for predicting the maximum load capacity of power lines under wildfire conditions, comprising:

[0031] The segmentation module is used to divide the target span into multiple fire point segments based on the influence distance of each environmental fire source and the distance between each environmental fire source and each point on the conductor; the sum of the length of each fire point segment and the length of the unaffected conductor is equal to the length of the conductor within the span.

[0032] The acquisition module is used to acquire the ambient fire source temperature, unaffected conductor operating temperature, horizontal conductor length of different fire point segments, unaffected conductor length, vertical distance between conductor and wildfire source, and conductor operating voltage within the target span.

[0033] The first calculation module is used to calculate the conductor temperature of each fire point segment based on the temperature of each ambient fire source and the operating temperature of the unaffected conductor.

[0034] The second calculation module is used to calculate the average temperature of the conductor based on the conductor temperature of each fire point segment, the operating temperature of the unaffected conductor, the length of the unaffected conductor, and the horizontal length of the conductor in different fire point segments.

[0035] The third calculation module is used to calculate the maximum sag of the conductor based on the average temperature of the conductor, the operating temperature of the unaffected conductor, and the height difference angle of the conductor suspension point.

[0036] The current carrying capacity calculation module is used to calculate the maximum current carrying capacity of the conductor under wildfire conditions based on the conductor type parameters, the conductor's operating voltage, and the conductor's maximum sag.

[0037] A third aspect of this application provides a terminal device including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the method for predicting the maximum line carrying capacity under wildfire conditions as described above.

[0038] A third aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for predicting the maximum line carrying capacity under wildfire conditions as described above.

[0039] Compared to existing technologies, this invention provides a method, apparatus, equipment, and medium for predicting the maximum current carrying capacity of power lines under wildfire conditions. Based on the flame parameters (temperatures of various ambient fire sources) of each wildfire within the span of the transmission line and the parameters of the overhead transmission line, the average temperature of the conductors affected by the wildfire in each fire segment is calculated. Then, the AC resistance of the conductors under the high temperature of the wildfire is calculated, thereby calculating the maximum current carrying capacity of the conductors under wildfire conditions. Since the influence of the high temperature of the flame on the conductor sag is considered in the calculation, the risk of conductor insulation failure discharge can be estimated based on this calculation result, thereby increasing the reliability of power grid operation under wildfire conditions. Attached Figure Description

[0040] Figure 1 This is a flowchart illustrating a method for predicting the maximum carrying capacity of a power line under wildfire conditions, according to an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram of the structure of a power line maximum load-carrying capacity prediction device under wildfire conditions, provided by an embodiment of the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figure 1 An embodiment of the present invention provides a method for predicting the maximum carrying capacity of power lines under wildfire conditions, comprising:

[0044] S10. Based on the influence distance of each environmental fire source within the target span and the distance between each environmental fire source and each point on the conductor, multiple fire point segments are obtained; the sum of the length of each fire point segment and the length of the unaffected conductor is equal to the length of the conductor within the span.

[0045] S11. Obtain the ambient fire source temperature, unaffected conductor operating temperature, horizontal conductor length at different fire points, unaffected conductor length, vertical distance between conductor and wildfire source, and conductor operating voltage within the target span.

[0046] S12. Calculate the conductor temperature of each fire point segment based on the ambient fire source temperature and the unaffected conductor operating temperature.

[0047] S13. Calculate the average temperature of the conductor based on the conductor temperature of each fire point segment, the operating temperature of the unaffected conductor, the length of the unaffected conductor, and the horizontal length of the conductor in different fire point segments.

[0048] S14. Calculate the maximum sag of the conductor based on the average temperature of the conductor, the operating temperature of the unaffected conductor, and the height difference angle of the conductor suspension point.

[0049] S15. Calculate the maximum current carrying capacity of the conductor under wildfire conditions based on the conductor type parameters, the conductor operating voltage, and the conductor maximum sag.

[0050] S10 is a necessary preparatory step before measurement, dividing the conductor within the target span into multiple fire point segments. S11 involves acquiring the necessary data for measurement, including six parameters: the ambient fire source temperature within the target span, the operating temperature of unaffected conductors, the horizontal length of conductors in different fire point segments, the length of unaffected conductors, the vertical distance between the conductor and the wildfire source, and the conductor's operating voltage. S13-S16 process these six parameters using a preset algorithm (S13-S16 are essentially algorithmic processing steps for the above six data points), ultimately obtaining the maximum current-carrying capacity of the conductor under wildfire conditions. It is important to note that the maximum conductor sag in S14 significantly affects the maximum current-carrying capacity value of the conductor, serving as a calculation indicator.

[0051] This embodiment provides a method for predicting the maximum current carrying capacity of overhead transmission line conductors under wildfire conditions. Compared with existing technologies, it has the following advantages: it realizes the prediction of the maximum current carrying capacity of overhead transmission line conductors under wildfire conditions, minimizing the impact on the transmission load of the line while ensuring the safe operation of the power grid; it requires relatively few conductor and flame parameters when calculating the current carrying capacity, and the calculation method is simple, enabling rapid calculation when wildfires occur, avoiding the problem of difficult parameter acquisition in traditional methods; it considers the influence of uneven temperature rise of conductors caused by high temperatures during wildfires, and uses conductor sag to calculate the transmission line gap breakdown voltage under wildfire conditions, reducing the risk of insulation failure and tripping accidents caused by wildfires.

[0052] For example, the step of dividing the target span into multiple fire point segments based on the influence distance of each environmental fire source and the distance between each environmental fire source and each point on the conductor specifically includes:

[0053] Within the target span, for each environmental fire source, the conductor points whose distance from the environmental fire source is less than or equal to the influence distance of the environmental fire source are divided into a fire point segment.

[0054] For example, obtaining the ambient fire source temperature, unaffected conductor operating temperature, horizontal conductor length at different fire points, unaffected conductor length, vertical distance between the conductor and the wildfire source, and conductor operating voltage within the target span specifically includes:

[0055] The infrared camera collects the temperature of various ambient fire sources within the target range and the operating temperature of unaffected conductors. The visible light camera uses photos to calculate the horizontal length of conductors at different fire points, the length of unaffected conductors, and the vertical distance between conductors and wildfire sources. The overvoltage sensor collects the operating voltage of the conductors.

[0056] For example, the step of calculating the conductor temperature of each fire point segment based on the ambient fire source temperature and the unaffected conductor operating temperature specifically includes:

[0057] According to the temperature T of each environmental fire source h and the unaffected conductor operating temperature T c Calculate the conductor temperature T of each fire point segment using the following formula. p :

[0058]

[0059] In the formula, Q is the heat release rate of the wildfire, in W / m³. 2 ;f(T h ) represents Q and T h The fitting relationship between them was obtained through preliminary simulation experiments; t f The estimated duration of the wildfire beneath the power line is given in seconds (s); m is the mass of the power line in grams (g); c is the specific heat capacity of aluminum in J / (kg·℃); L c This represents the vertical distance between the conductor and the source of the wildfire.

[0060] For example, calculating the average temperature of the conductor based on the conductor temperature of each fire point segment, the operating temperature of the unaffected conductor, the length of the unaffected conductor, and the horizontal length of the conductor in different fire point segments specifically includes:

[0061] Average conductor temperature T a The calculation method is as follows:

[0062]

[0063] In the formula, L p T represents the length of the conductor that is unaffected within the span, in meters; L represents the length of this span segment, in meters; T p1 ~T pn The conductor temperatures of the nth fire segment are L and L respectively. s1 ~L sn Let L and L be the lengths of the conductors in the nth fire segment, respectively, and L = L p +L s1 +……L sn ;T c The operating temperature of the conductor is unaffected.

[0064] For example, calculating the maximum sag of the conductor based on the average temperature of the conductor, the operating temperature of the unaffected conductor, and the elevation difference angle of the conductor suspension point specifically includes:

[0065]

[0066] In the formula, H is the maximum sag of the conductor, in meters; f0 is the design sag, in meters; and φ is the elevation difference angle of the conductor suspension point, in degrees.

[0067] In summary, in the above embodiments, the ambient fire source temperature T of the conductor within a certain span is first collected by an infrared camera. h and unaffected conductor operating temperature T c The horizontal length L of each fire point segment was calculated using images from a visible light camera. s The vertical distance L between the wildfire and the power line c The operating voltage U of the conductor is collected by a voltage sensor.

[0068] Then according to T h and L c Calculate the conductor temperature T in the area affected by the wildfire. p Based on conductor parameters and the unaffected conductor operating temperature T c and the temperature T of each fire point section of the conductor p Calculate the average temperature T of the conductor. a Based on the conductor type, overhead transmission line parameters, and conductor temperature T of each fire-prone section. p Calculate the maximum sag H of the conductor under wildfire conditions.

[0069] For example, calculating the maximum current-carrying capacity of the conductor under wildfire conditions based on the conductor type parameters, the conductor operating voltage, and the conductor maximum sag specifically includes:

[0070] Calculate the DC resistance and AC resistance of the conductor based on the conductor type parameters;

[0071] Calculate the breakdown voltage of the conductor under wildfire conditions based on the conductor type parameters, the conductor's operating voltage, and the conductor's maximum sag.

[0072] The calculation methods for the DC resistance R and AC resistance R' of a conductor are as follows:

[0073] R = 2.83 × 10 -8 (1+4.2×10 -3 ΔT)L z S.

[0074] R' = 1.18R.

[0075] In the formula, ΔT is the difference between the current temperature of the conductor and its original operating temperature, in °C and L.z S is the length of the conductor within the span, in meters; S is the cross-sectional area of ​​the conductor, in mm. 2 .

[0076] Wire breakdown voltage U b The calculation method is as follows:

[0077] U b =60K(X-(H-f0)).

[0078] In the formula, K is the flame breakdown voltage correction coefficient, which ranges from 1 to 1.5; X is the height of the conductor from the tree crown, in meters.

[0079] Maximum current carrying capacity of conductor I f The calculation method is as follows:

[0080] When T p ≥130℃ or At that time, I f =0, at this time the line cannot operate;

[0081] When T p <130℃ and hour,

[0082] Compared to existing technologies, this invention provides a method for predicting the maximum current carrying capacity of power lines under wildfire conditions. Based on the flame parameters (temperature of each ambient fire source) of each wildfire within the span of the transmission line and the parameters of the overhead transmission line, the average temperature of the conductors affected by the wildfire in each fire point segment is calculated. Then, the AC resistance of the conductors under the high temperature of the wildfire is calculated, thereby calculating the maximum current carrying capacity of the conductors under wildfire conditions. Since the influence of the high temperature of the flame on the conductor sag is considered in the calculation, the risk of conductor insulation failure discharge can be estimated based on this calculation result, thereby increasing the reliability of power grid operation under wildfire conditions.

[0083] One embodiment of this application provides a device for predicting the maximum carrying capacity of a power line under wildfire conditions, comprising: a division module 201, an acquisition module 202, a first calculation module 203, a second calculation module 204, a third calculation module 205, and a carrying capacity calculation module 206.

[0084] The segmentation module 201 is used to divide the target span into multiple fire point segments based on the influence distance of each environmental fire source and the distance between each environmental fire source and each point on the conductor; the sum of the length of each fire point segment and the length of the unaffected conductor is equal to the length of the conductor within the span.

[0085] The acquisition module 202 is used to acquire the ambient fire source temperature, unaffected conductor operating temperature, horizontal conductor length of different fire point segments, unaffected conductor length, vertical distance between conductor and wildfire source, and conductor operating voltage within the target span.

[0086] The first calculation module 203 is used to calculate the conductor temperature of each fire point segment based on the temperature of each ambient fire source and the operating temperature of the unaffected conductor.

[0087] The second calculation module 204 is used to calculate the average temperature of the conductor based on the conductor temperature of each fire point segment, the operating temperature of the unaffected conductor, the length of the unaffected conductor, and the horizontal length of the conductor in different fire point segments.

[0088] The third calculation module 205 is used to calculate the maximum sag of the conductor based on the average temperature of the conductor, the operating temperature of the unaffected conductor, and the height difference angle of the conductor suspension point.

[0089] The current carrying capacity calculation module 206 is used to calculate the maximum current carrying capacity of the conductor under wildfire conditions based on the conductor type parameters, the conductor operating voltage, and the conductor maximum sag.

[0090] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the system described above can be referred to the corresponding process in the foregoing method embodiments, and will not be elaborated upon here.

[0091] Compared to existing technologies, the present invention provides a device for predicting the maximum current carrying capacity of a power line under wildfire conditions. Based on the flame parameters (temperature of each ambient fire source) of each wildfire within the span of the transmission line and the parameters of the overhead transmission line, the device calculates the average temperature of the conductor affected by the wildfire in each fire segment, and then calculates the AC resistance of the conductor under the high temperature of the wildfire. This is used to calculate the maximum current carrying capacity of the conductor under wildfire conditions. Since the influence of the high temperature of the flame on the conductor sag is considered in the calculation, the risk of conductor insulation failure discharge can be estimated based on this calculation result, thereby increasing the reliability of power grid operation under wildfire conditions.

[0092] One embodiment of this application provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the method for predicting the maximum line carrying capacity under wildfire conditions as described above.

[0093] The computer device may be a smartphone, tablet, desktop computer, or cloud server, among other computing devices. This computer device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that the figures are merely examples of computer devices and do not constitute a limitation on the computer device. It may include more or fewer components than illustrated, or a combination of certain components, or different components, such as input / output devices, network access devices, etc.

[0094] The processor referred to can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0095] In some embodiments, the memory may be an internal storage unit of the computer device, such as a hard drive or RAM. In other embodiments, the memory may be an external storage device of the computer device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory may include both internal and external storage units of the computer device. The memory is used to store the operating system, applications, bootloader, data, and other programs, such as the program code of the computer program. The memory can also be used to temporarily store data that has been output or will be output.

[0096] One embodiment of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for predicting the maximum line carrying capacity under wildfire conditions as described above.

[0097] In the several embodiments provided in this application, it will be understood that each block in the flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the figures. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved.

[0098] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0099] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for predicting the maximum carrying capacity of power lines under wildfire conditions, characterized in that, include: Based on the influence distance of each environmental fire source within the target span and the distance between each environmental fire source and each point on the conductor, multiple fire point segments are obtained. The sum of the length of each fire point segment and the length of the unaffected conductor is equal to the length of the conductor within the span. Obtain the ambient fire source temperature, unaffected conductor operating temperature, horizontal conductor length at different fire points, unaffected conductor length, vertical distance between conductor and wildfire source, and conductor operating voltage within the target span. Based on the ambient fire source temperatures and the unaffected conductor operating temperatures, the conductor temperature for each fire point segment is calculated; wherein, based on the ambient fire source temperatures... T h and the unaffected conductor operating temperature T c Calculate the conductor temperature of each fire point segment using the following formula. T p : ； ； In the formula, Q is the heat release rate of the wildfire, in W / m³. 2 ; f ( T h )represent Q and T h The fitting relationship between them was obtained through preliminary simulation experiments; t f The estimated duration of the wildfire below the conductor is given in seconds (s); m is the mass of the conductor in grams (g); and c is the specific heat capacity of aluminum in J / (kg·℃). L c The vertical distance between the conductor and the source of the wildfire; The average temperature of the conductor is calculated based on the conductor temperature of each fire point segment, the operating temperature of the unaffected conductor, the length of the unaffected conductor, and the horizontal length of the conductor in different fire point segments; wherein, the average conductor temperature... T a The calculation method is as follows: ； In the formula, L p The length of the conductor that is not affected within the span, in meters; L This is the length of the span, in meters. T p1 ~ T pn These are the conductor temperatures of the nth fire segment, respectively. L s1 ~L sn Let be the lengths of the conductors in the nth fire segment, and . L = L p + L s1 +…… L sn ; T c The operating temperature of the conductor that is unaffected; The maximum sag of the conductor is calculated based on the average temperature of the conductor, the operating temperature of the unaffected conductor, and the elevation difference angle of the conductor suspension point; specifically, the calculation of the maximum sag includes: ； In the formula H The maximum sag of the conductor is expressed in meters (m). f 0 represents the design sag, in meters (m). φ The elevation difference angle of the conductor suspension point, in degrees; Calculate the maximum current carrying capacity of the conductor under wildfire conditions based on the conductor type parameters, the conductor's operating voltage, and the conductor's maximum sag.

2. The method for predicting the maximum carrying capacity of power lines under wildfire conditions as described in claim 1, characterized in that, The process involves dividing the target span into multiple fire point segments based on the influence distance of each environmental fire source and the distance between each environmental fire source and each point on the conductor. Specifically, these segments include: Within the target span, for each environmental fire source, the conductor points whose distance from the environmental fire source is less than or equal to the influence distance of the environmental fire source are divided into a fire point segment.

3. The method for predicting the maximum carrying capacity of power lines under wildfire conditions as described in claim 1, characterized in that, The acquisition of the ambient fire source temperature, unaffected conductor operating temperature, horizontal conductor length at different fire points, unaffected conductor length, vertical distance between the conductor and the wildfire source, and conductor operating voltage within the target span specifically includes: The infrared camera collects the temperature of various ambient fire sources within the target range and the operating temperature of unaffected conductors. The visible light camera uses photos to calculate the horizontal length of conductors at different fire points, the length of unaffected conductors, and the vertical distance between conductors and wildfire sources. The overvoltage sensor collects the operating voltage of the conductors.

4. The method for predicting the maximum carrying capacity of power lines under wildfire conditions as described in claim 1, characterized in that, The calculation of the maximum current-carrying capacity of the conductor under wildfire conditions, based on the conductor type parameters, the conductor operating voltage, and the conductor maximum sag, specifically includes: Calculate the DC resistance and AC resistance of the conductor based on the conductor type parameters; Calculate the breakdown voltage of the conductor under wildfire conditions based on the conductor type parameters, the conductor's operating voltage, and the conductor's maximum sag.

5. A device for predicting the maximum current carrying capacity of power lines under wildfire conditions, characterized in that, include: The segmentation module is used to divide the target span into multiple fire point segments based on the influence distance of each environmental fire source and the distance between each environmental fire source and each point on the conductor; the sum of the length of each fire point segment and the length of the unaffected conductor is equal to the length of the conductor within the span. The acquisition module is used to acquire the ambient fire source temperature, unaffected conductor operating temperature, horizontal conductor length of different fire point segments, unaffected conductor length, vertical distance between conductor and wildfire source, and conductor operating voltage within the target span. The first calculation module is used to calculate the conductor temperature of each fire point segment based on the ambient fire source temperature and the unaffected conductor operating temperature; wherein, based on the ambient fire source temperature... T h and the unaffected conductor operating temperature T c Calculate the conductor temperature of each fire point segment using the following formula. T p : ； ； In the formula, Q represents the heat release rate of the wildfire, in W / m³. 2 ; f ( T h )represent Q and T h The fitting relationship between them was obtained through preliminary simulation experiments; t f The estimated duration of the wildfire below the conductor is given in seconds (s); m is the mass of the conductor in grams (g); and c is the specific heat capacity of aluminum in J / (kg·℃). L c The vertical distance between the conductor and the source of the wildfire; The second calculation module is used to calculate the average temperature of the conductor based on the conductor temperature of each fire point segment, the operating temperature of the unaffected conductor, the length of the unaffected conductor, and the horizontal length of the conductor in different fire point segments; wherein, the average conductor temperature... T a The calculation method is as follows: ； In the formula, L p The length of the conductor that is not affected within the span, in meters; L This is the length of the span, in meters. T p1 ~ T pn These represent the conductor temperatures of the nth fire segment. L s1 ~L sn Let be the lengths of the conductors in the nth fire segment, and . L = L p + L s1 +…… L sn ; T c The operating temperature of the conductor that is unaffected; The third calculation module is used to calculate the maximum sag of the conductor based on the average temperature of the conductor, the operating temperature of the unaffected conductor, and the elevation difference angle of the conductor suspension point; wherein, calculating the maximum sag of the conductor specifically includes: ； In the formula H The maximum sag of the conductor is expressed in meters (m). f 0 represents the design sag, in meters (m). φ The elevation difference angle of the conductor suspension point, in degrees; The current carrying capacity calculation module is used to calculate the maximum current carrying capacity of the conductor under wildfire conditions based on the conductor type parameters, the conductor's operating voltage, and the conductor's maximum sag.

6. A terminal device, characterized in that, The system includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the method for predicting maximum line carrying capacity under wildfire conditions as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the method for predicting the maximum load capacity of a line under wildfire conditions as described in any one of claims 1 to 4.

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