Conductor sag determination method and device and storage medium

Abstract

The invention discloses a conductor sag determination method and device and a storage medium, and the method comprises the steps: dividing a conductor into a plurality of segments, and determining the size of each segment of conductor after thermal expansion; calculating the equivalent specific load of the wire after thermal expansion according to the wire volume of each section of wire after thermal expansion; determining the horizontal stress after thermal expansion according to the length of the wire after thermal expansion, the span length, the span height and the equivalent specific load of the wire after thermal expansion; and determining the maximum sag of the conductor according to the horizontal stress after thermal expansion. The horizontal stress after thermal expansion is determined according to the wire length after thermal expansion, the span length, the span height and the equivalent specific load of the wire after thermal expansion so as to calculate the sag of the wire, and the sag of the wire can be calculated according to the equivalent specific load of the wire after thermal expansion without adopting a numerical simulation method of finite element simulation to calculate the sag of the wire. Therefore, the operation period can be effectively shortened, and the conductor sag efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sag measurement, and in particular to a method, a device and a storage medium for determining the sag of a conductor. Background Art

[0002] Unlike the uniform temperature rise caused by the thermal effect of the uniformly distributed current load inside the conductor, the local high temperature of the wildfire causes uneven temperature rise at different locations of the conductor, and factors such as the flame heat flux density, flame height, wildfire area, and the position of the wildfire relative to the overhead conductor will further affect the degree of uneven temperature rise of the conductor. The increase in sag in the high temperature area not only leads to a decrease in the line-to-ground clearance distance, which may exceed the safe distance of the conductor to the ground, but also shortens the distance between the conductor and the flame, intensifies the heat conduction of the heat source to the conductor, and further increases the conductor temperature until the maximum sag and temperature field distribution reach a steady state. In severe cases, the flame directly covers the conductor, and the probability of short-circuit breakdown of the transmission line to the ground gap increases sharply, seriously affecting the stable operation of the power system. At the same time, in the process of continuous baking by the high temperature of the wildfire and the continuous increase in sag, the material properties of the conductor undergo irreversible changes, and the fatigue resistance is significantly reduced, which not only reduces the service life of the conductor, but also easily leads to fatigue damage and accidents such as broken strands and scattered strands.

[0003] The existing method for determining conductor sag usually adopts a numerical simulation method of finite element simulation to calculate the conductor sag, which has a long operation cycle and results in low efficiency in determining the conductor sag. Summary of the invention

[0004] The present invention provides a conductor sag determination method, device and storage medium to solve the technical problem that the existing conductor sag determination method uses a numerical simulation method of finite element simulation to calculate the conductor sag, and its operation cycle is long, resulting in low efficiency in conductor sag determination.

[0005] The present invention provides a method for determining conductor sag, comprising:

[0006] Divide the conductor into several sections and determine the conductor volume of each section after thermal expansion;

[0007] The equivalent specific load of the conductor after thermal expansion is calculated based on the conductor volume of each section of the conductor after thermal expansion;

[0008] Determine the horizontal stress after thermal expansion based on the conductor length after thermal expansion, the span length, the span height and the equivalent specific load of the conductor after thermal expansion;

[0009] The maximum sag of the conductor is determined according to the horizontal stress after thermal expansion.

[0010] Furthermore, dividing the conductor into a plurality of sections and determining the conductor volume of each section of the conductor after thermal expansion includes:

[0011] The wire is divided into n sections, and the length of each section of the wire after thermal expansion is calculated based on the linear expansion coefficient of the wire and the initial temperature of each section of the wire;

[0012] According to the length of each section of the wire after thermal expansion, the total length of the wire after thermal expansion is calculated;

[0013] Calculating the total volume of the wire after thermal expansion according to the total length of the wire after thermal expansion, the cross-sectional area of ​​the wire and the volume before thermal expansion;

[0014] The wire volume of each section of the wire after thermal expansion is calculated according to the total volume of the wire after thermal expansion.

[0015] Furthermore, the equivalent specific load of the conductor after thermal expansion is calculated based on the conductor volume of each section of the conductor after thermal expansion, including:

[0016] Based on the mass conservation of the wire before and after the thermal expansion, the equivalent specific load of the wire after the thermal expansion is determined according to the wire volume of each section of the wire after the thermal expansion.

[0017] Further, the determining of the horizontal stress after thermal expansion according to the conductor length after thermal expansion, the span length, the span height and the equivalent specific load of the conductor after thermal expansion comprises:

[0018] Substitute the conductor length after thermal expansion, the span length, the span height and the equivalent load of the conductor after thermal expansion into the wire length calculation formula to calculate the horizontal stress after thermal expansion, wherein the wire length calculation formula is:

[0019]

[0020] Among them, L is the conductor length, γ is the equivalent specific load, σ0 is the stress at the lowest point of the conductor, l is the span length, and h is the span height.

[0021] Further, determining the maximum sag of the conductor according to the horizontal stress after thermal expansion includes:

[0022] Substitute the horizontal stress after thermal expansion into the maximum sag calculation formula to calculate the maximum sag, where the maximum sag calculation formula is:

[0023]

[0024] Among them, f M is the maximum sag, γ is the equivalent specific load, σ0 is the stress at the lowest point of the conductor, l is the span length, and β is the height difference angle between the two suspension points.

[0025] The present invention provides a conductor sag determination device, comprising:

[0026] A wire volume determination module, used for dividing the wire into a plurality of sections and determining the wire volume of each section of the wire after thermal expansion;

[0027] An equivalent specific load determination module is used to calculate the equivalent specific load of the conductor after thermal expansion according to the conductor volume of each section of the conductor after thermal expansion;

[0028] A horizontal stress determination module is used to determine the horizontal stress after thermal expansion according to the conductor length after thermal expansion, the span length, the span height and the equivalent specific load of the conductor after thermal expansion;

[0029] The maximum sag determination module is used to determine the maximum sag of the conductor according to the horizontal stress after thermal expansion.

[0030] Furthermore, dividing the conductor into a plurality of sections and determining the conductor volume of each section of the conductor after thermal expansion includes:

[0031] The wire is divided into n sections, and the length of each section of the wire after thermal expansion is calculated based on the linear expansion coefficient of the wire and the initial temperature of each section of the wire;

[0032] According to the length of each section of the wire after thermal expansion, the total length of the wire after thermal expansion is calculated;

[0033] Calculating the total volume of the wire after thermal expansion according to the total length of the wire after thermal expansion, the cross-sectional area of ​​the wire and the volume before thermal expansion;

[0034] The wire volume of each section of the wire after thermal expansion is calculated according to the total volume of the wire after thermal expansion.

[0035] Furthermore, the equivalent specific load of the conductor after thermal expansion is calculated based on the conductor volume of each section of the conductor after thermal expansion, including:

[0036] Based on the mass conservation of the wire before and after the thermal expansion, the equivalent specific load of the wire after the thermal expansion is determined according to the wire volume of each section of the wire after the thermal expansion.

[0037] The present invention provides a terminal device, comprising: 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, the conductor sag determination method as described above is implemented.

[0038] The present invention provides a computer-readable storage medium, which includes a stored computer program; wherein, when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the conductor sag determination method as described above.

[0039] The embodiment of the present invention calculates the equivalent specific load of the conductor after thermal expansion according to the conductor volume of each section of the conductor after thermal expansion, and determines the horizontal stress after thermal expansion according to the conductor length, span length, span height and the equivalent specific load of the conductor after thermal expansion, so as to calculate the sag of the conductor. The conductor sag can be calculated according to the equivalent specific load of the conductor after thermal expansion, and there is no need to use a numerical simulation method of finite element simulation to calculate the conductor sag, thereby effectively shortening the operation cycle and effectively improving the efficiency of the conductor sag.

[0040] Furthermore, the embodiments of the present invention can effectively reduce the influence of wildfire environmental conditions on sag determination by calculating the equivalent specific load of the conductor after thermal expansion as the data basis for calculating sag, and can accurately calculate the conductor sag under the condition of uneven heating of the conductor under high temperature of wildfire, thereby effectively improving the accuracy and reliability of sag calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic flow chart of a method for determining conductor sag provided by an embodiment of the present invention;

[0042] Figure 2 It is a schematic diagram of the force of an overhead power transmission line in a catenary state provided by an embodiment of the present invention;

[0043] Figure 3 It is a structural schematic diagram of a conductor sag determination device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] See also Figure 1 The present invention provides a method for determining conductor sag, comprising:

[0048] S1. Divide the conductor into several sections and determine the conductor volume of each section after thermal expansion;

[0049] The embodiment of the present invention can effectively improve the pertinence and accuracy of calculation by dividing the conductor into several sections and determining the volume of each section of the conductor after thermal expansion, thereby improving the accuracy of determining the maximum sag.

[0050] S2. Calculate the equivalent specific load of the conductor after thermal expansion according to the conductor volume of each section of the conductor after thermal expansion;

[0051] The embodiment of the present invention calculates the equivalent specific load of the conductor after thermal expansion as the data basis for calculating the sag, which can effectively improve the accuracy and reliability of the sag calculation under the condition of uneven temperature rise of the conductor under the high temperature of a wildfire.

[0052] S3, determining the horizontal stress after thermal expansion according to the conductor length after thermal expansion, the span length, the span height and the equivalent specific load of the conductor after thermal expansion;

[0053] S4. Determine the maximum sag of the conductor based on the horizontal stress after thermal expansion.

[0054] The embodiment of the present invention calculates the equivalent specific load of the conductor after thermal expansion according to the conductor volume of each section of the conductor after thermal expansion, and determines the horizontal stress after thermal expansion according to the conductor length, span length, span height and the equivalent specific load of the conductor after thermal expansion, so as to calculate the sag of the conductor. The conductor sag can be calculated according to the equivalent specific load of the conductor after thermal expansion, and there is no need to use a numerical simulation method of finite element simulation to calculate the conductor sag, thereby effectively shortening the operation cycle and effectively improving the efficiency of the conductor sag.

[0055] In one embodiment, the conductor of the overhead transmission line can be firstly used. The rigidity of the conductor has little effect on the geometric shape of the conductor suspended in the air. The conductor can be assumed to be a soft chain with hinges everywhere, that is, the conductor can only withstand axial tension but not bending moment. Assuming that the loads acting on the conductor are all pointing in the same direction and are evenly distributed along the length of the conductor, the conductor formula can be derived as the suspended strand formula, as shown in the following formulas (1) and (2).

[0056]

[0057]

[0058] Where θ is the conductor axis and N / mm 2 The inclination angle between the horizontal directions, γ is the load per unit length and unit section, that is, the equivalent specific load, N / mm 2 m. σ0 is the stress at the lowest point of the conductor, a is the projection from the lowest point O of the conductor to the low suspension point perpendicular to the load direction, l is the projection distance between two adjacent suspension points perpendicular to the load direction, that is, the span length. h is the height difference between two adjacent suspension points along the load direction, that is, the span height.

[0059] In the embodiment of the present invention, the wire length differential is By taking a definite integral along the entire gear, we can get the formula for the length of the wire suspended in the gear:

[0060]

[0061] Define β as the height difference angle between the two suspension points:

[0062]

[0063] Conductor sag distribution curve function f x As shown in formula (5), m. Using f x The sag of each point on the conductor can be calculated, and when the initial conditions of initial stress σ0, span length l, and span height difference h are determined, f is actually satisfied. x =Ax 2 +Bx is a quadratic equation, so the maximum sag is at The point is the midpoint of the span, i.e. the maximum sag f M As shown in formula (6).

[0064]

[0065]

[0066] In the embodiment of the present invention, the stress direction at any point on the overhead wire is consistent with the axial direction of the wire at that point, and its horizontal component is equal to the stress σ0 at the lowest point of the wire. In engineering, the lowest point stress σ0 is often used as a known condition. When σ0 and the axial inclination angle θ at any point of the wire are known, the stress expression of the point can be obtained.

[0067]

[0068] See also Figure 2 The coordinate arrangement in , and the derivative of the y function of each point on the catenary with respect to x, the axial slope of any point on the wire is:

[0069]

[0070] In the embodiment of the present invention, σ can be solved according to formula (9): x Relationship with σ0, where y0 is the ordinate of the lowest point of the sag.

[0071] σ x =σ0+γ(y-y0) (9)

[0072] In one embodiment, step S1, dividing the wire into a plurality of segments, and determining the wire volume of each segment of the wire after thermal expansion, comprises:

[0073] S11, dividing the wire into n sections, and calculating the length of each section of the wire after thermal expansion according to the linear expansion coefficient of the wire and the initial temperature of each section of the wire;

[0074] In the embodiment of the present invention, when the wire is exposed to the fire, the temperature of the wire is continuous, and the wire can be divided into n segments, where n can be an ideal state tending to infinity, or a suitable n can be selected under the premise of ensuring the accuracy of the calculation result, for example, n is 100. The length of each segment of the wire is recorded as ΔL i (i=1,2,3,...,n), assuming that the linear expansion coefficient of this wire is α, the initial temperature of each wire section is t0, and the temperature of each small section on the wire in the fire scene is t i (i=1,2,3,....,n), then the length of each wire after thermal expansion is ΔL i 'becomes:

[0075] ΔL i '=ΔL i [1+α(t i -t0)] (10)

[0076] S12, calculating the total length of the wire after thermal expansion according to the length of each section of the wire after thermal expansion;

[0077] In the embodiment of the present invention, the total length of the wire after thermal expansion is:

[0078] L'=ΔL'1+ΔL'2+....+ΔL' n

[0079] =ΔL1[1+α(t1-t0)]+ΔL2[1+α(t2-t0)]+...+ΔL n [1+α(t n -t0)] (11)

[0080] When the segmentation type n takes a larger value, the segment line length ΔL i Approximately:

[0081]

[0082] S13, calculating the total volume of the wire after thermal expansion according to the total length of the wire after thermal expansion, the cross-sectional area of ​​the wire and the volume before thermal expansion;

[0083] For isotropic objects, the volume expansion coefficient is three times the linear expansion coefficient. Since the mass of the wire before and after the wildfire is approximately conserved, that is:

[0084] γV=γ'V' (13)

[0085] Wherein, the volume of the conductor before thermal expansion V=LA, A is the cross-sectional area of ​​the conductor, and L can be calculated by the following formula (14):

[0086]

[0087] According to the above formula, the total volume of the wire after thermal expansion is calculated:

[0088] V'=ΔV1'+ΔV2'+...+ΔV n ' (15)

[0089] S14. Calculate the wire volume of each section of the wire after thermal expansion based on the total volume of the wire after thermal expansion.

[0090] In the embodiment of the present invention, the wire volume of each wire section after thermal expansion is:

[0091]

[0092] In one embodiment, the equivalent specific load of the wire after thermal expansion is calculated based on the wire volume of each section of the wire after thermal expansion, including:

[0093] Based on the conservation of the mass of the conductor before and after thermal expansion, the equivalent specific load of the conductor after thermal expansion is determined according to the conductor volume of each section of the conductor after thermal expansion.

[0094] In the embodiment of the present invention, formulas (15) and (16) are substituted into formula (13), and based on the mass conservation of the wire before and after thermal expansion, the equivalent specific load γ' of the wire after thermal expansion can be determined.

[0095] In the embodiment of the present invention, the length of the wire after thermal expansion can be calculated according to formulas (10), (11) and (12).

[0096] In the embodiment of the present invention, by considering the mass conservation of the conductor before and after thermal expansion, the volume of the conductor after thermal expansion can be accurately calculated, and then the equivalent specific load can be determined. The physical behavior of the conductor under temperature change can be simulated according to the mass conservation of the conductor before and after thermal expansion, thereby effectively improving the accuracy of sag calculation.

[0097] In one embodiment, determining the horizontal stress after thermal expansion according to the conductor length after thermal expansion, the span length, the span height and the equivalent specific load of the conductor after thermal expansion includes:

[0098] Substitute the conductor length after thermal expansion, span length, span height and equivalent load of the conductor after thermal expansion into the wire length calculation formula to calculate the horizontal stress after thermal expansion. The wire length calculation formula is:

[0099]

[0100] Among them, L is the conductor length, γ is the equivalent specific load, σ0 is the stress at the lowest point of the conductor, l is the span length, and h is the span height.

[0101] In the embodiment of the present invention, the horizontal stress at this time can be calculated by substituting the conductor length after thermal expansion, the span length, the span height and the equivalent load ratio of the conductor after thermal expansion into formula (3).

[0102] In the embodiment of the present invention, the horizontal stress after thermal expansion is substituted into formula (1) to obtain the hinge equation after thermal expansion.

[0103] In one embodiment, determining the maximum sag of the conductor according to the horizontal stress after thermal expansion includes:

[0104] Substitute the horizontal stress after thermal expansion into the maximum sag calculation formula to calculate the maximum sag, where the maximum sag calculation formula is:

[0105]

[0106] Among them, f M is the maximum sag, γ is the equivalent specific load, σ0 is the stress at the lowest point of the conductor, l is the span length, and β is the height difference angle between the two suspension points.

[0107] In an embodiment of the present invention, the horizontal stress after thermal expansion is substituted into formula (6) to calculate the maximum sag in the conductor. In one embodiment, the horizontal stress after thermal expansion and related known parameters are substituted into formula (5) to calculate the sag distribution at different points of the conductor, so that the maximum sag can be determined from these sag distributions.

[0108] In one embodiment, during the sag calculation process, at least one of the following parameters may be comprehensively considered: overhead line conductor model and physical material parameters, conductor uneven temperature distribution data obtained through a wildfire monitoring and early warning system or a temperature sensor, and dynamic temperature changes over time.

[0109] The implementation of the embodiments of the present invention has the following beneficial effects:

[0110] The embodiment of the present invention calculates the equivalent specific load of the conductor after thermal expansion according to the conductor volume of each section of the conductor after thermal expansion, and determines the horizontal stress after thermal expansion according to the conductor length, span length, span height and the equivalent specific load of the conductor after thermal expansion, so as to calculate the sag of the conductor. The conductor sag can be calculated according to the equivalent specific load of the conductor after thermal expansion, and there is no need to use a numerical simulation method of finite element simulation to calculate the conductor sag, thereby effectively shortening the operation cycle and effectively improving the efficiency of the conductor sag.

[0111] Furthermore, the embodiments of the present invention can effectively reduce the influence of wildfire environmental conditions on sag determination by calculating the equivalent specific load of the conductor after thermal expansion as the data basis for calculating sag, and can accurately calculate the conductor sag under the condition of uneven heating of the conductor under high temperature of wildfire, thereby effectively improving the accuracy and reliability of sag calculation.

[0112] See also Figure 3 Based on the same inventive concept as the above embodiment, the present invention provides a conductor sag determination device, comprising:

[0113] A wire volume determination module 10, for dividing the wire into a plurality of sections and determining the wire volume of each section of the wire after thermal expansion;

[0114] An equivalent specific load determination module 20, used to calculate the equivalent specific load of the conductor after thermal expansion according to the conductor volume of each section of the conductor after thermal expansion;

[0115] A horizontal stress determination module 30, for determining the horizontal stress after thermal expansion according to the conductor length after thermal expansion, the span length, the span height and the equivalent specific load of the conductor after thermal expansion;

[0116] The maximum sag determination module 40 is used to determine the maximum sag of the conductor according to the horizontal stress after thermal expansion.

[0117] In one embodiment, the conductor is divided into a plurality of sections, and the conductor volume of each section of the conductor after thermal expansion is determined, including:

[0118] The wire is divided into n sections, and the length of each section of the wire after thermal expansion is calculated based on the linear expansion coefficient of the wire and the initial temperature of each section of the wire;

[0119] According to the length of each section of the wire after thermal expansion, the total length of the wire after thermal expansion is calculated;

[0120] The total volume of the wire after thermal expansion is calculated based on the total length of the wire after thermal expansion, the cross-sectional area of ​​the wire and the volume before thermal expansion;

[0121] The wire volume of each section of the wire after thermal expansion is calculated based on the total volume of the wire after thermal expansion.

[0122] In one embodiment, the equivalent specific load of the wire after thermal expansion is calculated based on the wire volume of each section of the wire after thermal expansion, including:

[0123] Based on the conservation of the mass of the conductor before and after thermal expansion, the equivalent specific load of the conductor after thermal expansion is determined according to the conductor volume of each section of the conductor after thermal expansion.

[0124] In one embodiment, determining the horizontal stress after thermal expansion according to the conductor length after thermal expansion, the span length, the span height and the equivalent specific load of the conductor after thermal expansion includes:

[0125] Substitute the conductor length after thermal expansion, span length, span height and equivalent load of the conductor after thermal expansion into the wire length calculation formula to calculate the horizontal stress after thermal expansion. The wire length calculation formula is:

[0126]

[0127] Among them, L is the conductor length, γ is the equivalent specific load, σ0 is the stress at the lowest point of the conductor, l is the span length, and h is the span height.

[0128] In one embodiment, determining the maximum sag of the conductor according to the horizontal stress after thermal expansion includes:

[0129] Substitute the horizontal stress after thermal expansion into the maximum sag calculation formula to calculate the maximum sag, where the maximum sag calculation formula is:

[0130]

[0131] Among them, f M is the maximum sag, γ is the equivalent specific load, σ0 is the stress at the lowest point of the conductor, l is the span length, and β is the height difference angle between the two suspension points.

[0132] Correspondingly, an embodiment of the present invention further provides a terminal device, comprising: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the method for determining the conductor sag of any one of the above embodiments is implemented.

[0133] The terminal device of this embodiment includes: a processor, a memory, and a computer program and computer instructions stored in the memory and executable on the processor. When the processor executes the computer program, each step in the above embodiment 1 is implemented, for example Figure 1 Alternatively, when the processor executes the computer program, the functions of each module / unit in the above device embodiment, such as the horizontal stress determination module 30, are implemented.

[0134] Exemplarily, the computer program can be divided into one or more modules / units, one or more modules / units are stored in a memory and executed by a processor to complete the present invention. One or more modules / units can be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device. For example, the horizontal stress determination module 30 is used to determine the horizontal stress after thermal expansion based on the wire length after thermal expansion, the span length, the span height and the equivalent load of the wire after thermal expansion.

[0135] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the schematic diagram is merely an example of a terminal device and does not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown in the diagram, or may combine certain components, or different components. For example, the terminal device may also include an input / output device, a network access device, a bus, etc.

[0136] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0137] The memory can be used to store computer programs and / or modules. The processor realizes various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile terminal, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0138] Among them, if the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0139] Accordingly, an embodiment of the present invention further provides a computer-readable storage medium, the computer-readable storage medium including a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the conductor sag determination method of any one of the above embodiments.

[0140] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for determining conductor sag, characterized in that: include: Divide the conductor into several sections and determine the conductor volume of each section after thermal expansion; The equivalent specific load of the conductor after thermal expansion is calculated based on the conductor volume of each section of the conductor after thermal expansion; Determine the horizontal stress after thermal expansion based on the conductor length after thermal expansion, the span length, the span height and the equivalent specific load of the conductor after thermal expansion; The maximum sag of the conductor is determined according to the horizontal stress after thermal expansion.

2. The method for determining conductor sag according to claim 1, characterized in that: The step of dividing the conductor into a plurality of sections and determining the conductor volume of each section of the conductor after thermal expansion includes: The wire is divided into n sections, and the length of each section of the wire after thermal expansion is calculated based on the linear expansion coefficient of the wire and the initial temperature of each section of the wire; According to the length of each section of the wire after thermal expansion, the total length of the wire after thermal expansion is calculated; Calculating the total volume of the wire after thermal expansion according to the total length of the wire after thermal expansion, the cross-sectional area of ​​the wire and the volume before thermal expansion; The wire volume of each section of the wire after thermal expansion is calculated according to the total volume of the wire after thermal expansion.

3. The method for determining conductor sag according to claim 1, characterized in that: The method of calculating the equivalent specific load of the conductor after thermal expansion according to the conductor volume of each section of the conductor after thermal expansion includes: Based on the mass conservation of the wire before and after the thermal expansion, the equivalent specific load of the wire after the thermal expansion is determined according to the wire volume of each section of the wire after the thermal expansion.

4. The method for determining conductor sag according to claim 1, wherein: The method of determining the horizontal stress after thermal expansion according to the conductor length after thermal expansion, the span length, the span height and the equivalent specific load of the conductor after thermal expansion comprises: Substitute the conductor length after thermal expansion, the span length, the span height and the equivalent load of the conductor after thermal expansion into the wire length calculation formula to calculate the horizontal stress after thermal expansion, wherein the wire length calculation formula is: Among them, L is the conductor length, γ is the equivalent specific load, σ0 is the stress at the lowest point of the conductor, l is the span length, and h is the span height.

5. The method for determining conductor sag according to claim 1, characterized in that: Determining the maximum sag of the conductor according to the horizontal stress after thermal expansion includes: Substitute the horizontal stress after thermal expansion into the maximum sag calculation formula to calculate the maximum sag, where the maximum sag calculation formula is: Among them, f M is the maximum sag, γ is the equivalent specific load, σ0 is the stress at the lowest point of the conductor, l is the span length, and β is the height difference angle between the two suspension points.

6. A conductor sag determination device, characterized in that: include: A wire volume determination module, used for dividing the wire into a plurality of sections and determining the wire volume of each section of the wire after thermal expansion; An equivalent specific load determination module is used to calculate the equivalent specific load of the conductor after thermal expansion according to the conductor volume of each section of the conductor after thermal expansion; A horizontal stress determination module is used to determine the horizontal stress after thermal expansion according to the conductor length after thermal expansion, the span length, the span height and the equivalent specific load of the conductor after thermal expansion; The maximum sag determination module is used to determine the maximum sag of the conductor according to the horizontal stress after thermal expansion.

7. The conductor sag determination device according to claim 6, characterized in that: The step of dividing the conductor into a plurality of sections and determining the conductor volume of each section of the conductor after thermal expansion includes: The wire is divided into n sections, and the length of each section of the wire after thermal expansion is calculated based on the linear expansion coefficient of the wire and the initial temperature of each section of the wire; According to the length of each section of the wire after thermal expansion, the total length of the wire after thermal expansion is calculated; Calculating the total volume of the wire after thermal expansion according to the total length of the wire after thermal expansion, the cross-sectional area of ​​the wire and the volume before thermal expansion; The wire volume of each section of the wire after thermal expansion is calculated according to the total volume of the wire after thermal expansion.

8. The conductor sag determination device according to claim 6, characterized in that: The method of calculating the equivalent specific load of the conductor after thermal expansion according to the conductor volume of each section of the conductor after thermal expansion includes: Based on the mass conservation of the wire before and after the thermal expansion, the equivalent specific load of the wire after the thermal expansion is determined according to the wire volume of each section of the wire after the thermal expansion.

9. A terminal device, characterized in that: include: A processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for determining the conductor sag according to any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program; wherein, when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the conductor sag determination method according to any one of claims 1 to 5.

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