10kV distribution line icing stress analysis method based on linear cement single pole

Abstract

The invention discloses a 10kV distribution line icing stress analysis method based on a linear cement single pole, and relates to the technical field of electric power disaster prevention, and the method comprises the steps: building a three-dimensional physical model of a 12-meter linear cement single pole; importing the three-dimensional physical model into finite element simulation analysis software, setting material attributes of each structure in the 12-meter linear cement single pole physical model, adding a physical field and dividing grids for calculation; and analyzing to obtain the displacement conditions of the line and the pole tower in the 12m linear cement single pole physical model after different icing of the 10KV distribution line. According to the method, by establishing a physical model of the 12-meter linear cement single pole and setting material attributes in finite element software and constraint conditions such as gravity load, icing load and wind load applied to the 12-meter linear cement single pole during icing, displacement conditions of a wire and a pole tower during icing of different thicknesses can be judged and obtained; and a judgment basis is provided for judging whether the distribution line is influenced by icing to generate faults or not.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power disaster prevention, and in particular to an ice stress analysis method for a 10kV distribution line based on a straight cement single pole. Background Art

[0002] Severe weather has become an important factor causing distribution line failures, and icing is a serious natural disaster that affects the safety of the power system and is the most likely type of disaster to cause mass tripping of distribution lines. Severe icing causes overloads on towers and conductors, resulting in unbalanced tension, which will cause large-scale tower collapses, pole collapses, line breaks, and tripping accidents. Therefore, in-depth research on the influencing factors and mathematical models of power grid icing disasters, achieving quantitative assessment of power grid safety under ice and snow disaster meteorological conditions, and accurately analyzing the impact of external meteorological events on the power grid is one of the important foundations for the current research on comprehensive power grid situation awareness.

[0003] At present, the research on transmission line icing simulation has been widely carried out at home and abroad, and has achieved certain research results. Wang Yan et al. established a three-dimensional finite element model of the tower-line coupling structure, proposed the critical failure curve of the line tension section under certain wind speed and ice thickness conditions, and obtained the distribution of weak points of the tower based on mechanical analysis and calculation, and optimized the tower structure. Zhang Feng et al. established a 500KV tower-line system finite element model, and conducted a targeted wind resistance assessment on the tower based on the determination of the weak links of the tower. There is still a certain gap in the finite element analysis of icing on distribution lines. This research project uses SOLIDWORKS software to establish a three-dimensional physical model of a 12-meter straight cement single pole and conducts simulation analysis through finite element analysis software, simulating the displacement of the conductor and tower of the 12-meter straight cement single pole when ice is applied at different thicknesses, providing a basis for judging whether the distribution line will fail due to the influence of icing. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the present invention provides an ice stress analysis method for a 10kV distribution line based on a straight cement single pole, which can solve the problems mentioned in the background technology.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a method for analyzing the icing stress of a 10kV distribution line based on a straight cement single pole, comprising: establishing a three-dimensional physical model of a 12-meter straight cement single pole; importing the three-dimensional physical model into finite element simulation analysis software, setting the material properties of each structure in the physical model of the 12-meter straight cement single pole, adding a physical field and dividing the grid for calculation; analyzing and obtaining the displacement of the line and the pole tower in the physical model of the 12-meter straight cement single pole after different icing of the 10KV distribution line.

[0007] As a preferred solution of the 10kV distribution line icing stress analysis method based on a straight cement single pole described in the present invention, wherein: the three-dimensional physical model includes a pole body, a straight cross arm, a column insulator, a clamp and an insulated conductor; the three-dimensional physical model of the 12-meter straight cement single pole is established, which specifically includes the following steps: building a 12-meter straight cement single pole body part, with a tip diameter of 190mm, a root diameter of 350mm, and a height of 12 meters; building a straight cross arm part; building a clamp part; the clamp part specifically has an inner diameter of 10 0mm U-shaped clamp; build column insulator parts; the column insulator parts are specifically three-piece column insulators, the top diameter of the insulator is 80mm, the nominal diameter of the three porcelain pieces is 125mm, and the nominal total height is 306mm; build insulating wire parts, simulate the construction of JKLYJ-10 / 50 insulated wire, with an outer diameter of 16.1mm, a unit mass of 283kg / km, and a span of 50m; form all parts into an assembly, and establish a proportional three-dimensional physical model of a 12-meter straight cement single pole.

[0008] As a preferred solution of the icing stress analysis method of the 10kV distribution line based on the straight cement single pole described in the present invention, wherein: the three-dimensional physical model is imported into the finite element simulation analysis software, the material properties of each structure in the 12-meter straight cement single pole physical model are set, the physical field is added and the grid is divided for calculation, including the following steps: using SOLIDWORKS software to establish a 1:1 three-dimensional physical model of the 12-meter straight cement single pole and importing it into the finite element simulation analysis software; according to the specific structural conditions of the 10KV distribution line, corresponding materials are set for each part of the three-dimensional physical model; according to the actual installation environment and meteorological conditions of the 10KV distribution line, boundary conditions are set for the simulation, and loads are applied to the relevant parts of the 12-meter straight cement single pole; considering the operation time and accuracy, different parts of the three-dimensional model are divided into different scales and divided into several solution units; the displacement parameters of the conductor are calculated one by one, and the displacement of the center conductor of the 12-meter straight cement single pole physical model after different icing of the 10KV distribution line is analyzed.

[0009] As a preferred solution of the ice stress analysis method for a 10kV distribution line based on a straight cement single pole described in the present invention, in which: in the application of load to the relevant parts of the 12-meter straight cement single pole, the load includes gravity load, ice load and wind load.

[0010] Among them, the gravity load is applied to the conductor of the 12-meter straight cement single pole, and the calculation formula is as follows:

[0011] F g =m0L0g b ;

[0012] In the formula, F gis the conductor deadweight load, in N; m0 is the mass per unit length of the conductor, in kg / m; L0 is the horizontal span of the 10KV straight cement single pole, in m; g b is the local gravitational acceleration, g b =9.80665m / s 2 .

[0013] Apply ice load to the conductor of a 12-meter straight cement single pole, and the calculation formula is as follows:

[0014] F b =ρ b πb(d+b)g b L0;

[0015] In the formula, F b is the conductor ice load, in N; ρ b is the ice density in kg / m 3 In general, the ice density ρ is taken as 0.9×10 3 kg / m 3 ; b is the ice thickness, unit is m; d is the outer diameter of the conductor, unit is m.

[0016] As a preferred solution of the icing stress analysis method of a 10kV distribution line based on a straight cement single pole according to the present invention, a wind load is applied to the conductor of a 12-meter straight cement single pole, and the calculation formula is as follows:

[0017]

[0018] In the formula, F f is the horizontal wind load value perpendicular to the conductor direction, in N; α is the wind pressure unevenness coefficient; v is the wind speed, in m / s; ρ f is the air density in kg / m 3 ;μ z is the wind pressure height variation coefficient, the wind pressure height variation coefficient with a base height of 10m is taken as 1.0 according to the height from the ground and the ground roughness category; μ sc It is the body coefficient of the conductor. When the wire diameter is less than 17mm or covered with ice, μ sc =1.2; when the wire diameter is greater than or equal to 17mm, take 1.1; β c is the conductor wind load adjustment coefficient; B1 is the conductor ice wind load increase coefficient. When the ice thickness is 0mm, 5mm, 10mm, 15mm, 20mm, 25mm and 30mm and above, the conductor ice wind load increase coefficient B1 is 0.8, 1.1, 1.2, 1.3, 1.5, 1.7 and 2 respectively; θ is the angle between the wind direction and the conductor direction.

[0019] Apply wind load to the 12-meter straight cement single pole, and the calculation formula is as follows:

[0020]

[0021] In the formula, F z is the horizontal wind load value perpendicular to the pole body, in N; μ s is the shape coefficient of the component; B2 is the increase coefficient of the wind load on the tower component due to ice coating. When the ice coating thickness is 0mm, 5mm, 10mm, 15mm, 20mm, 25mm and 30mm and above, the increase coefficient of the wind load on the conductor due to ice coating B1 is 0.8, 1.1, 1.2, 1.6, 1.8, 2 and 2.5 respectively; A f is the calculated value of the projected area of ​​the windward component, in m 2 .

[0022] As a preferred solution of the ice stress analysis method for a 10kV distribution line based on a straight cement single pole described in the present invention, wherein: the boundary conditions are set for simulation based on the actual installation environment and meteorological conditions of the 10KV distribution line, and fixed constraints need to be imposed on the bottom of the pole and both ends of the conductor to simulate the displacement changes of the conductor.

[0023] As a preferred solution of the ice stress analysis method for a 10kV distribution line based on a straight cement single pole described in the present invention, wherein: the operation time and accuracy are comprehensively considered, and different parts of the three-dimensional model are divided into different scales and divided into several solution units. Specifically, from the perspective of shortening the operation time and improving the operation accuracy, the three-dimensional physical model is meshed using tetrahedrons as basic units, and the small and complex areas of the three-dimensional physical model are meshed with high precision through the local refinement meshing method, and the large and regular areas are meshed using a rough meshing method.

[0024] To further solve the above technical problems, the present invention provides the following technical solutions: a 10kV distribution line icing stress analysis system based on a straight cement single pole, comprising: a model building module, used to establish a three-dimensional physical model of a 12-meter straight cement single pole; a simulation calculation module, used to import the three-dimensional physical model into a finite element simulation analysis software, set the material properties of each structure in the 12-meter straight cement single pole physical model, add a physical field and divide the grid for calculation; an analysis module, used to analyze and obtain the displacement of the line and the pole tower in the 12-meter straight cement single pole physical model after different icing of the 10KV distribution line.

[0025] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of the above-mentioned method for analyzing ice stress of a 10kV distribution line based on a straight cement single pole are implemented.

[0026] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of the above-mentioned method for analyzing ice stress of a 10kV distribution line based on a straight cement single pole are implemented.

[0027] Beneficial effects of the present invention: The present invention establishes a physical model of a 12-meter straight cement single pole, sets material properties in finite element software, and applies constraints such as gravity load, ice load and wind load to the 12-meter straight cement single pole when ice is applied. The displacement of the conductor and the pole tower when ice is applied with different thicknesses can be determined, providing a basis for determining whether a distribution line will fail due to ice application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 This is an overall flow chart of the ice stress analysis method for a 10kV distribution line based on a straight cement single pole proposed by the present invention;

[0030] Figure 2 This is a mesh division diagram of a 12-meter straight cement single pole three-dimensional physical model in the 10kV distribution line ice stress analysis method based on a straight cement single pole proposed in the present invention;

[0031] Figure 3 This is the distribution diagram of conductor displacement under different ice coating thicknesses in the ice coating stress analysis method for 10kV distribution line based on straight cement single pole proposed in the present invention. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Example 1, reference Figure 1 to Figure 3 , which is an embodiment of the present invention, provides an ice stress analysis method for a 10kV distribution line based on a straight cement single pole.

[0035] The present application provides an effective solution to the above-mentioned problems. Next, a plurality of embodiments will be combined to explain in detail how to implement the icing stress analysis method of a 10kV distribution line based on a straight cement single pole.

[0036] Figure 1 The overall flow chart of the icing stress analysis method for a 10kV distribution line based on a straight cement single pole is shown, including:

[0037] S1: Establish a three-dimensional physical model of a 12-meter straight cement pole.

[0038] In an optional embodiment, the physical model is established using SOLIDWORKS software.

[0039] S1.1: Build a 12-meter straight cement single-pole body part, with a tip diameter of 190mm, a root diameter of 350mm, and a height of 12 meters. To simplify the calculation, the steel bars and spiral bars inside the pole are ignored;

[0040] S1.2: Build the straight cross arm parts. The straight cross arm is a tool used to install insulators and support wires on the top of the pole. The present invention uses a straight cross arm with a length of 1.7m;

[0041] S1.3: Build the clamp parts. The clamp is a fastener. The present invention uses a U-shaped clamp with an inner diameter of 100 mm to fasten the straight cross arm;

[0042] S1.4: Build the column insulator parts. The column insulator is an insulating and fixing device used in overhead power lines. Their main function is to provide the necessary electrical insulation for the conductors, while ensuring that the conductors can be fixed on the cement poles to support the conductors and withstand certain mechanical loads. The present invention uses three column insulators, the top diameter of the insulator is 80mm, the nominal diameter of the three porcelain pieces is 125mm, and the nominal total height is 306mm;

[0043] S1.5: Build insulated wire parts, simulate the construction of JKLYJ-10 / 50 insulated wire, with an outer diameter of 16.1mm, a unit mass of 283kg / km, and a span of 50m;

[0044] S1.6: Assemble all the above parts and build a 1:1 three-dimensional physical model of the 12-meter straight cement pole.

[0045] S2: Import the three-dimensional physical model constructed in S1 into the finite element simulation analysis software, set the material properties of each structure in the 12-meter straight cement single pole physical model, add the physical field and divide the grid for calculation.

[0046] Specifically, different materials are configured for the parts of the 12-meter straight cement single pole, and the material properties are set, as shown in Table 1:

[0047] Table 112m straight cement single pole parts material properties

[0048]

[0049] S2.1: Use SOLIDWORKS software to build a 1:1 three-dimensional physical model of the 12-meter straight cement pole and import it into the finite element simulation analysis software.

[0050] S2.2: According to the specific structure of the 10KV distribution line, set the corresponding material for each part of the 3D physical model; among them, configure different materials for the parts of each part of the 12-meter straight cement single pole, and set the material properties, as follows:

[0051] The density of the conductor is 2700kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 7.6×1010Pa;

[0052] The density of the insulator is 3000kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 1.9×1011Pa;

[0053] The density of crossarms and hoop is 7850kg / m 3 , Poisson's ratio is 0.3, and Young's modulus is 1.9×1011Pa;

[0054] The density of the concrete rod is 600kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 4×1010Pa.

[0055] S2.3: According to the actual installation environment and meteorological conditions of the 10KV distribution line, boundary conditions are set for the simulation, and gravity load, ice load and wind load are applied to the relevant parts of the 12-meter straight cement single pole.

[0056] Among them, the gravity load is applied to the conductor of the 12-meter straight cement single pole, and the calculation formula is as follows:

[0057] F g =m0L0g b ;

[0058] In the formula, F gis the conductor deadweight load, in N; m0 is the mass per unit length of the conductor, in kg / m; L0 is the horizontal span of the 10KV straight cement single pole, in m; g b is the local gravitational acceleration, g b =9.80665m / s 2 .

[0059] Apply ice load to the conductor of a 12-meter straight cement single pole, and the calculation formula is as follows:

[0060] F b =ρ b πb(d+b)g b L0;

[0061] In the formula, F b is the conductor ice load, in N; ρ b is the ice density in kg / m 3 In general, the ice density ρ is taken as 0.9×10 3 kg / m 3 ; b is the ice thickness, unit is m; d is the outer diameter of the conductor, unit is m.

[0062] During simulation, the outer diameter of the conductor is set to 16.1 mm, and the ice thickness is set to parametric scanning, scanning every 5 mm from 0 mm to 30 mm.

[0063] Specifically, the wind load is applied to the conductor of a 12-meter straight cement single pole, and the calculation formula is as follows:

[0064]

[0065] In the formula, F f is the horizontal wind load value perpendicular to the conductor direction, in N; α is the wind pressure unevenness coefficient, which should be based on the design basic wind speed. When the wind speed is less than or equal to 20m / s, it is generally taken as 1.0, when it is greater than 20m / s and less than or equal to 27m / s, it is taken as 0.85, when it is greater than 27m / s and less than or equal to 31.5, it is taken as 0.75, and when it is greater than 31.5m / s, it is removed from 0.7; v is the wind speed, in m / s; ρ f is the air density in kg / m 3 In general, the air density is ρ = 1.29 kg / m 3 ;μ z is the wind pressure height variation coefficient, the wind pressure height variation coefficient with a reference height of 10m is determined according to Table 2; μ sc It is the body factor of the conductor. When the wire diameter is less than 17mm or covered with ice (regardless of the wire diameter), μ sc =1.2; when the wire diameter is greater than or equal to 17mm, take 1.1; β cis the conductor wind load adjustment coefficient, which is generally taken as 1.0 for 10KV lines; B1 is the conductor icing wind load increase coefficient, which is determined according to Table 3; θ is the angle between the wind direction and the conductor direction.

[0066] Table 2 Wind pressure height variation coefficient μ z

[0067]

[0068] Note: Surface roughness category A refers to areas near the sea, islands, coasts, lake shores and desert areas; category B refers to fields, villages, jungles, hills, towns with relatively sparse houses and urban suburbs; category C refers to urban areas with densely packed buildings; category D refers to urban areas with densely packed buildings and taller houses.

[0069] During simulation, the wind speed is set to 20m / s, the α value is 1.0, and μ z The value is 1.0, μ sc The value is 1.2, θ is 90°, and B1 changes according to the thickness of the ice cover.

[0070] Table 3 Conductor ice-covered wind load increase factor B1

[0071]

[0072] Apply wind load to the 12-meter straight cement single pole, and the calculation formula is as follows:

[0073]

[0074] In the formula, F z is the horizontal wind load value perpendicular to the pole body, in N; μ s is the shape factor of the component, which is generally taken as 0.7; B2 is the increase factor of the tower component ice-covered wind load, which is determined according to Table 4; A f is the calculated value of the projected area of ​​the windward component, in m 2 .

[0075] During simulation, μ s The value is 0.7, and A is calculated by the tip diameter and root diameter of the rod. f About 4.03m 2 , B2 changes according to the thickness of ice cover.

[0076] Table 4 Increase factor B2 of wind load on tower components due to icing

[0077]

[0078] Specifically, in order to set the boundary conditions for the simulation, it is necessary to impose fixed constraints on the bottom of the rod and both ends of the wire to simulate the displacement change of the wire.

[0079] S2.4: Taking into account the computing time and accuracy, the different parts of the three-dimensional model are divided into several solution units at different scales.

[0080] Specifically, from the perspective of shortening calculation time and improving calculation accuracy, tetrahedron is used as the basic unit to mesh the three-dimensional physical model, and the small and complex areas of the three-dimensional physical model are meshed with high precision through the local refinement method, and the large and regular areas are meshed by the coarse meshing method.

[0081] Finally, the displacement of the conductor and the tower under different ice thicknesses is calculated. As the thickness of the conductor ice increases, the displacement of the conductor also increases. The displacement change of the conductor at the center of the two towers is the largest and the change is large. When the ice thickness is 30mm, the maximum value of the conductor displacement can reach is 0.34m.

[0082] When the arc length is 0m, no matter how thick the ice is, there is no displacement because a fixed constraint is applied to one section of the conductor. At an arc length of 50m, which is the center of the 12-meter straight cement pole, a slight displacement will occur because the pole tower is subject to horizontal wind force. When the ice thickness is 30mm, the displacement is about 4cm, which also means that under the influence of wind, the head of the 12-meter straight cement pole will be displaced by 4cm, which may cause a failure.

[0083] S2.5: Calculate the displacement parameters of the conductors one by one, and analyze the displacement of the centerline conductor of the 12-meter straight cement single-pole physical model of the 10KV distribution line after different ice coverage.

[0084] S3: The displacement of the line and tower in the 12-meter straight cement single pole physical model of the 10KV distribution line after different ice coverage was analyzed.

[0085] In summary, the present invention establishes a physical model of a 12-meter straight cement single pole, sets material properties in the finite element software, and applies constraints such as gravity load, ice load and wind load to the 12-meter straight cement single pole when it is covered with ice. The displacement of the conductor and the pole tower when ice is covered with different thicknesses can be determined, thereby providing a basis for determining whether a distribution line will fail due to ice coverage.

[0086] Embodiment 2 is an embodiment of the present invention, which provides a 10kV distribution line icing stress analysis system based on a straight cement single pole, including: a model building module, used to establish a three-dimensional physical model of a 12-meter straight cement single pole; a simulation calculation module, used to import the three-dimensional physical model into a finite element simulation analysis software, set the material properties of each structure in the 12-meter straight cement single pole physical model, add a physical field and divide the grid for calculation; an analysis module, used to analyze and obtain the displacement of the line and the pole tower in the 12-meter straight cement single pole physical model after different icing of the 10KV distribution line.

[0087] Embodiment 3 is an embodiment of the present invention, which is different from the previous embodiment in that: if the function is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0088] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0089] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0090] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0091] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A 10kV distribution line ice stress analysis method based on a straight cement single pole, characterized in that: include: Establish a 3D physical model of a 12-meter straight cement pole; The three-dimensional physical model is imported into the finite element simulation analysis software, the material properties of each structure in the 12-meter straight cement single-pole physical model are set, the physical field is added and the grid is divided for calculation; The analysis revealed the displacement of the line and tower in the 12-meter straight cement single-pole physical model of the 10KV distribution line after different ice coverage.

2. The ice stress analysis method for a 10kV distribution line based on a straight cement single pole according to claim 1 is characterized in that: The three-dimensional physical model includes a pole body, a straight cross arm, a post insulator, a clamp and an insulated conductor; The three-dimensional physical model of the 12-meter straight cement single pole is established, which specifically includes the following steps: Build a 12-meter straight cement single pole body part, with a tip diameter of 190mm, a root diameter of 350mm, and a height of 12 meters; Build the straight crossarm parts; Build a clamp part; the clamp part is specifically a U-shaped clamp with an inner diameter of 100 mm; Build a column insulator part; the column insulator part specifically includes three column insulators, the top diameter of the insulator is 80 mm, the nominal diameter of the three porcelain pieces is 125 mm, and the nominal total height is 306 mm; Build insulated wire parts and simulate the construction of JKLYJ-10 / 50 insulated wire, with an outer diameter of 16.1mm, a unit mass of 283kg / km, and a span of 50m; All parts are assembled into an equal-proportion three-dimensional physical model of the 12-meter straight cement pole.

3. The ice stress analysis method for a 10kV distribution line based on a straight cement single pole according to claim 2 is characterized in that: The three-dimensional physical model is imported into the finite element simulation analysis software, the material properties of each structure in the 12-meter straight cement single-pole physical model are set, the physical field is added and the grid is divided for calculation, including the following steps: Use SOLIDWORKS software to build a 1:1 three-dimensional physical model of a 12-meter straight cement pole and import it into finite element simulation analysis software; According to the specific structure of the 10KV distribution line, set the corresponding material for each part of the 3D physical model; According to the actual installation environment and meteorological conditions of the 10KV distribution line, boundary conditions are set for the simulation, and loads are applied to the relevant parts of the 12-meter straight cement single pole; Taking into account the computing time and accuracy, the different parts of the 3D model are divided into different scales and divided into several solving units; The displacement parameters of the conductors were calculated successively, and the displacement of the centerline conductor in the 12-meter straight cement single-pole physical model of the 10KV distribution line after different ice coverage was analyzed.

4. The ice stress analysis method for a 10kV distribution line based on a straight cement single pole according to claim 3 is characterized in that: In the said application of loads to the relevant parts of the 12-meter straight cement single pole, the said loads include gravity loads, ice loads and wind loads; Among them, the gravity load is applied to the conductor of the 12-meter straight cement single pole, and the calculation formula is as follows: F g =m0L0g b ; In the formula, F g is the conductor deadweight load, in N; m0 is the mass per unit length of the conductor, in kg / m; L0 is the horizontal span of the 10KV straight cement single pole, in m; g b is the local gravitational acceleration, g b =9.80665m / s 2 ; Apply ice load to the conductor of a 12-meter straight cement single pole, and the calculation formula is as follows: F b =ρ b πb(d+b)g b L0; In the formula, F b is the conductor ice load, in N; ρ b is the ice density in kg / m 3 In general, the ice density ρ is taken as 0.9×10 3 kg / m 3 ; b is the ice thickness, unit is m; d is the outer diameter of the conductor, unit is m.

5. The ice stress analysis method for a 10kV distribution line based on a straight cement single pole according to claim 4 is characterized in that: Apply wind load to the conductor of a 12-meter straight cement single pole, and the calculation formula is as follows: In the formula, F f is the horizontal wind load value perpendicular to the conductor direction, in N; α is the wind pressure unevenness coefficient; v is the wind speed, in m / s; ρ f is the air density in kg / m 3 ;μ z is the wind pressure height variation coefficient, the wind pressure height variation coefficient with a base height of 10m is taken as 1.0 according to the height from the ground and the ground roughness category; μ sc It is the body coefficient of the conductor. When the wire diameter is less than 17mm or covered with ice, μ sc =1.2; when the wire diameter is greater than or equal to 17mm, take 1.1; β c is the conductor wind load adjustment coefficient; B1 is the conductor ice wind load increase coefficient. When the ice thickness is 0mm, 5mm, 10mm, 15mm, 20mm, 25mm and 30mm and above, the conductor ice wind load increase coefficient B1 is 0.8, 1.1, 1.2, 1.3, 1.5, 1.7 and 2 respectively; θ is the angle between the wind direction and the conductor direction; Apply wind load to the 12-meter straight cement single pole, and the calculation formula is as follows: In the formula, F z is the horizontal wind load value perpendicular to the pole body, in N; μ s is the shape coefficient of the component; B2 is the increase coefficient of the wind load on the tower component due to ice coating. When the ice coating thickness is 0mm, 5mm, 10mm, 15mm, 20mm, 25mm and 30mm and above, the increase coefficient of the wind load on the conductor due to ice coating B1 is 0.8, 1.1, 1.2, 1.6, 1.8, 2 and 2.5 respectively; A f is the calculated value of the projected area of ​​the windward component, in m 2 .

6. The ice stress analysis method for a 10kV distribution line based on a straight cement single pole according to claim 5 is characterized in that: The boundary conditions for simulation are set according to the actual installation environment and meteorological conditions of the 10KV distribution line. It is necessary to impose fixed constraints on the bottom of the pole and both ends of the conductor to simulate the displacement change of the conductor.

7. The ice stress analysis method for a 10kV distribution line based on a straight cement single pole according to claim 6 is characterized in that: The method comprehensively considers the operation time and accuracy, divides different parts of the three-dimensional model into different scales, and divides them into several solution units. Specifically, from the perspective of shortening the operation time and improving the operation accuracy, tetrahedron is used as the basic unit to mesh the three-dimensional physical model, and the small and complex areas of the three-dimensional physical model are divided with high precision through the local refinement method, and the large and regular areas are divided by the coarse division method.

8. A system using the 10kV distribution line ice stress analysis method based on a straight cement single pole as described in any one of claims 1 to 7, characterized in that: include: Model building module, used to build a 3D physical model of a 12-meter straight cement pole; A simulation calculation module is used to import the three-dimensional physical model into the finite element simulation analysis software, set the material properties of each structure in the 12-meter straight cement single rod physical model, add a physical field and divide the grid for calculation; The analysis module is used to analyze the displacement of the line and tower in the 12-meter straight cement single-pole physical model of the 10KV distribution line after different ice coverage.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the ice stress analysis method for a 10kV distribution line based on a straight cement single pole according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the ice stress analysis method for a 10kV distribution line based on a straight cement single pole according to any one of claims 1 to 7 are implemented.

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