Tower head side phase electrical clearance calculation method and device and storage medium

Abstract

The invention discloses a tower head side phase electrical clearance calculation method and device and a storage medium, and belongs to the technical field of power transmission lines, and the method comprises the following steps: obtaining model parameters, tower head side phase string length and tower head side phase I string wind deflection angle; after the model parameters are imported into a pre-constructed power transmission tower head side phase I-string planar model, an initial tower head side phase electrical gap calculation formula is deduced according to the relation between the side length and the angle of a triangle; the influence of the conductor sag height, the conductor splitting spacing and the gap margin is considered, and the initial tower head side-phase electrical gap calculation formula is corrected to obtain a corrected tower head side-phase electrical gap calculation formula; and substituting the tower head side phase string length and the tower head side phase I string wind deflection angle into the corrected tower head side phase electrical gap calculation formula, and calculating to obtain the tower head side phase electrical gap. According to the method, the tower head side phase electrical gap can be accurately calculated, and key theoretical guidance is provided for power transmission line side phase insulation cooperation.

Description

Technical Field

[0001] The present invention relates to a method, device and storage medium for calculating the electrical clearance of the side phase of a tower head, and belongs to the technical field of transmission lines. Background Art

[0002] With the continuous development of China's social economy, the social demand for electric energy shows a rapid growth trend, and it is inevitable to expand the construction of transmission lines. In this process, it is inevitable to introduce new transmission towers, resulting in a significant increase in the number of transmission towers. At the same time, in the design of newly built transmission lines, the insulation performance requirements of each tower need to be fully considered, which increases the workload of insulation verification. There is an urgent need for a method in the prior art that can accurately calculate the electrical clearance of the side phase of the tower head to provide key theoretical guidance for the insulation coordination of the side phase of the transmission line. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a method, device and storage medium for calculating the electrical clearance of the side phase of a tower head, which can accurately calculate the electrical clearance of the side phase of the tower head and provide key theoretical guidance for the insulation coordination of the side phase of the transmission line.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present invention provides a method for calculating the electrical clearance of the side phase of a tower head, including the following steps:

[0006] Obtain model parameters, the length of the side phase string of the tower head, and the wind deflection angle of the side phase I string of the tower head, where the model parameters include transmission line tower parameters, conductor parameters, and insulator parameters;

[0007] After importing the model parameters into a pre-constructed plane model of the side phase I string of the transmission tower head, derive an initial formula for calculating the electrical clearance of the side phase of the tower head based on the relationship between the side lengths and angles of a triangle;

[0008] Considering the influence of the conductor sag height, conductor split spacing, and clearance margin, correct the initial formula for calculating the electrical clearance of the side phase of the tower head to obtain a corrected formula for calculating the electrical clearance of the side phase of the tower head;

[0009] Substitute the length of the side phase string of the tower head and the wind deflection angle of the side phase I string of the tower head into the corrected formula for calculating the electrical clearance of the side phase of the tower head to calculate the electrical clearance of the side phase of the tower head.

[0010] The tower head structure parameters include the distance L from the suspension point of the transmission line to the center line of the tower head g , the distance L from the corner of the wine glass window to the center line of the tower head z , the included angle Φ0 between the cross arm and the tower window side, the included angle Φ1 between the cross arm and the horizontal direction, and the included angle Φ2 between the tower window side and the horizontal direction.

[0011] The wire parameters include wire type, number of wire splits, and wire split spacing.

[0012] The insulator parameters include insulator type and thickness of a single insulator.

[0013] The length of the side-phase string at the tower head is calculated based on insulation coordination and is the sum of the length of the fitting connecting the insulator and the wire and the length of the side-phase string at the tower head.

[0014] After importing the model parameters into the pre-built plane model of the side-phase I string at the tower head of the transmission tower, the calculation of the initial electrical clearance of the side-phase at the tower head based on the relationship between the side lengths and angles of a triangle includes:

[0015] Initial electrical clearance of the side-phase at the tower head is calculated as follows:

[0016] (1),

[0017] where is the distance from the wire to the corner of the tower crossarm, is the angle between the connection line between the wire and the corner of the tower crossarm and the tower window edge;

[0018] and are calculated as follows:

[0019] (2),

[0020] (3),

[0021] (4),

[0022] where is the arm length and θ1 is the wind deflection angle of the side-phase I string at the tower head.

[0023] Considering the influence of wire sag height, wire split spacing, and clearance margin, the formula for the initial electrical clearance of the side-phase at the tower head is corrected to obtain the formula for the corrected electrical clearance of the side-phase at the tower head, which includes:

[0024] (5),

[0025] where is the fitting length, is the wire sag height;

[0026] The corrected electrical clearance d of the side-phase at the tower head rs is calculated as:

[0027] (6),

[0028] Among them, is the conductor split spacing, is the clearance margin.

[0029] In a second aspect, the present invention provides a calculation device for the electrical clearance of the side phase of the tower head, including:

[0030] A data acquisition module, configured to acquire model parameters, the length of the side phase string of the tower head, and the wind deflection angle of the side phase I string of the tower head, where the model parameters include transmission line tower parameters, conductor parameters, and insulator parameters;

[0031] A side phase electrical clearance derivation module, configured to import the model parameters into a pre-constructed plane model of the side phase I string of the transmission tower head, and then derive an initial calculation formula for the electrical clearance of the side phase of the tower head according to the relationship between the side lengths and angles of a triangle;

[0032] A side phase electrical clearance correction module, configured to correct the initial calculation formula for the electrical clearance of the side phase of the tower head by considering the influence of the conductor sag height, the conductor split spacing, and the clearance margin to obtain a corrected calculation formula for the electrical clearance of the side phase of the tower head;

[0033] A side phase electrical clearance calculation module, configured to substitute the length of the side phase string of the tower head and the wind deflection angle of the side phase I string of the tower head into the corrected calculation formula for the electrical clearance of the side phase of the tower head to calculate the electrical clearance of the side phase of the tower head.

[0034] In a third aspect, the present invention provides a computer-readable storage medium, on which a computer program / instructions are stored, and when the computer program / instructions are executed by a processor, the above-mentioned method for calculating the electrical clearance of the side phase of the tower head is implemented.

[0035] Advantages of the present invention: The present invention provides a method, device, and storage medium for calculating the electrical clearance of the side phase of the tower head. After constructing a plane model of the side phase I string of the transmission tower head, considering the influence of the conductor sag height, the conductor split spacing, and the clearance margin, the initial calculation formula for the electrical clearance of the side phase of the tower head is corrected, which helps to quickly calculate the electrical clearance between the side phase I string conductor and the tower within the allowable error range, and provides a theoretical support for the verification of the insulation performance of the side phase of the transmission line tower. Description of the Drawings

[0036] Figure 1 is a flowchart of a method for calculating the electrical clearance of the side phase of the tower head according to the present invention;

[0037] Figure 2 is a diagram of the side phase model of the transmission tower head in the present invention. Detailed Embodiments

[0038] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0039] Embodiment 1

[0040] As Figure 1 shown, the present invention discloses a method for calculating the electrical clearance of the side phase of the tower head, including the following steps:

[0041] Step 1: Obtain the model parameters, the length of the side phase string of the tower head, and the wind deflection angle of the side phase I string of the tower head, where the model parameters include transmission line tower parameters, conductor parameters, and insulator parameters.

[0042] Step 2: After importing the model parameters into the pre-constructed plane model of the side phase I string of the transmission tower head, derive the initial formula for calculating the electrical clearance of the side phase of the tower head according to the relationship between the side lengths and angles of the triangle.

[0043] Step 3: Considering the influence of the conductor sag height, conductor split spacing, and clearance margin, correct the initial formula for calculating the electrical clearance of the side phase of the tower head to obtain the corrected formula for calculating the electrical clearance of the side phase of the tower head.

[0044] Step 4: Substitute the length of the side phase string of the tower head and the wind deflection angle of the side phase I string of the tower head into the corrected formula for calculating the electrical clearance of the side phase of the tower head to calculate the electrical clearance of the side phase of the tower head.

[0045] After constructing the plane model of the side phase I string of the transmission tower head, the present invention corrects the initial formula for calculating the electrical clearance of the side phase of the tower head considering the influence of the conductor sag height, conductor split spacing, and clearance margin, which helps to quickly calculate the electrical clearance between the conductor of the side phase I string and the tower within the allowable error range and provides a theoretical support for the verification of the insulation performance of the side phase of the transmission line tower.

[0046] Embodiment 2

[0047] As Figure 1 shown, the present invention discloses a method for calculating the electrical clearance of the side phase of the tower head, specifically including the following steps:

[0048] Step 1: Obtain the transmission line tower parameters, conductor parameters, and insulator parameters.

[0049] The present invention takes a wine glass tower in a certain project section as an example for analysis. The type of the transmission tower is ZB2311; the structural parameters of the tower head are as Figure 2 shown, the distance L g from the suspension point of the transmission line to the center line of the tower head is 19.5 m, and the distance L zIt is 9.95 m, the included angle Φ0 between the cross arm and the tower window side is 118°, the included angle Φ1 between the cross arm and the horizontal direction is 5°, and Φ2 is the included angle between the tower window side and the horizontal direction; the conductor model is ACSR LGJ-400 / 5, the number of conductor splits is six, and the conductor split spacing d is 0.5 m; the insulator model is CA-596EZ / A, and the thickness of a single insulator is 20.8 cm.

[0050] In addition, the present invention calculates the wind deflection angle of the side-phase I string at the tower head by clarifying the data on the operation conditions of the transmission line. The operation conditions of the transmission line include the operating voltage of the transmission line, the operating conditions of the transmission line, and the operating environment of the transmission line. Among them, the operating conditions of the transmission line include power frequency voltage, internal overvoltage, and external overvoltage. The operating environment includes terrain and meteorology. The terrain is divided into mountainous areas, plain areas, coastal areas, and plateau areas. Meteorology includes wind speed and temperature. The present invention sets the operating voltage of the transmission line to ±550 kV, the operating condition of the transmission line to internal overvoltage, the terrain to plain area, the wind speed to 31 m / s, the temperature to -30 °C, and the wind deflection angle θ1 of the side-phase I string is taken as 29.8°.

[0051] Finally, according to the length of the side-phase string at the tower head calculated by insulation coordination, the length of the side-phase string at the tower head is the sum of the length of the fitting connecting the insulator and the conductor and the length of the side-phase string at the tower head. The length L of the fitting connecting the insulator and the conductor c1 is 9.24 m; at the voltage level of ±550 kV, the effective length L of the insulator string is calculated to be c 7.59 m.

[0052] Step 2: Construct a plane model of the side-phase I string at the tower head of the transmission tower, and import model parameters such as transmission line tower parameters, conductor parameters, and insulator parameters. As Figure 2 shown, considering the influence of the conductor sag height L c2 , with the help of auxiliary lines, the electrical clearance d between the transmission line and the transmission tower is calculated according to the relationship between the side lengths and angles of the triangle r .

[0053] Among them: (1)

[0054] L f is the distance between the conductor and the cross-arm corner of the tower, is the included angle between the connection line between the conductor and the cross-arm corner of the tower and the tower window side.

[0055] Among them: (2)

[0056] (3)

[0057] (4)

[0058] Step 3: Considering the influence of conductor sag height, conductor split spacing and clearance margin, the initial calculation formula for the electrical clearance of the side phase of the tower head is corrected to obtain the corrected calculation formula for the electrical clearance of the side phase of the tower head.

[0059] (5)

[0060] To obtain results close to the true values, conductor split spacing and clearance margin should be considered during the calculation process. The electrical clearance d of the side phase rs The calculation formula is:

[0061] (6)

[0062] Among them, the conductor sag height L c2 is 0.4 m; the clearance margin d y is 0.35 m.

[0063] Step 4: Substitute the fitting length, the string length of the side phase of the tower head and the wind deflection angle of the I-string of the side phase of the tower head into the corrected calculation formula for the electrical clearance of the side phase of the tower head, and calculate the electrical clearance of the side phase of the tower head. According to the relationship between the side lengths and angles of a triangle, the electrical clearance of the side phase at the ±550 kV voltage level is calculated to be 6.80 m.

[0064] Example 3

[0065] This example discloses a device for calculating the electrical clearance of the side phase of a tower head, including:

[0066] A data acquisition module for acquiring model parameters, the string length of the side phase of the tower head and the wind deflection angle of the I-string of the side phase of the tower head, where the model parameters include transmission line tower parameters, conductor parameters and insulator parameters;

[0067] A side-phase electrical clearance derivation module for importing the model parameters into a pre-constructed plane model of the I-string of the side phase of the transmission tower head, and deriving the initial calculation formula for the electrical clearance of the side phase of the tower head according to the relationship between the side lengths and angles of a triangle;

[0068] A side-phase electrical clearance correction module for considering the influence of conductor sag height, conductor split spacing and clearance margin, and correcting the initial calculation formula for the electrical clearance of the side phase of the tower head to obtain the corrected calculation formula for the electrical clearance of the side phase of the tower head;

[0069] A side-phase electrical clearance calculation module for substituting the string length of the side phase of the tower head and the wind deflection angle of the I-string of the side phase of the tower head into the corrected calculation formula for the electrical clearance of the side phase of the tower head, and calculating the electrical clearance of the side phase of the tower head.

[0070] Example 4

[0071] This embodiment discloses a computer-readable storage medium, on which a computer program / instructions are stored. When the computer program / instructions are executed by a processor, the above-mentioned tower head side-phase electrical clearance calculation method is implemented.

[0072] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0073] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0074] These computer program instructions can also be loaded onto a computer or other programmable data processing devices, so that a series of operation steps are executed on the computer or other programmable devices to generate a computer-implemented process. Therefore, the instructions executed on the computer or other programmable devices provide steps for implementing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0075] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for calculating the electrical clearance between tower heads and phases, characterized in that: The following steps are involved: Obtaining model parameters, tower head side phase string length and tower head side phase I string wind deflection angle, wherein the model parameters include transmission line tower parameters, conductor parameters and insulator parameters; After the model parameters are imported into the pre-built transmission tower head side phase I string plane model, the initial tower head side phase electrical clearance calculation formula is derived based on the relationship between the triangle side length and angle; Considering the influence of conductor sag height, conductor splitting spacing and clearance margin, the initial tower head side phase electrical clearance calculation formula is modified to obtain the modified tower head side phase electrical clearance calculation formula; Substitute the tower head side phase string length and the tower head side phase I string wind deflection angle into the corrected tower head side phase electrical clearance calculation formula to calculate the tower head side phase electrical clearance.

2. The tower head side phase electrical clearance calculation method according to claim 1, characterized in that: The tower head structural parameters include the distance L from the suspension point of the transmission line to the center line of the tower head. g , the distance from the corner of the wine glass window to the center line of the tower head L z , the angle Φ0 between the cross arm and the tower window edge, the angle Φ1 between the cross arm and the horizontal direction, and the angle Φ2 between the tower window edge and the horizontal direction.

3. The tower head side phase electrical clearance calculation method according to claim 2 is characterized in that: The conductor parameters include the conductor model, the number of conductor splits and the conductor split spacing.

4. The tower head side phase electrical clearance calculation method according to claim 3 is characterized in that: The insulator parameters include the insulator model and the thickness of the single-piece insulator.

5. The tower head side phase electrical clearance calculation method according to claim 4 is characterized in that: The tower head side phase string length is calculated based on the insulation coordination, which is the sum of the length of the hardware connecting the insulator and the conductor and the tower head side phase string length.

6. The method for calculating the electrical clearance between the tower head and the side phase according to claim 5, characterized in that: After the model parameters are imported into the pre-built transmission tower head side phase I string plane model, the initial tower head side phase electrical clearance calculation formula is obtained by calculating according to the relationship between the triangle side length and angle, including: Initial tower head side phase electrical clearance The calculation method is: （1）， in, is the distance between the conductor and the cross arm corner of the tower, It is the angle between the line connecting the conductor and the cross arm corner of the tower and the edge of the tower window; and The calculation method is as follows: （2）， （3）， （4）， in, is the arm length, θ1 is the wind deflection angle of phase I at the tower head.

7. The tower head side phase electrical clearance calculation method according to claim 6 is characterized in that: The above-mentioned consideration of the influence of the conductor sag height, the conductor splitting spacing and the gap margin, the initial tower head side phase electrical clearance calculation formula is corrected to obtain the corrected tower head side phase electrical clearance calculation formula including: （5）， in is the length of the fitting, is the conductor sag height; Corrected electrical clearance d between tower head and side phases rs The calculation formula is: （6）， in, is the wire splitting spacing, is the clearance margin.

8. A tower head side phase electrical clearance calculation device, characterized in that: include: A data acquisition module is used to acquire model parameters, tower head side phase string length and tower head side phase I string wind deflection angle, wherein the model parameters include transmission line tower parameters, conductor parameters and insulator parameters; The side-phase electrical clearance derivation module is used to import the model parameters into the pre-built transmission tower head side-phase I string plane model, and derive the initial tower head side-phase electrical clearance calculation formula according to the relationship between the triangle side length and angle; The side-phase electrical clearance correction module is used to take into account the influence of the conductor sag height, the conductor splitting spacing and the clearance margin, and to correct the initial tower head side-phase electrical clearance calculation formula to obtain the corrected tower head side-phase electrical clearance calculation formula; The side phase electrical clearance calculation module is used to substitute the tower head side phase string length and the tower head side phase I string wind deflection angle into the corrected tower head side phase electrical clearance calculation formula to calculate the tower head side phase electrical clearance.

9. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instruction is executed by a processor, the tower head side phase electrical clearance calculation method described in any one of claims 1-7 is implemented.

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