Light emitting diode and manufacturing method thereof

Abstract

This invention provides a method for optimizing the structure of lightning protection insulators based on surface electric field characteristics, comprising: S1. Modeling the target lightning protection insulator using Solidworks software, wherein the size ratio of the established target lightning protection insulator model to the actual target lightning protection insulator is 1:1; S2. Meshing the target lightning protection insulator model using a local refinement algorithm; S3. Determining the input parameters of the target lightning protection insulator, including rated voltage, metal electrode material, silicone shed material, and zinc oxide valve plate material; S4. Inputting the input parameters of the target lightning protection insulator into the finite element electric field calculation model to calculate indices, including the maximum electric field E along the surface of the insulation section. 1max The maximum electric field E on the surface of the disc electrode 2max The maximum electric field E on the surface of the spherical electrode 3max And determine the coefficient of electric field non-uniformity ξ along the surface of the insulation section. E And the ratio R1 of the maximum electric field value along the surface of the protective electrode and the insulation section; S5. Determine the comprehensive index β1; S6. Determine whether the comprehensive index β1 meets the set index threshold. If so, manufacture according to the predetermined size of the current target insulator. Otherwise, adjust the weight of each index in the comprehensive index β1 calculation model, and adjust the diameter of the spherical electrode, the diameter of the disc electrode, the distance of the protective gap and the extension length of the shed, and return to step S1.

Description

Technical Field

[0001] This invention relates to an insulator structure optimization method, and more particularly to a lightning protection insulator structure optimization method based on surface electric field characteristics. Background Technology

[0002] Lightning protection insulators are widely used in power transmission networks, and the performance analysis of lightning protection insulators is crucial to the stable and reliable operation of power transmission networks.

[0003] However, due to severe atmospheric pollution, flashover accidents involving lightning protection insulators are increasingly frequent and widespread, posing serious safety hazards and economic losses to the power transmission network. Besides these serious pollution flashover accidents, lightning strikes are another major problem for lightning protection insulators. Each year, lightning-induced flashover trips on high-voltage transmission lines account for approximately 65%-75% of trips caused by natural factors (such as air pollution). Lightning protection remains a difficult problem for the power grid. While the lightning tripping rate has decreased significantly with advancements in lightning protection technology, lightning accidents persist and continue to seriously endanger the power system.

[0004] Current technologies primarily employ surge arresters and lightning protection hardware to improve the lightning protection level of power lines. However, installing surge arresters presents drawbacks such as high installation difficulty and construction costs. Furthermore, the insulation coordination between surge arresters and insulators must be considered. This is crucial to prevent maloperation under power frequency and switching overvoltages, protecting the arrester; and to ensure the surge arrester's lightning impulse discharge voltage is lower than that of the insulator, thus providing protection. Due to the significant dispersion (over 20%) of the 50% lightning impulse volt-second characteristics of insulators and surge arresters, the issue of surge arrester insulation coordination is particularly prominent. Regarding lightning protection hardware, its protective effect is only realized when every tower is fully equipped with it, and it is essential to ensure that the tower's grounding device is in good condition and the grounding resistance is qualified. In practice, this presents disadvantages such as phase-to-phase breakdown and difficulty in extinguishing arcs.

[0005] Therefore, in order to solve the above-mentioned technical problems, it is urgent to propose a new technical approach. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a method for optimizing the structure of lightning protection insulators based on surface electric field characteristics. This method can reasonably optimize the protective electrode, protective gap distance, and shed extension length of the lightning protection insulator, thereby effectively guiding the development of lightning arcs, effectively reducing the damage of lightning strikes to lightning protection insulators, avoiding the defects existing in traditional technologies, making it easier to implement, and at a low cost.

[0007] This invention provides a method for optimizing the structure of lightning protection insulators based on surface electric field characteristics, comprising the following steps:

[0008] S1. Based on the target lightning protection insulator, Solidworks software is used to model it. The size ratio of the model of the target lightning protection insulator to the actual target lightning protection insulator is 1:1.

[0009] S2. The model of the target lightning protection insulator is meshed using a local refinement algorithm;

[0010] S3. Determine the input parameters of the target lightning protection insulator, including rated voltage, metal electrode material, silicone skirt material, and zinc oxide valve plate material;

[0011] S4. Input the input parameters of the target lightning protection insulator into the finite element electric field calculation model to calculate the index, including the maximum electric field E along the surface of the insulation section. 1max The maximum electric field E on the surface of the disc electrode 2max The maximum electric field E on the surface of the spherical electrode 3max And determine the coefficient of electric field non-uniformity ξ along the surface of the insulation section. E And the ratio R1 between the maximum electric field value along the surface of the protective electrode and the insulating section;

[0012] S5. Determine the comprehensive index β1: β1 = α1E 1max +α2E 2max +α3E 3max +α4ξ E +α5R1, where α1 to α5 are the weights of the corresponding indicators;

[0013] S6. Determine whether the comprehensive index β1 meets the set index threshold. If so, manufacture according to the predetermined size of the current target insulator. Otherwise, adjust the weight of each index in the comprehensive index β1 calculation model, and adjust the diameter of the spherical electrode, the diameter of the disc electrode, the distance of the protective gap, and the extension length of the shed, and return to step S1.

[0014] Furthermore, in step S4, the non-uniformity coefficient ξ of the electric field along the surface of the insulation section is determined according to the following method. E :

[0015] Among them: E 1i E represents the electric field value at point i in the computational domain along the surface of the insulation section; 1av is the average electric field value of all points in the calculation domain along the surface of the insulation section, and n is the total number of points for calculating the electric field along the surface of the insulation section.

[0016] Furthermore, in step S4, the ratio R1 of the maximum electric field value along the surface of the protective electrode and the insulating section is determined according to the following method:

[0017]

[0018] The beneficial effects of this invention are as follows: This invention enables reasonable optimization of the protective electrode, protective gap distance, and shed extension length of lightning protection insulators, thereby effectively guiding the development of lightning arcs, effectively reducing the damage of lightning strikes to lightning protection insulators, avoiding the defects existing in traditional technologies, making it easier to implement, and at a low cost. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a flowchart of the present invention.

[0021] Figure 2 This is a schematic diagram of a lightning protection insulator structure. Detailed Implementation

[0022] The present invention will be further described in detail below:

[0023] This invention provides a method for optimizing the structure of lightning protection insulators based on surface electric field characteristics, comprising the following steps:

[0024] S1. Based on the target lightning protection insulator, Solidworks software is used to model it. The size ratio of the model of the target lightning protection insulator to the actual target lightning protection insulator is 1:1.

[0025] S2. The model of the target lightning protection insulator is divided into meshes using a local densification algorithm, that is, the surface of the insulator model is divided into several meshes, which facilitates marking. Each mesh is used as an electric field calculation point. The local densification algorithm is existing technology and will not be described in detail here.

[0026] S3. Determine the input parameters of the target lightning protection insulator, including rated voltage, metal electrode material, silicone skirt material, and zinc oxide valve plate material;

[0027] S4. Input the input parameters of the target lightning protection insulator into the finite element electric field calculation model to calculate the index, including the maximum electric field E along the surface of the insulation section. 1max The maximum electric field E on the surface of the disc electrode 2max The maximum electric field E on the surface of the spherical electrode 3max And determine the coefficient of electric field non-uniformity ξ along the surface of the insulation section. E And the ratio R1 of the maximum electric field value along the surface of the protective electrode and the insulating section; where the finite element electric field calculation model is existing technology and will not be described in detail here;

[0028] S5. Determine the comprehensive index β1: β1 = α1E 1max +α2E 2max +α3E 3max +α4ξE +α5R1, where α1 to α5 are the weights of the corresponding indicators;

[0029] S6. Determine whether the comprehensive index β1 meets the set index threshold, where the index threshold is set based on actual working conditions and experience. If yes, manufacture according to the predetermined size of the current target insulator; otherwise, adjust the weights of each index in the comprehensive index β1 calculation model, and adjust the diameter of the spherical electrode, the diameter of the disc electrode, the protective gap distance, and the shed extension length. Figure 2 As shown: 1 represents the disc electrode of the lightning protection insulator, 2 represents the shed of the lightning protection insulator, 3 represents the spherical electrode of the lightning protection insulator, d is the protective gap distance, and D is the diameter of the spherical insulator; and returning to step S1, through the above method, the protective electrode, protective gap distance, and shed extension length of the lightning protection insulator can be reasonably optimized, thereby effectively guiding the development of the lightning arc, effectively reducing the damage of lightning impact to the lightning protection insulator, avoiding the defects existing in traditional technology, making it more convenient to implement, and at a low cost.

[0030] In this embodiment, in step S4, the non-uniformity coefficient ξ of the electric field along the surface of the insulation section is determined according to the following method. E :

[0031] Among them: E 1i E represents the electric field value at point i in the computational domain along the surface of the insulation section; 1av is the average electric field value of all points in the calculation domain along the surface of the insulation section, and n is the total number of points for calculating the electric field along the surface of the insulation section.

[0032] In this embodiment, in step S4, the ratio R1 of the maximum electric field value along the surface of the protective electrode and the insulating section is determined according to the following method:

[0033] Among them, the protective electrode is a general term for spherical electrodes and disc-shaped electrodes.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for optimizing the structure of lightning protection insulators based on surface electric field characteristics, characterized in that: Includes the following steps: S1. Based on the target lightning protection insulator, Solidworks software is used to model it. The size ratio of the model of the target lightning protection insulator to the actual target lightning protection insulator is 1:

1. S2. The model of the target lightning protection insulator is meshed using a local refinement algorithm; S3. Determine the input parameters of the target lightning protection insulator, including rated voltage, metal electrode material, silicone skirt material, and zinc oxide valve plate material; S4. Input the input parameters of the target lightning protection insulator into the finite element electric field calculation model to calculate the index, including the maximum electric field E along the surface of the insulation section. 1max The maximum electric field E on the surface of the disc electrode 2max The maximum electric field E on the surface of the spherical electrode 3max And determine the coefficient of electric field non-uniformity ξ along the surface of the insulation section. E And the ratio R1 between the maximum electric field value along the surface of the protective electrode and the insulating section; S5. Determine the comprehensive index β1: β1 = α1E 1max +α2E 2max +α3E 3max +α4ξ E +α5R1, where α1 to α5 are the weights of the corresponding indicators; S6. Determine whether the comprehensive index β1 meets the set index threshold. If so, manufacture according to the predetermined size of the current target insulator. Otherwise, adjust the weight of each index in the comprehensive index β1 calculation model, and adjust the diameter of the spherical electrode, the diameter of the disc electrode, the distance of the protective gap, and the extension length of the shed, and return to step S1.

2. The method for optimizing lightning protection insulator structure based on surface electric field characteristics according to claim 1, characterized in that: In step S4, the non-uniformity coefficient ξ of the electric field along the surface of the insulation section is determined according to the following method. E : Among them: E 1i E represents the electric field value at point i in the computational domain along the surface of the insulation section; 1av is the average electric field value of all points in the calculation domain along the surface of the insulation section, and n is the total number of points for calculating the electric field along the surface of the insulation section.

3. The method for optimizing the structure of lightning protection insulators based on surface electric field characteristics according to claim 1, characterized in that: In step S4, the ratio R1 between the maximum electric field value along the surface of the protective electrode and the insulating section is determined according to the following method:

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