Electrical tree numerical simulation method and system in polymer insulating material

Abstract

The invention provides an electrical tree numerical simulation method and system in a polymer insulating material. The method comprises the following steps: dividing a sample into a plurality of grids in the needle tip direction of an electrode structure for discharging and the length direction of the sample; and selecting a set grid from the plurality of grids to form a micro-region so as to divide the sample into a plurality of micro-regions. Under the action of voltage, electrons injected from a needle tip increase the bond percolation probability of a micro-region and impact of hot electrons on a polymer molecular chain to jointly trigger electric branches to form an insulation failure region; impact of high-energy electrons in the adjacent micro-regions further determines the growth direction of the electrical tree so as to simulate initiation and growth of the electrical tree. The probability of bond percolation in each micro-region is judged only according to the applied voltage value, and the obtained numerical simulation result is more accurate.

Description

technical field

[0001] The disclosure belongs to the technical field of numerical simulation of electrical dendrites, and in particular relates to a method and system for numerical simulation of electrical dendrites in polymer insulating materials. Background technique

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] Electric dendrites in polymer insulating materials such as XLPE are electrical cracks formed by microscopic defects such as burrs, air gaps, and impurities inside the dielectric under lightning or operating overvoltage, and may eventually form discharge channels inside the dielectric, resulting in dielectric failure. And a breakdown accident occurs.

[0004] With the increase of urban cable rate and the expansion of XLPE cables towards high voltage and ultra-high voltage, the insulation status of XLPE cables is directly related to its safe and st...

Examples

Embodiment 1

[0045] This embodiment discloses a method for numerical simulation of electrical dendrites in polymer insulating materials. In order to illustrate the above, firstly, the simulation structure diagram of electrical dendrites is described, as shown in figure 2 shown. For the convenience of verifying the numerical simulation results of this patent, the literature "Champion J V, Dodd S J, Stevens G C. Analysis and modeling of electrical tree growth in synthetic resins over a wide range of stressing voltage. JPhys. D Appl. Phys. 1994, 27 , 1020-1030" of the experimental data in the simulation analysis, the electrode structure and dielectric used for discharge such as figure 2 As shown in (a), the dielectric is epoxy resin CY1311, and its length, width and height are 4mm; the stainless steel needle electrode is selected according to the national standard GB / T 4240 "Stainless Steel Wire", the diameter of the needle body is 0.18cm, and the radius of curvature of the needle tip is 3...

Embodiment 2

[0082] The purpose of this embodiment is to provide a computing device, which includes a memory, a processor, and a computer program stored in the memory and operable on the processor, and the processor implements the steps of the above method when executing the program.

Embodiment 3

[0084] The purpose of this embodiment is to provide a computer-readable storage medium.

[0085] A computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the above-mentioned method are executed.

technical field

[0001] The disclosure belongs to the technical field of numerical simulation of electrical dendrites, and in particular relates to a method and system for numerical simulation of electrical dendrites in polymer insulating materials. Background technique

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] Electric dendrites in polymer insulating materials such as XLPE are electrical cracks formed by microscopic defects such as burrs, air gaps, and impurities inside the dielectric under lightning or operating overvoltage, and may eventually form discharge channels inside the dielectric, resulting in dielectric failure. And a breakdown accident occurs.

[0004] With the increase of urban cable rate and the expansion of XLPE cables towards high voltage and ultra-high voltage, the insulation status of XLPE cables is directly related to its safe and st...

Examples

Embodiment 1

[0045] This embodiment discloses a method for numerical simulation of electrical dendrites in polymer insulating materials. In order to illustrate the above, firstly, the simulation structure diagram of electrical dendrites is described, as shown in figure 2 shown. For the convenience of verifying the numerical simulation results of this patent, the literature "Champion J V, Dodd S J, Stevens G C. Analysis and modeling of electrical tree growth in synthetic resins over a wide range of stressing voltage. JPhys. D Appl. Phys. 1994, 27 , 1020-1030" of the experimental data in the simulation analysis, the electrode structure and dielectric used for discharge such as figure 2 As shown in (a), the dielectric is epoxy resin CY1311, and its length, width and height are 4mm; the stainless steel needle electrode is selected according to the national standard GB / T 4240 "Stainless Steel Wire", the diameter of the needle body is 0.18cm, and the radius of curvature of the needle tip is 3...

Embodiment 2

[0082] The purpose of this embodiment is to provide a computing device, which includes a memory, a processor, and a computer program stored in the memory and operable on the processor, and the processor implements the steps of the above method when executing the program.

Embodiment 3

[0084] The purpose of this embodiment is to provide a computer-readable storage medium.

[0085] A computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the above-mentioned method are executed.

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