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Method of calculating internal space charge distribution in cross-linked polyethylene cable by means of electromagnetic theory

A technology of cross-linked polyethylene and charge distribution, which is applied in the direction of measuring electrical variables, measuring devices, instruments, etc., to achieve the effect of cost saving

Active Publication Date: 2017-08-11
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the technical problem to be solved by the present invention is: in view of the current lack of theoretical calculation methods to calculate the space charge distribution inside the XLPE cable, a method for calculating the space charge distribution inside the XLPE cable using electromagnetic theory is proposed. method

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  • Method of calculating internal space charge distribution in cross-linked polyethylene cable by means of electromagnetic theory
  • Method of calculating internal space charge distribution in cross-linked polyethylene cable by means of electromagnetic theory
  • Method of calculating internal space charge distribution in cross-linked polyethylene cable by means of electromagnetic theory

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Embodiment 1

[0019] A method for calculating the space charge distribution inside a cross-linked polyethylene cable with electromagnetic theory, comprising the following steps:

[0020] Step 1: Use the finite element analysis software to establish the cable model, use the second-order tetrahedron element to divide, apply the corresponding load to calculate the potential of each node, and export the node file, element file and potential file.

[0021] Step 2: According to the geometric characteristics of the three-dimensional tetrahedron unit, the volume coordinates are introduced as natural coordinates, such as figure 1 As shown, the volume coordinates of any point P(x, y, z) in the unit is:

[0022]

[0023] In the formula, L1, L2, L3, and L4 respectively represent the shape functions of the four vertices of the first-order tetrahedron, and vol represents the volume of the tetrahedron.

[0024]

[0025]

[0026]

[0027] Therefore there is L 1 +L 2 +L 3 +L 4 =1, the verte...

Embodiment 2

[0049] A method for calculating the space charge distribution inside a cross-linked polyethylene cable with electromagnetic theory, comprising the following steps:

[0050] Step 1: Use the finite element analysis software to establish the cable model, use the second-order hexahedron element division, apply the corresponding load to calculate the potential of each node, and export the node file, element file and potential file;

[0051] Step 2: Introduce three natural coordinates ξ, η, ζ, such as figure 2 As shown, ξ represents the ratio of any point on the ξ axis to the distance between the origin and half the length of the hexahedron, η represents the ratio of any point on the η axis to the distance from the origin to half the width of the hexahedron, and ζ represents the distance between any point on the ζ axis and the origin and The ratio of half of the height of the hexahedron, so the variation range of ξ, η, ζ is:

[0052] -1≤ξ≤1

[0053] -1≤η≤1

[0054] -1≤ζ≤1

[00...

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Abstract

The invention relates to a method of calculating internal space charge distribution in a cross-linked polyethylene cable by means of an electromagnetic theory. The method of calculating internal space charge distribution in a cross-linked polyethylene cable by means of an electromagnetic theory includes the steps: using finite element analysis software to establish a cable model; utilizing a second order tetrahedron or hexahedron unit to perform dissection, and applying the corresponding load to calculate the potential of each node; performing antigradient operation on the potential of each node to obtain the electric field intensity of each node; and finally according to the electric field intensity, calculating the electric displacement vector, and obtaining the charge density of each node by performing divergence solution on the electric displacement vector. Compared with the current commonly used measuring method, the method of calculating internal space charge distribution in cross-linked polyethylene cable by means of electromagnetic theory has the advantages of having no loss, saving the cost, and being simple and easy. The method of calculating internal space charge distribution in a cross-linked polyethylene cable by means of an electromagnetic theory is suitable for distribution calculation of space charge accumulation, caused by the situation that impurities and bubbles exist in the cable, thus having great significance for judgment of the elevator fault and the service life.

Description

technical field [0001] The invention discloses a method for calculating the space charge distribution inside a cross-linked polyethylene cable by using electromagnetic theory, and relates to the fields of high-voltage power transmission and electrical equipment insulation aging. Background technique [0002] Power cables are important equipment for power transmission. Because the laying area of ​​the power cable is small, it is suitable to be buried underground, and it is widely used in the construction of urban power grids. With the rapid development of urbanization in China, the use of power cables will be huge in the future, and the safety of power cables will become very important. However, the aging and breakdown of XLPE cables are a big problem that plagues people. The space charge distribution inside the insulating material has a great influence on the electrical properties of the dielectric. The space charge will cause the distortion distribution of the electric fi...

Claims

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Application Information

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IPC IPC(8): G01R29/24
CPCG01R29/24
Inventor 李亚莎代亚平花旭沈星如
Owner CHINA THREE GORGES UNIV
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