Unlock instant, AI-driven research and patent intelligence for your innovation.
A method for calculating the internal space charge distribution of XLPE cables using electromagnetic theory
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A cross-linked polyethylene, charge distribution technology, applied in the direction of measuring electrical variables, instruments, measuring devices, etc., to achieve cost-saving effects
Active Publication Date: 2019-06-18
CHINA THREE GORGES UNIV
View PDF3 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More 
