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Cable buckling modeling method

A cable and analysis method technology, applied in the field of ring network cable power supply, can solve problems without theoretical calculations

Active Publication Date: 2017-06-23
CHINA THREE GORGES UNIV
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Problems solved by technology

But they are all subjective viewpoints based on experience, without objective theoretical calculations.

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Embodiment

[0049] A modeling method for cable buckling. First, the finite element theoretical analysis of the cable core is carried out, such as figure 1 As shown, the original entire cable core wire is divided into nodes according to the changing nature of the geometric shape, decomposed into small units, and the corresponding stiffness matrix is ​​constructed, and the balance relation equation is established by using the principle of virtual displacement.

[0050] When the cable core wire is connected to the ring network cabinet, the outer sheath and copper shielding have been stripped, and the semiconductive layer inside and outside the main insulation is also very thin and the soft material has very little effect on the bending deformation of the cable, which can be ignored. Therefore, the cable core material is mainly composed of aluminum stranded wire and cross-linked polyethylene (XLPE), and the model is ZRYJLV22-8.7 / 10-3x240mm 2 The 10kV aluminum core power cable is modeled in th...

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Abstract

The invention discloses a cable buckling modeling method. The modeling method comprises the steps of performing node division on an original whole cable core wire according to a change property of a geometric shape; decomposing the cable core wire into small units; constructing a corresponding stiffness matrix; and establishing a balance relationship by adopting a virtual displacement principle. Any point P is obtained in the cable core wire, and a tiny parallelepiped is cut, wherein the edge lengths in x, y and z directions are dx, dy and dz respectively. Firstly, a straight line for connecting the centers of the front and back surfaces of the hexahedron is taken as a moment axis; a balance equation sigma Mee'=0 of moments is listed out; and two similar equations are obtained according to the rest of two balance equations sigma Fy=0 and sigma Fz=0. According to the modeling method, a buckling stress generated during excessive cutting of cable wire cores with different lengths based on ANSYS finite element software is simulated, an influence law of core wire length on casing stress is analyzed, a simulation result shows that the casing stress is remarkably reduced with increment of the cable wire core length, and a reasonable casing height is given. A theoretical basis is provided for reasonable design and installation of a cable terminal of a ring main unit.

Description

technical field [0001] The invention relates to the technical field of ring network cable power supply, in particular to a modeling method for cable buckling. Background technique [0002] Ring network power supply technology can greatly improve the reliability and stability of power supply, so it is increasingly concerned and applied in the transformation of power grids in various cities. At the same time, ring network cabinets are small in size, easy to install and maintain, and have low operating costs when in use. And other characteristics have also been widely used. However, most of the current ring network cabinets use European style. In Europe, single-core cables are usually used for power cables. When connecting to the ring network cabinet, the length of each phase is easy to adjust and easy to install. In the domestic distribution network, the power cable usually uses a three-core cable. Since the three-core cable is fixed on a cable clamp when connected to the rin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2113/16G06F2119/06
Inventor 潘明龙晋贞贞
Owner CHINA THREE GORGES UNIV
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