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Finite element calculation method for temperature fields of multiple cross-linked polyethylene insulated cables during trench sharing

A cross-linked polyethylene, insulated cable technology, applied in the field of power cables, can solve the problems of large amount of calculation, poor adaptability to complex areas, and many boundaries of boundary element method, achieve high calculation accuracy, improve the distribution structure of cable trenches, and calculate speed. quick effect

Inactive Publication Date: 2017-11-03
STATE GRID HUBEI ELECTRIC POWER CO LTD WUHAN POWER SUPPLY CO +1
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Problems solved by technology

The finite difference method has a major disadvantage: poor adaptability to complex regions and the conservation of numerical solutions is difficult to guarantee
However, there is a gap in accuracy between the finite difference method and the finite element method.
When dealing with a real cable trench problem with multiple layers of soil or with multiple cable laying problems, the boundary element method has too many and complex boundaries and is computationally expensive

Method used

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  • Finite element calculation method for temperature fields of multiple cross-linked polyethylene insulated cables during trench sharing
  • Finite element calculation method for temperature fields of multiple cross-linked polyethylene insulated cables during trench sharing
  • Finite element calculation method for temperature fields of multiple cross-linked polyethylene insulated cables during trench sharing

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specific Embodiment approach

[0037] Below will further illustrate the specific embodiment of the present invention in conjunction with accompanying drawing, concrete steps are as follows:

[0038] A, the 10kV model is YJV22-8.7 / 15-3*240mm 2 The XLPE armored three-core power cable is the research object, and the relevant parameters of the cable are calculated based on the IEC 60287 standard. For the structure of the cable see figure 1 , the three conductors are respectively insulated and wrapped in the armor layer 8, and the outer sheath 9 is wrapped outside. The specific parameters of the cable body are shown in Table 1.

[0039] Table 1 Dimensional parameters of the three-core cable body

[0040]

[0041] The calculation of the relevant parameters of the cable is as follows:

[0042] (1) Calculation of AC resistance of cable conductor

[0043] The cable conductor is located in the innermost layer of the cable structure, i.e. figure 1 The neutral wire core 1 is used to transfer current. The AC r...

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Abstract

The invention discloses a finite element calculation method for temperature fields of multiple cross-linked polyethylene insulated cables during trench sharing. The method comprises the steps of 1, calculating related parameters of the cross-linked polyethylene insulated cables; 2, building a cable model; 3, building a trench sharing model and a cable trench temperature field calculation model of the cross-linked polyethylene insulated cables; and 4, according to the related parameters, obtaining heating loss of a unit-length unit-area lead wire core, heating loss of an insulation medium and heating loss of an armor layer, loading the heating losses to the polyethylene insulated cables in the cable trench temperature field calculation model to serve as heat sources of the polyethylene insulated cables to perform temperature field analysis, and calculating the temperature fields of the polyethylene insulated cables. Compared with a conventional method for calculating the temperature fields by utilizing IEC-60287 standards, the finite element calculation method has the advantages of high calculation speed and high calculation precision, and can calculate a distribution condition of the temperature fields under the condition more accurately.

Description

technical field [0001] The invention relates to the technical field of power cables, in particular to a finite element calculation method for a temperature field when a plurality of cross-linked polyethylene insulated cables share a common trench. Background technique [0002] With the wide application of power cables in power transmission and distribution lines, society's requirements for power transmission reliability continue to increase. In modern urban transmission and distribution networks, XLPE power cables are widely used. Among them, the cable trench laying method has the advantages of high reliability, low investment, less land occupation, flexible direction and can accommodate more cables, increase the number of cable loops, no need for manholes, and convenient cable access, etc., and is widely used in urban transmission and distribution networks. , and the cable cluster laying in the cable trench is very common. In order to ensure the safe and stable operation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2113/16
Inventor 田智鲍玉川王昕夏湛然李秋芳周承科程萌姚星辰李鹏郭鹏杨斌孙长群荣爽王航李明贞
Owner STATE GRID HUBEI ELECTRIC POWER CO LTD WUHAN POWER SUPPLY CO
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