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Finite element-based mining XLPE cable current leakage dynamic analysis method

A leakage current and analysis method technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as gaps, and achieve accurate calculation, convenient solution, and simple operation

Active Publication Date: 2017-12-22
TAIYUAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, the above model does not involve the cable leakage current, and the cable parameters are fixed parameters, which are different from the actual cables.

Method used

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  • Finite element-based mining XLPE cable current leakage dynamic analysis method
  • Finite element-based mining XLPE cable current leakage dynamic analysis method
  • Finite element-based mining XLPE cable current leakage dynamic analysis method

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Embodiment Construction

[0030] specific implementation plan

[0031] Because the temperature and electric field of the cable during operation are different at different insulations, and the parameters of the cable insulation such as DC conductance and complex dielectric constant change with temperature, electric field, frequency and other factors. Therefore, the equivalent resistance and capacitance of the cable insulation to the ground will be affected by the operating state. In order to analyze the cable leakage current response under different operating conditions, it is necessary to build a cable model under the action of electrothermal coupling.

[0032] The method for dynamic analysis of leakage current of mining XLPE cables involved in the present invention will be described in detail below in conjunction with the accompanying drawings and implementation cases.

[0033] Implement the mine XLPE cable leakage current dynamic analysis method based on finite element provided by the present invent...

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Abstract

A finite element-based mining XLPE cable current leakage dynamic analysis method is provided. The method comprises steps of establishing a cable geometric model with a combination of a mining high-voltage cable structure hung on a metal anchoring net and by the use of COMSOL finite element analyzing software, conducting dielectric spectrum measurement to an XLPE sample to obtain dielectric parameters of the same, fitting the measurement result to achieve numerical relationships between the XLPE dielectric parameters and the temperature, and electric field frequency, then substituting each part material parameter of the cable, arranging an initial condition, conducting mesh division, and conducting simulation calculation to a cable electric field, a thermal field and leakage current, and exploring rules of the leakage current changing with a load factor and the electric field frequency. The method provides theoretical foundation for detection and prevention of cable current leakage.

Description

technical field [0001] The invention relates to a method for analyzing the leakage current of an XLPE cable, in particular to a method for dynamically analyzing the leakage current of a mining XLPE cable based on finite elements. technical background [0002] Due to the special production environment of coal mines, the gas concentration is extremely high, and it is very easy to cause gas combustion and explosion accidents due to fire source problems. According to statistics, in my country's coal mine electromechanical accidents, explosion accidents caused by electric sparks account for 40%-50%, and fire and explosion accidents caused by mismanagement of stray currents account for 25%-35% of these faults. At present, the cable is the most important facility for power transmission and distribution in the underground, and the AC leakage current is an inevitable product in the process of cable transmission of power, and is an important part of the AC stray current, and it increa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 耿蒲龙杜亚昆宋建成田慕琴庞丹
Owner TAIYUAN UNIV OF TECH
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