Thermal analysis for determination of current carrying capacity of PE and XLPE insulated power cables using finite element method

Proceedings of the 12th IEEE Mediterranean Electrotechnical Conference (IEEE Cat. No.04CH37521) Pub Date : 2004-05-12 DOI:10.1109/MELCON.2004.1348103

I. Kocar, A. Ertas

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引用次数: 20

Abstract

Transient heat transfer analysis of medium voltage, PE and XLPE insulated underground power cables are investigated by applying finite element modeling developed under a finite element software utilizing principle of virtual temperatures which is the quadratic functional form of the variational formulation of the transient heat transfer equation. Obtained results are compared with and verified by experimental heat transfer data for PE insulated cable. In order to minimize the truncation error arising from the boundary condition choice, two different boundary conditions for the selected boundaries namely Dirichlet and Neumann conditions are applied for different domain dimensions, and, it is shown that appropriate solution domain can be obtained. Then, PE and XLPE insulated cables are compared from the heat transfer point of view. Cable temperature dependency to variations in thermal conductivity of the surrounding medium and loading is investigated. Thus, correction factors given by cable manufacturers regarding cable current carrying capacity are obtained by using the finite element model developed in this study.

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用有限元法测定聚乙烯和交联聚乙烯绝缘电力电缆载流能力的热分析

利用虚拟温度原理，利用变分方程的二次泛函数形式，在有限元软件中建立有限元模型，对中压、聚乙烯和交联聚乙烯绝缘地下电力电缆进行了瞬态传热分析。将所得结果与PE绝缘电缆的实验传热数据进行了比较和验证。为了使边界条件选择引起的截断误差最小，对所选择的边界分别应用Dirichlet条件和Neumann条件两种不同的边界条件，对不同的域维数进行求解，得到了合适的解域。然后，从传热的角度对PE和交联PE绝缘电缆进行了比较。电缆温度对周围介质导热系数和载荷变化的依赖性进行了研究。因此，利用本文建立的有限元模型，得到电缆制造商给出的电缆载流能力修正系数。

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Proceedings of the 12th IEEE Mediterranean Electrotechnical Conference (IEEE Cat. No.04CH37521)

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