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首页> 外文会议>IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization >Properties Estimation of Inhomogeneous Dispersive Materials by Electromagnetic Modeling and Dielectric Spectroscopy
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Properties Estimation of Inhomogeneous Dispersive Materials by Electromagnetic Modeling and Dielectric Spectroscopy

机译：电磁建模和介电光谱法均匀分散材料的特性估计

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An electroquasistatic numerical model of polyethylene insulation affected by water trees is proposed in this study. The model includes dispersive materials (polyethylene and water trees) having the properties set after processing experimental results obtained by dielectric spectroscopy in the frequency range 10~(-2)-10~6 Hz, combined with the usage of two semi-analytical models for effective permittivity of dielectric mixtures. The numerical model is implemented in the finite element method of the software package COMSOL Multiphysics. The solution of the proposed model was computed for all frequencies tested in dielectric spectroscopy measurements, and the effective permittivity (real part) and loss tangent as resulting from the numerical model were compared with the experimental ones. The modeling results are close to the experimental data, thus showing that the inverse problem approach proposed in this work leads to a good estimation of the frequency dependent behavior of dielectric inclusions, such as the water trees grown in polyethylene insulation.
机译：本研究提出了一种水树影响的聚乙烯绝缘材料的电Quisistatic数值模型。该模型包括具有在通过频率范围内的介电光谱法获得的实验结果之后设定的分散材料（聚乙烯和水树），其频率范围为10〜（2）-10〜6赫兹，结合使用两种半分析模型介电混合物的有效介电常数。数值模型以软件包COMSOL Multiphysics的有限元方法实现。计算所提出的模型的解决方案对于在介电光谱测量中测试的所有频率，以及由数值模型的有效介电常数（实际部分）和损耗与实验性的频率相切。建模结果接近实验数据，因此表明该工作中提出的逆问题方法导致介电夹杂物的频率依赖性行为的良好估计，例如在聚乙烯绝缘中生长的水树。

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