This article proposes a general physics-based model for identifying the parasitic capacitance in medium-voltage (MV) filter inductors, which can provide analytical calculations without using empirical equations and is not restricted by the geometrical structures of inductors. The elementary capacitances of the MV inductor are identified, then the equivalent capacitances between the two terminals of the inductor are derived under different voltage potential on the core. Further, a three-terminal equivalent circuit, instead of the conventional two-terminal equivalent circuit, is proposed by using the derived capacitances. Thus, the parasitic equivalent capacitance between the terminals and the core are explicitly quantified. Experimental measurements for parasitic capacitances show a good agreement with the theoretical calculations.

中文翻译：

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基于物理的中压滤波电感器寄生电容建模

本文提出了一种基于物理的通用模型，用于识别中压 (MV) 滤波电感器中的寄生电容，该模型无需使用经验方程即可提供解析计算，并且不受电感器几何结构的限制。确定了中压电感的基本电容，然后推导出在铁芯上不同电压电位下电感两端的等效电容。此外，通过使用导出的电容，提出了三端等效电路，而不是传统的二端等效电路。因此，端子和核心之间的寄生等效电容被明确量化。寄生电容的实验测量结果与理论计算非常吻合。