Accurately calculating the transmission‐line constants of underground cables and gas insulated bus (GIB) is important for various types of power system simulations. When calculating the transmission‐line constants of a three‐phase enclosure‐type GIB, the Cable Constants supporting routine of EMTP is usually used. However, this routine could cause numerical errors, since the proximity effect is ignored for the calculation of series impedances and shunt admittances. In this paper, a method for calculating the transmission‐line constants of a three‐phase enclosure‐type GIB considering the proximity effect is proposed. Then, series impedances and shunt admittances are accurately calculated by the method of moments with a surface admittance operator (MoM‐SO) and method of moments (MoM), respectively. In this paper, the proposed method is verified by experiments using the small‐scale model of a three‐phase enclosure‐type GIB. Calculated results obtained by the proposed method agree well with the measured results.

中文翻译：

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考虑到邻近效应，开发了一种计算三相封闭式气体绝缘母线的传输线常数的方法

准确计算地下电缆和气体绝缘母线（GIB）的传输线常数对于各种类型的电力系统仿真非常重要。在计算三相外壳式GIB的传输线常数时，通常使用EMTP的电缆常数支持例程。但是，此例程可能会导致数值误差，因为在计算串联阻抗和并联导纳时会忽略邻近效应。本文提出了一种考虑邻近效应的三相封闭式GIB的传输线常数的计算方法。然后，分别使用表面导纳算符（MoM-SO）和矩量法（MoM）分别通过矩量法精确地计算出串联阻抗和分流导纳。在本文中，通过使用三相封闭式GIB的小规模模型进行实验，验证了该方法的有效性。所提方法得到的计算结果与实测结果吻合良好。