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The skin effect is characterized by a reduction of a conductor's effective cross-sectional area and is of great importance for the losses in electrical interconnection systems. Many well-known solutions exist for its modeling in the frequency domain. Based on the method of full spectrum convolution macromodeling a new skin-effect model is developed for an efficient numerical time-domain analysis. The integration of this model into the transmission line model and into the PEEC model is studied in two examples. Thereby the influence of skin effect on the simulation of interconnection systems with transient current and voltage responses is investigated.