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We present an efficient numerical technique for calculating the series impedance matrix of systems with round conductors. The method is based on a surface admittance operator in combination with the method of moments and it accurately predicts skin and proximity effects. The application to a three-phase armored cable with wire screens demonstrates a speedup by a factor of about 100 compared to a finite-elements computation. The inclusion of proximity effect, in combination with the high efficiency, makes the new method very attractive for cable modeling within Electromagnetic Transients Program-type simulation tools. Currently, these tools can only take skin effect into account.

An Equivalent Surface Current Approach for the Computation of the Series Impedance of Power Cables with Inclusion of Skin and Proximity Effects