Simulation of transients in underground cables with frequency-dependent modal transformation matrices

A mathematical model for the simulation of electromagnetic transients in underground high-voltage cables is presented. The solution is carried out in the time domain; therefore, this model is compatible with time-domain solution algorithms, such as the one used in the EMTP (Electromagnetic Transients Program). The frequency dependence of the cable parameters and of the modal transformation matrices is taken into account. Comparisons with analytical and measured results are included