Frequency-domain computation of maximum lightning overvoltage along a cable protected by surge arresters

This paper presents a frequency-domain (FD) approach for calculating the maximum overvoltage along an underground cable (UC) due to lightning. It is considered that the UC is protected by surge arresters at both ends. In the proposed method, the UC is spatially subdivided and direct FD algebraic relations are used to calculate the voltage at each subdivision. Surge arresters are piece-wised represented in the FD and resolved based on the superposition principle. Flashovers are assessed and resolved also in the FD using the superposition principle. The proposed FD approach can be utilized to validate time domain (TD) methods based on the traveling wave concept or on constant-parameter line representation. The proposed method is applied to a 300 kV system with different cable lengths and compared with the results given by the PSCAD software.