Use of line surge arresters for the improvement of the lightning performance of 63 kV and 90 kV shielded and unshielded transmission lines

The lightning performance of 63 kV and 90 kV shielded and unshielded lines, protected by line surge arresters are considered. A specialized software package is used for the computation of the line fast front transients. A Monte Carlo statistical method, together with a three-dimensional electrogeometric model is used to determine the lightning stroke locations. Different arrester installation configurations are analyzed and compared. The energy duties of the line surge arresters are computed statistically.