Sensitivity analysis of fault quantities

In this paper, a method for the sensitivity analysis of sequence fault currents and voltages in an unloaded overhead transmission line for perturbation in line parameters is described. The sensitivity of these quantities with respect to conductor radius, spacing between conductors, earth resistivity, height of conductor and frequency are evaluated for an overhead transmission line. The sensitivity predicts the effect of each parameter on fault currents and voltages, which help in tap setting of the relays for protecting the transmission line against faults. To demonstrate the potential of the proposed scheme, the sensitivity of fault currents and voltages for a three phase, 220 kV line has been studied and the results are presented.