This paper compares three possibilities for determining the flicker level generated by industrial customer with arc furnaces: by calculating the electromagnetic perturbations, by experimental measurements, and by simulation using specialized software. The influence of the fault level on the propagation of perturbation in the power system represents a challenging issue studied within the existing context. Several mitigation measures of voltage fluctuations have been considered in this paper. A solution is using a STATCOM, which avoids the exceeding of admissible perturbation levels stipulated by the standards.