An analysis and study of ferroresonance is recommended for any installation where inductive voltage transformers are already mounted, or where new positions, changes or replacements, reconditioning, replacements of said transformers, etc. - which depend on an associated switch exposed to high switching operations of connection and disconnection of its respective position - take place. Overall, when changes in plant topologies take place, changes in plant operating sequences, changes or additions to positions adjacent to the inductive transformer and changes in parameters and characteristics, and changes in series and parallel capacities occur, etc.