However, phenomena generated by fault and switching operation, like the magnitude and phase step changes, which are not representative of the state of the network, can affect the synchrophasor estimation. The synchrophasors affected by this kind of phenomena should not be considered and should be flagged to avoid their use in applications. On the other hand, in [1], it has been reported that power swings must be considered as a sequence of static conditions, and as a consequence, PMUs should be able to accurately measure them. It should be highlighted that the range considered for the power swing frequencies is superimposed to a portion of the range of frequencies of interharmonics caused by different phenomena, which, according to the previous considerations, should be filtered out.