Shortfalls of existing methods for characterization of voltage sags from recorded waveform

This paper highlights the shortfalls, existing in the methods, currently used for the characterization of voltage sags, from recorded waveforms. Test waveform, available with IEEE data base, and data generated from Matlab^® simulations, are used to reveal their ambiguities. It is found that none of the existing methods give accurate and complete characteristics of the voltage sag event. Still large gaps exist between real and measured characteristics of the voltage sags. Hence, the need of holistic method, for characterization of voltage sags from recorded waveforms, is asserted.