“…In the literature, the multiresolution analysis‐based techniques such as discrete wavelet transform (DWT) [9] and wavelet singular entropy [10] are also used for fault detection and out‐of‐step protection. In this context, training‐based approaches such as adaptive fuzzy neural inference system (ANFIS) [11], data mining‐based technique [12], differential power‐based approach [13], Taylor series‐based technique [14], and phase space‐based technique [15] are also used and reported. Recently, in [16], the authors have used Teager Kaiser energy operators (TKEO) of zero sequence voltage and negative sequence current to discriminate fault situation from swing situation.…”