Recently, Zeineldin  et al.  proposed Dual Setting Over Current Relays (DSOCRs) application in looped distribution networks  [1] . Application of DSOCRs separates primary and back up roles of relays and relieves protection coordination constraint. Authors reported a significant reduction in relays operating times.
['Tohid Soleymani Aghdam', 'Hossein Kazemi Karegar', 'Ali Abbasi']
Discussion on “Optimal Protection Coordination for Meshed Distribution Systems With DG Using Dual Setting Relays”