ABSTRACT
Most of the faults that occur on power systems are not the balanced (i.e., symmetrical) threephase faults but the unbalanced (i.e., unsymmetrical) faults, specifically the single line-to-ground (SLG) faults. For example, Reference [5] gives the typical frequency of occurrence for the threephase, SLG, line-to-line, and double line-to-ground (DLG) faults as 5%, 70%, 15%, and 10%, respectively.
