SUB-CYCLE OVERCURRENT PROTECTION FOR SELF-CLEARING FAULTS DUE TO INSULATION BREAKDOWN

The first section of this paper discusses the self-clearing fault phenomena. The second section describes a universal protective relay architecture in which the sub-cycle overcurrent protection scheme has been implemented. The third section describes the protection scheme algorithm and implementation in the relay scheme . T fourth section covers testing of this scheme. An overall universal distribution protection scheme is discussed in section five. Conclusions are given at the end.