SYSTEM COMPONENTS AND PROTECTION DEVICESElectrical Distribution SystemsOverlappingProtectiveZonesA separate zone of protection is provided around each system element (Figure 2). Any failurethat may occur within a given zone will cause the tripping or opening of all circuit breakerswithin that zone. For failures that occur within a region where two protective zones overlap,more breakers will be tripped than are necessary to disconnect the faulty component; however,if there were no overlap of protective zones, a fault in a region between the two zones wouldresult in no protective action at all. Therefore, it is desirable for protective zone overlap toensure the maximum system protection.Figure 2 Protective Relaying ZonesES-15 Page 4 Rev. 0
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