In protective relaying, a "zone of protection" is a defined electrical area within which a protective relay system is designed to detect faults and initiate a tripping action to isolate the faulted equipment. Each piece of equipment, such as a transformer, transmission line, or busbar, is assigned its own zone of protection. The protective relays within a zone are intended to respond only to faults that occur within that zone, ensuring selective tripping and minimizing the impact of faults on the overall power system. For example, a transformer zone of protection would include the transformer itself and the associated circuit breakers on either side. Current t....
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