Studies of protection coordination are required to select or verify the clearing characteristics of devices such as fuses, circuit breakers and relays used in the protection scheme. These studies are also needed to determine the protective device settings that will provide selective fault isolation. In a properly coordinated system, a fault results in interruption of only the minimum amount of equipment necessary to isolated the faulted portion of the system.
Short circuit and load flow calculations are a prerequisite for a coordination study, because they establish minimum and maximum current levels at which coordination must be achieved.



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