Protective Device Coordination Studies

Protective Device Coordination studies are performed to ensure that transformers, capacitor banks, electric motors and cables are protected against damage from short circuit currents. These studies are used to select appropriately rated protective devices and their settings. The objective is to minimize the impact of short circuits in the electrical system by isolating faults as quickly as possible, while maintaining power to the rest of the system. The rating and settings of protective devices recommended from the coordination study would represent an exercise of judgment as to the best balance of the two goals-protection and selectivity.