How do you perform a comprehensive protection coordination study?

Protection coordination study involves: collecting system data (one-line diagram, equipment ratings, cable sizes, CT ratios), calculating short circuit currents at all buses using per-unit or impedance methods, plotting device time-current curves, and adjusting settings to ensure proper sequence (0.3-0.4 second margins between devices). Studies use software like ETAP or SKM. Verify coordination for both phase and ground faults. Document settings and provide setting sheets for field implementation. Address arc flash implications of clearing times.