How do you perform short-circuit analysis for protective device coordination?

Short-circuit analysis calculates fault currents at various system points using impedance data and Thevenin equivalents. For each fault location, determine positive, negative, and zero sequence impedances to the fault. Apply symmetrical component equations for different fault types: three-phase (If = V/Z1), line-to-ground (If = 3V/(Z1+Z2+Z0)), line-to-line (If = V*sqrt(3)/(Z1+Z2)). Results enable: circuit breaker rating verification, relay setting calculations, and equipment withstand verification. Include motor contribution and fault impedance variations.