1. (20 points) A short circuit occurs in the series R-L circuit with V 20 kV, X-8 ohm, and R = 0.8 ohm. The circuit breaker opens 3 cycles after fault inception. Determine (a) the rms ac fault current (lac), (b) the rms "momentary" current (IRMS), at T = opens, and (c) the rms 0.5 cycle, which passes through the breaker before asymmetrical fault current that the breaker interrupts. === X X (Hint: t= where T is time in cycles; T R WR 2fR