Problem 7.1

In the circuit of Figure 7.1, V ¼ 277 volts, L ¼ 2 mH, R ¼ 0:4 W, and o ¼ 2p60
rad/s. Determine (a) the rms symmetrical fault current; (b) the rms asymmetrical
fault current at the instant the switch closes, assuming maximum dc o¤set; (c) the rms
asymmetrical fault current 5 cycles after the switch closes, assuming maximum dc o¤-
set; (d) the dc o¤set as a function of time if the switch closes when the instantaneous
source voltage is 300 volts.