In the Circuit of Figure $7.1, V=220$ Volts $L=3 \mathrm{mH}, \mathrm{R}=0.5 \Omega$

Essay

In the circuit of Figure $7.1, V=220$ volts, $L=3 \mathrm{mH}, \mathrm{R}=0.5 \Omega$ , and $\omega=2 \pi 60$ $\mathrm{rad} / \mathrm{s}$ . Determine (a) the rms symmetrical fault current; (b) the rms asymmetrical fault current at the instant the switch closes, assuming maximum dc offset; (c) the rms asymmetrical fault current 5 cycles after the switch closes, assuming maximum dc offset; (d) the dc offset as a function of time if the switch closes when the instantaneous source voltage is 244 volts.