Repeat Example 7.1 with \(\mathrm{V}=4 \mathrm{kV}, \mathrm{X}=2 \Omega\), and \(\mathrm{R}=1 \Omega\)

Example 7.1

A bolted short circuit occurs in the series R–L circuit of Figure 7.1 with V = 20 kV, X = 8 V, R = 0.8 V, and with maximum dc offset. The circuit breaker opens 3 cycles after fault inception. Determine

(a) the rms ac fault current,

(b) the rms “momentary” current at τ = 0.5 cycle, which passes through the breaker before it opens, and

(c) the rms asymmetrical fault current that the breaker interrupts.