(a) Repeat Problem 9.14 for the case of Problem 9.4 (b).

(b) Repeat Problem 9.19 (a) for a single line-to-ground arcing fault with arc impedance \(Z_{\mathrm{F}}=(15+j 0) \Omega\).

(c) Repeat Problem 9.19 (a) for a bolted line-to-line fault.

(d) Repeat Problem 9.19 (a) for a bolted double line-to-ground fault.

(e) Repeat Problems 9.4 (a) and 9.19 (a) including \(\Delta-Y\) transformer phase shifts. Assume American standard phase shift. Also calculate the sequence components and phase components of the contribution to the fault current from generator \(n(n=1,2\), or 3\()\) as specified by the instructor in Problem 9.4 (b).

Problem 9.14

Determine the subtransient fault current in per-unit and in kA, as well as the per-unit line-to-ground voltages at the fault bus for a bolted single line-to-ground fault at the fault bus selected in Problem 9.2.

 Problem 9.4

In Problem 9.1 and Figure 9.17, let \(765 \mathrm{kV}\) be replaced by \(500 \mathrm{kV}\), keeping the rest of the data to be the same. 

Figure 9.17

"X T. X 15 1 Line-3 Line 1-2. G 38 Line 2-3 (2)