Repeat Problem 9.43 for a bolted line-to-line fault at bus 1.

Problem 9.43

(b) Using the bus impedance matrices determined in Problem 9.42, verify the fault currents for the faults given in Problems 9.3, 9.14, 9.15, 9.16, and 9.17.

Problems 9.3

Determine the subtransient fault current in per-unit and in kA during a bolted threephase fault at the fault bus selected in Problem 9.2.

Problem 9.2

Faults at bus n in Problem 9.1 are of interest (the instructor selects n = 1, 2, or 3). Determine the The´venin equivalent of each sequence network as viewed from the fault bus. Prefault voltage is 1.0 per unit. Prefault load currents and D–Y transformer phase shifts are neglected.

Problem 9.1

The single-line diagram of a three-phase power system is shown in Figure 9.17. Equipment ratings are given as follows:

 Figure 9.17

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 9.2

Faults at bus n in Problem 9.1 are of interest (the instructor selects n = 1, 2, or 3). Determine the The´venin equivalent of each sequence network as viewed from the fault bus. Prefault voltage is 1.0 per unit. Prefault load currents and D–Y transformer phase shifts are neglected.

Problem 9.1

The single-line diagram of a three-phase power system is shown in Figure 9.17. Equipment ratings are given as follows:

 Figure 9.17

Problem 9.15

Repeat Problem 9.14 for a single line-to-ground arcing fault with arc impedance Z_F = 30 + j0 Ω.

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 9.2

Faults at bus n in Problem 9.1 are of interest (the instructor selects n = 1, 2, or 3). Determine the The´venin equivalent of each sequence network as viewed from the fault bus. Prefault voltage is 1.0 per unit. Prefault load currents and D–Y transformer phase shifts are neglected.

Problem 9.1

The single-line diagram of a three-phase power system is shown in Figure 9.17. Equipment ratings are given as follows:

 Figure 9.17

Problem 9.16:

Repeat Problem 9.14 for a bolted line-to-line fault

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 9.2

Faults at bus n in Problem 9.1 are of interest (the instructor selects n = 1, 2, or 3). Determine the The´venin equivalent of each sequence network as viewed from the fault bus. Prefault voltage is 1.0 per unit. Prefault load currents and D–Y transformer phase shifts are neglected.

Problem 9.1

The single-line diagram of a three-phase power system is shown in Figure 9.17. Equipment ratings are given as follows:

 Figure 9.17

Problem 9.17

Repeat Problem 9.14 for a bolted double line-to-ground fault.

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 9.2

Faults at bus n in Problem 9.1 are of interest (the instructor selects n = 1, 2, or 3). Determine the The´venin equivalent of each sequence network as viewed from the fault bus. Prefault voltage is 1.0 per unit. Prefault load currents and D–Y transformer phase shifts are neglected.

Problem 9.1

The single-line diagram of a three-phase power system is shown in Figure 9.17. Equipment ratings are given as follows:

 Figure 9.17