Question

A 50 MVA, 11 kV, three-phase alternator was subjected to different types of faults. The fault currents were: 1870 Amps for three-phase fault, 2590 Amps for L-L fault, and 4130 Amps for L-G fault. The alternator neutral is solidly grounded. Find the three sequence reactances of the alternator.

Name: a 50 mva 11 kv three phase alternator was subjected to different types of faults the fault currents were 1870 amp for three phase fault ii 2590 amp for l lfaule iii 4130 amp for l g fault th 89734
Uploaded: 2023-06-13T13:44:43-08:00
Duration: 4 min 12 s
Channel: Supreeta N
Description: a 50 mva 11 kv three phase alternator was subjected to different types of faults the fault currents were 1870 amp for three phase fault ii 2590 amp for l lfaule iii 4130 amp for l g fault th 89734

          A 50 MVA, 11 kV, three-phase alternator was subjected to different types of faults. The fault currents were: 1870 Amps for three-phase fault, 2590 Amps for L-L fault, and 4130 Amps for L-G fault. The alternator neutral is solidly grounded. Find the three sequence reactances of the alternator.

Added by Ismael P.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Supreeta N

06/13/2023

Step 1

Base current (I_base) = MVA_base / (sqrt(3) * V_base) I_base = 50 MVA / (sqrt(3) * 11 kV) = 2620.74 A Base impedance (Z_base) = V_base / I_base Z_base = 11 kV / 2620.74 A = 4.19 ohms Show more…

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A 50 MVA, 11 kV, three-phase alternator was subjected to different types of faults. The fault currents were: 1870 Amps for three-phase fault, 2590 Amps for L-L fault, and 4130 Amps for L-G fault. The alternator neutral is solidly grounded. Find the three sequence reactances of the alternator.