A 3-phase system has a single phase to earth fault (i.e. phase A is short circuit to earth while phase B and C are healthy). The equivalent impedances are Z+=j0.4pu, Z.-j0.3pu, Zo-j0.1pu. Calculate the per-unit phase A current /A. с B A O-14.05pu O-13.95pu O-13.85pu O-j3.75pu O-13.65pu

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A 3-phase system has a single phase to earth fault (i.e. phase A is short circuit to earth while phase B and C are healthy). The equivalent impedances are Z4=j0.4pu. Z_=j0.3pu, Zo=j0.1pu. Calculate the per-unit phase Acurrent/A.
홍
-j4.05pu
-j3.95pu
-j3.85pu
-j3.75pu
○ -j3.65pu
C
B
A
Transcribed Image Text:A 3-phase system has a single phase to earth fault (i.e. phase A is short circuit to earth while phase B and C are healthy). The equivalent impedances are Z4=j0.4pu. Z_=j0.3pu, Zo=j0.1pu. Calculate the per-unit phase Acurrent/A. 홍 -j4.05pu -j3.95pu -j3.85pu -j3.75pu ○ -j3.65pu C B A
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