Stevenson J. Power system analysis
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5 CHAR 12 UNSYMMRICAL FAULTS
- j2.664
,
+
j2.664
GURE 12.19
,
j1.538
)
.
)
}
1.
538
)
-j3.076
Per-unit values of subtransient line currents in all parts of the system of Example 12.6, prefault
current neglected.
phase a IS
-0.565 + jO.350 - jl.026
=
- 0.5
65 - jO.676
These values are shown in Fig. 12.18. The remainder of the calcula
these new values, proceeds as in the example.
Figure 12.19 gives the per-unit values of subtransient line currents in all
parts of the system when the fault occurs at no load. Figure 12.20 shows the
values for the fault occurring on the system when the load specied in the
example is considered. In a larger system where the fault current is much higher
in comparison with the load current the eect of neglecting the load current is
less than is indicated by comparing Figs. 12.19 and 12.20. In the la
however, the prefault currents determined by a power-ow study could simply
be added to the fault current found with the load neglected.
0.665 -j2.685
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