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It can be calculated with SCMU if your case includes sequence data.
See calculation with savnw.sav below. The equivalent impedance is shown at the bottom of the report.
PTI INTERACTIVE POWER SYSTEM SIMULATOR--PSS(R)E SUN, OCT 08 2017 21:19
PSS(R)E PROGRAM APPLICATION GUIDE EXAMPLE
BASE CASE INCLUDING SEQUENCE DATA
UNBALANCES APPLIED:
LINE TO LINE TO GROUND FAULT AT BUS 151 [NUCPANT 500.00] EXCLUDED PHASE 1
L-L Z = (0.0,0.0) L-G Z = (0.0,0.0)
SEQUENCE THEVENIN IMPEDANCES AT FAULTED BUSES
BUS# X-- NAME --X BASKV ZERO POSITIVE NEGATIVE
151 NUCPANT 500.00 0.00017 0.00600 0.00409 0.01765 0.00409 0.01765
LINE TO LINE TO GROUND FAULT AT BUS 151 [NUCPANT 500.00]:
SEQUENCE RE(V0) IM(V0) RE(V+) IM(V+) RE(V-) IM(V-) RE(3V0) IM(3V0)
PHASE RE(VA) IM(VA) RE(VB) IM(VB) RE(VC) IM(VC)
151 (P.U.) 0.1930 0.0618 0.1930 0.0618 0.1930 0.0618 0.5790 0.1853
NUCPANT 500.00 0.5790 0.1853 0.0000 0.0000 0.0000 -0.0000
SEQUENCE RE(I0) IM(I0) RE(I+) IM(I+) RE(I-) IM(I-) RE(3I0) IM(3I0)
PHASE RE(IA) IM(IA) RE(IB) IM(IB) RE(IC) IM(IC)
FROM 101 CKT 1 -4.8519 14.0850 9.0619 -8.6127 -0.8115 2.3904 -14.5557 42.2551
NUC-A 21.600 3.3986 7.8627 -18.5060 8.6456 0.5518 25.7468
FROM 102 CKT 1 -4.8519 14.0850 9.0619 -8.6127 -0.8115 2.3904 -14.5557 42.2551
NUC-B 21.600 3.3986 7.8627 -18.5060 8.6456 0.5518 25.7468
FROM 152 CKT 1 -0.2046 0.4339 -1.1123 -5.6030 -0.8804 0.6515 -0.6139 1.3016
MID500 500.00 -2.1973 -4.5177 -4.6248 3.1104 6.2082 2.7088
FROM 152 CKT 2 -0.2046 0.4339 -1.1123 -5.6030 -0.8804 0.6515 -0.6139 1.3016
MID500 500.00 -2.1973 -4.5177 -4.6248 3.1104 6.2082 2.7088
FROM 201 CKT 1 -1.0921 2.8011 1.4018 -14.1772 -1.9712 2.3697 -3.2762 8.4034
HYDRO 500.00 -1.6615 -9.0063 -15.1374 5.7838 13.5227 11.6259
SUM OF CONTRIBUTIONS INTO BUS 151 [NUCPANT 500.00]:
151 -11.2051 31.8389 17.3011 -42.6085 -5.3549 8.4534 -33.6154 95.5168
NUCPANT 500.00 0.7411 -2.3161 -61.3992 29.2958 27.0426 68.5371
CONTRIBUTIONS EQUIVALENT POSITIVE SEQUENCE ADMITTANCE 17.2353 -226.2707 PU
1723.53 -22627.07 MVA
SHUNT + LOAD CURRENT AT BUS 151 [NUCPANT 500.00]:
151 0.0000 0.0000 0.3706 -1.1581 0.3706 -1.1581 0.0000 0.0000
NUCPANT 500.00 0.7411 -2.3161 -0.3706 1.1581 -0.3706 1.1581
FAULT CURRENT AT BUS 151 [NUCPANT 500.00]:
151 -11.2051 31.8389 16.9306 -41.4504 -5.7254 9.6115 -33.6154 95.5168
NUCPANT 500.00 0.0000 0.0000 -61.0286 28.1377 27.4132 67.3791
POSITIVE SEQUENCE EQUIVALENT FAULT ADMITTANCE 17.2353 -220.2707 PU
1723.53 -22027.07 MVA
