- 388 -
determined with Equations (2.32-18) to (2.32-23):
where,
Va: Fault voltage (Va=Va0)
Iα: Fault current (=(2Ia−Ib−Ic)/3)
Iα’: Current change before and after the fault (=(2Ia−Ib−Ic)/3−(2ILa−ILb−ILc)/3)
Iα”: Complex conjugate of Iα’
Ia, Ib, Ic: Fault currents in phase-a, phase-b, and phase-c
ILa, ILb, ILc: Load-current in phase-a, phase-b, and phase-c before the fault
I0s: Current in zero-sequence at local terminal
I0m: Adjacent-line current in zero-sequence in parallel lines
R1: Resistance component of line impedance1 in positive-sequence
Χ1: Reactance component of line impedance1 in positive-sequence
R0: Resistance component of line impedance2 in zero-sequence
Χ0: Reactance component of line impedance2 in zero-sequence
R0m: Mutual resistance3 between parallel lines in zero-sequence
X0m: Mutual reactance3 between parallel lines in zero-sequence
Ka: Compensation factor4 for imbalance impedance
Im( ): Expression of imaginary part when a value is placed in parentheses
Re( ): Expression of real part when a value is placed in parentheses
L: Line length5 in the kilometer or mile
• : Symbol of Vector product
1
Note: For example, user should set the R
1
and the X
1
with settings [FL_1R1] and
setting [FL_1X1] respectively, when the impedance of line GJ is considered in
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