Toshiba GR200 Series Instruction Manual page 411

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:
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
Note: For example, user should set the R 1 and the X 1 with settings [FL_1R1] and
1
setting [FL_1X1] respectively, when the impedance of line GJ is considered in
2�� − ��
��
�� =
α
2�� − �� – ��
�� �� ��
�� ' = −
α
3
・��
�� = ��
��
�� = �� ∙ �� ∙ �� " + �� ∙ ��
1 α α 0 0s
�� = X ∙ �� ∙ �� " + X ∙ ��
1 α α 0 0s
Im ( �� ) × L
χ =
{ Im ( �� ) + Re(��) } × ��
Load-current in phase-a, phase-b, and phase-c before the fault
- 388 -
– ��
�� ��
3
2�� − �� – ��
���� ���� ����
3
"
α
∙ �� "+�� ∙ �� ∙ �� "
α 0�� 0m α
∙ �� "+X ∙ �� ∙ �� "
α 0�� 0m α
��
6F2S1914 (0.49)
(2.32-18)
(2.32-19)
(2.32-20)
(2.32-21)
(2.32-22)
(2.32-23)
GRL200 (Soft 033 & 037)