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I f
Bus G
FL
t
Source
G'
Figure 2.26-1 Relationship between fault location and local IED in parallel line
I
χ =
{ Im ( R
∙ I
1
α
where,
V α :
I α :
I α ':
Iα":
I a ,I b ,I c :
I La ,I Lb ,I Lc :
I 0s :
R 1 :
X 1 :
R 0 :
X 0 :
K a :
Line GH
t
Distance GF
TT
t
2I
− I
a
b
I
=
α
3
2I
− I
– I
2I
a
b
c
' =
−
α
3
・I
Im(V
a
" ) + Re(X
∙ I
" + R
∙ I
∙ I
α
0
0s
α
Fault voltage (=V a0 )
Fault current
Current change before and after fault occurrence
Complex conjugate of Iα'
Fault currents in phase-'a', phase-'b', and phase-'c'
Load currents in phase-'a', phase-'b', and phase-'c'
Zero-sequence current on the local line i.e. 'Line 1'
Resistance component of positive-sequence self-impedance (Z 1 ), [FL_R1]
Reactance component of positive-sequence self-impedance (Z 1 ), [FL_X1]
Resistance component of zero-sequence self-impedance (Z 0 ), [FL_R0]
Reactance component of zero-sequence self-impedance (Z 0 ), [FL_X0]
Compensation factor for phase-'a' in an unbalanced 3-phase line,
- 295 -
Bus H
Line 1
Fault F
TT
TT
t
t
Line 2
TT
t
– I
c
− I
– I
La
Lb
Lc
3
") × L
α
∙ I
∙ I
" + X
∙ I
1
α
α
0
0s
6F2T0207 (0.01)
I L
Load/Source
H'
(2.26-1)
(2.26-2)
") } × K
∙ I
α
a
(2.26-3)
GRE200 (5,6)
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