Module 3 : Sequence Components and Fault Analysis
Lecture 10 : Sequence Components
10.5
Fault Current Calculation in Sequence Domain (contd..)
10.5.3
Line to Line Ground Fault (LLG):
1.
Bolted Fault:
2.
Fault current through impedance Z
f
Fault current in phases b and c:
I
b
= I
0
+ a
2
Ia
1
+ aIa
2
I
c
= I
0
+ aIa
1
+ a
2
Ia
2
I
F
= I
b
+ I
c
= 3I
0
Z
f
is fault impedance between the lines, while Z
FG
is the fault impedance to Ground.
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