GE MiCOM P40

Network
Dist
S
Z
IED
S
V
L
Z
F
Z
I
V
Bus
V02717
Figure 41: Simplified Reverse Fault
For a fault condition we can write the following equations:
V
S
= V - I(Z
S
+ Z
L
)
90
1
90° ≤ ∠ −
+
⋅ +






−∠ −
( )
≤ − °V I Z Z V I Z
p
p
S L
( )
The Mho contraction for a reverse fault is illustrated in the following diagram:
Chapter 7 - Distance Protection P446SV
118 P446SV-TM-EN-1