AG
CG
Load
Load
Y
Y
ANSI06000550_2_en.vsd
ANSI06000550 V2 EN-US
Figure 249: A typical cross-country fault situation
3V
0
V
A
V
B
V
C
V
B
F
V
C
F
V
C
F
en06000551_ansi.vsd
ANSI06000551 V1 EN-US
Figure 250: Voltage distribution before and during a single phase-to-ground fault
During a cross-country fault, the fault current path for the fault that is not on the
protected feeder will not go through the relay. (For a more meshed network though,
there will be some current.) See Figure
251. Only in the one phase with the fault on the
protected feeder, a significant fault current may be measured by the relay
. The result is
1MRK 504 163-UUS A Section 8
Impedance protection
Transformer protection RET670 2.2 ANSI 497
Application manual
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