the fault. When cross-country faults occur, the practice is to trip only one of the faulty
lines. In other cases, a sensitive, directional ground-fault protection is provided to trip, but
due to the low fault currents long tripping times are utilized.
Figure
71 shows an occurring cross-country fault. Figure 72 shows the achievement of
line voltage on healthy phases and an occurring cross-country fault.
AG
CG
Load
Load
Y
Y
ANSI06000550_2_en.vsd
ANSI06000550 V2 EN
Figure 71: An occurring cross-country fault on different feeders in a sub-
transmission network, high impedance (resistance, reactance) grounded
1MRK 506 334-UUS A Section 6
Impedance protection
153
Application manual
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