[erdschlussortung-im-strahlennetz-260602-kn, 1, en_US]
Figure 2-81 Location of ground faults in a radial network
In meshed or looped systems, the measuring points of the faulty line also receive the maximum ground fault
current (residual current). Only in this line, "forward" direction is signaled at both ends (Figure 2-82). The rest
of the direction indications in the system may also be useful for ground fault detection. However, some indica-
tions may not be given when the ground current is too low.
[ortung-des-erdschlusses-260602-kn, 1, en_US]
Figure 2-82 Determination of the ground fault location basing on directional indicators in the meshed
system
Setting Notes
General Settings
During configuration of the protection functions (Section 2.1.1 Functional Scope, under address 131 Sens.
Gnd Fault it was determined with which parameters the ground fault detection is functioning.
If address Sens. Gnd Fault = Definite Time is selected, then the settings for the definite-time
elements are available here.
If Sens. Gnd Fault = User Defined PU is selected, a user-specified characteristic can be used for the
overcurrent protection elements 50Ns-1 or 51Ns.
The superimposed high-current element 50Ns-1 is available in all these cases.
If this function is not required, then Disabled is set.
The user characteristics are only available, if the standard measurement procedure cos φ / sin φ has been
set at address 130.
The characteristic for determining the direction is set at address 130 S.Gnd.F.Dir.Ch. It is optional to select
either the standard measurement method cos φ / sin φ or the V0/I0 φ mea. with one sector charac-
teristic.
At address 3101 Sens. Gnd Fault, the function ON or OFF can be set to either ON with GF log or
Alarm Only. If settings ON and ON with GF log are applied, tripping is also possible, otherwise a fault log
2.12.5
Functions
2.12 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
SIPROTEC 4, 7SJ80, Manual 185
E50417-G1140-C343-A8, Edition 12.2017
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