Setting Notes - Siemens 7SC80 Manual

[erdschlussortung-im-strahlennetz-260602-kn, 1, en_US]
Figure 2-92
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
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 2-93

Setting Notes

2.13.4
General Settings
During configuration of the protection functions (Section
Fault the parameters used by the ground fault detection were specified.
When selecting Sens. Gnd Fault = Definite Time, the definite time parameters are available here.
When selecting Sens. Gnd Fault = User Defined PU, a user-defined characteristic can be used for the
overcurrent elements 50Ns-1 or 51Ns.
When selecting Sens. Gnd Fault = TOC IEC or Sens. Gnd Fault = TOC ANSI, you can use an inverse
time characteristic for the 51Ns element according to IEC or ANSI standard.
The superimposed high-current element 50Ns-2 is available in all these cases.
If this function is not required, it is set to Disabled.
The characteristics according to IEC or ANSI standards and the user characteristics are only available if the
standard measurement method cos φ / sin φ is 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
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
Location of ground faults in a radial network
Determination of the ground fault location basing on directional indicators in the meshed
system
2.13 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
2.1.1 Functional Scope) at address 131 Sens. Gnd
Functions
(Figure 2-93). The rest
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