Functions
2.11 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
202
Figure 2-74 Directional characteristic for sin–ϕ–measurement
• In address 3124 PHI CORRECTION the directional line, in this respect, may be rotated within the range ±
45°. Figure 2-62 "Directional characteristic for cos-ϕ-measurement" in the functional description of the sen-
sitive ground fault detection gives an example regarding this topic.
The forward and reverse zone can be reduced at its boundaries at address 3160 α1 red.dir.area and
address 3161 α2 red.dir.area (see Figure 2-74). Siemens recommends using the default setting of 2°
(this corresponds to the behavior of versions without this setting option). In a grounded system in feeders with
very high capacitive current, it can be reasonable to set a slightly larger angle α1 to prevent erroneous pickup
due to transformer and algorithm tolerances.
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