[7sj6-richtkennl-bei-sin-mess-20110113, 1, en_US]
Figure 2-97
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 2-83 "Directional characteristic for cos-ϕ-measurement" in the functional description of the
sensitive 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 2-97). 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.
Direction Determination for V0/I0 ϕ Measurement
With the minimum voltage 50Ns-2 Vmin, address 3150 and the level of the pickup current 50Ns-2
PICKUP, address 3113, the lower limit of the circuit segment of element 50Ns-2 is set. The thresholds of the
tripping range in respect of the displacement voltage is set by means of the matching phase angle 50Ns-2
Functions
2.13 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
SIPROTEC 4, 7SJ62/64, Manual 219
C53000-G1140-C207-8, Edition 08.2016
To Next Page
Loading...
Need help?
General
