NOTE
The Hold mode 1p dead time setting is only available in devices with 1-/3-pole tripping. In devices
with 3-pole tripping, this setting does not apply.
Parameter: Stabiliz. w. phase current
•
Recommended setting value (_:8101:111) Stabiliz. w. phase current = 10 %
In order to avoid unwanted pickups and tripping, the negative-sequence system current stage is stabilized
with the phase currents.
More information can be found in chapter 6.18.3 Function Description.
The threshold value increases as the phase currents increase.
You can change the stabilization factor (= gradient) via the Stabiliz. w. phase current parameter.
Siemens recommends a default setting of 10 % under normal operations.
Parameter: Threshold
•
Default setting (_:8101:3) Threshold = 1.5 A
Define the pickup value corresponding to the application. In doing so, for the time-graded stages, the setting
for the superordinate and subordinate stages must be taken into account in the grading chart.
With a very sensitive setting, you must make sure that the negative-sequence system current does not lead to
undesired response of the stage due to unbalance (for example non-twisted line).
Parameter: Operate delay
•
Default setting (_:8101:6) Operate delay = 0.30 s
The tripping delay (time delay) to be set is derived from the time-grading schedule that has been prepared for
the system.
When selecting the current and time setting, pay attention to whether the stage must work dependent on the
direction.
Settings
Addr.
Parameter C Setting Options Default Setting
General
_:2311:101 General:Angle forward α 0 ° to 360 ° 338 °
_:2311:102 General:Angle forward β 0 ° to 360 ° 122 °
_:2311:107 General:Min. neg.-seq.
voltage V2
0.150 V to 34.000 V 1.213 V
_:2311:106 General:Min. neg.-seq.
current I2
1 A @ 100 Irated 0.030 A to 10.000 A 0.050 A
5 A @ 100 Irated 0.15 A to 50.00 A 0.25 A
1 A @ 50 Irated 0.030 A to 10.000 A 0.050 A
5 A @ 50 Irated 0.15 A to 50.00 A 0.25 A
1 A @ 1.6 Irated 0.001 A to 1.600 A 0.050 A
5 A @ 1.6 Irated 0.005 A to 8.000 A 0.250 A
Definite-T 1
_:8101:1 Definite-T 1:Mode
•
off
•
on
•
test
off
_:8101:2 Definite-T 1:Operate &
flt.rec. blocked
•
no
•
yes
no
6.18.6
Protection and Automation Functions
6.18 Directional Negative-Sequence Protection
SIPROTEC 5, Overcurrent Protection, Manual 649
C53000-G5040-C017-8, Edition 07.2017
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