Parameter Value Description
forward
Select these settings if the stage is only to work in a forward direction (in direc-
tion of the line).
reverse
Select this setting if the level is only to work in the reverse direction (in the
direction of the busbar).
Parameter: Blk. w. inrush curr. detect.
If the device is equipped with the additional Inrush-current detection function, the stages can be stabilized
against tripping due to transformer inrush currents.
•
Default setting (_:8101:116) Blk. w. inrush curr. detect. = no
Parameter Value Description
no
The transformer inrush current detection does not affect the stage.
Select this setting in the following cases:
1) In cases where the device is not used on transformers.
2) In cases where the device is used on transformers and the threshold value of
the stage is set above the maximum inrush current of the transformer.
yes
When the transformer inrush current detection detects an inrush current that
can lead to a tripping of the stage, the start of the time delay and tripping of
the stage are blocked.
Select this setting if the device is used on transformers and the threshold value
of the stage is set below the maximum inrush current of the transformer.
Parameter: Blocking by the main Protection
•
Recommended setting value (_:8101:140) Blocking by =
If you wish to give selective fault clarification through the main protection function precedence over tripping
through the directional negative-sequence protection, you can define this via the 2 parameters Blocking by
and Blocking by prot. pickup. The Blocking by parameter is used to select the zones or tripping
stages of the main protection function(s), upon whose pickup the negative-sequence protection is to be
blocked.
Parameter: Blocking by prot. pickup
•
Default setting (_:8101:130) Blocking by prot. pickup = every pickup
The Blocking by prot. pickup parameter can be used to define the type of pickup, which leads to the
blocking.
Parameter Value
Description
every pickup
Blocking at every pickup
1-phase pickup
Blocking only at 1-pole pickup
multi-phase pickup
Blocking only at multipole pickup
no pickup
If the pickup of the main protection function should not lead to blocking of the
negative-sequence protection, select this setting.
Parameter: Hold mode 1-p dead time
•
Default setting (_:8101:112) Hold mode 1p dead time = 0.040 s
The Hold mode 1p dead time setting is used to define the time by which the device-internal signal for the
1-pole interruption is extended after the end of the 1-pole interruption.
At all line ends, there is no simultaneous switch-in after a 1-pole dead time. Thus, the parameterized operating
mode for a 1-pole dead time must be retained for a certain time after the switch-in (end of the 1-pole dead
time) until the other end or ends have securely switched in. The time to be set here corresponds to the
maximum time between the switch-in of the 1st circuit breaker and the switch-in of the last circuit breaker at
all ends of the feeder after a 1-pole dead time.
Protection and Automation Functions
6.18 Directional Negative-Sequence Protection
648 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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