Application And Setting Notes For Direction Determination; Application And Setting Notes For Stages - Siemens 7SJ82 Manual

Blocking the Tripping by Pickup of the Main Protection Functions
The pickup and type of pickup for the main protection functions can block the tripping of the stage. You can
perform this setting via 2 parameters:
•
Blocking by
This setting is used to select the zone or stage at which blocking is to occur in the event of pickup.
•
Blocking by prot. pickup
The pickup type at which the blocking is to occur is defined with this parameter. The blocking can occur
at any pickup or only at 1-pole or only at multipole pickups.
This parameter is also used to set that no blocking should occur when the main protection has picked up.
Blocking of Tripping via the Device-Internal Inrush-Current Detection Function
If the device is equipped with the additional Inrush-current detection function, the stages can be stabilized
against tripping due to transformer inrush currents.
With the Blk. w. inrush curr. detect. parameter, you can define whether tripping of the stage
should be blocked when a threshold value is exceeded due to an inrush current. In case of a blocking, the
stage picks up. The start of the time delay and tripping are however blocked. The stage signals this by way of a
corresponding indication. If the blocking drops out and the threshold value of the stage is still exceeded, the
tripping delay (time delay) is started. After that time, the stage operates.
6.18.4

Application and Setting Notes for Direction Determination

Parameter: Limit Angle Region Forward
•
Recommended setting value (_:2311:101) Angle forward α = 338°
•
Recommended setting value (_:2311:102) Angle forward β = 122°
With the parameters Angle forward α and Angle forward β, you can change the location of the direc-
tional characteristic curve.
Siemens recommends using the defaults, because the function with these settings reliably determines the
direction.
Parameter: Minimum Negative-Sequence System Variables V2 and I2
•
Default setting (_:2311:107) Min. neg.-seq. voltage V2 = 0.7 V
•
Default setting (_:2311:106) Min. neg.-seq. current I2 = 0.05 A
With the parameters Min. neg.-seq. voltage V2 and Min. neg.-seq. current I2, you can
specify the minimum negative-sequence system values for direction determination with V2 and I2. The set
limiting values must not be exceeded by operational unbalances.
6.18.5

Application and Setting Notes for Stages

Parameter: Directional mode
•
Default setting (_:8101:114) Directional mode = forward
You use the Directional mode parameter to define the directional mode of the stage.
Parameter Value
non-directional
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Description
If the stage is to work in the forward and reverse direction (in the direction of
the line and busbar), then select this setting.
The stage will work with this setting even if no direction measurement is
possible, for example due to insufficient polarization voltage (or none at all), or
due to failure of the measuring voltage.
Protection and Automation Functions
6.18 Directional Negative-Sequence Protection
647