[dwocpken-140611-02.tif, 2, en_US]
Figure 6-54 Pickup and Dropout Behaviors when Using a Directional User-Defined Characteristic Curve
NOTE
Note that the currents that are lower than the current value of the smallest characteristic-curve point do
not extend the operate time. The pickup characteristic runs in parallel to the current axis up to the smallest
characteristic-curve point. Currents that are larger than the current value of the largest characteristic-curve
point do not reduce the operate time. The pickup characteristic runs in parallel to the current axis from the
largest characteristic-curve point.
Application and Setting Notes
This stage is structured in the same way as the stage with a directional inverse-time characteristic curve. The
only difference is that you can define the characteristic curve as desired. This chapter only provides application
and setting notes for setting characteristic curves.
Parameter: Current/time value pairs (from the operate curve)
Use these settings to define the characteristic curve. Set a current/time value pair for each characteristic-curve
point. The setting depends on the characteristic curve you want to realize.
Set the current value as a multiple of the threshold value. Siemens recommends that you set the Threshold
parameter to 1.00 in order to obtain a simple relation. You can change the threshold value setting afterwards
if you want to displace the characteristic curve.
Set the time value in seconds. The characteristic curve is displaced using the Time dial parameter.
NOTE
The value pairs must be entered in continuous order.
Parameter: Time dial
•
Default setting (_:101) Time dial = 1
Use the Time dial parameter to displace the characteristic curve in the time direction.
6.6.6.2
Protection and Automation Functions
6.6 Directional Overcurrent Protection, Phases
SIPROTEC 5, Overcurrent Protection, Manual 429
C53000-G5040-C017-8, Edition 07.2017
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