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 shift the characteristic curve.
Set the time value in seconds. The characteristic curve is shifted via the Time dial parameter.
NOTE
The value pairs must be entered in continuous order.
Parameter: Time dial
•
Default setting (_:101) Time dial = 1
With the Time dial parameter, you displace the characteristic curve in the time direction.
The set value for the Time dial parameter is derived from the time-grading schedule that has been prepared
for the electrical power system. Where no time grading and therefore no displacement of the characteristic
curve is required, leave the Time dial parameter at 1.
Parameter: Reset
•
Default setting (_:110) Reset = disk emulation
With the Reset parameter, you define whether the stage drops out according to the dropout characteristic
curve (in accordance with the behavior of a disk emulation = rotor disk) or instantaneously.
Parameter Value
Description
disk emulation
In the case of this setting, a dropout characteristic curve has to be set in
addition to the operate curve.
Select this setting if the device is coordinated with electromechanical
devices or other devices which perform a dropout after a disk emulation.
instantaneous
Select this setting if the dropout is not to be performed after disk emulation
but an instantaneous dropout is desired.
Parameter: Current/time value pairs (of the dropout characteristic curve)
With these settings, you 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 shift the characteristic curve.
Set the time value in seconds. The characteristic curve is shifted via the Time dial parameter.
NOTE
The value pairs must be entered in continuous order.
Parameter: Threshold (absolute)
•
Default setting (_:113) Threshold (absolute) = 0.000 A
With the Threshold (absolute) parameter, you define and change the absolute pickup threshold of the
stage without changing all points of the characteristic curve.
The parameter is only used for special applications. With the default setting, this functionality is disabled. You
can find more information in Pickup and Dropout Behaviors with the User-Defined Characteristic Curve ,
Page 397.
Protection and Automation Functions
6.5 Overcurrent Protection, Ground
SIPROTEC 5, Overcurrent Protection, Manual 399
C53000-G5040-C017-8, Edition 07.2017
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