Parameter: Current/time value pairs (of the Operate Curve)
Use these settings to define the characteristic curve. Set a current/time value pair for each characteristic-curve
point. The setting follows 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 setting afterwards if you
want to displace the characteristic curve.
Specify 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
You can use the Time dial parameter to displace the characteristic curve in the time direction.
The setting value for the Time dial parameter is derived from the time-grading chart that has been
prepared for the system. Where no grading and therefore no displacement of the characteristic curve is
required, leave the Time dial set to 1.
Parameter: Reset
•
Default setting (_:110) Reset = disk emulation
The Reset parameter is used to define whether the stage drops out according to the dropout characteristic
curve (behavior of a disk emulation = rotor disk) or instantaneously.
Parameter Value
Description
disk emulation
Both operate curve and a dropout characteristic curve have to be specified
with this setting.
Use this setting if the device is coordinated with electromechanical devices or
other devices performing dropout after disk emulation.
instantaneous
Use this setting if the dropout is not to be performed after disk emulation,
that is, if instantaneous dropout is required.
Parameter: Current/time value pairs (of the Dropout Curve)
Use these settings to define the characteristic curve. Set a current/time value pair for each characteristic-curve
point. The setting is determined by the characteristic curve you want to achieve.
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 setting afterwards if you
want to displace the characteristic curve.
Specify 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.
Settings
Addr.
Parameter C Setting Options Default Setting
General
_:1 User curve #:Mode
•
off
•
on
•
test
off
7.7.9.3
Protection and Automation Functions
7.7 Directional Overcurrent Protection, Ground
742 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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