The Level trigger monitors the measurand for minimum and maximum limit violations. The Gradient trigger
monitors the positive slope (increasing) and the negative slope (decreasing) of the measurand for limit viola-
tion. The gradient is formed based on the set filtering time.
A hysteresis of 2 % of the setting value is preset for the level and gradient triggers. This is equal to 0.980 p.u.
for the max. and gradient trigger and to 1.020 p.u. for the Min trigger.
Exceeding or dropping below one of the set threshold value leads to trigger tripping. The trigger tripping is
however effective on the recorders only if you have routed the trigger to the recorder.
NOTE
The thresholds can be set in the primary, secondary, and percentage view. All subsequent setting values
are shown in the secondary view.
Function Blocks
Function blocks of the Current trigger function:
•
I Ground. Trig: Setting of the trigger for the fundamental-component value of the measured current
•
Trig. I RMS: Setting of the trigger for the RMS value of the measured current
•
Trigger I0: Setting of the trigger for the zero-sequence component of the measured current
•
Trigger I1: Setting of the trigger for the positive-sequence component of the measured current
•
Trigger I2: Setting of the trigger for the negative-sequence component of the measured current
NOTE
The triggers I Ground. Trig and Trig. I RMS are 3-phase building blocks (I
1
, I
2
, I
3
). The set threshold values
have the same effect on all phases.
NOTE
The thresholds can be set in the primary, secondary, and percentage view. All subsequent setting values
are shown in the secondary view.
Mode
The trigger is switched on, off, or in test mode. In test mode, the fault records are marked with a test flag.
You can find more information on the mode in chapter 7.1.3 Step 2: Setting the Parameters and Routing in
DIGSI 5 .
Max. trigger active/Min. trigger active
With the parameters Max. trigger active and Min. trigger active, you define whether the
respective level trigger is active or inactive.
Max. trigger/Min. trigger
With the parameters Max. trigger and Min. trigger, you define from which threshold value the acti-
vated level trigger starts a fault record.
dM/dt rise active - dM/dt drop active
With the parameters dM/dt rise active and dM/dt drop active, you define whether the respective
gradient trigger is active or inactive.
Filter time
With the Filter time parameter, you define the number of the periods with which the gradient is deter-
mined.
Fault Recorder
7.5 Trigger Functions 3-Phase
314 SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
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