Siemens SIPROTEC 5 Manual page 298

Fault Recorder
7.5 Trigger Functions 3-Phase
[dwlotriu-161012-01.tif, 1, en_US]
Figure 7-62
The function Voltage Trigger is subdivided into Level and Gradient trigger.
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 1.020 p.u. for the Min trigger.
Exceeding or dropping below one of the set threshold values leads to trigger tripping. The trigger tripping is
however first effective on the recorders, if you have routed the trigger to the recorder.
Function Blocks
Function blocks of the Voltage Trigger function:
•
V Fund. Trig: Setting of the trigger for the fundamental-component value of the measured voltage
•
Trig. V RMS: Setting the trigger for the RMS value of the measured voltage
•
Trigger V0: Setting of the trigger for the zero-sequence components of the measured voltage
•
Trigger V1: Setting of the trigger for the positive-sequence components of the measured voltage
•
Trigger V2: Setting of the trigger for the negative-sequence components of the measured voltage
NOTE
i
i
The triggers V Fund. and V RMS are 3-phase building blocks (V
values have the same effect on all phases.
NOTE
i
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The thresholds can be set in the primary, secondary, and percentage view. All subsequent setting values
are shown in the secondary view.
298
Logic Diagram of a Voltage Trigger
, V , V , V , V , V ). The set threshold
A B C AB BC CA
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017