Function Description - Siemens SIPROTEC 5 Manual

Fault Recorder
7.4 Trigger Functions 1-Phase
Each function block of the group of triggers contains the level triggers Max. trigger and Min. trigger
as well as the gradient triggers dM/dt rise (/Filter time) and dM/dt drop active of the corre-
sponding measurand.
7.4.4.3

Function Description

Logic
The following logic diagram shows the operating state of the power trigger.
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Figure 7-60
The Power trigger function 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 a 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 on the recorder.
Function Blocks
Function blocks of the Power trigger function:
•
Trigger P: Setting of the triggers for the active power
•
Trigger Q: Setting of the triggers for the reactive power
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.
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Logic Diagram of the Power Trigger
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017