Parameter Value Description
no
The positive gradient of the current of the fundamental component is not
monitored.
If the gradient trigger does not operate phase-selectively, the set threshold value of the parameter +dM/dt
(Non-phs sel.) applies to all phases.
If the gradient trigger operates phase-selectively, set the threshold values for the gradient trigger separately
for each phase. Then, the parameters +dM/dt phs A, +dM/dt phs B, and +dM/dt phs C are effective.
The hysteresis is preset at the factory to 0.980 p.u. (equal to 2 %) of the parameter +dM/dt (Non-phs
sel.) and can be adjusted.
Parameter: -dM/dt active/-dM/dt/
•
Default setting (_:9751:104) -dM/dt active = no
•
Default setting (_:9751:108) -dM/dt (Non-phs sel.) = 0.300 A
•
Default setting (_:9751:127) -dM/dt phs A = 0.300 A
•
Default setting (_:9751:128) -dM/dt phs B = 0.300 A
•
Default setting (_:9751:129) -dM/dt phs C = 0.300 A
•
Default setting (_:9751:116) -dM/dt hysteresis = 0.980 p.u.
•
Default setting (_:9751:112) Filter time = 2 periods
With the -dM/dt active parameter, you activate the gradient trigger in order to monitor the negative gradi-
ents of the current of the fundamental component, using the set filtering time (input in periods).
Parameter Value
Description
yes
The negative gradient of the current of the fundamental component is
monitored.
no
The negative gradient of the current of the fundamental component is not
monitored.
If the gradient trigger does not operate phase-selectively, the set threshold value of the parameter -dM/dt
(Non-phs sel.) applies to all phases.
If the gradient trigger operates phase-selectively, set the threshold values for the gradient trigger separately
for each phase. Then, the parameters -dM/dt phs A, -dM/dt phs B, and -dM/dt phs C are effective.
The hysteresis is preset at the factory to 0.980 p.u. (equal to 2 %) of the parameter -dM/dt (Non-phs
sel.) and can be adjusted.
Application and Setting Notes Trigger I RMS
Parameter: Mode
•
Default setting (_:9781:1) Mode = off
With the Mode parameter, you activate the trigger for normal operation (On) or for the test mode (Test).
Parameter Value
Description
on
The function block Trig. I RMS 1 is activated and the RMS value of the
current is monitored according to the set trigger parameter.
off
The function block Trig. I RMS 1 is deactivated.
test
The function block Trig. I RMS 1 is activated for test purposes.
Parameter: Phase-selective
•
Default setting (_:9781:117) Phase-selective = no
7.5.2.5
Fault Recorder
7.5 Trigger Functions 3-Phase
SIPROTEC 5, Fault Recorder, Manual 317
C53000-G5040-C018-5, Edition 11.2017
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