Parameter Value
Description
yes
The current of the fundamental component is monitored for overcurrent.
no
The current of the fundamental component is not monitored for overcur-
rent.
If the
Max. trigger
does not operate phase-selectively, the set threshold value of the parameter
Max.
(Non-phs sel.)
applies to all phases.
If the
Max. trigger
operates phase-selectively, set the threshold values for the
Max. trigger
separately
for each phase. Then, the parameters
Max. phs A
,
Max. phs B
, and
Max. phs C
are effective.
The hysteresis is preset at the factory to 0.980 p.u. (equal to 2 %) of the parameter
Max. (Non-phs sel.)
and can be adjusted.
Parameter: Min. active/Min. Trigger/Min. hysteresis
•
Default setting
(_:9751:102) Min. active
=
yes
•
Default setting
(_:9751:106) Min. (Non-phs sel.)
=
0.800 A
•
Default setting
(_:9751:121) Min. phs A
=
0.800 A
•
Default setting
(_:9751:122) Min. phs B
=
0.800 A
•
Default setting
(_:9751:123) Min. phs C
=
0.800 A
•
Default setting
(_:9751:114) Min. hysteresis
=
1.020 p.u.
With the
Min. active
parameter, you activate the level trigger in order to monitor the current of the funda-
mental component and prevent it from dropping below the set values.
Parameter Value
Description
yes
The current of the fundamental component is monitored for undercurrent.
no
The current of the fundamental component is not monitored for undercur-
rent.
If the
Min. trigger
does not operate phase-selectively, the set threshold value of the parameter
Min.
(Non-phs sel.)
applies to all phases.
If the
Min. trigger
operates phase-selectively, set the threshold values for the
Min. trigger
separately
for each phase. Then, the parameters
Min. phs A
,
Min. phs B
, and Min. phs C are effective.
The hysteresis is preset at the factory to 1.020 p.u. (equal to 2 %) of the parameter
Min. (Non-phs sel.)
and can be adjusted.
PardM/dt dM/dt/+dM/dt hysteresis
•
Default setting
(_:9751:103) +dM/dt active
=
no
•
Default setting
(_:9751:107) +dM/dt (Non-phs sel.)
=
0.300 A
•
Default setting
(_:9751:124) +dM/dt phs A
=
0.300 A
•
Default setting
(_:9751:125) +dM/dt phs B
=
0.300 A
•
Default setting
(_:9751:126) +dM/dt phs C
=
0.300 A
•
Default setting
(_:9751:115) +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 positive gradi-
ents of the current of the fundamental component, using the set filtering time (input in periods).
Parameter Value
Description
yes
The positive gradient of the current of the fundamental component is moni-
tored.
Fault Recorder
7.5 Trigger Functions 3-Phase
316
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
Summary of Contents for SIPROTEC 5
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