Siemens SIPROTEC 5 Manual page 316

Fault Recorder
7.5 Trigger Functions 3-Phase
Parameter Value
yes
no
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
yes
no
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.
Parameter:+dM/dt active/+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
yes
316
Description
The current of the fundamental component is monitored for overcurrent.
The current of the fundamental component is not monitored for overcur-
rent.
Description
The current of the fundamental component is monitored for undercurrent.
The current of the fundamental component is not monitored for undercur-
rent.
Description
The positive gradient of the current of the fundamental component is moni-
tored.
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017