Siemens SIPROTEC 5 Manual page 304

Fault Recorder
7.5 Trigger Functions 3-Phase
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(AB), Min. phs B(BC), and Min. phs C(CA) 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 (_:9601:103) +dM/dt active = no
•
Default setting (_:9601:107) +dM/dt (Non-phs sel.) = 20.000 V
•
Default setting (_:9601:124) +dM/dt phs A(AB) = 20.000 V
•
Default setting (_:9601:125) +dM/dt phs B(BC) = 20.000 V
•
Default setting (_:9601:126) +dM/dt phs C(CA) = 20.000 V
•
Default setting (_:9601:115) +dM/dt hysteresis = 0.980 p.u.
•
Default setting (_:9601:112) 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 RMS value of the voltage using the set filtering time (input in periods).
Parameter Value
yes
no
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(AB), +dM/dt phs B(BC), and +dM/dt phs C(CA)
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/-dM/dt hysteresis
•
Default setting (_:9601:104) -dM/dt active = no
•
Default setting (_:9601:108) -dM/dt (Non-phs sel.) = 20.000 V
•
Default setting (_:9601:127) -dM/dt phs A(AB) = 20.000 V
•
Default setting (_:9601:128) -dM/dt phs B(BC) = 20.000 V
•
Default setting (_:9601:129) -dM/dt phs C(CA) = 20.000 V
•
Default setting (_:9601:116) -dM/dt hysteresis = 0.980 p.u.
•
Default setting (_:9601:112) 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 RMS value of the voltage using the set filtering time (input in periods).
Parameter Value
yes
304
Description
The RMS value of the voltage is monitored for undervoltage.
The RMS value of the voltage is not monitored for undervoltage.
Description
The positive gradient of the RMS value of the voltage is monitored.
The positive gradient of the RMS value of the voltage is not monitored.
Description
The negative gradient of the RMS value of the voltage is monitored.
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017