Application And Setting Notes - Frequency Trigger - Siemens SIPROTEC 5 Manual

Max. Trigger/Min. Trigger
With the parameters Max. trigger and Min. trigger, you can define from which threshold value the
activated level trigger starts a fault record.
dM/dt Rise Active - dM/dt Drop Active
With the parameters dM/dt rise active and dM/dt drop active, you can define whether the respec-
tive gradient trigger is active or inactive.
Filter Time
With the Filter time parameter, you define the number of periods with which the gradient is determined.
Gradient Trigger for Rising and Dropping Gradients of the Power Frequency
With the parameters dM/dt rise (/Filter time) and dM/dt drop (/Filter time), you define
from which threshold value within the set filtering time a fault record is started.
7.4.3.4

Application and Setting Notes - Frequency Trigger

Parameter: Mode
•
Default setting (_:9721:1) Mode = off
With the Mode parameter, you activate the trigger for normal operation (On) or the test mode (Test).
Parameter Value
on
off
test
Parameter: Max. Trigger Active/Max. Trigger/Max. Trigger Hysteresis
•
Default setting (_:9721:101) Max. trigger active = yes
•
Default setting (_:9721:102) Max. trigger = 50.200 Hz
•
Default setting (_:9721:113) Max. trigger hysteresis = 0.998 p.u.
With the Max. trigger active parameter, you activate the level trigger in order to monitor the power
frequency and to prevent it from exceeding the set values.
Parameter Value
yes
no
The hysteresis is preset at the factory to 0.998 p.u. (equal to 0.2 %) of the parameter Max. trigger and can
be adjusted.
Parameter: Min. Trigger Active/Min. Trigger/Min. Trigger Hysteresis
•
Default setting (_:9721:103) Min. trigger active = yes
•
Default setting (_:9721:104) Min. trigger = 49.600 Hz
•
Default setting (_:9721:114) Min. trigger hysteresis = 1.002 p.u.
With the Min. trigger active parameter, you activate the level trigger in order to monitor the power
frequency and prevent it from dropping below the set value.
Parameter Value
yes
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
Description
Function block Trigger f is activated and the power frequency monitored
according to the set trigger parameters.
Function block Trigger f is deactivated.
Function block Trigger f is activated for test purposes.
Description
The power frequency is monitored for exceeding the set values.
The power frequency is not monitored for exceeding the set values.
Description
The power frequency is monitored for dropping below the set value.
Fault Recorder
7.4 Trigger Functions 1-Phase
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