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7
7.2 Fault Recorders
84
Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
If a trigger condition is detected, the SIMEAS R-PMU starts recording.
The recording time is restarted by retriggering (trigger 2) during recording, thus the fault record
is extended (see figure 7-13).
Figure 7-13 Retriggering during recording
If a trigger event (trigger 3) occurs shortly after the end of a fault recording (fault record 1), the
prefault time of the second recording (fault record 2) overlaps with the first recording (see figure
7-14).
Figure 7-14 Overlap of two fault recordings in the prefault time range
7.2.2.2.1 Analog Signal Triggers
The Transient Phasor Recorder provides several options for triggering to analog input signals.
The level and gradient trigger can also be applied to analog signals.
Fault record
Channel A
Recording time (restart)
Trigger 2
Recording time
Prefault
time
t
t
Trigger 1
Recording of fault record
Trigger 1
Channel A
Recording time (restart)
Trigger 2 Trigger 3
Recording time
Prefault
time
Recording time
Prefault
time
t
t
Recording of fault record 2
Recording of fault record 1
Fault record
Table 7-20 Options of analog signal triggering
Measured value Triggering
AC values
DC values
rms value of one period
Arithmetic mean over the complete
recording interval