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7
7.2 Fault Recorders
68
Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
Prefault time
The measured values are recorded continuously and stored in a ring buffer with a capacity of up
to one second. In case of a fault, the prefault of the trigger event will be written to the beginning
of the recording (see figure 7-5). The prefault time is applied in the same way for all trigger
causes.
Figure 7-5 Composition of the fault record of prefault time, trigger and recording time
Recording time
The parameterizable recording time of the TAR is maximum 30 s, it is equal for all trigger causes.
The recording time for manual triggers can be adjusted separately. For external triggers, the
recording time cannot be parameterized. Recording is continued, as long as the external signal
is provided. The maximum recording time is 30 s.
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
will be extended to a maximum of 30 s (see figure 7-6).
Table 7-12 Trigger values of the DAUs for acquiring process and binary signals
(the length of dt is two periods for the TAR)
DDAU BDAU
D
1
, D
2
, D
3
, D
4
dD
1
/dt, dD
2
/dt
dD
3
/dt, dD
4
/dt
D
5
, D
6
, D
7
, D
8
dD
5
/dt, dD
6
/dt
dD
7
/dt, dD
8
/dt
B
1
to B
16
B
1
to B
32
Fault record
Prefault time
Recording time
Channel A
Trigger
t
t
Recording of fault record