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1MRK 505 288-UEN A
12.4.6.9
Technical manual
The total recording time, tRecording, of a recorded disturbance is:
PreFaultrecT + tFault + PostFaultrecT or PreFaultrecT + TimeLimit , depending on which
tRecording =
criterion stops the current disturbance recording
Trig point
PreFaultRecT
1
IEC05000487 V1 EN
Figure 161:
The recording times definition
PreFaultRecT, 1
Pre-fault or pre-trigger recording time. The time before the fault including the operate
time of the trigger. Use the setting
tFault, 2
Fault time of the recording. The fault time cannot be set. It continues as long as any
valid trigger condition, binary or analog, persists (unless limited by
time).
PostFaultRecT, 3 Post fault recording time. The time the disturbance recording continues after all
activated triggers are reset. Use the setting
TimeLimit
Limit time. The maximum allowed recording time after the disturbance recording was
triggered. The limit time is used to eliminate the consequences of a trigger that does
not reset within a reasonable time interval. It limits the maximum recording time of a
recording and prevents subsequent overwriting of already stored disturbances. Use
the setting
Analog signals
Up to 40 analog signals can be selected for recording by the Disturbance recorder and
triggering of the Disturbance report function. Out of these 40, 30 are reserved for
external analog signals from analog input modules via preprocessing function blocks
(SMAI) and summation block (3PHSUM). The last 10 channels may be connected to
internally calculated analog signals available as function block output signals (phase
differential currents, bias currents and so on).
TimeLimit
PostFaultRecT
2
PreFaultRecT to set this time.
TimeLimit to set this time.
Section 12
Monitoring
3
en05000487.vsd
TimeLimit the limit
PostFaultRecT to set this time.
371
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