ABB ret650, Technical Manual

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14.4.6.6 Disturbance recorder
Disturbance recorder records analog and binary signal data before, during and after
the fault, see Disturbance recorder section for detailed information.
14.4.6.7 Time tagging
The IED has a built-in real-time calendar and clock. This function is used for all time
tagging within the disturbance report
14.4.6.8 Recording times
Disturbance report DRPRDRE records information about a disturbance during a
settable time frame. The recording times are valid for the whole disturbance report.
Disturbance recorder, event recorder and indication function register disturbance data
and events during tRecording, the total recording time.
The total recording time, tRecording, of a recorded disturbance is:
tRecording = PreFau PostFaultrecT or PreFau TimeLimit, depending on which
criterion stops the current disturbance recording
PreFaultRecT
TimeLimit
PostFaultRecT
en05000487.vsd
1 2 3
Trig point
IEC05000487 V1 EN
Figure 206: 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
PreFaultRecT to set this time.
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
TimeLimit the limit
time).
PostFaultRecT, 3 Post fault recording time. The time the disturbance recording continues after all
activated triggers are reset. Use the setting
PostFaultRecT to set this time.
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 TimeLimit to set this time.
1MRK 504 135-UEN A
Section 14
Monitoring
469
Technical manual