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 255:
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 502 048-UUS A
Section 14
Monitoring
571
Technical manual
