Analog Signals - Hitachi Relion 650 Series Technical Manual

1MRK 511 557-UEN Rev. A
PreFaultRecT
1
D0E12748T201305151403 V1 EN-US
Figure 103: The recording times definition
PreFaultRecT, 1
tFault, 2
PostFaultRecT, 3 Post fault recording time. The time the disturbance recording continues after all activated triggers
TimeLimit
12.4.6.9

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). 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).
Technical Manual
Trig point
2
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.
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).
are reset. Use the setting PostFaultRecT to set this time.
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.
© 2021 Hitachi Energy. All rights reserved.
TimeLimit
PostFaultRecT
3
en05000487.vsd
Section 12
Monitoring
GUID-3DA6D334-9EA6-450A-8ABF-3DE80E914463 v1
205