Length Of Recordings - ABB RELION REX640 Technical Manual

Section 8
Measurement functions
8.2.3.3
1334
corresponding analog channel. Both high-level and low-level violation triggering can
be active simultaneously for the same analog channel. If the duration of the limit
violation condition exceeds the filter time of approximately 50 ms, the recorder
triggers. In case of a low-level limit violation, if the measured value falls below
approximately 0.05 during the filter time, the situation is considered to be a circuit
breaker operation and therefore, the recorder does not trigger. This is useful especially
in undervoltage situations. The filter time of approximately 50 ms is common to all the
analog channel triggers of the disturbance recorder. The value used for triggering is
the calculated peak-to-peak value. Either high or low analog channel trigger can be
disabled by setting the corresponding trigger level parameter to zero.
Frequency cannot be used as a trigger to disturbance recorder.
Manual triggering
The recorder can be triggered manually via the LHMI or via communication by setting
the Trig recording parameter to "Trig".
Periodic triggering
Periodic triggering means that the recorder automatically makes a recording at certain
time intervals. The interval can be adjusted with the Periodic trig time parameter. If
the value of the parameter is changed, the new setting takes effect when the next
periodic triggering occurs. Setting the parameter to zero disables the triggering
alternative and the setting becomes valid immediately. If a new non-zero setting needs
to be valid immediately, the Periodic trig time parameter should first be set to zero and
then to the new value. The time remaining to the next triggering can be monitored with
the Time to trigger monitored data which counts downwards.

Length of recordings

The recording length can be defined with the Record length parameter. The length is
given as the number of fundamental cycles.
According to the memory available and the number of analog channels used, the
disturbance recorder automatically calculates the remaining number of recordings
that fit into the available recording memory. This information can be seen with the
Rem. amount of rec. monitored data. The fixed memory size allocated to the recorder
can fit in two recordings that are ten seconds long. The recordings contain data from
all analog and binary channels of the disturbance recorder, at the sample rate of 32
samples per fundamental cycle.
The number of recordings in the memory can be viewed with the Number of
recordings monitored data. The used memory space can be viewed with the Rec.
memory used monitored data. It is shown as a percentage value.
1MRS759142 C
REX640
Technical Manual