ABB REC 561 User Manual page 592

ABB Network Partner AB
Version 1.0-00
4 Setting
Disturbance recorder
The RAM area for temporary storage of recorded data is divided into sub-
areas, one for each recording. The size of a subarea is governed by the
sum of the set pre-fault (tPre) and maximum post-triggering (tLim) time.
There is a sufficient memory capacity for at least four consecutive record-
ings with a maximum number of analogue channels recorded and with
maximum time settings. Should no such area be free at the time of a new
triggering, the oldest recording stored in the RAM is overwritten.
When a recording is completed, a post recording processing occurs.
This post-recording processing comprises:
• Merging the data for analogue channels with corresponding data for
binary signals stored in an event buffer
• Compression of the data, which is performed without losing any data
accuracy
• Storing the compressed data in a non-volatile memory (flash mem-
ory)
The recorded disturbance is now ready for retrieval and evaluation. The
recording comprises the stored and time-tagged disturbance data along
with relevant data from the database for configuration and parameter set-
up.
Some parameters in the header of a recording are stored with the record-
ing, and some are retrieved from the parameter database in connection
with a disturbance. Table 1 indicates where the various parameters are
stored. This means that if a parameter that is retrieved from the parameter
database was changed between the time of recording and retrieval, the
collected information is not correct in all parts. So, all recordings should
be transferred to the Station Monitoring System (SMS) workstation and
then deleted in the terminal before any such parameters are changed.
The setting parameters specific for the disturbance recording function are
available in the menu tree under:
Settings
DisturbReport
Operation
RecordingTimes
BinarySignals
AnalogSignals
The list of parameters in the appendix attached to the "Disturbance report
- Settings", document no. "1MRK 580 133-XEN", explains the meaning
of the abbreviations used in connection with setting ranges.
Remember that values of parameters set elsewhere in the menu tree are
linked to the information on a recording. Such parameters are, for exam-
ple, station and object identifiers, CT and PT ratios.
1MRK 580 141-XEN
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