x/EN SC/Na7
-16 MiCOM P74
2.5 Event extraction
Events can be extracted either automatically (rear port only) or manually (either Courier
port). For automatic extraction all events are extracted in sequential order using the
standard Courier event mechanism, this includes fault/maintenance data if appropriate. The
manual approach allows the user to select events, faults, or maintenance data at random
from the stored records.
2.5.1 Automatic event extraction
(See Chapter 7 Courier User Guide, publication R6512)
This method is intended for continuous extraction of event and fault information as it is
produced. It is only supported via the rear Courier port.
When new event information is created the event bit is set within the status byte, this
indicates to the master device that event information is available. The oldest, unextracted
event can be extracted from the relay using the send event command. The relay will
respond with the event data, which will be either a Courier Type 0 or Type 3 event. The
Type 3 event is used for fault records and maintenance records.
Once an event has been extracted from the relay, the accept event can be used to confirm
that the event has been successfully extracted. If all events have been extracted then the
event bit will reset, if there are more events still to be extracted the next event can be
accessed using the send event command as before.
2.5.2 Event types
Events will be created by the relay under the following circumstances:
− Change of state of output contact
− Change of state of opto input
− Protection element operation
− Alarm condition
− Setting change
− Password entered/timed-out
− Fault record (Type 3 Courier Event)
− Maintenance record (Type 3 Courier Event)
2.5.3 Event format
The send event command results in the following fields being returned by the relay:
− Cell reference
− Timestamp
− Cell text
− Cell value
The menu database, P74x/EN MD, contains a table of the events created by the relay and
indicates how the contents of the above fields are interpreted. Fault records and
maintenance records will return a Courier Type 3 event, which contains the above fields
together with two additional fields:
− Event extraction column
− Event number
These events contain additional information that is extracted from the relay using the
referenced extraction column. Row 01 of the extraction column contains a setting that allows
the fault/maintenance record to be selected. This setting should be set to the event number
value returned within the record; the extended data can be extracted from the relay by
uploading the text and data from the column.
To Next Page
Loading...
