P74x/EN SC/N
1, P742, P743 (SC) 13-
2.5.4 Manual event record extraction
Column 01 of the database can be used for manual viewing of event, fault, and maintenance
records. The contents of this column will depend on the nature of the record selected. It is
possible to select events by event number and to directly select a fault record or
maintenance record by number.
Event Record Selection (Row 01) - This cell can be set to a value between 0 to 511 to select
which of the 512 stored events is selected, 0 will select the most recent record; 511 the
oldest stored record. For simple event records, (Type 0) cells 0102 to 0105 contain the
event details. A single cell is used to represent each of the event fields. If the event
selected is a fault or maintenance record (Type 3) then the remainder of the column will
contain the additional information.
Fault Record Selection (Row 05) – This cell can be used to directly select a fault record
using a value between 0 and 4 to select one of up to five stored fault records. (0 will be the
most recent fault and 4 will be the oldest). The column will then contain the details of the
fault record selected.
Maintenance Record Selection (Row F0) – This cell can be used to select a maintenance
record using a value between 0 and 4 and operates in a similar way to the fault record
selection.
It should be noted that if this column is used to extract event information from the relay the
number associated with a particular record will change when a new event or fault occurs.
2.6 Disturbance record extraction
Select Record Number (Row 01) - This cell can be used to select the record to be extracted.
Record 0 will be the oldest unextracted record, already extracted older records will be
assigned positive values, and negative values will be used for more recent records. To
facilitate automatic extraction via the rear port the disturbance bit of the status byte is set by
the relay whenever there are unextracted disturbance records.
Once a record has been selected, using the above cell, the time and date of the record can
be read from cell 02. The disturbance record itself can be extracted using the block transfer
mechanism from cell B00B.
As has been stated, the rear Courier port can be used to automatically extract disturbance
records as they occur. This operates using the standard Courier mechanism defined in
Chapter 8 of the Courier User Guide. The front Courier port does not support automatic
extraction although disturbance record data can be extracted manually from this port.
2.7 Programmable scheme logic settings
The programmable scheme logic (PSL) settings can be uploaded from and downloaded to
the relay using the block transfer mechanism.
The following cells are used to perform the extraction:
− B204 Domain: Used to select either PSL settings (Upload or download) or
PSL configuration data (Upload only)
− B208 Sub-Domain: Used to select the Protection Setting Group to be
uploaded/downloaded.
− B20C Version: Used on a download to check the compatibility of the file to be
downloaded with the relay.
− B21C Transfer Mode: Used to set-up the transfer process.
− B120 Data Transfer Cell: Used to perform upload/download.
The programmable scheme logic settings can be uploaded and downloaded to and from the
relay using this mechanism. If it is necessary to edit the settings S1 must be used as the
data format is compressed. S1 also performs checks on the validity of the settings before
they are downloaded to the relay.
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