P54x/EN MR/La4 Measurements and Recording
(MR) 8-8
MiCOM P543, P544, P545 & P546
MR
Menu text Default setting Available settings
Maint. Rec. Event Enabled Enabled or Disabled
Disabling this setting means that no event will be generated for any occurrence that
produces a maintenance record.
Protection Event Enabled Enabled or Disabled
Disabling this setting means that any operation of protection elements will not be logged as
an event.
Flt Rec Extended Enabled Enabled or Disabled
When this setting is disabled, the fault record contains a snap shot of the local, remote,
differential and bias currents taken 1 cycle after the trip.
With this setting enabled an additional snap shot of local, remote, differential and bias
currents taken at the time the differential trips is included in the fault record.
DDB 31 - 0 11111111111111111111111111111111
Displays the status of DDB signals 0 - 31.
DDB 1791 - 1760 11111111111111111111111111111111
Displays the status of DDB signals 1791 - 1760
Note: Some occurrences will result in more than one type of event, e.g. a
battery failure will produce an alarm event and a maintenance record
event.
If the Protection Event setting is Enabled a further set of settings is revealed which allow the
event generation by individual DDB signals to be enabled or disabled.
For further information regarding events and their specific meaning, refer to Relay Menu
Database document (P54x/EN MD).
1.3 Disturbance recorder
The integ
ral disturbance recorder has an area of memory specifically set aside for record
storage. The number of records that may be stored by the relay is dependent upon the
selected recording duration. The relay can typically store a minimum of 20 records, each of
1.5 seconds duration. Relays for use with IEC 60870-5 CS 103 communication, however,
have the same total record length but the IEC 60870-5 CS 103 communication protocol
dictates that only 8 records (of 3 seconds duration) can be extracted via the rear port.
Disturbance records continue to be recorded until the available memory is exhausted, at
which time the oldest record(s) are overwritten to make space for the newest one.
The recorder stores actual samples that are taken at a rate of 48 samples per cycle.
Each disturbance record consists of twelve analog data channels and thirty-two digital data
channels. The relevant CT and VT ratios for the analog channels are also extracted to
enable scaling to primary quantities. Note that if a CT ratio is set less than unity, the relay
will choose a scaling factor of zero for the appropriate channel.
The DISTURBANCE RECORDER menu column is shown in the following table:
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