P746/EN MR/A11 Measurements and Recording
(MR) 8-
6
MiCOM P746
MR
VIEW RECORDS
LCD Reference Description
IC Z2 Diff Differential phase C current of the zone 2
IA Z2 Bias Bias phase A current of the zone 2
IB-Z2 Bias Bias phase B current of the zone 2
IC Z2 Bias Bias phase C current of the zone 2
IA CZ Diff Differential phase A current of the check zone
IB-CZ Diff Differential phase B current of the check zone
IC CZ Diff Differential phase C current of the check zone
IA CZ Bias Bias phase A current of the check zone
IB-CZ Bias Bias phase B current of the check zone
IC CZ Bias Bias phase C current of the check zone
Evt Iface Source Event Interface source
Evt Access Level Event access level
Evt Extra Info Event Extra Information
Evt Unique Id Event Unique identification
Reset Indication
Either Yes or No. This serves to reset the trip LED
indications provided that the relevant protection element has
reset, to reset all LED and relays latched in the PSL, and to
reset the latched alarms.
For extraction from a remote source via communications, refer to the SCADA
Communications section (P746/EN CT), where the procedure is fully explained.
1.2.1 Types of event
An event may be a change of state of a control input or output relay, an alarm condition,
setting change etc. The following sections show the various items that constitute an event:
1.2.1.1 Change of state of opto-isolated inputs
If one or more of the opto (logic) inputs has changed state since the last time that the
protection algorithm ran, the new status is logged as an event. When this event is selected
to be viewed on the LCD, three applicable cells will become visible as shown below:
Time & date of event
“LOGIC INPUTS1”
“Event Value 0101010101010101”
The Event Value is a 32-bit word showing the status of the opto inputs, where the least
significant bit (extreme right) corresponds to opto input 1 etc. The same information is
present if the event is extracted and viewed via PC.
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