Measurements and Recording P746/EN MR/A11
MiCOM P746 (MR) 8-
15
MR
Setting Range
Menu Text Default Setting
Min. Max.
Step Size
Input 26 Trigger No Trigger No Trigger, Trigger L/H, Trigger H/L
Digital Input 27 Diff CZ Blked As above
Check Zone Busbar Diff in Block Status
Input 27 Trigger No Trigger No Trigger, Trigger L/H, Trigger H/L
Digital Input 28 Fault A As above
Phase A fault.
Input 28 Trigger No Trigger No Trigger, Trigger L/H, Trigger H/L
Digital Input 29 Fault B As above
Phase B fault
Input 29 Trigger No Trigger No Trigger, Trigger L/H, Trigger H/L
Digital Input 30 Fault C As above
Phase C fault
Input 30 Trigger No Trigger No Trigger, Trigger L/H, Trigger H/L
Digital Input 31 Fault N As above
Earth fault
Input 31 Trigger No Trigger No Trigger, Trigger L/H, Trigger H/L
Digital Input 32 Function key 10 As above
Function Key 10 activated (in ‘Normal’ mode it is high on keypress and in ‘Toggle’ mode
remains high/low on single keypress)
Input 32 Trigger Trigger L/H No Trigger, Trigger L/H, Trigger H/L
The pre and post fault recording times are set by a combination of the "Duration" and
"Trigger Position" cells. "Duration" sets the overall recording time and the "Trigger Position"
sets the trigger point as a percentage of the duration. For example, the default settings
show that the overall recording time is set to 1.5s with the trigger point being at 33.3% of
this, giving 0.5s pre-fault and 1.0s post fault recording times.
If a further trigger occurs whilst a recording is taking place, the recorder will ignore the trigger
if the "Trigger Mode" has been set to "Single". However, if this has been set to "Extended",
the post trigger timer will be reset to zero, thereby extending the recording time.
As can be seen from the menu, each of the analog channels is selectable from the available
analog inputs to the relay. The digital channels may be mapped to any of the opto isolated
inputs or output contacts, in addition to a number of internal relay digital signals, such as
protection starts, LEDs etc. The complete list of these signals may be found by viewing the
available settings in the relay menu or via a setting file in MiCOM S1 V2 or MiCOM S1
Studio. Any of the digital channels may be selected to trigger the disturbance recorder on
either a low to high or a high to low transition, via the "Input Trigger" cell.
It is not possible to view the disturbance records locally via the LCD; they must be extracted
using suitable software such as MiCOM S1. This process is fully explained in the SCADA
Communications section (P746/EN SC).
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