Alstom MiCOM P545 - 1.4 Measurements

P54x/EN MR/La4 Measurements and Recording
(MR) 8-10 MiCOM P543, P544, P545 & P546
MR
Setting range
Menu text Default setting
Min. Max.
Step size
Analog. Channel 11
N (P543/5)
IB2 (P544/6)
As above
Analog. Channel 12
N (P543/5)
IC2 (P544/6)
As above
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 1.5 s with the trigger point being at 33.3% of this, giving 0.5 s
pre-fault and 1s post fault recording times.
If a further trigger occurs while 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 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. The default trigger settings are that any
dedicated trip output contacts (e.g. relay 3) will trigger the recorder.
It is not possible to view the disturbance records locally via the LCD; they must be extracted
using suitable software such as MiCOM S1 Studio. This process is fully explained in the
SCADA Communications chapter (P54x/EN SC).
1.4 Measurements
The relay produ
ces a variety of both directly measured and calculated power system
quantities. These measurement values are updated on a per second basis and can be
viewed in the Measurements columns (up to three) of the relay or via MiCOM S1 Studio
Measurement viewer. The P54x relay is able to measure and display the following quantities
as summarized.
 Phase Voltages
 Local and Remote Currents
 Differential and Bias Currents on a Per Phase Basis
 Sequence Voltages and Currents
 Slip Frequency
 Power and Energy Quantities
 Rms. Voltages and Currents
 Peak, Fixed and Rolling Demand Values
There are also measured values from the protection functions, which are also displayed
under the measurement columns of the menu; these are described in the section on the
relevant protection function.