GE MiCOM P747 Agile User Manual

4 MEASUREMENTS
4.1 MEASURED QUANTITIES
The device measures directly and calculates a number of system quantities, which are updated every
second. You can view these values in the MEASUREMENTS columns or with the Measurement Viewer in
the settings application software. Depending on the model, the device may measure and display some or
more of the following quantities:
● Measured and calculated analogue current and voltage values
● Power and energy quantities
● Peak, fixed and rolling demand values
● Frequency measurements
● Others measurements
4.1.1 MEASURED AND CALCULATED CURRENTS
The device measures phase-to-phase and phase-to-neutral current values. The values are produced by
sampling the analogue input quantities, converting them to digital quantities to present the magnitude and
phase values. Sequence quantities are produced by processing the measured values. These are also
displayed as magnitude and phase angle values. RMS values are calculated using the sum of the samples
squared over a cycle of sampled data.
These measurements are contained in the MEASUREMENTS 1 column.
4.1.2 MEASURED AND CALCULATED VOLTAGES
The device measures phase-to-phase and phase-to-neutral voltage values. The values are produced by
sampling the analogue input quantities, converting them to digital quantities to present the magnitude and
phase values. Sequence quantities are produced by processing the measured values. These are also
displayed as magnitude and phase angle values. RMS values are calculated using the sum of the samples
squared over a cycle of sampled data.
These measurements are contained in the MEASUREMENTS 1 column.
4.1.3 POWER AND ENERGY QUANTITIES
Using the measured voltages and currents the device calculates the apparent, real and reactive power
quantities. These are produced on a phase by phase basis together with three-phase values based on the
sum of the three individual phase values. The signing of the real and reactive power measurements can be
controlled using the measurement mode setting. The four options are defined in the table below:
Measurement Mode Parameter Signing
0
(Default)
Export Power
Import Power
Lagging Vars
Leading VArs
+
–
+
–
1
Export Power
Import Power
Lagging Vars
Leading VArs
–
+
+
–
2
Export Power
Import Power
Lagging Vars
Leading VArs
+
–
–
+
Chapter 6 - Monitoring and Control MiCOM P747
162 P747-TM-EN-1
P747-TM-EN-1.1

GE MiCOM P747 Agile Specifications

General

Brand	GE
Model	MiCOM P747 Agile
Category	Protection Device
Language	English