S&C Instruction Sheet 766-540 23
Metering
Figure 13. The Metering screen.
All values are time-averaged and reported locally and via SCADA on a one-second
interval. See Figure 13.
Primary Metering Data
X-Side and Y-Side Voltage—
True RMS values of phase voltages in volts (Either
the Phase-Ground or Phase-Phase measurement setting is configured in the
Voltage
Reporting
setpoint on the
Setup>General>Site-Related>System
screen.)
Current—
True RMS values of phase current in amperes (Fundamental (phasor)
derivatives are calculated for the residual current.)
Power Factor—
True per-phase power factor, based on the X-side voltages, displayed in
kilowatts (Power factor is calculated as the cosine of the corrected phase angle. Leading
power factor is represented by a negative number.)
Power—
True per-phase and three-phase total power in kW based on X-side phase voltages
Reactive Power—
Measured reactive power displayed in kvars and based on X-side
phase voltages
Energy—
Phase energy and three-phase total energy, in total kilowatt hours, accumulated
since the last
Reset MWh
command, based on X-side and Y-side phase voltages
Reset MWh—
Resets all energy readings to zero when the
Reset MWh
button is clicked
on
Voltage Reporting—
System-voltage measurements displayed as either Phase-to-Phase
or Phase-to-Ground
System Frequency—
Measured system frequency displayed in Hertz
Current Direction—
Indicates the direction of current flow, either Direction 1 or
Direction 2
System Phase Rotation—
Indicates the detected system phase rotation as 123, 132, or
Indeterminate