GL.9
Date Code 20090730 Instruction Manual SEL-734 Meter
Glossary
Real Power (P)āSEL
OGIC Expression Builder
Real Power (P)
Power that produces actual work. The portion of apparent power that is real,
not imaginary.
Real Power
Average (P
AV E
)
Real power averaged over a one-second interval.
Real Power
Three Phase (P3P)
Three-phase real power measured in watts.
Reactive Power (Q)
Reactive power measured in volt-amps reactive (VAR). The product of the
voltage and current multiplied by the sine of the angle between the two.
Reactive Power
Average (Q
AV E
)
Reactive power (Q) average over a one-second interval. Q
AV E
is forced to zero
when the apparent power (S) is less than or equal to real power (P) ā¢ 0.001.
Reactive Power
Three Phase (Q3P)
Three-phase instantaneous reactive power measured in volt-amps reactive
(VAR).
Register
An electromechanical or electronic device which stores and displays metering
quantities, e.g., kWh, kW demand. In solid-state meters, meter data quantities
are often referred to as āregisters.ā
Remapping
The process of selecting data from the default map and configuring new
indices to form a smaller data set optimized to your application.
Remote Bit
A Meter Word bit with a state that is controlled by serial port commands,
including the CONTROL command, a binary Fast Operate command, DNP
binary output operation, or a UCA control operation.
Report Settings
Event report and Sequential Events Recorder settings.
Residual Current
The sum of the measured phase currents. In normal, balanced operation, this
current is very small or zero.
Rising Edge
Transition from logical 0 to logical 1, or the beginning of an operation.
RMS
Root-mean-square. This is the effective value of the current and voltage
measured by the meter, accounting for the fundamental frequency and higher-
order harmonics in the signal.
Rolling Demand
A sliding time-window arithmetic average in demand metering.
RTU
Remote Terminal Unit.
RXD
Received data.
SCADA
Supervisory control and data acquisition.
Self-Contained Meter
A watt-hour meter that is connected directly to the supply voltage and is in
series with the customer loads. Residential meters are almost always self-
contained meters.
Self-Test
A function that verifies the correct operation of a critical device subsystem
and indicates detection of an out-of-tolerance condition. The SEL-734 has
self-tests that validate the meter power supply, microprocessor, memory, and
other critical systems.
SELOGIC
Expression Builder
A rules-based editor within the ACSELERATOR QuickSet software program for
programming SEL
OGIC control equations.
Courtesy of NationalSwitchgear.com
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