4.2
SEL-734 Meter Instruction Manual Date Code 20090730
Metering
Four-Quadrant VAR Metering
Four-Quadrant VAR Metering
The SEL-734 calculates four-quadrant voltampere reactive (VAR) values
following the IEEE VAR sign convention as illustrated in Figure 4.1.
Appendix H: Analog Quantities lists each four-quadrant VAR reported by the
meter.
Figure 4.1 IEEE VAR Sign Convention
The SEL-734 displays VARs in four separate quadrants I–IV: IN-Lagging (I),
IN-Leading (II), OUT-Lagging (III), and OUT-Leading (IV). The notations,
IN and OUT, used by the SEL-734 are synonymous with delivered and
received as shown in Figure 4.2.
III
III IV
(+) Reactive
(–) Reactive
(+) Active
Energy
Delivered
(–) Active
Energy
Received
Quadrant Power Factor Watts Vars
I
II
III
IV
Lag
Lag
Lead
Lead
Delivered (+)
Delivered (+)
Received (–)
Received (–)
Delivered (+)
Delivered (+)
Received (–)
Received (–)
θ Lagging
θ Lagging
θ Leading
θ Leading
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
