A6
Appendix4 Terminology
Active power Power that is consumed doing work.
Active power
demand value
The average active power used during a set period of interval time
(usually 30 minutes).
Apparent power
The (vector) power obtained by combining active power and reac-
tive power. As its name suggests, apparent power expresses the
“visible" power and comprises the product of the voltage and current
RMS values.
Binary data
All data other than text (character) data. Use binary data when ana-
lyzing data with the SF1001 Power Logger Viewer application.
Harmonics
A phenomenon caused by distortions in the voltage and current
waveform
s that affect many devices with power supplies using
semiconductor control devices. In the analysis of non-sine waves,
the term refers to one RMS value among the components with har-
monic frequencies.
Harmonic content
percentage
(PW3360-21 only)
The ratio of the K-order size to the size of the fundamental wave,
e
x
pressed as a percentage using the following equation:
K-order wave / fundamental wave × 100 [%]
By observing this value, it is possible to ascertain the harmonic
compon
ent content for individual orders. This metric provides a use-
ful way to track the harmonic content percentage when monitoring a
specific order.
Harmonics
phase angle
(PW3360-21 only)
The differences in phase of each harmonic order component and
th
e pha
se of the fundamental wave component is expressed as an
angle (°) and - indicates a LAG, whereas + indicates a LEAD.
The phase angle of harmonic power is expressed by the power fac-
tor of each order of harmonic converted into an angle (°). When the
h
arm
onic-power phase angle is between -90° and +90°(the polarity
of the harmonic active power is positive), the order of harmonic is
flowing in toward the load (inflow). When the phase angle is
between +90° and +180° or between -180° and -90° (the polarity of
the harmonic active power is negative), that order of harmonic is
flowing out from the load (outflow).
0°
90°
-90°
±180°
Harmonic phase angle
Voltage and current
phase difference
Outflow Inflow
LEAD
LAG
Voltage and current
phase angles
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