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A.6 GLOSSARY OF TERMS
Symbol or Terminology Description
AC and DC components.
AC component only.
DC component only.
Inductive phase shift.
Capacitive phase shift.
°
Degree.
%
Percentage.
CF
Crest factor (Peak Factor) in current or voltage: ratio of the peak value of a signal to the RMS value.
Cos ϕ
Cosine of the phase shift of the fundamental voltage with respect to the fundamental current.
DC
DC component (current or voltage)
Ep
Abbreviation for active energy.
Eq
Abbreviation for reactive energy.
Es
Abbreviation for apparent energy.
Frequency
Fundamental
Component
Number of full voltage or current cycles in one second.
Component at the fundamental frequency.
Hz
In electrical systems, voltages and currents at frequencies that are multiples of the fundamental
frequency.
Frequency of network studied.
I
Abbreviation for current.
I-CF
Crest (peak) factor of current.
I-THD
Total harmonic distortion of current.
Ix-Hh
Current value or percentage for harmonic rank n.
L
Phase (Line).
MAX
Maximum value
Measurement Method
All measurement methods associated to an individual measurement.
MIN
Minimum value
Nominal Voltage
Reference voltage of a network.
P
Abbreviation for active power.
PF
Power Factor: ratio of active power to apparent power.
Phase
Temporal relationship between current and voltage in alternating current circuits.
Q
Abbreviation for reactive power.
Rank of a Harmonic
Ratio of the frequency of the harmonic to the fundamental frequency; a whole number.
RMS (Root Mean Square) value of current or voltage. Square root of the mean of the squares of the
instantaneous values of a quantity during a specified interval.
Abbreviation for apparent power.
Harmonics
RMS
S
Tan Φ
U
Ratio between reactive power and active power.
Total Harmonic Distortion. The total harmonic distortion describes the proportion of the harmonics of a
signal with respect to the fundamental RMS value (%f).
Phase-to-phase voltage
U-CF
Phase-to-phase voltage crest factor
Uh
Unbalance in voltage in
a polyphased electrical
power network
Ux-Hn
Phase-to-phase voltage harmonic
Uxy-THD
Total phase-to-phase voltage harmonic distortion.
V
Abbreviation for phase-to-neutral voltage or the unit “volt”.
THD
94
Status where efficient values for voltages between conductors (fundamental component) and/or differences in phase between successive conductors are not equal.
Phase-to-phase voltage value or percentage for harmonic rank n.
Power & Energy Logger Model PEL 102 and PEL 103