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Frequency number of full voltage or current cycles in one second.
Fundamental component: component at the fundamental frequency.
Harmonics in electrical systems, voltages and currents at frequencies that are multiples of the fundamental frequency.
Hz Frequency of the network.
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 order n.
L Phase of a polyphased electrical power network.
MAX Maximum value.
Measurement method: Any measurement method associated with an individual measurement.
MIN Minimum value.
Nominal voltage: Reference voltage of a network.
Order of a harmonic: ratio of the frequency of the harmonic to the fundamental frequency; a whole number.
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.
RMS RMS (Root Mean Square) value of current or voltage. Square root of the mean of the squares of the instantaneous

S Abbreviation for apparent power.
tan Φ Ratio of reactive power to active power.
THD Total Harmonic Distortion. The total harmonic distortion describes the proportion of the harmonics of a signal with
respect to the RMS value of the fundamental or to the total RMS value without DC.
U Phase-to-phase voltage.
U-CF Phase-to-phase voltage crest factor
u2 Phase-to-neutral voltage unbalance.
Ux-Hn Phase-to-phase voltage (value or percentage) for harmonic order n.
Uxy-THD Total phase-to-phase voltage harmonic distortion
V 
V-CF Voltage crest (peak) factor
VA Apparent power unit (Volt-Ampere).
var Reactive power unit.
varh Reactive energy unit.
V-THD Total harmonic distortion of phase-to-neutral voltage.
Voltage unbalance in a polyphased electrical power network: State in which the RMS voltages between conductors (fundamental
󰀨
Vx-Hn Phase-to-neutral voltage (value or percentage) for harmonic order n.
W Active power unit (Watt).
Wh Active energy unit (Watt-hour).

Prex Symbol Multiplies by
milli m 10-3
kilo k 103
Mega M 106
Giga G 109
Tera T 1012
Peta P 1015
Exa E 1018
78


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