User Manual

101
16.7. GLOSSARY
AC and DC components.
AC component only.
DC component only.
Inductive phase shift.
Capacitive phase shift.
° Degree.
-.+ Expert mode.
| | Absolute value.
Φ
VA
Phase shift of the phase-to-neutral (phase voltage) voltage with respect to the phase-to-neutral current (line cur-
rent).
Σ Value of the system.
% Percentage.
%f Fundamental value as reference (percentage of the fundamental).
%r Total value as reference (percentage of the total value).
A Phase-to-ground current (line current) or the unit “ampere”.
A-h Harmonic in current.
Acf Peak factor of the current.
Ad RMS distortion current.
Adc DC current.
Apk+ Maximum peak value of the current.
Apk- Minimum peak value of the current.
Arms RMS current.
Athd Total harmonic distortion of the current.
Athdf Harmonic distortion of the current with the RMS value of the fundamental as reference.
Athdr Harmonic distortion of the current with the total RMS value without DC as reference.
Aunb Negative-sequence current unbalance rate.
AVG Mean value (arithmetic mean).
Blackout: fall of voltage, at some point in the power network, to below a specified threshold.
BTU British Thermal Unit.
CF Peak factor (Crest Factor) in current or voltage: ratio of the peak value of a signal to the RMS value.
Channel and phase: a measurement channel corresponds to a difference in potential between two conductors. A phase is a
single conductor. In polyphased systems, a measurement channel may be between two phases, or between a
phase and neutral, or between a phase and earth, or between neutral and earth.
cos Φ Cosine of the phase shift of the voltage with respect to the current (displacement factor – DPF).
D Distortion power.
Dip threshold: specific voltage used to define the beginning and end of a voltage dip.
DC DC component (current or voltage).
Dh Distortion energy.
DPF Displacement factor (cos Φ).
E Exa (10
18
)
FK K factor. Used to quantify the effect of a load on a transformer.
FHL Harmonic loss factor.
Flicker a visual effect of voltage variations.
Frequency number of full voltage or current cycles in one second.
Fundamental component: component at the fundamental frequency.
G Giga (10
9
)
Harmonics in electrical systems, voltages and currents at frequencies that are multiples of the fundamental frequency.
Hysteresis difference between thresholds for reciprocal changes of state.
Hz Frequency of the network.
J Joule
k kilo (10
3
)
L Channel (Line).