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Appendix
Total Arithmetic True PF
Total Real Power divided by Total Arithmetic VoltAmperes.
Total Arithmetic VA
Arithmetic sum of individual phase volt-ampere values.
Total Fundamental Arithmetic VA
Arithmetic sum of the volt amperes of the fundamental
frequency components of each phase.
Total Fundamental Vector VA
Square root of (fundamental frequency component of
WATTs squared + fundamental VARs squared).
Total Power
Arithmetic sum of phase Watts.
Total Reactive Power
Arithmetic sum of phase VARs.
Total Vector VA
Square root of (total WATTs squared + total VARs
squared).
Transformer
A device used for changing the voltage of an AC circuit
and/or isolating a circuit from its power source.
Transient
A subcycle disturbance in the AC waveform that is evidenced by a sharp, brief discontinuity of the waveform.
May be of either polarity and may be additive to or subtractive from the nominal waveform.
Trend
A plot of an event characteristic versus time.
F
True Phase Power or Real Power
Measured in watts, of each phase, calculated over 1 second from cycle-by-cycle power values (voltage sample *
current sample). Not valid for delta configurations.
Volt
The quantitative measurement of electrical force or potential also called electromotive force.
Voltage
The force of electricity in a circuit as expressed in volts.
It is the measure of work it takes to move a charge
through a circuit.
Waveform
The graphic form of an electrical power.
Waveshape Fault
A cycle-to-cycle change in the voltage waveform characteristic. A waveshape fault may not be large enough or
fast enough to have impulse characteristics, and at the
same time, may not add or subtract significantly from the
voltage to create a sag or swell. Waveshape faults can be
caused by loose wiring, switching between two power
sources, etc. Waveshape faults can cause damage and disruption to all types of loads.
Worst Displacement PF
Displacement PF of phase with largest deviation from 1.
Worst PF
True PF of the individual phase with largest deviation
from 1.
Zero Sequence
U0a = 1/3 (Ua + Ub + Uc).
True PF
Total Real Power divided by Total VA.
A-11
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