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T ERM IN OLOGY
Abbreviation Term
RS485
THD
P
QA
QV
SA
SV
Ea
ErA
EapV
EapA
F
I
I
N
I
NC
U
PF
A
1T N C928 25 0M0 201
Total harmonic dis-
tortion
Frequency
Phase current
Measured neutral
current
Calculated neutral
current
Voltage
Power factor Arith-
metic
Description
Communication interface standard from EIA (Elec-
tronics Industries Association, USA), operating on
voltages between 0V and +5V. RS-485 is more
noise resistant than RS-232C, handles data trans-
mission over longer distances, and can drive more
receivers.
It is defined as the ratio of the sum of the powers
of all harmonic components to the power of
the fundamental frequency.
Total active power of all phases
Total reactive power calculated by arithmetic
method
Total reactive power calculated by vector method
Total apparent power calculated by arithmetic
method
Total apparent power calculated by vector method
Total active energy
Total reactive energy arithmetic
Total apparent energy vector
Total apparent energy arithmetic
Value of measured frequencies in an electrical dis-
tribution system
Value of the current flowing in each phase of an
electrical distribution system
Value of neutral current of an electrical distribu-
tion system
Value of neutral current of an electrical distribu-
tion system by calculate
Voltage including Upg (line p to line g voltage) and
Vp (line p to neutral voltage)
Under periodic conditions, ratio of the absolute
value of the active power to the apparent power
G ENER A L
3
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