84
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
values of a quantity during a specified interval.
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.
UMTS
Universal Mobile Telecommunications System (3G).
Ux-Hn
Phase-to-phase voltage (value or percentage) for harmonic order n.
Uxy-THD
Total phase-to-phase voltage harmonic distortion
V
Abbreviation for phase-to-neutral voltage or the unit “volt”.
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
component) and/or the phase differences between successive conductors are not equal.
Vx-Hn
Phase-to-neutral voltage (value or percentage) for harmonic order n.
W
Active power unit (Watt).
Wh
Active energy unit (Watt-hour).
Prefixes of International System (SI) units
Prefix
Symbol
Multiplies by
milli
m
10
-3
kilo
k
10
3
Mega
M
10
6
Giga
G
10
9
Tera
T
10
12
Peta
P
10
15
Exa
E
10
18
Table 29
Summary of Contents for pel 102
Page 1: ...Power energy logger EN User s manual PEL 102 PEL 103 PEL 104 ...
Page 24: ...24 Aggregation period Date and time IP address scrolling Wi Fi address scrolling PEL104 ...
Page 36: ...36 Three phase 3 wire balanced 3P 3W b U12 U23 U31 f P Q S PF P Q S tan ϕ I1 I2 I3 ϕ I1 U12 ...
Page 38: ...38 Three phase 4 wire wye balanced 3P 4WYb I1 I2 I3 V1 V2 V3 VN U12 U23 U31 f P Q S tan ϕ ...
Page 39: ...39 DC 2 wire dC 2W DC 3 wire dC 3W P Q S PF ϕ I1 V1 P Q S tan ϕ P I V VN I1 I2 IN ...
Page 40: ...40 DC 4 wire dC 4W P I1 I2 I3 IN V1 V2 V3 VN V1 V2 VN ...
Page 48: ...48 Two phase 3 wire 1P 3W I1 I2 V1 V2 U12 VN P Q S P Q S ...
Page 51: ...51 P Q S ...
Page 85: ...85 ...