System variables
Equivalent three-phase voltage
Voltage asymmetry
Three-phase reactive power
Neutral current
Three-phase active power
Three-phase apparent power
8
Specifications are subject to change without notice
CPT-DINADS110706
CPT-DIN
Used calculation formulas
Waveform of the signals that can be measured
Figure A
Sine wave, undistorted
Fundamental content
100%
Harmonic content
0%
Arms =
1.1107 | A |
Figure B
Sine wave, indented
Fundamental content
10...100%
Harmonic content
0...90%
Frequency spectrum: 3rd to 16th harmonic
Additional error: <1% FS
Figure C
Sine wave, distorted
Fundamental content
70...90%
Harmonic content
10...30%
Frequency spectrum: 3rd to 16th harmonic
Additional error: <0.5% FS
Accuracy
kWh, accuracy (RDG) depending on the current
Error
6A (Imax)
6A (Imax)
5A (In)
5A (In)
0.25A
(0.05In)
0.5A
(0.1In)
0.10A
(0.02In)
0.25A
(0.05In)
0%
+2.5%
Class 2 accuracy limits (Active energy) EN62053-21
5(6A) Start-up current: 10mA
kvarh, accuracy (RDG) depending on the current
Error
0%
+4%
Class 3 accuracy limits (Reactive energy) EN62053-23
5(6A) Start-up current: 10mA
PF=1
PF=L0.5
or C0.8
6A (Imax)
6A (Imax)
5A (In)
5A (In)
0.25A
(0.05In)
0.5A
(0.1In)
0.1A
(0.02In)
0.25A
(0.05In)
sin
ϕ=1
sin
ϕ=0.5
Phase variables
Instantaneous effective voltage
Instantaneous active power
Instantaneous power factor
Instantaneous effective current
Instantaneous apparent power
Instantaneous reactive power
Energy metering
Where:
i= considered phase (L1, L2 or L3)
P= active power; Q= reactive power;
t1, t2 =starting and ending time points
of consumption recording; n= time
unit;
∆t= time interval between two
successive power consumptions;
n1, n2 = starting and ending discrete
time points of consumption recording
An = AL1+AL2+AL3
+2%
+1.5%
+1%
+1.5%
-1.5%
PF=1
PF=L0.5
or C0.8
+2.5%
+2%
+3%
+2.5%
+2%
+1.5%
+1%
+ 1%
- 1%
+4%
+3%
+2.5%
+2%
∑
−
=
LL
LL
L L
LL
V
V
V
AS Y
)
(
min
m ax
Three-phase power factor
(TPF)
∑
−
=
LN
LN
LN
LN
V
V
V
ASY
)
(
min
max
Class 2
Class 1 (typ)
Class 2 (typ)
Class 2
Class 3
Class 3
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