Carlo Gavazzi WM5-96 - Manual (Page 51)

49
WM5-96 Instruction Manual
Used calculation formulas
Accuracy
kWh, accuracy (RDG) depending on the current
Error
10A (Imax)
10A (Imax)
5A (In)
5A (In)
0.25A
(0.05In)
0.5A
(0.1In) 0.05A
(0.01In)
0.1A
(0.02In)
+1.0%
Class 0.5 accuracy limits (active energy) EN62053-21
5(10A) start-up current: 5mA.
kvarh, accuracy (RDG) depending on the current
Error
Class 2 accuracy limits (reactive energy) EN62053-23
5(10A) start-up current: 5mA.
PF=1
PF=L0.5
or C0.8
10A (Imax)
10A (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
+0.5%
PF=1 PF=L0.5
or C0.8
+2.5%
+2%
-1.0%
-0.5%
-2.5%
-2%
Class 0.5
Class 2
+1%
-1%
sin ϕ=1
Technical Specifications
System variables
Equivalent three-phase voltage
Voltage asymmetry
Three-phase reactive power
Neutral current
Three-phase active power
Three-phase apparent power
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;
t
1
, t
2
=starting and ending time points
of consumption recording; n= time
unit;
∆t= time interval between two
successive power measurements;
n
1
, n
2
= starting and ending discrete
time points of power recording
An = A
L1
+A
L2
+A
L3
å
-
=
L L
L L L L
L L V
V V
A S Y
) (
m in m ax
Three-phase power factor
(TPF)
å
-
=
LN
LN LN
LN V
V V
ASY
) (
min max