Accuracy; Used Calculation Formulas - CARLO GAVAZZI WM5-96 - PROGRAMMING Instruction Manual

WM5-96 Instruction Manual

Accuracy

PF=1 Error
+1.0%
+0.5%
-0.5%
-1.0%
PF=1 0.05A 0.25A
(0.01In) (0.05In)
PF=L0.5 0.1A 0.5A
or C0.8 (0.02In) (0.1In)
sinϕ=1
Error
+2.5%
+2%
-2%
-2.5%
sinϕ=1 0.1A 0.25A
(0.02In) (0.05In)
sinϕ=0.5 0.25A 0.5A
(0.05In) (0.1In)

Used calculation formulas

Phase variables
Instantaneous effective voltage
Instantaneous active power
Instantaneous power factor
Instantaneous effective current
Instantaneous apparent power
Instantaneous reactive power
Technical Specifications
PF=L0.5
or C0.8
+1%
Class 0.5
-1%
5A (In) 10A (Imax)
5A (In) 10A (Imax)
Class 2
5A (In) 10A (Imax)
5A (In) 10A (Imax)
System variables
Equivalent three-phase voltage
Voltage asymmetry
( V -
A S Y L L m a x
=
L L
V
L L
( V
-
ASY
= LN max
LN
V
LN
Three-phase reactive power
Neutral current
An = A +A +A
L1 L2
Three-phase active power
Three-phase apparent power
kWh, accuracy (RDG) depending on the current
Class 0.5 accuracy limits (active energy) EN62053-21
5(10A) start-up current: 5mA.
kvarh, accuracy (RDG) depending on the current
Class 2 accuracy limits (reactive energy) EN62053-23
5(10A) start-up current: 5mA.
V )
L L m in
å
V )
LN min
å
L3
Three-phase power factor
(TPF)
Energy metering
Where:
i= considered phase (L1, L2 or L3)
P= active power; Q= reactive power;
t , t =starting and ending time points
1 2
of consumption recording; n= time
unit;∆t= time interval between two
successive power measurements;
n , n = starting and ending discrete
1 2
time points of power recording
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