Communication-capable Circuit Breakers
2/16
Table 2-7
The metering function provides a minimum and maximum measured value for each measured value specified above. If the metering
function is retrofitted by the customer, the accuracy of the values specified cannot be ensured, since it will not have been calibrated with the trip unit.
Measurement conditions:
Frequency
f = 60 Hz
Power factor
cos
= 1
Waveform
Total harmonic distortion≤ 5%; symmetrical load
Ambient temperature
35°C ± 5°C
Power supply
UL Listed 24V DC class 2
Warm-up period
2 hours
Relative air humidity
Up to 90%
Metering range:
Current
0.2 ... 1.2 I
nmax
Voltage
0.8 ... 1.2 V
nmax
1. Accuracy is specified as follows: ± (x%) from the upper limit of effective range + 2 LSD (Least Significant Digit))
as shipped from the factory
WL Circuit Breaker
The metering function provides the following measured values for communication system:
Measured value
Value range
Accuracy (with direct order: circuit b
trip unit + met. function or met. function Plus)
1
Currents I
a
, I
b
, I
c
, I
N
30 ... 8000A
± 1%
Ground-fault current I
g
(measure with external G transformer)
100 ... 1200A
± 5%
Line-to-line voltages V
ab
, V
bc
, V
ca
80 ... 120% V
n
± 1%
Line-to-neutral voltages V
an
, V
bn
, V
cn
80 ... 120% V
n
± 1%
Average value of phase-to-phase voltages V
LLAVG
80 ... 120% V
n
± 1%
Apparent power kVA per phase
13 ... 8000kVA
± 2%
Total apparent power KVA
13 ... 24000kVA
± 2%
Active power kW per phase
-8000 ... 8000kW
± 3% (power factor > 0.6)
Total active power kW
total
-24000 ... 24000kVA
± 3% (power factor > 0.6)
Reactive power kvar
-6400 ... 6400kvar
± 4% (power factor > 0.6)
Total reactive power kvar
-20000 ... 20000kvar
± 4% (power factor > 0.6)
Power factor per phase
-0.6 ... 1 ... 0.6
± 0.04
Power factor total
-0.6 ... 1 ... 0.6
± 0.04
Demand of currents I
a
, I
b
, I
c
30 ... 8000A
± 1%
Average demand of 3-phase current
30 ... 8000A
± 1%
Demand kWD per phase
13 ... 8000kW
± 3% (power factor > 0.6)
kW demand 3-phase active power kWD total
13 ... 8000kW
± 3% (power factor > 0.6)
kVA demand kVA total
13 ... 8000kVA
± 2%
kVAR demand kVAR per phase
13 ... 8000kVA
± 2%
kVAR demand total
-24000 ... 24000kvar
± 4% (power factor > 0.6)
kWhr imported1 ... 10000MWh
± 2%
kWhr exported1 ... 10000MWh
± 2%
kVARh imported1 ... 10000Mvarh
± 4%
kVARh exported1 ... 10000Mvarh
± 4%
Frequency
15 ... 440 Hz
± 0.1 Hz
Total harmonic distortions for current and voltage
2 ... 100%
± 3% from the meas. range up to the 29th harmonic
Phase unbalance for current and voltage
2 ... 150%
± 1%
WL PROFIBUS Communication and Electronic Accessories • July 2004
