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The metering function provides the following measured values for communication system:
Measured value
Currents I
, I
, I
, I
a
b
c
N
Ground-fault current I
(measure with external G transformer)
g
Line-to-line voltages V
, V
, V
ab
bc
ca
Line-to-neutral voltages V
, V
, V
an
bn
Average value of phase-to-phase voltages V
Apparent power kVA per phase
Total apparent power KVA
Active power kW per phase
Total active power kW
total
Reactive power kvar
Total reactive power kvar
Power factor per phase
Power factor total
Demand of currents I
, I
, I
a
b
c
Average demand of 3-phase current
Demand kWD per phase
kW demand 3-phase active power kWD total
kVA demand kVA total
kVAR demand kVAR per phase
kVAR demand total
kWhr imported
kWhr exported
kVARh imported
kVARh exported
Frequency
Total harmonic distortions for current and voltage
Phase unbalance for current and voltage
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.
1. Accuracy is specified as follows: ± (x%) from the upper limit of effective range + 2 LSD (Least Significant Digit))
as shipped from the factory
Measurement conditions:
Frequency
f = 60 Hz
Power factor
cos
Waveform
Total harmonic distortion≤ 5%; symmetrical load
Ambient temperature
35°C ± 5°C
Metering range:
Current
0.2 ... 1.2 I
Voltage
0.8 ... 1.2 V
WL PROFIBUS Communication and Electronic Accessories • July 2004
Communication-capable Circuit Breakers
Value range
30 ... 8000A
100 ... 1200A
80 ... 120% V
80 ... 120% V
cn
80 ... 120% V
LLAVG
13 ... 8000kVA
13 ... 24000kVA
-8000 ... 8000kW
-24000 ... 24000kVA
-6400 ... 6400kvar
-20000 ... 20000kvar
-0.6 ... 1 ... 0.6
-0.6 ... 1 ... 0.6
30 ... 8000A
30 ... 8000A
13 ... 8000kW
13 ... 8000kW
13 ... 8000kVA
13 ... 8000kVA
-24000 ... 24000kvar
1 ... 10000MWh
1 ... 10000MWh
1 ... 10000Mvarh
1 ... 10000Mvarh
15 ... 440 Hz
2 ... 100%
2 ... 150%
= 1
nmax
nmax
WL Circuit Breaker
Accuracy (with direct order: circuit breaker +
trip unit + met. function or met. function Plus)
± 1%
± 5%
± 1%
n
± 1%
n
± 1%
n
± 2%
± 2%
± 3% (power factor > 0.6)
± 3% (power factor > 0.6)
± 4% (power factor > 0.6)
± 4% (power factor > 0.6)
± 0.04
± 0.04
± 1%
± 1%
± 3% (power factor > 0.6)
± 3% (power factor > 0.6)
± 2%
± 2%
± 4% (power factor > 0.6)
± 2%
± 2%
± 4%
± 4%
± 0.1 Hz
± 3% from the meas. range up to the 29th harmonic
± 1%
Power supply
UL Listed 24V DC class 2
Warm-up period
2 hours
Relative air humidity
Up to 90%
1
2/16
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