3WL air circuit breakers
3.3 Metering functions
3WL/3VL circuit breakers with communication capability - PROFIBUS
52
System Manual, 03/2011, A5E01051353-02
Table 3- 8
Reference conditions:
Input current
I
nmax
± 1%
Input voltage
V
n
± 1%
Frequency
f = 50 Hz
Power factor
cos φ = 1
Waveform
Sine, THD ≤ 5%; symmetrical load
Ambient temperature
35 °C ± 5 °C
Auxiliary voltage
24 V DC in accordance with DIN 19240/EN 61131
Warm-up time
2 hours
Relative humidity
Up to 90%
Interfering fields
None
Current
0.2 … 1.2 I
nmax
Measuring range:
Voltage
0.8 … 2 V
nmax
Extended protection function
Additional tripping criteria can be set via the protection function of the metering function
PLUS. A parameterized delay time can achieve "debouncing" of briefly occurring events.
With this, the switch only trips if the set event persists longer than the delay time.
The extended protection function of the metering function PLUS can monitor the following
criteria and trigger the trip unit when limits are exceeded:
Table 3- 9
Protection function of the metering function PLUS
Parameters
Setting range
Possible delay
Phase unbalance current
5 … 50 %
0 … 15 s
THD current
5 … 50 %
5 … 15 s
Phase unbalance voltage
5 … 50 %
0 … 15 s
Undervoltage
100 … 1100 V
0 … 15 s
Overvoltage
200 … 1200 V
0 … 15 s
THD voltage
3 … 50 %
5 … 15 s
Direction of rotation of phase
–
–
Active power in normal direction
1 … 12000 kW
0 … 15 s
Active power in reverse direction
1 … 12000 kW
0 … 15 s
Underfrequency
40 … 70 Hz
0 … 15 s
Overfrequency
40 … 70 Hz
0 … 15 s