Siemens SENTRON VL Series System Manual page 52

3WL air circuit breakers
3.3 Metering functions
Table 3- 8 Reference conditions:
Input current
Input voltage
Frequency
Power factor
Waveform
Ambient temperature
Auxiliary voltage
Warm-up time
Relative humidity
Interfering fields
Measuring range:
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
Phase unbalance current
THD current
Phase unbalance voltage
Undervoltage
Overvoltage
THD voltage
Direction of rotation of phase
Active power in normal direction
Active power in reverse direction
Underfrequency
Overfrequency
52
Current
Voltage
Setting range
5 ... 50 %
5 ... 50 %
5 ... 50 %
100 ... 1100 V
200 ... 1200 V
3 ... 50 %
–
1 ... 12000 kW
1 ... 12000 kW
40 ... 70 Hz
40 ... 70 Hz
I ± 1%
nmax
V ± 1%
n
f = 50 Hz
cos φ = 1
Sine, THD ≤ 5%; symmetrical load
35 °C ± 5 °C
24 V DC in accordance with DIN 19240/EN 61131
2 hours
Up to 90%
None
0.2 ... 1.2 I
nmax
0.8 ... 2 V
nmax
Possible delay
0 ... 15 s
5 ... 15 s
0 ... 15 s
0 ... 15 s
0 ... 15 s
5 ... 15 s
–
0 ... 15 s
0 ... 15 s
0 ... 15 s
0 ... 15 s
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02