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
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