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4 Technical Data
4.11
Time Overcurrent Protection
Operating Modes
As Emergency Overcurrent Protection or Back-up Overcurrent Protection:
Emergency overcurrent protection
Back-up overcurrent protection
Characteristics
Definite dime stages (definite)
Inverse time stages (IDMT)
Definite Time High Set Current Stage
Pickup value I
>> (phases)
Ph
Pickup value 3I
>> (earth)
0
Delay T
>> (phases)
Ph
Delay T
>> (earth)
3I0
Dropout Ratio
Pickup times
Drop-off times
Tolerances
The set times are pure delay times
464
Operates on failure of the measured voltage,
• On trip of a voltage transformer mcb (via binary input)
• For pickup of the "Fuse Failure Monitor"
Operates independent of any events
I
>>,3I
>>, I
Ph
0
I
, 3I
; one of the characteristics according to
P
0p PICKUP
Figure 4-1 to 4-3 (see Section 4.5)
can be selected
For I
= 1 A 0.10 A to 25.00 A
N
or ∞ (ineffective)
For I
= 5 A 0.50 A to 125.00 A
N
or ∞ (ineffective)
For I
= 1 A 0.05 A to 25.00 A
N
Or ∞ (ineffective)
For I
= 5 A 0.25 A to 125.00 A
N
Or ∞ (ineffective)
0.00 s to 30.00 s
Or ∞ (ineffective)
0.00 s to 30.00 s
Or ∞ (ineffective)
Approx. 0.95 for I/I
Approx. 25 ms
Approx. 30 ms
Currents
3 % of setting value or 1 % nominal current
Times
1 % of setting value or 10 ms
>, 3I
>
Ph
0
Increments 0.01 A
Increments 0.01 A
Increments 0.01 s
Increments 0.01 s
≥ 0.5
N
7SA522 Manual
C53000-G1176-C155-3
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