Siemens siprotec 7SA522 - Earth Fault Overcurrent Protection Data (optional)

4 Technical Data
450
7SA522 Manual
C53000-G1176-C155-3
4.5 Earth Fault Overcurrent Protection in Earthed Systems
(optional)
Definite Time Very High Set Current Stage
Definite Time High Set Current Stage
Definite time stages 3I
0
>>>, 3I
0
>>, 3I
0
>
Inverse time stage (IDMT) 3I
0p
one of the characteristics according to Figure
4-1 to Figure 4-4 can be selected
Voltage-dependent stage (U
0
-inverse) Characteristics according to Figure 4-4
Zero-sequence power protection Characteristics according to Figure 4-6
Pickup value 3I
0
>>> for I
N
= 1 A 0.05 A to 25.00 A Increments 0.01 A
for I
N
= 5 A 0.25 A to 125.00 A
Delay T
3I0>>>
0.00 s to 30.00 s
or ∞ (ineffective)
Increments 0.01 s
Dropout/pickup ratio Approx. 0.95 for I/I
N
≥ 0.5
Pickup time Approx. 35 ms
Drop-off time Approx. 30 ms
Tolerances Current 3 % of setting value or 1 % nominal current
Time 1 % of setting value or 10 ms
The set times are pure delay times
Pickup value 3I
0
>> for I
N
= 1 A 0.05 A to 25.00 A Increments 0.01 A
for I
N
= 5 A 0.25 A to 125.00 A
Delay T
3I0>>
0.00 s to 30.00 s
or ∞ (ineffective)
Increments 0.01 s
Dropout Ratio Approx. 0.95 for I/I
N
≥ 0.5
Pickup time Approx. 35 ms
Dropout time Approx. 30 ms
Tolerances Current 3 % of setting value or 1 % nominal current
Time 1 % of setting value or 10 ms
The set times are pure delay times