Siemens siprotec 7SA6 - Earth Fault Protection in Earthed Systems

Technical Data
10-16 7SA6 Manual
C53000-G1176-C133-1
10.5 Earth Fault Protection in Earthed Systems
Characteristics Definite time stages (definite) 3I
0
>>>,3I
0
>>,3I
0
>
Inverse time stage (IDMT) 3I
0P
one of the characteristics according to
Figure 10-1 to 10-11 can be selected
Voltage-dependent stage (U
0
inverse) characteristic according to 10-8
High Set Stage Pickup value 3I
0
>>> 0.50 A to 25.00 A
1
) (steps 0.01 A)
T
3I0>>>
0.00 s to 30.00 s (steps 0.01 s)
or ∞ (ineffective)
Drop-off to pick-up 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 set value or 1% nominal current
time 1 % of set value or 10 ms
The set times are pure delay times.
1) Secondary values based on I
N
= 1 A; for I
N
= 5 A the current values must be multiplied by 5.
High Set Stage Pickup value 3I
0
>>0.20 A to 25.00 A
1
) (steps 0.01 A)
Delay time T
3I0>>
0.00 s to 30.00 s (steps 0.01 s)
or ∞ (ineffective)
Drop-off to pick-up 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 set value or 1% of nominal current
time 1 % of set value or 10 ms
The set times are pure delay times.
1) Secondary values based on I
N
= 1 A; for I
N
= 5 A the current values must be multiplied by 5.
High Set Stage Pickup value 3I
0
> 0.05 A to 25.00 A
1
) (steps 0.01 A)
or 0.003 A to 25.000 A
1
) (steps 0.001 A
1
)
Delay time T
3I0>
0.00 s to 30.00 s (steps 0.01 s)
or ∞ (ineffective)
Drop-off to pick-up 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 set value or 1% of nominal current
time 1 % of set value or 10 ms
The set times are pure delay times.
1) Secondary values based on I
N
= 1 A; for I
N
= 5 A the current values must be multiplied by 5.