Earth Fault Protection In Earthed Systems - Siemens siprotec 7SA6 User Manual

Technical Data
10.5

Earth Fault Protection in Earthed Systems

Characteristics
High Set Stage
High Set Stage
High Set Stage
10-16
Definite time stages
Inverse time stage
Voltage-dependent stage (U
Pickup value
Drop-off to pick-up ratio
Pickup time
Drop-off time
Tolerances
The set times are pure delay times.
1) Secondary values based on I
Pickup value
Delay time
Drop-off to pick-up ratio
Pickup time
Drop-off time
Tolerances
The set times are pure delay times.
1) Secondary values based on I
Pickup value
Delay time
Drop-off to pick-up ratio
Pickup time
Drop-off time
Tolerances
The set times are pure delay times.
1) Secondary values based on I
(definite) 3I >>>,3I
0
(IDMT) 3I
0P
one of the characteristics according to
Figure 10-1 to 10-11 can be selected
inverse) characteristic according to 10-8
0
3I >>> 0.50 A to 25.00 A
0
T 0.00 s to 30.00 s
3I0>>>
or ∞ (ineffective)
approx. 0.95 for I/I
approx. 35 ms
approx. 30 ms
current 3 % of set value or 1% nominal current
time 1 % of set value or 10 ms
= 1 A; for I = 5 A the current values must be multiplied by 5.
N N
3I >>0.20 A to 25.00 A
0
T 0.00 s to 30.00 s
3I0>>
or ∞ (ineffective)
approx. 0.95 for I/I
approx. 35 ms
approx. 30 ms
current 3 % of set value or 1% of nominal current
time 1 % of set value or 10 ms
= 1 A; for I = 5 A the current values must be multiplied by 5.
N N
3I > 0.05 A to 25.00 A
0
or 0.003 A to 25.000 A
T 0.00 s to 30.00 s
3I0>
or ∞ (ineffective)
approx. 0.95 for I/I
approx. 35 ms
approx. 30 ms
current 3 % of set value or 1% of nominal current
time 1 % of set value or 10 ms
= 1 A; for I = 5 A the current values must be multiplied by 5.
N N
>>,3I >
0 0
1
) (steps 0.01 A)
(steps 0.01 s)
≥ 0.5
N
1
) (steps 0.01 A)
(steps 0.01 s)
≥ 0.5
N
1
) (steps 0.01 A)
1
) (steps 0.001 A
(steps 0.01 s)
≥ 0.5
N
7SA6 Manual
C53000-G1176-C133-1
1
)