Technical Data
4.9 Earth Fault Protection in Earthed Systems (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
599
Overcurrent stage
Inverse Current Stage (IEC)
Pickup value 3
I
0
>
for
I
N
= 1 A
0.05 A to 25.00 A
or
0.003 A to 25.000 A
Increments 0.01 A
Increments 0.001 A
for
I
N
= 5 A
0.25 A to 125.00 A
or
0.015 A to 125.000 A
Increments 0.01 A
Increments 0.001 A
Delay T
3
I
0>
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 (fast relays/high-speed relays)
(1.5 set value)
(2.5 set value)
Approx. 40 ms/35 ms
Approx. 30ms/25 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 with definite time protection.
Pickup value 3
I
0P
for
I
N
= 1 A
0.05 A to 25.00 A
or
0.003 A to 25.000 A
Increments 0.01 A
Increments 0.001 A
for
I
N
= 5 A
0.25 A to 125.00 A
or
0.015 A to 125.000 A
Increments 0.01 A
Increments 0.001 A
Time factor T
3
I
0P
0.05 s to 3.00 s
or
∞
(ineffective)
Increments 0.01 s
Additional time delay T
3
I
0P add
0.00 s to 30.00 s
or
∞
(ineffective)
Increments 0.01 s
Characteristics
See Figure 4-2
Tolerances
Pickup and dropout thresholds 3
I
0p
3 % of setting value, or 1 % nominal current
Pickup time for 2
≤
I
/3
I
0P
≤
20 and T
3I0P
≥
1 s
5 % of set value
±
15 ms
Defined times
1 % of set value or 10 ms
