Technical Data
4.9 Earth Fault Protection in Earthed Systems (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
598
4.9
Earth Fault Protection in Earthed Systems (optional)
Characteristics
Very high set current stage
High-current Stage
Definite time stages
3
I
0
>>>, 3
I
0
>>, 3
I
0
>
Inverse time stage (IDMT)
3
I
0P
one of the characteristics according to Figure
4-2 to Figure 4-5 can be selected
Voltage-dependent stage (U
0
inverse)
Characteristics according to Figure 4-6
Zero-sequence power protection
Characteristics according to Figure 4-7
High current pickup 3
I
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
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)
Approx. 30 ms/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
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
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)
Approx. 30 ms/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.
