Siemens siprotec 7SD5 User Manual

4.8 Earth Fault Protection in Earthed Systems (optional)
541
7SD5 Manual
C53000-G1176-C169-1
4.8 Earth Fault Protection in Earthed Systems (optional)
Characteristics
Very High Set Stage
High Set Stage
Definite Time Overcurrent 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
4-5
Zero-sequence power protection Characteristics according to Figure 4-6
High current pickup 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 (fast relays/high-speed relays) approx. 30/25 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
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 (fast relays/high-speed relays) approx. 30/25 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
Pickup value 3I
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
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
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Siemens siprotec 7SD5 Specifications

General

Brand	Siemens
Model	siprotec 7SD5
Category	Relays
Language	English