Earth Fault Protection In Earthed Systems (Optional) - Siemens siprotec 7SD5 User Manual

4.8

Earth Fault Protection in Earthed Systems (optional)

Characteristics
Definite Time Stages
Inverse time stage (IDMT)
Voltage-dependent stage (U
Zero-sequence power protection
Very High Set Stage
High current pickup 3I >>>
0
Delay T
3I0>>>
Dropout/pickup ratio
Pickup time (fast relays/high-speed relays)
Dropout time
Tolerances
The set times are pure delay times
High Set Stage
Pickup value 3I >>
0
Delay T
3I0>>
Dropout Ratio
Pickup time (fast relays/high-speed relays)
Dropout time
Tolerances
The set times are pure delay times
Definite Time Overcurrent Stage
Pickup value 3I >
0
Delay T
3I0>
Dropout Ratio
7SD5 Manual
C53000-G1176-C169-1
3I
3I
one of the characteristics according to Figure
4-1 to Figure 4-4 can be selected
inverse) Characteristics according to Figure
0
4-5
Characteristics according to Figure 4-6
for I = 1 A 0.05 A to 25.00 A
N
for I = 5 A 0.25 A to 125.00 A
N
0.00 s to 30.00 s
or ∞ (ineffective)
Approx. 0.95 for I/I
approx. 30/25 ms
Approx. 30 ms
Current 3 % of setting value or 1 % nominal current
Time 1 % of setting value or 10 ms
for I = 1 A 0.05 A to 25.00 A
N
for I = 5 A 0.25 A to 125.00 A
N
0.00 s to 30.00 s
or ∞ (ineffective)
Approx. 0.95 for I/I
approx. 30/25 ms
Approx. 30 ms
Current 3 % of setting value or 1 % nominal current
Time 1 % of setting value or 10 ms
for I = 1 A 0.05 A to 25.00 A
N
or
0.003 A to 25.000 A
for I = 5 A 0.25 A to 125.00 A
N
or
0.015 A to 125.000 A
0.00 s to 30.00 s
or ∞ (ineffective)
Approx. 0.95 for I/I
4.8 Earth Fault Protection in Earthed Systems (optional)
>>>, 3I >>, 3I >
0 0 0
0P
≥ 0.5
N
≥ 0.5
N
≥ 0.5
N
Increments 0.01 A
Increments 0.01 s
Increments 0.01 A
Increments 0.01 s
Increments 0.01 A
Increments 0.001 A
Increments 0.01 A
Increments 0.001 A
Increments 0.01 s
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