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Overcurrent stage
Pickup value 3I
>
0
Delay T
3I0>
Dropout ratio
Pickup time (fast relays/high-speed relays)
(1.5 set value)
(2.5 set value)
Dropout time
Tolerances
The set times are pure delay times with definite time protection.
Inverse Current Stage (IEC)
Pickup value 3I
0P
Time factor T
3I0P
Additional time delay T
3I0P add
Characteristics
Tolerances
Pickup and dropout thresholds 3I
Pickup time for 2 ≤ I/3I
0P
Defined times
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
for I
= 1 A
N
for I
= 5 A
N
Current
Time
for I
= 1 A
N
for I
= 5 A
N
0p
≤ 20 and T
≥ 1 s
3I0P
4.9 Earth Fault Protection in Earthed Systems (optional)
0.05 A to 25.00 A
or
0.003 A to 25.000 A
0.25 A to 125.00 A
or
0.015 A to 125.000 A
0.00 s to 30.00 s
or ∞ (ineffective)
Approx. 0.95 for I/I
≥ 0.5
N
Approx. 40 ms/35 ms
Approx. 30ms/25 ms
Approx. 30 ms
3 % of setting value or 1 % nominal current
1 % of setting value or 10 ms
0.05 A to 25.00 A
or
0.003 A to 25.000 A
0.25 A to 125.00 A
or
0.015 A to 125.000 A
0.05 s to 3.00 s
or ∞ (ineffective)
0.00 s to 30.00 s
or ∞ (ineffective)
See Figure 4-2
3 % of setting value, or 1 % nominal current
5 % of set value ± 15 ms
1 % of set value or 10 ms
Technical Data
Increments 0.01 A
Increments 0.001 A
Increments 0.01 A
Increments 0.001 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
Increments 0.01 s
599
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