Siemens SIPROTEC User Manual

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 3I
0
>>>, 3I
0
>>, 3I
0
>
Inverse time stage (IDMT) 3I
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 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 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 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 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.

Siemens SIPROTEC Specifications

General

Brand	Siemens
Model	SIPROTEC
Category	Protection Device
Language	English