Siemens siprotec 7SA6 User Manual

Technical Data
10-257SA6 Manual
C53000-G1176-C133-1
10.9 Overcurrent Protection
Operating Modes As emergency overcurrent protection or back-up overcurrent protection:
Emergency overcurrent protection operates on failure of the measured
voltage,
– on trip of a voltage secondary miniature
circuit breaker (via binary input)
– on detection of a fuse failure in the
voltage secondary circuit
Back-up overcurrent protection operates independent on any events
Characteristics Definite time stages (definite) I
Ph
>>,3I
0
>>, I
Ph
>, 3I
0
>
Inverse time stage (IDMT) I
P
, 3I
0P
one of the characteristics according to
Figure 10-1 to 10-3 (see Section 10.5)
can be selected
High Set Stages Pickup values I
Ph
>> (phases) 0.10 A to 25.00 A
1
) (steps 0.01 A)
or ∞ (ineffective)
3I
0
>> (earth) 0.05 A to 25.00 A
1
) (steps 0.01 A)
or ∞ (ineffective)
Time delays T
IPh>
(phases) 0.00 s to 30.00 s (steps 0.01 s)
or ∞ (ineffective)
T
3I0>>
(earth) 0.00 s to 30.00 s (steps 0.01 s)
or ∞ (ineffective)
Drop-off to pick-up ratio approx. 0.95 for I/I
N
≥ 0.5
Pick-up time approx. 25 ms
Drop-off time approx. 30 ms
Tolerances currents 3 % of set value or 1% nominal current
times 1 % of set value or 10 ms
The set times are pure delay times.
1
) Secondary values based on I
N
= 1 A; for I
N
= 5 A they must be multiplied by 5.

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English