Siemens siprotec 7SA522, User Manual

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Technical Data
10-21
7SA522 Manual
C53000-G1176-C119-2
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 10-2 to 10-2 can be selected
Current Stages High set stages I
Ph
>> (phases) 0.10 A to 25.00 A
1
) (steps 0.01 A)
T
IPh>>
(phases) 0.00 s to 30.00 s (steps 0.01 s)
or
∞
(ineffective)
3I
0
>> (earth) 0.05 A to 25.00 A
1
) (steps 0.01 A)
T
3I0>>
(earth) 0.00 s to 30.00 s (steps 0.01 s)
or
∞
(ineffective)
Overcurrent stages I
Ph
> (phases) 0.10 A to 25.00 A
1
) (steps 0.01 A)
T
IPh>
(phases) 0.00 s to 30.00 s (steps 0.01 s)
or
∞
(ineffective)
3I
0
> (earth) 0.05 A to 25.00 A
1
) (steps 0.01 A)
T
3I0>
(earth) 0.00 s to 30.00 s (steps 0.01 s)
or
∞
(ineffective)
Overcurrent stages I
P
(phases) 0.10 A to 4.00 A
1
) (steps 0.01 A)
(inverse time acc. IEC) pick-up at approx. 1.1·set value
T
IP
(phases) 0.05 s to 3.00 s (steps 0.01 s)
or
∞
(ineffective)
T
IPadd
(phases) 0.00 s to 30.00 s (steps 0.01 s)
3I
0P
(earth) 0.05 A to 4.00 A
1
) (steps 0.01 A)
pick-up at approx. 1.1·set value
T
3I0P
(earth) 0.05 s to 3.00 s (steps 0.01 s)
or
∞
(ineffective)
T
3I0Padd
(earth) 0.00 s to 30.00 s (steps 0.01 s)
Overcurrent stages I
P
(phases) 0.10 A to 4.00 A
1
) (steps 0.01 A)
(inverse time acc. ANSI) pick-up at approx. 1.1·set value
D
IP
(phases) 0.50 s to 15.00 s (steps 0.01 s)
or
∞
(ineffective)
T
IPadd
(phases) 0.00 s to 30.00 s (steps 0.01 s)
3I
0P
(earth) 0.05 A to 4.00 A
1
) (steps 0.01 A)
pick-up at approx. 1.1·set value