Siemens siprotec 7SA6 User Manual page 646

Technical Data
Inrush Stabilization
Direction
Determination
10-18
Tolerances
Drop-off to pick-up ratio current
The set times are pure delay times.
1) Secondary values based on I
Second harmonic content for inrush
blocking
Inrush blocking is cancelled above
Inrush stabilization may be switched effective or ineffective for each individual stage.
1
) Secondary values based on I
Direction determination
Limit values
Displacement voltage
Starpoint current of a power
transformer I >
Y
Negative sequence current 3I
Negative sequence voltage 3U
"Forward" angle
capacitive
inductive
Tolerances pick-up values
"Forward" angle
Re-orientation time after direction change approx. 30 ms
1
) Secondary values based on I
characteristics see Figure 10-5
times 1 % of set value or 10 ms
approx. 0.95 for I/I
voltage approx. 0.95 for 3U
= 1 A; for I = 5 A the current values must be multiplied by 5.
N N
10 % to 45 %
referred to fundamental wave
0.50 A to 25.00 A
= 1 A; for I = 5 A they must be multiplied with 5.
N N
with I
E
with I
E
and I
Y
with 3I
2
(negative sequence quantities)
3U > 0.5 V to 10.0 V
0
0.05 A to 1.00 A
> 0.05 A to 1.00 A
2
> 0.5 V to 10.0 V
2
Alpha 0° to 360°
Beta 0° to 360°
10 % of set value
or 5% of nominal current or 0.5 V
5°
= 1 A; for I = 5 A they must be multiplied by 5.
N N
≥ 0.5
N
≥ 1 V
0
(steps 1 %)
1
) (steps 0.01 A
(= 3I ) and 3U
0 0
(= 3I )
0
(transformer star-point current)
and 3U
2
(steps 0.1 V)
1
) (steps 0.01 A)
1
) (steps 0.01 A)
(steps 0.1 V)
(steps 1°)
(steps 1°)
C53000-G1176-C133-1
1
)
7SA6 Manual