Siemens siprotec 7SA522 - Page 531

Technical Data
10-157SA522 Manual
C53000-G1176-C119-2
Direction
Determination
Direction determination with I
E
(= 3I
0
) and 3U
0
with I
E
(= 3I
0
) and I
Y
(transformer star-point
current)
with 3I
2
and 3U
2
(negative sequence quantities)
Limit values
Displacement voltage 3U
0
> 0.5 V to 10.0 V (steps 0.1 V)
Starpoint current of a power
transformer I
Y
> 0.05 A to 1.00 A
1
) (steps 0.01 A)
Negative sequence current 3I
2
> 0.05 A to 1.00 A
1
) (steps 0.01 A)
Negative sequence voltage 3U
2
> 0.5 V to 10.0 V (steps 0.1 V)
“Forwards” angle
capacitive Alpha 0° to 360° (steps 1°)
inductive Beta 0° to 360° (steps 1°)
Tolerances pick-up values 10 % of set value
or 5% of nominal current or 0.5 V
“Forwards” angle 5°
Re-orientation time after direction change approx. 30 ms
1
) Secondary values based on I
N
= 1 A; for I
N
= 5 A they must be multiplied with 5.