Siemens siprotec 7SA522 User Manual page 531

Direction
Determination
7SA522 Manual
C53000-G1176-C119-2
Direction determination
Limit values
Displacement voltage
Starpoint current of a power
transformer I >
Y
Negative sequence current 3I
Negative sequence voltage 3U
"Forwards" angle
capacitive
inductive
Tolerances pick-up values
"Forwards" angle
Re-orientation time after direction change approx. 30 ms
1
) Secondary values based on I
with I
E
with I (= 3I
E
current)
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 with 5.
N N
Technical Data
(= 3I ) and 3U
0 0
) and I (transformer star-point
0 Y
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°)
10-15