4 Technical Data
544
7SD5 Manual
C53000-G1176-C169-1
Determination of Direction
Each zone can be set to operate in forward or reverse direction, non-directional or ineffective.
Direction measurement
With
I
E
(= 3
I
0
) and 3 U
0
and
I
Y
or
I
2
and U
2
with
I
E
(= 3
I
0
) and 3 U
0
and
I
Y
With
I
E
(= 3
I
0
) and
I
Y
(starpoint current of a power transformer)
With
I
2
and U
2
(negative sequence quantities)
With zero-sequence power
Limit values
Displacement voltage 3U
0
>
0.5 V to 10.0 V
Increments 0.1 V
Starpoint current of a power transformer
I
Y
>
for
I
N
= 1 A 0.05 A to 1.00 A
Increments 0.01 A
for
I
N
= 5 A 0.25 A to 5.00 A
Negative sequence current 3
I
2
>
for
I
N
= 1 A 0.05 A to 1.00 A
Increments 0.01 A
for
I
N
= 5 A 0.25 A to 5.00 A
Negative sequence voltage 3U
2
>
0.5 V to 10.0 V
Increments 0.1 V
"Forward" angle
Capacitive alpha
0
°
to 360
°
Increments 1
°
Inductive beta
0
°
to 360
°
Increments 1
°
Tolerances pickup values
10 % of set value or 5 % of nominal current or 0.5 V
Tolerance forward angle
5
°
Re-orientation time after direction change
Approx. 30 ms
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