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