Siemens siprotec 7SD5 User Manual

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 3I
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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Siemens siprotec 7SD5 Specifications

General

Brand	Siemens
Model	siprotec 7SD5
Category	Relays
Language	English