Siemens SIPROTEC User Manual

Technical Data
4.9 Earth Fault Protection in Earthed Systems (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
602
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

Siemens SIPROTEC Specifications

General

Brand	Siemens
Model	SIPROTEC
Category	Protection Device
Language	English