Siemens siprotec 7SA522 User Manual

4.5 Earth Fault Overcurrent Protection in Earthed Systems (optional)
453
7SA522 Manual
C53000-G1176-C155-3
Zero Sequence Power Protection Stage
Inrush Stabilization
Determination of Direction
Pickup value 3I
0P
for I
N
= 1 A 0.05 A to 25.00 A
0.003 A to 25.000 A
Increments 0.01 A
Increments 0.001 A
for I
N
= 5 A 0.25 A to 125.00 A
0.015 A to 125.000 A
Increments 0.01 A
Increments 0.001 A
Pickup value S FORWARD 0.1 VA to 10.0 VA Increments 0.1 VA
Additional delay T3I
OPverz
0.00 s to 30.00 s Increments 0.01 s
Characteristics See Figure 4-6
Tolerances pick-up values 1 % of set value at sensitive earth current transformer
Tolerances times 5 % of set value or 15 ms at sensitive earth current transformer
6 % of set value or 15 ms at normal earth current
transformer / without earth current transformer
Second harmonic content for inrush 10 % to 45 % Increments 1 %
Referred to fundamental wave
Inrush blocking is cancelled above for I
N
= 1 A 0.50 A to 25.00 A Increments 0.01 A
for I
N
= 5 A 2.50 A to 125.00 A
Inrush stabilization may be switched effective or ineffective for each individual stage.
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
odr 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
0
(transformer star-point current)
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 0.1V
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 0.1V
"Forward" angle
Capacitive alpha 0° to 360° Increments 1°
Inductive beta 0° to 360° Increments 1°
Tolerances pick-up 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 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English