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Zero Sequence Power Protection Stage
Pickup value 3I
0P
Pickup value S FORWARD
Additional delay T3I
OPverz
Characteristics
Tolerances pick-up values
Tolerances times
Inrush Stabilization
Second harmonic content for inrush
Inrush blocking is cancelled above
Inrush stabilization may be switched effective or ineffective for each individual stage.
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
Starpoint current of a power transformer
I
>
Y
Negative sequence current 3I
Negative sequence voltage 3U
"Forward" angle
Capacitive alpha
Inductive beta
Tolerances pick-up values
Tolerance forward angle
Re-orientation time after direction change
7SA522 Manual
C53000-G1176-C155-3
4.5 Earth Fault Overcurrent Protection in Earthed Systems (optional)
for I
= 1 A 0.05 A to 25.00 A
N
for I
= 5 A 0.25 A to 125.00 A
N
for I
= 1 A 0.50 A to 25.00 A
N
for I
= 5 A 2.50 A to 125.00 A
N
>
0
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
>
2
0.003 A to 25.000 A
0.015 A to 125.000 A
0.1 VA to 10.0 VA
0.00 s to 30.00 s
See Figure 4-6
1 % of set value at sensitive earth current transformer
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
10 % to 45 %
Referred to fundamental wave
With I
(= 3 I
) and 3 U
and I
E
0
0
With I
(= 3 I
) and 3 U
and I
E
0
0
With I
(= 3 I
) and I
(transformer star-point current)
E
0
0
With I
and U
(negative sequence quantities)
2
2
With zero-sequence power
0.5 V to 10.0 V
0.5 V to 10.0 V
0° to 360°
0° to 360°
10 % of set value or 5 % of nominal
current or 0.5 V
5°
Approx. 30 ms
Increments 0.01 A
Increments 0.001 A
Increments 0.01 A
Increments 0.001 A
Increments 0.1 VA
Increments 0.01 s
Increments 1 %
Increments 0.01 A
odr I
and U
Y
2
2
Y
Increments 0.1V
Increments 0.01 A
Increments 0.01 A
Increments 0.1V
Increments 1°
Increments 1°
453
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