Technical Data
4.15 Ground Fault Detection (Sensitive/Insensitive)
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
393
Direction Determination for all Types of Ground Fault with cos ϕ / sin ϕ Measurement
Direction Determination for all Types of Ground Fault with V0 ϕ / I0 ϕ Measurement
Direction measurement - I
N
and V
N
measured
- 3I
0
and 3V
0
calculated
Measuring principle Active/reactive power measurement
Measuring release RELEASE DIRECT.
(current component perpendicular (90º) to directional
limit line)
for sensitive 1 A transformer
for sensitive 5 A transformer
for normal 1 A transformer
for normal 5-A transformer
0.001 A to 1.600 A
0.005 A to 8.000 A
0.05 A to 35.00 A
0.25 A to 175.00 A
Increments
0.001 A
Increments
0.005 A Incre-
ments 0.01 A
Increments
0.05 A
Dropout ratio Approx. 0.80
Measurement method cos ϕ and sin ϕ
Directional limit line PHI CORRECTION -45.0° to +45.0° Increments 0.1°
Dropout delay RESET DELAY 1 s to 60 s Increments 1 s
Limitation of the directional areas using α1 and α2 1° to 15° Increments 1°
Angle tolerance 3°
Direction measurement - I
N
and V
N
measured
- 3I
0
and 3V
0
calculated
Measuring principle U0 / I0 phase angle measurement
50Ns-1 element
Minimum voltage 50Ns-1 Vmin
V0 measured
3V0 calculated
0.4 V to 50 V
10 V to 90 V
Increments 0.1 V
Increments 1 V
Phase angle 50Ns-1 Phi - 180° to 180° Increments 1°
Delta phase angle 50Ns-1 DeltaPhi 0° to 180° Increments 1°
50Ns-2 element
Minimum voltage 50Ns-2 Vmin
V0 measured
3V0 calculated
0.4 V to 50 V
10 V to 90 V
Increments 0.1 V
Increments 1 V
Phase angle 50Ns-2 Phi - 180° to 180° Increments 1°
Delta phase angle 50Ns-2 DeltaPhi 0° to 180° Increments 1°
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