Siemens 7SC80 Manual page 551

Note: When using the sensitive transformer, the linear range of the measuring input for sensitive ground
fault detection is from 0.001 A to 1.6 A or 0.005 A to 8.0 A, depending on parameter 205 CT SECONDARY.
The function is however still preserved for larger currents.
Direction Determination for all Types of Ground Fault with cos ϕ / sin ϕ Measurement
Direction measurement
Measuring principle
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
Dropout ratio
Measurement method
Directional limit line PHI CORRECTION
Dropout delay RESET DELAY
Limitation of the directional areas using α1 and α2
Angle tolerance
Direction Determination for all Types of Ground Fault with V0 ϕ / I0 ϕ Measurement
Direction measurement
Measuring principle
50Ns-1 element
Minimum voltage 50Ns-1 Vmin
V0 measured
3V0 calculated
Phase angle 50Ns-1 Phi
Delta phase angle 50Ns-1 DeltaPhi
50Ns-2 element
Minimum voltage 50Ns-2 Vmin
V0 measured
3V0 calculated
Phase angle 50Ns-2 Phi
Delta phase angle 50Ns-2 DeltaPhi
Angle tolerance
1) For LPS devices, this parameter is recommented to be set ≥ 5 V.
Angle tolerance
Angle correction for cable converter in two operating points F1/I1 and F2/I2:
Angle correction F1, F2
(for resonant-grounded system)
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
4.15 Ground Fault Detection (Sensitive/Insensitive)
- Ι and V
N N
- 3Ι and 3V
0
Active/reactive power measurement
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
approx. 0.80
cos φ and sin φ
-45.0° to +45.0°
1 s to 60 s
1° to 15°
3°
- Ι and V
N N
- 3Ι and 3V
0
V0 / Ι0 phase angle measurement
0.4 V to 50 V
10 V to 90 V
- 180° tos 180°
0° bis 180°
0.4 V to 50 V
10 V to 90 V
- 180° to 180°
0° to 180°
3°
0.0° to 5.0°
Technical Data
measured
calculated
0
Increments 0.001 A
Increments 0.005 A
Increments 0.01 A
Increments 0.05 A
Increments 0.1°
Increments 1 s
Increments 1°
measured
calculated
0
Increments 0.1 V
1)
Increments 1 V
Increments 1°
Increments 1°
Increments 0.1 V
1)
Increments 1 V
Increments 1°
Increments 1°
Increments 0.1°
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