Negative Phase Sequence Overvoltage Protection - Siemens 7SC80 Manual

Technical Data

4.9 Negative Phase Sequence Overvoltage Protection

4.9 Negative Phase Sequence Overvoltage Protection
Setting Ranges / Increments
Overvoltages 47NPS-1 V2, 47NPS-2 V2
Measured quantity used
with 3-phase connection
Connection of phase-to-ground voltages:
- Evaluation of negative-sequence system
Connection of phase-to-phase voltages:
- Evaluation of negative-sequence system
Dropout ratio r for 47NPS-1, 47NPS-2
Dropout threshold for (r· 47NPS-1) or (r· 47NPS-2)
Time delay T 47NPS-1 V2, 47NPS-2 V2
phase-specific delay time Phx T 59-1
1) r = V /V
dropout pickup
Times
Pickup time overvoltage 47NPS-1 V2, 47NPS-2 V2
Dropout time overvoltage 47NPS-1 V2, 47NPS-2 V2
Tolerances
Voltage limit values
Delay times T
Influencing Variables for Pickup and Dropout Values
Auxiliary direct voltage in the range of 0.8 ≤ V
Temperature in the range of 23.00 °F (-5 °C) ≤ Θ
Frequency in the range of 25 Hz to 70 Hz
Frequency in the range of 0.95 ≤ f/f
Frequencies outside the range of 0.95 ≤ f/f
Harmonics
- up to 10 % 3. harmonic
- up to 10 % 5. harmonic
534
- negative-sequence voltages
2 V to 240 V
2 V to 240 V
0.90 to 0.99
1)
max. 240 V for phase-to-phase voltage
max. 240 V for phase-to-ground voltage
Minimum hysteresis 0.6 V
0.00 s to 100.00 s or
∞ (disabled)
/V ≤ 1.15
PS PSNom
≤ 131.00 °F (55 °C)
amb
≤ 1.05 (f = 50 Hz or 60 Hz)
Nom Nom
≤ 1.05
Nom
Increments 1 V
Increments 1 V
Increments 0.01
Increments 0.01 s
approx. 60 ms
approx. 60 ms
3 % of setting value or 1 V
1 % of setting value or 10 ms
1 %
0.5 %/10 K
1 %
increased tolerances
1 %
1 %
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017