Technical Data
4.2 Definite-Time Overcurrent Protection 50(N)
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
346
Influencing Variables for Pickup and Dropout
Auxiliary DC voltage in range 0.8 ≤ V
Aux
/V
AuxNom
≤ 1.15 1 %
Temperature in range –5 °C (41 °F) ≤ Θ
amb
≤ 55 °C (131 °F) 0.5 %/10 K
Frequency in range of 50 Hz to 70 Hz
Frequency in range 0.95 ≤ f/f
Nom
≤ 1.05 1 %
Frequency outside range 0.95 ≤ f/f
Nom
≤ 1.05 Increased tolerances
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
at instantaneous value of 50-3/50N-3 elements
1%
1%
Increased tolerances
Transient overreaction for τ > 100 ms (with full displacement) <5 %
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