Technical Data
4.3 Inverse-time Overcurrent Protection
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
368
Influencing Variables for Pickup and Dropout
Power supply direct voltage in range 0.8 ≤ V
Aux
/V
AuxNom
≤ 1.15 1 %
Temperature in range 23.00 °F (–5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) 0.5 %/10 K
Frequency in range of 25 Hz – 70 Hz
Frequency in range of 0.95 ≤ f/f
Nom
≤ 1.05 (f
Nom
= 50 Hz or 60 Hz) 1 %
Frequency in range 0.95 ≤ f/f
Nom
≤ 1.05 Increased Toler-
ances
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1%
1%
Transient overreaction during first harmonic measuring technique for τ > 100 ms (with full
displacement)
<5 %
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