Technical Data
4.3 Inverse-Time Overcurrent Protection 51(N)
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
487
Tolerances
Influencing Variables for Pickup and Dropout
Pickup/dropout thresholds I
p
, I
Ep
2% of setting value or 10 mA for I
N
= 1 A, or 50 mA for I
N
= 5 A
Pickup time for 2 ≤ I/I
p
≤ 20 5 % of reference (calculated) value + 2 % current tolerance, respective-
ly 30 ms
Dropout time for I/Ip ≤ 0.90 5 % of reference (setpoint) value + 2 % or 30 ms
Power supply direct voltage in range 0.8 ≤ V
PS
/V
PSNom
≤ 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 0.95 ≤ f/f
Nom
≤ 1.05 1 %
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1%
1%
Transient overreaction during fundamental harmonic measuring procedure for τ > 100 ms
(with full displacement)
<5 %
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