Technical Data
4.9 Negative Sequence Protection (inverse-time characteristics)
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
381
Dropout Value
Tolerances
Influencing Variables for Pickup Values
The dropout time constants apply to (I
2
/I
2p
) ≤ 0.90
IEC and ANSI (without Disk Emulation) Approx. 1.05 · I
2p
setting value, which is approx. 0.95 · pickup
thresholdI
2
ANSI with Disk Emulation Approx. 0.90 · I
2p
setting value
Dropout value I
2p
Time for I
2
/I
2p
≤ 0.90
3 % of setting value or 15 mA for I
Nom
= 1 A
or 75 mA for I
Nom
= 5 A
5 % of reference (calculated) value +2 % current tolerance,
or 30 ms
Power Supply DC 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 Tolerances
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1%
1%
Transient overreaction for τ > 100 ms (with full displacement) <5 %
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