Single-Phase Overcurrent Protection - Siemens 7SC80 Manual

4.7

Single-Phase Overcurrent Protection

Current Elements
High-set current elements
50-2
T
50-2
Definite time current
element 50-1
T
50-1
Operating Times
Pickup/Dropout Times
Frequency Pickup Time
minimum
maximum
Dropout time approx.
Dropout Ratios
Current Elements
Tolerances
Currents
Times
Influencing Variables for Pickup Values
Auxiliary DC voltage in range 0.8 ≤ V
Temperature in range –5 °C (23 °F) ≤ Θ
Frequency in the range of 25 Hz to 70 Hz
Frequency in the range of 0.95 ≤ f/f
Frequency outside range 0.95 ≤ f/f
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
for Ι = 1 A 0.001 A to 1.6 A or ∞ (element disabled) Increments 0.001 A
Nom
= 5 A 0.005 A to 8 A or ∞ (element disabled)
for Ι
Nom
0.00 s to 60.00 s or ∞ (no trip)
for Ι = 1 A 0.001 A to 1.6 A or ∞ (element disabled) Increments 0.001 A
Nom
for Ι = 5 A 0.005 A to 8 A or ∞ (element disabled)
Nom
0.00 s to 60.00 s or ∞ (no trip)
50 Hz 60 Hz
14 ms 13 ms
≤ 35 ms ≤ 35 ms
25 ms 22 ms
approx 0.95 for Ι/Ι
Nom
5 % of setting value or 1 mA
1 % of setting value or 10 ms
/V ≤ 1.15
Aux AuxNom
≤ 55 °C (131 °F)
amb
≤ 1.05 (f = 50 Hz or 60 Hz)
Nom Nom
≤ 1.05
Nom
4.7 Single-Phase Overcurrent Protection
≥ 0.5
1 %
0.5 %/10 K
1 %
Increased tolerances
1 %
1 %
Technical Data
Increments 0.01 s
Increments 0.01 s
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