Siemens 7SC80 - Inverse-Time Overcurrent Protection

Inverse-Time Overcurrent Protection
Operating Modes
Three-phase Standard
Two-phase Phases A and C
voltage-independent,
voltage-controlled,
voltage-dependent
Measuring Method
All elements First harmonic, rms value (true rms)
Setting Ranges / Increments
Pickup current 51 (phases)
for Ι
Nom
= 1 A
0.02 A to 4.00 A Increments
0.01 A
for Ι
Nom
= 5 A
0.10 A to 20.00 A
Pickup current 51-1, 51-2, 51-3,
51-4 (ground)
for Ι
Nom
= 1 A
0.02 A to 4.00 A or ∞ Increments
0.01 A
for Ι
Nom
= 5 A
0.10 A to 20.00 A or ∞
Pickup current 51N ground
for Ι
Nom
= 1 A
0.05 A to 4.00 A Increments
0.01 A
for Ι
Nom
= 5 A
0.25 A to 20.00 A
Pickup current 51N-1, 51N-2,
51N-3, 51N-4 (ground)
for Ι
Nom
= 1 A
0.05 A to 4.00 A or ∞ Increments
0.01 A
for Ι
Nom
= 5 A
0.25 A to 20.00 A or ∞
Time multiplier T for 51, 51N for IEC curves 0.05 s to 3.20 s or ∞ (disabled) Increments
0.01 s
Time multiplier D for 51, 51N for ANSI curves 0.50 s to 15.00 s or ∞ (disabled) Increments
0.01 s
Time multiplier for All Curves 0.01 s to 20.00 s or ∞ (disabled) Increments
0.01 s
Undervoltage threshold 51V V< for for release
of 51
10.0 V to 125.0 V Increments 0.1V
4.3
Technical Data
4.3 Inverse-Time Overcurrent Protection
SIPROTEC Compact, 7SC80, Manual 511
E50417-G1140-C486-A8, Edition 07.2017