Inverse-Time Overcurrent Protection - Siemens 7SC80 Manual

4.3

Inverse-Time Overcurrent Protection

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